Diana Changeset - a81abb4e0968

Changeset - a81abb4e0968

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0 3 1

Laman - 9 years ago 2016-09-10 12:45:35

fixed sgfParser, added complex sgf test

4 files changed with 67824 insertions and 14 deletions:

src/diana/diana.py

src/diana/sgfParser.py

src/diana/tests/data/kogos.sgf

67789

src/diana/tests/sgfParser.py

0 comments (0 inline, 0 general)

src/diana/diana.py

➞

Show inline comments

@@ @@ -2,8 +2,8 @@ @@
 import re
 import sys
 import diana.sgf as sgf
 import diana.go as go
 import sgf
 import go
 if len(sys.argv)>1:
 	files=sys.argv[1:]

src/diana/sgfParser.py

➞

Show inline comments

@@ @@ -6,8 +6,6 @@ def skipWhitespace(str,start): @@
 	return i
 class Collection:
 	gameTrees=[]
 	def __init__(self,str):
 		self.gameTrees=[]
 		i,x=GameTree.create(str,0)
@@ @@ -19,8 +17,9 @@ class Collection: @@
 			i,x=GameTree.create(str,i)
 class GameTree:
 	nodes=[]
 	branches=[]
 	def __init__(self):
 		self.nodes=[]
 		self.branches=[]
 	# def __init__(self,str,start):
 		# self.nodes=[]
@@ @@ -40,6 +39,7 @@ class GameTree: @@
 			# return (-1,None)
 		# return (i+1,self)
 	@staticmethod
 	def create(str,start):
 		res=GameTree()
 		i=skipWhitespace(str,start)
@@ @@ -66,8 +66,10 @@ class GameTree: @@
 		return (i+1,res)
 class Node:
 	properties=dict()
 	def __init__(self):
 		self.properties=dict()
 	@staticmethod
 	def create(str,start):
 		res=Node()
 		if str[start]!=";":
@@ @@ -77,7 +79,8 @@ class Node: @@
 		i,x=Property.create(str,start+1)
 		while x is not None:
 			if x.name in res.properties:
 				print('error: duplicate "{0}" property in node at position {1}. second value ignored'.format(x.name,start))
 				print(res.properties)
 				raise ParserError(0,0,'duplicate "{0}" property in node at position {1}. second value ignored'.format(x.name,start))
 			else:
 				res.properties[x.name]=x
 			i=skipWhitespace(str,i)
@@ @@ -93,9 +96,11 @@ class Node: @@
 		else: return None
 class Property:
 	name=""
 	value=""
 	def __init__(self):
 		self.name=""
 		self.value=""
 	@staticmethod
 	def create(str,start):
 		res=Property()
 		i,x=Property.ident(str,start)
@@ @@ -112,6 +117,7 @@ class Property: @@
 			# i,x=PropValue.create(str,i,res.name)
 		return (i,res)
 	@staticmethod
 	def ident(str,start):
 		r=re.compile(r"[A-Z]+")
 		m=r.match(str,start)
@@ @@ -119,10 +125,13 @@ class Property: @@
 		return (m.end(),m.group())
 class PropValue:
 	type=""
 	value=None
 	def __init__(self):
 		self.type=""
 		self.value=None
 	patterns=dict()
 	@staticmethod
 	def create(str,start,name):
 		if name in PropValue.patterns:
 			return PropValue.patterns[name](str,start)
@@ @@ -171,7 +180,7 @@ class PropValue: @@
 	def listOf(vType,allowEmpty=False):
 		def f(str,start):
 			res=[]
 			single=singleton(vType)
+			single=PropValue.singleton(vType)
 			i,x=single(str,start)
 			while x!=None:
 				res.append(x)
@@ @@ -363,6 +372,14 @@ class PropValue: @@
 		"TW":listOf(point,allowEmpty=True)
+	}
 class ParserError(Exception):
 	def __init__(self,line,col,message):
 		self.line=line
 		self.col=col
 		self.message=message
 """def property(str):
 	# i=propIdent(str)
 	# if i<0: return -1

src/diana/tests/data/kogos.sgf

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Show inline comments

@@ new file 100644 @@
 (;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
 RU[Japanese]SZ[19]KM[0.00]
 GN[Kogo's Joseki Dictionary]DT[25.02.2014]CP[see below]GC[Commercial distribution without permission and a link to the KJD web page is a copyright violation. Please ask for permission prior to distribution.
 Contact: kogo@waterfire.us.
 Updates available at: http://waterfire.us/joseki.htm.
 Copyright 1998-2014 by Gary Odom.
 Contributions 2010-2013 by Alexandre Dinerchtein.
 Contributions 2006-2007 by Andre Ay.
 Contributions 2000-2001 by Stefan Verstraeten.
 ]EV[]PC[]SO[]LB[nc:F][oc:D][qc:A][nd:G][od:E][pd:C][qd:B][oe:H][qj:I]C[
 Kogo's Joseki Dictionary
 -------------------------------------------------
 Variation 1: 3-3 Point = San-san = Sam-sam = San-san
 Variation 2: 3-4 Point = Komoku = Somok = Xiao~mu`
 Variation 3: 4-4 Point = Hoshi = Hwajeom, Seongjeom = Xingwei`
 Variation 4: 5-3 Point = Mokuhazushi = Waemok = Wai`mu`
 Variation 5: 5-4 Point = Takamoku = Gomok = Gaomu`
 Variation 6: 6-3 Point = Oomokuhazushi
 Variation 7: 6-4 Point = Ootakamoku = Chaogao
 Variation 8: 5-5 Point = Go-no-go = Wu~wu~
 Variation 9: Reducing against 10-3
 A joseki is a variation that gives an equitable result for both players. In other words, a joseki is fair to both players. A player should of course prefer a variation that gives a favorable result, but be satisfied with joseki in the context of whole-board strategy.
 Choosing a joseki:
 Since josekis work effectively in a certain direction, examine positions at adjacent corners and sides before choosing a joseki.
 The opposite corner matters only if a ladder is involved. Some guidelines:
 . Have support for a fight. A high position provides support; a low position does not.
 . Take the side with most value.
 a. A juncture point for both sides is of great value.
 b. A side where making territory is uncertain is of little value.
 . Consider strategic balance.
 . Get sente if there are more big points on the board.
 . If there are two variations with similar outcome, but one with a ladder and one without, avoid the ladder, because you don't need to risk an opponent's ladder breaker.
 How to learn joseki:
 If you don't know joseki or a specific joseki, which you want to learn, don't try to remember every single variation you find here. Look first at the joseki. Then try to remember the easiest variations. When you learn a joseki, look also for the follow-ups in the middle and end game.
 If something goes wrong or you want to know more, look up variations, special strategies, trick plays and mistakes. To understand why variations are only for special situations, or are always mistakes, compare their results with the results of joseki (instead of looking at their results in isolation).
 Open this file twice to put two results beside each other on your screen.
 -----------------------------------------------------------------------------------------------
 Mistakes:
 If you find a mistake in KJD content, please email kogo@waterfire.us.
 ]VW[]
 (;B[qc]LB[nc:e][oc:b][pc:f][nd:c][od:d][pd:a]C[
 -3 Point = San-San = Sam-Sam = San-San
 ---------------------------------------------
 The san-san (3-3) point, emphasizing territory at the expense
 of influence (especially following an approach at 'a').
 All joseki for the 3-3 point are relatively simple.
 White approaches are 'a' to 'c'. White 'b' to 'e' are played
 when the top side is favored (such as an extension).
+]
 (;W[pd]LB[ob:c][oc:b][qd:a]C[
 Kata-tsuki (shoulder hit)
 --------------------------
 The shoulder-hit is the traditional answer to the 3-3.
 The direction of Black 3 depends on the positions on the side.
 Crawling once may be the premise for a follow-up move of sliding with a knight's move in the opposite direction. If Black plays 3 at 'a' (to the right), the follow-on knight's move is then played at the top. Black's knight's move reduces territory potential on the side it is played.
 Given a White stone at top, White 2 would be a mistake. In such a case, White should have played an extension from that stone, rather than White 2.
 Black joseki continues with 'a'. Black 'b' and 'c' (both very rare) show a special strategy.
 For variations of Black playing elsewhere, see 4-4 point (Hoshi) variations.
+]
 (;B[qd]LB[pc:c][pe:a][pf:b]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[pe]LB[ob:a][nc:f][oc:e][pc:b][qe:d][qf:c][dp:g]C[Black continues with 'a', 'b' or 'c'. Black 'd' is seen occasionally in amateur games.
 Black 'a' and 'b' favor the top, while Black 'c' (and 'd') emphasize the right side (to the potential sacrifice of giving White thickness at the top).
 Black 'e' and 'f' are not recommended.
 Black 'g' shows Black playing elsewhere.
 g7, f6, e5, d4, c3, b2, a1]
 (;B[ob]LB[nc:c][md:a][qe:b][pj:d][dp:e]TR[qj]C[White continues with 'a' or 'b'.
 If there is already a Black stone on the marked position, 'b' is wrong, and White must play 'a'. If there is already a White stone, 'a' is wrong. White must play 'b'.
 White 'c' is a mistake, as White's stones are disconnected.
 White 'd' shows a special strategy.
 White 'e' shows White playing elsewhere.]
 (;W[md]LB[nd:b][qf:c][rf:a][dp:d]C[
 niken-tobi (1-space jump)
 -------------------------
 Black continues with 'a' to 'c'. Black 'b' and 'c' are played
 if Black wants to emphasize the top.
 Black may also play elsewhere ('d').]
 (;B[rf]
 ;W[ph]C[
 * Joseki *
 But this variation is not popular anymore, as professionals think that Black gets a favorable result.])
 (;B[nd]
 ;W[ne]
 ;B[nc]
 ;W[me]
 ;B[lc]
 ;W[qe])
 (;B[qf]LB[qe:a][og:b]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[re]
 ;W[rf]
 ;B[rg]
 ;W[pf]
 ;B[qg]
 ;W[pc]
 ;B[pb]
 ;W[rd]
 ;B[sf]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[nb]
 ;B[nc]
 ;W[mb]
 ;B[oc]
 ;W[nd])
 (;W[og]LB[qg:a][dp:b]C[Black continues with 'a', or plays elsewhere.]
 (;B[qg])
 (;B[]C[Black plays elsewhere.]
 ;W[qg]
 ;B[rf])))
 (;B[]C[Black plays elsewhere.]
 ;W[qe]LB[nc:b][nd:a][dp:c]C[Black continues locally with 'a' or 'b'. Black may also play elsewhere ('c').]
 (;B[nd]
 ;W[ne]
 ;B[nc]
 ;W[mf]
 ;B[le]
 ;W[me]
 ;B[lc]
 ;W[ld]
 ;B[kc])
 (;B[nc]
 ;W[nd]
 ;B[lc])
 (;B[]LB[mb:b][nc:a]C[Black plays elsewhere.
 White continues with 'a' or 'b'.]
 (;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[oc]
 ;W[od]
 ;B[]C[Black plays elsewhere.]
 ;W[re]
 ;B[rb])
 (;W[mb]
 ;B[re]
 ;W[rf]
 ;B[rd]))))
 (;W[qe]LB[nd:a][pi:b][dp:c]C[White emphasizes the top with 6.
 Black continues with 'a' or 'b'.
 'c' shows continuation when Black plays elsewhere.]
 (;B[nd]LB[nc:b][ne:c][qi:a]C[Black 7 is absolutely necessary.
 White continues with 'a'. White 'b', an amateur innovation, is a trick play. White 'c' is also possible.]
 (;W[qi]C[
 * Joseki *])
 (;W[nc]C[White 8 is a trick play.]
 ;B[oc]
 ;W[mc]
 ;B[od]
 ;W[qi]C[Now Black may harass the two White stones, or play elsewhere.])
 (;W[ne]
 ;B[me]LB[mf:a][nf:b]C[White continues with 'a' or 'b'.]
 (;W[mf]LB[le:a][nf:b]C[Black continues with 'a' or 'b'.]
 (;B[le]
 ;W[ng])
 (;B[nf]
 ;W[ng]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[mg]
 ;W[lf]
 ;B[mh]
 ;W[le]
 ;B[nc]
 ;W[pj]
 ;B[kh]))
 (;W[nf]
 ;B[ld])))
 (;B[pi]LB[md:a][qk:b]C[White continues with 'a', possibly 'b'.]
 (;W[md])
 (;W[qk]C[White 8 works with support in the lower right corner.]
 ;B[nd]
 ;W[pg]
 ;B[pk]
 ;W[qj]
 ;B[pj]
 ;W[qi]
 ;B[pl]))
 (;B[]C[Black plays elsewhere.]
 ;W[nc]
 ;B[oc]
 ;W[ne]
 ;B[nd]))
 (;W[nc]C[White 6 is a mistake.]
 ;B[qe]LB[qf:a][pg:b]C[White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pf]C[Black 9 works however White decides to continue owing to White
 lacking sufficient connection to White 2,4.]
 ;W[qg]C[A likely continuation by White.]
 ;B[oc]
 ;W[nd]
 ;B[od]LB[oe:b][of:a]C[White may try 'a' or 'b'.]
 (;W[of]
 ;B[oe]LB[ne:b][pg:a]C['a' and 'b' are miai. Black has a large corner and is out in the center, while White has splintered groups.])
 (;W[oe]
 ;B[ne]LB[nf:a][of:b]C[Black must cut at 15. White may try 'a' or 'b'. Either way, Black takes the two White stones at top or White suffers for trying
 to save them.]
 (;W[nf]
 ;B[me]
 ;W[of]
 ;B[mc])
 (;W[of]
 ;B[me]LB[lc:a][ld:b]C[White may try 'a' or 'b' to save the two top stones. Both leave White at a loss.]
 (;W[lc]
 ;B[ld]LB[mb:b][kc:c][mc:a]C[Black's aim is 'a'. White continues with 'a' or 'b'. White 'c' does not work.]
 (;W[mc]
 ;B[kc]
 ;W[kd]
 ;B[ke]
 ;W[kb]
 ;B[jd]
 ;W[jc]
 ;B[kd]
 ;W[ic])
 (;W[mb]LB[kc:c][mc:a][kd:b]C[Black continues with 'a' to 'c'.]
 (;B[mc]
 ;W[nb]
 ;B[kc]
 ;W[md]
 ;B[ke]
 ;W[kb]
 ;B[jc])
 (;B[kd]
 ;W[kc]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[ib]
 ;B[hc])
 (;B[kc]
 ;W[kd]
 ;B[mc]
 ;W[md]
 ;B[le]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[nb]
 ;W[mc]
 ;B[ma]
 ;W[lb]
 ;B[ic]))
 (;W[kc]C[White 20 is a mistake, leading to a snapback capture.]
 ;B[mc]
 ;W[mb]
 ;B[nb]
 ;W[md]
 ;B[mc]))
 (;W[ld]
 ;B[md]
 ;W[mc]
 ;B[lc]C[White cannot save the three stones.]))))
 (;W[pg]C[ikken tobi (1-space jump)]
 ;B[qf]))
 (;W[pj]LB[qe:a][qf:b]C[White 6 puts emphasis on the lower right.
 Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[pf]
 ;B[qf]
 ;W[pg])
 (;B[qf]
 ;W[pf]
 ;B[qg]
 ;W[pg]
 ;B[ph]
 ;W[qe]
 ;B[re]
 ;W[qh]
 ;B[oh]
 ;W[pc]
 ;B[pb]
 ;W[rd]
 ;B[rf]
 ;W[rc]
 ;B[qb]
 ;W[qi]
 ;B[rh]
 ;W[me]))
 (;W[]C[White plays elsewhere.]
 ;B[nd]
 ;W[ph]
 ;B[pj]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[nf]
 ;W[ng]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[nj]
 ;B[om]
 ;W[mg]
 ;B[ke]))
 (;B[pc]LB[oc:c][md:d][nd:a][qe:b]C[Kitani Minoru invariably played this way. Black 5 is thicker than the knight's move, but White also gets good shape. 'a' is joseki, 'b' and 'c' are not. White 'd' is an overplay.]
 (;W[nd]
 ;B[oc]LB[nc:b][le:c][me:d][ne:e][mf:a]C[White continues with 'a', 'c' or 'd'. White 'b' is unreasonable
 without the preparation move at 'c'. White 'e' avoids probes, but is not efficient shape.]
 (;W[mf]LB[mc:a][qf:b]C[Black continues with 'a' or 'b'.]
 (;B[mc]LB[qe:a][dp:b]C[White continues with 'a'. Variation 'b' shows White playing
 elsewhere.]
 (;W[qe]C[
 * Joseki *])
 (;W[]C[White plays elsewhere.]
 ;B[md]LB[jd:b][me:a]C[White plays 'a' to emphasize influence and get sente. With White 'b', White sacrifices for influence.]
 (;W[me]
 ;B[kd])
 (;W[jd]C[White is prepared to sacrifice for influence.]
 ;B[nf]
 ;W[ng]
 ;B[of]
 ;W[me]
 ;B[ne]
 ;W[og]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[ke])))
 (;B[qf]LB[nc:a][dp:b]C[White continues with 'a'. 'b' shows White playing elsewhere.]
 (;W[nc]C[
 * Joseki *])
 (;W[]C[White plays elsewhere.]
 ;B[pf]LB[nc:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[nc])
 (;W[of]
 ;B[og]
 ;W[nf]
 ;B[ph]))))
 (;W[nc]C[White 8 is unreasonable.]
 ;B[od]
 ;W[oe]
 ;B[ne]C[White is cut in two. Black has a secure corner and better prospects
 in the fight ahead.])
 (;W[le]LB[nc:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[nc])
 (;B[nc]LB[md:c][qe:a][nf:b]C[White continues with 'a' to 'c'.]
 (;W[qe]
 ;B[md]
 ;W[me]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[nf])
 (;W[nf]
 ;B[qf]
 ;W[lc]
 ;B[od]
 ;W[oe]
 ;B[md]
 ;W[ld]
 ;B[ne]
 ;W[me])
 (;W[md]
 ;B[nf]
 ;W[ne]
 ;B[qf])))
 (;W[me]
 ;B[nf]
 ;W[ne]
 ;B[qf])
 (;W[ne]C[White 'e' avoids probing moves by Black, but is not otherwise efficient shape.]
 ;B[qf]))
 (;W[qe]
 ;B[od]
 ;W[oe]
 ;B[nd]
 ;W[qi]
 ;B[jc])
 (;W[oc]LB[ob:b][nc:a][od:d][qf:c]C[White 6 is not recommended.
 Black continues with 'a'. Black 'b' is submissive.
 Black 'c' or 'd' are playable if Black wants the right side (and abandon the top).]
 (;B[nc]
 ;W[ob]
 ;B[od]LB[nb:b][nd:a]C[White plays 'a' if the ladder to capture Black 9 is unfavorable, and 'b' if the ladder is favorable.]
 (;W[nd]C[White plays this way when the ladder is unfavorable.]
 ;B[oe]LB[mc:a][pf:b]C[White continues with 'a'. White 'b' is something of a trick play; a ladder is involved.]
 (;W[mc]
 ;B[ne]
 ;W[md]
 ;B[pf])
 (;W[pf]LB[nb:b][ne:a]C[Black plays 'a' if the Black stones can be caught in a ladder, or can play 'b' if not.]
 (;B[ne]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[jb]
 ;B[kb]
 ;W[ka]
 ;B[jc]
 ;W[ib]
 ;B[pb]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[sd])
 (;B[nb]C[Black must have the ladder to play this way.]
 ;W[of]
 ;B[ne]LB[md:a][nf:b]C[White 'a' and 'b' are the unpleasant alternatives.]
 (;W[md]
 ;B[mf])
 (;W[nf]
 ;B[me]))))
 (;W[nb]C[White plays this way when the ladder is favorable.]
 ;B[mc]LB[mb:b][nd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[oe]
 ;W[md]LB[mb:b][pf:a]C[Black continues with 'a'. Black 'b' gives White superior thickness.]
 (;B[pf]
 ;W[lc])
 (;B[mb]C[Black 15 is not recommended.]
 ;W[lc]
 ;B[lb]
 ;W[kb]
 ;B[kc]
 ;W[ld]
 ;B[jb]
 ;W[of]
 ;B[ne]
 ;W[ka]
 ;B[ja]
 ;W[kd]
 ;B[pb]
 ;W[nf]
 ;B[me]
 ;W[lf]
 ;B[pf]
 ;W[qe]
 ;B[oa]
 ;W[mf]
 ;B[na]
 ;W[le]
 ;B[oc]
 ;W[pg]
 ;B[jc]
 ;W[qf]))
 (;W[mb]C[White 12 is a mistake.]
 ;B[lc]LB[lb:a][qe:b]C[White continues with 'a'. White 'b' compounds the mistake.]
 (;W[lb]
 ;B[qe]LB[kc:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[kc]
 ;B[me])
 (;W[pf]
 ;B[nd]
 ;W[kc]
 ;B[qf]
 ;W[nf]
 ;B[kd]
 ;W[jd]
 ;B[ke]
 ;W[je]
 ;B[kf]
 ;W[oh]
 ;B[jf]
 ;W[qg]
 ;B[rg]
 ;W[qh]))
 (;W[qe]C[White 14 is a mistake.]
 ;B[lb]C[White's four stones are lost.]))))
 (;B[ob]C[Black 7, crawling along the second line, is weak.]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[qf]
 ;W[og]
 ;B[qg])
 (;B[qf]
 ;W[ob]LB[pf:b][qg:a]C[Black plays simply with 'a', or pushes with 'b'.]
 (;B[qg]
 ;W[ne])
 (;B[pf]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[ng]
 ;W[mf]
 ;B[qe]
 ;W[mg]))
 (;B[od]
 ;W[nc]LB[nd:b][qf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]
 ;W[pf]
 ;B[pg]LB[ne:a][qe:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ne]
 ;B[qe])
 (;W[qe]C[White 12 is a fatal mistake.]
 ;B[re]
 ;W[rf]
 ;B[qg]
 ;W[rd]
 ;B[se]
 ;W[sd]
 ;B[of]
 ;W[sf]
 ;B[re]
 ;W[se]
 ;B[oe]
 ;W[re]
 ;B[rc]
 ;W[rh]
 ;B[rg]
 ;W[sg]
 ;B[sc]
 ;W[sh]
 ;B[qi]
 ;W[ri]
 ;B[rj]))
 (;B[nd]C[Black 9 is not recommended.]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[pf]
 ;W[oe]
 ;B[qe]
 ;W[of]
 ;B[ld]
 ;W[kd]
 ;B[lf]
 ;W[ke]
 ;B[mg]
 ;W[pg]
 ;B[qf]
 ;W[oh])))
 (;W[md]LB[mb:b][qf:a]C[White 6 is an overplay. Depending on the side of value, Black continues with 'a' or 'b' locally, or plays elsewhere.]))
 (;B[qf]LB[pc:a][qe:b][og:c][dp:d]C[White continues with 'a', possibly 'b'. White 'c' is premature.
 White 'd' shows continuation if White plays elsewhere.]
 (;W[pc]LB[qb:d][qe:a][pf:b][qg:c]C[Black possibilities are 'a' to 'd'. Black 'a' is solid, and recommended.
 Black 'b' provokes White 'a', a rather unnecessary provocation.
 Black 'c' has no advantage over 'a'. Black 'd' is recommended only if the right side has no promise for Black, and 'd' could be sente (because the top has value).]
 (;B[qe]
 ;W[kc]LB[og:a][pj:b][qj:c]C[Black may play elsewhere, or locally at 'a', or around 'b' or 'c'.]
 (;B[og]C[Black 9 is one local possibility, depending on support in the lower right.])
 (;B[pj]C[Black 9 is high, a nice extension from Black 5, but a bit thin.])
 (;B[qj]C[Black 9 is low, but may make sense strategically.]))
 (;B[pf]LB[qe:a][of:b]C[Black 7 provokes White to cut.
 White continues with 'a', or shows restraint with 'b', depending on support towards the top-left.]
 (;W[qe]
 ;B[re]LB[rd:a][rf:b]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[sd]LB[of:a][rg:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[of]
 ;B[rg])
 (;W[rg]C[White 14 is unreasonable.]
 ;B[of]
 ;W[md]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]))
 (;W[rf]
 ;B[rd]
 ;W[rg]
 ;B[pb]
 ;W[ob]
 ;B[qb]LB[nc:b][oc:a][nd:c][of:d]C[White 'a' is solid. White 'b' and 'c' are also possible. White 'd', threatening to capture the two Black stones, is an overplay.]
 (;W[oc]LB[of:a][og:b]C[Black runs with 'a' or 'b'.])
 (;W[nc]LB[of:a][og:b]C[Black runs with 'a' or 'b'.])
 (;W[nd]LB[of:a][og:b]C[Black runs with 'a' or 'b'.])
 (;W[of]C[White 16 is unreasonable.]
 ;B[nb]LB[oa:b][oc:a]C[White continues with 'a'. White 'b' only compounds the mistake.]
 (;W[oc]
 ;B[oa])
 (;W[oa]C[White 18 is a mistake.]
 ;B[oc]LB[nc:a][od:b]C[Neither White 'a' nor 'b' work.]
 (;W[nc]
 ;B[od]
 ;W[oe]
 ;B[nd])
 (;W[od]
 ;B[nc])))))
 (;W[of]C[White 8 may be a reasonable strategy if White has support at top, but otherwise the outcome favors Black.]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[nf]
 ;B[qe]))
 (;B[qg])
 (;B[qb]
 ;W[pf]
 ;B[qg]))
 (;W[qe]
 ;B[re]LB[pc:a][rd:c][rf:b]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[pc]LB[qb:a][qg:c][rg:b]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[qb]
 ;W[og]LB[qg:a][qh:b]C[White later aims at 'a'. Black may play 'a' or 'b' to forestall
 this, or play elsewhere.]
 ;B[qg]
 ;W[ld])
 (;B[rg]
 ;W[pf]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[jd])
 (;B[qg]C[Black 9 leaves undesirable aji.]
 ;W[rf]
 ;B[rd]
 ;W[kc]))
 (;W[rf]C[White 8 is a mistake.]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]LB[pb:b][sb:a]C[White continues with 'a'. White 'b' is a mistake, as it puts unnecessary pressure on the three White outside stones.]
 (;W[sb]
 ;B[pb]
 ;W[ra]
 ;B[sd])
 (;W[pb]C[White 16 is a mistake, as crawling along the second line usually is.]
 ;B[oc]
 ;W[sb]
 ;B[sd]
 ;W[ra]
 ;B[nd]))
 (;W[rd]C[White 8 is a mistake.]
 ;B[rf]LB[pc:a][rc:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[pc]
 ;B[rc])
 (;W[rc]C[White 10 is a mistake.]
 ;B[pb]
 ;W[pc]
 ;B[qb]
 ;W[ob]
 ;B[rb])))
 (;W[og]C[White 6 is too loose, as White is left open at the top.]
 ;B[qg]
 ;W[pc]
 ;B[nd]C[Black 9 spoils White's attempt at thickness.])
 (;W[]C[White plays elsewhere.]
 ;B[pf]
 ;W[md]
 ;B[pc]))
 (;B[qe]LB[pc:a][pf:b][pg:c]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[pc]LB[pb:a][pf:b]C[Black continues with 'a' or 'b'.]
 (;B[pb]
 ;W[ob]
 ;B[qb]
 ;W[pf])
 (;B[pf]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[qg]LB[kd:b][ld:a]C[Next, White extends to 'a' or 'b'.]))
 (;W[pf]LB[oc:B][pc:A]C['a' is joseki and emphasizes the right side. 'b' is inferior and emphasizes the top.]
 (;B[pc]LB[oc:b][nd:a]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[oc]
 ;W[mf])
 (;W[oc]LB[ob:B][qg:A]
 (;B[qg]
 ;W[nd])
 (;B[ob]C[Black 9 is not recommended.]
 ;W[nc]
 ;B[nb]
 ;W[lc]
 ;B[qg]
 ;W[oh]
 ;B[qh]C[Black 15 avoids weakness at the marked intrusion point.]MA[qf])))
 (;B[oc]
 ;W[qf]LB[mc:B][nc:A]C[Only 'a' is possible now, 'b' as an example for all extensions wider than 'a' is wrong.]
 (;B[nc]LB[pb:B][qb:C][oc:7][pc:A]C[To eliminate the possibility of White 'a', Black 'b', White 'c', Black must play this very slow move and ends in gote. So Black 7 was not joseki.]
 ;W[pj]
 ;B[jd])
 (;B[mc]
 ;W[pj]LB[jd:A][dp:B]C[Black must play an extension on 'a', tenuki 'b' gives White a
 group on the top.]
 (;B[jd]LB[mc:9][jd:A][dp:B]C[Still, Black 9 was wrong, so White cuts or gets a ladder break.]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[nc]
 ;B[od]
 ;W[nd]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[og]C[Ladder.])
 (;B[dp]
 ;W[kc]LB[nc:A][cm:B]C[Black should defend on'a', tenuki on 'b' is wrong.]
 (;B[nc]
 ;W[hc])
 (;B[cm]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[nc]
 ;B[od]
 ;W[nd]
 ;B[oe]
 ;W[mb])))))
 (;W[pg]C[White 6 is not recommended.]
 ;B[pf]
 ;W[of]
 ;B[qf]
 ;W[og]LB[nd:a][oe:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nd]
 ;W[ne]
 ;B[pc]
 ;W[md]
 ;B[me])
 (;B[oe]
 ;W[ne]
 ;B[od]
 ;W[nd]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[qg])))
 (;B[oc]LB[pc:a][qe:b]C[Black 5 is not recommended.
 White continues with 'a', possibly 'b'.]
 (;W[pc]
 ;B[pb]LB[qb:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[nb]
 ;W[qi])
 (;W[qb]LB[ob:a][rb:b]C[Black continues with 'a', or, if the ladder for White to capture Black 5 is unfavorable, possibly 'b'.]
 (;B[ob]
 ;W[rb]
 ;B[qe]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[rc]
 ;B[sd]
 ;W[qh]
 ;B[rh]
 ;W[nd]
 ;B[mc]LB[qi:a][ri:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[qi]
 ;B[ri]
 ;W[qj])
 (;W[ri]C[White 22 is an overplay that leads White to doom if Black plays properly.]
 ;B[qi]
 ;W[rj]
 ;B[pf]
 ;W[of]
 ;B[pg]
 ;W[ph]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[pi]
 ;B[od]
 ;W[oe]
 ;B[nf]
 ;W[ne]
 ;B[mf]
 ;W[me]
 ;B[le]
 ;W[lf]
 ;B[mg]
 ;W[ld]
 ;B[ke]
 ;W[md]
 ;B[kd]
 ;W[lc]
 ;B[pj]
 ;W[oi]
 ;B[nh]
 ;W[qj]
 ;B[kc]
 ;W[lb]
 ;B[mb]
 ;W[kb]
 ;B[jb]))
 (;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[nc])))
 (;W[qe]C[Forcing first at the marked location is generally recommended, but White 6 as shown is also playable.]MA[pc]
 ;B[pc]
 ;W[ne]
 ;B[md]
 ;W[pi]))
 (;B[nc]LB[ob:b][pc:a][qe:c]C[Black 5 is not recommended.
 White continues with 'a' to 'c'.]
 (;W[pc]
 ;B[pb]LB[ob:a][qe:b]C[White continues with 'a' or 'b', depending upon the side of interest.]
 (;W[ob]
 ;B[qb]
 ;W[oc]
 ;B[qf]
 ;W[nd])
 (;W[qe]
 ;B[ob]
 ;W[qi]))
 (;W[ob]LB[qb:a][pc:c][qe:b]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[qb]
 ;W[oc]
 ;B[qf]
 ;W[nd])
 (;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[qb]
 ;B[qf]
 ;W[pc]
 ;B[pg])
 (;B[pc]C[Black 7 is the obvious blunt move, but is not recommended. Black secures good outside influence, but at considerable sacrifice in the corner.]
 ;W[oc]
 ;B[od]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[oe]
 ;W[qe]
 ;B[lc]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[of]
 ;W[pb]
 ;B[qg]))
 (;W[qe]C[Pushing first at the marked location before playing White 6 is recommended.]MA[pc]
 ;B[pc]
 ;W[qi]))
 (;B[]LB[pc:a][qe:b]C[Black plays elsewhere.
 White continues with 'a' or 'b'.]
 (;W[pc]LB[qe:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf])
 (;B[qe]
 ;W[qf]
 ;B[rf]
 ;W[qb]
 ;B[qg]
 ;W[pf]
 ;B[rd]))
 (;W[qe]
 ;B[ob])))
 (;W[pf]LB[ob:e][nc:d][od:a][pe:b][qe:c][dp:f]C[Black joseki continues with 'a' or 'b'. Other continuations show (at best) a special strategy.
 'f' shows Black playing elsewhere.]
 (;B[od]LB[oe:a][nf:b]C[White continues with 'a', possibly 'b'.]
 (;W[oe]LB[oc:b][pc:a]C[Black continues with 'a', or 'b' to take sente.]
 (;B[pc]
 ;W[nd]
 ;B[pe]LB[oc:c][qe:b][nf:a]C[White continues with 'a'. White 'b' or 'c' are overplays that start a fight where White is split disadvantageously.]
 (;W[nf]LB[nc:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld])
 (;B[nc]
 ;W[md]
 ;B[mc]
 ;W[kd]))
 (;W[qe]
 ;B[ne]LB[pd:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[oc]
 ;W[md]LB[re:b][nf:a]C[Black continues with 'a' or 'b'.]
 (;B[nf]
 ;W[of]
 ;B[le]
 ;W[kc]LB[nb:b][nh:a]C[Black continues with 'a' or 'b'.]
 (;B[nh])
 (;B[nb]
 ;W[ld]
 ;B[nh]
 ;W[ph]
 ;B[ke]))
 (;B[re]
 ;W[of]
 ;B[me]
 ;W[ld]
 ;B[le]LB[kd:a][ke:b][se:c]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[kd]
 ;B[qg])
 (;W[ke]C[White 20 is too aggressive.]
 ;B[mg]C[Black 21 weakens the White stones to the right.])))
 (;W[of]
 ;B[md]
 ;W[nc]
 ;B[me]
 ;W[lb]))
 (;W[oc]
 ;B[of]
 ;W[pd]
 ;B[qe]
 ;W[pg]
 ;B[nf]
 ;W[ne]
 ;B[oh]
 ;W[qi]
 ;B[lf]))
 (;B[oc]C[Black 7 is intended to take sente.]
 ;W[me]))
 (;W[nf]LB[oe:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[oe]
 ;W[of]
 ;B[md])
 (;B[pe]
 ;W[qf]
 ;B[me]
 ;W[pk])))
 (;B[pe]
 ;W[oe]
 ;B[qe]LB[of:a][ng:b]C[White continues with 'a', or possibly the looser 'b'.]
 (;W[of]LB[nc:a][oc:c][qg:b]C[Black continues with 'a' or 'b', depending upon the side of interest.
 Black 'c' is a mistake.]
 (;B[nc]
 ;W[qf]C[
 * Joseki *])
 (;B[qg]C[Black 9 emphasizes the right side.]
 ;W[nc]C[
 * Joseki *])
 (;B[oc]C[Black 9 is a mistake, as White can seal Black in.]
 ;W[nc]))
 (;W[ng]LB[of:b][qg:a]C[Black continues with 'a' or 'b'.
 Black 'a' leaves a fluid situation until later.
 Black 'b' creates solid shapes, and is the more likely variation of determined amateurs.]
 (;B[qg]
 ;W[nc])
 (;B[of]
 ;W[nf]
 ;B[og]
 ;W[oh]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[nh]LB[ne:b][qh:a]C[Black continues with 'a' or 'b'.]
 (;B[qh])
 (;B[ne]
 ;W[me]
 ;B[od]
 ;W[md]))))
 (;B[qe]LB[pe:A][qf:B]
 (;W[pe]LB[oc:b][qg:a]C[Black continues locally with 'a' or 'b', or plays elsewhere.])
 (;W[qf]
 ;B[pe]
 ;W[of]
 ;B[nd]))
 (;B[nc]LB[pc:a][qe:b]C[White resists with 'a', or goes with the flow with 'b'.]
 (;W[pc]
 ;B[pe]
 ;W[oe]
 ;B[qe]
 ;W[od]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[me]
 ;B[kc]C[Black tries to have his cake and eat it too.])
 (;W[qe]
 ;B[pc]
 ;W[od]))
 (;B[ob]C[Given just the local situation, there is no reason for Black to play so low.])
 (;B[]LB[pc:b][qe:a]C[Black plays elsewhere.
 White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pc]
 ;W[od]
 ;B[oc]
 ;W[nd]
 ;B[mc])
 (;W[pc]
 ;B[pe]LB[oe:b][qe:a]
 (;W[qe]
 ;B[oe]LB[qb:a][re:b]C[White continues with 'a'. White 'b' is awkward.]
 (;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qh]
 ;B[rg]
 ;W[ng]
 ;B[me]
 ;W[mc]
 ;B[ke])
 (;W[re]C[White 9 leads to awkward shape for the White stones at top.]
 ;B[pb]
 ;W[oc]
 ;B[ob]
 ;W[nc]
 ;B[rb]))
 (;W[oe]C[White 7 is not recommended.]
 ;B[qe]
 ;W[of]LB[od:b][qf:a]C[Black continues with 'a' or 'b'.
 Black 'a' is a consistent territory orientation. Black 'b' aims
 to create a center position.]
 (;B[qf]
 ;W[ph]
 ;B[od]
 ;W[nd]C[White sacrifices for thickeness, keeping to original strategy.]
 ;B[oc]
 ;W[pb]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[na]
 ;B[qb]
 ;W[lc]C[Black has a tidy profit, while White's thickness is less than perfect.])
 (;B[od]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[qf]
 ;B[pb]
 ;W[ob]
 ;B[qb]
 ;W[kb])))))
 (;W[pc]C[White 4 is a mistake, even with support at top as shown.]
 ;B[pe]C[Black responds to White's mistake at 4.]
 ;W[oe]
 ;B[of]LB[qe:b][pf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pf]
 ;B[qe]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[pg]LB[pb:A][nc:B]C[The black hane at 'a' plus connection remains sente.
 Also, black can attack at 'b' later])
 (;W[qe]
 ;B[pf]
 ;W[re]
 ;B[pb]
 ;W[ob]
 ;B[qb]
 ;W[od]
 ;B[rd]
 ;W[rg]
 ;B[qf]
 ;W[rf]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[rj]
 ;B[rk]
 ;W[qg]
 ;B[pg]
 ;W[qk]
 ;B[rl]
 ;W[ph]
 ;B[oh]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[nf]
 ;W[se]
 ;B[sj]
 ;W[sb]
 ;B[sd]
 ;W[pa]
 ;B[ra]
 ;W[rb]
 ;B[si]LB[sa:b][sh:a]C[Neither 'a' nor 'b' work.]
 (;W[sh]
 ;B[sk])
 (;W[sa]
 ;B[sh]))))
 (;B[oc]
 ;W[pc]
 ;B[pb]LB[ob:c][qb:b][qd:a]C[White continues with 'a' to 'c'.]
 (;W[qd]
 ;B[rb]
 ;W[rc]
 ;B[qb]
 ;W[pf])
 (;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[nc]LB[pe:a][qe:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pe]LB[od:a][qd:b]C[Black 11 is a tesuji.
 White continues with 'a'. White resistance with 'b' is futile.]
 (;W[od]
 ;B[qd])
 (;W[qd]C[White tries to resist Black's tesuji, a mistake.]
 ;B[od]C[White is at a loss as to a good next move.]))
 (;B[qe]C[Black 11 is not recommended.]
 ;W[od]))
 (;W[ob]
 ;B[nb]
 ;W[qb]
 ;B[oa]
 ;W[rc]
 ;B[od]
 ;W[qd]
 ;B[of]))
 (;B[ob]
 ;W[qd]
 ;B[rc]LB[md:c][nd:b][qh:a]C[White continues with 'a' or 'b'.]
 (;W[qh]
 ;B[nd])
 (;W[nd]LB[mc:a][oc:b]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[le])
 (;B[oc]
 ;W[od]
 ;B[rd]
 ;W[qf]))
 (;W[md]C[White 6 is an overplay.]
 ;B[nd]
 ;W[ne]
 ;B[nc]
 ;W[me]
 ;B[oe]
 ;W[of]
 ;B[pe]
 ;W[pf]
 ;B[qe]
 ;W[qf]
 ;B[re]C[White has given up too much for thickness.]))
 (;B[rb]LB[nc:A][qf:B]C[Makes miai: A-B, but it's too low.
 Tenuki is best for White too.]))
 (;W[oc]LB[ld:f][od:d][pe:a][qe:e][pf:c][qf:b][dp:g]C[
 Ikken Kakari = Hankan Keolch'im = Yi Gua` Jiao~ = 1-Space Approach
 -------------------------------------------------------------------
 Black continues with 'a' to 'f'. Black 'g' shows Black playing elsewhere.
 e5,d4,c3,b2,a1
+]
 (;B[pe]LB[lc:b][md:a]C[
 Keima = Narincha = Fei = Knight's Move
 ---------------------------------------
 White continues with 'a' or 'b'.
+]
 (;W[md]
 ;B[qi]
 ;W[ic])
 (;W[lc]
 ;B[qi]C[
 * Joseki *]
 ;W[oe]LB[of:a][pf:b]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[pd]
 ;B[qd]
 ;W[pf]
 ;B[qe]
 ;W[ne]
 ;B[pg]
 ;W[nf]
 ;B[og])
 (;B[pf]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[pd]
 ;W[od])))
 (;B[qf]LB[lc:a][oe:b][of:c]C[
 -Space Extension = Nikken Biraki = Dukan Peollim = Chai E`r
 -------------------------------------------------------------
 Black 3 is mild.
 White continues with 'a' to 'c'. White 'd' show White playing elsewhere.
 d4, c3, b2, a1
+]
 (;W[lc]
 ;B[]C[Black plays elsewhere.]
 ;W[qb]C[White 6 looks like an endgame move, but is more threatening than that.]
 ;B[rb]LB[pb:b][qd:a]C[White continues with the fiesty 'a', or 'b'.]
 (;W[qd]C[Black 8 is a clamping tesuji, and an invitation to a fight.]
 ;B[pc]
 ;W[pd]
 ;B[od])
 (;W[pb]
 ;B[]C[Black plays elsewhere.]
 ;W[qh]
 ;B[of]
 ;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[qe]
 ;W[re]
 ;B[qd]
 ;W[oh]))
 (;W[oe]LB[kd:c][pd:b][of:d][pg:a][dp:e]C[Black continues with 'a' to 'c'. Black 'd' shows Black playing elsewhere.
 e5, d4, c3, b2, a1]
 (;B[pg]
 ;W[qb]
 ;B[rb]
 ;W[qd]
 ;B[rd]
 ;W[pc]
 ;B[rc]
 ;W[kd])
 (;B[pd]
 ;W[od]
 ;B[pg]
 ;W[kc])
 (;B[kd]LB[qb:a][pg:b]C[White continues with 'a'. White 'b' is not recommended, as it can start a slippery slope to disaster.]
 (;W[qb]
 ;B[rb]
 ;W[qd]
 ;B[rd]
 ;W[pc]
 ;B[rc]
 ;W[qe]
 ;B[re]
 ;W[pf]
 ;B[qg])
 (;W[pg]C[White 6 is an overplay.]
 ;B[pf]
 ;W[of]
 ;B[og]
 ;W[pi]
 ;B[ng]
 ;W[qg]
 ;B[pd]
 ;W[od]
 ;B[me]
 ;W[rd]
 ;B[qd]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[rf]
 ;B[re]
 ;W[se]
 ;B[qe]
 ;W[qb]
 ;B[pb]
 ;W[rg]
 ;B[ob]
 ;W[md]
 ;B[nc]
 ;W[nd]
 ;B[ld]
 ;W[mc]
 ;B[nb]))
 (;B[of]
 ;W[nf]
 ;B[og]
 ;W[qe]
 ;B[re]
 ;W[pe]
 ;B[rg]
 ;W[kd])
 (;B[]C[Black plays elsewhere.]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]))
 (;W[of]
 ;B[ph]
 ;W[jd])
 (;W[]C[White plays elsewhere.]
 ;B[ld]
 ;W[oe]
 ;B[pd]
 ;W[od]
 ;B[pg]
 ;W[mg]LB[id:a][nf:b]C[White 12 is a tesuji. Black immediately playing at 'b' weakens Black 7, so is not advised.
 Black 'a' is one possible continuation.]
 (;B[id]C[Black 11 is one possible extension.])
 (;B[nf]C[Black 11 is not recommended.]
 ;W[qe]
 ;B[pe]
 ;W[of]
 ;B[og]
 ;W[pf]LB[re:b][qg:a]C[Black may try 'a' or 'b'.]
 (;B[qg]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[rd]
 ;W[me]
 ;B[ng]
 ;W[id])
 (;B[re]
 ;W[qg]
 ;B[rf]
 ;W[ng]
 ;B[qh]
 ;W[me]))))
 (;B[pf]LB[lc:b][kd:a][qd:c]C[
 Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
 ----------------------------------------------------
 White continues with 'a'. White 'b' is not recommended.
+]
 (;W[kd]C[White plays large like Black. This is appropriate.])
 (;W[lc]LB[pc:a][dp:b]C[White 4 is too short an extension.
 White continues locally with 'a', or plays elsewhere ('b').]
 (;B[pc]
 ;W[od]
 ;B[ph])
 (;B[]C[Black plays elsewhere.]
 ;W[qh]LB[qf:a][dp:b]C[Black continues with 'a'. 'b' shows Black playing elsewhere.]
 (;B[qf])
 (;B[]C[Black plays elsewhere.]
 ;W[qe]LB[pd:b][pe:a]C[Black continues with 'a' or 'b'.]
 (;B[pe]LB[pd:b][qd:a]C[White continues with 'a' or 'b'.]
 (;W[qd]
 ;B[pd]
 ;W[pc]
 ;B[qf]
 ;W[rc])
 (;W[pd]
 ;B[qd]
 ;W[re]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[nd]
 ;B[rb]))
 (;B[pd]LB[pe:b][qf:a]C[White continues with 'a' for territory on both sides, or 'b' to push into the center at the sacrifice of the group at top.]
 (;W[qf]
 ;B[pg]
 ;W[ph]
 ;B[od]
 ;W[nc]
 ;B[oh]
 ;W[oi]
 ;B[nh]
 ;W[qg]
 ;B[nf])
 (;W[pe]
 ;B[od]
 ;W[oe]
 ;B[nc]
 ;W[ne]
 ;B[]C[Black plays elsewhere.]
 ;W[nb]
 ;B[nd]
 ;W[ob]
 ;B[ld]
 ;W[kc]
 ;B[me]
 ;W[mf]
 ;B[lf]
 ;W[mg])))))
 (;W[qd]C[White 4 is not recommended, as it gives Black good shape.]
 ;B[pd]
 ;W[pc]
 ;B[qe]
 ;W[qb]
 ;B[rd]
 ;W[rb]
 ;B[md]
 ;W[mb]))
 (;B[od]C[
 Ue-zuke (attach on top)
 --------------------------
+]
 ;W[nd]LB[pd:a][oe:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]LB[mc:b][nc:c][ne:a][dp:d]C[White continues with 'a' to 'c'. White 'd' shows tenuki.]
 (;W[ne]
 ;B[nc]
 ;W[mc]
 ;B[nb]LB[mb:a][ld:b]C[White continues with 'a' to emphasize the top, 'b' to target
 the right side.]
 (;W[mb]
 ;B[ob]
 ;W[le])
 (;W[ld]
 ;B[ob]C[Black 11 is honte (the proper move).]
 ;W[pf]))
 (;W[mc]LB[ne:a][pg:b][dp:c]C[Black continues with 'a' or 'b'. 'c' shows Black playing elsewhere.]
 (;B[ne]
 ;W[me]LB[mf:b][nf:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[nf])
 (;B[mf]C[Black 9 is an overplay.]
 ;W[nf]
 ;B[oe]LB[le:a][ng:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[le]
 ;B[ng]
 ;W[lf]
 ;B[mg]C[White 10 has aji, and White is more solid.])
 (;W[ng]C[White 12 is an overplay.]
 ;B[le]
 ;W[md]
 ;B[lf]
 ;W[kd]
 ;B[pg]
 ;W[ni]C[Black's three stones in the center can escape with relative ease.
 Black can press the White center stones for profit.])))
 (;B[pg]
 ;W[jd])
 (;B[]LB[nf:a][pf:b]C[White continues with 'a'. White 'b' is an unreasonable overplay.]
 (;W[nf]
 ;B[qf])
 (;W[pf]C[White 8 is unreasonable.]
 ;B[of]
 ;W[oe]
 ;B[pe]
 ;W[ne]
 ;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[qe]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[rc]
 ;B[rd])))
 (;W[nc]LB[jd:b][ne:a][of:c]C[White 6 is a bit slow, but playable.
 Black continues with 'a' to 'c'.]
 (;B[ne]
 ;W[me]LB[mf:b][nf:a]C[Black continues with 'a' or 'b'.]
 (;B[nf]
 ;W[mf]
 ;B[ng])
 (;B[mf]
 ;W[le]
 ;B[nf]
 ;W[id]))
 (;B[jd]LB[nf:a][dp:b]C[White continues with 'a', or plays elsewhere ('b').]
 (;W[nf]
 ;B[pg])
 (;W[]C[White plays elsewhere.]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[nf]
 ;B[oe]
 ;W[le]
 ;B[mg]))
 (;B[of]
 ;W[ne]
 ;B[jd]))
 (;W[]LB[nc:a][ne:b]C[Black continues with 'a', or, with support at right, 'b'.]
 (;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[md]
 ;B[ob])
 (;B[ne]C[Black plays 7 as shown with support at right.]MA[pj]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[kf])))
 (;B[oe]LB[mc:b][nc:c][pc:a][ne:d]C[White continues with 'a'. White 'b' and 'c' are not recommended.
 White 'd' gives away too much territory.]
 (;W[pc]
 ;B[qd])
 (;W[mc]C[White 6 is slow.]
 ;B[pc]
 ;W[ob]LB[ld:c][ne:b][pi:a]C[Black continues with 'a' to 'c'.]
 (;B[pi])
 (;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[pj])
 (;B[ld]LB[lc:b][ne:a]C[White continues with 'a' or 'b'.]
 (;W[ne]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[lf]
 ;B[id]
 ;W[kb])
 (;W[lc]
 ;B[jd]
 ;W[le]
 ;B[ph])))
 (;W[nc]LB[kd:a][dp:b]C[White 6 is slow.
 Black continues with 'a'. Variation 'b' shows Black playing elsewhere.]
 (;B[kd]LB[pd:b][ne:a][qe:c]C[White continues with 'a'. White 'b' is unreasonable. White 'c' is not good either.]
 (;W[ne]
 ;B[of]
 ;W[mg]
 ;B[oh])
 (;W[pd]C[White 8 is unreasonable.]
 ;B[pc]
 ;W[pe]
 ;B[pf]
 ;W[of]
 ;B[ne]
 ;W[qf]
 ;B[pg]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[me]
 ;B[nf])
 (;W[qe]C[White 8 is not recommended.]
 ;B[qd]
 ;W[re]
 ;B[pc]
 ;W[ne]
 ;B[of]
 ;W[qh]
 ;B[oh]
 ;W[lf]
 ;B[qi]
 ;W[ri]
 ;B[qg]
 ;W[rg]
 ;B[ph]
 ;W[rh]
 ;B[qj]))
 (;B[]C[Black plays elsewhere.]
 ;W[qe]LB[pd:b][qd:a][qf:c][pg:d]C[Black continues with 'a'. Black 'b' is not recommended. Black 'c' is a mistake, as is Black 'd'.]
 (;B[qd]
 ;W[re]
 ;B[pc]
 ;W[qh]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le])
 (;B[pd]C[Black 9 is not recommended.]
 ;W[qh])
 (;B[qf]LB[pf:a][rf:b]C[Black 9 is a mistake.
 White continues with 'a' or 'b'.]
 (;W[pf]
 ;B[pe]
 ;W[qd]
 ;B[pd]C[Black's shape simply could not be worse.]
 ;W[rf]
 ;B[qg]
 ;W[pc]
 ;B[rc]
 ;W[re]
 ;B[rg]
 ;W[nf]C[White 20 starts building great thickness the sacrifice of the four White stones.]
 ;B[of]
 ;W[og]
 ;B[pg]
 ;W[ne]
 ;B[pf]
 ;W[oh])
 (;W[rf]
 ;B[qg]
 ;W[pc]
 ;B[qd]
 ;W[pd]
 ;B[re]
 ;W[pe]
 ;B[rd]
 ;W[og]))
 (;B[pg]
 ;W[pc]
 ;B[qd]
 ;W[pd]
 ;B[pe]
 ;W[re]
 ;B[rb]
 ;W[rd]
 ;B[rc]
 ;W[qh]
 ;B[pb]
 ;W[ob]
 ;B[pa]
 ;W[ne])))
 (;W[ne]LB[nc:a][nf:b]C[White 6 gives away too much territory.
 Black 'a' takes advantage of White's mistake, whereas 'b' lets White's move seem playable.]
 (;B[nc]LB[mc:a][pc:b]C[White continues with 'a' or 'b', neither favorable.]
 (;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[nf]
 ;B[pg])
 (;W[pc]
 ;B[pd]
 ;W[qb]
 ;B[qd]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[rb]
 ;B[nf]
 ;W[me]
 ;B[jd]
 ;W[mf]
 ;B[ng]))
 (;B[nf]LB[nc:b][pc:a]C[Black 7 is not recommended.
 White continues with 'a' or 'b'.]
 (;W[pc]
 ;B[qd])
 (;W[nc]
 ;B[of]
 ;W[jc]
 ;B[pc])))))
 (;B[qe]C[
 -Space Extension = Ikken Biraki = Hankan Peollim = Chai Yi
 ------------------------------------------------------------
+]
 ;W[lc]LB[qi:A]C[A is a continuation for Black])
 (;B[ld]LB[qd:A][oe:B]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 'a' or 'b'.
+]
 (;W[qd]LB[pc:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[pd]
 ;B[re]
 ;W[qb]
 ;B[rc]
 ;W[pg])
 (;B[pc]
 ;W[pd]
 ;B[od]
 ;W[oe]
 ;B[nd]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nc]
 ;W[qh]LB[lb:B][ob:A]C[Aji for White on 'a' and 'b'.]))
 (;W[oe]
 ;B[qe]
 ;W[og]
 ;B[qg]
 ;W[id]))
 (;B[]C[Black plays elsewhere. This is not recommended. Black will be
 forced low to live.]
 ;W[pe]
 ;B[pd]
 ;W[od]
 ;B[qe]
 ;W[qf]
 ;B[rf]LB[re:b][pf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pf]
 ;B[rd]
 ;W[pc]
 ;B[qd]
 ;W[jd])
 (;W[re]C[White 10 is an overplay.]
 ;B[qd]
 ;W[pf]
 ;B[rg])))
 (;W[nd]LB[jd:c][pd:f][pe:b][qe:e][pf:a][qf:d][dp:g]C[
 -Space High Approach = Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaogua`jiao~
 -------------------------------------------------------------------------------------
 Black continues with 'a' or 'b'. Black 'a' works well when Black is in the lower right (so an extension in the middle works both ways). The more conservative 'b' is makes a slightly tighter shape (better for a fight).
 Black 'c' is possible if Black has an extension on the right side.
 Black 'd' may be best if White has a stone on the right side that blocks extension.
 Black 'e' and 'f' threaten an invasion on the top.
 Black 'g' plays elsewhere.
+]
 (;B[pf]C[
 Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
 ----------------------------------------------------
+]
 ;W[jc]LB[qj:A][dp:B]C[The Black extension 'a' is joseki. Tenuki 'b' is possible, although not recommended.]
 (;B[qj]LB[oc:A][pc:C][qe:D][nf:B]C[
 * Joseki *
 'a' and 'b' are good continuations. 'c' is disadvantageous. 'd'
 is wrong.]
 (;W[oc]LB[pc:A][dp:B]C[Black continues on 'a'. Tenuki 'b' is disadvantageous.]
 (;B[pc]
 ;W[nf])
 (;B[dp]
 ;W[qb]LB[rb:B][qd:A]C['a' is right. 'b' is a mistake.]
 (;B[qd]
 ;W[rb])
 (;B[rb]
 ;W[qd]
 ;B[pd]
 ;W[pc]
 ;B[rc]
 ;W[pe]
 ;B[qe]
 ;W[od]
 ;B[rd])))
 (;W[nf]LB[oc:A][pc:B])
 (;W[pc]C[White settles the corner in sente, but solidifies Black.]
 ;B[pd]
 ;W[oc]
 ;B[qb]
 ;W[nf]
 ;B[ph]C[Black is better off.])
 (;W[qe]
 ;B[pe]
 ;W[qd]
 ;B[pd]
 ;W[rc]
 ;B[qf]
 ;W[pc]
 ;B[qb]
 ;W[rb]
 ;B[re]
 ;W[rd]
 ;B[oc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[od]C[White has eleven points, but Black has huge influence, and the
 White stones on top are hurt.]))
 (;B[dp]
 ;W[qh]
 ;B[qf]
 ;W[pc]
 ;B[pd]
 ;W[oc]
 ;B[qb]
 ;W[oh]))
 (;B[pe]LB[jc:a][qg:b]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 White continues with 'a'. White 'b' is possible with support
 at right.
+]
 (;W[jc]LB[lc:C][qi:A][dp:B]C['a' is joseki, tenuki 'b' and the invasion 'c' are possible.]
 (;B[qi]C[
 * Joseki *]
 ;W[pc]LB[oc:b][pd:a]C[Black continues with 'a'. Black 'b' gives White the corner in
 sente, a local loss.]
 (;B[pd]
 ;W[oc]
 ;B[qb]
 ;W[nf]
 ;B[pg])
 (;B[oc]LB[od:b][pd:a]C[Black 7 is not recommended.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]
 ;B[od]
 ;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[oe]LB[ob:B][re:A]C['a' secures the White corner. 'b' does the same, but strenghens
 Black.]
 (;W[re])
 (;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]))
 (;W[od]C[White 8 is a mistake.]
 ;B[pd]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[rb]
 ;W[rc]
 ;B[qd]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pa]
 ;W[sa]
 ;B[rb]
 ;W[sb]
 ;B[oa]
 ;W[qa]
 ;B[rd]
 ;W[nc]
 ;B[sd]
 ;W[nb]
 ;B[rb])))
 (;B[dp]
 ;W[qg]
 ;B[of]
 ;W[pi]
 ;B[rf])
 (;B[lc]
 ;W[ld]
 ;B[mc]
 ;W[md]
 ;B[nc]
 ;W[od]
 ;B[pc]
 ;W[kc]))
 (;W[qg]C[In this case, Black 3 was a mistake.]
 ;B[of]C[Black must play 5 to get to the center.]
 ;W[kd]LB[oc:b][re:a]C['a' and 'b' are local vital points.]))
 (;B[jd]C[A pincer around Black 3 is possible if Black has support such as the stone shown on the right side.]
 ;W[pd]
 ;B[qd]
 ;W[pf]C[White aims to settle himself playing loosely.]
 ;B[qe]
 ;W[ng]
 ;B[qg]
 ;W[hd]C[White 10 is a checking extension. This play makes sense if White has support in the top right corner, as shown.])
 (;B[qf]C[
 -Space Extension = Nikken Biraki = Dukan Peollim = Chai E`r
 -------------------------------------------------------------
 Black plays 3 if White has a stone as shown that blocks Black from extending down the right side.
 ])
 (;B[qe]C[
 -Space Extension = Ikken Biraki = Hankan Peollim = Chai Yi
 ------------------------------------------------------------
+]
 ;W[jc]LB[lc:A][dp:B]C[Black wants to take away White's base on 'a' or not and plays tenuki 'b'.]
 (;B[lc]LB[pc:B][ld:A]C['a' or 'b'.]
 (;W[ld]
 ;B[mc]
 ;W[md]LB[ob:A][nc:B]C['a' is right, 'b' leads to overconcentration.]
 (;B[ob]
 ;W[kc])
 (;B[nc]
 ;W[kc]
 ;B[od]
 ;W[oe]
 ;B[pd]TR[qe]C[Now, the triangled stone is too near.]))
 (;W[pc]
 ;B[pd]
 ;W[oc]LB[qb:A][le:B]C[Black gives White a safe group and takes much influence on 'a' or hunts on 'b'.]
 (;B[qb]
 ;W[kd]
 ;B[me]
 ;W[ld]
 ;B[md]
 ;W[mc]
 ;B[ne]
 ;W[lb])
 (;B[le]
 ;W[qb]
 ;B[rc])))
 (;B[dp]
 ;W[pc]
 ;B[pd]
 ;W[oc]
 ;B[qb]))
 (;B[pd]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
+]
 ;W[jc]LB[lc:A][qh:B]C[Black 'a' or 'b'.]
 (;B[lc]
 ;W[ld]
 ;B[mc]
 ;W[md]
 ;B[nc]
 ;W[kc]
 ;B[od])
 (;B[qh]
 ;W[oc]))
 (;B[dp]LB[pe:B][qe:A]C[
 Tenuki
 -------
 White on 'a' or 'b'.
+]
 (;W[qe]LB[nb:A][oc:B][pe:C]C[Black continues on 'a', 'b' and 'c' are mistakes.]
 (;B[nb]LB[mb:B][pj:A]C[White makes a light extension on 'a' or gives Black the choice on 'b'.]
 (;W[pj])
 (;W[mb]LB[ob:B][mc:A]C[Black outside and gives away the corner on 'a' or lives in the corner without being fully enclosed on 'b'.]
 (;B[mc]
 ;W[nc]
 ;B[lb]
 ;W[ob]
 ;B[ma]
 ;W[pc]
 ;B[le])
 (;B[ob]
 ;W[mc]
 ;B[pe]
 ;W[qf]
 ;B[qd]
 ;W[ph])))
 (;B[oc]
 ;W[nc]
 ;B[pe]LB[pd:B][qf:A]C['a' or 'b'.]
 (;W[qf]
 ;B[qd]
 ;W[pf]
 ;B[oe]
 ;W[ng]
 ;B[mf]
 ;W[kd])
 (;W[pd]
 ;B[qd]
 ;W[pf]
 ;B[oe]
 ;W[od]
 ;B[qf]
 ;W[re]
 ;B[of]
 ;W[rf]
 ;B[pg]
 ;W[qh]
 ;B[rd]
 ;W[qg]C[Black isn't yet alive in the corner and heavy in the center.]))
 (;B[pe]
 ;W[pd]
 ;B[qd]
 ;W[re]
 ;B[pf]
 ;W[pc]
 ;B[pb]
 ;W[ob]
 ;B[qb]
 ;W[qg]C[The Black corner is dead.]))
 (;W[pe]LB[nb:A][re:B]C[Black lives on 'a' or 'b'.]
 (;B[nb])
 (;B[re]))))
 (;W[od]LB[oc:e][pd:d][pe:a][qe:b][qf:c]C[
 -Space High Approach = Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaokeolch'im
 ------------------------------------------------------------------------------------
 White 2 is a high tight attack with a direction bias.
 White continues with 'a'. Tactically, any other response is less advantageous.
+]
 (;B[pe]LB[jd:c][kd:b][oe:a][nf:e][ph:d][dp:f]C[
 Keima = Narincha = Fei = Knight's Move
 ---------------------------------------
 White continues with 'a' to 'd'. White 'e' indicates a special strategy of influence toward the top-left. Variation 'f' covers White playing elsewhere.
+]
 (;W[oe]
 ;B[pf]
 ;W[pc]
 ;B[qb]LB[kd:a][of:b]C[White continues with 'a', or plays on a large scale with 'b'.]
 (;W[kd])
 (;W[of]
 ;B[pg]
 ;W[nh]))
 (;W[kd]
 ;B[oe]
 ;W[oc]
 ;B[ne]
 ;W[md]
 ;B[pj]C[The joseki concludes.]
 ;W[qb]C[A later continuation.]
 ;B[rb]
 ;W[pb]
 ;B[rd])
 (;W[jd]LB[ld:c][oe:b][pg:a][pj:e][dp:d]C[Black continues with 'a' 'b'. Black 'c' is not recommended.
 Black 'd' shows Black playing elsewhere.]
 (;B[pg]LB[oc:a][pc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc])
 (;W[pc]C[White 6 is a mistake, as it lets Black solidify the corner.]
 ;B[qb]
 ;W[oe]
 ;B[of]
 ;W[me]))
 (;B[oe]
 ;W[md])
 (;B[ld]LB[oe:a][nf:b]C[Black 5 is unreasonable.
 White continues with 'a' or 'b'.]
 (;W[oe]C[White 6 builds thickness for an attack on Black 5.]
 ;B[pf]
 ;W[of]
 ;B[pg]
 ;W[ke]
 ;B[mf]
 ;W[me]
 ;B[le]
 ;W[lf]
 ;B[md]
 ;W[mg]
 ;B[ne]
 ;W[nf])
 (;W[nf]C[White 6 is a light way of playing.]
 ;B[lf]
 ;W[pd]
 ;B[qd]
 ;W[pf]
 ;B[oe]
 ;W[ne]
 ;B[qe]
 ;W[nh]))
 (;B[]LB[pg:b][qg:a][qh:c][qi:d]C[Black plays elsewhere.
 White continues with 'a' to 'd'.]
 (;W[qg]LB[oe:a][pj:b]C[Black continues with 'a' or 'b'.]
 (;B[oe]LB[md:a][nd:b]C[White plays 'a' to preserve position at top, or 'b' to emphasize the right side.]
 (;W[md]
 ;B[ph]
 ;W[qi]
 ;B[qh]
 ;W[rh]
 ;B[pg]
 ;W[qf]
 ;B[ri]
 ;W[rj]
 ;B[pi]
 ;W[qj]
 ;B[rg]
 ;W[si]
 ;B[rf])
 (;W[nd]C[White 7 emphasizes the right side, as Black launches a splitting attack.]
 ;B[og]
 ;W[pi]
 ;B[ld]
 ;W[ne]
 ;B[ke]
 ;W[mf]
 ;B[nh]))
 (;B[pj]
 ;W[og]
 ;B[oe]
 ;W[md]LB[oc:b][ne:a]C[White continues with 'a' or 'b'.]
 (;B[ne]
 ;W[mg]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[lc]
 ;B[mb]
 ;W[nb]
 ;B[lb]
 ;W[kc]
 ;B[me]
 ;W[ld]
 ;B[oc]
 ;W[ob]
 ;B[pb]
 ;W[pc]
 ;B[pd]
 ;W[kb]
 ;B[oc])
 (;B[oc]
 ;W[mf])))
 (;W[pg]
 ;B[oe]
 ;W[md]LB[nf:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[pi]
 ;B[qg]
 ;W[qh]
 ;B[pf]
 ;W[ph]
 ;B[rg])
 (;B[nf]
 ;W[pj]
 ;B[oc]))
 (;W[qh]
 ;B[qf])
 (;W[qi]
 ;B[qg]LB[pc:b][oe:a]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[pf]
 ;W[pc]
 ;B[qb])
 (;W[pc]
 ;B[qb]
 ;W[pf]LB[oe:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[oe]
 ;B[pg]
 ;W[qe]
 ;B[of]
 ;W[qd]C[But there is still aji in the corner....]
 ;B[pb]
 ;W[ob]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[rb]
 ;B[ra]LB[pa:b][sb:a]C['a' and 'b' are miai.])
 (;B[oe]
 ;W[qf]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[md]
 ;B[ne]
 ;W[lc]
 ;B[mb]
 ;W[nb]
 ;B[lb]
 ;W[kc]
 ;B[me]
 ;W[ld]
 ;B[ob]
 ;W[pb]
 ;B[pa]
 ;W[na]
 ;B[pd]
 ;W[kb]
 ;B[oc]
 ;W[la])))))
 (;W[ph]LB[oe:a][qf:b]C[Black gets out with 'a' or settles shape locally with 'b'.]
 (;B[oe]C[Black keeps White separated.]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[lf]
 ;B[mg]
 ;W[lg]
 ;B[mh]
 ;W[pk])
 (;B[qf]C[Black settles his shape in sente.]
 ;W[kd]))
 (;W[nf]C[White aims for influence at top, but gives away a large corner.]
 ;B[oe]
 ;W[ne]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[pg])
 (;W[]
 ;B[kd]
 ;W[md]
 ;B[pg]
 ;W[mf]
 ;B[kf]
 ;W[mh]))
 (;B[qe]C[
 -Space Extension = Ikken Biraki = Hankan Peollim = Chai Yi
 ------------------------------------------------------------
+]
 ;W[pc]LB[qb:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[qb]LB[ld:a][of:b][pf:c]C[White continues with 'a' to 'c'.]
 (;W[ld])
 (;W[of]LB[pg:a][dp:b]C[Black continues with 'a', or plays elsewhere ('b').]
 (;B[pg]
 ;W[kd])
 (;B[]C[Black plays elsewhere.]
 ;W[qf]
 ;B[rf]
 ;W[pe]
 ;B[qd]
 ;W[qg]
 ;B[rg]
 ;W[qh]))
 (;W[pf]LB[pe:B][qf:A]C[Black continues with 'a', or the fighting move (finally) of 'b'.]
 (;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph])
 (;B[pe]
 ;W[oe]
 ;B[of]LB[qf:a][pg:c][ph:b]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[ph]
 ;B[og]
 ;W[pi]
 ;B[mf]
 ;W[md]
 ;B[mi])
 (;W[ph]LB[nf:a][pg:b]C[White 10 is a tesuji.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nf]
 ;W[qf]
 ;B[rf]LB[md:a][rg:b]C[White continues with 'a' or the fierce move at 'b'.]
 (;W[md]
 ;B[rg]
 ;W[qh]
 ;B[nh]
 ;W[pk]
 ;B[jd])
 (;W[rg]
 ;B[md]
 ;W[rd]C[White 16 is the vital point.]
 ;B[qd]
 ;W[re]LB[ob:a][nc:b]C[Black may try 'a' or 'b'.]
 (;B[ob]
 ;W[nc]
 ;B[oc]
 ;W[nd]
 ;B[mc]
 ;W[nb]
 ;B[pd]
 ;W[oa]
 ;B[pb]
 ;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[kb]
 ;W[jb]
 ;B[jc]
 ;W[kd]
 ;B[ib]
 ;W[me]
 ;B[le]
 ;W[mf]C[White 40 is the vital point.])
 (;B[nc]
 ;W[pb]
 ;B[rc]
 ;W[ra]
 ;B[qa]
 ;W[pa]
 ;B[oc]
 ;W[pd]
 ;B[sc]
 ;W[sf]C[Black loses the capturing race.])))
 (;B[pg]C[Black 11 is a mistake.]
 ;W[og]
 ;B[qf]
 ;W[nf]
 ;B[oh]
 ;W[pf]
 ;B[qg]
 ;W[pi]
 ;B[nh]
 ;W[oj]
 ;B[lh]
 ;W[lf]))
 (;W[pg]C[White 10 is not recommended, as it is unnecessarily heavy. Variation 'a', the one-space jump, gives a more favorable result to White.]
 ;B[nf]
 ;W[md]
 ;B[oh]
 ;W[qi]
 ;B[rf]
 ;W[rg]
 ;B[mh]
 ;W[jd]
 ;B[pj]
 ;W[qj]
 ;B[pk]))))
 (;B[pd]
 ;W[oc]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[qb]))
 (;B[qf]C[
 Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
 -------------------------------------------------------------
 ])
 (;B[pd]LB[oc:b][oe:a][pe:c]C[
 Kosumi-Tsuke = Diagonal Attach
 -------------------------------
 White continues with 'a' or 'b'. White 'c' is a mistake.
+]
 (;W[oe]LB[oc:a][pf:b]
 (;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[pe]
 ;B[qe]
 ;W[qf]
 ;B[re]
 ;W[me])
 (;B[pf]
 ;W[oc]LB[kc:b][pe:a]
 ;B[kc]
 ;W[pe]
 ;B[qe]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[pg]
 ;W[qb]
 ;B[rb]
 ;W[rd]
 ;B[qd]
 ;W[rc]
 ;B[pb]
 ;W[pc]
 ;B[qa]
 ;W[re]
 ;B[qb]
 ;W[ob]
 ;B[rg]
 ;W[sb]
 ;B[sc]
 ;W[sd]
 ;B[sf]
 ;W[oa]
 ;B[sa]
 ;W[ra]))
 (;W[oc]
 ;B[pe]
 ;W[kc])
 (;W[pe]C[White 4 is a mistake.]
 ;B[qe]
 ;W[pc]
 ;B[qd]
 ;W[oc]
 ;B[pf]
 ;W[oe]LB[jc:d][ph:c][qh:b][qi:a]C[Black extends with 'a' to 'c', depending upon the situation in the lower right, or thwarts White at the top with 'd'.]
 (;B[qi])
 (;B[qh])
 (;B[ph])
 (;B[jc]C[Black cannot afford to be any closer to the thick White stones.])))
 (;B[oc]LB[nc:B][pd:A]C[
 Tsuke
 ------
 'a' or 'b'.
+]
 (;W[pd]
 ;B[pc]
 ;W[nd]
 ;B[re]
 ;W[pg])
 (;W[nc]
 ;B[nd]
 ;W[oe]
 ;B[mc]
 ;W[pc]
 ;B[nb]
 ;W[ob]
 ;B[nc]
 ;W[pd]
 ;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rc])))
 (;W[nc]LB[kd:a][pe:c][dp:b]C[
 -Space Low Approach = Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~
 -----------------------------------------------------------------------
 Black can thwart White's strategy with a play at 'a', ignore White 2 ('b') or simply extend on 'c'.
+]
 (;B[kd]LB[pd:a][qd:b]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 White continues with 'a' or 'b'.
+]
 (;W[pd]LB[pc:a][re:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]LB[oc:a][qd:b]C[White continues with 'a' or 'b'. White 'b' is tough-minded.]
 (;W[oc]
 ;B[re]
 ;W[pf]
 ;B[qg]
 ;W[oh])
 (;W[qd]C[White 6 provokes a fight.]
 ;B[oc]
 ;W[od]
 ;B[nd]
 ;W[md]
 ;B[ne]
 ;W[mb]
 ;B[rd]
 ;W[re]
 ;B[rc]
 ;W[me]
 ;B[nf]
 ;W[pf]
 ;B[ob]))
 (;B[re]
 ;W[pc]
 ;B[qb]))
 (;W[qd]
 ;B[pd]
 ;W[pc]
 ;B[qe]
 ;W[rd]
 ;B[oc]
 ;W[pb]
 ;B[pe]))
 (;B[]C[
 Tenuki
 --------
 Black plays elsewhere.
+]
 ;W[qe]LB[pd:a][dp:b]C[Black continues locally with 'a', or Black can ignore White again, and still live in the corner ('b').]
 (;B[pd]
 ;W[pe]
 ;B[nd]
 ;W[md]
 ;B[ne])
 (;B[]C[Black plays elsewhere again.]
 ;W[oe]
 ;B[ob]
 ;W[nb]
 ;B[oc]
 ;W[od]
 ;B[rd]
 ;W[re]
 ;B[rb]))
 (;B[pe]C[
 Keima = Narincha = Fei = Knight's Move
 ---------------------------------------
+]
 ;W[kc]
 ;B[qi]))
 (;W[pc]C[White 2 is not recommended.]
 ;B[pd]LB[oc:a][qd:b]C[White 'a' is sensible (a change of strategy from the silliness of White 2), but White 'b' is to be expected.]
 (;W[oc]
 ;B[qd]
 ;W[od]
 ;B[qh]
 ;W[kc]C[Of course, either player could have played on the fourth line instead.])
 (;W[qd]C[Chances are that White had complications in mind with White 2, hence the cross-cut.]
 ;B[rc]C[Black could have as well played R18 rather than S17 (as shown).
 Regardless of continuation, Black captures either White 2 or White 4.]
 ;W[qe]
 ;B[oc])))
 (;B[qd]LB[nc:b][oc:a][qc:i][nd:c][od:d][qf:h][pg:g][qj:f][dp:e]C[
 -4 Point = Komoku = Somok = Xiao~mu`
 ---------------------------------------------
 The komoku (3-4) point is the traditional corner enclosure move.
 White approaches with 'a', 'b', 'c' or 'd'.
 'e' covers enclosure (shimari) joseki.
 White 'f', 'g' and 'h' are special strategies, usually against the Chinese Fuseki.
 'i' is not joseki, but simply an invasion to take the corner after Black made a shimari-less moyo on top disabling the other moves.
 g7, f6, e5, d4, c3, b2, a1
+]
 (;W[oc]LB[kc:f][lc:e][mc:d][pc:l][kd:i][ld:h][md:g][nd:k][od:j][oe:m][pe:a][pf:b][qg:c][dp:n]C[
 -Space Low Pincer = Ikken Kakari = Hankan Keolch'im = Yi Gua`jiao~
 --------------------------------------------------------------------
 The small knight move is the basic approach move to the 3-4 point stone. It has been continually used for over four centuries. There are limitless variations, with new moves constantly being discovered. White 2 opens the door to a treasure store of joseki.
 Black responds with 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k' or plays elsewhere 'n'.
 'a' is the Shusaku joseki.
 Black 'l' indicates a special strategy based upon favorable local position.
 The variations after 'h' are manyfold, so this branching is as complicated as the avalanche or taisha joseki.
 'k' is somewhat a trick play. Black must have the ladder.
 'm' is a trick play.
 m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1, b2, c3, j10, k12 - Black right
 d4, e5, g7, h8, i9 - White choice
 f6 - variable
 k11 - Black thick outside, White big corner
 m13 - Black right high, White top territory
+]
 (;B[pe]LB[jc:d][kc:c][lc:b][qc:h][md:a][nd:g][qi:e][dp:f]C[
 Shusaku's Diagonal Move = Shusaku Kosumi
 -----------------------------------------
 Black 3, the famous Shusaku diagonal move, is a steady way of responding to White's kakari. Black can now aim to press against the lone White stone with 'a'.
 White's possible local responses are 'a' through 'd' or 'h'.
 White 'a': White must be prepared to fight.
 White 'b': secure.
 White 'c': invites sacrifice.
 White 'd': played as an extension from the top left; invites invasion.
 'e'.
 Variation 'f' shows Black continuations when White plays elsewhere.
 White 'g' is an Edo period (1600-1867) joseki that has since been abandoned as unfavorable to White.
 f6, e5, d4, c3, b2, a1
+]
 (;W[md]LB[kc:b][qj:a]C[White must be prepared for a fight. Black finishes the joseki with 'a', or starts a fight with 'b'.]
 (;B[qj]
 ;W[ic]C[
 * Joseki *]
 ;B[pc]C[Continuation. The difference between Black and White playing here (White at R18) is nearly 20 points. This is a large endgame move.]
 ;W[od]
 ;B[pb])
 (;B[kc]LB[qb:b][hd:a]C[Black must consider the upper left corner when playing this way. Without support this is an overplay for Black.
 White attacks the lone Black stone with 'a' (joseki), or slides in the corner with 'b', which is not joseki, as 'b' has problems.]
 (;W[hd]
 ;B[ke]
 ;W[mf])
 (;W[qb]C[The slide of White 6 is not recommended.]
 ;B[qi]LB[mb:a][lc:b][kd:c]C[White doesn't have a good follow-up. Black 'a' is intolerable, but White 'b', Black 'c' is not favorable to White.])))
 (;W[lc]LB[pc:a][qj:b][dp:c]C[Black continues with 'a' or possibly 'b'. Playing elsewhere ('c'; tenuki) is not joseki.
 c3, b2, a1]
 (;B[pc]
 ;W[od]
 ;B[pg])
 (;B[qj]LB[qb:b][ne:a]C[White continues with 'a'. White 'b' gives Black a chance for moyo.]
 (;W[ne]
 ;B[pc]
 ;W[ob]
 ;B[pg]C[
 * Joseki *])
 (;W[qb]
 ;B[nd]
 ;W[nc]
 ;B[le]))
 (;B[]C[Black plays elsewhere (not joseki).]
 ;W[qb]C[White makes ideal shape if Black plays elsewhere.]
 ;B[qi]))
 (;W[kc]LB[mc:A][pc:B]C[The three-space extension is a light move and is most often used in actual games.
 'a' is joseki, 'B is a mistake.]
 (;B[mc]LB[mb:b][oe:a]C[White continues with 'a' or 'b'. White 'a' leads to capture of Black 5 at top. White 'b' leads to thickness at the loss of territory.]
 (;W[oe]
 ;B[of]
 ;W[ne]LB[pc:B][pg:A]C['a' is correct. 'b' is a mistake.]
 (;B[pg]
 ;W[ld]
 ;B[pc]
 ;W[ob]C[
 * Joseki *])
 (;B[pc]
 ;W[ob]
 ;B[pg]C[White can now tenuki, because Black played his moves in the wrong order.]))
 (;W[mb]LB[lb:a][nb:b][pc:d][qj:c]C[Black continues with 'a' or 'c'. Black 'b' is a mistake.
 'd' is a trick play.]
 (;B[lb]
 ;W[lc]
 ;B[nb]
 ;W[md]
 ;B[nc]
 ;W[nd]LB[kb:b][od:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[od]
 ;W[ob]
 ;B[ma]
 ;W[oa]
 ;B[na]
 ;W[kb]
 ;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[of])
 (;B[kb]C[Black 13 is a mistake.]
 ;W[ob]
 ;B[ma]
 ;W[oe]LB[jc:a][of:b]C[No matter what Black does, White can play at 'a' or 'b', either of which are severe.]))
 (;B[nb]C[Black 7 is a mistake in direction.]
 ;W[nc]
 ;B[lb]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[ob]
 ;W[kb]
 ;B[ma]
 ;W[ke]
 ;B[pc]LB[nd:a]C[White has made good shape in sente. If Black cuts at 'a', White sacrifices the two White stones.])
 (;B[qj]
 ;W[md]
 ;B[pc]
 ;W[ob])
 (;B[pc]LB[ob:C][md:A][od:B]C['a' is correct, 'b' or 'c' is getting tricked.]
 (;W[md])
 (;W[od]
 ;B[pb])
 (;W[ob]
 ;B[od]))))
 (;B[pc]
 ;W[od]C[White gets an ideal extension.]))
 (;W[jc]LB[lc:b][nd:a]C[The four-space extension of White 4 is often played in relation to stones in the upper left corner. This extension, however, is quite wide and if Black invades, it is impossible to determine how the sequence will develop, so White must be ready for anything.
 Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[nc]LB[ld:a][md:b]C[Joseki continues with Black 'a', not 'b'.]
 (;B[ld]LB[mc:a][od:b]C[White continues with 'a', not 'b'.]
 (;W[mc]
 ;B[ne]
 ;W[lc]
 ;B[qj])
 (;W[od]C[White 8 is vulgar.]
 ;B[oe]
 ;W[md]
 ;B[me]
 ;W[ne]
 ;B[nf]LB[lc:a][le:b]C[White must play at 'a', not 'b'.]
 (;W[lc]
 ;B[nd]
 ;W[mc])
 (;W[le]C[White 14 is a mistake.]
 ;B[nd]
 ;W[mc]
 ;B[kd]C[Black has thickness and White must still defend the left side.])))
 (;B[md]C[Black 7 is poor.]
 ;W[mc]
 ;B[ld]
 ;W[lc]LB[kd:a][qj:b]C['a' and 'b' are miai, to Black's disadvantage.]))
 (;B[lc]
 ;W[oe]
 ;B[of]
 ;W[ne]LB[pc:a][le:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pc]LB[nb:b][pb:a]C[White continues with 'a'. Black 'b' is not as favorable.]
 (;W[pb]
 ;B[qb]
 ;W[le]
 ;B[qj]LB[kd:A]C[Later Black wants to play 'a'.])
 (;W[nb]))
 (;B[le]C[Black 9 is unreasonable.]
 ;W[pf]LB[og:A][pg:B]
 (;B[og]
 ;W[qf])
 (;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[re]LB[rd:b][rg:a]C[White captures the two Black stones by playing 'a' or 'b'.]))))
 (;W[qi]LB[lc:A][pc:B][nd:D][dp:C]C['a' is the usual variaton, 'b' and tenuki 'c' are possible. 'd' is a mistake.]
 (;B[lc]LB[qb:B][md:D][nd:A][oe:C]
 (;W[nd]
 ;B[pc]
 ;W[id]
 ;B[le]
 ;W[nf]
 ;B[lg]
 ;W[nh])
 (;W[qb]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[rc])
 (;W[oe]
 ;B[of]
 ;W[ne]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[id]
 ;B[le])
 (;W[md]
 ;B[ld]
 ;W[me]
 ;B[le]
 ;W[mf]
 ;B[pc]))
 (;B[pc]
 ;W[od]
 ;B[ld]
 ;W[nf])
 (;B[dp]
 ;W[qf]
 ;B[pf]
 ;W[qg]
 ;B[pc]
 ;W[od]
 ;B[qe])
 (;B[nd]
 ;W[nc]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[kc]LB[qi:4]C[The Black wall is senseless with White 4.]))
 (;W[]LB[kc:c][lc:b][nd:a]C[White plays elsewhere. Black continues with 'a' to 'c'.
 Black 'a': gives White territory.
 Black 'b', 'c': White choice of territory or outside fighting.]
 (;B[nd]LB[mc:a][nc:b]C[White continues with 'a'. White 'b' is slow and produces a heavy shape.]
 (;W[mc]LB[kc:b][nc:d][ld:a][qj:c]C[The exchange of the pressing play of Black 5 and White 6 is the classical way of handling this position. Nowadays, however, players do not like to give White secure territory so this joseki is not used very often.
 Black can play elsewhere or continue locally with 'a', 'b', 'c'
 or 'd'.]
 (;B[ld]LB[lb:a][lc:d][qc:c][md:b]C[White continues with 'a' or 'd'. White 'b' leads to a trap. White 'c' gives White life in sente.]
 (;W[lb]
 ;B[md]
 ;W[jc])
 (;W[md]
 ;B[me]
 ;W[le]
 ;B[lc]LB[mb:c][nc:a][ne:b]C[White continues with 'a'. White 'b' is a mistake. White 'c' confines White completely.]
 (;W[nc]
 ;B[ne]
 ;W[lb]
 ;B[kb]
 ;W[ma]
 ;B[jd]
 ;W[qb])
 (;W[ne]C[White 12 is a mistake.]
 ;B[mf]
 ;W[od]
 ;B[nf]
 ;W[oe]
 ;B[mb]LB[nc:a][of:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[of])
 (;W[of]C[White 18 is a mistake.]
 ;B[nc]
 ;W[pf]
 ;B[qf]
 ;W[qg]
 ;B[rg]LB[rf:b][qh:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[qh]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[qc])
 (;W[rf]C[White 24 is unreasonable.]
 ;B[qe]
 ;W[rh]
 ;B[pg]
 ;W[qh]
 ;B[og]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[re]
 ;B[rd]
 ;W[ob]
 ;B[ra]LB[qa:a]C[Black must play 37, not 'a'. White cannot save the stones in the corner.])))
 (;W[mb]
 ;B[ke]
 ;W[lf]
 ;B[lb]LB[qc:b][ne:a]C[White may try the cut at 'a' or attachment at 'b'.]
 (;W[ne]
 ;B[mf]
 ;W[nf]
 ;B[mg]
 ;W[od]
 ;B[ng]LB[of:a][pf:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[of]
 ;B[pg])
 (;W[pf]
 ;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[of]
 ;W[oe]
 ;B[og]
 ;W[qb]
 ;B[pi]C[Black 31 is the nose attachment (hana-tsuke) tesuji.]
 ;W[qh]
 ;B[qi]
 ;W[oh]
 ;B[rh]C[The five White stones will have trouble.]))
 (;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[nf]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[kf]
 ;W[lg]
 ;B[kg]
 ;W[lh]
 ;B[nh])))
 (;W[qc]
 ;B[rc]
 ;W[pb]
 ;B[qb]
 ;W[pc]LB[rb:b][md:a]C[Black continues with 'a', not 'b'.]
 (;B[md]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[re])
 (;B[rb]C[Black 13 is a mistake.]
 ;W[oe]C[White escapes to the center.]))
 (;W[lc]C[The move was played by Kim Shujun 7P against Iyama Yuta 4P in the first game of the Shinjin-O-title 2005.]
 ;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[md]
 ;B[me]
 ;W[jc]
 ;B[id]
 ;W[hc]LB[of:A]C[Later, White has a kikashi on 'a'.]
 ;W[of]
 ;B[ne]))
 (;B[kc]LB[ic:b][md:a]C[Black plays this way to emphasize the top. White continues with 'a' or 'b' ('b' to thwart Black's plan).]
 (;W[md]LB[hc:A][ke:B]
 (;B[hc])
 (;B[ke]
 ;W[ne]
 ;B[pc]))
 (;W[ic]
 ;B[ld]
 ;W[qc]C[White tries to live.]
 ;B[rc]
 ;W[rb]))
 (;B[qj])
 (;B[nc]
 ;W[nb]LB[mb:A][ob:B]C['a' or 'b'.]
 (;B[mb]
 ;W[lb]
 ;B[ob]
 ;W[ma]
 ;B[od])
 (;B[ob]
 ;W[pb]
 ;B[mb]
 ;W[oa]
 ;B[lc]
 ;W[od]
 ;B[ne]
 ;W[oe]
 ;B[of]
 ;W[pf])))
 (;W[nc]C[White 6 is poor.]
 ;B[md]LB[lc:b][mc:a]C[White continues with 'a'. White 'b' involves a ladder.]
 (;W[mc]
 ;B[ld]
 ;W[kc]
 ;B[qj])
 (;W[lc]LB[mc:a][ld:b]C[Black plays 'a' with a favorable ladder, Black if not.]
 (;B[mc]C[Black must have the ladder to play this way.]
 ;W[mb]
 ;B[nb]LB[lb:b][ob:a]C[Black plays this way then the ladder to capture 8 is favorable.
 White continues with 'a' or 'b'.]
 (;W[ob]
 ;B[lb]
 ;W[na]
 ;B[kc])
 (;W[lb]
 ;B[ob]
 ;W[pc]
 ;B[pb]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[rc]
 ;W[rd]
 ;B[sc]
 ;W[sd]
 ;B[re]
 ;W[sb]
 ;B[rc]C[White loses.]))
 (;B[ld]
 ;W[kc]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[jc]LB[kb:a][kd:b]C[Black 15 is a tesuji. White must play 'a', not 'b'.]
 (;W[kb]
 ;B[kd])
 (;W[kd]C[White 16 is a mistake. The White stones below will be captured.]
 ;B[kb])))))
 (;B[lc]LB[qb:b][nd:a][oe:c]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[nd]LB[ic:b][pc:a]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[id]
 ;B[le]
 ;W[nf]
 ;B[lg]
 ;W[nh])
 (;B[ic]
 ;W[qb]
 ;B[qi]
 ;W[rc]))
 (;W[qb]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[rc])
 (;W[oe]C[White 6 is a mistake.]
 ;B[of]
 ;W[ne]
 ;B[le]
 ;W[nf]
 ;B[og]))
 (;B[kc]LB[qb:b][ic:c][mc:a]C[White continues with 'a' or 'b'. White 'c' is also possible if White greatly favors the top.]
 (;W[mc]
 ;B[pc]
 ;W[me]
 ;B[ke]
 ;W[mg])
 (;W[qb]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[lb]
 ;B[kb]
 ;W[lc]
 ;B[ld]
 ;W[rc]
 ;B[je])
 (;W[ic]
 ;B[nd]
 ;W[mc]
 ;B[ld]LB[ic:6][kc:5][mc:8][nd:7]C[The same as variation as Black 7 and White 8 are played before Black 5 and White 6..]
 ;W[qc]
 ;B[rc]
 ;W[rb])))
 (;W[nd]C[White 4, known as the "double diagonal move", is no longer joseki, as Black gets a favorably thick shape.
 Outdated]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[kc]
 ;B[mf])
 (;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]
 ;W[lc]))
 (;B[pf]LB[kc:c][lc:b][qc:a][qh:d][dp:e]C[
 Keima = Narincha = Fei = Knight's Move
 ---------------------------------------
 The knight's move of Black 3 is a quiet response to White's kakari.
 It is not as solid as the diagonal play but it is more flexible, since Black can make a wider extension along the right side.
 The main difference between the diagonal play and the knight's move is that White has the option of attaching at 'a'. White 'b' through 'd' are other options, depending upon strategic considerations.
 Variation 5 illustrates White playing elsewhere.
 e5, d4, c3, b2, a1
+]
 (;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]
 ;B[qj]C[
 * Joseki *])
 (;B[qb]LB[pc:b][qe:a]C[White continues with 'a'. White 'b' creates bad shape.]
 (;W[qe]
 ;B[pc]
 ;W[rd]LB[qc:a][od:b]C[Black continues with 'a'. Black 'b', provoking a ko, is unreasonable.]
 (;B[qc]
 ;W[pe]
 ;B[od]
 ;W[oe]
 ;B[nd]
 ;W[lc]
 ;B[ne]
 ;W[of]
 ;B[nc]C[
 * Joseki *])
 (;B[od]C[Black 11 is unreasonable. There is no ko threat big enough.]
 ;W[qc]))
 (;W[pc]C[White 8 is not recommended.]
 ;B[qe]
 ;W[lc])))
 (;W[lc]LB[pc:a][qj:b]C[Black continues with 'a'. There is no reason to immediately play 'b'.]
 (;B[pc]
 ;W[od]
 ;B[ph])
 (;B[qj]C[Black 5 is premature.]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]LB[pb:b][qb:a]C[White can play elsewhere or 'a'. If Black 'a', White 'b'.]))
 (;W[kc]LB[ic:a][mc:b]C[Black continues with 'a' or 'b'.]
 (;B[ic]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]
 ;B[qj])
 (;B[mc]LB[mb:a][qc:b]C[Black continues with 'a', or may try 'b'.]
 (;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[nb]
 ;W[md]
 ;B[nc]
 ;W[nd]
 ;B[od]
 ;W[ob]
 ;B[ma]
 ;W[oa]
 ;B[na]
 ;W[kb]
 ;B[pc]
 ;W[oe]
 ;B[pd])
 (;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:a][qe:b]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[pe]
 ;B[od]
 ;W[oe]
 ;B[nd])
 (;B[qe]C[Black 9 is weak.]
 ;W[mb]))))
 (;W[qh]LB[kc:B][mc:A]C[White plays this way when the right is important.
 'a' or 'b'.]
 (;B[mc]
 ;W[md]
 ;B[ld]
 ;W[nd]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb])
 (;B[kc]LB[pk:a]C[Black plays 2 or 'a', depending on whole board strategy.]))
 (;W[]LB[kc:a][pc:b]C[White plays elsewhere (tenuki). Black 'a' and 'b' are possible follow-ups.]
 (;B[kc]LB[mc:b][qc:a][ld:c]C[White continues with 'a' to 'c'.])
 (;B[pc]LB[kc:a][od:b]C[White 'a' is a light move; White could also play elsewhere. White 'b' is a mistake.]
 (;W[kc])
 (;W[od]C[White 6 is a mistake. White creates a target for attack.]
 ;B[ld]))))
 (;B[qg]LB[jc:c][kc:b][pf:a]C[
 Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
 -------------------------------------------------------------
 The primary objective of Black 3 is to ensure his own safety rather than attack White. If White is thick at the bottom, Black 3 serves to forestall an attack while erasing that thickness.
 That this is a negative attitude is undeniable.
 White's local responses include 'a' through 'c'. Playing elsewhere is also usual, as Black has already played submissively.
+]
 (;W[pf]
 (;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[qe]
 ;W[qb])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[rf]
 ;B[od]
 ;W[pe]
 ;B[nc]LB[ob:a]C[Black position is weak as White can aim at extending at 'a'.]
 ;W[qi]))
 (;B[pc]C[Rare joseki]
 (;W[qf]
 ;B[od]
 ;W[qh])
 (;W[pd]
 ;B[od]
 ;W[pe]
 ;B[qc]
 ;W[nd]C[Joseki])
 (;W[od]
 ;B[qf]
 ;W[kc]C[Joseki])))
 (;W[kc]
 ;B[mc]LB[mb:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[nb]
 ;W[md]
 ;B[nc]
 ;W[nd]
 ;B[od]
 ;W[ob]
 ;B[ma]
 ;W[oa]
 ;B[na]
 ;W[kb]
 ;B[pc]
 ;W[oe]
 ;B[pd])
 (;W[pf]LB[od:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[mb]LB[lb:b][pe:a]C[Black continues with 'a'. Black 'b' is reckless.]
 (;B[pe]
 ;W[md])
 (;B[lb]C[Black 9 won't work.]
 ;W[lc]
 ;B[nb]
 ;W[md]
 ;B[nc]
 ;W[nd]
 ;B[od]
 ;W[pd]
 ;B[oe]
 ;W[pe]))
 (;B[od]LB[nd:b][qf:a]C[White continues with 'a'. White 'b' is not joseki.]
 (;W[qf]
 ;B[pc]C[The swap is locally favorable for Black, but given White thickness at right-bottom, White should be okay.])
 (;W[nd]
 ;B[oe]
 ;W[nc]
 ;B[pc]LB[md:a][qf:b]C[Black 11 makes nice shape.
 White continues with 'a'. White 'b' is unreasonable.]
 (;W[md]
 ;B[qf])
 (;W[qf]C[White 12 is unreasonable.]
 ;B[ne]
 ;W[md]
 ;B[rf]
 ;W[re]
 ;B[rh]LB[qe:a][og:b]C[If White 'a', Black 'b', and White is in trouble.])))))
 (;W[jc]
 ;B[lc]LB[gc:b][of:c][pf:a]C[White continues with 'a' to 'c'.]
 (;W[pf]LB[od:b][qf:a]C[Black continues with 'a'. Black 'b' is bad.]
 (;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]
 ;B[le])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[rf]
 ;B[od]
 ;W[pe]
 ;B[nd]))
 (;B[od]C[Black 7 is a mistake.]
 ;W[nd]
 ;B[oe]
 ;W[pc]
 ;B[nc]
 ;W[ne]LB[mc:a][pd:b]C[White 12 makes miai of 'a' and 'b'. Black is in trouble.]))
 (;W[gc]
 ;B[pc]
 ;W[od]
 ;B[pf]
 ;W[me]
 ;B[le]
 ;W[lf]
 ;B[ke]
 ;W[mg])
 (;W[of]LB[jc:4][lc:5][of:6][qg:3]C[This reverts to the variation where Black 5 and White 6 are played before Black 3 and White 4.]
 ;B[me])))
 (;B[mc]LB[qc:d][md:c][pd:g][ne:f][oe:b][pe:a][dp:e]C[
 Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
 --------------------------------------------------------------
 This is the severest attacking move, emphasizing Black's advantage from playing first in the corner. The feature of the one-space pincer is that it does not permit White to swtich lightly elsewhere.
 Many top-flight professionals are fond of this move.
 White's possible responses are 'a', 'b', 'c', 'd', 'e' to 'f'. 'f' is not joseki.
 White 'g' is sometimes seen in amateur games, and is not joseki.
 g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1, b2 - White takes the top
 c3 - different outcomes
 d4 - White gets the corner or right, depending on Black
+]
 (;W[pe]LB[pd:a][qe:b][qf:d][qg:c]C[The point of White 4 is to block at 'b' if Black plays elsewhere.
 Black continues with 'a' or 'b' in joseki.
 Black 'c' is a trick play, the aim to induce White 'b' and use
 the Black corner stone as a sacrifice in order to squeeze White.
 Black 'd' is a mistake.]
 (;B[pd]
 ;W[od]
 ;B[oe]LB[md:C][ne:A][qe:B]C['a' is joseki, 'b' is questionable. 'c' takes sente.]
 (;W[ne]
 ;B[of]
 ;W[md]LB[pb:c][ld:b][pf:a]C[Black continues with 'a' or 'b'.
 'c' is a trick play.]
 (;B[pf]
 ;W[lc]LB[nf:a][dp:b]C[
 * Joseki *
 Black continues at 'a'. To play elsewhere ('b') invites White
 to gain influence in the center. 'a' is a junction point for
 both players.]
 (;B[nf]LB[mf:a][dp:b]C[White must continue at 'a'. Black will dominate if White plays elsewhere ('b').]
 (;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[qk])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[me]
 ;W[nd]
 ;B[le]
 ;W[ld]
 ;B[ke]))
 (;B[dp]C[Black plays elsewhere, a mistake.]
 ;W[nf]LB[ng:b][oh:a]C[Black continues at 'a'. The hane of Black 'b' is unreasonable.]
 (;B[oh]
 ;W[ng]
 ;B[ph]LB[qh:b][pi:a]C[Black should not play 17 at 'a', as it leaves 'b' for White to aim at.])
 (;B[ng]C[Black 15 is unreasonable.]
 ;W[og]
 ;B[oh]
 ;W[pg]
 ;B[qf]
 ;W[qg]LB[rf:a][pi:b]C[Black may try 'a' or 'b'.]
 (;B[rf]
 ;W[pi])
 (;B[pi]
 ;W[rf]
 ;B[qe]
 ;W[rh]
 ;B[qi]
 ;W[ri]LB[qb:b][qk:a]C[Black is at a loss for continuation. If Black 'a', White takes Black's eye in the corner with 'b' and Black loses the fight.
 If Black 'b', White 'a'. Black's tactics have not worked out.]))))
 (;B[ld]LB[lc:B][le:A]C['a' is correct. 'b' is a mistake.
+]
 (;W[le]
 ;B[kd]
 ;W[ke]
 ;B[jd]LB[je:A][re:B]C['a' is the modern Korean variation, 'b' a similar older Japanese variation.]
 (;W[je]
 ;B[id]
 ;W[re]
 ;B[qb]
 ;W[qe]
 ;B[ob]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[nc]
 ;W[nd]
 ;B[pa]
 ;W[nb]
 ;B[oa]
 ;W[mb]
 ;B[lc]
 ;W[nf]
 ;B[og]
 ;W[rc]
 ;B[ra]
 ;W[rb]
 ;B[lb]
 ;W[rd]
 ;B[qa]
 ;W[ng]
 ;B[oh]
 ;W[qh]
 ;B[nh]
 ;W[mh]
 ;B[mi]
 ;W[lh]
 ;B[li]
 ;W[kh]
 ;B[qi]
 ;W[rh]
 ;B[oj])
 (;W[re]C[A tesuji.]
 ;B[qb]LB[qe:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[ob]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[nc]LB[nb:B][nd:A]C['a' is joseki. If 'b', a disadvantageous ko.
+]
 (;W[nd]
 ;B[pa]
 ;W[nb]
 ;B[oa]
 ;W[mb]
 ;B[lc]LB[rc:B][nf:A]C[Playing 'a' is important now, playing 'b' now is bad.
+]
 (;W[nf]
 ;B[og]
 ;W[rc]LB[ra:a][lb:c][rb:d][rd:b]C[Black continues with the tesuji of 'a'.
 Black 'b' leads to collapse.
 Black 'c' gives White a favorable ko or huge influence..
 Black 'd' leads to the same ko.
+]
 (;B[ra]LB[rd:B][ng:A]TR[pj]C['a' is usual. 'b' enlargens the White eye space, if there is an additional Black stone, e.g. on the triangled position.
+]
 (;W[ng]
 ;B[oh]
 ;W[qh])
 (;AB[pj]
 ;W[rd]
 ;B[lb]
 ;W[rb]
 ;B[qa]
 ;W[qh]
 ;B[ph]
 ;W[qi]
 ;B[qj]))
 (;B[rd]
 ;W[rb]
 ;B[sd]
 ;W[ra]
 ;B[qa]
 ;W[se])
 (;B[lb]C[Black 33 ends in Black gote, at best.]
 ;W[ra]LB[qa:a][rb:b]C[Black 'a' is correct. Black 'b' leads to an unecessary ko.]
 (;B[qa]
 ;W[rb]
 ;B[ma]
 ;W[rd]
 ;B[na]
 ;W[ng]C[Whtie is alive in the corner and can strongly attack the Black central group.
+]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[nk]
 ;B[rf]C[Later, this is sente for Black.
+]
 ;W[se]
 ;B[rh])
 (;B[rb]C[Black 35 leads to an unnecessary ko.]
 ;W[rd]
 ;B[qa]
 ;W[sb]))
 (;B[rb]
 ;W[rd]LB[lb:A][sb:B]C['a' gises a less bad result than 'b'.
+]
 (;B[lb]
 ;W[sb]
 ;B[qa]
 ;W[ra]
 ;B[sa])
 (;B[sb]
 ;W[ra]
 ;B[lb]
 ;W[qa]
 ;B[sa]
 ;W[qa])))
 (;W[rc]
 ;B[nf]
 ;W[me]
 ;B[ra]))
 (;W[nb]
 ;B[nd]
 ;W[oa]
 ;B[mb]
 ;W[qa]
 ;B[ra]
 ;W[rb]
 ;B[pa]C[The ko is bad for White.
 ]))
 (;W[pf]
 ;B[og]
 ;W[pc]
 ;B[qc]LB[pb:b][qh:a]C[White continues with 'a', or 'b' to prevent connection.]
 (;W[qh]
 ;B[nc]
 ;W[nd]
 ;B[ob]
 ;W[pi])
 (;W[pb]C[White prevents connection of the two Black groups. Played properly by Black, White loses points in the corner.]
 ;B[qe]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[sf]LB[se:c][sg:b][ph:a]C[White continues with 'a'. Capturing the two Black stones ('b' or 'c') leads to a loss for White, as Black throws in at Black
 .]
 ;W[ph]
 ;B[rd]
 ;W[qi]))))
 (;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb]
 ;B[me]
 ;W[nd]
 ;B[nf]))
 (;B[pb]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[nf]
 ;W[mf]
 ;B[mg]
 ;W[lg]C[White avoided being tricked.]
 ;B[mh]
 ;W[rf]
 ;B[rd]
 ;W[oh]
 ;B[nh]
 ;W[oi]
 ;B[lf]
 ;W[me]
 ;B[kf]
 ;W[lc]
 ;B[kh]))
 (;W[qe]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;B[re]
 ;W[rf]
 ;B[rd])
 (;W[md]LB[ld:B][ne:A]C['a' is ok. 'b' is possible.]
 (;B[ne]
 ;W[lc]
 ;B[pf])
 (;B[ld]
 ;W[me]LB[kc:B][pf:A]C['a' is better than 'b'.]
 (;B[pf]
 ;W[ne]
 ;B[of]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb])
 (;B[kc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[qg]
 ;B[pb]
 ;W[of]))))
 (;B[qe]
 ;W[pf]
 ;B[qg]LB[jc:a][qc:b]C[White continues with 'a'. White 'b' takes the corner and tries to avoid a large scale fight.]
 (;W[jc]
 ;B[me]
 ;W[pg]
 ;B[qh]
 ;W[ph]
 ;B[pi]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[rh]
 ;W[re]
 ;B[sg]
 ;W[qc]
 ;B[rd]
 ;W[oi])
 (;W[qc]LB[pd:B][pg:A]C['a' aims to attack the lower right corner, 'b' initiates furikawari.]
 (;B[pg]LB[rc:A][pd:B]C['a' is correct, 'b' possible.]
 (;W[rc])
 (;W[pd]LB[rc:C][rh:A][qi:B]C[Later, 'a' and 'b' are sente aiming at 'c'.]))
 (;B[pd]LB[pc:B][od:A]
 (;W[od]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[qf]LB[ob:a][rf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ob]
 ;W[rg])
 (;B[rf]C[Black cannot afford to play 'b'.]
 ;W[rc]
 ;B[rd]
 ;W[rb]C[White make small life in the corner and has some thickness.]))
 (;W[pc]C[White 10 is a mistake: Black's resulting thickness is excellent.]
 ;B[od]
 ;W[nc]
 ;B[nd]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]))))
 (;B[qg]LB[md:c][me:b][qe:a]C[Black 5 is a trick play.
 White naturally wants to reply at 'a', which is okay given the proper follow-up.
 The light move at 'b' is also feasible. White 'c' is interesting as well.]
 (;W[qe]LB[pd:a][re:b]C[Black may try 'a' or 'b'.]
 (;B[pd]
 ;W[od]
 ;B[re]LB[of:b][rf:a]C[White 'a' is bad. White has to defend with 'b'.]
 (;W[rf]
 ;B[rd]
 ;W[qf]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[qb]
 ;B[rg]LB[sf:a][sg:b]C[White 'a' and 'b' are both bad.]
 (;W[sf]
 ;B[pg]
 ;W[pf]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[nb]
 ;B[nc]
 ;W[oa]
 ;B[nd]
 ;W[ob]
 ;B[ng]
 ;W[rc]
 ;B[nf]
 ;W[sd]
 ;B[og]
 ;W[se]
 ;B[sg]
 ;W[qc])
 (;W[sg]
 ;B[pg]
 ;W[pf]
 ;B[rb]
 ;W[qc]
 ;B[rc]LB[ra:b][nb:a]C[Neither White 'a' nor 'b' work.]
 (;W[nb]
 ;B[se]
 ;W[sf]
 ;B[ra]C[White must find life for the five White stones in the corner.]
 ;W[mb]C[Crawling along the second line is terrible.]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc])
 (;W[ra]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[nb]
 ;B[oa]
 ;W[na]
 ;B[nc]
 ;W[pa]
 ;B[ob]
 ;W[oa]
 ;B[nd])))
 (;W[of]
 ;B[rc]C[Black 11 is necessary.]
 ;W[ld]C[White gets thick with 12.]))
 (;B[re]LB[md:c][pd:a][ne:b][rf:d]C[White continues with 'a' or 'b'.
 Shusaku played White 'c' when Ota Yuzo played this trick play against him. An exchange results, but the position is not desirable for either player.
 White must not hane at 'd'.]
 (;W[pd]
 ;B[rd]
 ;W[qc]
 ;B[rc]
 ;W[qb])
 (;W[ne]
 ;B[rc]
 ;W[ld])
 (;W[md]
 ;B[pd]
 ;W[lc]
 ;B[oe])
 (;W[rf]C[White falls into what is known as the "nineteen point trick move".
 White's profit is 19 points in gote, but in the process gives Black walls of steel. The dangerous thing about this trick is that White's moves along the way seem natural.]
 ;B[rd]
 ;W[qf]
 ;B[pd]
 ;W[od]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[qb]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[nb]
 ;B[nc]
 ;W[oa]
 ;B[nd]
 ;W[ob]
 ;B[rg]
 ;W[sf]
 ;B[pg]
 ;W[pf]
 ;B[ng]
 ;W[rc]
 ;B[og]
 ;W[qc]
 ;B[nf]
 ;W[sd])))
 (;W[me]
 ;B[qe]
 ;W[jd])
 (;W[md]
 ;B[ld]
 ;W[me]
 ;B[nc]
 ;W[nd]
 ;B[kc]
 ;W[qe]
 ;B[ob]
 ;W[pc]))
 (;B[qf]LB[qe:A][pf:B]C[Black 5 is a mistake.]
 (;W[qe]
 ;B[re]
 ;W[pd]LB[qc:a][rd:b]C[Black plays 'a' and surrenders the corner, or 'b' and gives White influence for some territory.]
 (;B[qc]C[Black 9 is a sacrifice.]
 ;W[rf]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc])
 (;B[rd]C[Black 9 aims to keep Black's stones together.]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[qi]
 ;W[pj]))
 (;W[pf]C[White 6 lets Black correct the defect in shape (the gap between Black 1 and 5).]
 ;B[qg]
 ;W[pg]
 ;B[qh])))
 (;W[oe]LB[pc:c][pf:a][pg:d][qg:b]C[The one-space jump of White 4 is the smoothest move and is very common in actual play. White 4 is a good start to a counter attack.
 Black continues with 'a'.
 Black 'b' is slow.
 Black 'c' is a trick play.
 Black 'd' is an overplay.]
 (;B[pf]LB[qc:c][ld:a][ph:b]C[Black 5 is the only possible good response by Black. White continues with 'a' or 'b'. White 'b' is servere.
 White 'c' is a trick play.]
 (;W[ld]LB[lc:c][pc:a][md:b]C[Joseki continues with 'a' or 'b'.
 'c' is similar to 'a' and avoids the possibilities of complications.]
 (;B[pc]LB[ob:b][pb:a]C[White continues with 'a' or 'b'. White 'b' can lead to complications.]
 (;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[md])
 (;W[ob]LB[lc:a][md:c][of:b]C[Black continues with 'a' or 'b'. Black should only play 'b' if the right is very important, because Black 'b', White 'a', and White is better off locally.
 Black 'c' is a mistake.]
 (;B[lc]
 ;W[kd]
 ;B[md]
 ;W[me]LB[kc:a][nd:b]C[Joseki continues with 'a'.]
 (;B[kc]
 ;W[jd]LB[ic:a][jc:b][nd:c]C[Black continues with 'a' or 'b'. 'c' is a mistake.]
 (;B[ic]
 ;W[nd]
 ;B[ph]C[
 * Joseki *])
 (;B[jc]LB[id:b][of:a]C[White must play 'a', not 'b'. While White 'a' lets Black extend on the fourth line, a minus for White, White's followup extension at 'b' is a considerable minus for Black, so balance is maintained.]
 (;W[of]LB[id:b][pg:a]C[Black continues with 'a' or 'b'.]
 (;B[pg]
 ;W[id]
 ;B[hc])
 (;B[id]
 ;W[pg]
 ;B[qg]
 ;W[pe]
 ;B[qf]
 ;W[qe]
 ;B[re]
 ;W[qh]C[White's superiority on the right is assured, whatever Black does.
 This variation is a kind of exchange.]))
 (;W[id]C[White 16 is a mistake.]
 ;B[ne]LB[nd:c][pe:a][nf:b]C[After Black 17, there is no way White can salvage the situation.
 White 'a' is about the best response, resulting in a Black ponnuki toward the center.
 White 'b' leaves cutting points, so is hopeless.
 White 'c' looks more promising than it is. Black gets great outside influence.]
 (;W[pe]
 ;B[qe]
 ;W[of]
 ;B[mf]LB[le:b][pg:a]C[White 'a' gives Black a center-facing ponnuki (in sente). White 'b' and White lives in the corner in sente, but mistakes in the order of moves can yield frightening results. Neither result is favorable for White.]
 (;W[pg]
 ;B[qf]
 ;W[og]
 ;B[le])
 (;W[le]
 ;B[od]
 ;W[pd]
 ;B[nd]
 ;W[qc]
 ;B[og]
 ;W[pb]
 ;B[nf]
 ;W[pc]
 ;B[pg]))
 (;W[nf]
 ;B[nd]LB[od:a][of:b]C[White has cutting points at 'a' and 'b'.])
 (;W[nd]
 ;B[nf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[mf]
 ;W[pg]
 ;B[oh]
 ;W[pe]
 ;B[qf]
 ;W[qe]
 ;B[re]C[Black has defects but White is short of liberties.]
 ;W[rf]
 ;B[qg]
 ;W[rd]
 ;B[od]
 ;W[se]
 ;B[pd]
 ;W[re]
 ;B[ph]LB[pb:a]C[Black gets overwhelming outside influence.
 White can play atari at 'a' to squeeze Black to get life in the corner, but this is small compensation for White.])))
 (;B[nd]
 ;W[od]
 ;B[ne]
 ;W[of]
 ;B[mf]
 ;W[pg]))
 (;B[nd]C[Black 13 is not described in the joseki books. Variations are possible, even likely.]
 ;W[od]
 ;B[ne]
 ;W[of]
 ;B[nf]
 ;W[pg]
 ;B[qg]
 ;W[ng]
 ;B[mf]
 ;W[qe]
 ;B[ph]
 ;W[og]
 ;B[re]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[sd]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[sf]
 ;W[pi]))
 (;B[of]
 ;W[lc]C[It is regrettable for Black to let White settle his stones with White 10, so this variation is only playable if Black 9 works extremely well on the right side.])
 (;B[md]LB[lc:a][me:b]C[Black 9 is a mistake.]
 (;W[lc]LB[lb:b][me:a]C[Black may try 'a' or 'b'.]
 (;B[me]
 ;W[mb]
 ;B[of]
 ;W[kb]C[White 14 ensures connection.
 The three Black stones are worthless.])
 (;B[lb]
 ;W[me]
 ;B[kc]
 ;W[le]C[Black's shape is thin.]))
 (;W[me]C[White 10 lets Black get away with the mistake of playing 9.]
 ;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]
 ;B[ic]))))
 (;B[md]
 ;W[me]LB[lc:A][le:B]C['a' is usual. 'b' is disadvantageous.]
 (;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]
 ;B[ic]
 ;W[he]
 ;B[hc]LB[nd:A][ne:B]C[Later, Black cutting on 'a' or 'b' helps White.]
 (;B[nd]
 ;W[ne]
 ;B[od]
 ;W[pe]
 ;B[pd]
 ;W[qe])
 (;B[ne]
 ;W[nf]
 ;B[nd]
 ;W[of]
 ;B[od]
 ;W[pe]
 ;B[qe]
 ;W[pd]
 ;B[pc]
 ;W[qc]
 ;B[pb]
 ;W[rc]
 ;B[ob]
 ;W[qf]))
 (;B[le]LB[lc:a][ke:b][of:c]C[White continues with 'a' or 'b' if the ladder to catch Black 9 is favorable, or with 'c' if the ladder is unfavorable.]
 (;W[lc]LB[lb:b][ne:a]C[Black may try 'a' or 'b'.]
 (;B[ne]
 ;W[mf]
 ;B[nd]
 ;W[nf]
 ;B[od]
 ;W[mb]
 ;B[pc]
 ;W[ke])
 (;B[lb]
 ;W[mb]
 ;B[nb]
 ;W[nc]
 ;B[ma]
 ;W[nd]
 ;B[mb]
 ;W[jc]C[Black must crawl along the second line to live, but this is like trying to lose.]))
 (;W[ke]LB[ne:A][lf:B]C['a' or 'b'.]
 (;B[ne]
 ;W[lf]LB[nd:B][mf:A]C['a' or 'b'.]
 (;B[mf])
 (;B[nd]
 ;W[nf]
 ;B[od]
 ;W[lc]))
 (;B[lf]
 ;W[mf]
 ;B[kd]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[mb]
 ;W[kb]
 ;B[jb]
 ;W[jc]
 ;B[jd]
 ;W[lg]
 ;B[kf]
 ;W[je]
 ;B[id]
 ;W[jf]))
 (;W[of]
 ;B[pg]
 ;W[lc])))
 (;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]
 ;B[md]
 ;W[me]
 ;B[ic]
 ;W[nd]))
 (;W[ph]
 ;B[of]
 ;W[md]LB[lc:A][pc:B]C['a' or 'b'.]
 (;B[lc]
 ;W[nf]LB[ng:a][oh:b]C[Black continues with 'a' or 'b'.]
 (;B[ng]LB[mf:a][og:b]C[White continues with 'a' or the very tough 'b'. White 'b' was introduced by Fujisawa Shuko = Fujisawa Hideyuki in the 1971 Meijin Title against Rin Kaiho.]
 (;W[mf]C[White 6 shows the severity of modern Go. When playing like this, it is desirable to have White stones in the top left corner.]
 ;B[oh]LB[ic:b][pj:a]C[White could continue with 'a' or 'b', depending on the side with support (the right for 'a', the top for 'b').]
 (;W[pj]
 ;B[pc]
 ;W[nc]LB[ic:A][le:B]C['a' or 'b'.]
 (;B[ic]C[
 * Joseki *])
 (;B[le]
 ;W[me]
 ;B[ic]))
 (;W[ic]))
 (;W[og]LB[pe:a][pg:b]C[Black 'a' was played originally in the 1971 Meijin Title: Fujisawa Shuko vs. Rin Kaiho. Subsequent research revealed Black 'b' is better.]
 (;B[pe]
 ;W[mf]
 ;B[nh]
 ;W[pj]
 ;B[pc]
 ;W[od]
 ;B[jd]
 ;W[lg])
 (;B[pg]
 ;W[oh]
 ;B[ne]
 ;W[mf]
 ;B[nd]
 ;W[qc]
 ;B[od]
 ;W[rd]
 ;B[pd]
 ;W[mh]LB[pc:a][re:b]C[The sequence ends. Later, Black may play 'a', or possibly 'b'.]
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[pb]
 ;W[rf]
 ;B[rg]
 ;W[qh]
 ;B[qg]
 ;W[qe]
 ;B[pe]
 ;W[ra])
 (;B[re]
 ;W[pc]))))
 (;B[oh]LB[pe:a][pj:b]C[White continues with 'a' or 'b'.]
 (;W[pe]
 ;B[qe]
 ;W[og]
 ;B[ng]
 ;W[pg]
 ;B[qf]
 ;W[mf]
 ;B[pi]
 ;W[nh]
 ;B[oi]
 ;W[mg]
 ;B[qh]
 ;W[ic])
 (;W[pj]
 ;B[ng]
 ;W[mf]
 ;B[pc]
 ;W[nc]
 ;B[ic])))
 (;B[pc]
 ;W[nc]
 ;B[mf]
 ;W[kd]))
 (;W[qc]LB[rc:b][pd:a]C[White 'c' is a trick play that should not work. Black continues with 'a'. Black 'b' is weak.]
 (;B[pd]LB[nc:b][pc:a]C[White may try 'a' or 'b'.]
 (;W[pc]
 ;B[od]
 ;W[nd]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qg]C[Black gets a superior result.])
 (;W[nc]C[White 8 is not good.]
 ;B[pc]
 ;W[md]
 ;B[lc]C[White has gained nothing.]))
 (;B[rc]C[Black 7 is weak, and lets White succeed.]
 ;W[qb]
 ;B[pd]
 ;W[nc]
 ;B[md]
 ;W[ne])))
 (;B[qg]LB[jc:c][jd:b][pf:a]C[Black 5 is slow.
 White can playing the forcing move of 'a', then settle his shape, or stake out the top with 'b' or 'c' at some risk to the White corner stones.]
 (;W[pf]
 ;B[qf]
 ;W[qc]LB[rc:a][pd:b]C[Black continues with 'a'. Black 'b' is a trick play.]
 (;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]C[White is settled.]
 ;B[jc])
 (;B[pd]LB[pc:B][od:A]C[Black 9 is a trick play.]
 (;W[od]
 ;B[pc]
 ;W[pb]LB[qb:b][rc:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[rc]
 ;W[qb])
 (;B[qb]C[Black 13 is unreasonable.]
 ;W[rc]
 ;B[ob]
 ;W[qe]LB[rd:A][re:B]
 (;B[rd]
 ;W[re])
 (;B[re]C[Black 17 is a mistake.]
 ;W[rd]
 ;B[pa]
 ;W[pe]
 ;B[pb]
 ;W[rf])))
 (;W[pc]C[White 10 is a mistake.]
 ;B[od]
 ;W[nd]
 ;B[nc]
 ;W[rd]
 ;B[qe]
 ;W[ne]
 ;B[kd])))
 (;W[jd]C[White plays a high extension/pincer from the corner.]
 ;B[me]
 ;W[og])
 (;W[jc]C[White plays a low extension/pincer.]
 ;B[pc]LB[ob:a][pb:B][pd:b]C[White continues with 'a' or 'b'.]
 (;W[ob]C[White 8 keeps the Black stones separated.]
 ;B[me]
 ;W[og]
 ;B[je]
 ;W[hc])
 (;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]LB[ld:b][og:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[og]
 ;B[le]
 ;W[lg]
 ;B[je]
 ;W[hc])
 (;W[ld]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[nc]C[White is overconcentrated.]))))
 (;B[pc]LB[ob:b][pb:a]C[Black 5 is a trick play.
 White replies with 'a'. White 'b' is not good.]
 (;W[pb]LB[qb:a][od:b]C[Black may try 'a' or 'b'.]
 (;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg])
 (;B[od]
 ;W[nd]
 ;B[pd]
 ;W[nc]
 ;B[ne]
 ;W[md]
 ;B[nf]
 ;W[qb]))
 (;W[ob]C[White 6 is not recommended.]
 ;B[pf]C[Black plays 7 and Black 5 is left as an effective forcing move.]))
 (;B[pg]LB[nc:a][qe:b]C[Black 4 is an overplay; too thin.
 White continues with 'a'. White 'b' is unreasonable.]
 (;W[nc]LB[md:b][pe:a]C[White 6 looks slow, but it is the move.
 Black may try 'a' or 'b'.]
 (;B[pe]
 ;W[md]C[White 8 makes good shape at top.])
 (;B[md]
 ;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[pf]
 ;W[qc]
 ;B[rd]
 ;W[re]
 ;B[rc]
 ;W[rb]C[White 16 is the tesuji.]
 ;B[qb]
 ;W[pc]
 ;B[ra]
 ;W[sb]))
 (;W[qe]C[White 6 is not recommended.]
 ;B[pd]
 ;W[pe]
 ;B[od]
 ;W[nd]
 ;B[nc]
 ;W[rd]
 ;B[pb]C[Black 13 is the tesuji to save the Black stones.
 This result favors Black.])))
 (;W[md]
 ;B[ld]LB[nd:a][me:b]C[White continues with 'a' or 'b'.]
 (;W[nd]LB[kc:b][qg:a]C[Black continues with 'a' or 'b', though Black should only
 play 'b' with a favorable ladder off 'a'.]
 (;B[qg]
 ;W[lc]
 ;B[kc]
 ;W[lb]LB[kb:b][kd:a]C[Black connects at 'a'. Black 'b' leaves a cutting point (at 'a'), which Black must take care of in gote.]
 ;B[kd]LB[kb:b][mb:a]C[White continues with 'a'. White 'b' is disadvantageous.]
 (;W[mb]C[
 * Joseki *])
 (;W[kb]C[White 12 is a mistake, even with a favorable ladder.]
 ;B[jb]
 ;W[jc]
 ;B[ib]C[Black 15 assuming the ladder does not work.]
 ;W[mb]
 ;B[id]C[Even though Black has ended in gote, Black is solid. White should
 not play this way.]))
 (;B[kc]LB[qe:d][pf:a][qf:c][pg:b][qg:e]C[White continues with 'a', 'b' to 'd'. White must have the ladder to play 'a'.
 White 'e' is not recommended.]
 (;W[pf]LB[pe:b][qf:a]C[White must have the ladder to play this way.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]
 ;W[qg]
 ;B[pg]
 ;W[qe]
 ;B[rf]
 ;W[of]LB[re:a][qh:b]C[Black 'a' is joseki. Black 'b' invites a loss in the corner.]
 (;B[re]
 ;W[ph]
 ;B[qb]
 ;W[og]C[
 * Joseki *])
 (;B[qh]C[Black 15 gives the corner away.]
 ;W[re]
 ;B[rg]
 ;W[pd]))
 (;B[pe]LB[oe:b][of:a]C[Black 9 is not recommended.
 White continues with 'a'. White 'b' is a mistake, as Black gets territory while White builds thickness for nothing.]
 (;W[of]LB[oe:b][qf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[ph]
 ;B[qb]C[Black 15 is necessary to live in the corner.]
 ;W[lf])
 (;B[oe]C[Black 11 is a forcing play that is not recommended.]
 ;W[nf]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le]C[White 16 gets White out of trouble.
 Black]
 ;B[qf]
 ;W[ph]
 ;B[qg]
 ;W[oi]))
 (;W[oe]C[White 8 is a mistake.]
 ;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[ri]C[White's wall is not very useful.])))
 (;W[pg]LB[pc:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pe]
 ;B[rf]
 ;W[qh]C[
 * Joseki *])
 (;B[pe]
 ;W[nf]
 ;B[pc]
 ;W[ob]
 ;B[pb]
 ;W[lf]C[
 * Joseki *]))
 (;W[qf]
 ;B[pf]LB[qe:b][pg:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[pg]
 ;B[pe]LB[mf:b][og:a]C[White continues with 'a' (gote), or 'b' to have sente.]
 (;W[og]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[rf]
 ;W[mf])
 (;W[mf]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[ph]
 ;B[rf]))
 (;W[qe]C[White 10 is unreasonable.]
 ;B[pe]
 ;W[pd]
 ;B[qc]C[It would be hard to kill the two Black stones in the corner.
 If White attempts it, Black will sacrifice them to gain outside thickness. In any event, Black has an easy fight.]))
 (;W[qe]LB[pd:b][re:a]C[Black continues with 'a'. Black 'b' is vulgar.]
 (;B[re]
 ;W[pd]
 ;B[qf]
 ;W[pe]
 ;B[qc]LB[rd:a][rf:b]C[White cuts at 'a' if the ladder to capture 11 is favorable, 'b' if the ladder is unfavorable.]
 (;W[rd]C[White plays 14 when the ladder to capture Black 11 is favorable.]
 ;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[qg])
 (;W[rf]C[White plays 14 when the ladder is unfavorable.]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc]C[White captures the two Black stones in the corner.]))
 (;B[pd]C[Black 9 is a mistake.]
 ;W[pe]LB[od:a][re:b]C[Black 'a' is better than 'b'.]
 (;B[od]
 ;W[oe]
 ;B[nc]
 ;W[rd]LB[ob:c][pb:a][pc:b]C[Black 'a' is best, Black 'b' and 'c' inferior.]
 (;B[pb]
 ;W[qc]
 ;B[pc]
 ;W[qb]
 ;B[ob]
 ;W[qj])
 (;B[pc]
 ;W[pb])
 (;B[ob]
 ;W[qc]))
 (;B[re]
 ;W[rf]
 ;B[oe]
 ;W[od]
 ;B[rd]
 ;W[pg])))
 (;W[qg]C[White 8 is not recommended, as White is split.]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qf]
 ;B[qe]
 ;W[mf]
 ;B[og])))
 (;W[me]C[Attaching and extending is more positive than attaching and drawing back.]
 ;B[nc]LB[od:a][pe:b]C[White continues with 'a' or 'b'. White should have the ladder to play 'b'.]
 (;W[od]LB[ic:d][nd:c][pf:a][qf:b][qg:e]C[White builds influence and aims at attacking Black on both sides.
 Black continues with 'a', 'b', 'c' or 'e'. Black 'd' is not recommended, as the corner stone suffers attack.
 Black 'c' is direct and forceful. Black sacrifices the corner.
 Black must be confident in the fight that follows.]
 (;B[pf]
 ;W[of]
 ;B[pg]LB[qc:B][jd:A]C['a' or 'b'.]
 (;W[jd]
 ;B[le]
 ;W[lf]
 ;B[ke]LB[kb:B][qc:A]C['a' aims for safety, 'b' for a fight.]
 (;W[qc]
 ;B[rc]
 ;W[rd]LB[qb:A][re:B]C['a' is joseki, 'b' is possible.]
 (;B[qb]LB[ob:a][pc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ob]
 ;B[pc]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[jc]
 ;W[mb]
 ;B[id]C[
 * Joseki *])
 (;W[pc]C[White 20 is a mistake.]
 ;B[re]
 ;W[rb]
 ;B[sd]C[White cannot make two eyes, as the following sequence shows.]
 ;W[sb]C[White cannot make two eyes.]
 ;B[ra]
 ;W[pb]
 ;B[qa]))
 (;B[re]
 ;W[qe]
 ;B[sd]
 ;W[pd]
 ;B[rd]
 ;W[pe]
 ;B[qf]))
 (;W[kb]
 ;B[lc]
 ;W[hd]))
 (;W[qc]
 ;B[rc]
 ;W[rd]
 ;B[re]
 ;W[qe]
 ;B[sd]
 ;W[pd]
 ;B[rd]
 ;W[pe]
 ;B[rf]
 ;W[jd]
 ;B[le]
 ;W[lf]
 ;B[ke]))
 (;B[qf]
 ;W[pe]
 ;B[ic]LB[qe:a][pg:b][qh:c]C[White continues with 'a' to 'c'.]
 (;W[qe]
 ;B[re]
 ;W[rd]LB[rc:a][rf:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[qg]
 ;B[qb]
 ;W[pf]C[
 * Joseki *])
 (;B[rf]
 ;W[qc]
 ;B[qj]C[
 * Joseki *]))
 (;W[pg]
 ;B[qh]
 ;W[qe]
 ;B[re]
 ;W[rd]
 ;B[rf]
 ;W[qc])
 (;W[qh]
 ;B[qe]
 ;W[oh]
 ;B[qb]))
 (;B[nd]C[Black 9 is a fighting move.]
 ;W[ne]
 ;B[oe]
 ;W[pe]
 ;B[of]
 ;W[pd]
 ;B[kc]
 ;W[mg]
 ;B[oh]
 ;W[qe]
 ;B[kf]
 ;W[ng]
 ;B[og]
 ;W[mi]
 ;B[oj])
 (;B[ic]C[Black 9 is not recommended. The corner stone comes under attack.]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[qc]
 ;W[kf])
 (;B[qg]
 ;W[pe]LB[ic:B][qe:A]C['a' is correct. 'b' delivers bad news.]
 (;B[qe]
 ;W[jd]
 ;B[le]
 ;W[lf]
 ;B[ke]
 ;W[mg])
 (;B[ic]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[qf]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[pj])))
 (;W[pe]LB[ob:a][qe:b]C[White 8 is somewhat a trick play. This move was researched and used in games around 1910.
 Black continues with the simple 'a', or 'b' to risk a fight.]
 (;B[ob]
 ;W[pc]
 ;B[pb]
 ;W[qc])
 (;B[qe]
 ;W[pf]LB[qf:a][qg:b]C[Black continues with 'a'. Black must not jump to 'b', as he cannot afford the cut.
 White must have the ladder to succeed.]
 (;B[qf]LB[nd:b][pg:a]C[White can play at 'a', but 'b' is preferable.]
 (;W[pg]
 ;B[qh])
 (;W[nd]LB[kc:a][pd:b]C[Black 'a' leads to fighting. Black 'b' sacrifices the two Black stones (3 & 7) for the right.]
 (;B[kc]
 ;W[qh]LB[qc:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[pb]
 ;B[qg]C[The push and cut by Black are unwise.]
 ;W[pg]
 ;B[ph]
 ;W[qi]
 ;B[oh]
 ;W[le])
 (;B[qg]
 ;W[pg]LB[rh:b][qi:a]C[Black continues with 'a'. Black 'b' is cowardly.]
 (;B[qi]
 ;W[rh]
 ;B[ph]LB[pd:a][oh:b]C[Black has 'a' and 'b' available, so the fight should be favorable if missteps are avoided.])
 (;B[rh]C[Black crawls along "the line of defeat".]
 ;W[qi]
 ;B[ri]
 ;W[qj])))
 (;B[pd]
 ;W[od]
 ;B[pg]
 ;W[lc]
 ;B[pb]
 ;W[ob])))
 (;B[qg]C[Black 11 is a mistake.]
 ;W[ob]LB[qb:b][kc:a]C[Neither Black 'a' nor 'b' work if White has the ladder.
 White captures Black 3,7 if Black 'b'.]
 (;B[kc]
 ;W[qf]C[White must have the ladder to play this way.]
 ;B[rf]
 ;W[re]LB[rd:b][rg:a]C[Black 'a' is a mistake. White needs a ladder if Black 'b'.]
 (;B[rg]
 ;W[rd]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pb]
 ;W[qa]
 ;B[ra]
 ;W[pc]
 ;B[pa]
 ;W[qb]
 ;B[qa]
 ;W[pd])
 (;B[rd]
 ;W[rg]
 ;B[se]
 ;W[qh]))
 (;B[qb]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kb]
 ;W[mb]))))))
 (;W[qc]LB[rc:A][pd:B]C[The aim of White's 3-3 contact play is to settle the situation
 quickly.
 'a' is joseki, 'b' another variation.]
 (;B[rc]LB[rb:b][pd:a]C[White continues with 'a'. White 'b' gives Black excellent thickness.]
 (;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]LB[pg:A][qh:B]C['a' is joseki, 'b' is a mistake.]
 (;B[pg]LB[rb:a][dp:b]C[White continues with 'a'. Playing elsewhere ('b') is not recommended, as White is threatened and Black strengthened in sente.]
 (;W[rb]C[
 * Joseki *]
 ;B[qk])
 (;W[]C[White 10, playing elsewhere, is a mistake.]
 ;B[rb]
 ;W[md]
 ;B[ld]
 ;W[nd]
 ;B[kc]
 ;W[pe]
 ;B[pf]
 ;W[nf]))
 (;B[qh]
 ;W[pe]
 ;B[pf]
 ;W[of]
 ;B[pg]TR[mc]C[The marked stone is weakened now.]))
 (;B[qb]
 ;W[qe]
 ;B[pc]LB[pb:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]LB[qc:a][od:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[qc]LB[oe:B][pe:A]C['a' is correct, 'b' is inferior.]
 (;W[pe]
 ;B[ob]
 ;W[qi]C[
 * Joseki *])
 (;W[oe]
 ;B[nd]
 ;W[od]
 ;B[ob]
 ;W[qi]LB[pf:A]C[Black aji on 'a'.]))
 (;B[od]C[Black cuts, but cannot fight the ko. Black 11 is a mistake.]
 ;W[qc]
 ;B[pb]
 ;W[pe]LB[nd:b][oe:a]C[Black continues with 'a' or 'b'.]
 (;B[oe]
 ;W[of]
 ;B[me]
 ;W[qi])
 (;B[nd]
 ;W[qi])))
 (;W[pb]LB[qc:A][pe:B]C[White 10 is a mistake. Black punishes with 'a' or 'b'.]
 (;B[qc]LB[od:B][oe:A][pe:C]C['a', 'b' or 'c' don't help.]
 (;W[oe]
 ;B[pf]
 ;W[pe]
 ;B[nd]
 ;W[od]
 ;B[ph])
 (;W[od]
 ;B[qf]
 ;W[pe]
 ;B[re])
 (;W[pe]
 ;B[nc]))
 (;B[pe]
 ;W[qc]
 ;B[rd]LB[md:a][od:b][oe:c]C[White 'a' is the best move available. White 'b' is not as good, and White 'c' bad.]
 (;W[md]
 ;B[oe]
 ;W[lc]
 ;B[od]
 ;W[nc]
 ;B[pc])
 (;W[od]
 ;B[qf])
 (;W[oe]C[No good will come for White from White 14.]
 ;B[pf]
 ;W[qf]
 ;B[pc]
 ;W[od]
 ;B[qg]
 ;W[pg]
 ;B[of])))))
 (;W[rb]C[White 6 is a mistake. Black gets wonderful thickness.]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[pb]
 ;B[od]
 ;W[nc]
 ;B[nd]))
 (;B[pd]
 ;W[pc]
 ;B[od]
 ;W[nd]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf]
 ;W[ne]
 ;B[kd]))
 (;W[]LB[pc:b][od:a]C[White plays elsewhere. To do so without a favorable ladder is to invite a loss.
 Black continues with 'a' or 'b'.]
 (;B[od]LB[pc:b][pd:a][cq:c]C[White plays 'a' if the ladder is favorable. If the ladder is not favorable, White must play 'b', proving that White should not play elsewhere if the ladder is unfavorable.
 'c' show Black's follow-up if White again plays elsewhere.]
 (;W[pd]LB[pc:b][pe:a]C[Black usually plays 'a'. Black can play 'b' in which case a ladder is helpful but not required.
+]
 (;B[pe]
 ;W[pc]
 ;B[nd]
 ;W[qc]LB[qe:A][re:B]C['a' or 'b'.]
 (;B[qe])
 (;B[re]LB[rc:a][rd:b]C[White continues with 'a' (joseki). White 'b' is sente, but risky.]
 (;W[rc]C[
 * Joseki *
 White plays 12 to ensure life in the corner.])
 (;W[rd]C[White 12 is not recommended.]
 ;B[qe]
 ;W[cq]C[White plays elsewhere.]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[sb]
 ;B[pa]C[Black 19 is a tesuji.]
 ;W[nb]
 ;B[mb]
 ;W[oa]LB[ma:b][nc:a][oe:c]C[Black can now play 'a' and 'b' in sente. The value of the cutting point at 'c' has disappeared.])))
 (;B[pc]
 ;W[pe]LB[qc:A][oe:B]C['a' if the ladder works, 'b' if not.
+]
 (;B[qc]
 ;W[nd]
 ;B[ob]
 ;W[oe])
 (;B[oe]
 ;W[qc]
 ;B[pb]
 ;W[of]
 ;B[nf]LB[qe:A][pf:B]C['a' is possible, but gives Black sente. If White has a position in the upper left corner, White might prefer taking sente with 'b'.
+]
 (;W[qe]
 ;B[rd]
 ;W[pf]
 ;B[rc]
 ;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[oh]LB[qk:A]C[If White has a position on the right side the result might be nice, but if not, a Black approach on or near 'a' puts White in an inferior position.
+]
 ;B[qk])
 (;AW[ec][cd]
 ;W[pf]
 ;B[rc]
 ;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[lg]
 ;B[kf]
 ;W[kg]
 ;B[jf]C[Pushing Black to sixth-line-territory is ok, if its already reduced by the White stones in the upper left.
+]
 ;W[qn]C[Somewhere here, White plays a very far extension.
 ]))))
 (;W[pc]
 ;B[pd]LB[nc:b][qc:a]C[White continues wtih 'a'. White 'b' only makes the loss greater.]
 (;W[qc]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;W[nc]C[White 8 is a mistake.]
 ;B[nd]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[qc]))
 (;W[]C[White plays elsewhere again.]
 ;B[nc]LB[pc:a][qc:b]C[White 'a' is answered by Black 'b'.]))
 (;B[pc]
 ;W[od]
 ;B[pf]
 ;W[ne]
 ;B[ph]
 ;W[ld]
 ;B[jc]LB[ic:a]C[Black trying to put Black 3 into play is greedy. Black 11 or
 'a' is recommended.]
 ;W[lc]))
 (;W[ne]LB[od:b][pf:a]C[White 4 appeared in the late 1920's, but the move is odd, hardly joseki. Black continues 'a' or 'b'.]
 (;B[pf]LB[qc:b][ld:a]C[White continues with 'a' or 'b'.]
 (;W[ld]
 ;B[pc]
 ;W[od]
 ;B[ph])
 (;W[qc]LB[rc:b][pd:a]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[pd]
 ;W[pc]
 ;B[od]LB[nc:b][nd:a][pj:c]C[If White 'a' and Black 'b', White has to go back and make the corner alive. Consequently, White will leave things as they are and play 'c' to erase Black's thickness, but it is enough for Black to push through at 'a'.])
 (;B[rc]C[Black 'b' is submissive.]
 ;W[pd]
 ;B[qe]
 ;W[ld])))
 (;B[od]
 ;W[nd]
 ;B[nc]
 ;W[pd]
 ;B[oe]
 ;W[pe]
 ;B[of]
 ;W[pc]
 ;B[pf]
 ;W[qe]
 ;B[qf]LB[re:b][mf:a]C[If Black plays 'a' instead of 15, White turns at 15, increasing his territory, and this result is not necessarily favorable for Black. If White 'b' in answer to Black 11, then Black 'a' is alright.]
 ;W[lf]
 ;B[re]
 ;W[rd]
 ;B[rf]
 ;W[rc]
 ;B[kd]
 ;W[nf]
 ;B[qj]C[Black 21 and 23 apply pressure on both sides to White's floating stones. With 23 Black gets territory equal to White's corner and can torment White's center stones for more profit.]))
 (;W[pd]LB[qc:a][qe:b]C[White 4 is not joseki.
 'a' is correct, 'b' fails to punish the mistake.]
 (;B[qc]
 ;W[qe]
 ;B[pe]LB[oe:b][re:a]C[The cut punishes because White can't kill the corner.
 White may try 'a' or 'b'. Neither work.]
 (;W[re]
 ;B[ob]C[After Black 9, there is nothing White can do to cause a favorable result.]
 ;W[nb]
 ;B[pb]
 ;W[nc]
 ;B[rd]
 ;W[rb]
 ;B[qb]
 ;W[ra]
 ;B[oa]
 ;W[sc]
 ;B[sd]LB[qa:a][rc:b]C[White's corner stones die. Neither 'a' nor 'b' works for White.]
 (;W[qa]
 ;B[sb])
 (;W[rc]
 ;B[qa]))
 (;W[oe]
 ;B[pf]
 ;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[pg]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[pc]
 ;W[od]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[nc]
 ;B[rh]
 ;W[sd]
 ;B[sg]
 ;W[sc]
 ;B[rb]
 ;W[sb]
 ;B[qa]
 ;W[oa]
 ;B[rf]))
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[pg]
 ;W[rb]LB[mc:3]C[Black failed to use 3 to put White in trouble.])))
 (;B[lc]LB[qb:j][qc:c][ld:g][nd:e][pd:k][me:f][oe:i][pe:b][of:a][qg:d][dp:h]C[
 Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
 ---------------------------------------------------------------
 The low two-space pincer used to be the most popular. With modern Go emphasis on influence, the two-space high pincer has replaced it.
 Possible White reponses range from 'a', 'b', 'c', 'd', 'e' to 'g', or elsewhere 'h'. White must have the ladder to play 'd' or play elsewhere (h8).
 Note, in contrast to the one-space pincer, the one-space jump (shown at 'i') is not joseki.
 'j' and 'k' are mistakes.
 k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1 - White pincer at top; White gets out
 b2, c3 - different outcomes
 d4 - White takes the right
 e5 - White gets out, takes part of the corner
 f6 - White takes the right
 g7 - initial loss, generally White takes the right
+]
 (;W[of]LB[oe:B][qg:A]C['a' or 'b' are ok.]
 (;B[qg]LB[ic:A][jc:B]
 (;W[ic]
 ;B[me]LB[qc:a][pd:b]C[Black 7 is a vital point.
 White continues with 'a' or 'b'. Many continuations are the same as with the two-space high pincer; consult those variations.])
 (;W[jc]LB[le:A][me:B]C['a' or 'b'.]
 (;B[le]LB[qc:B][pd:A]C['a' is joseki, 'b' is a mistake.]
 (;W[pd]LB[qc:A][qe:B]C['a' or 'b'.]
 (;B[qc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[rd]
 ;W[oh])
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]))
 (;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[oe]
 ;B[ob]TR[jc][le]C[The exchange of the triangled stones is now bad for Black.]))
 (;B[me])))
 (;B[oe]
 ;W[ne]
 ;B[pe]
 ;W[mc]LB[mb:C][ld:B][nf:A]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[nf]
 ;W[me]
 ;B[og]
 ;W[ld])
 (;B[ld]
 ;W[nf]
 ;B[nd]
 ;W[md]
 ;B[od]
 ;W[le])
 (;B[mb]
 ;W[ld]
 ;B[nf]
 ;W[me]
 ;B[og]
 ;W[kc]
 ;B[lb]
 ;W[kb]
 ;B[nc]
 ;W[nb]
 ;B[md]
 ;W[nd]
 ;B[mc]
 ;W[ma])))
 (;W[pe]LB[pd:b][qe:a]C[The White pressing move was popular in Edo period (1600-1867) games. White aims to build influence then attack with a pincer of his own. The idea is the same as the two-space jump, but more forceful.
 Black continues with 'a' or 'b'. 'b' leads to a difficult
 joseki.]
 (;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[jc]
 ;B[le]LB[je:b][pg:a]C[
 * Joseki *
 White continues with 'a' or 'b'.]
 (;W[pg]
 ;B[qh]
 ;W[ph]
 ;B[pi]
 ;W[oi]LB[oj:b][pj:a]C[Black continues with 'a' or 'b'.]
 (;B[pj]
 ;W[qf]
 ;B[rf]
 ;W[rg]LB[re:a][rh:b]C[Black continues with 'a' or 'b'.]
 (;B[re]
 ;W[je]
 ;B[lg]
 ;W[nh])
 (;B[rh]
 ;W[re]
 ;B[sg]
 ;W[qc]
 ;B[rd]
 ;W[je]))
 (;B[oj]
 ;W[qf]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[qc]LB[rd:a][ni:b]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[pj]
 ;B[qi]
 ;W[ni]
 ;B[je])
 (;B[ni]
 ;W[rd]
 ;B[oh])))
 (;W[je]LB[ne:a][lg:b]C[Black continues with 'a' (joseki). Black 'b' allows White good shape.]
 (;B[ne]LB[pd:b][qf:a]C[White continues with 'a'. White gets sealed in if he plays 'b'.]
 (;W[qf]
 ;B[rf]
 ;W[pg]LB[pd:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[od]
 ;B[oe]
 ;W[rg]
 ;B[re]
 ;W[qh])
 (;B[qh]
 ;W[pd]
 ;B[qc]C[Black 17 is a strategic point.]
 ;W[md]))
 (;W[pd]C[White 12 is a mistake.]
 ;B[pg]
 ;W[qf]
 ;B[rf]
 ;W[qc]
 ;B[og]
 ;W[rc]))
 (;B[lg]C[Black 11 is slack.]
 ;W[nf])))
 (;B[pd]
 ;W[od]
 ;B[oe]LB[qe:b][pf:a]C[Neither side can afford a mistake. White continues with 'a'. White 'b' is a mistake.]
 (;W[pf]LB[nd:c][ne:b][of:a]C[White 8 is the only move.
 Black continues with 'a', not 'b'. 'c' is inferior.]
 (;B[of]C[Black 9 is the only move.]
 ;W[pg]
 ;B[og]LB[re:a][ph:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]LB[pc:b][rd:a]C[Black continues with 'a' or 'b'.]
 (;B[rd]LB[qb:b][pc:a]C[White continues at 'a'. White 'b' is slack.]
 (;W[pc]LB[qb:b][qc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[rf]
 ;W[qe]
 ;B[se]
 ;W[ph]
 ;B[nd]
 ;W[sc]
 ;B[sd]
 ;W[ra]
 ;B[sb]
 ;W[nc]
 ;B[mc]
 ;W[rg]
 ;B[nb]
 ;W[ob]
 ;B[na]
 ;W[oa]
 ;B[lb]
 ;W[ne]
 ;B[md]
 ;W[qf]
 ;B[mf]
 ;W[sf]
 ;B[rc]C[The result in the corner is a seki. The result overall is considered slightly favorable to White.])
 (;B[qb]C[Black 15 is a mistake.]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[qa]
 ;W[sd]C[White wins by throwing in at White 18 after Black captures.]))
 (;W[qb]C[White 14 is a mistake. Black discards the corner for superior thickness.]
 ;B[ph]
 ;W[rf]
 ;B[rb]
 ;W[qc]
 ;B[rc]
 ;W[ra]
 ;B[md]LB[pc:a][qh:b]C[White must play 'a', not another move (such as 'b').]
 (;W[pc]
 ;B[oi])
 (;W[qh]C[White 22 is a mistake.]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[nb]
 ;B[oa]
 ;W[na]
 ;B[nc]
 ;W[pa]
 ;B[ob]
 ;W[oa]
 ;B[nd]
 ;W[ob]
 ;B[mb])))
 (;B[pc]
 ;W[md]
 ;B[ph]
 ;W[qh]
 ;B[qi]
 ;W[rd]
 ;B[ob]
 ;W[mc]
 ;B[qb]
 ;W[rh]
 ;B[ri]
 ;W[rg]
 ;B[rc]
 ;W[nb]
 ;B[oa]LB[sb:A][mf:B]C['a' is necessary, just playing 'b' without it is failure.]
 (;W[sb]LB[sc:b][oh:a]C[A tesuji by White, ensuring life for the group on the right side.
 Joseki continues with Black 'a'. Black 'b' doesn't work as a life threat against the White group.]
 (;B[oh]C[Black does not need to answer, so reinforces at Black 29.]
 ;W[jc]C[
 * Joseki *])
 (;B[sc]
 ;W[mf]
 ;B[oh]
 ;W[jc]
 ;B[sh]
 ;W[qe]
 ;B[sd]
 ;W[se]
 ;B[rb]
 ;W[sg]))
 (;W[mf]
 ;B[oh]
 ;W[jc]
 ;B[qf]
 ;W[qe]
 ;B[sd]
 ;W[se]
 ;B[sh]
 ;W[sb]
 ;B[rb])))
 (;W[ph]C[White 12 is a mistake.]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[qb]
 ;B[rb]
 ;W[ne]
 ;B[md]
 ;W[oh]
 ;B[mf]
 ;W[ra]C[White sets up a ko he cannot win.]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[pa]
 ;B[qa]
 ;W[ng]
 ;B[nf]
 ;W[qb]
 ;B[ob]
 ;W[nb]
 ;B[qa]))
 (;B[ne]C[Black 9 is a mistake.]
 ;W[pb]
 ;B[rf]
 ;W[md]LB[mc:b][nd:a]C[If Black 'a', White gives way with 'b'. Black has a difficult fight ahead.])
 (;B[nd]LB[nd:9]C[Black 9 is a recent variation, whose outcome is not as favorable to Black as the joseki of Black 9 onto the marked point, as White gets better thickness to the right.
 Black requires a favorable ladder to the lower left to play Black 9.
 The sequence that follows is complex. A miscalculation on either side could have disasterous consequences.]MA[of]
 ;W[nc]
 ;B[md]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[ne]
 ;B[of]
 ;W[pg]
 ;B[rc]
 ;W[mc]
 ;B[ld]
 ;W[ng]C[White 24 would be played only if White did not have a favorable ladder to capture the two Black stones.]
 ;B[nf]
 ;W[mf]
 ;B[me]
 ;W[og]
 ;B[ne]
 ;W[lb]
 ;B[kb]
 ;W[la]
 ;B[jc]
 ;W[ra]
 ;B[sd]
 ;W[nb]))
 (;W[qe]C[White 8 is unreasonable.]
 ;B[re]LB[rd:b][rf:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[rf]
 ;B[rd])
 (;W[rd]C[White 10 was played by Kitani Minoru (White) against Mukai Kazuo (Black) in April 1924.]
 ;B[rc]
 ;W[qc]
 ;B[sd]
 ;W[pc]
 ;B[rd]
 ;W[pg]
 ;B[ne]
 ;W[qg]
 ;B[rb]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[nd]
 ;W[mc]
 ;B[nc]
 ;W[nb]
 ;B[ob]LB[lb:a][pb:b]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[lb]
 ;B[na]
 ;W[mb]
 ;B[pb])
 (;W[pb]
 ;B[mb]
 ;W[oa]LB[kb:b][kd:a]C[Black continues with 'a' if the ladder is favorable, 'b' if not.]
 (;B[kd]C[Black must have the ladder to play this way.])
 (;B[kb]
 ;W[le]
 ;B[mg]
 ;W[qa]
 ;B[jc]C[Black lets White live in the corner.]
 ;W[qb]
 ;B[rg]C[Black 37 to ensure life.
 White has two floating groups to look after in the fighting ahead.]))))))
 (;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]
 ;B[pg]LB[rb:a][nd:d][qk:b][dp:c]C[
 * Joseki *
 White continues with 'a' or 'b'. If Black 'a', White 'd' to make
 shape.
 Playing elsewhere ('d'), gives Black an opportunity.]
 (;W[rb])
 (;W[qk]
 ;B[rb]
 ;W[nd])
 (;W[]LB[rb:b][nd:a]C[White plays elsewhere. 'a' and 'b' are miai.]
 (;B[nd]C[Black emphasizes the center.]
 ;W[pe]
 ;B[pf]
 ;W[rb]LB[oe:a][mf:b]C[If White 'a', Black 'b'.])
 (;B[rb]
 ;W[nd])))
 (;B[qb]LB[pe:b][qe:a]C[Black 7 is possible, although Black drawing back at 'a' is more common with the low two-space pincer.
 White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pc]
 ;W[rd]LB[qc:a][od:b]C[Joseki continues with Black 'a'. Black 'b' is less favorable.]
 (;B[qc]
 ;W[oe]LB[nb:c][ob:a][nc:b]C[Black will leave the corner. Playing Black 'a', White 'b', Black 'c' is too low ("the second line is the line of defeat").])
 (;B[od]
 ;W[qc]
 ;B[pb]
 ;W[pe]
 ;B[nc]
 ;W[oe]
 ;B[nd]
 ;W[qi]LB[rb:a]C[White also has the cut at 'a' to look forward to.]))
 (;W[pe]C[White must have the ladder to play this way.]
 ;B[pc]
 ;W[pb]
 ;B[qc]
 ;W[qf]
 ;B[ic]
 ;W[nd])))
 (;W[qg]LB[od:b][pe:a]C[White must have the ladder to play this way. Black continues with 'a' or 'b'.]
 (;B[pe]
 ;W[qj]LB[pc:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[qb:a][dp:b]C[
 * Joseki *
 Although the White stone is sealed in, it is not yet dead because White can play 'a'. The ensuing sequence will make Black thick, however, so timing is important.
 Variation 2 ('b') show White playing elsewhere.]
 (;W[qb]LB[rb:b][nc:a][rc:c]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[nc]LB[ob:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]
 ;B[ob]
 ;W[re])
 (;W[ob]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[od]
 ;B[oe]
 ;W[nb]
 ;B[mb]
 ;W[qc]
 ;B[re]
 ;W[pa]))
 (;B[rb]
 ;W[rc]LB[pb:a][qc:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pb]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pc]
 ;W[re])
 (;B[qc]C[Black 11 is a mistake.]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pb]
 ;W[sa]
 ;B[pc]
 ;W[rf]))
 (;B[rc]C[Black 9 is a mistake. Black cannot capture White.]
 ;W[mb]
 ;B[lb]
 ;W[od]
 ;B[oe]
 ;W[rb]
 ;B[sb]
 ;W[qc]
 ;B[re]
 ;W[nc]
 ;B[mc]
 ;W[ma]))
 (;W[]C[White plays elsewhere.]
 ;B[rd]LB[pc:a][re:b]C[Black 8 is quite big. 'a' instead of 1 is solid but Black becomes over concentrated. Black 1 at 'b' has been seen.]))
 (;B[pc]C[Black 7 is territory oriented.]
 ;W[pb]
 ;B[qb]
 ;W[of]LB[rc:a]C[White 10 works on a moyo. White 8 was a throw away, leaving 'a' as a peep.]
 ;B[nd]))
 (;B[od]LB[pd:a][qj:b]C[White 'a' is joseki. White 'b' is disadvantageous.]
 (;W[pd]LB[pc:b][pe:a]C[White must have the ladder. If so, Black plays 'a'. If White does not have the ladder, Black plays 'b'.]
 (;B[pe]
 ;W[pc]LB[qc:c][oe:b][re:a]C[Black 'a' is tesuji (and joseki). Black 'b' and 'c' result in a loss.]
 (;B[re]LB[mc:a][nd:b]C[White continues with 'a' or 'b'.]
 (;W[mc]LB[ld:a][nd:b]C[Black continues with 'a' or 'b'.]
 (;B[ld]LB[me:a][oe:b]C[White 'b' is joseki. White 'b' leads to difficulty.]
 (;W[me]LB[qc:a][oe:b]C[Black continues with 'a' to establish a base. Black 'b' is heavy.]
 (;B[qc]
 ;W[oe]
 ;B[of]
 ;W[nd]
 ;B[pf])
 (;B[oe]C[Black 13 is heavy.]
 ;W[md]))
 (;W[oe]
 ;B[nd]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[of]LB[jd:b][mf:a]C[White continues with 'a' or 'b'.]
 (;W[mf]
 ;B[id])
 (;W[jd]
 ;B[mf]C[Black discards the two stones.])))
 (;B[nd]C[Black plays 11 if the ladder favors him.]
 ;W[md]
 ;B[nc]
 ;W[nb]
 ;B[ob]
 ;W[lb]
 ;B[pb]
 ;W[mf]))
 (;W[nd]C[White 10 is a fighting move.]
 ;B[oe]
 ;W[ne]
 ;B[nf]
 ;W[ld]
 ;B[kd]
 ;W[le]
 ;B[mc]
 ;W[nc]
 ;B[qb]
 ;W[id]))
 (;B[oe]C[Black 9 is a mistake.]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[rd]
 ;B[pg])
 (;B[qc]C[Black 9 is a mistake.]
 ;W[qe]))
 (;B[pc]C[Black plays 7 if the ladder is not favorable to White. White is in serious trouble if White does not have the ladder.]
 ;W[pe]
 ;B[qc]LB[nd:a]C[White plays 'a' if the ladder is favorable, in which case Black has made a mistake.]
 ;W[nd]
 ;B[ob]C[Black must play 11 if the ladder works for White, though the
 result favors white.]
 ;W[nc]
 ;B[nb]))
 (;W[qj]C[White 6 is not recommended.]
 ;B[pc]C[Black has a better result locally.])))
 (;W[nd]LB[pc:b][le:c][oe:D][pf:a]C[Black continues with 'a' or 'b'. Black 'c' is not recommended, as White squeezes the corner stone. Black 'd' is not recommended, as White easily settles.]
 (;B[pf]LB[qb:A][qc:B]C['a' is ok, 'b' is questionable.]
 (;W[qb]
 ;B[qj]C[
 * Joseki *]
 ;W[dp]LB[me:a]C[White plays elsewhere.
 Black may continue at 'a' to press White and build a moyo. The drawback is the at stones on the right becomes weakened.]
 ;B[me]
 ;W[ne]
 ;B[mf]
 ;W[nf]
 ;B[mg])
 (;W[qc]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]))
 (;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pe]
 ;B[qf])
 (;B[le]LB[pe:b][pf:a][qf:c]C[Black 5 is not recommended.
 White continues with 'a'. White 'b' is a mistake. White 'c' is an overplay.]
 (;W[pf]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[qe])
 (;W[pe]C[White 6 lets Black live on the right side.]
 ;B[qe]
 ;W[pf]
 ;B[qg])
 (;W[qf]C[White 6 is an overplay.]
 ;B[pe]C[White loses control of the situation.]))
 (;B[oe]LB[qb:a][ne:b]C[White easily settles into the corner with 'a'. White 'b' is a
 bad move.]
 (;W[qb]LB[me:b][pj:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pj]C[This is not a favorable result for Black. Black is loose on the right, and with the White group secure, the pincer of Black 3 is subject to attack.])
 (;B[me]C[Black 7 is unreasonable.]
 ;W[ne]
 ;B[nf]
 ;W[md]
 ;B[ld]
 ;W[of]))
 (;W[ne]C[White 6 is a mistake, as Black gets good shape on both sides.]
 ;B[of]
 ;W[le]
 ;B[jd])))
 (;W[me]LB[nd:c][od:a][le:b][pe:d]C[The gap at 'c' is intentional. Black playing there (variation 'c') is just what White wants.
 Black continues with 'a' or 'b'.
 Black 'c' and 'd' are not recommended.
 d4, c3, b2, a1]
 (;B[od]LB[mc:a][nd:b]C[White 'a' is joseki. White 'b' gives bad shape.]
 (;W[mc]LB[pc:a][ld:b]C[Joseki continues with Black 'a'. Black 'b' is a potential mistake.]
 (;B[pc]
 ;W[ld]LB[kc:b][nc:a]C[As for continuation, Black 'a' is recommended. Black cannot easily move out with 'b'.]
 (;B[nc])
 (;B[kc]C[Black 9 is not recommended.]
 ;W[id]))
 (;B[ld]LB[md:b][pd:a]C[White continues with 'a' . White 'b' is a mistake.]
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[oe]
 ;W[md]
 ;B[qc]
 ;W[jd]
 ;B[ke]
 ;W[mg])
 (;W[md]C[White 8 is a mistake.]
 ;B[pc]
 ;W[jd]
 ;B[ke]C[White's stones are weak all over.])))
 (;W[nd]C[White 6 is a mistake.]
 ;B[oe]
 ;W[pc]
 ;B[qc]CR[ne]LB[nc:b][ld:a]C[White 4 should be at the red dot.
 Black now has an effective move at 'a', aiming at the cut at 'b'. White lacks a good continuation.]))
 (;B[le]
 ;W[lf]
 ;B[ke]
 ;W[md]
 ;B[qg]
 ;W[ld]
 ;B[kd]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[id])
 (;B[nd]LB[md:b][pe:a]C[This is not joseki.
 White continues with 'a'. White 'b' is a hurried mistake.]
 (;W[pe]LB[od:c][ne:b][qe:a]C[Black 'a' is better than 'b'. Black 'c' is foolishly suicidal.]
 (;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[ne])
 (;B[ne]LB[pd:a][qe:b]C[Black 7 is not recommended.
 White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[qe]
 ;W[qf]
 ;B[qc]
 ;W[pf])
 (;W[qe]
 ;B[mf]
 ;W[rd]C[White 10 secures a large corner.]))
 (;B[od]C[Black 7 is a mistake.]
 ;W[pd]
 ;B[pc]
 ;W[nc]
 ;B[md]
 ;W[qc]
 ;B[pb]
 ;W[qb]))
 (;W[md]C[White 6 is a mistake.]
 ;B[nc]
 ;W[mc]
 ;B[mb]
 ;W[lb]
 ;B[ob]
 ;W[kc]
 ;B[of]C[Black 13 yields a huge corner. This is a great result for Black.]))
 (;B[pe]C[Black 5 is slow.]
 ;W[mc]
 ;B[ld]
 ;W[md]
 ;B[hc]
 ;W[qb]))
 (;W[ld]LB[mc:b][kd:a][md:c]C[Black continues with 'a' if the top is favored, and yields a good result. Black 'b' is balanced. Black 'c' is also possible;
 Black should have the ladder to play 'c'.]
 (;B[kd]C[White 4 is peculiar to the 2-space low pincer. As it has the drawback of an initial loss, it is seldom played.]
 ;W[mc]
 ;B[kc]LB[pf:a][qf:d][pg:b][qg:c]C[White continues with 'a', 'b' or 'c'. White must have the ladder to play 'a'. 'd' is a mistake.]
 (;W[pf]LB[pc:c][od:d][pe:b][qf:a]C[Black continues with 'a' to 'c'. Black 'd' is bad style.]
 (;B[qf]
 ;W[qg]
 ;B[pg]
 ;W[qe]
 ;B[rf]
 ;W[of]
 ;B[re]
 ;W[ph]C[White must have the ladder to play 16.]
 ;B[pb]
 ;W[og]C[
 * Joseki *])
 (;B[pe]
 ;W[oe]
 ;B[qf]LB[pd:a][pg:b]C[White continues with 'a', not 'b'.]
 (;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[pg]
 ;W[of]LB[qb:b][rd:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[rd])
 (;B[qb]C[Black 19 is an overplay.]
 ;W[pc]
 ;B[sb]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[ra]
 ;W[qi]C[White 8 is a tesuji.]
 ;B[og]
 ;W[rh]))
 (;W[pg]C[White 12 gives Black territory and White influence that is negated by the three Black stones on the side.]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[qj]))
 (;B[pc]
 ;W[oe]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qi])
 (;B[od]C[Black 9 approaches an enemy concentration needlessly.]
 ;W[pc]
 ;B[pd]
 ;W[nd]LB[qc:b][le:a]C['a' and 'b' are miai; either gives White good shape.]))
 (;W[pg]
 ;B[pe]
 ;W[me]
 ;B[pc]
 ;W[ng]LB[rg:a]C[A followup Black move at 'a' is big.])
 (;W[qg]
 ;B[pf]LB[qc:a][pg:b]C[White continues with 'a'. White 'b' splits White into two groups while Black solidifies.]
 (;W[qc]LB[rc:b][qf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]
 ;W[pd]
 ;B[re]
 ;W[rd]
 ;B[sd]
 ;W[qe]
 ;B[rg]C[
 * Joseki *])
 (;B[rc]C[Black 11 is not recommended.]
 ;W[pd]
 ;B[qe]
 ;W[pg]
 ;B[of]
 ;W[le]LB[qb:a]C[If Black plays 'a', White fights the ko.]))
 (;W[pg]
 ;B[of]LB[le:a][qf:b]C[White may try 'a' or 'b'.]
 (;W[le]
 ;B[pc]
 ;W[od]
 ;B[qf])
 (;W[qf]
 ;B[od]
 ;W[pc]
 ;B[pd]
 ;W[md]
 ;B[qc]
 ;W[lf]
 ;B[og])))
 (;W[qf]
 ;B[pe]
 ;W[pf]
 ;B[oe]))
 (;B[mc]
 ;W[oe]LB[kd:b][pf:a]C[Black continues with 'a'. Black 'b' is playable only if it works well with the top-left, as the top-right corner and right side suffers.]
 (;B[pf]
 ;W[kd])
 (;B[kd]
 ;W[qf]))
 (;B[md]
 ;W[mc]LB[lc:3][mc:6][ld:4][md:5]C[Same variation of Black 5 and White 6 played before Black 3 and White 4, see there for continuation.]))
 (;W[]LB[pc:b][od:a]C[White plays elsewhere. White must have the ladder to play this way. Black continues with 'a' or 'b'.]
 (;B[od]LB[pc:c][nd:b][pd:a]C[White continues with 'a' if the ladder is favorable, or 'b' if not. White 'c', avoiding the ladder, gives black magnificant thickness.]
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[nd]
 ;W[qc]
 ;B[re]LB[rb:A][nc:C][rc:B]C[Both 'a' and 'b' live, but only 'a' is joseki. White 'c' is the older form of this joseki, and can lead to less favorable results.]
 (;W[rb]C[
 * Joseki *
 White is alive and can tenuki.]
 ;B[nc]C[White still can tenuki.]
 ;W[]
 ;B[rc]
 ;W[sc]
 ;B[rd]
 ;W[qa]LB[of:B][qf:A]C[White has kikashi on 'a' and 'b'.])
 (;W[rc]
 ;B[nc]
 ;W[]
 ;B[ob]
 ;W[pb]
 ;B[nb]
 ;W[rd]
 ;B[qe]
 ;W[ra]LB[rc:12][qf:A]C[Because of White 12, White does not now have the kikashi on 'a'.])
 (;W[nc]LB[mc:a][rc:c][md:b]C[Black continues with 'a' to 'c'. The difference between 'a' and 'b' is the possibility of cutting points.]
 (;B[mc]
 ;W[rc])
 (;B[md]
 ;W[rd]C[White 14 lets White live in sente. Since he cannot cut (because of Black 13), making Black solid outside with White 14 does not matter.]
 ;B[qe])
 (;B[rc]C[Black 14 forces White low.]
 ;W[mc]
 ;B[md]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc])))
 (;W[nd]
 ;B[nc]LB[mc:a][pd:b]C[White continues with 'a'. White 'b' is a vulgar mistake.]
 (;W[mc]
 ;B[nb]
 ;W[pd]
 ;B[oe]
 ;W[pe]
 ;B[pc]
 ;W[of]LB[ob:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]
 ;W[qc]
 ;B[ob]
 ;W[qe]
 ;B[pf]
 ;W[rd]
 ;B[pg]
 ;W[rg])
 (;B[ob]
 ;W[ne]
 ;B[oc]
 ;W[nf]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]))
 (;W[pd]C[White 8 is a mistake.]
 ;B[oe]
 ;W[pc]
 ;B[pe]
 ;W[nb]
 ;B[mc]LB[qc:a][qe:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[qc]
 ;B[re]
 ;W[rd]
 ;B[qe])
 (;W[qe]C[White 14 doesn't work.]
 ;B[qc])))
 (;W[pc]C[White 6 give Black great thickness.]
 ;B[pd]
 ;W[mc]
 ;B[md]
 ;W[nc]
 ;B[ld]
 ;W[qc]
 ;B[rd]
 ;W[rc]
 ;B[qj]))
 (;B[pc]
 ;W[od]
 ;B[pf]LB[le:b][me:a]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[me]LB[kd:A][le:B]C[After 'a', the White stones are still light and open to attack.
 After 'b' they become settled and safe, while Black gets a wall in the middle of the top side.]
 (;B[kd]
 ;W[kf]
 ;B[ph]C[
 * Joseki *])
 (;B[le]
 ;W[lf]
 ;B[ke]
 ;W[md]LB[ic:b][ph:a]C[Black continues with 'a', or if the ladder is favorable off 'a', Black may continue with 'b'.]
 (;B[ph]
 ;W[ld]
 ;B[kd]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[kf])
 (;B[ic]C[Black must have the ladder off Black 7 to play this way.]
 ;W[qe]LB[pe:a][qf:b]C[Black continues with 'a' only with a favorable ladder, otherwise Black must play 'b'.]
 (;B[pe]C[Black must have the ladder to play this way.]
 ;W[pd]LB[qc:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]
 ;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[qh]
 ;W[rh]
 ;B[ri]LB[ph:b][qi:a]C[White 'a' and Black captures the three White stones on the right.
 White 'b' is a disaster for Black if Black does not have the ladder.]
 (;W[qi]
 ;B[ph]
 ;W[rj]
 ;B[rg]
 ;W[si]
 ;B[re])
 (;W[ph]
 ;B[qi]
 ;W[og]
 ;B[oh]
 ;W[pi]
 ;B[of]
 ;W[ng]
 ;B[nf]
 ;W[mf]
 ;B[nh]
 ;W[mg]
 ;B[pj]))
 (;B[qf]C[Black 17 is a mistake.]
 ;W[qc]))
 (;B[qf]
 ;W[pe]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[of]
 ;B[rg]
 ;W[pg]
 ;B[qg]
 ;W[ph]))))
 (;W[le]LB[qe:a]C[White cannot aim at 'a' by playing the capping play of White 8.]
 ;B[jd]
 ;W[qe]C[White 10 does not work. The sequence that follows shows why.]
 ;B[pe]
 ;W[pd]
 ;B[qc]
 ;W[qf]
 ;B[ne]C[Black 15 is sente, so Black can continue with ni-dan bane (2-step hane).]
 ;W[md]C[White must play 16 to stay connected.]
 ;B[qg]
 ;W[rg]
 ;B[rh])))
 (;W[oe]C[White 4 is not joseki with the two-space low pincer.]
 ;B[pf]LB[ic:A][jc:B]C['a' or 'b'.]
 (;W[ic]
 ;B[le]
 ;W[of]C[White is pushing Black from behind, which is hopeless.]
 ;B[pg])
 (;W[jc]
 ;B[le]
 ;W[of]
 ;B[pg]))
 (;W[qb]C[White 4 is too low for the first response.]
 ;B[od]LB[nd:b][pd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[nd]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd])
 (;W[nd]C[White 6 is an overplay.]
 ;B[pc]
 ;W[pb]
 ;B[nc]
 ;W[ob]
 ;B[nb]
 ;W[oe]
 ;B[pd]))
 (;W[pd]LB[qc:a][qe:b]C[White 4 is a mistake.
 Black continue with 'a'. Black 'b' is weak.]
 (;B[qc]LB[qe:b][pf:a]C[White continues wtih 'a'. White 'b' is an overplay.]
 (;W[pf]
 ;B[qe]
 ;W[nf]
 ;B[qg]C[White stones are thin.])
 (;W[qe]C[White 6 is an overplay.]
 ;B[pe]
 ;W[re]
 ;B[oe]
 ;W[pc]
 ;B[qb]C[Black 11 ensures that the three White stones are dead.]
 ;W[rd]
 ;B[nc]
 ;W[nb]
 ;B[od]))
 (;B[qe]C[Black 5 is timid.]
 ;W[qc]
 ;B[rc]
 ;W[qb])))
 (;B[kc]LB[ic:g][qc:a][ld:j][pd:b][ke:i][pe:c][of:d][pf:e][pg:k][qg:f][dp:h]C[
 Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
 ---------------------------------------------------------------
 Black 1 is a pincer play said to have been developed by the 4th Honinbo Dosaku (1645-1702). This move maintains overall balance while attacking the White kakari stone. It is often used when there is a White stone on the top-left star-point.
 White's responses range from 'a', 'b', 'c', 'd', 'e'.'f' or g', and include playing elsewhere 'h'.
 White may need the ladder to play 'c'.
 White reply at 'i' comes from a 19th century Japanese game.
 'j' has been played professionally.
 'k' is possible.
 i9, h8, g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1, b2, d4 - Black choice
 c3 - White choice
 e5 - Taisha
 f6 - Black top, White right
 g7 - White far top, right; Black corner, near right
 h8 - White top
+]
 (;W[qc]LB[pc:b][rc:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]LB[pg:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[pg]C[
 * Joseki *])
 (;B[qh]
 ;W[pe]
 ;B[pf]
 ;W[of]
 ;B[pg]))
 (;B[qb]
 ;W[qe]
 ;B[pc]LB[pb:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[qc]
 ;W[oe]
 ;B[]C[Black plays elsewhere.]
 ;W[nb]LB[ob:a]C[White 13 is better than White 'a'. This forces Black to capture White 10.]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[qf])
 (;W[pb]LB[qc:b][pe:a]C[White 10 is a mistake. The pincer of Black 3 is still effective.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]
 ;W[qc]
 ;B[rd]LB[od:a][qf:b]C[White continues with 'a'. White 'b' is a bit unreasonable.]
 (;W[od]
 ;B[qf]C[Black 5 takes profit while the pincer of Black 3 still has meaning.])
 (;W[qf]C[White 14 is not recommended. White has created two weak groups.]
 ;B[oe]C[Black 15 helps Black's weak stone. Black has an advantage in the coming fight: White cannot start the ko to attack Black's corner. Thus, White has two weak groups.]))
 (;B[qc]C[Black 11 is a mistake.]
 ;W[oe]C[Now White 10 is more effective than having been played on the other side. Black's pincer now looks lonely.]))))
 (;B[pc]LB[pb:B][pd:A]C[Black 5 is overly aggressive.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]
 ;B[pb]
 ;W[qe]
 ;B[rd]
 ;W[qb]LB[ob:a][pe:b]C[Black 'a' is better than 'b'.]
 (;B[ob]
 ;W[re]
 ;B[od]
 ;W[pe])
 (;B[pe]C[Black 11 is not as favorable as playing x. At best, Black 11
 represents a special strategy.]MA[ob]
 ;W[od]
 ;B[qf]))
 (;W[pb]C[White 6 is weak.]
 ;B[pd]
 ;W[rb]
 ;B[rc]
 ;W[qb]
 ;B[od]
 ;W[nc]
 ;B[nd])))
 (;W[pd]LB[qc:b][pe:c][qe:a][pf:d]C[Black continues with 'a' or 'b'.
 Black 'c' is an overplay.
 Black 'd' is an odd move.
 outcomes:
 a1 - Black right, White corner
 b2 - Black top, White big corner]
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[pg]LB[rb:A][mc:B]TR[kc]C[Later in the followup, as the marked stone is far, 'a' and 'b' are miai.])
 (;B[qc]
 ;W[qe]LB[pe:a][re:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]
 ;W[re]
 ;B[oe]
 ;W[pc]
 ;B[qb]LB[mc:C][nd:B][rd:A]C['a' and 'b' are joseki, 'c' is a mistake.]
 (;W[rd]LB[mc:B][nc:A]C['a' or 'b'.]
 (;B[nc]
 ;W[nb]LB[mb:B][mc:A]C['a' is ok, 'b' encloses or crushes White with the ladder.]
 (;B[mc]
 ;W[mb]C[The 2-space high pincer has the same variation; refer to that joseki.]
 ;B[lb]
 ;W[pb]C[
 * Joseki *])
 (;B[mb]
 ;W[nd]
 ;B[mc]
 ;W[od]
 ;B[me]
 ;W[ne]C[This move doesn't work without the ladder.]
 ;B[nf]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[mf]
 ;B[ng]
 ;W[oh]
 ;B[md]
 ;W[mg]
 ;B[ob]C[Without the ladder, Black can get a good result here.]
 ;W[nh]
 ;B[nf]))
 (;B[mc]
 ;W[pb]
 ;B[nc]
 ;W[rb]))
 (;W[nd]LB[mc:A][ne:B]C['a' or 'b'.]
 (;B[mc]
 ;W[ld])
 (;B[ne]
 ;W[rd]
 ;B[md]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[me]
 ;B[ld]
 ;W[rb]
 ;B[mf]))
 (;W[mc]LB[rd:B][qf:A]C[Black can choose, if he wants to enclose White on 'a' or live in the corner and keep White separerated on 'b'.]
 (;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rd]
 ;B[rc]
 ;W[sb]
 ;B[le])
 (;B[rd]
 ;W[qg]
 ;B[pb]
 ;W[ob]
 ;B[sb])))
 (;B[re]C[Black 7 is weak.]
 ;W[rf]
 ;B[qf]
 ;W[pe]LB[rd:b][rg:a]C[Black must play 'a'. Black 'b' is unreasonable regardless of the ladder.]
 (;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc])
 (;B[rd]C[Black 11 is unreasonable.]
 ;W[rg]C[Black must play to live in the corner, allowing White to capture Black 9 and gaining great position.])))
 (;B[pe]LB[qc:a][qe:b]C[Black 5 is an overplay.
 White continues with 'a'. White 'b' is not as favorable.]
 (;W[qc]LB[od:b][qe:a]C[Black continues with 'a'. Black 'b' is crude.]
 (;B[qe]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[rc]
 ;W[qb]
 ;B[qh]C[Black gets a result better than joseki.])
 (;B[od]C[Black 7 is crude.]
 ;W[pc]
 ;B[nd]
 ;W[re]C[White 10 is a tesuji, allowing White to connect underneath, thus giving White a good result.]))
 (;W[qe]C[White 6 reverts to joseki, but in doing so, White has missed
 an opportunity for a better result.]
 ;B[qc]LB[qc:7][pe:5]C[For continuation, see the variaton of Black 7 played before 5.]))
 (;B[pf]LB[qc:a][qe:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qc]LB[pe:b][qe:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qe]
 ;W[rc])
 (;B[pe]C[Black 7 is not recommended.]
 ;W[rd]
 ;B[qe]
 ;W[nd]))
 (;W[qe]C[White 6 is an overplay.]
 ;B[pe]
 ;W[qc]
 ;B[rd]
 ;W[re]
 ;B[od]
 ;W[pc]
 ;B[rf]C[Black 13 give Black nice thickness.])))
 (;W[pe]LB[pd:b][qe:a][qj:c]C[White may need the ladder to play this way.
 Black continues with 'a'.
 Black 'b' is not recommended unless cirucumstances favor it; the variation shown in 'c'.]
 (;B[qe]LB[qc:b][pf:a]C[White continues with 'a' or 'b'.]
 (;W[pf]LB[qf:B][qg:A]C['a' is usual, 'b' is possible.]
 (;B[qg]LB[ic:A][qc:B]C['a' or 'b'.]
 (;W[ic]
 ;B[ke]C[
 * Joseki *]
 ;W[qc]LB[rc:b][pg:a]C[White must have the ladder to play 1.
 Black continues at 'a'. Black 'b' is a mistake.]
 (;B[pg]
 ;W[pd]
 ;B[ng]
 ;W[qf]
 ;B[rf]
 ;W[rc])
 (;B[rc]C[Black 11 is a mistake.]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[qh]))
 (;W[qc]LB[pd:B][pg:A]C['a' or 'b'.]
 (;B[pg]
 ;W[pd]
 ;B[ng]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[rh])
 (;B[pd]
 ;W[od]
 ;B[pc]
 ;W[qf]
 ;B[rf]
 ;W[pb]
 ;B[qb]
 ;W[rc]
 ;B[re]
 ;W[rb]
 ;B[ob]
 ;W[qa]
 ;B[oe]
 ;W[nb]
 ;B[ne])))
 (;B[qf]
 ;W[pg]
 ;B[qh]
 ;W[ic]
 ;B[ke]))
 (;W[qc]LB[rc:a][pd:c][pf:b]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[rc]LB[qb:B][pf:A]
 (;W[pf]
 ;B[pd]
 ;W[od]
 ;B[pc]
 ;W[nf]
 ;B[hc])
 (;W[qb]C[White 8, a natural move, is not correct.]
 ;B[pf]
 ;W[pd]
 ;B[qg]C[This result is favorable to Black.]))
 (;B[pf]LB[pc:A][pd:B]C[White continues at 'a'. White 'b' solidifies Black more.]
 (;W[pc]C[White 8 is too weak.]
 ;B[qi]C[
 * Joseki *])
 (;W[pd]LB[rc:b][qg:a]C[Black continues with 'a'. Black 'b' leads to a fight Black may not like.]
 (;B[qg]
 ;W[rf]
 ;B[qf]
 ;W[rc]
 ;B[qj])
 (;B[rc]C[Black 9 is a tough move that may be an overplay.]
 ;W[qf]
 ;B[qb]
 ;W[pc]
 ;B[re]
 ;W[rf]
 ;B[se]
 ;W[qh]
 ;B[of]
 ;W[ld])))
 (;B[pd]C[ Black 7 is a mistake.]
 ;W[pc]
 ;B[od]
 ;W[nd]
 ;B[ne]
 ;W[md]C[White gets a favorable result.])))
 (;B[pd]C[Black 5 is inconsistent with the leisurely distance of the pincer.
 White should not have a problem settling himself.]
 ;W[od]
 ;B[oe]
 ;W[pf]
 ;B[ne]
 ;W[qb]
 ;B[rf]
 ;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rc]
 ;W[md]
 ;B[rg]
 ;W[qi])
 (;B[qj]LB[pd:a]C[Black may push through with 'a' if he has support such as at Black 5.]
 ;W[pi]LB[pd:a]C[The shoulder hit at White 6 is helpful if Black pushes through and cuts at 'a'.]
 ;B[pd]
 ;W[od]
 ;B[oe]
 ;W[pf]
 ;B[ne]
 ;W[qb]
 ;B[rf]))
 (;W[of]LB[hc:c][oe:b][qg:a]C[Black continues with 'a', 'b' or 'c'.]
 (;B[qg]
 ;W[ic]LB[mc:b][ke:a]C[Black continues with 'a' or 'b'.]
 (;B[ke]
 ;W[ie]
 ;B[kg]LB[qc:a][ig:b]C[White continues with 'a' or 'b'.]
 (;W[qc]
 ;B[rc]LB[pd:a][rd:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]C[
 * Joseki *])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[od]
 ;W[nd]
 ;B[pe]
 ;W[pf]
 ;B[ne]
 ;W[qi]
 ;B[me]))
 (;W[rd]LB[qe:a][re:b]C[White 12 is selfish. Black plays 'a' while White hopes for 'b'.]
 (;B[qe]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[od]
 ;W[pb]
 ;B[nd]
 ;W[pd]
 ;B[pe])
 (;B[re]C[Black 13 is a mistake.]
 ;W[pd]
 ;B[qe]
 ;W[rb])))
 (;W[ig]
 ;B[pc]LB[od:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[od]
 ;B[pe]
 ;W[oe]
 ;B[ph]
 ;W[mh]
 ;B[ki]
 ;W[oh]
 ;B[pj]
 ;W[mj])
 (;W[pe]
 ;B[qe]
 ;W[pb]LB[qb:a][nc:b]C[Black continues with 'a' or 'b'.]
 (;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[mc])
 (;B[nc]
 ;W[qc]
 ;B[pd]
 ;W[od]
 ;B[nb]
 ;W[ob]
 ;B[qb]
 ;W[oh]))))
 (;B[mc]LB[qc:a][pd:b]C[White continues with 'a' or 'b'.]
 (;W[qc]
 ;B[rc]LB[qb:B][pd:A]C['a' is correct, 'b' is questionable.]
 (;W[pd]
 ;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[od]
 ;W[nd]
 ;B[pe]
 ;W[pf]
 ;B[nc]
 ;W[qi])
 (;W[qb]LB[od:A]C[Black 'a' is questionable.]
 ;B[od]
 ;W[nd]
 ;B[pd]
 ;W[nc]))
 (;W[pd]
 ;B[qc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[rd]
 ;W[oh])))
 (;B[oe]
 ;W[ne]
 ;B[pe]LB[lc:b][nd:a]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[nf]LB[mf:B][og:A]C['a' is joseki, 'b' is bad.]
 (;W[og]LB[mf:B][ng:A]C[Black continues with 'a' or 'b'.]
 (;B[ng]
 ;W[oh]LB[lf:A][nh:B]C['a' is joseki, 'b' is a less favorable variation.]
 (;B[lf]
 ;W[qb]
 ;B[qg]C[
 * Joseki *])
 (;B[nh]
 ;W[qf]
 ;B[pf]
 ;W[qg]
 ;B[qe]
 ;W[pg]
 ;B[pc]
 ;W[le]))
 (;B[mf]
 ;W[ld]))
 (;W[mf]
 ;B[ng]
 ;W[le]
 ;B[og]TR[kc]C[The marked stone is not surrounded, so the position is not equal.]))
 (;W[lc]LB[kd:b][nf:a]C[Black continues with 'a' or 'b'.]
 (;B[nf]LB[kd:B][me:A]C['a' is correct, 'b' is questionable.]
 (;W[me]
 ;B[og]
 ;W[mf]
 ;B[ng]
 ;W[kb])
 (;W[kd]LB[jc:A][og:B]C['a' leaves White without a good answer. If he is weak, Black can be satisfied with 'b'.]
 (;B[jc])
 (;B[og]
 ;W[jc])))
 (;B[kd]
 ;W[nf]LB[lb:b][qg:a]C[Black continues with 'a' or 'b'.]
 (;B[qg]
 ;W[lb])
 (;B[lb]
 ;W[mc]
 ;B[qg]
 ;W[hd]))))
 (;B[hc]
 ;W[qf]LB[pc:a][od:c][dp:b]C[Black continues at 'a' or 'c'.
 Even if Black plays elsewhere ('b'), the 3-4 stone retains aji.]
 (;B[pc]
 ;W[od]
 ;B[ob]
 ;W[nb]
 ;B[pb])
 (;B[dp]LB[lc:B][qc:A]C['a' or 'b'.]
 (;W[qc]
 ;B[pc]LB[pb:a][pd:b]C[White continues with 'a'. White 'b' fails.]
 (;W[pb]
 ;B[pd]
 ;W[qb]
 ;B[od]C[Black escapes.]
 ;W[nc]
 ;B[nd]
 ;W[md]LB[me:a][ne:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[me]LB[lc:a][ne:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[lc]
 ;B[nf]
 ;W[kd])
 (;W[ne]C[White 18 starts a fight White is likely to lose.]
 ;B[mc]
 ;W[ld]
 ;B[mb]))
 (;B[ne]C[Black 17 is not recommended.]
 ;W[mc]
 ;B[pg]
 ;W[pf]
 ;B[nf]
 ;W[og]
 ;B[le]))
 (;W[pd]C[White 10 is a mistake.]
 ;B[pb]LB[ob:B][qb:A]C['a' is correct. 'b' is a mistake.]
 (;W[qb]
 ;B[od]
 ;W[pe]
 ;B[ob]
 ;W[nc]
 ;B[nb]LB[mc:a][rd:b]C[White 'a' and Black captures the corner with 'b'. White 'b' and Black captures two White stones (2 & 16).]
 (;W[mc]
 ;B[rd])
 (;W[rd]
 ;B[nd]))
 (;W[ob]
 ;B[pe]
 ;W[od]
 ;B[qe]
 ;W[rc]
 ;B[pf])))
 (;W[lc]
 ;B[ld]
 ;W[mc]
 ;B[kd]
 ;W[qb]))
 (;B[od]LB[pc:B][nd:A]C['a' or 'b'.]
 (;W[nd]
 ;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[ob]
 ;B[pb]
 ;W[mc]
 ;B[re])
 (;W[pc]
 ;B[pd]
 ;W[nd]
 ;B[qc]
 ;W[mc]
 ;B[rf]
 ;W[rg]
 ;B[re]))))
 (;W[pf]LB[od:B][pe:A][qf:C]C[White 4 introduces the taisha, but there are not as many variations as with the 5-3 point.
 Both 'a' and 'b' are joseki. 'c' is similar to 'a', but inferior.]
 (;B[pe]
 ;W[oe]LB[od:B][qf:A]C['a' is joseki. 'b' is a mistake,]
 (;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]LB[qh:A][qi:B]C[Black on 'a' is joseki, 'b' is a mistake.]
 (;B[qh]
 ;W[pi]
 ;B[qj]
 ;W[ic]C[
 * Joseki *])
 (;B[qi]
 ;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pc]
 ;B[sb]
 ;W[qh]
 ;B[rh]
 ;W[ri]))
 (;B[od]
 ;W[nd]
 ;B[pd]
 ;W[ne]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[lc]
 ;B[ob]
 ;W[kd]TR[kc]C[The marked stone is wasted now.]))
 (;B[od]LB[nd:b][pd:a]C[White continues with 'a' or 'b'. White can only play 'b' with a favorable ladder.]
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[qe]
 ;W[oe]
 ;B[nd]
 ;W[qc]LB[rc:b][re:c][qf:a]C[Black continues with 'a' to 'c'.
 c3, b2, a1]
 (;B[qf]
 ;W[of]
 ;B[qh]LB[mb:a][mc:b]C[White continues with 'a', or if the ladder is favorable, may play 'b'.]
 (;W[mb]
 ;B[ld]
 ;W[oh]
 ;B[pj]
 ;W[lg]LB[id:B][je:A]C['a' or 'b'.]
 (;B[je]C[
 * Joseki *])
 (;B[id]))
 (;W[mc]C[White must have the ladder to play this way.]
 ;B[md]
 ;W[ld]LB[lc:a][nc:b]C[Black continues with 'a'. Black 'b' falls into a trap.]
 (;B[lc]
 ;W[nc]LB[le:a]C[Black must not be able to capture White 18 by playing 'a' for White to play this way.])
 (;B[nc]C[Black 19 is a mistake.]
 ;W[nb]
 ;B[mb]
 ;W[lc]
 ;B[ob]
 ;W[na]LB[ma:a][me:b]C[Black may try 'a' or 'b'. Both fail, though 'b' may be preferable.]
 (;B[ma]
 ;W[me]
 ;B[oa]
 ;W[nb]
 ;B[na]
 ;W[ne]
 ;B[nb]
 ;W[lb]
 ;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[pa])
 (;B[me]
 ;W[lb]
 ;B[rc]
 ;W[pb]))))
 (;B[rc]
 ;W[rb]
 ;B[qg]
 ;W[mb]
 ;B[ld]
 ;W[of]
 ;B[rd]LB[ph:a][qi:b]C[Joseki continues with White 'a'.
 White 'b' was played by Akaboshi Intetsu in 1835 against Honinbo Jowa. This game was nicknamed "Intetsu's blood-vomiting game", because of a stomach hemorrhage Intetsu had (and died of a month later).]
 (;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[rj]
 ;W[lg]
 ;B[je])
 (;W[qi]C[White 18 is not joseki; Black gains a favorable position.]
 ;B[ph]
 ;W[pi]
 ;B[oh]
 ;W[mf]
 ;B[qb]LB[qa:b][pb:a]C[Black 6 is a clever move. White continues with 'a'. White 'b' is less favorable.]
 (;W[pb]
 ;B[ra]LB[sb:b][nc:a]C[White continues with 'a'. White 'b' gives a flower-viewing ko (nothing to lose), inviting defeat.]
 (;W[nc]
 ;B[me]
 ;W[sb]
 ;B[lf]
 ;W[mg]
 ;B[lg]
 ;W[mh]
 ;B[oi]
 ;W[lh]
 ;B[pk])
 (;W[sb]C[White 28 is premature, and a mistake.]
 ;B[nc]
 ;W[nb]
 ;B[pa]))
 (;W[qa]C[White 26 eliminates ko potential, but at a cost.]
 ;B[sb]
 ;W[ra]
 ;B[nb]
 ;W[nc]
 ;B[mc]
 ;W[ob]
 ;B[lb]
 ;W[na])))
 (;B[re]LB[mb:a][rc:b]C[White continues with 'a'. White 'b' is less favorable.]
 ;W[mb]
 ;B[md]
 ;W[nf]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[qh]LB[mc:a][lf:b]C[White continues with 'a'. White 'b' and White suffers a squeeze in sente on the corner stones.]
 (;W[mc]
 ;B[le]
 ;W[lg])
 (;W[lf]C[White 22 is a mistake.]
 ;B[qb]
 ;W[pb]
 ;B[nb]
 ;W[nc]
 ;B[mc]
 ;W[lb]
 ;B[pa]
 ;W[qa]
 ;B[oa]
 ;W[ma]
 ;B[kb]
 ;W[na])))
 (;W[nd]C[White must have the ladder to play 6.]
 ;B[oe]
 ;W[pc]LB[qc:b][qe:a][of:c]C[Black continues with 'a' if the ladder is unfavorable (Black 5 & 7 can be captured in a ladder), or 'b' if the ladder works for Black. White should not have played White 6 if the ladder works for Black.
 Black 'c' was played by Hashimoto Utaro against Kajiwara in 1974.]
 (;B[qe]
 ;W[qc]
 ;B[qi]C[
 * Joseki *])
 (;B[qc]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[of])
 (;B[of]LB[qc:a][pd:c][pg:b]C[White continues with 'a'. White 'b' and 'c' are unreasonable.]
 (;W[qc]
 ;B[re]LB[rc:b][rd:a]C[White continues with 'a', which is better than White 'b'.]
 (;W[rd]
 ;B[qe]
 ;W[mc])
 (;W[rc]LB[nc:a]C[Black can aim at the cutting point of 'a' later if the ladder
 favors him.]))
 (;W[pg]
 ;B[qc]C[White cannot push through and cut as the ladder no longer exists.])
 (;W[pd]C[White 10 is unreasonable.]
 ;B[pe]
 ;W[qe]
 ;B[qf]
 ;W[re]LB[nc:a][pg:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nc]LB[qc:b][rd:a]C[White continues with 'a', not 'b'.]
 (;W[rd]
 ;B[pb]C[Black 17 is a tesuji.]
 ;W[qc]
 ;B[pg]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[md]
 ;W[ne]
 ;B[ob])
 (;W[qc]C[White 16 is a mistake.]
 ;B[rf]
 ;W[rd]
 ;B[pg]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[md]
 ;W[ne]
 ;B[mf]))
 (;B[pg]C[Black 15 is a mistake.]
 ;W[rd])))))
 (;B[qf]
 ;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[qh]
 ;W[ic]))
 (;W[qg]
 ;B[pe]
 ;W[qj]LB[pc:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[mc]LB[nc:a][ld:c][md:b]C[Black continues with 'a' to 'c'.]
 (;B[nc]
 ;W[nb]
 ;B[md]
 ;W[lc]
 ;B[ld]
 ;W[kb]
 ;B[jb]
 ;W[jc]
 ;B[kd]
 ;W[lb]
 ;B[ic]C[Black needs the ladder.]
 ;W[qb]
 ;B[pc]
 ;W[pb]
 ;B[od]LB[ob:a][rc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ob]
 ;B[jd])
 (;W[rc]C[White 24 is a mistake.]
 ;B[ob]
 ;W[oa]
 ;B[ma]
 ;W[na]
 ;B[ka]
 ;W[mb]LB[hb:b][jd:a]C[If White now plays 'a', Black can play 'b'.]))
 (;B[md]
 ;W[lc]LB[kd:b][ld:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[ld]
 ;W[kb]LB[jb:a][jc:b]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[jb]
 ;W[jc]
 ;B[kd]LB[ib:a][lb:b]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[ib]
 ;B[nc])
 (;W[lb]
 ;B[ic]
 ;W[qb]
 ;B[rb]LB[pb:b][qc:a]C[White 'a' is better than White 'b'.]
 (;W[qc]
 ;B[rc]
 ;W[re]
 ;B[rd]
 ;W[pc]LB[qa:c][nb:b][nc:a]C[If the Black 'a', White 'b' exchange had been made, White 24 would not be necessary. As it is, without White 24, Black 'c' kills the White group.])
 (;W[pb]
 ;B[qc]LB[nc:a][dp:b]C[White must play 'a'. White cannot afford to play elsewhere ('b').]
 (;W[nc])
 (;W[]C[White plays elsewhere, and will be killed for it.]
 ;B[nb]
 ;W[nc]
 ;B[ka]
 ;W[la]
 ;B[oa]))))
 (;B[jc]C[Black 13 is weak.]
 ;W[jb]
 ;B[ic]
 ;W[pb]))
 (;B[kd]C[Black 11 is an overplay.]
 ;W[kb]
 ;B[jb]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[lb]
 ;B[id]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]LB[oe:a]C[Black must play 23 to defend against White 'a'.]))
 (;B[ld]LB[qb:A][qc:B]C['a' is correct, 'b' is inferior.]
 (;W[qb]
 ;B[rb]
 ;W[kb]
 ;B[jb]LB[lb:b][md:a]C[White continues with 'a'. White 'b' is premature, and leads to ko.]
 (;W[md]
 ;B[me]
 ;W[lb]
 ;B[jc]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[ne]C[The joseki ends.]
 ;W[]C[White plays elsewhere.]
 ;B[nc]
 ;W[nb]
 ;B[ka]LB[la:b][ma:a]C[White continues with 'a'. White 'b' is a deadly mistake.]
 (;W[ma]
 ;B[lc]
 ;W[oa])
 (;W[la]C[White 25 is a mistake.]
 ;B[oa]
 ;W[pa]
 ;B[ob]
 ;W[na]
 ;B[mb]))
 (;W[lb]C[White 14 is a mistake.]
 ;B[md]C[White must add a stone.]
 ;W[]C[White plays elsewhere, a mistake.]
 ;B[nc]
 ;W[nb]
 ;B[ka]
 ;W[ma]
 ;B[lc]
 ;W[oa]
 ;B[mb]C[White must fight the ko for life.]))
 (;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[od]
 ;W[rd]
 ;B[re]
 ;W[sc])))
 (;B[pc]LB[pb:a][ld:b][od:c]C[White continues with 'a' or 'b'. White 'c' is heavy.]
 (;W[pb]
 ;B[qb]
 ;W[of]
 ;B[nd]LB[rc:A]C[Later, White can play on 'a'.])
 (;W[ld]
 ;B[kd]
 ;W[le]
 ;B[ke]
 ;W[lf]
 ;B[jg]
 ;W[lh])
 (;W[od]C[White 8 is heavy.]
 ;B[md]
 ;W[oe]
 ;B[pf]
 ;W[nf]
 ;B[pg])))
 (;W[ic]LB[pc:c][pe:b][pf:a]C[White 4 may be appropriate when White has support at top left.
 Black continues with 'a'. Black 'b' is slow. 'c' is inferior.]
 (;B[pf]LB[qc:A][dp:B]C['a' is correct, tenuki 'b' is inferior.]
 (;W[qc]
 ;B[rc]LB[qb:B][pd:A]
 (;W[pd]LB[qb:B][qe:A]
 (;B[qe]
 ;W[qb])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[pe]
 ;B[od]LB[oe:b][of:a]C[White continues with 'a' or 'b', 'a' if the ladder is favorable, 'b' if not.]
 (;W[of]LB[nd:b][oe:a]C[White must have the ladder from Black 15 (at 'b') to play this way.
 Black continues with 'a'. Black 'b' is weak.]
 (;B[oe]
 ;W[qf]
 ;B[pg]
 ;W[og]
 ;B[oh]
 ;W[nh]LB[md:b][nf:a][ng:c]C[Black continues with 'a'. Black 'b' is a mistake.
 Black 'c' gives White superior thickness for 20 points of Black
 territory.]
 (;B[nf]
 ;W[ng]
 ;B[mi]
 ;W[mf]
 ;B[nc]
 ;W[nd]
 ;B[ob]
 ;W[ne]
 ;B[oc]
 ;W[oi]
 ;B[ph]
 ;W[pi]
 ;B[rg]
 ;W[rh]
 ;B[qg]
 ;W[ni]C[The result slightly favors Black.])
 (;B[md]C[Black 23, trying to block White's ladder, is a mistake.]
 ;W[ph]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[qi]
 ;B[pi]
 ;W[rh])
 (;B[ng]C[Black 23 gives Black about 20 points of territory, but White has superior thickness.]
 ;W[nf]
 ;B[mf]
 ;W[mg]
 ;B[ne]
 ;W[ng]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[me]
 ;B[nd]
 ;W[mc]
 ;B[nc]
 ;W[nb]
 ;B[ob]
 ;W[md]
 ;B[oc]
 ;W[oi]
 ;B[qh]
 ;W[lf]))
 (;B[nd]C[Black 17 is submissive, and give White good shape.]
 ;W[pg]
 ;B[ld]))
 (;W[oe]C[White 16 if ladders are unfavorable.]
 ;B[nd]LB[ld:b][of:a]C[White continues with 'a' or 'b'.]
 (;W[of]
 ;B[ld])
 (;W[ld]C[White 18 is a preference in style compared to the previous variation.
 White 18 is intended to annoy and for later aji.]
 ;B[ne]
 ;W[of]
 ;B[kd]
 ;W[le]
 ;B[nf]
 ;W[og]
 ;B[lc]))))
 (;W[qb]
 ;B[pd]
 ;W[mc]))
 (;W[dp]
 ;B[pc]
 ;W[od]
 ;B[ke]
 ;W[mf]))
 (;B[pe]C[Black 5 was popular around 1800, when Genjo and Chitoku were playing. It is a slow way of playing.]
 ;W[nd]
 ;B[ke]
 ;W[ld]
 ;B[kd]
 ;W[qb])
 (;B[pc]
 ;W[od]
 ;B[pf]
 ;W[ke]))
 (;W[]LB[pc:A][od:B]C[White plays elsewhere.
 'a' is correct, 'b' is inferior.]
 (;B[pc]LB[od:A][pe:B]C['a' is correct, 'b' is bad.]
 (;W[od]
 ;B[pf]LB[ld:c][ke:b][le:a]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[le]LB[hc:c][jd:a][ke:b]C[Black continues with 'a', 'b' or 'c'.]
 (;B[jd]
 ;W[jf]
 ;B[ph]C[
 * Joseki *])
 (;B[ke]
 ;W[kf]
 ;B[je]
 ;W[ld]
 ;B[lc]
 ;W[mc]C[
 * Joseki *]
 ;B[hc]
 ;W[lg]
 ;B[ph])
 (;B[hc]
 ;W[id]
 ;B[ic]
 ;W[lc]
 ;B[lb]
 ;W[kd]
 ;B[jc]
 ;W[mc]
 ;B[ph]))
 (;W[ke]LB[id:b][le:a]C[Black continues with 'a' or 'b'.]
 (;B[le]
 ;W[lf]
 ;B[me]
 ;W[of]LB[kf:A][mf:B]C['a' or 'b'.]
 (;B[kf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[je]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[re]
 ;W[qe]
 ;B[pe]
 ;W[oe]
 ;B[qe]
 ;W[nh])
 (;B[mf]
 ;W[pe]
 ;B[qe]
 ;W[kf]
 ;B[kd]
 ;W[oh]
 ;B[mg]
 ;W[pg]
 ;B[qf]
 ;W[qg]))
 (;B[id]
 ;W[lc]LB[lb:b][ld:a]C[Black starts a fight with 'a'. Black 'b' is too mild.]
 (;B[ld]LB[kd:b][pd:a]C[Black starts a fight with 11.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]LB[qc:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]LB[qc:a][kd:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qc]
 ;B[rc]
 ;W[pb]
 ;B[mc]
 ;W[rb])
 (;W[kd]C[White 14 is a mistake.]
 ;B[mc]
 ;W[lb]
 ;B[mb]
 ;W[md]
 ;B[le]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ib]
 ;W[nb]
 ;B[me]
 ;W[nd]
 ;B[pb]
 ;W[of]
 ;B[kf]
 ;W[og]
 ;B[qh]))
 (;B[qc]
 ;W[kd]
 ;B[mc]
 ;W[lb]
 ;B[mb]LB[kb:b][md:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[md]
 ;B[le]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ib]
 ;W[nb]
 ;B[me]
 ;W[nd]
 ;B[nf]
 ;W[pb]
 ;B[qb]
 ;W[pa]
 ;B[qg]LB[qe:a]C[Black 31, to prevent White 'a', cannot be omitted.]
 ;W[jf])
 (;W[kb]C[White 18 is a mistake.]
 ;B[me]
 ;W[jc]
 ;B[nf])))
 (;W[kd]C[White 12 is a mistake.]
 ;B[mc]
 ;W[lb]
 ;B[mb]
 ;W[md]
 ;B[le]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ib]
 ;W[nb]
 ;B[me]
 ;W[nd]
 ;B[nf]
 ;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[pb]
 ;B[kf]))
 (;B[lb]C[Black 11 is too mild.]
 ;W[ld]LB[jb:a][ph:b]C[Black 'a' is honte (proper), but gives White a start on a favorable fight. Black 'b' gives White Black 11. Thus Black 11 is bad.]
 (;B[jb]
 ;W[qe]LB[pe:a][qf:b]C[White provokes a fight with 14.
 Black continues with 'a'. Black 'b' is unbearably submissive.]
 (;B[pe]
 ;W[pd]LB[qc:a][qf:b]C[Black continues with 'a'. Black 'b' gives up too much.]
 (;B[qc]
 ;W[qf]C[A fight where Black's prospects are not great.])
 (;B[qf]C[Black 17 is bad.]
 ;W[qc]
 ;B[re]
 ;W[rc]))
 (;B[qf]
 ;W[pe]
 ;B[re]LB[rd:b][rf:a]C[White continues with 'a' or 'b'.]))
 (;B[ph]
 ;W[jc]
 ;B[jd]
 ;W[kb]
 ;B[kd]
 ;W[ib]))))
 (;W[ld]C[White 8 does not work well.]
 ;B[kd]
 ;W[le]
 ;B[ke]
 ;W[lf]LB[gc:a][jg:b]C[Black continues with 'a' or 'b'.]
 (;B[gc]
 ;W[qe]
 ;B[qf]
 ;W[pe]
 ;B[re]
 ;W[rf]LB[rd:a][rg:b]C[Black continues with 'a' to keep the corner or 'b' to emphasize the side.]
 (;B[rd]
 ;W[of]
 ;B[rg])
 (;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[qc]LB[oh:c][ph:a][pi:b]C[Black extends somewhere around 'a' to 'c'.]))
 (;B[jg]
 ;W[qe]
 ;B[qf]
 ;W[pe]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[of]
 ;B[rg])))
 (;W[pe]
 ;B[pd]
 ;W[oe]
 ;B[od]
 ;W[qe]
 ;B[ne]
 ;W[nf]
 ;B[me]))
 (;B[od]
 ;W[nd]
 ;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[mc]TR[kc]C[The space of the White group is already limited by the marked stone.]))
 (;W[ke]C[White 4 was played in an 1822 game between Honinbo Jowa (White)and Toyama Sansetsu (Black).]
 ;B[je]
 ;W[jf]
 ;B[jd]
 ;W[if]
 ;B[he]
 ;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[pf]
 ;W[of]
 ;B[qf]
 ;W[qh]C[White 16 is usually unreasonable, as Black can cut, but White's thickness in the center (White 4, 6, 8, and stones on the lower left) makes it possible in this instance.]
 ;B[pc]C[Black 17 is necessary to live in the corner.]
 ;W[pn]C[White starts a moyo, revealing the logic for White 16.]
 ;B[kq]
 ;W[mq]
 ;B[hq]
 ;W[dl]
 ;B[dm]
 ;W[em]
 ;B[dn]
 ;W[ip]
 ;B[mr]
 ;W[iq]
 ;B[nq]
 ;W[no]
 ;B[mp]
 ;W[ln]
 ;B[pr]
 ;W[mf]
 ;B[hf]
 ;W[de]
 ;B[ce]
 ;W[cf]
 ;B[cd]
 ;W[hg]
 ;B[gg]
 ;W[hh]
 ;B[gh]
 ;W[gi]
 ;B[eh]
 ;W[ci]
 ;B[qq]
 ;W[dg]
 ;B[ef]
 ;W[eg]
 ;B[ff]
 ;W[df]
 ;B[fi]
 ;W[ec]
 ;B[ed]
 ;W[dd]
 ;B[cc]
 ;W[ee]
 ;B[fd]
 ;W[fe]
 ;B[ge]
 ;W[gd]
 ;B[fc]
 ;W[ie]
 ;B[hd]
 ;W[gc]
 ;B[eb]
 ;W[id]
 ;B[hc]
 ;W[ic]
 ;B[ib]
 ;W[gj]
 ;B[rn]
 ;W[ro]
 ;B[qi]
 ;W[pi]
 ;B[qj]
 ;W[rh]
 ;B[qn]
 ;W[qo]
 ;B[pm]
 ;W[pp]
 ;B[on]
 ;W[po]
 ;B[om]
 ;W[ql]
 ;B[rl]
 ;W[or]
 ;B[oo]
 ;W[qr]
 ;B[pj]
 ;W[np]
 ;B[nr]
 ;W[op]
 ;B[jr]
 ;W[ir]
 ;B[lp]
 ;W[oi]
 ;B[pl]
 ;W[ob]
 ;B[od]
 ;W[mc]
 ;B[pb]C[Move 103 in the diagram (actual move: 119) was the last move of the game. This game is known as "the eternally unfinished game".])
 (;W[ld]C[Played by Cho U Honinbo against Yoda Norimoto Meijin in the 5th game of the 29th Meijin title match 2004.]
 ;B[lc]
 ;W[mc]
 ;B[kd]
 ;W[le]
 ;B[ke]
 ;W[lf]LB[pe:B][qg:A]C['a' or 'b'.]
 (;B[qg])
 (;B[pe]))
 (;W[pg]
 ;B[pe]
 ;W[mg]
 ;B[nd]LB[oc:2][mg:6]C[White 6 is only good for building a moyo on the right, that means, if there are additional White stones in the lower right. Later, White will use the aji of White 2 to make a small life with it.]))
 (;B[md]LB[mc:d][qc:c][pd:h][ne:b][oe:a][pe:e][qh:g][dp:f]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 ----------------------------------------------------------------------------
 Black 3 is typical of the severity of modern Go. White cannot afford to play elsewhere ('f'). Responses range from 'a', 'b', 'c' to 'd'. White 'e' is a trick play, not joseki. 'g' and 'h' are special strategies.
 f6, e5, d4, c3, b2, a1
+]
 (;W[oe]
 ;B[pf]LB[qc:d][kd:a][me:c][ph:b]C[White continues with 'a' to 'c'. White 'b' does not work very well with the high pincer, so is not recommended.
 'd' is a mistake.]
 (;W[kd]LB[mb:C][mc:D][pc:B][mf:A]C['a' and 'b' are joseki, 'c' is possible with a strong Black position in the upper left and aims at sacrificing to close in a small White area. 'd' is questionable.]
 (;B[mf]LB[mc:a][of:b]C[White continues with 'a'. White 'b' is bad, as it gives Black solidity on the fourth line.]
 (;W[mc]
 ;B[nd]
 ;W[nc]
 ;B[od]LB[pc:a][pd:b]C[Joseki continues with White 'a'. White 'b' is unreasonable
 resistance.]
 (;W[pc]CR[lc]LB[qc:b][pd:a]C[Black continues with 'a' or 'b'. Black 'a' as joseki is recent.
 Black 'b' is the old pattern - Black takes more area, but may end in gote and loses the hane at the red dot.]
 (;B[pd]C[
 * Joseki *])
 (;B[qc]
 ;W[pd]
 ;B[pe]
 ;W[ld]
 ;B[of]))
 (;W[pd]LB[pc:a][pe:b]C[Black 'a' is best, as White 12 is unreasonable. If Black 'b',
 White 'a', and the old joseki pattern starting with White 12
 on a results.]
 ;B[pc]
 ;W[pe]
 ;B[qe]
 ;W[of]
 ;B[og]LB[qc:b][qf:a]C[White may try 'a' or 'b'. Neither are favorable for White.]
 (;W[qf]
 ;B[nf]
 ;W[pg]
 ;B[ne]
 ;W[pf]
 ;B[qc]LB[lc:a][ph:b]C['a' and 'b' are miai.])
 (;W[qc]
 ;B[pb]
 ;W[qf]
 ;B[nf]
 ;W[pg]
 ;B[ne]
 ;W[pf]
 ;B[rc]
 ;W[ld]
 ;B[ph]
 ;W[oh]
 ;B[ng]
 ;W[qh]
 ;B[pi]
 ;W[re]
 ;B[rd]
 ;W[rg]
 ;B[se]
 ;W[rf]
 ;B[ri]
 ;W[qi]
 ;B[qj]
 ;W[pj]
 ;B[oi]
 ;W[rj]
 ;B[qk]
 ;W[rh]
 ;B[rk]
 ;W[si]
 ;B[nh]C[White is sealed in.])))
 (;W[of]C[White 8 is a mistake.]
 ;B[pg]LB[mc:a][og:b][ph:c]C[White has lost the connection under at 'a', and is at a loss for a good move. A White push at 'b' and Black replies with 'c', increasing White's loss.]))
 (;B[pc]
 ;W[ob]
 ;B[mf]
 ;W[lc]
 ;B[of]C[
 * Joseki *])
 (;B[mb]LB[me:A][of:B]C['a' or 'b'.]
 (;W[me]
 ;B[nd]
 ;W[pe]
 ;B[qe]
 ;W[qc]
 ;B[pd]
 ;W[od]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[nb]
 ;B[pa]
 ;W[ob]
 ;B[qg]
 ;W[mc])
 (;W[of]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[lc]
 ;B[mc]
 ;W[le]
 ;B[pc]
 ;W[pd]
 ;B[pb]
 ;W[ob]
 ;B[jc]
 ;W[kc]
 ;B[jb]
 ;W[kb]))
 (;B[mc]
 ;W[of]
 ;B[pg]
 ;W[lf]))
 (;W[ph]LB[of:a][pg:b]C[Black continues with 'a' or 'b'. Black 'a' is better.]
 (;B[of]
 ;W[ne]LB[pc:A][ng:B]C['a' and 'b' have the same result.]
 (;B[pc]
 ;W[ob]
 ;B[ng]
 ;W[me]LB[kd:c][oi:a][pk:b]C[Next, Black can play at 'a', 'b' or 'c'. 'c' leads to immediate fighting.])
 (;B[ng]LB[qc:B][me:A]C['a' or 'b'.]
 (;W[me]
 ;B[pc]
 ;W[ob])
 (;W[qc]LB[rc:A][pd:B]C['a' or 'b'.]
 (;B[rc]LB[qb:A][pd:B]C['a' gives some points.
 After 'a' there's aji inside Black, after 'b' it's inside White.
+]
 (;W[qb]
 ;B[pd]
 ;W[nc]
 ;B[pj]LB[kd:A][re:B]C['a' settles the position, 'b' starts a fight.
+]
 (;W[kd])
 (;W[re]
 ;B[rd]
 ;W[rg]
 ;AW[qo][dp][pq]AB[cd][jq]C[The continuation shows in reversed color and twice mirrored, how the groups ran out in the first game of the 6th Meijin, Cho Chikun 9P - Kato Masao 9P, Sep 9th-10th, 1891.
+]
 ;B[qf]
 ;W[oi]
 ;B[ri]
 ;W[qh]
 ;B[rh]
 ;W[qg]
 ;B[mc]
 ;W[me]
 ;B[mh]
 ;W[nf]
 ;B[oh]
 ;W[pi]
 ;B[le]
 ;W[lf]
 ;B[ke]
 ;W[kf]
 ;B[je]
 ;W[kh]
 ;B[ki]
 ;W[ji]
 ;B[kj]
 ;W[qj]
 ;B[qk]
 ;W[pk]
 ;B[oj]
 ;W[rk]
 ;B[ql]
 ;W[rj]
 ;B[ni]
 ;W[pl]
 ;B[pm]
 ;W[nj]
 ;B[ok]
 ;W[ol]
 ;B[nk]
 ;W[om]
 ;B[jf]
 ;W[jg]
 ;B[lg]
 ;W[kg]
 ;B[mk]
 ;W[hg]
 ;B[hf]
 ;W[gg]
 ;B[gf]))
 (;W[pd]
 ;B[qe]
 ;W[qb]
 ;B[pj]
 ;W[kd]))
 (;B[pd]
 ;W[pc]
 ;B[me]
 ;W[nc]
 ;B[nf]
 ;W[lc]
 ;B[pk]))))
 (;B[pg]
 ;W[oh]
 ;B[nf]
 ;W[qc]
 ;B[rc]
 ;W[ne]LB[me:b][ng:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[ng]
 ;W[me]
 ;B[pc]
 ;W[ob])
 (;B[me]C[Black 13 is unreasonable.]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[mf]
 ;W[qe]C[Black cannot save his three stones.])))
 (;W[me]
 ;B[le]
 ;W[mf]LB[pc:B][kd:A]C['a' emphasizes the top side and corner, 'b' the right side.]
 (;B[kd]
 ;W[ph]
 ;B[of]
 ;W[nd]
 ;B[mc]
 ;W[nh]
 ;B[qb]
 ;W[lh])
 (;B[pc]
 ;W[ob]
 ;B[ld]
 ;W[ph]
 ;B[of]
 ;W[nd]
 ;B[oh]))
 (;W[qc]
 ;B[pd]
 ;W[pc]
 ;B[od]
 ;W[nd]LB[nc:A][ne:B]C['a' is correct. 'b' is a mistake.]
 (;B[nc]
 ;W[ne]
 ;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qg]
 ;W[ob]
 ;B[lc])
 (;B[ne]
 ;W[nc]
 ;B[nf]
 ;W[lc])))
 (;W[ne]LB[me:d][pe:c][pf:a][qg:b]C[Black continues with 'a' to 'c'.
 Black 'd' is not recommended, but may work depending upon surrounding conditions.]
 (;B[pf]LB[qc:b][ld:c][me:a]C[White continues with 'a', 'b' or 'c'.]
 (;W[me]LB[pc:B][kd:A]C['a' leaves more aji than 'b'.]
 (;B[kd]
 ;W[mc])
 (;B[pc]
 ;W[od]
 ;B[ph]
 ;W[jd]))
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[pd]
 ;B[qe]LB[qb:a][me:b]C[White continues with 'a' or 'b'.]
 (;W[qb]LB[me:b][qj:a]C[Black continues by making an extension such as 'a'. Black 'b' is also possible depending upon circumstances.]
 (;B[qj]C[
 * Joseki *]
 ;W[dp]C[White plays elsewhere.]
 ;B[me]
 ;W[og]
 ;B[pg]
 ;W[oh]
 ;B[ph]
 ;W[oi])
 (;B[me]
 ;W[of]
 ;B[og]
 ;W[pe]
 ;B[nf]
 ;W[qf]
 ;B[oe]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi]))
 (;W[me]))
 (;B[pd]
 ;W[pc]
 ;B[nd]
 ;W[od]
 ;B[oe]C[This is a strong way to play.
 Fujisawa Shuko = Fujisawa Hideyuki and Sakata Eio played this sequence often in their Meijin tournament matches in the 1960's.]
 ;W[nf]
 ;B[nb]LB[nc:A][pg:B]C['a' is correct. 'b' sacrifices a large corner for small influence.]
 (;W[nc]
 ;B[mc]
 ;W[ob]
 ;B[ph]LB[lf:A][kg:B]C['a' or 'b' are ok.]
 (;W[lf]
 ;B[jd]
 ;W[mi]
 ;B[mb]C[Later, this is sente, White must not tenuki.]
 ;W[]
 ;B[rc]C[Or Black kills.]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[pa]
 ;W[oa]
 ;B[qb])
 (;W[kg]
 ;B[ic]
 ;W[le]
 ;B[lb]
 ;W[rd]
 ;B[re]
 ;W[rc]))
 (;W[pg]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[qf]
 ;B[ob])))
 (;W[ld]LB[pc:A][nd:B]C['a' or 'b'.]
 (;B[pc]
 ;W[mc])
 (;B[nd]
 ;W[od]
 ;B[me]
 ;W[of]
 ;B[pg]
 ;W[mb]
 ;B[lc]
 ;W[kc])))
 (;B[qg]LB[qc:c][me:b][pf:a]C[White continues with 'a' or 'b'.
 White 'a' gives White thickness, while Black gets a big corner; the result favors Black slightly.
 White 'b' emphasizes the top.
 White 'c' has been seen in at least one professional game (Rin Kaiho (B) vs. Fujisawa Shuko = Fujisawa Hideyuki (W) in the 4th Meijin league 1965--01-13).
 The move may be considered an attempt to avoid the disadvantage of White 'a'. White gets settled in the corner and Black on the right side.]
 (;W[pf]
 ;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[rf]
 ;B[od]
 ;W[pe]
 ;B[nd]
 ;W[qi]C[The result slightly favors Black.])
 (;W[me]LB[pc:B][kd:A]C['a' or 'b'.]
 (;B[kd]
 ;W[mc])
 (;B[pc]
 ;W[ld]))
 (;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a'. Both sides get settled.
 Black 'b' is a change in direction that render Black 3 and 5 superfluous.]
 (;B[qe]
 ;W[qb])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[pe]C[Black 3 and 5 has been rendered useless.])))
 (;B[pe]
 ;W[me]LB[pc:a][ld:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[ob]
 ;B[ph]
 ;W[ld])
 (;B[ld]LB[nd:B][le:A]C['a' is correct. 'b' is a mistake.]
 (;W[le]LB[kd:A][nd:C][od:B]C['a' is correct, cutting on 'b' or 'c' is not good.]
 (;B[kd]
 ;W[nd]
 ;B[gc]
 ;AW[dd]C[If White is already here, he'lll press down the Black top group and then heavily attack Black on the right side.
+]
 ;W[id]
 ;B[ic]
 ;W[hd]
 ;B[hc]
 ;W[jd]
 ;B[jc]
 ;W[ke]
 ;B[gd]
 ;W[qf]C[This continuation was played by Yi Chang Ho against Mok Jin Seok.
 ])
 (;B[od]
 ;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[kd]
 ;B[lc]
 ;W[lb])
 (;B[nd]
 ;W[od]
 ;B[oe]
 ;W[kd]
 ;B[kc]LB[jc:A][lc:B]C['a' takes an outside position, 'b' takes some stones.
+]
 (;W[jc]LB[lc:A][jd:B][ke:C]C['a', 'b' or 'c' don't help.]
 (;B[lc]
 ;W[jd]
 ;B[mb]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[kb]
 ;W[rc]
 ;B[qc]
 ;W[qb]
 ;B[pb]
 ;W[pc]
 ;B[rb]
 ;W[pa]
 ;B[rd]
 ;W[ra]
 ;B[sc]
 ;W[na]
 ;B[qi]
 ;W[jb]
 ;B[la]C[White's influence is superior.])
 (;B[jd]
 ;W[ke]
 ;B[ic]
 ;W[jb]
 ;B[kb]
 ;W[id]
 ;B[je]
 ;W[ib]
 ;B[hc]
 ;W[lc]
 ;B[lb]
 ;W[mb]
 ;B[mc]
 ;W[nc]
 ;B[lc]
 ;W[la])
 (;B[ke]
 ;W[jd]
 ;B[lf]
 ;W[kf]
 ;B[je]
 ;W[lg]
 ;B[mf]
 ;W[nf]
 ;B[mg]
 ;W[ng]
 ;B[mh]
 ;W[lc]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nc]
 ;B[lc]
 ;W[kb]))
 (;W[lc]
 ;B[jd]
 ;W[ke]
 ;B[lb]
 ;W[mc]
 ;B[mb]
 ;W[nc]
 ;B[ic]LB[qb:B][qi:A]C[Black is happy to sacrifice, as his right side lives on 'a' or 'b', which threatens a connection.
 ])))
 (;W[nd]
 ;B[le]
 ;W[lf]
 ;B[kf]
 ;W[kg]
 ;B[lg]
 ;W[mf]
 ;B[jf]
 ;W[lh]
 ;B[qh])))
 (;B[me]
 ;W[nf]LB[mf:b][qg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qg]
 ;W[mf]
 ;B[ke])
 (;B[mf]C[Black 17 is a mistake.]
 ;W[qf]
 ;B[ng]
 ;W[pe])))
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]LB[rb:b][pd:a]C[Joseki continues with 'a'. White 'b' may be possible.]
 (;W[pd]LB[qb:B][qe:A]C['a' is joseki, 'b' is a mistake.]
 (;B[qe]
 ;W[qb]
 ;B[pg]LB[rb:a][dp:b]C[Joseki continues with 'a'. But White may play elsewhere ('b').]
 (;W[rb]
 ;B[qk]C[
 * Joseki *])
 (;W[]LB[rb:a][nc:b]C[White plays elsewhere. Black continues with 'a' or 'b'.]
 (;B[rb]
 ;W[mb])
 (;B[nc]
 ;W[rb]
 ;B[ob]
 ;W[rd]
 ;B[re]
 ;W[sc]LB[od:a]C[Black can continue with 'a' or play elsewhere.]
 ;B[od]
 ;W[pc]
 ;B[pe])))
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[oe]TR[md]C[The triangled Black stone is now on a bad position.]))
 (;W[rb]C[White 6 was played by Fujisawa Shuko = Fujisawa Hideyuki against Go Seigen on July 3, 1964.]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc]C[While Black cannot be disatisfied, White has life in the corner
 and sente.]))
 (;B[pd]
 ;W[pc]
 ;B[od]LB[nc:b][nd:a]C[White continues with 'a' or 'b'. 'a' is preferable, but may lead to complications.]
 (;W[nd]LB[nc:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]C[Black 9 is somewhat passive, but Black gets excellent thickness at the expense of giving White solid territory.]
 ;W[nc]
 ;B[me]
 ;W[lc]
 ;B[pj])
 (;B[nc]
 ;W[ne]LB[mb:b][mc:a]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf]
 ;W[ng]
 ;B[ph])
 (;B[mb]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf]LB[ob:a][me:b]C[White continues with 'a' to live in the corner, or 'b' to exchange the corner for center influence.]
 (;W[ob]C[White takes the corner.]
 ;B[me]
 ;W[nf]
 ;B[mf]
 ;W[ng]
 ;B[ph])
 (;W[me]C[White chooses influence over territory.]
 ;B[ob]
 ;W[ld]
 ;B[pb]
 ;W[mc]
 ;B[nb]
 ;W[lb]
 ;B[qb]))))
 (;W[nc]
 ;B[nd]
 ;W[lc]
 ;B[pj])))
 (;W[mc]LB[lc:b][nd:a]C[Black continues with 'a' or 'b'. Black 'b' involves a ladder.]
 (;B[nd]
 ;W[nc]
 ;B[od]LB[pc:c][ld:b][pd:a]C[White continues with 'a'. White 'b' and 'c' are inferior.]
 (;W[pd]LB[pc:a][pe:b]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[pc]
 ;W[pe]
 ;B[qc]LB[lc:a][ld:b]C[White continues with 'a' or 'b'. White 'b' is fierce.]
 (;W[lc]
 ;B[rf]LB[nf:b][pg:a]C[Joseki continues with 'a'. White 'b' was played by Fujisawa Shuko = Fujisawa Hideyuki against Go Seigen in the 3rd Meijin League on July 3, 1964.]
 (;W[pg]
 ;B[mf])
 (;W[nf]C[White 'b' was played by Fujisawa Shuko = Fujisawa Hideyuki against Go Seigen in the 3rd Meijin League on July 3, 1964. The colors in the diagram shown are reversed from the actual game.]
 ;B[ld]
 ;W[kd]
 ;B[mf]
 ;W[ng]
 ;B[kf]
 ;W[ke]
 ;B[le]
 ;W[jf]
 ;B[kg]
 ;W[pj]
 ;B[dd]
 ;W[dc]
 ;B[ed]
 ;W[be]
 ;B[dg]
 ;W[ie]
 ;B[ec]
 ;W[fp]
 ;B[mp]
 ;W[hc]
 ;B[cf]
 ;W[ce]
 ;B[de]
 ;W[bf]
 ;B[ch]
 ;W[cp]
 ;B[pm]
 ;W[qg]
 ;B[rg]
 ;W[do]
 ;B[nm]
 ;W[mj]
 ;B[mg]
 ;W[qq]
 ;B[qr]
 ;W[rr]
 ;B[qp]
 ;W[rq]
 ;B[pp]
 ;W[pr]
 ;B[or]
 ;W[qs]
 ;B[nh]
 ;W[oh]
 ;B[ni]
 ;W[nj]
 ;B[oi]
 ;W[pi]
 ;B[og]
 ;W[ph]
 ;B[of]
 ;W[oj]
 ;B[qk]
 ;W[rh]
 ;B[kj]
 ;W[ml]
 ;B[dn]
 ;W[cn]
 ;B[cm]
 ;W[bo]
 ;B[bn]
 ;W[mm]
 ;B[nn]
 ;W[rp]
 ;B[qo]
 ;W[ip]
 ;B[co]
 ;W[qf]
 ;B[qe]
 ;W[cn]C[White ending up winning by 2 points.]))
 (;W[ld]C[White 12 shows ferocity.]
 ;B[nf]
 ;W[qe]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc]
 ;W[pb]
 ;B[qb]LB[jb:a][ob:b]C[White continues with 'a' to make life. White 'b' is tough.]
 (;W[jb]
 ;B[ic]
 ;W[ob]
 ;B[re]
 ;W[rf]
 ;B[se]
 ;W[pg]
 ;B[sb])
 (;W[ob]C[White 22 was played by Sakata Eio against Go Seigen in 1958.]
 ;B[re]
 ;W[rf]
 ;B[se]
 ;W[pg]
 ;B[jb]C[Black 27 stops White from getting two eyes.]
 ;W[sc]C[White 28 makes the corner a ko.])))
 (;B[pe]C[Black 9 is cowardly.]
 ;W[pc]
 ;B[qe]
 ;W[ld]))
 (;W[ld]C[White 8 gives Black the corner and solid shape.]
 ;B[pc]
 ;W[kc])
 (;W[pc]LB[ld:b][pd:a]C[Black continues with 'a' to create a moyo to the right side.
 Black 'b' is a deviation to build influence to the top side and the center and should not be used if there isn't already a stone on the top side which will become the extension from the Black wall.]
 (;B[pd]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[kd]
 ;W[lc]
 ;B[lf]LB[je:B][qk:A]C['a' may be better than 'b'.]
 (;W[qk])
 (;W[je]
 ;B[pj]))
 (;B[ld]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd]
 ;B[lc])))
 (;B[lc]C[Black 5 may involve a ladder.]
 ;W[ld]LB[kc:b][nc:a]C[Black continues with 'a'.
 Black 'b' yields significant influence, but White gets better corner territory. Black must have the ladder to play 'b'.]
 (;B[nc]C[Black must have the ladder to play this way.]
 ;W[mb]
 ;B[me]LB[nb:b][nd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]LB[kd:b][ne:a]C[Black changes direction and continues with 'a'. Black 'b' is bad.]
 (;B[ne]
 ;W[nb]
 ;B[pe]
 ;W[kd]
 ;B[qj]C[
 * Joseki *])
 (;B[kd]LB[lb:B][ne:A]C['a' or 'b'.]
 (;W[ne]
 ;B[lb]LB[nb:A][mf:B]C['a' is correct, 'b' is bad.]
 (;W[nb]
 ;B[mf]
 ;W[qf]LB[pf:A][rf:B]C[Trying to make Black live in the corner on 'a' or 'b' will give White great outside strength.])
 (;W[mf]
 ;B[le]
 ;W[nb]
 ;B[pf]))
 (;W[lb]
 ;B[le]
 ;W[ne]
 ;B[kb]
 ;W[qf]
 ;B[pf]
 ;W[pe]
 ;B[qe]
 ;W[qg]
 ;B[pb]
 ;W[og])))
 (;W[nb]C[White 10 is a mistake.]
 ;B[kd]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qg]))
 (;B[kc]LB[pe:a][qe:b]C[Black 7 gives White superior profit in the corner.
 White continues with 'a'. White 'b' is an old pattern that isn't
 necessarily favorable.]
 (;W[pe]LB[me:a][qe:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[me]
 ;W[qe]
 ;B[nc]
 ;W[ob]
 ;B[nb]
 ;W[nd]
 ;B[mb]
 ;W[qg])
 (;B[qe]C[Black 9 is unreasonably greedy.]
 ;W[me]
 ;B[nd]
 ;W[ne]LB[nc:b][od:a]C[Black may try 'a' or 'b'.]
 (;B[od]
 ;W[pd]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[oe]
 ;B[mc]
 ;W[qf])
 (;B[nc]
 ;W[od]
 ;B[nb]
 ;W[ob]
 ;B[mb]
 ;W[qg])))
 (;W[qe]LB[pd:b][pe:a]C[Black continues with 'a'. Black 'b' is not as favorable.]
 (;B[pe]
 ;W[pd]
 ;B[qf]
 ;W[re]
 ;B[rf])
 (;B[pd]C[This is an old pattern, but not favorable for Black.]
 ;W[me]
 ;B[nd]
 ;W[od]
 ;B[ne]
 ;W[oe]
 ;B[nf]
 ;W[pe])))))
 (;W[pe]LB[pd:a][qe:b]C[White 4 is a trick play, not joseki.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pd]
 ;W[od]
 ;B[oe]LB[ne:b][pf:a]C[White continues with 'a'. White 'b' is disadvantageous.]
 (;W[pf]
 ;B[of]
 ;W[pg]LB[pb:B][og:A]C[Black continues with 'a' to a favorable ko.
 Black 'b' is inferior., gives a seki]
 (;B[og]LB[qb:b][re:a][ph:c]C[White may continue wth 'a', 'b' or 'c', neither giving a favorable result.]
 (;W[re]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[ob]
 ;B[qb]
 ;W[mb]
 ;B[rd]
 ;W[kc]
 ;B[ph]
 ;W[qh]
 ;B[qi]
 ;W[pi]
 ;B[oh]
 ;W[ri]
 ;B[qg]
 ;W[qj]
 ;B[rg])
 (;W[qb]
 ;B[ph]
 ;W[rf]
 ;B[re]
 ;W[qh]
 ;B[qi]
 ;W[pi]
 ;B[oh]LB[rh:A][ri:B]C['a' is correct. 'b' is a mistake.]
 (;W[rh]
 ;B[ri]
 ;W[qj]
 ;B[rj]
 ;W[rk]
 ;B[pj]
 ;W[si]
 ;B[qk]
 ;W[sj]
 ;B[oi]
 ;W[rl]
 ;B[pb]
 ;W[pc]
 ;B[qc]LB[ob:a][rb:b]C[White may try 'a' or 'b', neither successful.]
 (;W[ob]
 ;B[rb]
 ;W[pa]
 ;B[ra])
 (;W[rb]
 ;B[ob]))
 (;W[ri]
 ;B[qg]
 ;W[qj]
 ;B[qf]))
 (;W[ph]
 ;B[pb]
 ;W[ob]
 ;B[mb]
 ;W[pc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[ra]
 ;W[re]
 ;B[rc]LB[ne:B][qe:A]C['a' is correct, 'b' doesn't work.]
 (;W[qe]
 ;B[nd]
 ;W[rd]
 ;B[nb]
 ;W[sc]
 ;B[na]
 ;W[oa]
 ;B[qa]
 ;W[sb]
 ;B[pb])
 (;W[ne]
 ;B[nd])))
 (;B[pb]
 ;W[ob]
 ;B[mb]
 ;W[pc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[ra]
 ;W[re]LB[qa:C][rc:B][nd:A]C[Black must continue with 'a'. The corner becomes a seki.
 Neither Black 'b' nor 'c' work. Black 'c' is worse, as White may mistake if Black plays 'b'.
 c3, b2, a1]
 (;B[nd]
 ;W[rc]
 ;B[rd]
 ;W[sd]
 ;B[sc]
 ;W[se]
 ;B[na]
 ;W[qe]
 ;B[rc]
 ;W[oa]
 ;B[nb]
 ;W[sb]C[And the corner is a seki.]
 ;B[nc]
 ;W[og]
 ;B[mf])
 (;B[rc]LB[ne:A][qe:B]C[White 'a' is correct.
 White 'b' is a mistake.]
 (;W[ne]
 ;B[nf]
 ;W[mc]
 ;B[lc]
 ;W[me]
 ;B[nd]
 ;W[le]
 ;B[nh]
 ;W[ld]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[na]
 ;B[qa]
 ;W[kc]
 ;B[kb]
 ;W[lb]
 ;B[la]
 ;W[ma])
 (;W[qe]
 ;B[nd]
 ;W[rd]
 ;B[nb]
 ;W[sc]
 ;B[na]
 ;W[oa]
 ;B[qa]
 ;W[sb]
 ;B[pb]))
 (;B[qa]C[Black 21 is a mistake.]
 ;W[rd]
 ;B[rc]
 ;W[qe]
 ;B[nd]
 ;W[sc]
 ;B[nb]
 ;W[sb]
 ;B[pb]
 ;W[oa]
 ;B[nc]
 ;W[qb])))
 (;W[ne]C[White 8 is a mistake.]
 ;B[of]
 ;W[nd]
 ;B[pf]
 ;W[mc]))
 (;B[qe]C[Black 5 is a mistake.]
 ;W[pf]C['a' is usual, 'b' if there is an additional White stone on the triangled position.]
 ;B[qg]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[rh]
 ;W[pg]
 ;B[qh]
 ;W[re]
 ;B[sg]
 ;W[qc]
 ;B[rd]
 ;W[jd]))
 (;W[]C[White plays elsewhere, not joseki.]
 ;B[od]
 ;W[pc]
 ;B[pd]LB[mc:B][nc:A]C['a' or 'b'.]
 (;W[nc]
 ;B[nd])
 (;W[mc]LB[lc:A][nc:B]C['a' or 'b'.]
 (;B[lc]
 ;W[nc]
 ;B[ld]
 ;W[qc]C[If Black tenukis again, the hole in his wall will be used.]
 ;W[nd]
 ;B[ne]
 ;W[nf])
 (;B[nc]
 ;W[nb]
 ;B[nd]LB[lb:A][mb:B][lc:C]C['a' or 'b'. 'c' is okay with a stone in the top left corner.]
 (;W[lb]
 ;B[lc]
 ;W[mb]
 ;B[kc]
 ;W[qc])
 (;W[mb]
 ;B[qb]
 ;W[jc])
 (;AW[dd]
 ;W[lc]
 ;B[mb]
 ;W[ob]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[rc]
 ;B[hc]
 ;W[hd]
 ;B[gd]
 ;W[gc]
 ;B[hb]
 ;W[ie]
 ;B[ge]
 ;W[fc]
 ;B[hg]
 ;W[jg]
 ;B[rd]
 ;W[rb]
 ;B[ma]LB[qc:A]C[White lives, Black kills on 'a'.]
 (;W[qc])
 (;B[qc]
 ;W[qb]
 ;B[oa]
 ;W[sc]
 ;B[na]
 ;W[sa]
 ;B[qa])))))
 (;W[qh]LB[od:A][qk:B]C['a' takes the corner, 'b' is also possible.]
 (;B[od]
 ;W[qk]
 ;B[nc])
 (;B[qk]LB[oe:B][pe:A]C['a' or 'b'.]
 (;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qf]
 ;W[pg]
 ;B[qb]LB[od:A]C[White weakness at 'a'.])
 (;W[oe]LB[pf:B][qf:A]C['a' is correct, 'b' can lead to difficulties.]
 (;B[qf]
 ;W[og]
 ;B[qb]
 ;W[oi])
 (;B[pf]LB[me:A][pe:B]C['a' is correct, 'b' is disadvantageous.]
 (;W[me]LB[pc:A][ld:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[pc]
 ;W[ob]
 ;B[ph]
 ;W[ld]
 ;B[pi])
 (;B[ld]
 ;W[pe]
 ;B[qe]
 ;W[qf]))
 (;W[pe]
 ;B[qe]
 ;W[qf]
 ;B[of]
 ;W[rf]
 ;B[ne]
 ;W[pc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pb]LB[sc:A][re:B]C['a' is better than 'b'.]
 (;B[sc]LB[ra:B][mb:A]C['a' is correct, 'b' is disadvantageous.]
 (;W[mb]LB[qa:B][oh:A]C['a' or 'b'.]
 (;B[oh]
 ;W[ra]
 ;B[qi]
 ;W[ri]
 ;B[ph]
 ;W[qj]
 ;B[qg]
 ;W[rh]
 ;B[pj]
 ;W[pi]
 ;B[oi]
 ;W[rk]
 ;B[qi]
 ;W[rj]
 ;B[ql]LB[lb:B][lc:B][rg:A]C['a' and 'b' are miai.]
 (;W[rg]
 ;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[oa]
 ;B[qa]LB[ma:A][pa:B][sa:B]C[If 'a', both live. If 'b', a seki or ko.]
 (;W[ma]
 ;B[sa])
 (;W[pa]
 ;B[ma]
 ;W[re]
 ;B[rd]
 ;W[se]))
 (;W[lc]
 ;B[rg]
 ;W[sg]
 ;B[pg]LB[re:B][rl:A]C['a' is correct, 'b' is questionable.]
 (;W[rl]
 ;B[re]
 ;W[sf]
 ;B[se]
 ;W[sh]
 ;B[rd])
 (;W[re]
 ;B[rd]
 ;W[sh]
 ;B[sf]
 ;W[se]
 ;B[sd]
 ;W[sf]
 ;B[rl]
 ;W[pd]
 ;B[sk])))
 (;B[qa]
 ;W[nf]
 ;B[oh]
 ;W[mf]
 ;B[oj]
 ;W[me]
 ;B[ri]
 ;W[ld]
 ;B[ph]))
 (;W[ra]
 ;B[nb]
 ;W[oh]
 ;B[pi]
 ;W[ph]
 ;B[ng]))
 (;B[re]
 ;W[ra]
 ;B[sc]
 ;W[mb]
 ;B[pi]
 ;W[ph]
 ;B[oh]LB[qi:A][rj:B]C[Neither 'a' nor 'b' give White a good result.]
 (;W[qi]
 ;B[oi]
 ;W[rk]
 ;B[rl]
 ;W[rj]
 ;B[qa]
 ;W[pa]
 ;B[kc]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[ql]
 ;B[pl]
 ;W[qm]
 ;B[pm]
 ;W[rm]
 ;B[nb]C[Later, Black can use the corner aji.]
 ;W[nc]
 ;B[lb]LB[lc:A][mc:B]C['a' or 'b'.]
 (;W[lc]
 ;B[mc]
 ;W[la]
 ;B[pd]
 ;W[od]
 ;B[sa]
 ;W[qa]
 ;B[na]
 ;W[ma]
 ;B[nd]
 ;W[sb])
 (;W[mc]
 ;B[lc]
 ;W[la]
 ;B[ib]))
 (;W[rj]
 ;B[qi]
 ;W[ri]
 ;B[pg]
 ;W[qg]
 ;B[ng]
 ;W[sh]
 ;B[rk]
 ;W[sj]
 ;B[lb])))))))
 (;W[pd]
 ;B[qc]
 ;W[pf]
 ;B[qe]
 ;W[nf]
 ;B[qg]
 ;W[ld]LB[mc:A][me:B]C['a' or 'b'.]
 (;B[mc]
 ;W[me]
 ;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]
 ;B[ic]
 ;W[he])
 (;B[me]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;W[mb])))
 (;B[ld]LB[lb:m][jc:p][lc:o][qc:a][md:h][nd:b][pd:c][me:g][ne:n][oe:f][pe:d][of:e][qf:i][pg:k][qg:j][dp:l]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 The two-space high pincer is most common. This pincer typifies modern Go, as it maintains balance between territory and influence, offers a plethora of options, and has few weaknesses.
 White responses range from 'a', 'b', 'c', 'd', 'e',
 'f', 'g', 'h', 'i', 'j', 'k' or 'p'. White plays elsewhere with 'l'.
 White 'm' shows White trying to live at top.
 White 'n' is not joseki.
 'o' is a big mistake.
 m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
+]
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a'. Black 'b' is not good enough.
+]
 (;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]
 ;B[pg])
 (;B[qb]LB[pe:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]LB[oe:a][pe:b]C[Black 11 completes the "plum bowl" shape.
 White continues with 'a' or 'b'.]
 (;W[oe]LB[ob:a][pf:c][dp:b]C[Black should continue with 'a'. Playing elsewhere with 'b' results in a local loss. White 'c' is an overplay that may work.]
 (;B[ob]
 ;W[nc]
 ;B[mb]C[
 * Joseki *
 The joseki ends.]
 ;W[nb]C[White's later continuation.]
 ;B[na]
 ;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[ma]
 ;W[kb]
 ;B[jc])
 (;B[]C[Black plays elsewhere; not recommended.]
 ;W[nb]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[qf])
 (;B[pf]C[White 13 is an overplay.]
 ;W[pe]
 ;B[nd]LB[od:a][ne:b]C[White continues with 'a' or 'b'.]
 (;W[od]
 ;B[ph]LB[nb:a][rf:b]C[With forcing moves at 'a' and 'b', White will have no trouble
 settling himself.])
 (;W[ne]
 ;B[nc]LB[me:A][qi:B]C['a' or 'b'.]
 (;W[me]
 ;B[kc]
 ;W[pj]LB[lb:a]C[White may hope for more from his moyo at right than Black's territory at top. Black is left with a weak point at 'a' where White may
 play in.])
 (;W[qi]))))
 (;W[pe]C[White must have the ladder at 2 to play this way.]
 ;B[nc]
 ;W[qi]
 ;B[ob]))
 (;W[pe]C[White needs a favorable ladder at 2 to play this way.]
 ;B[pc]
 ;W[pb]
 ;B[qc]
 ;W[qf]
 ;B[nc]
 ;W[od]
 ;B[ob]
 ;W[me]
 ;B[mc])))
 (;B[pd]C[Black 5 is not recommended.]
 ;W[pc]
 ;B[od]
 ;W[nd]
 ;B[ne]LB[nc:a][me:b]C[White continues with 'a', though White 'b' is possible with a favorable ladder.]
 (;W[nc]
 ;B[me]
 ;W[qj])
 (;W[me]
 ;B[nc]
 ;W[md]
 ;B[mc]LB[lc:a][nf:b]C[If the ladder off White 10 is favorable, White may play 'a'.
 Otherwise 'b' is the only move left.]
 (;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kd]LB[jc:a][mf:b]C[If the ladder off 'b' is not favorable to White, White collapses as 'a' and 'b' are miai.])
 (;W[nf]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[na]
 ;B[kc]LB[sb:a][pg:b]C[White lives with 'a' as considerable disadvantage. White 'b'
 and the corner can be killed through a ko.]
 (;W[sb]
 ;B[qh])
 (;W[pg]LB[ra:a][sb:b]C[White risks the corner. Black must play 'a', not 'b'.]
 (;B[ra]
 ;W[sb]
 ;B[pa]
 ;W[pb]
 ;B[ma]
 ;W[ob]
 ;B[qb]LB[mf:a]C[While White captures first, Black has a ko threat at 'a'.])
 (;B[sb]C[Black 23 is a mistake.]
 ;W[ra]C[White lives.]))))))
 (;W[nd]LB[pb:e][pc:c][oe:d][pf:a][pg:b][dp:f]C[Black continues with 'a', 'b', 'c', 'd' or 'e'.
 Black 'd' can result in complications.
 Black might have a reason for tenuki 'f'.
+]
 (;B[pf]LB[qb:b][jc:c][qc:a][dp:d]C[White continues with 'a', 'b' or 'c'. 'b' is the most usual.
 White playing elsewhere ('d') is unthinkable.]
 (;W[qc]
 ;B[rc]
 ;W[pd]LB[qb:b][qe:a]C[Black continues with 'a'. Black 'b' is reckless.]
 (;B[qe]
 ;W[qb]
 ;B[qj]C[
 * Joseki *])
 (;B[qb]C[Black 9 is a mistake.]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[pe]))
 (;W[qb]
 ;B[qj]LB[jc:b][id:c][nf:a][dp:d]C[
 * Joseki *
 White follows up with the jump to 'a' for influence, but a pincer at 'b' or 'c' is usual. 'd' show variations when White plays elsewhere.]
 (;W[nf]C[White aims for influence at a juncture point.]
 ;W[pg]C[If Black plays elsewhere, White can make influence.]
 ;B[qg]
 ;W[qh]
 ;B[ph]
 ;W[og]
 ;B[rh]
 ;W[qf]
 ;B[rg]
 ;W[pe]
 ;B[rf])
 (;W[jc])
 (;W[id])
 (;W[]C[White plays elsewhere.]
 ;B[mc]LB[rc:a][cq:b]C[White continues with 'a'. 'b' shows follow-up if White plays elsewhere.]
 (;W[rc]
 ;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[oe])
 (;W[]LB[ob:b][pd:a]C[White plays elsewhere. Black continues with 'a'. Black 'b' secures the top side, but does much damage on the right side.]
 (;B[pd]LB[ob:a][rc:b]C[Black 11 seems innocuous, but it is the vital point. White defends with 'a'. White 'b' is not recommended.]
 (;W[ob]
 ;B[rc])
 (;W[rc]LB[ob:a][nc:b]C[Black continues at 'a'. Black 'b' results in Black gote.]
 (;B[ob]LB[nb:a][pb:b]C[White continues with 'a'. White 'b' is out of the question.]
 (;W[nb]
 ;B[nc]
 ;W[pb]
 ;B[od]
 ;W[oa])
 (;W[pb]C[White 14 is a mistake.]
 ;B[nb]))
 (;B[nc]C[Black 13 results in Black gote, so is not good.]
 ;W[ob]
 ;B[od])))
 (;B[ob]C[Black 11 is premature.]
 ;W[nb]
 ;B[nc]LB[pb:b][pd:a]C[White continues with the tesjui of 'a'. White 'b' fails to punish Black for the mistake of Black 11.]
 (;W[pd]C[White 14 is the vital point for both players.]
 ;B[pb]
 ;W[pc]
 ;B[mb]
 ;W[qe]
 ;B[qf]
 ;W[re])
 (;W[pb]C[White 14 is a mistake. White fails to punish Black.]
 ;B[od]
 ;W[pc]
 ;B[pd])))))
 (;W[jc]
 ;B[ke]
 ;W[hd])
 (;W[]C[White plays elsewhere, a huge mistake.]
 ;B[pc]
 ;W[nf]
 ;B[ph]C[White is in trouble.]))
 (;B[pg]LB[qb:a][jc:c][qc:d][qi:b]C[White continues with 'a' to 'c'. White 'd' gives Black a favorable result.]
 (;W[qb]LB[mf:b][qk:a]C[Black continues with 'a' or 'b'.]
 (;B[qk]LB[qf:a]C[White can continue with a placement move at 'a', but this should not be played too early in the game.]
 ;W[qf]LB[pf:a][qg:b]C[Black can get thick with 'a' or sente with 'b' (with 'b', in exchange for enlarging White's corner territory).]
 (;B[pf]
 ;W[qe]
 ;B[pe]
 ;W[rd]
 ;B[pd]
 ;W[qc]
 ;B[qg])
 (;B[qg]
 ;W[qe]
 ;B[of]
 ;W[pd]))
 (;B[mf]LB[nf:b][qi:a]C[Black 'b' shows a moyo strategy. White continues with 'a'. White 'b' is just what Black wants.]
 ;W[qi]
 ;B[pl]
 ;W[oi]
 ;B[oe]))
 (;W[qi]LB[qb:a][pc:b]C[Black continues with 'a' or 'b'. Black can get sente with 'a'.]
 (;B[qb]LB[jc:b][nf:a]C[White continues with 'a'. White 'b' is also possible.]
 (;W[nf]
 ;B[oe]
 ;W[ne]
 ;B[oh]
 ;W[lf]
 ;B[id])
 (;W[jc]C[White 8 was played by Takagawa Shukaku against Rin Kaiho in the
 th Meijin Title (October 2 & 3, 1969), 5th Game.
 Did this start a fight?]
 ;B[ke]
 ;W[lb]
 ;B[id]
 ;W[jd]
 ;B[je]
 ;W[ie]
 ;B[gd]
 ;W[if]
 ;B[ic]
 ;W[ib]
 ;B[hb]
 ;W[jb]
 ;B[gf]
 ;W[fe]
 ;B[ge]
 ;W[ih]
 ;B[oe]
 ;W[ne]
 ;B[kh]
 ;W[ng]
 ;B[pi]
 ;W[pj]
 ;B[oi]
 ;W[qh]
 ;B[og]
 ;W[lf]
 ;B[jg]
 ;W[ig]
 ;B[lg]
 ;W[mg]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[pl]
 ;B[mi]
 ;W[le]
 ;B[kd]
 ;W[mc]
 ;B[gh]
 ;W[ij]
 ;B[cf]
 ;W[fb]
 ;B[ef]
 ;W[ce]
 ;B[bf]
 ;W[hc]
 ;B[hd]
 ;W[gc]))
 (;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pe]
 ;B[qf]
 ;W[nf]))
 (;W[jc]C[White 6 is possible with White support at top-left.]
 ;B[ke]
 ;W[hd]
 ;B[qb]
 ;W[nf]
 ;B[oe]
 ;W[ne]
 ;B[kg]
 ;W[nh]
 ;B[pi])
 (;W[qc]C[White 6 helps Black.]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]
 ;B[qk]))
 (;B[pc]LB[pb:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pe]
 ;B[qf]LB[pf:b][og:c][pg:a][dp:d]C[
 * Joseki *
 White continues with 'a'. White 'b' and 'c' are not recommended.
 White 'd' shows variations if White plays elsewhere.]
 (;W[pg]
 ;B[pf]
 ;W[of]
 ;B[qe]
 ;W[ng]
 ;B[oh]
 ;W[og]
 ;B[qh]
 ;W[ph]
 ;B[qi])
 (;W[pf]C[White 12 lets Black stay ahead.]
 ;B[qg]
 ;W[pg]
 ;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[pi])
 (;W[og]C[White 12 is not recommended.]
 ;B[qg]C[White has no good follow-up.])
 (;W[]LB[pf:b][qg:a]C[White plays elsewhere. Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qg]
 ;W[nf])
 (;B[pf]C[Black 13 looks severe, but gives White a chance to make good
 shape. Pushing moves like Black 13 are usually vulgar.]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[ng]
 ;W[mf])))
 (;W[pe]LB[pd:a][qe:b]C[Black continues with 'a'. While odd shape, it is the vital point.
 Black 'b' is a mistake.]
 (;B[pd]
 ;W[qe]LB[ob:b][od:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[od]
 ;W[oe]
 ;B[nc]
 ;W[mc]
 ;B[ob]LB[md:b][ne:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[ne]
 ;B[mb]
 ;W[pj])
 (;W[md]C[White 14 lets Black cut.]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[pg]
 ;B[mb]
 ;W[lc]
 ;B[mf]
 ;W[le]
 ;B[lf]))
 (;B[ob]
 ;W[oe]
 ;B[mc]
 ;W[pi]
 ;B[]C[Black plays elsewhere.]
 ;W[pb]LB[qb:a][nc:b]C[Black continues with 'a'. Black 'b' is less favorable.]
 (;B[qb]
 ;W[nb]
 ;B[nc]
 ;W[oa]
 ;B[od]
 ;W[rd])
 (;B[nc]
 ;W[rd]C[White sneaks into the corner.])))
 (;B[qe]C[Black 7 is a mistake.]
 ;W[pd]
 ;B[qc]
 ;W[pf]
 ;B[qg]
 ;W[id])))
 (;B[oe]LB[qc:b][pd:a][ne:c]TR[po]C[White continues with 'a'. White 'b' is not recommended.
 'c' is bad if there is no White help on or near the triangled position. The fourth continuation here is 'c'. With help in the lower right corner, 'c' is better than 'a'.]
 (;W[pd]LB[pe:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]LB[qc:a][pe:b]C[White continues with 'a'. White 'b' gives Black a better result.]
 (;W[qc]LB[rc:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[pe]LB[pf:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[pf]
 ;B[pg]LB[qb:a][og:b][dp:c]C[White continues with 'a' or 'b'. White 'c', playing elsewhere, is not recommended.]
 (;W[qb])
 (;W[og]
 ;B[ph]
 ;W[qb])
 (;W[]C[White plays elsewhere.]
 ;B[og]
 ;W[of]C[White must play 16 or suffer greatly.]
 ;B[ng]C[The sequence ends.]
 ;W[qg]C[White 18 is a mistake.]
 ;B[qh]
 ;W[rg]
 ;B[rf]
 ;W[rh]
 ;B[qi]LB[sf:a][ri:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sf]C[With White 24, White gets a ko.]
 ;B[se]
 ;W[rd]
 ;B[sg]
 ;W[sh]
 ;B[ri]
 ;W[sf])
 (;W[ri]C[White fills in his own liberties with 24.]
 ;B[rj]
 ;W[rd]
 ;B[sg]C[White loses.])))
 (;B[pf]C[Black 11 leads to difficult variations.]
 ;W[qf]LB[qb:a][rf:b]C[Black continues with 'a' or 'b'.]
 (;B[qb]
 ;W[pc]
 ;B[re]
 ;W[rf]
 ;B[se]
 ;W[qh]LB[me:b][mf:a]C[Black continues with 'a'. Black 'b' is a trick play that White can outplay.]
 (;B[mf]LB[nf:a][of:b]C[White continues at 'a'. White 'b' is a mistake.]
 (;W[nf]LB[ng:c][pg:a][ph:b]C[White 20 is a tesuji.
 Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[pg]LB[me:b][ne:a]C[White continues with 'a' or 'b'.]
 (;W[ne]
 ;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[mg]
 ;W[lc]
 ;B[kc]LB[lb:a][ng:b]C[White continues with 'a' or 'b'.]
 (;W[lb]
 ;B[kd])
 (;W[ng]))
 (;W[me]LB[le:b][ph:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[ph]LB[le:a][qi:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[le]
 ;B[qi]
 ;W[kd])
 (;W[qi]C[White 24 is an overplay.]
 ;B[le]
 ;W[pi]
 ;B[ng]))
 (;B[le]
 ;W[ph]
 ;B[ng]
 ;W[mg]
 ;B[lf]
 ;W[og]
 ;B[of]
 ;W[nh]
 ;B[ne]
 ;W[md]
 ;B[ng]
 ;W[rb]
 ;B[oh]
 ;W[sb]
 ;B[oi]LB[qj:a][dp:b]C[White must continue with 'a'. Playing elsewhere ('b') is a mistake.]
 (;W[qj]
 ;B[pj]LB[ri:a][qk:b]C[White must continue with 'a'. White 'b' is a mistake.]
 (;W[ri])
 (;W[qk]C[White 40 is a mistake.]
 ;B[ri]
 ;W[rh]
 ;B[qi]
 ;W[pi]
 ;B[sh]LB[rg:b][sg:c][rj:a]C[White 'a', 'b', and 'c' all fail.]
 (;W[rj]
 ;B[rg])
 (;W[rg]
 ;B[sg])
 (;W[sg]
 ;B[qg])))
 (;W[]C[White cannot afford to play elsewhere.]
 ;B[qg]
 ;W[rg]
 ;B[ri]
 ;W[rh]
 ;B[qi]
 ;W[sf]
 ;B[pi]
 ;W[sd]))))
 (;B[ph]LB[me:a][pg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[me]
 ;B[pg]
 ;W[le]
 ;B[qi]
 ;W[kd])
 (;W[pg]C[White 22 is a mistake, as it plays into Black's hands.]
 ;B[of]
 ;W[og]
 ;B[ne]
 ;W[me]
 ;B[ng]C[White has no good follow-up.]))
 (;B[ng]C[Black 21 is a mistake.]
 ;W[og]
 ;B[of]
 ;W[ne]
 ;B[pg]
 ;W[oh]
 ;B[ph]
 ;W[pi]
 ;B[oi]
 ;W[nh]
 ;B[qi]
 ;W[pj]
 ;B[qg]
 ;W[mg]))
 (;W[of]C[White 20 is a mistake.]
 ;B[pg]LB[ne:a][nf:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[ne]
 ;B[ph]
 ;W[qi]
 ;B[nf]
 ;W[og]
 ;B[nh])
 (;W[nf]
 ;B[ph]
 ;W[qi]
 ;B[mg])))
 (;B[me]LB[ne:c][nf:a][of:b]C[White 19 is a trick play. White continues with 'a'. White 'b'
 and 'c' don't work.]
 (;W[nf]
 ;B[ne]
 ;W[of]
 ;B[pg]
 ;W[oh])
 (;W[of]C[White 20 is a mistake.]
 ;B[pg]
 ;W[ne]
 ;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[nf]
 ;W[og]
 ;B[ng]
 ;W[oh]
 ;B[ni])
 (;W[ne]C[White 20 is ridiculous.]
 ;B[nf])))
 (;B[rf]
 ;W[qg]
 ;B[pg]
 ;W[qh]
 ;B[ph]
 ;W[qi]LB[qb:a][pi:b]C[Black continues with 'a' or 'b'.]
 (;B[qb]
 ;W[pc]
 ;B[rb]LB[me:b][pi:a]C[White continues with 'a'. White 'b' is not generally recommended.]
 (;W[pi]
 ;B[mf]
 ;W[lb]
 ;B[kb]
 ;W[kc]
 ;B[lc]
 ;W[jb]
 ;B[mb]
 ;W[ka]
 ;B[mc]
 ;W[kd]
 ;B[le]
 ;W[jf])
 (;W[me]LB[pi:a]C[White 22 is not recommended, as Black gets the vital point at 'a'.]
 ;B[pi]
 ;W[qj]
 ;B[ok]))
 (;B[pi]
 ;W[rb]LB[qb:a][qj:b]C[Black continues with 'a'. Black 'b' is a mistake..]
 (;B[qb]
 ;W[pc]
 ;B[re]LB[sc:b][qj:a]C[White continues with 'a'. White 'b' is small and greedy.]
 (;W[qj]
 ;B[sb]
 ;W[pj]
 ;B[mf]
 ;W[lb])
 (;W[sc]C[White 24 is a mistake.]
 ;B[qj]
 ;W[rj]
 ;B[rk]LB[sd:a]C[White cannot avoid a ko at 'a'.]))
 (;B[qj]
 ;W[sd]
 ;B[re]
 ;W[rg]
 ;B[qb]
 ;W[pc]LB[sb:a][rd:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[sb]
 ;W[rd]
 ;B[ra]
 ;W[sf]LB[pj:a]C[White can now aim at the cut at 'a'.])
 (;B[rd]C[Black 27 is a mistake.]
 ;W[sc]
 ;B[ra]
 ;W[sb]))))))
 (;B[pe]
 ;W[rc]
 ;B[ne]C[This result favors White slightly.]))
 (;W[pe]
 ;B[pf]
 ;W[qc]
 ;B[qg]
 ;W[rf]
 ;B[qf]
 ;W[rc]
 ;B[ne]C[This result slightly favors Black.]))
 (;B[pe]LB[qc:a][qe:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[qc]LB[rc:b][re:a]C[Black continues with 'a' or 'b'.]
 (;B[re]LB[rc:a][ne:b]C[White continues with 'a' or 'b'.]
 (;W[rc]
 ;B[ne]C[Black builds thickness when it works well, as White has considerable corner profit.])
 (;W[ne]LB[rc:b][nf:a]C[White gets out to the center, but at a cost. Black continues with 'a' or 'b'.]
 (;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[le]
 ;B[rc]
 ;W[kd])
 (;B[rc]
 ;W[ng]
 ;B[id]LB[od:b][qf:a]C[White should not peep at 'a', as Black will play 'b' and White is in gote.])))
 (;B[rc]C[Kajiwara Takeo 9-dan invented Black 9, an uncompromising move.]
 ;W[rd]
 ;B[qe]LB[rb:a][re:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rb]
 ;B[od]
 ;W[pc]
 ;B[re]
 ;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[le]
 ;B[mg]
 ;W[ke])
 (;W[re]C[White 12 is a mistake.]
 ;B[qb]
 ;W[pc]
 ;B[sb]LB[ra:b][qf:a]C[White continues with 'a'. White 'b' doesn't work, as Black captures the two White stones.]
 (;W[qf]
 ;B[ra])
 (;W[ra]C[White 16 is a mistake.]
 ;B[rf]))))
 (;W[qe]C[White 8 gives Black superior thickness at best.]
 ;B[qf]
 ;W[re]
 ;B[qc]
 ;W[rf]
 ;B[ne]
 ;W[pc]
 ;B[qb]LB[pb:a][qg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rd]
 ;B[md]LB[nb:a]C[Black 'a' later is sente.])
 (;W[qg]C[White 16 is a mistake.]
 ;B[nb]LB[mc:b][nc:a]C[Neither White 'a' nor 'b' work.]
 (;W[nc]
 ;B[mb]
 ;W[pb]
 ;B[pa]C[White loses the fight by one move.])
 (;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[pb]
 ;B[pa]
 ;W[oa]
 ;B[qa]
 ;W[la]LB[ka:b][na:a]C[Black continues with 'a'. Black 'b' gives White a ko.]
 (;B[na]
 ;W[ma]
 ;B[jb])
 (;B[ka]C[A ko fight ensues.]
 ;W[na]))))))
 (;W[qc]C[White 6 is a mistake in order. Black gains advantage.]
 ;B[rc]
 ;W[pd]
 ;B[qb]
 ;W[pe]
 ;B[pc]
 ;W[pb]
 ;B[qc]
 ;W[of]
 ;B[qf]
 ;W[pf]
 ;B[qg])
 (;W[ne]TR[po]C[White 6 is ridiculous only if there is no White help on or near the triangled position.]
 ;B[of]LB[pd:b][nf:a]C[White 'a' is worse than White 'b'.]
 (;W[nf]
 ;B[og]LB[qc:c][pd:b][lf:a]C[White continues with 'a' or 'b'. White 'c' is bad.]
 (;W[lf]
 ;B[id])
 (;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]LB[lb:a][mc:b]C[White cannot continue at 'a' because of Black 'b'.])
 (;W[qc]C[White 10 compounds the original mistake.]
 ;B[rc]
 ;W[pd]
 ;B[qb]LB[pe:b][qe:a]C[White may try 'a' or 'b'.]
 (;W[qe]
 ;B[pc])
 (;W[pe]
 ;B[pc]
 ;W[od]
 ;B[qf])))
 (;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[qh]LB[mc:a]C[Black still has the eye stealing move at 'a'.]))
 (;AW[po][pq]PL[W]
 ;W[ne]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[id]
 ;B[lf]
 ;W[ke]
 ;B[le]
 ;W[ng]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[lh]
 ;B[kf]
 ;W[if]
 ;B[jg]
 ;W[qk]LB[qk:22]TR[po]C[White has been pushed Black on the fifth line which is in most cases very bad. But not here, because of two reasons:
 . A Black group is on the run, and White will profit a lot from that in the middle game by harassing the group.
 . The White stone on or near the triangled position allowed White to play White 22, which is strongly reducing the Black fifth-line-territory, enlarging White's right side territory.]))
 (;B[pb]C[Black 5 is a recent innovation credited to Cho Chikun.]
 ;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[pe]
 ;W[od]
 ;B[rc]
 ;W[qe]
 ;B[rd]LB[ob:a][pf:b]C[White continues with 'a'. White 'b' is a mistake, even if the ladder works.]
 (;W[ob]
 ;B[qf]
 ;W[qb]
 ;B[rb]
 ;W[pa]TR[ld]C[Black 3, now weakened, has lost much of its original meaning.])
 (;W[pf]C[White 14 is a mistake.]
 ;B[ob]LB[mc:a]C[White now faces the prospect of Black connecting to the pincer stone (Black 3) by playing 'a'.]))
 (;B[]LB[qb:A][qf:B]C['a' is usual, but with much influence over the top side, White will start an attack on 'b'.
+]
 (;W[qb])
 (;AW[fc][fe][fg]
 ;W[qf]
 ;B[pe]
 ;W[nf]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[of]
 ;B[qg]
 ;W[ph]
 ;B[rg]
 ;W[nh]
 ;B[id]
 ;W[lb])))
 (;W[pd]LB[qc:B][qe:A]C[This play has lost popularity, as the pincer is well placed to
 counter White 4.
 'a' and 'b' are joseki. 'a' is easy, 'b' leads to more complicated
 variations.]
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[pg]C[
 * Joseki *])
 (;B[qc]LB[qe:a][pf:b]C[White continues with 'a' (joseki). White 'b' leads to a local
 loss.]
 (;W[qe]LB[pe:a][re:b]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[pe]
 ;W[re]LB[nd:b][oe:a][pf:c]C[Black continues with 'a' to 'c'.
 Black 'a' is severe.
 Black 'b' gives an equal result, allowing White to settle his stones.
 Black 'c' relies on Black playing the 2-2 point in the corner to live.]
 (;B[oe]LB[qb:b][pc:a]C[White continues with 'a' or 'b'.]
 (;W[pc]
 ;B[qb]LB[mc:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]LB[nb:B][nc:A]C[Black 'a' is joseki, 'b' is another variation.]
 (;B[nc]LB[nb:a][pb:b]C[White continues with 'a' if the ladder is unfavorable. White can only play 'b' if the ladder favors White.]
 (;W[nb]LB[mb:b][mc:a]C[Black continues with 'a' or 'b'. Black 'a' is a simple, older joseki.]
 (;B[mc]LB[mb:A][pb:B]C['a' is joseki, 'b' an older variation.]
 (;W[mb]
 ;B[lb]
 ;W[pb]LB[oa:A]C[
 * Joseki *
 Later, Black has a continuation on 'a'.])
 (;W[pb]
 ;B[mb]
 ;W[rb]))
 (;B[mb]LB[ob:a][nd:b]C[White continues with 'a', or if the ladder is favorable, 'b'.]
 (;W[ob]
 ;B[rc]
 ;W[sb]
 ;B[nd]
 ;W[sc]
 ;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh])
 (;W[nd]
 ;B[mc]
 ;W[ne]
 ;B[nf]
 ;W[od]LB[me:B][og:A]C[Black plays 'a' if White has the ladder, but destroys White on 'b', if White doesn't have the ladder.]
 (;B[og]
 ;W[me]
 ;B[lf]LB[pb:a][le:b]C[White continues with 'a'. White 'b' is reckless.]
 (;W[pb]
 ;B[le])
 (;W[le]C[Black 24 is a mistake.]
 ;B[ke]
 ;W[kd]
 ;B[mf]
 ;W[lc]
 ;B[ob]
 ;W[pb]
 ;B[na]
 ;W[md]
 ;B[pa]
 ;W[ld]
 ;B[jd]C[White has lost.]))
 (;B[me]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[oh]
 ;B[md]LB[nd:16][mf:A]C[White 16 is possible, if White has the ladder starting on 'a'.]))))
 (;W[pb]LB[oa:b][nb:a]C[Black continues with 'a' or the unusual move of 'b'.]
 (;B[nb]
 ;W[rb]
 ;B[od]
 ;W[rc])
 (;B[oa]C[Black 15 is an exquisite tesuji discovered by Suichi Masao 9-dan
 in 1959.
 The ladder is important.]
 ;W[nb]
 ;B[mb]LB[ob:a][nd:b]C[White must play 'a' if the ladder is unfavorable, but can play 'b' if the ladder is favorable.]
 (;W[ob]
 ;B[ma]
 ;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[lc]
 ;W[rb])
 (;W[nd]C[White must have the ladder to play White 18.]
 ;B[mc]
 ;W[ne]
 ;B[nf]
 ;W[od]LB[rb:d][me:a][mf:b][of:c]C[Black continues with 'a'. If Black 'b' or 'c', White 'd' and White wins the capture race.]
 ;B[me]LB[rb:a][of:b]C[White 'a' does not work. White 'b' leads to ko if White has the ladder.]
 (;W[rb]C[White 24 is a mistake.]
 ;B[pa]
 ;W[rc]
 ;B[qa])
 (;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[oh]LB[md:a][mf:b]C[Black plays 'a' if Black 21 cannot be captured in a ladder, and Black 'b' if Black 21 can be captured in a ladder.]
 (;B[md]LB[mf:a]C[If the ladder created by White 'a' is unfavorable, White loses.])
 (;B[mf]C[Black must play 31 if Black 21 can be captured in a ladder by White.]
 ;W[rg]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri]
 ;B[rf]
 ;W[sh]
 ;B[sg]
 ;W[si]
 ;B[qf]
 ;W[sf]
 ;B[se]
 ;W[sd]))))))
 (;B[nb]
 ;W[nc]
 ;B[mc]
 ;W[pb]
 ;B[nd]
 ;W[rb]))
 (;W[mc]C[White 12 is a mistake.]
 ;B[qf]
 ;W[rf]LB[nd:b][qg:a]C[Black continues at 'a'. Black 'b' is a mistake.]
 (;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qh]
 ;B[ph]
 ;W[qi]
 ;B[ri]
 ;W[rj]
 ;B[qj]
 ;W[pi]
 ;B[rk]
 ;W[pj]
 ;B[qk]
 ;W[pf]
 ;B[pg]
 ;W[of]
 ;B[nf]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[nh]
 ;W[mg]LB[mi:a][oj:b]C[White cannot play at 'a' because of Black 'b', so White is lost.])
 (;B[nd]C[Black 15 is a mistake.]
 ;W[pb]
 ;B[rd]
 ;W[qg]
 ;B[nc]
 ;W[nb]
 ;B[lb]
 ;W[mb]
 ;B[lc]
 ;W[pa]
 ;B[qa]
 ;W[sd]
 ;B[sc]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[se]
 ;W[sf]C[The result is ko.])))
 (;W[qb]LB[pb:A][pc:B]C[White 10 captures the corner. 'a' is correct. 'b' is a mistake.]
 (;B[pb]
 ;W[pc]
 ;B[rb]
 ;W[qa]LB[pa:B][ra:B][nc:A]C['a' is better than 'b'.]
 (;B[nc]
 ;W[ob])
 (;B[ra]
 ;W[rc]
 ;B[pa]
 ;W[qb]
 ;B[qa]
 ;W[rd]
 ;B[qb]
 ;W[ob]))
 (;B[pc]
 ;W[pb]
 ;B[od]
 ;W[rc]LB[nc:a][rd:b]C[Black continues with 'a' or 'b'. Black 'a' gives Black sente, while Black ends in gote with 'b'. Black loses about 20 points in the corner for the sente.]
 (;B[nc]
 ;W[ob]
 ;B[ph]
 ;W[rd]C[Black plays elsewhere in sente.])
 (;B[rd]
 ;W[sd]
 ;B[pd]
 ;W[qg]
 ;B[rb]
 ;W[sc]
 ;B[ob]
 ;W[ra]
 ;B[nc]))))
 (;B[nd]
 ;W[qb]LB[pb:b][pc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[od]
 ;B[pb]LB[ob:b][of:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[of]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[rd]
 ;W[oe]
 ;B[se]
 ;W[nh])
 (;W[ob]C[White 14 is a mistake.]
 ;B[oe]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[qa]
 ;W[oa]
 ;B[pa]
 ;W[sb]
 ;B[nc]
 ;W[ra]C[White must play ko, but...]
 ;B[sa]C[White has no ko threats.]))
 (;B[pb]C[Black 11 is a mistake.]
 ;W[pc]
 ;B[rb]
 ;W[qa]
 ;B[ra]
 ;W[rc]
 ;B[pa]
 ;W[qb]
 ;B[qa]
 ;W[rd]
 ;B[qb]
 ;W[ob]))
 (;B[pf]LB[pc:b][rd:c][qg:a]C[White continues with 'a'. White 'b' and 'c' are questionable.]
 (;W[qg]
 ;B[pg]
 ;W[qh]
 ;B[nd]LB[qb:c][pc:b][od:a]C[White continues with 'a'. White 'b' is a mistake. White 'c' gives White a low position.]
 (;W[od]
 ;B[oe]
 ;W[pb]
 ;B[qb]
 ;W[nb]LB[mb:a][mc:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mb]
 ;W[mc]
 ;B[lb]
 ;W[md]
 ;B[me]
 ;W[lc]
 ;B[kc]
 ;W[nc]
 ;B[le]
 ;W[ne]
 ;B[nf]
 ;W[kb]
 ;B[jb]
 ;W[rd]
 ;B[oa]
 ;W[pa]
 ;B[qa]
 ;W[rc]
 ;B[pc]
 ;W[ob]
 ;B[nd]
 ;W[na]LB[ka:a]C[White wins, but Black 'a' remains as sente.])
 (;B[mc]C[Black 19 is a mistake.]
 ;W[mb]
 ;B[lb]
 ;W[rd]
 ;B[rc]
 ;W[sb]LB[kc:a]C[White wins the capturing race and can later peep at 'a'.]))
 (;W[pc]C[White 14 is a mistake.]
 ;B[qb]LB[mb:a][pb:b]C[White 'a' is better than White 'b'.]
 (;W[mb]
 ;B[mc]
 ;W[pb]LB[oa:a][nb:b]C[Black continues at 'a'. Black 'b' and Black loses.]
 (;B[oa]C[Black 19 is the tesuji.]
 ;W[nb]
 ;B[lb]
 ;W[pa]
 ;B[qa]LB[nc:B][od:b][rd:a]C[Neither White 'a' nor 'b' work.]
 (;W[rd]
 ;B[nc]
 ;W[la]
 ;B[ka]
 ;W[na]C[White starts a multi-step ko that does not work.])
 (;W[nc]
 ;B[od]))
 (;B[nb]C[Black 19 is a mistake.]
 ;W[ra]C[White 20 is the tesuji; Black loses.]))
 (;W[pb]
 ;B[nc]))
 (;W[qb]
 ;B[pc]LB[pb:a][od:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[od]
 ;W[rc]
 ;B[ob]
 ;W[rd]
 ;B[nc])
 (;W[od]C[White 16 is a mistake.]
 ;B[pb]
 ;W[ob]
 ;B[rb]
 ;W[oe]LB[nf:b][ph:a]C[Black continues at 'a' or 'b'. White has a heavy eyeless group to contend with.]
 (;B[ph])
 (;B[nf]))))
 (;W[pc]
 ;B[rb]
 ;W[rd]
 ;B[rc]LB[pb:b][qg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qg]
 ;B[pb]
 ;W[ob]
 ;B[pa]LB[nd:b][pg:a]C[White minimizes dmaage by giving up the four stones and playing 'a'. White 'b' looks good, but doesn't work.]
 (;W[pg]C[White 18 is the best move.]
 ;B[ne]
 ;W[og]
 ;B[nf]
 ;W[kc]
 ;B[lc]
 ;W[lb]LB[mb:a][kd:b]C[Black continues with 'a' or 'b', depending on strategic considerations.
 Black 'a' captures the four White stones, while Black 'b' lets White live while giving Black thickness.]
 (;B[mb]
 ;W[kb]
 ;B[ma]
 ;W[kd]C[White 28 is sente. Black must respond to solidify his shape.])
 (;B[kd]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[mc]
 ;B[md]
 ;W[nc]C[White lives, but Black has thickness.]))
 (;W[nd]C[White 18 is a mistake.]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[lc]
 ;B[kc]
 ;W[kb]
 ;B[kd]
 ;W[jb]
 ;B[qi]LB[mc:a][oe:b]C[The cutting point of 'a' makes Black 'b sente, so Black can play
 the attack at 27.]))
 (;W[pb]C[White 14 is a mistake.]
 ;B[qf]))
 (;W[rd]LB[pc:b][rc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]
 ;W[pc]LB[rb:a][qf:b]C[Black continues with 'a'. White 'b' is a mistake.]
 (;B[rb]LB[rb:13][pc:12][rc:11][rd:10]C[This position is the same as White 12, Black 13 played before White 10, Black 11, see there for continuations.])
 (;B[qf]
 ;W[rb]C[Black can now be captured.]))
 (;B[pc]C[Black 11 is a mistake.]
 ;W[od]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[mc]
 ;B[qf]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[qa]
 ;W[rf]
 ;B[rg]
 ;W[ra]LB[qg:a]C[Usually this would be unreasonable for White, except that in this circumstance White has the ko threat of 'a'.]))))
 (;B[re]C[Black crawls along the "line of defeat" (the second line).]
 ;W[qf]
 ;B[rf]
 ;W[qg]))
 (;W[pf]C[White 6 results in a loss locally.]
 ;B[qe]LB[nf:a][qf:b]C[White 'a' is not very good, but White 'b' is unreasonable.]
 (;W[nf]
 ;B[qg])
 (;W[qf]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[og]LB[mf:a][qh:b]C['a' and 'b' are miai for Black.]))))
 (;W[pe]LB[pd:a][qe:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[od]
 ;B[oe]LB[md:a][ne:d][qe:b][pf:c]C[White 'a' is joseki. White 'b' and 'c' are unreasonable, as Black lives in the corner and White is left with split groups.
 White 'd' is a mistake.]
 (;W[md]LB[le:b][ne:c][of:a][pf:d]C[Black continues with 'a' to 'c'. Black 'd' is a mistake.]
 (;B[of]LB[lc:A][le:C][me:B]C['a', 'b' or 'c'.]
 (;W[lc]
 ;B[me]
 ;W[jc]
 ;B[qg])
 (;W[me]LB[lc:A][qg:B][dp:C]C[Black continues with 'a' or 'b'. Playing elsewhere 'c' is a mistake.]
 (;B[lc]
 ;W[le]
 ;B[ke]
 ;W[kf]
 ;B[je]
 ;W[qf])
 (;B[qg]LB[lc:a][dp:b]C[White continues at 'a'. White should not play elsewhere ('b').]
 (;W[lc]C[
 * Joseki *])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[lc]LB[mc:a][cq:b]C[White continues with 'a'. Playing elsewhere ('b') is a mistake.]
 (;W[mc]LB[pb:a][ic:b]C[Black continues at 'a'. Black 'b' and White settles himself.]
 (;B[pb])
 (;B[ic]C[Black 15 lets White settle himself in the corner.]
 ;W[qb]))
 (;W[]C[White plays elsewhere again, a mistake.]
 ;B[mc]C[White is in serious trouble in this corner.])))
 (;B[]C[Black plays elsewhere.]
 ;W[re]LB[qe:b][qg:a]C[Black continues at 'a'. Black 'b' is a mistake.]
 (;B[qg]LB[rd:a][qe:b]C[White continues at 'a', not 'b'.]
 (;W[rd]
 ;B[qe]
 ;W[qc])
 (;W[qe]C[White 14 is a mistake.]
 ;B[rd]))
 (;B[qe]C[Black 13 is a mistake.]
 ;W[pf])))
 (;W[le]LB[kd:A][me:B]C['a' or 'b'.]
 (;B[kd]
 ;W[ne]
 ;B[pf]
 ;W[ke]
 ;B[id]
 ;W[lb])
 (;B[me]
 ;W[ne]
 ;B[mf]
 ;W[nf]
 ;B[ng]
 ;W[nd]
 ;B[mg]
 ;W[lc]
 ;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[jc]
 ;B[id]
 ;W[qe]LB[rd:B][re:A]C['a' or 'b'.]
 (;B[re]
 ;W[og]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[rf]
 ;B[rd]
 ;W[qh]
 ;B[pi]
 ;W[ph]
 ;B[oh]
 ;W[qi]
 ;B[pb]
 ;W[pj]
 ;B[ob]
 ;W[ic]
 ;B[hd]
 ;W[gc]
 ;B[nb]
 ;W[mb])
 (;B[rd]
 ;W[re]LB[pg:B][qg:A]C['a' or 'b'.]
 (;B[qg]
 ;W[rg]
 ;B[pf]
 ;W[qf]
 ;B[se]
 ;W[rf]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[pc]
 ;B[ri]
 ;W[rc])
 (;B[pg]
 ;W[rg]
 ;B[pc]
 ;W[ob]
 ;B[pb]
 ;W[qi]
 ;B[ic])))))
 (;B[le]
 ;W[of]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[lc]
 ;B[pf]
 ;W[lf])
 (;B[ne]
 ;W[me]
 ;B[pf]LB[lc:a][nf:c][dp:b]C[White continues with 'a'. It is a serious mistake to play elsewhere ('b'). White 'c' is unreasonable.]
 (;W[lc]LB[mf:a][dp:b]C[Black continues with 'a', or plays elsewhere 'b'.]
 (;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[mg])
 (;B[]C[Black plays elsewhere.]
 ;W[nf]
 ;B[of]
 ;W[ng]
 ;B[ph]
 ;W[ni]))
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[mc]LB[lc:b][nd:a]C[White continues at 'a'. White 'b' is worse.]
 (;W[nd]
 ;B[jd])
 (;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[nd]))
 (;W[nf]C[White 12 is unreasonable.]
 ;B[mf]LB[lc:a]C[Without the White stone at 'a', Black can cut.]
 ;W[of]
 ;B[qe]
 ;W[nd]
 ;B[pe]
 ;W[lf]
 ;B[mg]
 ;W[le]
 ;B[nh]LB[oh:a]C[Black could also play at 'a'.]))
 (;B[pf]C[Black 9 is a mistake, as it gives White good shape.]
 ;W[ne]
 ;B[of]
 ;W[le]))
 (;W[qe]C[White 8 is unreasonable.]
 ;B[re]LB[rd:b][rf:a]C[White can try 'a' or 'b'.]
 (;W[rf]
 ;B[rd]
 ;W[pg]
 ;B[pc])
 (;W[rd]
 ;B[rc]
 ;W[qc]
 ;B[sd]
 ;W[pc]
 ;B[rd]
 ;W[pg]
 ;B[ne]LB[rb:b][qg:a]C[White may try 'a' or 'b'.]
 (;W[qg]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[lb]
 ;B[kb])
 (;W[rb]
 ;B[qg]
 ;W[pf]
 ;B[ph])))
 (;W[pf]C[White 8 is unreasonable.]
 ;B[ne]
 ;W[qb]
 ;B[rf]
 ;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rg]
 ;W[qi]
 ;B[rc]
 ;W[lb]
 ;B[kb]LB[nb:A][kc:C][lc:B]C[White tries to live with 'a' or 'b' or goes outside with 'c'.]
 (;W[nb]
 ;B[lc]
 ;W[mc]
 ;B[la]
 ;W[mb]
 ;B[jc])
 (;W[lc]LB[nb:B][kc:A]C['a' is usual, 'b' just gives White a cut outside.]
 (;B[kc]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[kd]
 ;W[la]
 ;B[og])
 (;B[nb]
 ;W[nc]
 ;B[kc]LB[mb:B][md:A]C['a' is correct, 'b' fails to punish.]
 (;W[md]
 ;B[me]
 ;W[kd]
 ;B[le]
 ;W[mb]
 ;B[na]
 ;W[oa]LB[qa:A][nd:B]C['a' or 'b' don't kill.]
 (;B[qa]
 ;W[nd]
 ;B[la]
 ;W[ob]
 ;B[jd])
 (;B[nd]
 ;W[qa]
 ;B[mc]
 ;W[ob]
 ;B[jd]))
 (;W[mb]
 ;B[na]
 ;W[oa]
 ;B[qa]
 ;W[md]
 ;B[me]
 ;W[nd]
 ;B[la]
 ;W[ob]
 ;B[ke])))
 (;W[kc]
 ;B[mb]
 ;W[lc]
 ;B[mc]
 ;W[kd]
 ;B[le]))
 (;W[ne]C[White 8 is a mistake.]
 ;B[of]
 ;W[md]
 ;B[le]LB[lc:a][nf:b]C[White continues with 'a' to settle himself. White 'b' is a mistake.]
 (;W[lc])
 (;W[nf]C[White 12 is a mistake.]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[id]
 ;B[lg]LB[nh:a]C[After Black 17, White must play 'a', making matters worse.]
 ;W[nh]
 ;B[oi])))
 (;B[qe]LB[pf:a][pg:b]C[White continues with 'a' or 'b'.]
 (;W[pf]
 ;B[qg]LB[qc:B][jd:A]
 (;W[jd]LB[ne:b][lf:a]C[Black continues with 'a' or 'b'.]
 (;B[lf]
 ;W[nf])
 (;B[ne]
 ;W[pd]LB[qc:b][pg:a]C[Black continues with 'a' for thickness, 'b' for territory.]
 (;B[pg]
 ;W[qf]
 ;B[rf]
 ;W[qc]
 ;B[og]
 ;W[rc])
 (;B[qc]
 ;W[pg]
 ;B[qh]C[White continues by attacking the two black stones.])))
 (;W[qc]LB[pd:C][qf:B][pg:A]C[Black 'a' influences the right side with 'a'.
 'b' takes safe territory on the right side.
 If Black has the ladder 'c' takes the corner for influence.]
 (;B[pg]
 ;W[pd]
 ;B[ng]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[rh])
 (;B[qf]
 ;W[pc]
 ;B[qj])
 (;B[pd]
 ;W[od]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[qf]
 ;B[rf]LB[rc:C][pg:A][rg:B]C['a' is correct.
 'b' depends on the ladder.
 'c' is a disaster.]
 (;W[pg]LB[rg:A][qh:B]C['a' is correct, 'b' is possible with the ladder, but not recommended.]
 (;B[rg]LB[nb:A][rc:B]C['a' takes the top side. 'b' sacrifices for a huge wall.]
 (;W[nb]
 ;B[pa]
 ;W[ob]
 ;B[rc]
 ;W[kc])
 (;W[rc]
 ;B[ob]
 ;W[pa]
 ;B[oa]
 ;W[re]
 ;B[qa]
 ;W[pb]
 ;B[pa]
 ;W[rd]
 ;B[pb]
 ;W[qh]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[mc]
 ;B[rb]
 ;W[sb]
 ;B[sc]
 ;W[sd]
 ;B[sf]
 ;W[nb]
 ;B[se]
 ;W[qj]))
 (;B[qh]
 ;W[rc]
 ;B[re]
 ;W[rb]
 ;B[ob]
 ;W[qa]
 ;B[oe]
 ;W[ne]))
 (;W[rg]
 ;B[re]
 ;W[qh]
 ;B[oe]
 ;W[ne]
 ;B[pg]
 ;W[of]
 ;B[rh]
 ;W[jc])
 (;W[rc]
 ;B[re]
 ;W[rb]
 ;B[ob]
 ;W[qa]
 ;B[oe]
 ;W[nb]
 ;B[ne]))))
 (;W[pg]
 ;B[pf]
 ;W[of]
 ;B[qf]
 ;W[ng]
 ;B[pc]
 ;W[nd]LB[id:a][oh:b]C[Black continues with 'a' or 'b'.]
 (;B[id]
 ;W[qg])
 (;B[oh]C[Black 13 prevents White from block on the right side, at the expense of being thin from Black 3.]
 ;W[og]
 ;B[qh]
 ;W[jd]
 ;B[lf]
 ;W[jf]
 ;B[lh]
 ;W[ph]
 ;B[qi]
 ;W[oj]))))
 (;W[of]LB[od:d][oe:b][qf:e][pg:c][qg:a]C[White 4 can be considered orthodox. Black responses range from 'a', 'b', 'c' or 'd'.
 Black 'e' is slow, but solid.]
 (;B[qg]LB[id:a][jd:b][ph:c]C[White continues with 'a' to 'c'.]
 (;W[id]LB[lf:B][mf:A][lg:C]C[Black continues on 'a'.
 If you know the follow-ups / punishments after Black 'b' or 'c', please email kogo@waterfire.us.]
 ;B[mf]LB[qc:a][nd:c][pd:b][pe:d]C[White continues with 'a', 'b' to 'd'.]
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]LB[pd:a][qf:b]C[White continues with 'a'. White 'b' is a trick play.]
 (;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]LB[qb:b][pf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pf]LB[qb:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[qb]
 ;B[nd]
 ;W[od])
 (;B[qb]
 ;W[qf]
 ;B[rf]
 ;W[pc]
 ;B[rd]
 ;W[oh]
 ;B[nd]
 ;W[oe]C[
 * Joseki *]
 ;B[qi]))
 (;W[qb]C[White 12 is a mistake.]
 ;B[oe]
 ;W[pe]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[ne]
 ;B[og]
 ;W[nf]
 ;B[ng]
 ;W[nd]C[White must play 22. Letting Black play 22 is terrible.]))
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]LB[oe:b][qf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qf]
 ;B[od]
 ;W[nd]
 ;B[pe]
 ;W[pf]
 ;B[ne]
 ;W[qi]LB[oe:a]C[White leaving the cut at 'a' until necessary is correct.])
 (;W[oe]C[White 16 is not recommended.]
 ;B[ob]
 ;W[nc]
 ;B[mb]
 ;W[ph])))
 (;W[qf]LB[pc:a][rf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[pg]
 ;B[od]
 ;W[qh])
 (;B[rf]C[Black 11 is just what White wants.]
 ;W[qe]
 ;B[re]
 ;W[pd]
 ;B[rd]
 ;W[nd])))
 (;B[pd]C[Black's strategy is to build thickness. White gets profit in sente.]
 ;W[pc]
 ;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[nd]))
 (;W[pd]LB[qc:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]LB[qc:A][oh:B]C['a' or 'b'.]
 (;W[qc]
 ;B[rc]LB[qc:10][rc:11][pd:8][qe:9][pf:a]C[This position is the same as White 10 and Black 11 played before White 8 and White 9. See that variation for continuation (at 'a').])
 (;W[oh]))
 (;B[qc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[rd]
 ;W[oh]LB[mh:b][pi:a]C[
 * Joseki *
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pi])
 (;B[mh]
 ;W[qh]LB[rg:a][rh:b]C[Black 'a' is correct. Black 'b' is not recommended.]
 (;B[rg]
 ;W[oj])
 (;B[rh]C[Black 19 is not recommended.]
 ;W[qi]))))
 (;W[nd]LB[pd:b][jf:a]C[Black continues with 'a' or 'b'.]
 (;B[jf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]LB[oe:b][og:a]C[Black can play 'a', but because of the diagonal move (White 8),
 Black cannot play 'b'.]
 (;B[og]LB[jc:B][jd:A][ke:C]C[Black 15 seals White in, but White lives comfortably.
 Continuations in the middle top side later:
 Black 'a' or White 'b'. White 'c' is not recommended.]
 (;B[jd]
 ;W[jc])
 (;W[jc])
 (;W[ke]
 ;B[je]))
 (;B[oe]C[Black 15 is a mistake.]
 ;W[pe]
 ;B[pf]
 ;W[nf]))
 (;B[pd]C[Black must have the ladder (shicho) to play this way.]
 ;W[le]
 ;B[me]
 ;W[md]
 ;B[ke]
 ;W[lc]
 ;B[lf]
 ;W[kc]))
 (;W[pe]C[White 8 was invented by Sakata Eio.]
 ;B[qe]LB[oh:B][ph:A]C['a' or 'b'.]
 (;W[ph]
 ;B[pg]
 ;W[og]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[mg])
 (;W[oh]
 ;B[pi])))
 (;W[jd]LB[lf:A][mf:B]C['a' or 'b'.]
 (;B[lf]LB[qc:a][jd:6][pd:b][oh:d][ph:c]C[White 'a' or 'b' follow. For 'a' and 'b', see the variations with White 6 one point more to the left. These moves give the same result as other variations. For 'a' here is given only a
 variation with a small difference at the end to White 6 one point more to the left.
 White 'c' is possible. White 'd'is not recommended..]
 (;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[od]
 ;W[nd]
 ;B[pe]
 ;W[pf]
 ;B[nc]
 ;W[qi])
 (;W[ph]LB[pg:a][qh:b]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[pg]
 ;W[og]LB[pe:b][oh:a]C[White continues with 'a' or 'b'.]
 (;B[oh]LB[pe:C][qe:A][pj:B]C['a' and 'b' are correct, 'c' is a mistake.]
 (;W[qe]LB[od:b][pd:a][pe:e][re:c][nh:d]C[Black continues with 'a' to 'e'.]
 (;B[pd]
 ;W[qf]LB[od:B][pf:A]C['a' or 'b'.]
 (;B[pf]
 ;W[pe]
 ;B[oe]
 ;W[od]
 ;B[ne]
 ;W[rd]
 ;B[ng]
 ;W[rg]
 ;B[nf]
 ;W[rh]
 ;B[re]
 ;W[rf]
 ;B[rc]LB[qc:B][se:A]C['a' or 'b'.]
 (;W[se]
 ;B[pb])
 (;W[qc]
 ;B[sd]
 ;W[pc]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;B[rd]C[Later]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[sf]))
 (;B[od]
 ;W[qh]))
 (;B[od]LB[nd:b][pf:c][qh:a]C[White continues with 'a'. White 'b' is a mistake. White 'c' is also not recommended.]
 (;W[qh]
 ;B[rg]
 ;W[pd]
 ;B[pe]
 ;W[pf]
 ;B[pc]
 ;W[qf]
 ;B[nc]
 ;W[rh])
 (;W[nd]C[White 14 is a mistake.]
 ;B[pe]
 ;W[pf]
 ;B[qf])
 (;W[pf]C[White 14 was played by Otake Hideo against Rin Kaiho in a 1973 Japanese TV game. White ends up taking a small corner, giving Black superior thickness.]
 ;B[pi]
 ;W[pd]
 ;B[pc]
 ;W[nd]
 ;B[pe]
 ;W[oe]
 ;B[pd]
 ;W[qf]
 ;B[qh]
 ;W[pb]
 ;B[ob]
 ;W[rd]
 ;B[nc]
 ;W[qc]
 ;B[oc]
 ;W[rb]
 ;B[pa]
 ;W[qb]))
 (;B[re]C[This was the most common response when this pattern first appeared.]
 ;W[pe]LB[rd:c][rf:a][pi:b]C[Black continues with 'a' to 'c'. White 'a' and 'c' are peaceful, while 'b' is fierce.]
 (;B[rf]
 ;W[qc]C[White 16 is painful for Black to endure.]
 ;B[rd]
 ;W[mg]
 ;B[oi]
 ;W[nh]
 ;B[jf])
 (;B[pi]C[Black 15 results in a severe fight.]
 ;W[nh]
 ;B[oi]
 ;W[rf]
 ;B[rd]
 ;W[qf]
 ;B[pc])
 (;B[rd]LB[mg:a][pi:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mg]
 ;B[pi]
 ;W[nh]
 ;B[oi]LB[ke:b][jf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[jf]
 ;B[lg]
 ;W[lh]
 ;B[jg]
 ;W[ke]LB[le:b][kh:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[kh]
 ;W[le]
 ;B[mf]
 ;W[me]
 ;B[li]
 ;W[mh]
 ;B[ni])
 (;B[le]C[Black 25 is not recommended.]
 ;W[kg]
 ;B[kf]
 ;W[kh]
 ;B[jc]
 ;W[ic]
 ;B[id]
 ;W[je]C[Black will not be able to make a live group with top center stones.]))
 (;W[ke]C[White 20 is not recommended.]
 ;B[le]
 ;W[kg]
 ;B[jc]
 ;W[ic]
 ;B[id]
 ;W[ie]
 ;B[hd]
 ;W[kc]
 ;B[jb]
 ;W[kd]
 ;B[kb]
 ;W[lc]
 ;B[lb]
 ;W[mc]
 ;B[gc]C[White is over-concentrated.]))
 (;W[pi]C[White 16 is a not recommended.]
 ;B[nh]
 ;W[me]LB[le:b][mf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mf]
 ;W[le]
 ;B[ke]
 ;W[kd]
 ;B[ne]
 ;W[md]
 ;B[nd]
 ;W[mc]
 ;B[nc])
 (;B[le]C[Black 19 is a mistake.]
 ;W[mg]))))
 (;B[nh]
 ;W[pd]
 ;B[re]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[rf]
 ;W[rc]
 ;B[pi])
 (;B[pe]
 ;W[nh]
 ;B[re]
 ;W[oi]
 ;B[nd]))
 (;W[pj]
 ;B[nh]
 ;W[qh]LB[pe:B][rh:A]C['a' or 'b'.]
 (;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[qc])
 (;B[pe]
 ;W[oe]
 ;B[pc]))
 (;W[pe]
 ;B[qe]
 ;W[nh]
 ;B[oi]
 ;W[mg]))
 (;B[pe]
 ;W[oe]
 ;B[oh]
 ;W[pj]
 ;B[nh]
 ;W[qh]LB[nd:a][od:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[od]
 ;B[qc]
 ;W[re]
 ;B[rf]
 ;W[pf]
 ;B[qe]
 ;W[rh]
 ;B[qf]
 ;W[pb]
 ;B[qb]LB[mc:a][mg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mc]LB[lc:a][mg:b]C[If Black 'a', White can break through. If Black 'b', White 'a', and White makes life.])
 (;W[mg]C[White 28 is a mistake in order.]
 ;B[ng]
 ;W[mc]
 ;B[mf]
 ;W[lc]
 ;B[kc]))
 (;B[od]
 ;W[nd]
 ;B[pd])))
 (;B[qh]C[Black 9 is timid.]
 ;W[pi]
 ;B[qi]
 ;W[pj]LB[lh:B][qk:A]C['a' or 'b'.]
 (;B[qk]
 ;W[pe]
 ;B[qe]LB[jf:B][lh:A]C['a' or 'b'.]
 (;W[lh]
 ;B[jf]
 ;W[hd]
 ;B[kh]
 ;W[li])
 (;W[jf]))
 (;B[lh]
 ;W[qj])))
 (;W[oh]C[White 8 incites an attack by Black.]
 ;B[oe]
 ;W[ne]
 ;B[nd]
 ;W[pe]
 ;B[od]
 ;W[pd]
 ;B[pf]
 ;W[qe]LB[pc:b][og:a]C[Black continues at 'a' or 'b'.]
 (;B[og]
 ;W[pc]
 ;B[nf])
 (;B[pc]LB[qc:a][pg:b]C[White can play 'a' to take the corner or 'b' for outside thickness.]
 (;W[qc]C[White goes for the corner.]
 ;B[pb]
 ;W[rd]
 ;B[og]LB[nf:b][nh:a]C[White can play a forcing move at 'a'. White 'b' doesn't work.]
 (;W[nh])
 (;W[nf]C[White 22 is unreasonable.]
 ;B[ng]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[me]
 ;B[lc]))
 (;W[pg]C[White goes for thickness.]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[pf]
 ;B[qc]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[mf]
 ;B[mb]
 ;W[lc]))))
 (;B[mf]
 ;W[pd]LB[qc:A][qe:B]C['a' or 'b'.]
 (;B[qc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[rd]
 ;W[oh]
 ;B[pi]
 ;W[mh])
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[pf]
 ;B[qb]
 ;W[pc]
 ;B[qf]
 ;W[oh])))
 (;W[ph]LB[pg:b][qh:a]C[Black continues with 'a' or 'b'.]
 (;B[qh]
 ;W[pi]
 ;B[qi]
 ;W[pj]LB[id:B][qk:A]C['a' is usual, 'b' is also possible to make a moyo on top,]
 (;B[qk]LB[id:b][pe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pe]
 ;B[qe]
 ;W[id]C[
 * Joseki *])
 (;W[id]C[White 12 is a mistake.]
 ;B[oe]
 ;W[ne]
 ;B[nd]
 ;W[pe]
 ;B[od]
 ;W[pd]
 ;B[pf]
 ;W[qe]
 ;B[pc]
 ;W[qc]
 ;B[pb]LB[nc:b][rd:a]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[ob])
 (;W[nc]
 ;B[md]
 ;W[qb]
 ;B[re]
 ;W[rd]
 ;B[qf]
 ;W[qd]
 ;B[og]
 ;W[nf]
 ;B[mg]
 ;W[ng]
 ;B[nh]
 ;W[oh]
 ;B[mf]
 ;W[pg]
 ;B[me]
 ;W[og]
 ;B[ni])))
 (;B[id]LB[qj:A]C[White plays locally on 'a' or tenuki to build a large moyo on the lower side.]
 (;W[qj]
 ;W[qb]C[Later.])
 (;W[]
 ;B[qk]
 ;W[ol]
 ;B[ql])))
 (;B[pg]
 ;W[og]
 ;B[oh]LB[qe:B][pi:C][pj:A]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[pj]LB[nh:a][pi:b]C[Black continues at 'a'. Black 'b' is not recommended.]
 (;B[nh]
 ;W[qh]
 ;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[mf]
 ;B[]C[Black plays elsewhere.]
 ;W[qc]
 ;B[rc]
 ;W[qe]LB[pd:b][re:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[re]
 ;W[pd]
 ;B[rd])
 (;B[pd]C[Black 20 is not recommended.]
 ;W[re]LB[qi:a]C[Black has the cut at 'a' to live, but White has the better of it.]))
 (;B[pi]C[Black 11 is not recommended, but there are circumstances where it may work. For analysis sake, assume a lower right White corner stone as shown.]
 ;W[oi]
 ;B[qh]
 ;W[nh]
 ;B[oj]
 ;W[ph]
 ;B[qi]LB[nj:a][pl:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[nj]
 ;B[ok]
 ;W[nk]
 ;B[ol]LB[id:a][nm:b]C[White continues with a pincer around 'a'. White 'b' is not recommended.]
 (;W[id]
 ;B[nl]LB[ml:A][mq:B]
 (;W[ml]
 ;B[mm]
 ;W[nm])
 (;W[mq]
 ;B[ll]
 ;W[jg]C[White plays on a large scale.]))
 (;W[nm]C[Yoshio Ishida played White 22 against Rin Kaiho in the 5th game of the 1973 12th Meijin Title match. White 22 is too mild, according to Ishida.]
 ;B[om]
 ;W[on]
 ;B[pn]
 ;W[nn]
 ;B[hc]C[Black 27 gives Black the advantage.]
 ;W[iq]
 ;B[nl]
 ;W[ml]
 ;B[qm]
 ;W[po]
 ;B[jp]
 ;W[ip]
 ;B[jo]
 ;W[io]
 ;B[jn]
 ;W[kr]
 ;B[in]
 ;W[qn]
 ;B[pm]
 ;W[rn]
 ;B[rm]
 ;W[jc]
 ;B[jd]
 ;W[kc]
 ;B[kd]
 ;W[lc]
 ;B[ic]
 ;W[lm]
 ;B[gn]
 ;W[cj]
 ;B[pc]
 ;W[ob]
 ;B[mc]
 ;W[mb]
 ;B[jb]
 ;W[kb]
 ;B[ka]
 ;W[lb]
 ;B[nc]
 ;W[md]
 ;B[nd]
 ;W[od]
 ;B[nb]
 ;W[ib]
 ;B[na]
 ;W[ja]
 ;B[ne]
 ;W[pd]
 ;B[hb]
 ;W[ia]
 ;B[re]
 ;W[qc]
 ;B[rc]
 ;W[pf]
 ;B[qb]
 ;W[df]
 ;B[cl]
 ;W[ej]
 ;B[ec]
 ;W[ed]
 ;B[dc]
 ;W[cd]
 ;B[rp]
 ;W[qq]
 ;B[gq]
 ;W[go]
 ;B[jk]
 ;W[kg]
 ;B[ig]
 ;W[ih]
 ;B[hh]
 ;W[ii]
 ;B[jg]
 ;W[kh]
 ;B[hi]
 ;W[ij]
 ;B[gg]
 ;W[eo]
 ;B[fn]
 ;W[hn]
 ;B[hm]
 ;W[ho]
 ;B[gl]
 ;W[fo]
 ;B[dp]
 ;W[dm]
 ;B[cm]
 ;W[hj]
 ;B[dl]
 ;W[il]
 ;B[ik]
 ;W[hk]
 ;B[jl]
 ;W[kf]
 ;B[ie]
 ;W[hl]
 ;B[im]
 ;W[km]
 ;B[jm]
 ;W[el]
 ;B[fl]
 ;W[em]
 ;B[fj]
 ;W[do]
 ;B[gj]
 ;W[er]
 ;B[fr]
 ;W[eq]
 ;B[dr]
 ;W[fq]
 ;B[es]
 ;W[ro]
 ;B[lk]
 ;W[kj]
 ;B[mk]
 ;W[kk]
 ;B[ll]
 ;W[kl]
 ;B[mm]
 ;W[lo]
 ;B[mi]
 ;W[mf]
 ;B[lp]
 ;W[mq]
 ;B[mp]
 ;W[np]
 ;B[lq]
 ;W[mr]
 ;B[lr]
 ;W[ls]
 ;B[jq]
 ;W[ir]
 ;B[jr]
 ;W[js]
 ;B[so]
 ;W[sn]
 ;B[sm]
 ;W[sp]
 ;B[bk]
 ;W[bj]
 ;B[cb]
 ;W[bb]
 ;B[db]
 ;W[me]
 ;B[oa]
 ;W[fi]
 ;B[gi]
 ;W[cp]
 ;B[bo]
 ;W[gr]
 ;B[fs]
 ;W[gs]
 ;B[ds]
 ;W[is]
 ;B[ba]
 ;W[bc]
 ;B[dd]
 ;W[de]
 ;B[ee]
 ;W[ef]
 ;B[ha]
 ;W[la]
 ;B[fe]
 ;W[pb]
 ;B[pa]
 ;W[fh]
 ;B[fg]
 ;W[eg]
 ;B[aj]C[White resigns.]))
 (;W[pl]LB[nj:a][pk:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nj]
 ;W[qj]
 ;B[lh]LB[ni:a][pn:b]C[White is surronded, facing hard fighting. Black 'a' helps keep White in, and later Black can look to the invasion at 'b'.])
 (;B[pk]C[Black 19 is a mistake.]
 ;W[ok]
 ;B[qj]
 ;W[nj]))))
 (;W[qe]
 ;B[pd]
 ;W[qf]
 ;B[pf]
 ;W[pe]
 ;B[oe]
 ;W[od]
 ;B[ne]
 ;W[rd]
 ;B[ng])
 (;W[pi]C[White 10 is too slow.]
 ;B[nh]
 ;W[mf]
 ;B[ok]LB[qh:a]C[The attack of Black 13 illustrates the problem with White 10.
 White 'a' is usually sente, but not a good play now.]))))
 (;B[oe]LB[ne:a][qf:b]C[White 'a' is typical, but White 'b' is conceivable if White greatly favors the right side.]
 (;W[ne]LB[nd:b][pe:a]C[Joseki continues with Black 'a'.
 Black 'b' is a trick play at best, a mistake if White plays properly.]
 (;B[pe]LB[mc:b][md:c][nd:a]C[White continues with 'a', 'b' or 'c'.]
 (;W[nd]
 ;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[le]LB[jd:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[kd]C[
 * Joseki *])
 (;B[jd]LB[qf:a][og:b][pg:c]C[White continues with 'a'. White 'b' is vulgar, but Black must respond carefully. White 'c' is unreasonable.]
 (;W[qf]LB[pf:a][og:b][ph:c]C[Black continues with 'a'.
 Black 'b' is a mistake. If Black 'b' worked, White 14 would be a bad play.
 Likewise, Black 'c', an attempt to forestall the result of Black 'b', White 'a', does not work.]
 (;B[pf]
 ;W[og]LB[pg:a][nh:b][oh:c]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[pg]
 ;W[oh]
 ;B[qi]LB[mh:B][oi:C][oj:A]C['a' is correct, 'b' is too small, 'c' too small.]
 (;W[oj])
 (;W[mh]
 ;B[oi]
 ;W[nh])
 (;W[oi]))
 (;B[nh]LB[pg:a][oh:b]C[White continues with 'a' or 'b'.]
 (;W[pg]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[oi]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[ni]
 ;W[oj])
 (;W[oh]
 ;B[oi]
 ;W[qg]LB[pg:a][qh:b][pi:c]C[Black continues with 'a'. Black 'b' is a mistake, as is 'c'.]
 (;B[pg]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[rh]
 ;W[ni]
 ;B[lg]
 ;W[oj]
 ;B[ke]
 ;W[rc]LB[qc:b][qe:a]C[White 30 is the tesuji to enable White to live in the corner.
 Black continues with 'a'. Black 'b', resisting, means death.]
 (;B[qe]
 ;W[qc])
 (;B[qc]C[Black 31 is a mistake.]
 ;W[qe]
 ;B[pd]
 ;W[rd]
 ;B[rb]
 ;W[qb]C[The familiar sacrifice and false eye tesuji.]
 ;B[pb]
 ;W[qa]
 ;B[ra]
 ;W[pc]
 ;B[pa]
 ;W[qb]
 ;B[qa]
 ;W[od]
 ;B[qb]
 ;W[sb]))
 (;B[qh]C[Black 21 is a mistake.]
 ;W[pi])
 (;B[pi]C[Black 21 is a mistake.]
 ;W[qh]
 ;B[qi]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[qe]
 ;B[pd]
 ;W[ri]
 ;B[rj]
 ;W[si]C[White is almost alive, and Black's corner stones are destined to be dead.])))
 (;B[oh]C[Black 17 is a mistake.]
 ;W[pg]
 ;B[ph]
 ;W[qg]
 ;B[qh]LB[rd:B][rh:A]C['a' is correct, 'b' a mistake.]
 (;W[rh]
 ;B[ri]
 ;W[rg]
 ;B[qj]
 ;W[rd]
 ;B[rc]
 ;W[re])
 (;W[rd]
 ;B[re]
 ;W[qe]
 ;B[rg])))
 (;B[og]C[Black 15 doesn't work.]
 ;W[pf]
 ;B[qh]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[qe]
 ;B[pd]
 ;W[rh]
 ;B[ri]
 ;W[rg]
 ;B[qi]
 ;W[sf]C[Black's corner stones die.])
 (;B[ph]C[Black 15 does not work.]
 ;W[pf]
 ;B[qh]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[qe]
 ;B[pd]
 ;W[pb]C[White is once again one move ahead in the race to capture.]))
 (;W[og]C[White 14 is bad style, but Black must respond carefully.]
 ;B[oh]
 ;W[pg]
 ;B[ph]
 ;W[qg]LB[qh:b][qi:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[nh]
 ;B[mg]
 ;W[qh]
 ;B[pj]
 ;W[ni]C[White can struggle, but should not be able to succeed.])
 (;B[qh]C[Black 19 is a mistake.]
 ;W[rh]
 ;B[ri]
 ;W[rf]
 ;B[sh]
 ;W[rg]
 ;B[qj]
 ;W[rd]
 ;B[rc]
 ;W[qe]C[White succeeds owing to Black needing to play 25 to protect against
 the cut.]))
 (;W[pg]C[White 14 is unreasonable.]
 ;B[ph]
 ;W[qh]
 ;B[pi]LB[qg:b][qi:a]C['a' and 'b' are miai.])))
 (;W[mc]LB[lc:B][nf:A]C['a' is joseki. If Black is strong on the top side, s/he can close in White in small space with 'b'.]
 (;B[nf]
 ;W[me]LB[ng:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[mf]
 ;B[ng]LB[kb:B][jd:A][dp:C]C[
 * Joseki *
 White 'a' is the best, 'b' the most solid continuation. Playing elsewhere ('c') is also possible.]
 (;W[jd])
 (;W[kb])
 (;W[]C[White plays elsewhere.]
 ;B[lc]LB[mb:a][cq:b]C[White continues with 'a'. White 'b', playing elsewhere, is conceivable, and results in ko.]
 (;W[mb]
 ;B[pb]C[White playing elsewhere with 14 is not recommended if this is the outcome of Black 15. White has a tough fight ahead in the center while Black should be able to make profit.])
 (;W[]C[White plays a second move elsewhere. A ko results.]
 ;B[mb]
 ;W[nb]
 ;B[md]
 ;W[nd])))
 (;B[ng]
 ;W[id]LB[qf:a]C[White aims at 'a'.]
 ;B[]C[Black plays elsewhere.]
 ;W[qf]
 ;B[pf]
 ;W[og]
 ;B[ph]C[Black can only play 16 with a favorable ladder.]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[pg]
 ;W[mh]))
 (;B[lc]
 ;W[nf]
 ;B[qg]))
 (;W[md]LB[le:b][nf:a]C[Black continues with 'a'. Black 'b' is just what White wants.]
 (;B[nf]LB[le:a][mf:b]C[White continues with 'a'. White 'b' is exceptionally bad.]
 (;W[le]
 ;B[mf]
 ;W[kd]
 ;B[og]
 ;W[lc])
 (;W[mf]C[White 10 is a mistake.]
 ;B[ng]
 ;W[mg]
 ;B[nh]
 ;W[lc]
 ;B[mh]))
 (;B[le]C[Black 9 is a mistake.]
 ;W[nf]
 ;B[qg]
 ;W[id]
 ;B[lg]
 ;W[oi])))
 (;B[nd]LB[od:b][pe:a]C[Black 7 is aggressive.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[pe]
 ;B[od]
 ;W[pd]LB[pc:b][pf:a]C[Black may try 'a' or 'b'.]
 (;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[qc]C[White gets a big corner. Black gets a mess.])
 (;B[pc]
 ;W[qc]
 ;B[pb]
 ;W[qe]C[White gets a favorable result.]))
 (;W[od]C[White 8 is a mistake.]
 ;B[pe]
 ;W[md]
 ;B[nf]C[Black starts a squeeze play.]
 ;W[nc]
 ;B[me])))
 (;W[qf]
 ;B[nf]
 ;W[pf]LB[od:a][ne:b]C[Black continues with 'a' or 'b'.]
 (;B[od]
 ;W[ng]
 ;B[mg]
 ;W[nh])
 (;B[ne]
 ;W[qj]
 ;B[pb])))
 (;B[pg]LB[qe:c][pf:b][og:a]C[Black 5 is provacative. White continues with 'a' or 'b', but White must have the ladder to play 'b'. White 'c' is bad timing.]
 (;W[og]LB[pf:a][ph:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[pf]LB[oe:c][pe:b][oh:a]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[oh]
 ;B[oe]
 ;W[ne]
 ;B[nd]
 ;W[od]
 ;B[pe]
 ;W[md]LB[nc:a][me:b]C[Black continues with 'a' or 'b'.]
 (;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[me]LB[mb:b][ob:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[ob]
 ;W[ph]C[
 * Joseki *])
 (;B[mb]LB[lb:b][lc:a]C[White continues with 'a'. White 'b' leaves flaws in White's thickness.]
 (;W[lc]
 ;B[lb]
 ;W[kc]C[White 22 gives White excellent thickness.]
 ;B[qi])
 (;W[lb]C[White 20 is unnecessary resistance.]
 ;B[lc]
 ;W[kb]
 ;B[ob]
 ;W[ke]
 ;B[qi]
 ;W[dp]C[White plays elsewhere.]
 ;B[le]C[Black 27 is reckless. Black captures the two white stones, but gives White a wall of thickness.]
 ;W[lf]
 ;B[mf]
 ;W[nf]
 ;B[kf]
 ;W[lg]
 ;B[kd]
 ;W[je]
 ;B[jd]
 ;W[id]
 ;B[ie]
 ;W[jf]
 ;B[ic]
 ;W[hd]
 ;B[jc]
 ;W[hc]
 ;B[jb])))
 (;B[me]
 ;W[nc]
 ;B[nf]
 ;W[nd]
 ;B[lf]
 ;W[lc]
 ;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[ic]
 ;B[qi]
 ;W[mg]
 ;B[mf]
 ;W[kh]))
 (;W[pe]LB[qc:a]C[White 8 looks reasonable, but superfluous and loses White the good play at 'a'.]
 ;B[qe]
 ;W[oh]
 ;B[ph]
 ;W[oi]
 ;B[qj]
 ;W[dp]C[White plays elsewhere.]
 ;B[od]C[The consequence of White 8 is that Black can attack.]
 ;W[nd]
 ;B[ne])
 (;W[oe]C[White 8 is timid, giving Black a superior position.]
 ;B[ph]C[In a professional game Black would have a decided advantage due to White 8.]))
 (;B[ph]C[Black 'b' is a mistake.]
 ;W[qe]
 ;B[pd]
 ;W[pf]
 ;B[od]
 ;W[oh]LB[mc:a][pi:b]C[Black continues with 'a' to capture White 2. Black 'b' is greedy and lets White 2 into play.]
 (;B[mc]
 ;W[pj]C[White's thickness compensates for the loss of the corner.])
 (;B[pi]C[Black 13 is a mistake.]
 ;W[ok]
 ;B[qk]
 ;W[nd]LB[nc:b][ne:a]C[Black continues with 'a' or 'b', neither good.]
 (;B[ne]
 ;W[nc]LB[lb:c][me:a][oe:b]C[If Black 'a' or 'b', White 'c'.])
 (;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[md]
 ;B[ob]))))
 (;W[pf]C[White must have the ladder to play this way.]
 ;B[qf]
 ;W[qg]
 ;B[qh]
 ;W[rg]LB[rf:a][rh:b]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[rh]
 ;B[qi]LB[qc:a][ph:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qc]LB[rc:b][pd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pd]
 ;W[pc]
 ;B[ri]
 ;W[og]
 ;B[ph]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[id]LB[od:a][ne:b]C[
 * Joseki *
 Note that, because of shortage of liberties, Black cannot separate White with 'a' or 'b'.])
 (;B[rc]C[Black 15 is just what White hopes for.]
 ;W[pd]
 ;B[re]
 ;W[ph]
 ;B[og]
 ;W[pi]LB[nf:a][qj:b]C[If now Black 'a', White 'b' is good enough.]))
 (;W[ph]C[White 14 is a mistake.]
 ;B[og]
 ;W[pi]
 ;B[nf]
 ;W[qj]
 ;B[oe]))
 (;B[rh]LB[rf:b][og:a]C[White continues with 'a'. White 'b' is also possible, but in that variation Black gains outstanding thickness.]
 (;W[og]
 ;B[ph]
 ;W[qe]
 ;B[rf]
 ;W[re]
 ;B[sg]
 ;W[pd])
 (;W[rf]C[Black gets nice thickness with this variation.]
 ;B[qe]
 ;W[ph]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[pi]
 ;B[nh]
 ;W[qi]
 ;B[nf]
 ;W[ne]
 ;B[mg]
 ;W[od]
 ;B[me]
 ;W[qb]
 ;B[re]
 ;W[ri]
 ;B[rb]
 ;W[pb]
 ;B[rc]
 ;W[lb]
 ;B[ra])))
 (;W[qe]C[Black 6 is a move before its time.]
 ;B[pd]
 ;W[pf]
 ;B[od]
 ;W[qg]
 ;B[mc]C[White 6 & 10 are over-concentrated.]))
 (;B[od]C[Black 5 only works when Black is strong in this area.]
 ;W[nd]LB[pc:a][ne:c][oe:b]C[Black continues with 'a'. Black 'b' is a mistake. Black 'c' is strange but possible; Black must have the ladder to play this way.]
 (;B[pc]
 ;W[oe]
 ;B[pd]LB[nb:a][md:c][me:d][mf:b]C[White continues with 'a' to 'c'. White must have the ladder to play 'a'. White 'd' is a mistake.]
 (;W[nb]LB[ne:B][qg:A]C['a' or, with the ladder, 'b'.]
 (;B[qg]
 ;W[mf])
 (;B[ne]C[If White does not have the ladder (this is not joseki).]
 ;W[me]
 ;B[nf]
 ;W[md]
 ;B[og]C[The worst that can happen is a seki in the corner.]
 ;W[pb]
 ;B[qb]
 ;W[pf]
 ;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[re]
 ;B[sg]
 ;W[rf]
 ;B[ng]
 ;W[rc]
 ;B[rd]
 ;W[sd]
 ;B[rb]
 ;W[sb]
 ;B[pa]
 ;W[ob]
 ;B[ra]
 ;W[se]
 ;B[lc]C[Black plays to bring White's 7 stones under attack. White's disadvantage is obvious.]))
 (;W[mf]LB[ob:b][nc:a]C[Black continues with 'a' or the interesting move at 'b'.]
 (;B[nc]
 ;W[mc]LB[ob:a][md:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[ob]LB[nb:B][md:A]C['a' or 'b'.]
 (;W[md]
 ;B[mb]
 ;W[lc])
 (;W[nb]))
 (;B[md]
 ;W[nb]
 ;B[ne]
 ;W[nc]
 ;B[nf]
 ;W[ng]
 ;B[me]
 ;W[og]
 ;B[kc]
 ;W[pb]
 ;B[qb]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]
 ;W[qa]
 ;B[ra]
 ;W[pa]
 ;B[rc]))
 (;B[ob]
 ;W[nc]
 ;B[nb]LB[lc:b][mc:a]C['a' and 'b' are miai.]))
 (;W[md]LB[lc:b][le:a]C[Black continues with 'a' or 'b'.]
 (;B[le]
 ;W[mf]
 ;B[qg]LB[nb:a][hd:b]C[White continues with 'a' or 'b' or elsewhere depending on the situation.])
 (;B[lc]
 ;W[mc]
 ;B[qg]
 ;W[le]
 ;B[ke]
 ;W[lf]
 ;B[jd]))
 (;W[me]C[White 10 is a mistake.]
 ;B[nc]
 ;W[mc]
 ;B[ob]LB[nb:a][md:b]C[White plays 'a' for a ko, or 'b' if White cannot hope to win
 the ko.]
 (;W[nb]
 ;B[qg]LB[md:a]C[Black waits for the right time to start the ko at 'a'.])
 (;W[md]
 ;B[mb]
 ;W[lc]LB[mf:a]C[From this position it is clear that White 10 would be better at 'a'.])))
 (;B[oe]C[Black 7 is vulgar.]
 ;W[ne]LB[nc:a][nf:b]C[Black now has a liberties problem. Black cuts at 'a' or 'b'.
 The Black cut at 'a' leads to more variations than the cut at
 'b'.]
 (;B[nc]
 ;W[mc]
 ;B[nb]LB[ob:a][lc:b][pc:d][md:c]C[White continues with 'a' to 'c'. White 'd' is unreasonable.]
 (;W[ob]
 ;B[mb]
 ;W[lc]LB[lb:b][pc:a]C[Black continues with 'a', or the severe move at 'b'.]
 (;B[pc]
 ;W[nf]LB[lb:c][md:a][dp:b]C[The drawback to this position for White is the Black cut at 'a'.
 White has a strong position to fight from, but this may change as the board develops.
 The advantage is that later White can later play the marked point after Black plays elsewhere ('b').
 Black 'c' is a mistake.]MA[pb]
 (;B[md]
 ;W[lb]
 ;B[pb]
 ;W[kd]
 ;B[le]
 ;W[jc])
 (;B[]C[Black plays elsewhere.]
 ;W[pb]
 ;B[qb]
 ;W[qe])
 (;B[lb]C[Black 17 is a mistake.]
 ;W[kc]LB[md:a]C[White 18 prevents the cut at 'a', and allows White a tough response to Black on the right side.]
 ;B[qf]
 ;W[qg]
 ;B[rg]
 ;W[pf]
 ;B[qe]
 ;W[qh]C[Black is too low.]))
 (;B[lb]
 ;W[kc]
 ;B[nf]LB[qb:b][mf:a]C[White 'a' is correct, though the continuation is tricky. White 'b' is premature.]
 (;W[mf]
 ;B[ng]
 ;W[qb]
 ;B[kb]
 ;W[jc]
 ;B[mg]
 ;W[le]
 ;B[lf]
 ;W[me]
 ;B[ke]
 ;W[md]
 ;B[jb]
 ;W[ic]LB[rb:b][rc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]
 ;W[rb]
 ;B[sb]LB[pc:b][pf:a]C[White must figure out the best way to sacrifice the four White stones. White continues with 'a'. White 'b' is a mistake.]
 (;W[pf]
 ;B[qe]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[pc]
 ;W[pb]
 ;B[re]
 ;W[ib]LB[na:a][oa:b]C[Black continues with 'a'. Black 'b' makes a ko.]
 (;B[na]C[Black 43 ensures a one-move win.]
 ;W[ph]C[White's loss in the corner is compensated for by profit from
 attacking Black in the center.])
 (;B[oa]C[Black 43 creates a ko situation.]
 ;W[na]))
 (;W[pc]C[White 34 doesn't work as planned.]
 ;B[pd]
 ;W[pa]
 ;B[ib]LB[ra:a][hc:b]C[Living with 'a' is small, while Black 'b' is bad for White.]))
 (;B[rb]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pc]
 ;W[pf]))
 (;W[qb]
 ;B[md]
 ;W[me]
 ;B[kd]LB[jc:a][mf:b]C['a' and 'b' are miai. This is what White must guard against (and does so in the other variation). From here, White is lost.])))
 (;W[lc]
 ;B[ob]
 ;W[nf])
 (;W[md]
 ;B[ob]
 ;W[ng])
 (;W[pc]C[White 12, refusing to sacrifice White 2, is a mistake.]
 ;B[mb]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pf]LB[rd:a][qf:b]C[White continues with 'a', or slightly better, 'b'.]
 (;W[rd]
 ;B[qf]
 ;W[re]
 ;B[nf]
 ;W[me]
 ;B[og]LB[lc:a][md:b]C[White 'a' is impossible because of Black 'b'. The White center stones are a burden and there is no good way to use them.])
 (;W[qf]
 ;B[pg]
 ;W[rd]
 ;B[qg]
 ;W[nf]
 ;B[md]
 ;W[nh]
 ;B[re]
 ;W[qc]
 ;B[rf]
 ;W[ob]
 ;B[pj]C[White's corner territory is barely 10 points.])))
 (;B[nf]
 ;W[pc]LB[qc:a][qe:b][mf:c]C[Black continues with 'a'. Black 'b' is mild. Black 'c' is not recommended.]
 (;B[qc]
 ;W[og]
 ;B[pd]LB[mc:a][mf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mc]
 ;B[mf]
 ;W[kc]LB[qf:a]C[White 'a' is sente.])
 (;W[mf]C[White 14 is a mistake.]
 ;B[nc]C[The two White stones are wasted.]))
 (;B[qe]
 ;W[qc])
 (;B[mf]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[mc]
 ;B[qg]
 ;W[rd]C[White's profit exceeds Black influence.])))
 (;B[ne]LB[pd:a][oe:b]C[Black must have the ladder to play this way. White continues at 'a'. White 'b' is a mistake.]
 (;W[pd]
 ;B[oe]
 ;W[pe]
 ;B[pc]
 ;W[qc]
 ;B[pb]
 ;W[qe]LB[qb:B][nc:A]
 (;B[nc]
 ;W[qb]
 ;B[ob]
 ;W[pg])
 (;B[qb]
 ;W[rc]LB[pf:a]C[Black has lost the cut at 'a'.]))
 (;W[oe]C[White 8 is a mistake.]
 ;B[pd]
 ;W[me]
 ;B[nc]
 ;W[nf]
 ;B[mc])))
 (;B[qf]LB[qc:c][jd:b][nd:d][pe:a]C[Black 5 is not joseki, being a bit slow.
 White continues with 'a' or 'b'. White 'c' and 'd' are mistakes.]
 (;W[pe]C[White 6 ensures connection between White 2 and 4.]
 ;B[qe]
 ;W[jd]
 ;B[lf]
 ;W[oh])
 (;W[jd]
 ;B[lf]LB[qc:B][pe:A]C['a' or 'b'.]
 (;W[pe]
 ;B[qe]
 ;W[oh]LB[lh:B][qi:A]C['a' or 'b'.]
 (;B[qi]
 ;W[lh]
 ;B[jf]
 ;W[hd])
 (;B[lh]
 ;W[qi]
 ;B[pc]
 ;W[pb]
 ;B[qb]))
 (;W[qc]
 ;B[od]
 ;W[pc]
 ;B[oe]))
 (;W[qc]C[White 6 is a mistake.]
 ;B[od]C[Black 7 is a a severe move.]
 ;W[pc]
 ;B[oe]C[Black gets a favorable result.])
 (;W[nd]C[White 6 is gote.]
 ;B[pb]C[Locally, Black 7 is an ideal grab of the corner.])))
 (;W[oe]LB[pf:a][qg:b]C[White 4 is standard with the one-space pincer, high or low, but it is not played with the low two- or three-space pincer. White 4 reflects a special strategy by White. Black continues with 'a' or 'b'.]
 (;B[pf]LB[qc:a][of:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]LB[qb:a][pd:b]C[White continues with 'a'. White 'b' is a mistake in this case.]
 (;W[qb]LB[pd:a][qj:b]C[White 8 is important. White continues with 'a', or simply at
 'b'.]
 (;B[pd]
 ;W[od]LB[mc:e][mf:b][pg:d][qi:a][qj:c]C[White continues with 'a', 'c', 'd' or 'e'. Black 'd' is an old pattern, not recommended, as it strengthens White. 'b' is not good.]
 (;B[qi]
 ;W[lb])
 (;B[mf]
 ;W[ng]
 ;B[pg]
 ;W[nf]
 ;B[qj]C[Black now lacks a good move at top.])
 (;B[qj]C[
 * Joseki *
 Yoshio Ishida versus Rin Kaiho, 6th game of the 13th Meijin Title,
 .]
 ;W[dh]
 ;B[hc]
 ;W[lb]
 ;B[ed]
 ;W[ec]
 ;B[fd]
 ;W[fc]
 ;B[gd]
 ;W[cd]
 ;B[bd]
 ;W[bc]
 ;B[dd]
 ;W[cc]
 ;B[fq]
 ;W[dn]
 ;B[dr]
 ;W[cq]
 ;B[iq]
 ;W[cf]
 ;B[be]
 ;W[df]
 ;B[de]
 ;W[dk]
 ;B[po]
 ;W[kd]
 ;B[ke]
 ;W[je]
 ;B[kf]
 ;W[jd]
 ;B[ef]
 ;W[qm]
 ;B[of]
 ;W[qp]
 ;B[qo]
 ;W[ro]
 ;B[rn]
 ;W[qi]
 ;B[pj]
 ;W[rp]
 ;B[qn]
 ;W[pp]
 ;B[op]
 ;W[oq]
 ;B[qq]
 ;W[rq]
 ;B[or]
 ;W[nq]
 ;B[np]
 ;W[rm]
 ;B[rr]
 ;W[rj]
 ;B[rk]
 ;W[rh]
 ;B[pl]
 ;W[qr]
 ;B[pr]
 ;W[rs]
 ;B[sr]
 ;W[mp]
 ;B[on]
 ;W[nr]
 ;B[qs]
 ;W[qf]
 ;B[pe]
 ;W[re]
 ;B[pc]
 ;W[pb]
 ;B[rd]
 ;W[sk]
 ;B[sl]
 ;W[sj]
 ;B[pi]
 ;W[ph]
 ;B[sh]
 ;W[sg]
 ;B[rg]
 ;W[qk]
 ;B[qg]
 ;W[pk]
 ;B[ok]
 ;W[ql]
 ;B[sm]
 ;W[pm]
 ;B[mo]
 ;W[rl]
 ;B[sn]
 ;W[qh]
 ;B[sf]
 ;W[ni]
 ;B[oj]
 ;W[pg]
 ;B[se]
 ;W[ng]
 ;B[nf]
 ;W[om]
 ;B[nm]
 ;W[nl]
 ;B[ol]
 ;W[nn]
 ;B[mm]
 ;W[so]
 ;B[lp]
 ;W[nk]
 ;B[lc]
 ;W[kb]
 ;B[mb]
 ;W[mc]
 ;B[nc]
 ;W[nb]
 ;B[md]
 ;W[ma]
 ;B[ib]
 ;W[jb]
 ;B[gb]
 ;W[fb]
 ;B[fo]
 ;W[jf]
 ;B[ac]
 ;W[ab]
 ;B[eh]
 ;W[di]
 ;B[cr]
 ;W[br]
 ;B[kg]
 ;W[jg]
 ;B[fm]
 ;W[kh]
 ;B[mg]
 ;W[ip]
 ;B[jq]
 ;W[bg]
 ;B[gi]
 ;W[hj]
 ;B[gj]
 ;W[hi]
 ;B[gk]
 ;W[hk]
 ;B[hh]
 ;W[ih]
 ;B[hg]
 ;W[hm]
 ;B[dm]
 ;W[cm]
 ;B[cn]
 ;W[em]
 ;B[en]
 ;W[do]
 ;B[el]
 ;W[dl]
 ;B[dq]
 ;W[bp]
 ;B[in]
 ;W[hn]
 ;B[ho]
 ;W[io]
 ;B[im]
 ;W[hp]
 ;B[go]
 ;W[kn]
 ;B[jo]
 ;W[lo]
 ;B[ln]
 ;W[jn]
 ;B[il]
 ;W[jl]
 ;B[jp]
 ;W[ik]
 ;B[hq]
 ;W[hl]
 ;B[gp]
 ;W[ko]
 ;B[mq]
 ;W[ll]
 ;B[lh]
 ;W[li]
 ;B[mi]
 ;W[lj]
 ;B[ki]
 ;W[jh]
 ;B[mj]
 ;W[nj]
 ;B[lk]
 ;W[kj]
 ;B[kk]
 ;W[jj]
 ;B[mk]
 ;W[cs]
 ;B[ek]C[Black wins by resignation.])
 (;B[pg]
 ;W[lb]
 ;B[qk])
 (;B[mc]
 ;W[me]LB[hc:C][ph:A][qi:B]C['a' or 'b' are correct. Any play on the top side like 'c' is a mistake.]
 (;B[ph])
 (;B[qi])
 (;B[hc]
 ;W[ph]
 ;B[of]
 ;W[nf]
 ;B[og]C[Black in bad shape.])))
 (;B[qj]LB[pd:c][qe:a][dp:b]C[White could attack at 'a', or play elsewhere ('b'). White 'c', prompting Black 'a', is weak.]
 (;W[qe]
 ;B[pe]
 ;W[rd]
 ;B[pd]
 ;W[re]
 ;B[od]
 ;W[nc]
 ;B[nd]C[Black's thickness is better than White's profit.])
 (;W[dp]C[White plays elsewhere.]
 ;B[pe]C[Black 11 is the recommended follow-up locally.])
 (;W[pd]C[White gives Black a "thank-you" move.]
 ;B[qe])))
 (;W[pd]C[White 8 is a mistake.]
 ;B[qe]
 ;W[qb]
 ;B[qj]LB[nd:a]C[White 4 is wrongly placed. It should be at 'a'.]))
 (;B[pd]C[Black 7 is a mistake.]
 ;W[pc]
 ;B[od]
 ;W[nd]LB[nc:b][ne:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne]
 ;W[me]
 ;B[nf]
 ;W[md])
 (;B[nc]C[Black 11 is a mistake.]
 ;W[mc]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[of]C[Black's shape is thin.])))
 (;W[of]C[White 6 is a mistake.]
 ;B[pg]C[White makes Black crawl along the fourth line, the "line of victory".]))
 (;B[qg]LB[qc:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[qc]
 ;B[rc]
 ;W[qb]LB[nd:b][pd:a]C[Black normally plays 'a', but 'b' is playable.]
 (;B[pd]
 ;W[od]LB[qi:a][dp:b]C[Black must reinforce at 'a', so is dissatisfied. Playing elsewhere ('b') is a mistake.]
 (;B[qi])
 (;B[]C[Black plays elsewhere, a mistake.]
 ;W[re]
 ;B[rd]
 ;W[qf]
 ;B[pf]
 ;W[rg]
 ;B[qh]
 ;W[rh]LB[pe:a][qi:b]C[Black continues with 'a'. Black cannot play 'b'.]
 (;B[pe]
 ;W[qi])
 (;B[qi]C[Black 19 is unreasonable.]
 ;W[pe]
 ;B[qe]
 ;W[rf]
 ;B[ri]
 ;W[rb])))
 (;B[nd]
 ;W[od]
 ;B[re]LB[lb:B][mb:A]
 (;W[mb]
 ;B[kc])
 (;W[lb]C[White 12 at 'a' is also feasible.])))
 (;W[pf]C[White gets settled quickly, but he should only play this way when driven by necessity, as all the subtlety is taken out of
 the position.]
 ;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb])))
 (;W[me]LB[md:f][nd:e][od:a][le:d][pf:b][qg:c]C[White 4 is typical of the severity of modern Go. White must have a position in the top-left corner to play this way. Black continues
 with 'a', 'b' or 'c'. Black 'd' indicates a special strategy.
 Black 'e' and 'f' are unreasonable.]
 (;B[od]LB[nc:c][md:a][nd:d][pd:b]C[White continues with 'a', 'b' or 'c'. White 'd' is a mistake.]
 (;W[md]LB[nc:b][pc:a]C[Black continues with 'a'. Black 'b' is vulgar.]
 (;B[pc]LB[ob:a][lc:c][nc:b][oe:d]C[White continues with 'a'.
 White 'b' is a bit heavy.
 White 'c' is the old joseki pattern. White 'c' is less favorable
 because White does not get as much territory as in variation
 'a'.
 White 'd' is not recommended, as it results in a relatively insecure
 position for White.]
 (;W[ob]LB[pb:b][mc:a]C[Black continues with 'a'. Black 'b' is submissive.]
 (;B[mc]LB[lc:b][nd:a]C[White continues with 'a'. White 'b' looks better than it is.]
 (;W[nd]LB[nc:b][oe:a]C[Black continues with 'a'. Black 'b' is not recommended, as it gives White favorable thickness in return for capturing two stones.]
 (;B[oe]
 ;W[lc]LB[pb:b][kc:a]C[
 * Joseki *
 Black continues with 'a' or 'b'.]
 (;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb])
 (;B[pb]LB[kc:a][dp:b]C[White continues with 'a'. White cannot afford to play elsewhere.]
 (;W[kc]
 ;B[jc]C[This is a follow-on (1-177).]
 ;W[jd]
 ;B[id])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[mb]
 ;W[lb]
 ;B[kd]LB[jc:a][nc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[jc]
 ;B[na]LB[oa:b][nc:a]C[White must play 'a'. White 'b', Black 'a' and White is captured.]
 ;W[nc]
 ;B[oa]C[White is split in two.])
 (;W[nc]C[White 18 is a mistake.]
 ;B[kb]
 ;W[nb]
 ;B[kc]
 ;W[ma]LB[oa:a]C[Black has sente, and can take away White's second eye with 'a'.]))))
 (;B[nc]C[Black 11 is not recommended. Blac gets two stones, White gets
 superior thickness.]
 ;W[oe]
 ;B[pd]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[nb]
 ;W[na]
 ;B[mb]
 ;W[kb]
 ;B[pb]
 ;W[ke]))
 (;W[lc]C[White 10 is not recommended.]
 ;B[lb]
 ;W[kc]
 ;B[nd]
 ;W[mb]
 ;B[nc]
 ;W[kb]
 ;B[nb]
 ;W[la]))
 (;B[pb]C[Black 9 is a mistake.]
 ;W[oe]LB[nd:b][pe:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]
 ;W[nd]LB[pd:a][og:b]C[If Black 'a', White 'b'. If Black allows White 'a', Black does
 not have a good reply.])
 (;B[nd]C[Black 11 is stolid.]
 ;W[ne]
 ;B[nc]
 ;W[mc]
 ;B[nb])))
 (;W[nc]C[White 8 is not recommended.]
 ;B[oe]
 ;W[lc])
 (;W[lc]C[White 8 is the old joseki pattern. This play is less favorable
 because White 8 onto the marked point would give White more territory.]MA[ob]
 ;B[nc]
 ;W[mc]LB[ob:a][dp:b]C[Black should capture at 'a'. 'b' shows White's follow-up when
 Black plays elsewhere.]
 (;B[ob])
 (;B[]C[Black plays elsewhere.]
 ;W[ob]
 ;B[nb]
 ;W[nd]LB[pb:b][oe:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[oe]
 ;W[pb]
 ;B[qb]
 ;W[mb]C[The capture is big, but Black has sente (and has played another
 move elsewhere as well).])
 (;B[pb]C[Black 15 gives White a favorable result.]
 ;W[oe]
 ;B[pd]
 ;W[qf]C[White may continue here or elsewhere as fits the overall board
 position.])))
 (;W[oe]C[White 8 is not recommended, as it results in a relatively insecure
 position for White.]
 ;B[nc]
 ;W[mc]
 ;B[ob]LB[jd:a]C[White has an insecure position. Further, Black has a good follow-up
 with a play at 'a'.]))
 (;B[nc]C[Black 7 is a mistake.]
 ;W[mc]
 ;B[pc]
 ;W[jd]))
 (;W[pd]
 ;B[pe]
 ;W[pc]LB[qc:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[qc:b][qe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qe]LB[qc:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]
 ;W[qb]LB[rb:A][re:B]C['a' is correct, 'b' is inferior.]
 (;B[rb]
 ;W[re]
 ;B[pb]LB[ob:a][rc:b]C[White continues with 'a'. White 'b', a pattern that predates
 White 'a', is an overplay.]
 (;W[ob]
 ;B[qa]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[pf]
 ;B[oe]C[This joseki was a favorite of Kajiwara Takeo 9-dan.]
 ;W[of]C[
 * Joseki *
 Continuation, but White most often switches elsewhere.])
 (;W[rc]C[White 16 is not recommended.]
 ;B[qa]
 ;W[rd]
 ;B[qb]LB[md:a][pf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[md]
 ;B[nc]
 ;W[pf]
 ;B[ob])
 (;W[pf]C[White 20 is out of order.]
 ;B[oe]
 ;W[md]
 ;B[mc]LB[lc:b][of:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[of]
 ;B[nc])
 (;W[lc]
 ;B[nc]))))
 (;B[re]
 ;W[qf]
 ;B[rb]
 ;W[oe]
 ;B[pf]
 ;W[ne]
 ;B[nc]LB[rf:B][pg:A]C[Later White 'a' or 'b'.]))
 (;B[qf]C[Black 11 is a mistake.]
 ;W[re]
 ;B[pf]
 ;W[rd]
 ;B[nc]))
 (;W[qc]C[White 10 is inconsistent with the aim of sacrificing the three
 stones in the corner for the outside.]
 ;B[re]LB[rb:b][rd:a]C[White continues with 'a'. White 'b' is also possible.]
 (;W[rd]
 ;B[qe]
 ;W[mb]
 ;B[md])
 (;W[rb]
 ;B[of]
 ;W[mb]
 ;B[md])))
 (;B[qc]LB[mc:A][qe:B]C['a' or 'b'.]
 (;W[mc]
 ;B[oe]
 ;W[md]LB[nb:B][qg:A][qi:C]C['a' or 'c' for safety, 'b' to attack.]
 (;B[qg]
 ;W[id]C[
 * Joseki *])
 (;B[nb]
 ;W[nc]
 ;B[lc])
 (;B[qi]
 ;W[kb]))
 (;W[qe]
 ;B[nd]LB[qc:9][nd:11]C[Continuation see previous variation Black 11 before Black 9.])))
 (;W[nc]LB[pc:a][oe:b]C[White 6 is a bit slack from a shape standpoint, but it avoids
 complications. White must have the ladder to play this way.
 Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[oe]LB[nd:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[md]
 ;B[mc]
 ;W[ne]
 ;B[pd]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[ob]
 ;W[ma]
 ;B[nb]
 ;W[kd])
 (;B[pe]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg]
 ;W[oh]
 ;B[qi]))
 (;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[le]))
 (;W[nd]C[White 6 is a mistake.]
 ;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[le]
 ;B[jd]
 ;W[lc]
 ;B[kc]LB[lb:a][md:b]C[White continues with 'a'. White 'b' is pathetic.]
 (;W[lb])
 (;W[md]C[White 14 is a mistake.]
 ;B[lb]
 ;W[kd]
 ;B[ke]C[White can't afford to connect, but if he cuts anywhere, the ko is so big that Black will ignore any ko threat.])))
 (;B[pf]LB[qc:b][jd:c][md:a][le:d]C[Black 5 emphasizes the right side. White continues with 'a' or 'b'. White 'c' is a bit unreasonable locally, but may make
 strategic sense. White 'd' is a mistake.]
 (;W[md]LB[lc:b][qj:a]C[Black continues with 'a' or 'b'. Black 'b' is a tough-minded move.]
 (;B[qj]C[
 * Joseki *])
 (;B[lc]C[White 7 shows fighting spirit.]
 ;W[mc]
 ;B[pc]
 ;W[jd]C[A likely continuation.]
 ;B[ke]
 ;W[mg]))
 (;W[qc]LB[rc:a][pd:b]C[Black continues with 'a'. Black 'b' gives White a large corner profit to questionable outside strength.]
 (;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[le]
 ;B[jd])
 (;B[pd]
 ;W[pc]
 ;B[md]LB[nd:a][od:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[ne])
 (;W[od]
 ;B[oe]
 ;W[ne]
 ;B[nd]LB[nf:a]C[White 4 should be at 'a'. White is in for a rough ride.])))
 (;W[jd]LB[pc:b][le:a]C[Black 'a' takes up the challenge, while Black 'b' is a steady move that avoids fighting for the moment.]
 (;B[le]
 ;W[lf]
 ;B[ke]C[Black 5 is an a good place to give White trouble.])
 (;B[pc]
 ;W[od]
 ;B[ph]))
 (;W[le]C[White 6 gives Black a large corner.]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]LB[jd:a]C[White 6 would be now be better placed at 'a'.]))
 (;B[qg]LB[jd:a][pf:b]C[White 'a' and 'b' are possible continuations.]
 (;W[jd]LB[nd:c][pe:a][pf:b]C[Because White retains forcing moves at 'a' and 'b', Black cannot play 'c'.])
 (;W[pf]
 ;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[jd]LB[jc:a][le:b][lf:c]C[If Black 'b', White 'c' is severe. Rather than fight where White is strong, Black usually tries to settle himself with 'a'.]
 ;B[jc]))
 (;B[le]C[There is no point in Black 5 unless he has the upper right corner, but White does not make the shoulder hit unless he has strength at the top left.]
 ;W[mf]
 ;B[lf]LB[qf:b][mg:a]C[White continues with 'a' or 'b'. White 'b' is a fighting move.]
 (;W[mg]
 ;B[kh]
 ;W[qf]
 ;B[pc]
 ;W[pe]
 ;B[ob]
 ;W[nb]
 ;B[nc]
 ;W[od]
 ;B[mb]
 ;W[pb]
 ;B[na]
 ;W[qc]LB[fc:a][fe:b]C[The result cannot be assessed without accounting for the top-left corner. If White has the top-left star point, the result may be considered equal. White has no reason for dissatisfaction in this case. If Black 'a', White 'b' negates Black's thickness.
 If Black has a favorable position at top-left, White has a tough game ahead.])
 (;W[qf]
 ;B[pe]
 ;W[pf]
 ;B[oe]
 ;W[md]
 ;B[of]LB[mg:a]C[If White 'a', White risks losing the two White stones.]
 ;W[mg]
 ;B[ph]C[White is likely to attack the three Black stones at left.]))
 (;B[nd]C[Black 5 is a mistake.]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[md])
 (;B[md]C[Black 5 is a mistake.]
 ;W[nd]
 ;B[ne]
 ;W[oe]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[qf]LB[lf:a]C[Although Black's corner stone retains some aji (potential), Black must ensure capture of White 4 (possibly with a play at 'a').]))
 (;W[md]LB[mc:b][le:a][me:c]C[White makes a "belly attachment" to the Black pincer. Locally the play is not advantageous, but may produce a reasonable whole board result.
 Typically the result is a Black wall facing the left side (from Black 3), with White emphasizing the top and right. This is consistent with the proverb "attaching to a stone makes it stronger".
 Black continues with 'a' to 'c'.]
 (;B[le]
 ;W[me]
 ;B[lf]LB[mf:b][qf:a]C[White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pc]
 ;W[pe]
 ;B[ob]
 ;W[nb]
 ;B[nc]
 ;W[od]
 ;B[mb]
 ;W[pb]
 ;B[na]
 ;W[qc]LB[qb:a][dp:b]C[
 * Joseki *
 The joseki ends, but Black retains the play at 'a'. Black may
 also play elsewhere ('b').]
 (;B[qb]
 ;W[pd]LB[pa:a][rc:b]C[Black 'a' diminishes White's corner. Black 'b' is most tenacious.]
 (;B[pa]
 ;W[rb]
 ;B[pc]
 ;W[rc])
 (;B[rc]
 ;W[pc]
 ;B[pa]
 ;W[rb]
 ;B[ra]C[Black gets a "flower-viewing" ko (nothing to lose).]))
 (;B[]LB[lc:a]C[Black plays elsewhere. White may try 'a'.]
 ;W[lc]LB[kc:a][mc:b]C[Black continues with 'a' or 'b'.]
 (;B[kc]LB[lb:b][mc:a]C[White must play 'a'. White 'b' is hopeless.]
 (;W[mc]
 ;B[lb])
 (;W[lb]C[White 22 is a mistake.]
 ;B[mc]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ib]))
 (;B[mc]
 ;W[kc]
 ;B[jd])))
 (;W[mf]LB[lg:a][qg:b]C[Black continues with 'a'. Black 'b' is timid.]
 (;B[lg]
 ;W[qf]
 ;B[pc]
 ;W[ob]LB[pb:a][pf:b]C[Black 'a' is solid. Black 'b' provokes a fight.]
 (;B[pb]
 ;W[pe]
 ;B[rf]LB[re:b][rg:a]C[White continues with 'a' or 'b'.]
 (;W[rg]
 ;B[re]
 ;W[qh])
 (;W[re]
 ;B[qe]
 ;W[rd]
 ;B[pf]LB[pd:b][qg:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qg]
 ;B[oe]
 ;W[pg]
 ;B[od]
 ;W[lc]
 ;B[kc]
 ;W[of]
 ;B[rc]
 ;W[rg]
 ;B[mc]
 ;W[nc]
 ;B[mb]
 ;W[nd])
 (;W[pd]C[White 20 is a mistake.]
 ;B[qg]
 ;W[qc]
 ;B[qf]
 ;W[qb]
 ;B[mg]C[Black 25 is a superb point. White's corner is small, and Black's influence commanding.])))
 (;B[pf]
 ;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[of]
 ;W[qg]
 ;B[oe]
 ;W[od]
 ;B[pd]
 ;W[og]
 ;B[ng]
 ;W[nf]
 ;B[pb]
 ;W[mg]
 ;B[nh]
 ;W[mh]
 ;B[ni]
 ;W[pj]
 ;B[nk]C[Fighting continues from here.]))
 (;B[qg]C[Black 9 is a mistake.]
 ;W[lc]
 ;B[kc]
 ;W[lg]
 ;B[kg]
 ;W[kh]C[Black thickness has been erased.])))
 (;B[mc]LB[nd:a][me:b]C[White continues with 'a' or 'b'.]
 (;W[nd])
 (;W[me]
 ;B[nc]
 ;W[od]))
 (;B[me]LB[nd:a][pe:b]C[White continues with 'a', possbily 'b'.]
 (;W[nd]
 ;B[le]LB[pe:a][of:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[pf]
 ;W[of]
 ;B[qf]
 ;W[qg]
 ;B[og]
 ;W[nf]
 ;B[oh]
 ;W[qi]LB[pc:a][pi:b]C[Black can play 'a', taking th corner, but 'b' is even stronger.]
 (;B[pc]
 ;W[mg])
 (;B[pi]
 ;W[rh]
 ;B[rg]
 ;W[qh]
 ;B[mg]LB[qb:b][lc:a]C[White continues with 'a'. White 'b' is premature.]
 (;W[lc]C[White 24 is essential.]
 ;B[kc]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[ra]
 ;W[mb]C[A possible continuation.]
 ;B[lb]
 ;W[mc]LB[rf:a][dp:b]C[Black continues with 'a'. Black 'b' is a serious mistake.]
 (;B[rf]
 ;W[pj]
 ;B[mh]LB[jd:a]C[White may extend down the right side, while Black plays at 'a'.])
 (;B[]C[Black plays elsewhere, a grievous error.]
 ;W[rc]
 ;B[qc]
 ;W[sb]
 ;B[rd]
 ;W[sc]LB[sd:b][sf:a]C[Black must play 'a'. Black 'b' is a mistake.]
 (;B[sf])
 (;B[sd]C[Black 38 is a mistake.]
 ;W[rf]C[Black dies with one eye.])))
 (;W[qb]C[White 24 is a mistake.]
 ;B[pc]
 ;W[pb]
 ;B[od]LB[nb:a][ne:b]C[White 'a' loses only three stones. White 'b' loses them all.]
 (;W[nb]
 ;B[ne])
 (;W[ne]
 ;B[nc]
 ;W[ob]
 ;B[mc]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[mb]C[Black is one liberty ahead (that's all it ever takes).]))))
 (;W[of]
 ;B[qg]LB[id:a]C[White has a difficult position. Black has a share of the corner and side, and thickness on the outside. Meanwhile, White will struggle while Black profits at tormenting White.
 If White had played 8 (the two-space jump), and Black responded with 9, White would not have played 4, attaching to the pincer stone (3). Instead, White would have played a pincer (such as 'a').]))
 (;W[pe]
 ;B[qe]LB[pf:a][pg:b]C[White continues with 'a'. White 'b' is also possible, though strategically advanced.]
 (;W[pf]
 ;B[qf]
 ;W[pg]
 ;B[nd]
 ;W[qg]
 ;B[mc]
 ;W[od]
 ;B[qb]C[White continues with an extension or approach move on the right side.])
 (;W[pg]C[1967 (6th) Meijin Title, Game 3: White: Sakata Eio, Honinbo; Black: Rin Kaiho, Meijin]
 ;B[qf]
 ;W[mc]LB[fd:a][pf:b]C[Black continues with 'a'. If Black 'b'....]
 (;B[fd]LB[ed:a][de:b]C[White continued with 'a', avoiding a disadvantageous fight with 'b'.]
 (;W[ed]C[1967 (6th) Meijin Title, Game 3: White: Sakata Eio, Honinbo; Black: Rin Kaiho, Meijin - continued]
 ;B[ee]
 ;W[de]
 ;B[df]
 ;W[dd]
 ;B[ef]
 ;W[cf]
 ;B[be]
 ;W[bf]
 ;B[bc]
 ;W[cc]
 ;B[ch]
 ;W[bd]
 ;B[cg]
 ;W[ae]
 ;B[jp]
 ;W[dm]
 ;B[ge]
 ;W[le]
 ;B[pf]
 ;W[ne]
 ;B[mq]
 ;W[eo]
 ;B[gp]
 ;W[go]
 ;B[hp]
 ;W[cn]
 ;B[do]
 ;W[dn]
 ;B[ck]
 ;W[dk]
 ;B[dj]
 ;W[ej]
 ;B[ek]
 ;W[dl]
 ;B[fj]
 ;W[ei]
 ;B[gk]
 ;W[cj]
 ;B[di]
 ;W[bj]
 ;B[qn]
 ;W[ql]
 ;B[on]
 ;W[nq]
 ;B[mp]
 ;W[qb]
 ;B[qi]
 ;W[pi]
 ;B[qh]
 ;W[pj]
 ;B[pp]
 ;W[qq]
 ;B[mf]
 ;W[ke]
 ;B[nd]
 ;W[jc]
 ;B[qj]
 ;W[ol]
 ;B[nj]
 ;W[nk]
 ;B[qo]
 ;W[po]
 ;B[op]
 ;W[np]
 ;B[oo]
 ;W[pq]
 ;B[mj]
 ;W[mk]
 ;B[mo]
 ;W[lj]
 ;B[li]
 ;W[ki]
 ;B[mh]
 ;W[kj]
 ;B[od]
 ;W[nc]
 ;B[pc]
 ;W[pb]
 ;B[bo]
 ;W[lh]
 ;B[mi]
 ;W[no]
 ;B[nn]
 ;W[pm]
 ;B[pn]
 ;W[mm]
 ;B[qk]
 ;W[pk]
 ;B[nr]
 ;W[or]
 ;B[mr]
 ;W[rp]
 ;B[mn]
 ;W[fl]
 ;B[fk]
 ;W[hh]
 ;B[gh]
 ;W[mg]
 ;B[ng]
 ;W[lg]
 ;B[nf]
 ;W[ph]
 ;B[nh]
 ;W[dq]
 ;B[ep]
 ;W[dp]
 ;B[co]
 ;W[cq]
 ;B[bq]
 ;W[br]
 ;B[ar]
 ;W[dr]
 ;B[cs]
 ;W[rk]
 ;B[hg]
 ;W[ig]
 ;B[ih]
 ;W[hi]
 ;B[hf]
 ;W[qg]
 ;B[rg]
 ;W[rj]
 ;B[rh]
 ;W[jh]
 ;B[jd]
 ;W[kd]
 ;B[ic]
 ;W[jb]
 ;B[ib]
 ;W[id]
 ;B[rm]
 ;W[rl]
 ;B[fo]
 ;W[en]
 ;B[if]
 ;W[jg]
 ;B[fb]
 ;W[bn]
 ;B[cr]
 ;W[rc]
 ;B[bk]
 ;W[sf]
 ;B[rd]
 ;W[sd]
 ;B[se]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[qc]
 ;W[sc]
 ;B[oi]
 ;W[ak]
 ;B[ca]
 ;W[eb]
 ;B[ea]
 ;W[fc]
 ;B[gb]
 ;W[gc]
 ;B[hc]
 ;W[ia]
 ;B[hd]
 ;W[bb]
 ;B[gn]
 ;W[kn]
 ;B[ij]
 ;W[ii]
 ;B[ln]
 ;W[lm]
 ;B[ko]
 ;W[jn]
 ;B[jl]
 ;W[in]
 ;B[il]
 ;W[kl]
 ;B[bg]
 ;W[cd]
 ;B[bi]
 ;W[ao]
 ;B[bp]
 ;W[bl]
 ;B[ro]
 ;W[os]
 ;B[sp]
 ;W[sq]
 ;B[so]
 ;W[rr]
 ;B[rb]
 ;W[ra]
 ;B[ha]
 ;W[ja]
 ;B[ba]
 ;W[fa]
 ;B[da]
 ;W[gi]
 ;B[fi]
 ;W[gl]
 ;B[hl]
 ;W[oj]
 ;B[oh]
 ;W[ie]
 ;B[el]
 ;W[fm]
 ;B[io]
 ;W[hn]
 ;B[ho]
 ;W[jj]
 ;B[sl]
 ;W[jk]
 ;B[hk]
 ;W[ns]
 ;B[ms]
 ;W[lf]
 ;B[jf]
 ;W[je]
 ;B[gd]
 ;W[ec]
 ;B[fn]
 ;W[hm]
 ;B[of]
 ;W[kf]
 ;B[nm]
 ;W[nl]
 ;B[ci]
 ;W[cl]
 ;B[ai]
 ;W[ag]
 ;B[ah]
 ;W[cb]
 ;B[hb]
 ;W[an]
 ;B[bs]
 ;W[ap]
 ;B[aq]
 ;W[af]C[Black wins by 6 points.])
 (;W[de]C[This fight would be difficult for White.]
 ;B[dd]
 ;W[ed]
 ;B[cd]LB[le:a]C[Black will lead the fighting to the right, where he can effectively use a connection at 'a'.]))
 (;B[pf]
 ;W[ne])))))
 (;W[qf]LB[od:a][pe:b]C[The White pincer puts pressure on Black 1 to settle White 2.
 Black usually answers at 'a', but 'b' is possible.]
 (;B[od]LB[pc:a][nd:b][pd:c]C[White continues with 'a' or 'b'. 'c' is a mistake.]
 (;W[pc]
 ;B[pd]
 ;W[qc]LB[nc:b][rc:c][nd:a]C[Black continues with 'a' to 'c'.]
 (;B[nd]LB[mb:a][pj:b]C[White continues with 'a' or 'b'.]
 (;W[mb]
 ;B[qj])
 (;W[pj]C[If White wants to prevent Black from extending on the right side, he plays 10.]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]))
 (;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[md]
 ;W[ma]
 ;B[pj])
 (;B[rc]C[Black takes a territory oriented approach, and gets a little thin in doing so.]
 ;W[rb]
 ;B[rd]
 ;W[lb]
 ;B[qj]))
 (;W[nd]C[White gets a bit greedy with 6, as he aims at also living in the corner.]
 ;B[oe]
 ;W[pc]
 ;B[qe]LB[qc:a][ne:b]C[White continues with 'a'. White 'b' leads to bad shape.]
 (;W[qc]LB[ne:a][qj:b]C[Black continues with 'a' or 'b'.]
 (;B[ne]LB[pj:a][qj:c][pk:b]C[White extends to 'a', possibly 'b' or 'c'.]
 (;W[pj]C[
 * Joseki *]
 ;B[nc]C[Continuation.]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[kc]
 ;B[lc]
 ;B[rc]C[Later, Black can threaten the life of the White group.]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[re]
 ;W[pa])
 (;W[pk]C[1972 9th Pro Best Ten Playoff, Game 3 - White: Yoshio Ishida; Black: Iwata
 White played 12, stretching the extension from 4 to pincer the Black stone in the lower right corner.]
 ;B[pi]LB[nq:a]C[Black 13 surprised White, who expected Black to pincer around 'a'.]
 ;W[np])
 (;W[qj]))
 (;B[qj]
 ;W[ne]C[Black 11 prevents White from making the first play down the right side.]
 ;B[og]
 ;W[nf]
 ;B[pg]
 ;W[id]))
 (;W[ne]
 ;B[nf]
 ;W[me]
 ;B[qc]C[Black 13 robs White of his base.]))
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[qe]
 ;W[nd]
 ;B[oe]))
 (;B[pe]
 ;W[pf]LB[oe:b][of:a]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[of]
 ;W[og]
 ;B[oe]
 ;W[ph]LB[pb:a][mc:b]C[Black must decide how to tackle the corner. 'a' is solid, but lets White play under Black 3. Black 'b' is another possibility.]
 (;B[pb]
 ;W[lb])
 (;B[mc]
 ;W[rc]
 ;B[rd]
 ;W[qb]LB[nb:b][qc:a]C[Black continues with 'a' or 'b'. In either case, White can live in the corner (at least through ko) or get to the center.]
 (;B[qc]LB[ra:a][rb:b]C[White continues with 'a'. White 'b' and White dies.]
 (;W[ra]LB[sb:b][sc:a]C[Black 'a' for a ko. Black 'b' and White lives.]
 (;B[sc]
 ;W[sb])
 (;B[sb]C[Black 17 is a mistake. White lives.]
 ;W[sc]))
 (;W[rb]
 ;B[nb]C[White dies.]))
 (;B[nb]
 ;W[ob]
 ;B[pc]
 ;W[pb]
 ;B[ra]LB[nc:b][od:c][ne:a]C[Black 19 takes away eye shape, but White can play 'a', as 'b' and 'c' are sente for White. The position for fighting in the center determines the outcome.])))
 (;B[oe]C[Black 7 shows a lack of fighting spirit.]
 ;W[of]
 ;B[ne]LB[rc:b][qj:a]C[White can emphasize the side with 'a', or live in the corner with 'b'.]
 (;W[qj]
 ;B[mc]LB[kc:a][rd:b]C[White 'a' is sente, and White can reduce the corner with 'b'.])
 (;W[rc]
 ;B[rd]
 ;W[qc]
 ;B[mc]
 ;W[nb]
 ;B[pj]
 ;W[mg]))))
 (;W[qg]LB[od:a][pe:b]C[White should have the ladder to play the two-space pincer. Black can answer at 'a' or 'b'.]
 (;B[od]LB[nd:c][pd:b][qj:a]C[White continues with 'a', 'b' or 'c'. White plays 'a' as part of a fuseki strategy; locally it is a loss. White plays 'b' with a favorable ladder.]
 (;W[qj]C[White 6 if it helps the lower right, but this results in a loss in the local context of the joseki.]
 ;B[pc])
 (;W[pd]LB[pc:b][pe:a]C[Black continues with 'a'. If Black plays 'b' when the ladder favors White, Black is sadly mistaken.]
 (;B[pe]
 ;W[pc]LB[oe:B][re:A]C['a' or 'b'.]
 (;B[re]LB[mc:c][nc:a][md:b][nd:d]C[White continues with 'a', 'b' or 'c'. White 'd' is a mistake.]
 (;W[nc]LB[qc:c][nd:b][me:a]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[me]
 ;W[rc]LB[ne:a][og:b]C[White can aim at the severe move at 'a'. Black probably needs an immediate reinforcement at 'b'.])
 (;B[nd]
 ;W[md]
 ;B[me]
 ;W[mc]LB[lc:b][le:a]C[Black continues with 'a'. Black 'b' is an overplay, as the White cut at 'a' presents difficulty.]
 (;B[le]LB[kb:a][pk:b]C[White continues with 'a'. White 'b' is possible, at a cost.]
 (;W[kb]
 ;B[pj]C[
 * Joseki *])
 (;W[pk]
 ;B[lc]
 ;W[rb]
 ;B[rc]
 ;W[sb]
 ;B[mb]LB[nb:b][qb:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qb]LB[kb:a]C[Black 'a' is sente.])
 (;W[nb]C[White 22 is a mistake.]
 ;B[qb]
 ;W[qc]
 ;B[pb]C[White cannot live.])))
 (;B[lc]
 ;W[le]
 ;B[ne]
 ;W[lb]
 ;B[kb]
 ;W[ma]
 ;B[jc]
 ;W[rc]
 ;B[pj]
 ;W[oh]))
 (;B[qc]
 ;W[oe]
 ;B[pf]
 ;W[ne]))
 (;W[md]LB[nd:a][le:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[mc:b][nc:a]C[White continues with 'a' or 'b'.]
 (;W[nc]
 ;B[me]
 ;W[mc]
 ;B[le]
 ;W[kb])
 (;W[mc]
 ;B[me]LB[lb:a][lc:b]C[White continues with 'a' or 'b'. White 'b' is played only if the right side is important.]
 (;W[lb]LB[le:a][pj:b]C[Black continues with 'a' or 'b'.]
 (;B[le]LB[jc:b][qc:a]C['a' and 'b' are miai.]
 ;W[pk])
 (;B[pj]LB[le:a]C[If Black values the lower right enough to suffer the cut at 'a'.]
 ;W[le]
 ;B[mf]
 ;W[ke]))
 (;W[lc]LB[kd:a][le:b]C[Black continues with 'a' for thickness or 'b' to take a vital point on the right side.]
 (;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[pk])
 (;B[le]
 ;W[kc]
 ;B[pj]))))
 (;B[le]
 ;W[oe]LB[of:b][pf:a]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[mf])
 (;B[of]
 ;W[ne]
 ;B[nf]
 ;W[pf]
 ;B[qe]
 ;W[ph]
 ;B[mc]
 ;W[nc]
 ;B[qc]
 ;W[lb]C[The result cannot be fully evaluated in the local context.])))
 (;W[mc]LB[lc:b][ne:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[ne]
 ;W[lc]
 ;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[pk]
 ;B[jc])
 (;B[lc]C[Black 11 is not recommended.]
 ;W[oe]LB[nd:b][pf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pf]
 ;W[nd]C[White has the initiative.])
 (;B[nd]C[Black 13 is a mistake.]
 ;W[md]
 ;B[ne]
 ;W[me]LB[pf:a]C[White plays 16. White avoids playing the atari at 'a'.])))
 (;W[nd]C[White 10 demonstrates an ignorance of the principles of Go. White is easily forced into bad shape.]
 ;B[oe]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[qc]
 ;W[mc]LB[og:a]C[Black follows up locally with 'a'.]))
 (;B[oe]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[rd]
 ;B[pg]))
 (;B[pc]C[Black 7 is a mistake.]
 ;W[pe]
 ;B[nc]
 ;W[qc]
 ;B[ob]LB[pb:b][qb:a]C[White continues with 'a'. White 'b' is ko food.]
 (;W[qb]LB[pf:a][qf:b]C[If later Black 'a', White must give way with 'b'.])
 (;W[pb])))
 (;W[nd]
 ;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[ne]LB[nf:b][pg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pg]LB[le:b][mf:a]C[White continues with 'a' or 'b'.]
 (;W[mf]
 ;B[ph]C[
 * Joseki *])
 (;W[le]
 ;B[ke]
 ;W[lf]
 ;B[kd]
 ;W[qh]
 ;B[nf]
 ;W[md]
 ;B[jg]
 ;W[lh]))
 (;B[nf]C[Black 11 is a mistake.]
 ;W[mf]LB[me:a][ng:b]C[Black 'a' is no good. Black 'b', slightly better.]
 (;B[me]
 ;W[of]LB[nc:a][ng:b]C[Black may try 'a' or 'b'.]
 (;B[nc]
 ;W[ng]
 ;B[md]
 ;W[nf]
 ;B[pd]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[kc]LB[na:a]C[The White atari at 'a' should be saved as a ko threat, as it is playable anytime.])
 (;B[ng]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[qf]
 ;B[of]
 ;W[nc]LB[qb:b][lc:a]C['a' and 'b' are miai for White.]))
 (;B[ng]
 ;W[le]
 ;B[mg]
 ;W[lg]
 ;B[lh]
 ;W[kg]C[White has nice shape.]))))
 (;B[pe]LB[qb:B][qj:A]C['a' is joseki, 'b' only, if White is strong on the top side.]
 (;W[qj]LB[pc:a][nd:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]C[
 * Joseki *])
 (;B[nd]LB[lb:b][qb:a]C[White can live with 'a', and the side is open at 'b'.]))
 (;W[qb]
 ;B[rb]
 ;W[oe]
 ;B[pg]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[of]
 ;B[qh])))
 (;W[pg]LB[od:a][pe:b]C[The choice between the low and high two-space counter pincer makes a big difference in later play.
 Black can answer at 'a' or 'b'.]
 (;B[od]LB[nd:b][pd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]
 ;B[pe]
 ;W[pc]LB[qc:a][oe:c][re:b]C[Black continues with 'a' or 'b'. Black 'a' is unique with the high pincer (compared to the low, where Black must play 'b'). Black 'c' keeps the position simple at a cost.]
 (;B[qc]LB[qb:a][oe:b]C[White continues with 'a'. White 'b' is an old pattern.]
 (;W[qb]LB[rb:b][qf:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[qf]LB[rb:A][mc:B]C['a' or 'b'.]
 (;W[rb]
 ;B[nd]
 ;W[nb]
 ;B[rh]C[
 * Joseki *])
 (;W[mc]
 ;B[nd]
 ;W[md]
 ;B[me]
 ;W[nc]
 ;B[le]
 ;W[rb]
 ;B[rh]))
 (;B[rb]C[Black 11 is a mistake.]
 ;W[qe]
 ;B[oe]
 ;W[pb]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[qh]
 ;W[qg]
 ;B[ra]LB[mc:B][md:A]C[Black lives. Now White must settle his stones at top.]
 (;W[md]
 ;B[me]
 ;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[nb]
 ;B[la]
 ;W[mb]
 ;B[le]
 ;W[jc]
 ;B[kc]
 ;W[nf]
 ;B[ne]C[White gets a slightly better result.])
 (;W[mc]LB[lc:a][md:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[lc]
 ;W[md]
 ;B[me]
 ;W[lb]
 ;B[kb]
 ;W[nb]
 ;B[la]
 ;W[mb]
 ;B[le]
 ;W[jc]
 ;B[kc]
 ;W[nf]
 ;B[ne])
 (;B[md]C[Black 23 looks better than it is.]
 ;W[lb]))))
 (;W[oe]
 ;B[pf]
 ;W[nd]
 ;B[of]LB[me:b][nf:a]C[White continues with 'a' or 'b'. White 'b' tries to avoid giving Black such great shape on the right side.]
 (;W[nf]
 ;B[og]C[This pattern is considered to favor Black.])
 (;W[me]
 ;B[qg])))
 (;B[re]LB[md:a][nd:b]C[White continues with 'a' or 'b'.]
 (;W[md]
 ;B[le]LB[lc:a][oe:b]C[White continues with 'a'. White 'b' is a mistake, failing to account for the high White pincer at 4.]
 (;W[lc]
 ;B[kc]
 ;W[mc]
 ;B[jd])
 (;W[oe]
 ;B[of]
 ;W[ne]
 ;B[pf]))
 (;W[nd]C[White 10 is an exception - usually this atari is a mistake.]
 ;B[oe]
 ;W[md]LB[le:a][me:b]C[Black continues with 'a' or 'b'.]
 (;B[le]LB[mf:a][nf:b]C[White continues with 'a' or 'b'.]
 (;W[mf]
 ;B[me]
 ;W[ne]
 ;B[nf]LB[lc:a][mg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[lc]
 ;B[kc]
 ;W[mb]
 ;B[jd]LB[lb:a]C[It is better not to give atari at 'a'.])
 (;W[mg]C[White 18 is a mistake, as it is not sente.]
 ;B[lc]LB[nc:b][of:a]C[If White 'a', Black 'c'. The result is terrible for White.]
 ;W[mb]C[White must play 20.]
 ;B[og]
 ;W[lb]
 ;B[kb]
 ;W[rb]
 ;B[ph]))
 (;W[nf]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[lc]
 ;B[lf]
 ;W[ng]
 ;B[qc]
 ;W[mb]))
 (;B[me]LB[lc:b][ne:a]C[White continues with 'a' or 'b'.]
 (;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[le]
 ;W[lc]
 ;B[kc]
 ;W[mb]
 ;B[jd])
 (;W[lc]
 ;B[ne]
 ;W[kd]
 ;B[le]
 ;W[jc]LB[qb:b][qc:a]C[If Black plays 'a', White replies 'b' and connects.]))))
 (;B[oe]
 ;W[qe]LB[qc:B][qf:A]
 (;B[qf]
 ;W[re]
 ;B[qg]
 ;W[rd]
 ;B[ph])
 (;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pb]LB[pb:14][qb:12][rb:13][qc:11][oe:9][qe:10]C[Same position as Black 11, White 12, Black 13, White 14 played before Black 9, White 10, see there for continuation.])))
 (;W[nd]C[White 6 is pointless with the high pincer.]
 ;B[oe]
 ;W[pc]LB[qc:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]LB[qc:a][pd:b]C[White may try 'a' or 'b'. With White 6, the damage is already done.]
 (;W[qc]
 ;B[qf]
 ;W[qg]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[kc]
 ;B[lc]
 ;W[dp]C[White plays elsewhere.]
 ;B[rg]
 ;W[rh]
 ;B[rc]
 ;W[rb]
 ;B[re]
 ;W[sc]LB[qh:a][qi:b]C[White 26 is absolutely necessary. If the ladder is favorable, Black cuts at 'a', otherwise can peep at 'b'.])
 (;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[rf]
 ;W[rg]
 ;B[qh]
 ;W[qg]
 ;B[ra]LB[md:a]C[This sequence so far is forced. Clearly White 6 would be better placed at 'a'. White has no good way to settle the top group of stones.]
 ;W[lb]
 ;B[kb]
 ;W[kc]
 ;B[lc]
 ;W[jb]
 ;B[mb]
 ;W[ka]
 ;B[nc]C[The White stones are captured; the continuation shows Black's vain attempt to save them.]
 ;W[nb]
 ;B[mc]
 ;W[ma]
 ;B[pa]LB[na:a][ob:b]C['a' and 'b' are miai; the White stones are history.]))
 (;B[qc]
 ;W[ne]
 ;B[qf]LB[nc:b][nf:a]C[Black 11 is a possible continuation. Black later aims at 'a' and the cutting point 'b'.])))
 (;B[pe]LB[nd:b][me:a]C[White continues with 'a'. White 'b' is too slow.]
 (;W[me]LB[nd:b][le:a][og:c]C[White 6 is the tesuji for settling his stones.
 Black continues with 'a'. Black 'b' takes the bait. Black 'c' is not recommended either.]
 (;B[le]
 ;W[mf]
 ;B[pc]
 ;W[lf])
 (;B[nd]C[Black 7 is a mistake.]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[ne]
 ;B[mb]
 ;W[lc]
 ;B[oe]
 ;W[ng]C[In the early game, White's strength exceeds Black's profit.])
 (;B[og]C[Black 7 is not recommended.]
 ;W[oh]
 ;B[of]
 ;W[md]
 ;B[ph]
 ;W[pi]
 ;B[qh]
 ;W[qi]
 ;B[rg]
 ;W[rh]
 ;B[qg]LB[lc:B][nh:A]C['a' or 'b'.]
 (;W[nh]LB[le:b][mf:a]C[Black 'a' is possible, but provoking White 'b' is not good.])
 (;W[lc])))
 (;W[nd]C[White 6 is slow.]
 ;B[of]C[After Black 7, White 6 clearly would be better at the marked
 point.]MA[md]
 ;W[le]
 ;B[ke]
 ;W[me]
 ;B[pc]
 ;W[kd]
 ;B[jd]
 ;W[kc]
 ;B[jc]
 ;W[lb]
 ;B[kb]
 ;W[lc]LB[nd:6][me:10]C[White is overconcentrated and has not done well.
 The shape of the White group is the same of a Black group after a Black mistake after White plays 10 instead of 6.
 ])))
 (;W[]LB[pc:a][od:b]C[White plays elsewhere.
 Black continues with 'a' or 'b'.]
 (;B[pc]LB[od:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[od]
 ;B[pf]LB[me:b][ne:a]C[White continues with 'a' or 'b'.]
 (;W[ne]LB[mf:b][ph:a][qi:c]C[Black continues with 'a' to 'c'.]
 (;B[ph]LB[le:b][mf:a]C[White plays 'a' if a ladder to the lower left is not favorable.
 If White has a favorable ladder to the lower left, White continues with 'b'.]
 (;W[mf]
 ;B[id]C[
 * Joseki *])
 (;W[le]C[White must have the ladder to play this way.]
 ;B[ke]
 ;W[kd]
 ;B[lc]
 ;W[je]
 ;B[kf]
 ;W[lf]
 ;B[jd]
 ;W[kc]LB[mb:b][jc:a]C[Black continues with 'a' if the ladder to capture Black 11, 15 is favorable to Black, or 'b' if the ladder is unfavorable.]
 (;B[jc]C[Black must have the ladder to play this way.]
 ;W[kb]
 ;B[lb]
 ;W[jb]
 ;B[ib]
 ;W[ic]
 ;B[id]
 ;W[ie]
 ;B[hd]
 ;W[kg])
 (;B[mb]
 ;W[jc]
 ;B[ob]
 ;W[lg]C[Black has failed.])))
 (;B[mf]LB[nf:b][og:a]C[White continues with 'a'. White 'b' leaves Black a step ahead.]
 (;W[og]
 ;B[pg]LB[mg:b][oh:a]C[White continues with 'a'. White 'b' can leave White with bad
 shape or a ko.]
 (;W[oh]
 ;B[qi]
 ;W[mg]
 ;B[lg]
 ;W[mh])
 (;W[mg]C[White 11 is not recommended.]
 ;B[lg]LB[nf:b][mh:a]C[White 'a' leads to bad shape, White 'b' to ko.]
 (;W[mh]
 ;B[nf]
 ;W[of]
 ;B[pe]
 ;W[oe]
 ;B[oh]
 ;W[ng]
 ;B[lf])
 (;W[nf]C[White must fight a ko.]
 ;B[mh]
 ;W[nh])))
 (;W[nf]C[White 9 is hopeless.]
 ;B[mg]
 ;W[ng]
 ;B[mh]LB[qe:a][qf:b]C[If now White 'a', Black 'b'.]))
 (;B[qi]C[Black 8 is a bit loose, but playable.]
 ;W[id]
 ;B[lf]
 ;W[ng]))
 (;W[me]
 ;B[le]
 ;W[mg]LB[lf:a][ph:b]C[Black continues with 'a'. Black 'b' lets White settle his stones.]
 (;B[lf]
 ;W[mf]
 ;B[md]
 ;W[of]
 ;B[pe]
 ;W[oe]
 ;B[ph]
 ;W[lg])
 (;B[ph]C[Black 10 is not recommended.]
 ;W[lf])))
 (;W[pe]LB[od:c][pd:a][qe:b]C[Black continues with 'a'. Black 'b' lacks fighting spirit. 'c' is possible, esp. with the ladder.]
 (;B[pd]
 ;W[oe]LB[od:a][qe:b]C[Black continues at 'a' or 'b'.]
 (;B[od]
 ;W[qe]
 ;B[ne]
 ;W[nf]
 ;B[me])
 (;B[qe]LB[od:a][pg:b]C['a' and 'b' are miai.]
 (;W[od]
 ;B[pg])
 (;W[pg]
 ;B[od])))
 (;B[qe]C[Black 6 is a mistake.]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pf])
 (;B[od]
 ;W[pd]
 ;B[qc]
 ;W[nd])))
 (;B[od]LB[pc:a][nd:c][pd:b]C[White can respond with 'a' or 'b'. A favorable ladder is required for 'b'.
 White 'c' is not recommended.]
 (;W[pc]
 ;B[pd]
 ;W[qc]
 ;B[nc]
 ;W[nb]LB[mb:b][mc:a]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[kc]
 ;B[lc])
 (;B[mb]C[Black plays this way to get sente.]
 ;W[mc]
 ;B[nd]
 ;W[lb]LB[lc:a][rc:b]C['a' and 'b' are Black's continuations, but playing this way immediately is a waste (use the other variation if Black doesn't want sente).]))
 (;W[pd]C[White must have the ladder to play this way.]
 ;B[pe]
 ;W[pc]LB[qc:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[qc:a][qe:b]C[White continues with 'a' or 'b'. White plays 'b' to sacrifice
 the three stones for a position on the right side.]
 (;W[qc]
 ;B[re]
 ;W[rb]LB[nc:b][rc:a][rd:c]C[If White plays 12 at 'a', Black 'b' is sente, which is painful.
 Giving atari at 'c' destroys the future potential here.])
 (;W[qe]C[The idea is to sacrifice the three White stones in order to settle on the right.]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[re]
 ;B[pb]
 ;W[rc]
 ;B[qa]
 ;W[rd]
 ;B[qb]
 ;W[pf]
 ;B[oe]
 ;W[qi]))
 (;B[qc]LB[mc:a][qe:b]C[White plays 'a' to save the three stones, or 'b' to sacrifice the three stones for position on the right side.]
 (;W[mc]C[White saves his three stones with 10.]
 ;B[ne]
 ;W[lc]
 ;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[ic]
 ;B[qj]C[Black builds a large framework, but has played two extra moves to do so.])
 (;W[qe]C[White sacrifices his three stones with 10.]
 ;B[oe]
 ;W[qb]
 ;B[rb]
 ;W[re]
 ;B[pb]
 ;W[rc]
 ;B[qa]
 ;W[rd]
 ;B[qb]
 ;W[qh]
 ;B[nc])))
 (;W[nd]C[White 6 leads to bad shape.]
 ;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[ne]
 ;B[nf]LB[me:a][mf:b]C[White must play 'a'. White 'b' is unreasonable.]
 (;W[me]
 ;B[of])
 (;W[mf]C[White 11 is unreasonable.]
 ;B[me]LB[nc:a][of:b]C[White can only play 'a'. White 'b' doesn't work.]
 (;W[nc]
 ;B[of]
 ;W[lc]
 ;B[lf]
 ;W[kc]
 ;B[mg]C[Black's outward strength is winning.])
 (;W[of]C[White 13 is reckless.]
 ;B[ng]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[qg]
 ;W[re]
 ;B[sd]C[Black 27 is the tesuji to save the stones, along with 29.]
 ;W[rg]
 ;B[sf]LB[rf:a][rh:b]C['a' and 'b' are miai.]
 (;W[rf]
 ;B[rh])
 (;W[rh]
 ;B[rf]))))))
 (;W[lb]LB[jc:b][nd:a]C[White 4 indicates a special strategy.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nd]
 ;W[od]
 ;B[oe]LB[nc:a][pe:b]C[White continues with 'a'. White 'b' is not recommended, as White cannot get outside.]
 (;W[nc]
 ;B[pe]
 ;W[nf])
 (;W[pe]C[White 8 is not recommended, as White makes no progress getting outside.]
 ;B[pd]
 ;W[ne]
 ;B[of]
 ;W[md]
 ;B[me]
 ;W[nc]
 ;B[nf]))
 (;B[jc]C[Black 5 is loose, allowing White ready access to the center.]
 ;W[oe]
 ;B[pf]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[pd]
 ;W[od]))
 (;W[ne]LB[pe:a][pf:b]C[White 4 is not recommended.
 Black replies with 'a'. Black 'b' is loose.]
 (;B[pe]LB[qb:b][oe:a]C[Black 5 aims to cut.
 White must play 'a' to ensure connection. White 'b' is a mistake.]
 (;W[oe]C[White must ensure connection by playing 6, showing White 4 as slow.]
 ;B[pg])
 (;W[qb]C[White 6 is a mistake.]
 ;B[nd]
 ;W[od]
 ;B[oe]
 ;W[md]
 ;B[me]
 ;W[nc]
 ;B[nf]C[Black has wonderful thickness.]))
 (;B[pf]C[Black 5 gives away too much.]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]))
 (;W[lc]C[Don't play this moce.]
 ;B[mc]
 ;W[md]
 ;B[nd]
 ;W[me]
 ;B[nc]LB[kd:A][pd:B]C['a' is necessary, activating the separated White stone on 'b' is maling things worse.]
 (;W[kd]
 ;B[ne]
 ;W[le])
 (;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[od]
 ;W[pc]
 ;B[qe]LB[rc:A][kd:B]C[White lives in the corner on 'a' or dies after 'b'. Both results are a disaster.]
 (;W[rc]
 ;B[kd])
 (;W[kd]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[pa]
 ;W[ob]
 ;B[nb]
 ;W[oa]
 ;B[qb])))
 (;W[jc]LB[od:B][pe:A]C['a' or 'b'.]
 (;B[pe]
 ;W[nd]
 ;B[ke]
 ;W[lb])
 (;B[od]
 ;W[nd]
 ;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[ne])))
 (;B[kd]LB[qb:g][mc:i][qc:a][pd:b][pe:c][of:d][pf:e][pg:f][dp:h]C[
 -Space High Pincer = Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia
 -----------------------------------------------------------------------------
 The three-space high pincer is relatively recent (since the 1950s).
 It is not often played, and not many definitive sequences have been worked out.
 The balance with the top-left corner is usually the main factor in choosing this pincer.
 White responds from 'a', 'b', 'c', 'd', 'e', 'f' to 'i', and may play elsewhere 'h'.
 White 'i' aims to fight.
 i9, h8, g7, f6, e5, d4, c3, b2, a1
+]
 (;W[qc]C[White aim to settle quickly.]
 ;B[rc]LB[rb:b][pd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pd]LB[qb:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qb]
 ;B[pg]C[
 * Joseki *])
 (;B[qb]
 ;W[qe]
 ;B[pc]
 ;W[rd]
 ;B[qc]
 ;W[oe]
 ;B[ob]
 ;W[nc]
 ;B[mb]))
 (;W[rb]LB[qb:c][pc:a][rd:b]C[White 6 is slow.
 Black continues with 'a'. Black 'b' is mild. Black 'c' is also
 a mistake.]
 (;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[pb]
 ;B[od]
 ;W[nc]
 ;B[nd]C[Black creates a powerful wall.])
 (;B[rd]
 ;W[pb])
 (;B[qb]
 ;W[pc]
 ;B[sb]
 ;W[rd]
 ;B[ra]
 ;W[qe]C[This works even if the ladder does not favor White.]
 ;B[pd]
 ;W[oe]C[White 14 lets White squeeze Black if there is an unfavorable
 ladder.])))
 (;W[pd]LB[qc:b][qe:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[pg]C[
 * Joseki *])
 (;B[qc]C[Black 5 is a mistake.]
 ;W[qe]LB[pe:c][re:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake. 'c' is possible.]
 (;B[re]LB[qf:b][rf:a]C[White continues with 'a' to take the corner, or 'b' to force Black along to crawl along the second line (the 'line of defeat').]
 (;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc]C[White takes the corner.])
 (;W[qf]
 ;B[rf]
 ;W[qg]))
 (;B[qf]LB[pe:a][re:b]C[Black 7 is a mistake.
 White continues with 'a'. White 'b' fails to take advantage of Black's mistake.]
 (;W[pe]
 ;B[re]
 ;W[rf]LB[rd:b][rg:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[rc])
 (;B[rd]C[Black 11 is slow.]
 ;W[qg]
 ;B[rb]
 ;W[pf]C[White 14 leaves no bad aji.]))
 (;W[re]C[With White 8, White loses an opportunity to take advantage.]
 ;B[pe]
 ;W[rf]
 ;B[oe]
 ;W[pc]
 ;B[qb]
 ;W[rd]
 ;B[nc]))
 (;B[pe]
 ;W[re]
 ;B[oe]
 ;W[pc]
 ;B[qb]
 ;W[rd]
 ;B[nc])))
 (;W[pe]LB[pd:b][qe:a]C[White 4 is a bit risky, though nothing happens if Black plays 'a' rather than the cut following 'b'.
 Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[id]LB[ne:a]C[
 * Joseki *
 Black may continue with 'a'.])
 (;B[pd]C[Black plays tough, planning to cut.]
 ;W[od]
 ;B[oe]
 ;W[pf]LB[ne:b][of:a]C[White 8 is the only move.
 Black continues with 'a'. Black 'b' is too mild.]
 (;B[of]
 ;W[pg]
 ;B[og]
 ;W[ph]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[ob]
 ;B[rc]
 ;W[re]
 ;B[rd]LB[lc:b][md:c][ne:a]C[White continues with 'a'.
 White 'b' and 'c' are not recommended, as Black gets superior thickness. White 'c' is better than 'b', but not by much.]
 (;W[ne]C[White 20 is the strongest continuation.]
 ;B[oh]
 ;W[oi]LB[lg:B][mh:A]
 (;B[mh]
 ;W[le]
 ;B[ld]
 ;W[md]
 ;B[mf]
 ;W[me]
 ;B[pi]LB[qi:a][pj:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[qi]
 ;B[pj]
 ;W[qj]
 ;B[pk])
 (;W[pj]C[White 30 is a mistake. The five White stones on the right will
 be captured.]
 ;B[qi]
 ;W[qj]
 ;B[rh]LB[rg:b][rj:a]C[Black 33 is the tesuji. White 'a' is the best White can do, but not good enough. If White 'b', Black 'a'.]
 ;W[rj]
 ;B[rg]
 ;W[rf]
 ;B[qe]
 ;W[qf]
 ;B[sg]
 ;W[sf]
 ;B[ri]))
 (;B[lg]))
 (;W[lc]C[White 20 is not recommended.]
 ;B[oh]
 ;W[pi]
 ;B[ld]
 ;W[kc]
 ;B[jc]
 ;W[jb]
 ;B[ib]C[To live, White gives Black considerable thickness.])
 (;W[md]C[White 20 is not very good.]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kb]
 ;B[kc]
 ;W[lb]
 ;B[ic]
 ;W[jb]
 ;B[ie]))
 (;B[ne]C[Black 9 is too mild.]
 ;W[qb]
 ;B[rf]C[White can settle himself. The three-space pincer is too far to be a weapon. White has an easy fight.]
 ;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rg]
 ;W[qi]
 ;B[rc]
 ;W[mc]
 ;B[rh]
 ;W[oi]
 ;B[og]
 ;W[qh]
 ;B[le]
 ;W[kb])))
 (;W[of]LB[oe:b][qg:a]C[White 4 is natural. Variations are the same as other pincers.
 Black continues with 'a' or 'b'.]
 (;B[qg]LB[id:a][ph:b]C[White continues with 'a' or 'b'.]
 (;W[id]C[
 * Joseki *]
 ;B[kf]
 ;W[oh]
 ;B[pi]
 ;W[pe]
 ;B[qe]
 ;W[kh]
 ;B[ie]
 ;W[hd]
 ;B[jd]
 ;W[he]
 ;B[ig])
 (;W[ph]LB[pg:B][qh:A]C[Black may play joseki on 'a'. 'b' is a mistake,]
 (;B[qh]
 ;W[pi]
 ;B[qi]
 ;W[pj]
 ;B[qk]
 ;W[pe]
 ;B[qe]
 ;W[id]C[
 * Joseki *])
 (;B[pg]
 ;W[og]
 ;B[oh]
 ;W[pj]
 ;B[nh]
 ;W[qh]
 ;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[mf]TR[kd]C[The marked stone is now isolated.])))
 (;B[oe]
 ;W[ne]
 ;B[pe]LB[mc:b][nd:a]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[nf]LB[ld:b][og:a]C[White must now decide what to do about White 4, the cut stone.
 White 'a' is the better option. White 'b', the sacrifice, is not recommended.]
 (;W[og]
 ;B[ng]
 ;W[oh]
 ;B[lf]
 ;W[qb]
 ;B[qg])
 (;W[ld]C[White 10 is not recommended.]
 ;B[og]
 ;W[mf]
 ;B[ng]
 ;W[kc]LB[kd:3][ld:10]C[White's position is tenuous, compared to the result of the similar joseki after the pincer Black 3 being one line closer on 100, where 3 is captured not just made heavy.]))
 (;W[mc]C[White 8 avoids fighting.]
 ;B[nf]
 ;W[me]
 ;B[og]
 ;W[mf]
 ;B[ng]LB[hd:a]C[
 * Joseki *
 White may continue with 'a'.])))
 (;W[pf]LB[od:a][pe:b]C[White adopts the taisha. Black can play 'a' or 'b'.]
 (;B[od]
 ;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[qe]
 ;W[oe]
 ;B[nd]
 ;W[qc]LB[re:b][qf:a]C[Black continues with 'a'. Black 'b' was recently played by Nie 9-dan, who reportedly liked the result he got.]
 (;B[qf]
 ;W[of]
 ;B[qh]
 ;W[mb])
 (;B[re]C[The game setup where this variation occurred is shown for reference. The colors are reversed from the actual game.]
 ;W[rc]
 ;B[of]
 ;W[ne]
 ;B[md]
 ;W[og]
 ;B[nf]
 ;W[me]
 ;B[le]
 ;W[mf]
 ;B[ng]
 ;W[nh]
 ;B[mg]
 ;W[lf]
 ;B[pg]
 ;W[kf]
 ;B[nb]
 ;W[ob]
 ;B[id]
 ;W[lh]
 ;B[oh]
 ;W[gc]))
 (;B[pe]
 ;W[oe]
 ;B[qf]LB[pg:a][qg:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[pg]
 ;B[qg]
 ;W[ph]LB[qh:a][qi:b]C[Black continues with 'a'. A Black jump to 'c' is premature.]
 (;B[qh]
 ;W[pi]
 ;B[qj]
 ;W[id]C[
 * Joseki *])
 (;B[qi]C[Black 11 is a mistake.]
 ;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pc]LB[sb:b][rd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rd])
 (;B[sb]C[Black 19 is a mistake.]
 ;W[qh]
 ;B[rh]LB[rg:a][ri:b]C[Depending upon the ladder, White can play 'a', threatening to capture Black 11, or 'b', aiming for Black 15 or the five Black stones.])))
 (;W[qg]LB[od:a][pg:b]C[White 8 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[od]LB[nd:a][of:b]C[White may try 'a' or 'b'. Either results in a loss.]
 (;W[nd]
 ;B[of]
 ;W[pd]
 ;B[pg])
 (;W[of]
 ;B[nd]))
 (;B[pg]C[White 9 is a mistake.]
 ;W[of]
 ;B[qh]
 ;W[rg]
 ;B[ph]
 ;W[qc]
 ;B[rf]
 ;W[rd]))))
 (;W[pg]C[The large taisha.]
 ;B[od]LB[nd:a][pd:b]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[oe]
 ;W[pc]LB[qc:b][ne:a]C[Black continues with 'a'. Black 'b' is not recomended.]
 (;B[ne]
 ;W[md]
 ;B[me]LB[qc:a][pd:b]C[White continues with 'a' or 'b'.]
 (;W[qc]LB[mb:a][ld:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mb]LB[nb:a][lc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nb]
 ;B[ld]C[
 * Joseki *]
 ;W[pj])
 (;W[lc]C[White 14 is a mistake.]
 ;B[kc]
 ;W[lb]
 ;B[kb]
 ;W[la]
 ;B[ld]
 ;W[mc]))
 (;B[ld]C[Black 13 is a mistake.]
 ;W[mb]))
 (;W[pd]
 ;B[pe]
 ;W[qe]LB[re:a][qf:b]C[Black continues with 'a'. Black 'b' keeps the situation simple, but gives White superior profit.]
 (;B[re]
 ;W[qf]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[rf]
 ;W[rg]
 ;B[qh]
 ;W[qg]
 ;B[ra]
 ;W[mb]LB[kb:a][oi:b][pk:c]C[Black continues with 'a' through 'c', depending on the overall situation.])
 (;B[qf]C[Black 15 is not recommended.]
 ;W[re]
 ;B[qg]
 ;W[rd]
 ;B[ph])))
 (;B[qc]LB[mc:a][le:b]C[Black 9 is not recommended. White is conservative, and Black gets the better of it. White 'b' is a light, flexible reply that Black will have trouble answering.]
 (;W[mc]
 ;B[og]
 ;W[oh]
 ;B[ng])
 (;W[le])))
 (;W[pd]
 ;B[pe]
 ;W[pc]LB[qc:b][nd:a]C[Black continues with 'a' or 'b'. 'a' is simple but a bit mild, while 'b' is complicated.]
 (;B[nd]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd]
 ;B[og])
 (;B[qc]LB[mc:a][oe:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mc]
 ;B[oe]
 ;W[qb]
 ;B[rb]
 ;W[me]
 ;B[og]
 ;W[oh]
 ;B[ng]LB[qe:b][lf:a]C[White 'a' and 'b' are possible continuations. White 'a' is simple, White 'b' a strong move.]
 (;W[lf]
 ;B[ph]
 ;W[pi]
 ;B[qh]
 ;W[qi]
 ;B[rg]
 ;W[rh]
 ;B[qg])
 (;W[qe]
 ;B[pb]
 ;W[ob]
 ;B[qf]
 ;W[re]
 ;B[qa]
 ;W[qg]LB[lf:a][rf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[lf]C[What should follow is not altogether clear.])
 (;B[rf]C[Black 25 is a mistake.]
 ;W[pf]
 ;B[rd]
 ;W[of]
 ;B[nf]
 ;W[ne]
 ;B[se]
 ;W[pi]C[White looks forward to profitably tormenting the three Black stones.])))
 (;W[oe]C[White 10 is an old 2-space pincer joseki that is no longer considered favorably.]
 ;B[pf]LB[nd:a][of:b]C[White continues with 'a'. White 'b' is reckless.]
 (;W[nd]
 ;B[of]
 ;W[me]
 ;B[qg])
 (;W[of]C[White 12 is a mistake.]
 ;B[nd]
 ;W[qb]
 ;B[rf]LB[rb:a][og:b]C['a' and 'b' are miai.])))))
 (;W[qb]
 ;B[pf]
 ;W[mc]
 ;B[qj])
 (;W[]C[White plays elsewhere.]
 ;B[pc]
 ;W[od]
 ;B[pf]
 ;W[md]
 ;B[ph]C[
 * Joseki *])
 (;W[mc]LB[pc:A][nd:B]C['a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[ob]
 ;W[pd]
 ;B[nc]
 ;W[od]
 ;B[qb]
 ;W[nb]
 ;B[nd]
 ;W[oa]
 ;B[pb]
 ;W[ne]
 ;B[md]
 ;W[ld]
 ;B[me]
 ;W[le]
 ;B[mf]
 ;W[lb]
 ;B[og]
 ;W[qh]LB[pg:A]C[Black 'a' doesn't work.]
 ;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[rg]LB[rf:A][rh:B]C['a' or 'b' don't help,]
 (;B[rf]
 ;W[re]
 ;B[rh]
 ;W[sf]
 ;B[qi]
 ;W[rc])
 (;B[rh]
 ;W[re]
 ;B[rd]
 ;W[ri]))
 (;B[nd]LB[nc:A][md:C][od:B]C['a' is the correct punishment. 'b' is disadvantageous. 'c' is nonsense.]
 (;W[nc]LB[md:B][od:A][oe:C]C['a', 'b' or 'c'.]
 (;B[od]
 ;W[pd]LB[pc:B][pe:A]C['a' or 'b' don't work.]
 (;B[pe]
 ;W[pc]
 ;B[md]
 ;W[ld]LB[lc:A][le:B]C['a' or 'b' don't work.]
 (;B[lc]
 ;W[le]
 ;B[kc]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[nf]
 ;W[og]LB[qe:A][ng:B]C['a' or 'b' don't work.]
 (;B[qe]
 ;W[mg])
 (;B[ng]
 ;W[qe]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[re]
 ;B[qg]
 ;W[qh]
 ;B[ph]
 ;W[oh]
 ;B[rh]
 ;W[qi]
 ;B[rg]
 ;W[ri]))
 (;B[le]
 ;W[lc]
 ;B[me]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd]))
 (;B[pc]
 ;W[pe]LB[qc:A][md:B]C['a' or 'b' don't work.]
 (;B[qc]
 ;W[me])
 (;B[md]
 ;W[qc]
 ;B[pb]
 ;W[qb])))
 (;B[md]
 ;W[ld]LB[lc:B][le:A]C['a' or 'b' don't work.]
 (;B[le]
 ;W[lc]
 ;B[od]
 ;W[pd])
 (;B[lc]
 ;W[le]
 ;B[od]
 ;W[pd]LB[pc:A][pe:B]C['a' or 'b' don't work.]
 (;B[pc]
 ;W[pe]
 ;B[qc]
 ;W[kc]
 ;B[nf]
 ;W[ne])
 (;B[pe]
 ;W[pc]
 ;B[oe]
 ;W[kc]
 ;B[lb]
 ;W[kb])))
 (;B[oe]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;W[ld]
 ;B[le]
 ;W[kc]
 ;B[ke]
 ;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[re]
 ;W[md]
 ;B[me]LB[ic:A][rc:B]C[Tenuki, 'a' or 'b'.]
 (;W[ic]
 ;B[pl])
 (;W[rc])))
 (;W[od]
 ;B[oe]
 ;W[ne]LB[md:a][pe:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[md]
 ;W[pe]
 ;B[of]
 ;W[pd]
 ;B[pf]
 ;W[qe]
 ;B[lc])
 (;B[pe]
 ;W[me]))
 (;W[md]C[White 6 is a mistake in direction.]
 ;B[me]
 ;W[le]
 ;B[ne]
 ;W[ld]
 ;B[kc]))))
 (;B[od]C[Outdated
 Tsuke
 ------
 Black 3 may be used when Black is strong on the right side.
+]
 ;W[nd]
 ;B[oe]C[
 Tsuke-Nobi (attach-extend)
 ------------------------------
 Black 3 and 5 are the tsukenobi.
+]
 ;W[pc]
 ;B[qc]LB[kc:a][ne:b]C[White continues with 'a' or 'b'.]
 (;W[kc]
 ;B[qj])
 (;W[ne]
 ;B[nf]LB[lc:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[lc]
 ;B[qf])
 (;W[of]
 ;B[qf]
 ;W[og]
 ;B[mf]
 ;W[lc]LB[ld:a][qg:b]C[Black 'a' and White 'b' are the respective tesujis for each side to settle himself.])))
 (;B[nd]LB[nc:D][qc:b][od:a][pd:c]C[
 Kata-tsuki (shoulder hit)
 --------------------------
 Since the Ming era the Joseki is named "dao chui lian", which translates to "drooping lotus".
 Black 3, a straight-forward attempt to build thickness, is generally regarded as a trick play, but White must be careful in answering.
 Black must have the ladder to play this way.
 White continues with 'a'. White 'b' and 'c' are not recommended.
+]
 (;W[od]
 ;B[oe]LB[ne:a][pe:b]C[White 'a' is correct. White 'b' is a mistake, though Black may make his own mistakes after White 'b'.]
 (;W[ne]LB[nc:a][md:c][pe:b]C[White 6 is the only move.
 Black may try 'a' or 'b'. Black 'c' is a mistake.]
 (;B[nc]LB[nb:b][pe:a]C[White continues with 'a' and 'b'.]
 (;W[pe]
 ;B[of]
 ;W[pd]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[me])
 (;W[nb]
 ;B[me]
 ;W[nf]
 ;B[of]LB[mf:a][ng:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mf]
 ;B[mb]
 ;W[pb]
 ;B[na]
 ;W[ob]
 ;B[mc]
 ;W[le]LB[qb:c][jc:a][qc:b]C[Black continues with 'a'. Black 'b' takes the five White stones and the corner, in the process giving White magnificant thickness.
 Black 'c' is also unreasonable.]
 (;B[jc]
 ;W[qc])
 (;B[qc]C[Black 19 is a mistake.]
 ;W[kc]
 ;B[kb]
 ;W[jb]LB[lb:a][jc:b]C[Black continues with 'a'. Black 'b' is a trick play difficult to counter.]
 (;B[lb]
 ;W[ic]
 ;B[qb]
 ;W[og]
 ;B[qf]
 ;W[lc]
 ;B[pd]
 ;W[md]
 ;B[pa])
 (;B[jc]LB[lc:c][kd:b][og:a]C[White continues with 'a'. White 'b' is a ridiculous mistake.
 White 'c' is also a mistake, worse than 'b', though seemingly much less ridiculous.]
 (;W[og]LB[pd:a][pg:b]C[Black continues with 'a' to capture the White stones in the corner.
 Black 'b' fails to unbreak the ladder and is a mistake.]
 (;B[pd]
 ;W[lc]
 ;B[lb]
 ;W[ib]LB[qb:A][ld:B]C['a' is correct, the ladder 'b' is broken.]
 (;B[qb]
 ;W[pg]
 ;B[qf]
 ;W[md]
 ;B[pa]
 ;W[id]C[Black 23 retains some aji, but White has triumphed.])
 (;B[ld]
 ;W[kd]
 ;B[ke]
 ;W[md]
 ;B[jd]
 ;W[ld]
 ;B[lf]
 ;W[me]
 ;B[mg]
 ;W[ng]))
 (;B[pg]C[Black 25 is a mistake, it threatens to unbreak the ladder.]
 ;W[pf]C[But White keeps the ladder broken in sente.]
 ;B[pe]
 ;W[lc]C[So now White is one move ahead in the capturing race.]
 ;B[lb]
 ;W[ib]LB[qb:A][ld:B]C['a' or 'b' fail.]
 (;B[qb]
 ;W[md]LB[ja:B][pa:A]C['a' or 'b' fail.]
 (;B[pa]
 ;W[ka]
 ;B[ma]
 ;W[ja]
 ;B[oa]
 ;W[la]
 ;B[pd]
 ;W[qa])
 (;B[ja]
 ;W[la]))
 (;B[ld]
 ;W[kd]
 ;B[ke]
 ;W[md]
 ;B[jd]
 ;W[ld]
 ;B[lf]
 ;W[me]
 ;B[mg]
 ;W[ng]
 ;B[nh]
 ;W[oh]
 ;B[oi]
 ;W[ph])))
 (;W[kd]C[White 24 is a mistake.]
 ;B[ib]
 ;W[lb]
 ;B[ja]
 ;W[lc]
 ;B[la]
 ;W[md]
 ;B[ma])
 (;W[lc]LB[og:a]C[White 24 is a mistake. White must play 'a' before 24, as it breaks a ladder. This sequence shows why.]
 ;B[lb]
 ;W[ib]
 ;B[ld]
 ;W[kd]
 ;B[ke]
 ;W[md]
 ;B[jd]
 ;W[ld]
 ;B[lf]
 ;W[me]
 ;B[mg]LB[og:a]C[White is captured in a ladder. If White had played 'a' first, the ladder would be broken.])))
 (;B[qb]LB[kc:b][qc:a]C[White 19 is a mistake.
 White continues with 'a'. White 'b', giving up the stones, is
 a mistake.]
 ;W[qc]
 ;B[rc]
 ;W[rb]LB[pd:a]C[White must not play 'a' first, as then Black takes the first ko, not White.]
 ;B[pc]
 ;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[qa]
 ;W[ra]
 ;B[pc]
 ;W[pe]
 ;B[pf]
 ;W[qc]C[Black has no more ko threats.]))
 (;W[ng]C[White 12 is a mistake, too slack for the fight.]
 ;B[pd]
 ;W[pb]
 ;B[lc]
 ;W[rc]
 ;B[rd]
 ;W[mb]
 ;B[ke]
 ;W[rb]
 ;B[og]
 ;W[nh]
 ;B[pi]C[Black makes territory and White is left in an awkward position.])))
 (;B[pe]
 ;W[md]
 ;B[nf]
 ;W[me])
 (;B[md]
 ;W[pe]
 ;B[of]
 ;W[pd]
 ;B[mf]
 ;W[qe]))
 (;W[pe]C[White 6 is bad.]
 ;B[pd]
 ;W[ne]
 ;B[of]
 ;W[md]
 ;B[nf]LB[nc:b][me:a]C[White 'a' looks logical, but 'b' is better.]
 (;W[me]
 ;B[ob]LB[nc:a][pc:b]C[Black 13 is the tesuji that makes Black 3 worth trying in the first place.
 White 'a' and 'b' both lead to losses (or should anyway).]
 (;W[nc]C[White 14 is honte (the right move).]
 ;B[pb])
 (;W[pc]
 ;B[nc]LB[nb:a][pb:b][qc:c]C[White 'a' looks promising, but 'b' is better. White 'c' is another opportunity for Black mistakes.]
 (;W[nb]
 ;B[mc]
 ;W[pb]
 ;B[lc]
 ;W[qe]
 ;B[rd]
 ;W[re]
 ;B[qb]
 ;W[oa]
 ;B[rb]LB[ma:a][qg:b]C['a' and 'b' are miai, and White is trapped.])
 (;W[pb]
 ;B[nb]LB[qc:a][rc:b]C[White 'a' is a mistake. White 'b' is better, though the outcome favors Black.]
 (;W[qc]LB[rc:a][rd:b]C[White 18 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]
 ;W[rd]
 ;B[qe]
 ;W[rb]
 ;B[lc]
 ;W[pf]
 ;B[re]
 ;W[pg]
 ;B[sd]
 ;W[mg]
 ;B[pa]
 ;W[qb]
 ;B[sb]C[Black wins.])
 (;B[rd]C[Black 19 is a mistake.]
 ;W[mc]
 ;B[rc]
 ;W[pa]
 ;B[qa]
 ;W[rb]C[White wins.]))
 (;W[rc]C[White 18 is the correct move.]
 ;B[rd]
 ;W[qc]
 ;B[lc]
 ;W[pf]
 ;B[pg]
 ;W[re]
 ;B[qg]
 ;W[rf]
 ;B[nh]))
 (;W[qc]LB[rc:a][rd:b]C[Black continues with the unlikely move 'a'.
 The extension of Black 'b' looks correct, but is a mistake.]
 (;B[rc]C[Black 17 is better than it looks.]
 ;W[rd]
 ;B[qe]
 ;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[pb]
 ;W[rc]
 ;B[re]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[qa]
 ;B[lf])
 (;B[rd]C[Though not obviously so, Black 17 is a mistake.]
 ;W[mc]
 ;B[nb]
 ;W[pb]
 ;B[rc]
 ;W[pa]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[mb]))))
 (;W[nc]C[White 12 is the correct move.]
 ;B[le]
 ;W[kd]
 ;B[qg])))
 (;W[qc]C[White 4 lacks fighting spirit.]
 ;B[od]LB[pd:b][rd:a]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[pc]
 ;W[pb]
 ;B[pd]
 ;W[rb]
 ;B[re]
 ;W[nc]
 ;B[md])
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[re]))
 (;W[pd]C[White 4 helps Black build thickness.]
 ;B[pe]
 ;W[qc]
 ;B[re]
 ;W[nc]
 ;B[md])
 (;W[nc]C[White 4 is passive.]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[kc]
 ;B[pe]))
 (;B[pc]LB[nd:B][od:A]C[Black 3 makes sense in the context of having Black support at top as shown or nearby.
 Kitani Minoru was fond of Black 3.
 'a' is usual, 'b' is possible.]
 (;W[od]LB[pe:B][pf:A]C[Black continues with 'a'. To avoid cutting possibilities, 'b' is ok.]
 (;B[pf]C[Black 5 is thinner than the kosumi, leaving Black more subject
 to later cutting.]
 ;W[le])
 (;B[pe]
 ;W[le]C[Depending upon the exact location of the top side Black stone,
 other White continuations are possible.]))
 (;W[nd]LB[oe:B][pf:A]C['a' is usual, 'b' depends on the ladder.]
 (;B[pf])
 (;B[oe]
 ;W[pb]
 ;B[qb]
 ;W[pd]
 ;B[qc]
 ;W[pe]
 ;B[od]
 ;W[of])))
 (;B[oe]LB[qc:a][md:b]C[
 High Knight's Move = Takageima = Nop'danarincha = Gao Fei
 ----------------------------------------------------------
 Black 3 is a trick play. White continues with 'a' or 'b'.]
 (;W[qc]LB[rc:b][pd:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pd]
 ;W[pc]
 ;B[me]
 ;W[lc])
 (;B[rc]C[Black 5 is an overplay.]
 ;W[pd]
 ;B[pe]
 ;W[rd]
 ;B[qe]
 ;W[rb]))
 (;W[md]C[White 4 is not recommended.]
 ;B[pc]
 ;W[od]
 ;B[pd]
 ;W[ne]C[The result is equal]))
 (;B[]C[
 Tenuki
 -------
 Black need not answer immediately. The continuation is shown as Mokuhazushi-Komoku.
 ]))
 (;W[nc]LB[jc:i][kc:f][lc:c][pc:a][jd:h][kd:d][ld:g][od:b][dp:e]C[
 Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~ = 2-Space Low Approach
 -----------------------------------------------------------------------
 White 2 is used with friendly forces backing it up. Its purpose is to prevent a pincer. Locally it results in a loss, but may be appropriate fuseki strategy.
 It was popular in the late 1950s and early 1960s, but is not seen often nowadays, having been replaced by the one-space high approach, with which it has points in common.
 Black responses range from 'a', 'b', 'c' or 'd'. Black may also play elsewhere 'e'.
 'f' is smilar to 'd'
 'g', 'h' and 'i' are inferior.
 elsewhere e5, d4, c3, b2, a1
+]
 (;B[pc]LB[kc:a][jd:b]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
 White continues with 'a'. The wisdom of White 'b' depends on the left corner.
+]
 (;W[kc]LB[ic:a][qg:b]C[
 * Joseki *
 Here is an example where White may try this approach.
 Black continues with 'a'. Black 'b' lacks direction.]
 (;B[ic]LB[ne:c][pe:a][qf:b]C[White has erased some of Black's left-side enclosure influence, but Black 5 is a good follow-up to White 4.
 White may continue with 'a' to build a center position, or 'b' to emphasize the right side. 'c' appears in the Kobayashi Fuseki.
+]
 (;W[pe]C[kake (press-down)]
 ;B[qe]
 ;W[pg]
 ;B[qf]
 ;W[ng]
 ;B[qh])
 (;W[qf]
 ;B[oe]
 ;W[qi])
 (;W[ne]
 ;B[md]LB[mc:B][nd:A]C['a' or 'b'.
+]
 (;W[nd]
 ;B[pf]
 ;W[ke])
 (;W[mc]
 ;B[nd]
 ;W[od]
 ;B[oc]
 ;W[le]
 ;B[ld]
 ;W[kd]
 ;B[oe]
 ;W[me]
 ;B[pd]
 ;W[lc]
 ;B[od]
 ;W[jf])))
 (;B[qg]C[Black 5 is a mistake.]
 ;W[hc]C[Now White has excellent position.]))
 (;W[jd]C[In this case, White 4 is a mistake.]
 ;B[hc]LB[jb:B][ne:A][dp:C]C[Now White must defend at 'a' or 'b'. 'c' shows what happens if White plays elsewhere.]
 (;W[ne]
 ;B[qg]
 ;W[jb])
 (;W[jb]C[White 6 is necessary])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[ld]
 ;W[lc]
 ;B[kc]
 ;W[kd]
 ;B[jc]C[White is split by the invasion.])))
 (;B[od]LB[pb:b][nd:a]C[
 Kata-tsuki (shoulder-hit)
 --------------------------
 White can respond with 'a' or 'b'.
+]
 (;W[nd]LB[oc:a][ne:b][oe:c]C[Usually bad for White
 Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[oc]
 ;W[ne]LB[id:b][jd:a]C[
 * Joseki *
 Black continues around 'a' or 'b' to erase White thickness.]
 ;B[jd]
 ;W[oe]
 ;B[qf]
 ;W[oh]
 ;B[pg]
 ;W[og]
 ;B[pj])
 (;B[ne]LB[pb:c][oc:b][me:a]C[Best punishment
 White continues with 'a'. White 'b' is not recommended, as it only strengthens Black. White 'c', also not recommended, presents a contradiction.]
 (;W[me]
 ;B[oc]
 ;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[oe]
 ;W[mf]C[
 * Joseki *
 The corner is safe, as one can see from the continuation.]
 ;B[]C[Black plays elsewhere. As a continuation, White tries an invasion.]
 ;W[qb]C[White invades.]
 ;B[pa]
 ;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[re]
 ;W[qe]
 ;B[qf]
 ;W[pd]
 ;B[pe]C[White cannot live.])
 (;W[oc]C[White 6 is not recommended.]
 ;B[pc]
 ;W[oe]
 ;B[pd]LB[me:a][of:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[me]
 ;B[nf]
 ;W[ld]LB[of:a][mg:b]C[Black can continue at 'a', 'b', or play elsewhere.])
 (;W[of]C[White 10 is risky.]
 ;B[me]
 ;W[kc]
 ;B[qg]
 ;W[ng]
 ;B[lf]LB[ic:a][lc:b]C[Black is secure, while White is vulnerable to attacks at 'a' at 'b'.]))
 (;W[pb]C[White's orientation toward influence with 4 contrasts with the territory orientation of 6.]
 ;B[me]
 ;W[qc]
 ;B[rd]
 ;W[lc]))
 (;B[oe]C[Black 5 is slack.]
 ;W[pb]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le]))
 (;W[pb]LB[ob:D][lc:B][ld:A][nd:C]C[Black continues with 'a' if an extension on the right side is far from the two Black stones or 'c' if it's near. 'c' is pushing from behind and amateur style. 'd' is a trick play.]
 (;B[ld]C[Black 5 is a powerful play.]
 ;W[nd]LB[oc:A][ne:B]C['a' is modern. 'b' leads to a big lump.]
 (;B[oc]
 ;W[ob]LB[mb:B][qc:A]C['a' and 'b' are both possible.]
 (;B[qc]LB[mb:A][nf:B]C['a' is ok. 'b' is questionable.]
 (;W[mb]
 ;B[ne]
 ;W[kc])
 (;W[nf]
 ;B[mb]
 ;W[nb]
 ;B[pg]
 ;W[lg]
 ;B[lf]
 ;W[mf]
 ;B[kf]
 ;W[kg]
 ;B[jf]
 ;W[jg]
 ;B[hf]
 ;W[ig]
 ;B[ge]))
 (;B[mb]LB[qc:A][oe:B]C['a' is correct, 'b' is disadvantageous.]
 (;W[qc]
 ;B[nb]LB[rd:A][qe:B]C['a' takes sente, 'b' more territory.]
 (;W[rd]
 ;B[ne])
 (;W[qe]
 ;B[ne]
 ;W[pd]
 ;B[oe]
 ;W[qg]))
 (;W[oe]
 ;B[qc]
 ;W[nb]
 ;B[ne]
 ;W[lc]
 ;B[me]
 ;W[kc]
 ;B[of])))
 (;B[ne]LB[me:a][oe:b]C[White continues with 'a'. White 'b' is usually good style, but
 not here.]
 (;W[me]
 ;B[md]
 ;W[oe]
 ;B[nf]
 ;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[of]
 ;W[qe]
 ;B[od]
 ;W[rd]
 ;B[pc]
 ;W[qc]
 ;B[pd]
 ;W[pf]
 ;B[oe]
 ;W[rb]
 ;B[qf]
 ;W[re]
 ;B[pg])
 (;W[oe]LB[me:a][of:b]C[White 8 is a mistake.
 Black continues with 'a' or 'b'.]
 (;B[me]LB[pd:a][of:b]C[White 'a' and 'b' are not recommended. White lacks a good continuation.]
 (;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[of]LB[qe:a]C[The ko is too big for White to cut at 'a', so White is at a loss.])
 (;W[of]
 ;B[pd]))
 (;B[of]
 ;W[pe]
 ;B[pd]))))
 (;B[lc]LB[qc:B][nd:A]C[White must choose between two evils:
 'a' goes out, but lacks a safe base.
 'b' takes territory, but gets bad shape or is totally enclosed by Black.
+]
 (;W[nd]LB[lc:5][oc:B][qc:A][ne:C]C['a' is the modern joseki using the pincer Black 5 to atack White,
 'b' an older one giving away Black 5.
 'c' is inferior.
+]
 (;B[qc]
 ;W[ld]C[The given continuation is only one of many possibilities.
+]
 ;B[kd]LB[kc:B][ke:C][le:A]C['a' is joseki. 'b' or 'c' are maybe inferior.
+]
 (;W[le]
 ;B[jc]
 ;W[of])
 (;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jd]
 ;W[lb]
 ;B[le]
 ;W[md])
 (;W[ke]
 ;B[jd]
 ;W[lf]))
 (;B[oc]
 ;W[ob]
 ;B[qc]LB[mb:A][nf:B]C['a' is recommended, 'b' is possible.
+]
 (;W[mb]
 ;B[ne]
 ;W[ld]
 ;B[me]
 ;W[kd]
 ;B[qj]
 ;W[hd]C[White wants to make a kakari against the top left corner in sente before this move.])
 (;W[nf]
 ;B[mb]
 ;W[nb]
 ;B[pg]
 ;W[ld]LB[jc:A][kd:B]C['a' is usual.
 'b' is good if Black has a position in the top left corner, Black needs the ladder.]
 (;B[jc]
 ;W[je]
 ;B[hd])
 (;B[kd]
 ;W[kc]
 ;B[le]
 ;W[md]
 ;B[jc]
 ;W[kb]
 ;B[jb]
 ;W[jd]
 ;B[ke]
 ;W[lb]
 ;B[id])))
 (;B[ne]
 ;W[me]
 ;B[md]
 ;W[oe]
 ;B[nf]
 ;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[of]
 ;W[qe]
 ;B[od]
 ;W[rd]
 ;B[pc]
 ;W[qc]
 ;B[pd]
 ;W[pf]
 ;B[oe]
 ;W[rb]
 ;B[qf]
 ;W[re]
 ;B[pg]
 ;W[le]))
 (;W[qc]LB[pc:D][nd:C][pd:A][rd:B]C['a' and 'b' let White go out in bad shape.
 'c' encloses White totally, but discards territory on the right side.
 'd' encloses White totally, White chooses the direction of Black's wall.
+]
 (;B[pd]
 ;W[nd]
 ;B[ne]LB[ld:C][md:A][me:B]C['a' is the only move, 'b' and 'c' don't work.
+]
 (;W[md])
 (;W[me]
 ;B[md])
 (;W[ld]
 ;B[ob]
 ;W[oc]
 ;B[pc]
 ;W[qb]
 ;B[md]
 ;W[mc]
 ;B[mb]
 ;W[me]
 ;B[nb]
 ;W[md]
 ;B[kc]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[ra]
 ;W[rb]
 ;B[se]))
 (;B[rd]
 ;W[nd]
 ;B[ne]LB[ld:C][md:A][me:B]C['a' is ok.
 'b' is not recommended.
 'c' is bad.
+]
 (;W[md])
 (;W[me]
 ;B[md]
 ;W[oe]
 ;B[nf]
 ;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[of]
 ;W[le]
 ;B[jc]
 ;W[qe]C[Later, White can get two stones in gote - a small endgame.
+]
 ;B[od]
 ;W[kd]
 ;B[kc]
 ;W[oe]
 ;B[pf]
 ;W[re]
 ;B[rf]
 ;W[rc]
 ;B[qf]
 ;W[sd])
 (;W[ld]
 ;B[oc]LB[nb:B][ob:A]C['a' or 'b' don't give White a good result.
+]
 (;W[ob]
 ;B[md]
 ;W[mc]
 ;B[me]LB[lb:A][kc:B]C[With 'a', White is pressed down.
 With 'b', White lives in the corner, but puts heavy stones without much use on the board.
+]
 (;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc])
 (;W[kc]
 ;B[lb]
 ;W[mb]
 ;B[ma]
 ;W[nb]
 ;B[kb]
 ;W[jc]LB[jb:A][kd:B]C[Black keeps attacking on 'a' or kills with the ladder on 'b'.
+]
 (;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hc]
 ;B[hb]LB[gc:B][rc:A]C[White lives after 'a' leaving his central stones heavy or dies after 'b'.
+]
 (;W[rc]
 ;B[gc])
 (;W[gc]
 ;B[le]
 ;W[kd]
 ;B[rb]
 ;W[gb]
 ;B[qb]
 ;W[ha]
 ;B[pc]
 ;W[ia]
 ;B[pa]
 ;W[ja]
 ;B[oa]))
 (;B[kd]
 ;W[le]
 ;B[jd]
 ;W[jb]
 ;B[lf])))
 (;W[nb]LB[ob:B][md:A]C['a' is correct, 'b' is bad.
+]
 (;B[md]
 ;W[mc]
 ;B[me]
 ;W[kc]
 ;B[lb]
 ;W[kb]
 ;B[ob]
 ;W[oa]
 ;B[ma]
 ;W[na]
 ;B[kd]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[jd]
 ;W[pa]LB[jf:A][kf:B]C['a' walls in White, 'b' starts a ladder killing all White stones.
+]
 (;B[jf])
 (;B[kf]))
 (;B[ob]
 ;W[oa]
 ;B[md]
 ;W[oe]
 ;B[me]
 ;W[pd]
 ;B[pe]
 ;W[of]))))
 (;B[nd]
 ;W[rd]
 ;B[qe]
 ;W[re]LB[qf:A][qg:B]C['a' or 'b' are ok,
+]
 (;B[qf])
 (;B[qg]))
 (;B[pc]LB[qb:A][oc:B]C['a' lets Black build a wall to the top, 'b' to the right side.
+]
 (;W[qb]
 ;B[nd]
 ;W[rd]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;B[oc]C[Later
 ])
 (;W[oc]
 ;B[pd]
 ;W[rb]
 ;B[rc]
 ;W[qb]
 ;B[nd]
 ;W[rd]
 ;B[re]
 ;W[sc]))))
 (;B[nd]
 ;W[mc]LB[ld:b][md:a]C[Variation continues with Black 'a'. Black 'b' has been seen in professional games (Cho Chikun played it against Kato Masao in the 1st game of the 1983 Judan title).]
 (;B[md]LB[lc:B][qc:A]C['a' or 'b'.]
 (;W[qc]LB[rc:b][rd:a]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[lc]
 ;B[qj])
 (;B[rc]LB[rb:b][lc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[lc])
 (;W[rb]C[White 10 is a mistake.]
 ;B[pc]
 ;W[qb]
 ;B[lc])))
 (;W[lc]
 ;B[ke]
 ;W[ic]))
 (;B[ld]LB[lc:b][md:a]C[Black 7 is a stretch. Black is willing to follow up with 'a' or 'b'.]
 ;W[qc]
 ;B[rd]
 ;W[kb]
 ;B[md]))
 (;B[ob]
 ;W[oc]
 ;B[pc]
 (;W[nd]C[One of the best ways for White]
 ;B[nb]
 ;W[oe]
 ;B[pd]
 ;W[lc]
 ;B[qb]
 ;W[mf]C[Result is equal])
 (;W[nb]
 ;B[qb]
 (;W[oa]
 (;B[kc]
 ;W[lb]C[According to An Younggil, 8p it's the best way for White])
 (;B[kd]
 ;W[me]
 ;B[oe]
 ;W[lc]
 ;B[kc]
 ;W[lb]C[Result is equal]))
 (;W[jc]C[Also possible])))))
 (;B[lc]LB[qc:A][pd:B][ne:C]C[
 Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
 --------------------------------------------------------------
 'a' or 'b' are ok. 'c' is a new development.
+]
 (;W[qc]LB[pc:A][rc:B][pd:C]TR[pj]C['a' is the deep-deep-joseki and takes the top side.
 With 'b', Black keeps the right side.
 'c' is joseki with a stone on the triangled position.]
 (;B[pc]
 ;W[pd]LB[pb:c][qb:a][od:b]C[Black continues with 'a'. In the deep-deep-joseki, White plays a deep approach with 2, and of the two ataris 'a' and 'b', White plays the deep atari 'a' at first.
 Black 'b' is a mistake.
 Black 'c', basically a sacrifice play, is possible.]
 (;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[rb]LB[of:a][pg:b]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[oe]
 ;B[ne]LB[qe:a][pf:b]C[White continues with 'a'. White 'b' is a vulgar mistake.]
 (;W[qe]LB[nd:A][nf:B][qf:C]C[Black continues with 'a', 'b' or 'c'.]
 (;B[nd]
 ;W[nf]C[Later, White can continue here.]
 ;B[og]
 ;W[mf]
 ;B[qf]
 ;W[re]
 ;B[nh])
 (;B[nf]
 ;W[qg]LB[nb:e][jc:c][nd:d][re:b][qf:a]C[White 18 is big, as it prevents Black 'a', which White must answer with 'b'. White looks to playing 'c', after which 'd' and 'e' become tempting.])
 (;B[qf]LB[re:A][nf:B]C['a' is correct, cutting like 'b' is not recommended.]
 (;W[re]
 ;B[nf])
 (;W[nf]
 ;B[re]
 ;W[rd]
 ;B[pf]
 ;W[qd]
 ;B[me])))
 (;W[pf]C[White 6 is a mistake.]
 ;B[pg]LB[re:a][nf:b]C[White must play 'a'. Black 'b' is a mistake.]
 (;W[re]
 ;B[nf])
 (;W[nf]C[White 18 is a mistake.]
 ;B[qf]
 ;W[og]
 ;B[qe]
 ;W[of]
 ;B[ph]
 ;W[nd]
 ;B[nb]LB[pb:b][me:a]C[White 'a' and the White corner stones die. White 'b' (a live corner) and Black gets 'a'.]
 (;W[me]
 ;B[ob])
 (;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[me]))))
 (;B[pg]LB[oe:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[nd]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[le]
 ;W[ng])
 (;W[of]
 ;B[og]
 ;W[nf]
 ;B[nd]
 ;W[qf]
 ;B[qg]
 ;W[rf])))
 (;B[od]C[Black 7 is a mistake in order.]
 ;W[pe]
 ;B[qb]
 ;W[oc]
 ;B[rc]
 ;W[pb]
 ;B[qc]
 ;W[ne]C[Black's pincer has lost its meaning.])
 (;B[pb]LB[qb:a][pe:b]C[White continues with 'a'. White 'b' is not as good.]
 (;W[qb]
 ;B[pe]
 ;W[od]
 ;B[rd]
 ;W[ob]
 ;B[rb]
 ;W[oc]
 ;B[rc]
 ;W[pa]
 ;B[qh]C[White 2 is not good shape, but capturing the two Black stones makes this a reasonable result.])
 (;W[pe]C[White 8 gives Black the corner for White thickness.]
 ;B[rc]
 ;W[qe]
 ;B[rd]
 ;W[ne])))
 (;B[rc]
 ;W[pc]
 ;B[re]LB[ne:A][oe:B]C['a' or 'b'.]
 (;W[ne])
 (;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg]
 ;W[le]
 ;B[ic]))
 (;AB[pj]
 ;B[pd]
 ;W[pc]
 ;B[od]
 ;W[nb]
 ;B[me]))
 (;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]
 ;W[oe]
 ;B[pf]
 ;W[rb]
 ;B[sb]
 ;W[of]
 ;B[pg])
 (;W[ne]C[new joseki development
 ]))
 (;B[kd]LB[qc:a][pd:b][ne:c]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 The two-space high and one-space high pincer are similar.
 White continues with 'a' or 'b'. White 'c' is not recommended.
+]
 (;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]LB[rb:a][qf:b]C[White continues with 'a'. White 'b' gives White sente at a cost of local loss.]
 (;W[rb]LB[nd:b][pg:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pg]
 ;W[of]
 ;B[nd]
 ;W[og]LB[rg:b][pi:a]C[Black continues with 'a' or 'b'.]
 (;B[pi]
 ;W[qg]C[
 * Joseki *])
 (;B[rg]
 ;W[re]
 ;B[qj]))
 (;B[nd]C[Black 13 is too mild.]
 ;W[pg]))
 (;W[qf]C[White 12 is not recommended unless sente is essential.]
 ;B[rb]
 ;W[rd]
 ;B[nd]))
 (;W[pd]LB[pc:c][qc:a][pe:d][qe:b]C[White 4 is a powerful play.
 Black continues with 'a' to 'd'.]
 (;B[qc]LB[qe:a][pf:b]C[White continues with 'a'. White 'b' makes White 4 pointless.]
 (;W[qe]
 ;B[pe]
 ;W[re]LB[pc:a][od:b]C[Black continues with 'a'. Black 'b' is not recommended, especially if White has a favorable ladder to the far corner.]
 (;B[pc]
 ;W[od]
 ;B[pf]
 ;W[qg]C[The future is uncertain, but fighting is certain.
 Black's pincer at 3 is not in great position, and the three Black corner stones are not quite alive, so White has little to fear.])
 (;B[od]C[Black 9 is not recommended.]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[pf]LB[oe:a]C[Black must defend with 15 against the cut at 'a'. If the ladder is favorable, White can cut at 'a' anyway.]))
 (;W[pf]C[White 6 is a mistake.]
 ;B[qe]
 ;W[nf]
 ;B[qg]))
 (;B[qe]
 ;W[qc]
 ;B[rc]LB[rb:b][pc:a][pe:c]C[White continues with 'a', or if White has a favorable ladder, the tough double hane of 'b'. White 'c' is also possible.]
 (;W[pc]
 ;B[rb]LB[kb:b][of:a]C[White typically continues with 'a', but may choose 'b' with a later aim.]
 (;W[of]C[A possible continuation.]
 ;B[pg])
 (;W[kb]LB[qg:a]C[White plays 10 to provide a base for his stones so as to play 'a' later.]))
 (;W[rb]LB[qb:a][pc:b]C[White must have the ladder to play this way.
 Black continues with 'a'. Black 'b' shows the ladder setup, playable only if Black has the ladder to the opposite corner (in which case White 8 is a mistake).]
 (;B[qb]
 ;W[pc]
 ;B[sb]
 ;W[pf]
 ;B[qf]
 ;W[qg]
 ;B[rg]
 ;W[pe])
 (;B[pc]
 ;W[qb]
 ;B[od]))
 (;W[pe]
 ;B[qf]
 ;W[rb]
 ;B[qb]
 ;W[pc]
 ;B[sb]
 ;W[og]
 ;B[ph]
 ;W[hd]))
 (;B[pc]
 ;W[qe]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[qc]LB[qb:a][oe:b]C[Black continues with 'a'. Black 'b' favors White.]
 (;B[qb]
 ;W[rd]
 ;B[nd]LB[rb:a][qi:b]C[As 'a' and 'b' are miai, White may continue elsewhere.])
 (;B[oe]LB[qb:b][rd:a][of:c]C[White continues with 'a'. White 'b' creates aji for Black. White 'c' is not recommended.]
 (;W[rd]
 ;B[og]LB[of:a]C[Black must play 13 or White plays 'a'.])
 (;W[qb]C[White 12 creates aji for Black.])
 (;W[of]C[White 12 is not recommended.]
 ;B[pf]C[A fight ensues with good odds towards Black.])))
 (;B[pe]
 ;W[qc]LB[rc:a][qe:b]C[Black continues with 'a'. Black 'b' is less favorable.]
 (;B[rc]
 ;W[pc]
 ;B[re]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg])
 (;B[qe]C[Black 7 is not recommended.]
 ;W[pc]LB[qi:a]C[White is satisfied to have some corner profit and be sufficiently
 settled.
 A Black extension to 'a' in gote is not recommended unless it works toward the bottom right corner.])))
 (;W[ne]C[White 4 is not recommended.]
 ;B[pf]LB[pc:b][qc:a]C[After Black 5, the exchange of White 'a', Black 'b' doesn't work well.]))
 (;B[]LB[nc:2][qd:1]C[
 Tenuki
 -------
 Black plays elsewhere.
 This position is covered as the variation Black on 2, White on 1.
 ])
 (;B[kc]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 If you know a different follow-up than the given one, please email kogo@waterfire.us.
+]
 ;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[rb]LB[of:B][pg:A]C['a' or 'b'.]
 (;B[pg]LB[oe:B][of:A]C['a' or 'b'.]
 (;W[of]
 ;B[nd]
 ;W[og]LB[rg:B][pi:A]C['a' or 'b'.]
 (;B[pi]
 ;W[qg])
 (;B[rg]
 ;W[re]
 ;B[qj]))
 (;W[oe]
 ;B[nd]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[le]
 ;W[ng]))
 (;B[of]
 ;W[oe]
 ;B[ne]
 ;W[qe]
 ;B[nd]
 ;W[qg]))
 (;B[ld]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 -------------------------------------------------------------------
 Not recommended.
+]
 ;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[rb]
 ;B[pg]
 ;W[of]
 ;B[nd]TR[ld]C[The traingled stone is now not in the best position.])
 (;B[jd]C[
 -Space High Pincer = Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia
 -----------------------------------------------------------------------------
 Not recommended.
+]
 ;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[rb]
 ;B[pg]
 ;W[of]
 ;B[nd]
 ;W[og]
 ;B[pi]
 ;W[qg]LB[lc:A]TR[jd]C[Because of the too wide position of the triangled position, White has now an invasion point on 'a'.])
 (;B[jc]C[
 -Space Low Pincer = Sangen Basami = Sekan Hyeopgong = San Jia
 ---------------------------------------------------------------
 Not recommended.
+]
 ;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[rb]
 ;B[pg]
 ;W[of]
 ;B[nd]
 ;W[og]
 ;B[pi]
 ;W[qg]LB[lc:A]TR[jc]C[Because of the bad position of the triangled stone, there is an invasion point on 'a'.]))
 (;W[nd]LB[kc:j][lc:e][nc:h][oc:b][pc:d][kd:k][ld:i][od:g][ne:c][pf:a][dp:f]C[
 -Space High Approch = Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaojia
 ------------------------------------------------------------------------------
 The great master Honinbo Shuei (1852-1906) favored the two-space high (niken taka-gakari) approach, especially in two stone handicap games. This approach move was very popular in the 1910s. Go Seigen frequently played this way, considering it a good "whole board" approach. In recent years, O Rissei has often used the two-space high approach.
 Almost all variations have been completely explored.
 Black plays 'a', 'b', 'c', 'd', 'e', elsewhere ('f') or 'k'. 'd' secures the corner, but is submissive. 'g' attaches to a weak stone, forcing it to strengthen. 'h' is an overplay. 'j' is not recommended.
 h8, g7, f6, e5, d4, c3, b2, a1
+]
 (;B[pf]LB[ic:b][jc:a][pc:c][qc:d][nd:1]TR[kc]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 Black 3 is peaceful. Black 3 was common when this approach move was first played, but no longer.
 White continues with 'a'. White 'b' is one space too far.
 White 'c' erases aji in the corner for White.
 If there is already a Black stone on the triangled position like in the Chinese Fuseki, White 1 was maybe doubtful. 'd' shows punishment variation to be compared with the 'a' variations.
+]
 (;W[jc]LB[lc:c][qj:a][dp:b]C[Black continues with 'a', plays elsewhere ('b'), or aggressively invades with 'c'.]
 (;B[qj]LB[pc:b][qc:a]C[
 * Joseki *
 The corner is now important. White continues with 'a'. White 'b' is insufficient.]
 (;W[qc]LB[pc:a][rc:b]C[If White goes into the corner, White 6 is the only move.
 Black continues with 'a'. Black 'b' is submissive.]
 (;B[pc]
 ;W[pd]LB[qb:b][od:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[od]
 ;W[pe]LB[oe:A][qe:B]C['a' is usual.
 If Black has the ladder, taking the corner with 'b' is possible.]
 (;B[oe]
 ;W[qe]
 ;B[qf]LB[rd:b][re:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]LB[qb:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[rd]
 ;B[pb]LB[nb:b][qb:a]C[White continues with 'a' or 'b'.]
 (;W[qb]
 ;B[nc]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[ph])
 (;W[nb]LB[oc:a]C[White 18 is a tesuji providing protection on the top side. White can still live in the corner, as Black must connect at 'a'.]
 ;B[rb]
 ;W[qb]
 ;B[qa]
 ;W[rc]
 ;B[oc]
 ;W[ra]
 ;B[sa]
 ;W[sc]LB[ng:a]C[Next, Black should play 'a' to protect the cutting point.]))
 (;B[qb]
 ;W[rd]
 ;B[oc]
 ;W[rb]
 ;B[ng]))
 (;W[rd]C[White 14 is a mistake.]
 ;B[re]
 ;W[qd]
 ;B[oc]LB[of:b][rf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rf]
 ;B[rg]
 ;W[se]
 ;B[of])
 (;W[of]C[The cut is premature.]
 ;B[rf]
 ;W[rb]
 ;B[ne]LB[pb:a][sc:b]C[White's cutting stone will be a burden. Besides, Black has the forcing move at 'a', requiring White 'b'.])))
 (;B[qe]
 ;W[oe]
 ;B[oc]
 ;W[rc]
 ;B[qf]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[ne]
 ;W[of]LB[ob:B][mc:A]C[If 'a', a ladder. If 'b', sente ko for White.]
 (;B[mc]
 ;W[md]
 ;B[og]
 ;W[nf]
 ;B[me]
 ;W[ld]
 ;B[mf])
 (;B[ob]
 ;W[mc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[pa]
 ;B[qa]
 ;W[na]
 ;B[pb]
 ;W[ma]
 ;B[oa]
 ;W[sa]
 ;B[sb]
 ;W[sc]
 ;B[rd]
 ;W[sa])))
 (;B[qb]LB[rc:b][qe:a]C[White continues with 'a'. White 'b' is not as favorable.]
 (;W[qe]
 ;B[rc]
 ;W[pe]
 ;B[re]
 ;W[qf])
 (;W[rc]C[White 10 is not recommended.]
 ;B[od]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[qf]
 ;W[re])))
 (;B[rc]C[Black 7 is weak.]
 ;W[pc]
 ;B[re]))
 (;W[pc]C[White 6 is a mistake.]
 ;B[qc]
 ;W[pd]
 ;B[pe]LB[lc:a][nc:c][md:b]C[White retains weak points at 'a', 'b', and 'c'.]))
 (;B[]LB[qc:b][pj:a]C[Black plays elsewhere. White continues with 'a' or 'b'.]
 (;W[pj]LB[pc:a][cq:b]C[Black continues with 'a'. Playing elsewhere ('b') results in a loss.]
 (;B[pc])
 (;B[]C[Black plays elsewhere, a local loss.]
 ;W[qc]LB[pc:a][rc:b]C[Black continues with 'a'. Black 'b' is submissive.]
 (;B[pc]
 ;W[pd]LB[qb:B][od:A][pe:C]C[Black continues with 'a'.
 'b' takes a small corner giving much influence.
 Black 'c' is not recommended.]
 (;B[od]
 ;W[pe]
 ;B[oe]
 ;W[qe]LB[oc:A][qf:B]C['a' is correct. 'b' is a mistake.]
 (;B[oc]
 ;W[rd]
 ;B[og]
 ;W[qg]
 ;B[lc])
 (;B[qf]
 ;W[re]
 ;B[oc]
 ;W[of]))
 (;B[qb]LB[rc:B][qe:A]C['a' is correct. 'b' is a mistake.]
 (;W[qe]
 ;B[rc]
 ;W[pe]
 ;B[re]
 ;W[qf])
 (;W[rc]
 ;B[od]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[oc]LB[rd:A][of:B]C['a' keeps the corner, 'b' loses it.]
 (;W[rd]
 ;B[og]
 ;W[qg]
 ;B[lc])
 (;W[of]
 ;B[nf]
 ;W[og]
 ;B[re])))
 (;B[pe]
 ;W[od]
 ;B[rc]LB[qb:B][qe:A]C['a' punishes, 'b' doesn't.]
 (;W[qe]
 ;B[qb]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qh]
 ;B[pg]
 ;W[rf])
 (;W[qb]
 ;B[re]
 ;W[rb]
 ;B[sb]
 ;W[pb])))
 (;B[rc]C[Black 7 is submissive.]
 ;W[pd]
 ;B[qe]
 ;W[pc]
 ;B[rb]
 ;W[qg])))
 (;W[qc]
 ;B[pc]
 ;W[pd]
 ;B[od]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[qf]LB[rd:b][re:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[re]
 ;B[oc]
 ;W[rf]LB[qb:a][of:b]C[Black continues with 'a'. Black 'b' is the safe move, but allows White 'a'.]
 (;B[qb]
 ;W[of]
 ;B[rc]
 ;W[og]
 ;B[ne]LB[pg:b][ph:a][rh:c]C[Black later aims at 'a', White 'b', Black 'c'.])
 (;B[of]C[Black 17 is not recommended.]
 ;W[qb]))
 (;W[rd]C[White 13 is not recommended.]
 ;B[re]
 ;W[qd]
 ;B[oc]
 ;W[of]C[Black has a tough fight ahead.]
 ;B[rf]
 ;W[rb]
 ;B[ne]LB[pb:a][sc:b]C[White will have trouble with the cutting stone. Black 'a' is sente, requiring White 'b'.])))
 (;B[lc]LB[oc:c][qc:b][ld:a]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[ld]LB[mc:A][md:B]C['a' or 'b' are ok.]
 (;B[mc]
 ;W[md]
 ;B[ob]
 ;W[kc]
 ;B[pc]C[Black gets a nice corner.])
 (;B[md]
 ;W[mc]
 ;B[me]
 ;W[lb]
 ;B[nc]
 ;W[kc]
 ;B[mb]
 ;W[lc]
 ;B[oc]))
 (;W[qc]LB[pc:b][pd:a]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[mc]LB[pc:a][ld:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[ld])
 (;B[ld]
 ;W[pc]
 ;B[od]LB[nb:a][oc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nb]C[White 12 is a good answer to Black 11.]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[lb]
 ;B[ke])
 (;W[oc]C[White 12 is a mistake.]
 ;B[ne]C[Now White cannot cross underneath to White 4.])))
 (;B[pc]
 ;W[pd]
 ;B[od]
 ;W[oc]
 ;B[pe]
 ;W[pb]
 ;B[pd]
 ;W[nb]
 ;B[qb]
 ;W[qa]
 ;B[rc]
 ;W[me]))
 (;W[oc]C[White 6 is weak.]
 ;B[le]
 ;W[nf]
 ;B[je]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb]
 ;B[qi])))
 (;W[ic]C[White 4 is one space too far from White 2.]
 ;B[kc]LB[qc:a][jd:b]C[Black must immediately play 5, to prevent White from consolidating his position.
 White may try 'a' or 'b'.]
 (;W[qc]C[White 6 makes for tough fighting.]
 ;B[pc]C[Black has the advantage now because of Black 5.])
 (;W[jd]C[White 6 doesn't work.]
 ;B[le]
 ;W[ld]
 ;B[kd]
 ;W[ke]
 ;B[md]
 ;W[me]
 ;B[lc]
 ;W[lf]
 ;B[nc]
 ;W[ld]
 ;B[mc]C[White is left with too many cutting points.]))
 (;W[pc]C[White 4 is not recommended.]
 ;B[qc]C[White 4 results in Black solidifying territory in the corner.])
 (;AB[kc]
 ;W[qc]LB[pc:A][rc:C][pd:B]C[Black punishes on 'a' or 'b'. 'c' is slack.]
 (;B[pc]
 ;W[pd]
 ;B[od]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[qf]LB[rd:B][re:A]C[White 'a' or 'b'.]
 (;W[re]
 ;B[qb]
 ;W[rc]
 ;B[oc]LB[rb:B][rf:A]C['a' or 'b'.]
 (;W[rf]LB[nd:2]TR[kc]C[The triangled Black stone is too near the Black wall, but White wasted a move with White 2, so the result is bad for White.])
 (;W[rb]
 ;B[ng]))
 (;W[rd]
 ;B[re]
 ;W[qd]
 ;B[oc]
 ;W[rf]
 ;B[rg]
 ;W[se]LB[of:B][qh:A]C['a' or 'b' are ok.]
 (;B[qh])
 (;B[of])))
 (;B[pd]
 ;W[pc]
 ;B[oc]
 ;W[od]
 ;B[ob]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[mc]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[pg])
 (;B[rc]
 ;W[pd]
 ;B[qe]
 ;W[qb])))
 (;B[oc]LB[ic:d][jc:e][nc:a][od:b][dp:c]TR[dd][pj]C[
 (knee-hit)
 ----------
 White can play at 'a', 'b', or elsewhere ('c').
 If Black has stones on the marked positions, White must jump lightly to 'd', as 'a' and 'b' would be too heavy and 'e' would be too close.
 c3, b2, a1
+]
 (;W[nc]
 ;B[od]LB[jc:b][nc:4][ne:a]C[White continues with 'a', or if faced with a impending checking extension on the top side, 'b'.
 If White is forced to play 'b', White 4 was a mistake.]
 (;W[ne]LB[nc:4][jd:c][oe:b][dp:a]C[
 * Joseki *
 Black may play elsewhere ('a'), as White's position is suprisingly weak. Of course, playing elsewhere is a loss locally.
 Continue locally with 'b'. 'c' is a punishment if White 4 was wrong.]
 (;B[]LB[qc:b][oe:a][qe:c]C[Black plays elsewhere.
 White continues with 'a' to 'c'. White 'c' leads to difficult fighting.]
 (;W[oe]LB[pe:B][qf:A]C[A possible continuation for White if Black plays elsewhere.
 'a' or 'b'.]
 (;AB[jd][pj]
 ;B[qf]
 ;W[oh]LB[og:B][pg:A]
 (;B[pg]
 ;W[og])
 (;B[og]
 ;W[ob]
 ;B[pb]
 ;W[qb]
 ;B[pc]
 ;W[qe]
 ;B[pe]
 ;W[pf]
 ;B[re]
 ;W[pg]
 ;B[ng]
 ;W[of]
 ;B[kg]
 ;W[pa]
 ;B[nb]
 ;W[oa]
 ;B[qc]
 ;W[mb]))
 (;B[pe]
 ;W[pf]
 ;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[qh]))
 (;W[qc]LB[pc:b][rd:c][oe:a]C[A possible continuation for White if Black plays elsewhere.
 Black continues with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[oe]C[Black gets his corner ravaged in playing 8, but this is the best continuation.])
 (;B[pc]C[Black 8 is a mistake.]
 ;W[rd]
 ;B[rc]
 ;W[qe]
 ;B[qb]
 ;W[pf])
 (;B[rd]C[Black 8 is a mistake.]
 ;W[ob]
 ;B[pb]
 ;W[pc]
 ;B[nb]
 ;W[pd]))
 (;W[qe]LB[rd:c][oe:a][pe:d][pf:b]C[A possible continuation for White if Black plays elsewhere.
 Black continues with 'a' or 'b'. Black 'c' or 'd' are not recommended.]
 (;B[oe]C[Difficult fighting ensues.])
 (;B[pf]C[Difficult fighting ensues.]
 ;W[rd]
 ;B[qc]
 ;W[qg])
 (;B[rd]C[Black 9 is submissive.]
 ;W[oe])
 (;B[pe]C[Black 8 is not recommended.]
 ;W[qf]
 ;B[pf]
 ;W[rd])))
 (;B[oe]C[Local continuation.]
 ;W[nf]
 ;B[pg]
 ;W[hc])
 (;B[jd]
 ;W[oe]
 ;B[qf]
 ;AB[pj]C[With this additional Black stone already on the board the given continuations exists.]
 ;W[oh]LB[og:B][pg:A]C['a' or 'b' leave White heavy.]
 (;B[pg]
 ;W[og])
 (;B[og]
 ;W[ob]
 ;B[pb]
 ;W[qb]
 ;B[pc]
 ;W[qe]
 ;B[pe]
 ;W[pf]
 ;B[re]
 ;W[pg]
 ;B[ng]
 ;W[of]
 ;B[kg]
 ;W[pa]
 ;B[nb]
 ;W[oa]
 ;B[qc]
 ;W[mb])))
 (;W[jc]
 ;B[ne]LB[ob:a][me:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[oe])
 (;W[me]C[White 8 is a mistake.]
 ;B[nb]
 ;W[mb]
 ;B[ob])))
 (;W[od]LB[nc:b][pc:c][pd:a]C[Black continues with 'a' or 'b'. Black 'b' leads to the large avalanche joseki.
 Black 'c' is submissive, and not recommended.]
 (;B[pd]
 ;W[nc]
 ;B[ob]C[
 * Joseki *])
 (;B[nc]C[Black 5 leads to the large avalanche joseki.]
 ;W[pd]
 ;B[pc]
 ;W[qe]
 ;B[md]LB[nc:7][oc:3][pc:5][md:9][nd:8][od:2][pd:4][qd:1][qe:6]C[For continuation, see the variation referenced by the numbers.])
 (;B[pc]C[Black 5 is a weak move.]
 ;W[qe]
 ;B[re]
 ;W[pd]
 ;B[rc]
 ;W[qf]
 ;B[rf]
 ;W[qh]))
 (;W[]LB[nc:b][od:a]C[White plays elsewhere. Black continues with 'a' or 'b'.]
 (;B[od]LB[ne:b][nf:a]C[White continues with 'a', possibly 'b'.]
 (;W[nf]
 ;B[ne]
 ;W[me]
 ;B[oe]
 ;W[mf]LB[lc:a][pg:b]C[Black may continue with 'a' or 'b'.])
 (;W[ne]
 ;B[mb]))
 (;B[nc]LB[ld:a][md:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ld]
 ;B[md]LB[mc:b][me:a]C[White continues with 'a' or 'b'.]
 (;W[me]
 ;B[mc]
 ;W[le])
 (;W[mc]
 ;B[od]))
 (;W[md]C[White 6 is heavy.]
 ;B[lc]C[Black 7 is a possible local continuation.])))
 (;AB[dd][pj]LB[ic:A][jc:B]
 (;W[ic]LB[gc:B][lc:C][nc:D][od:A]C['a', 'b' or 'c' are possible.
 'd' is bad.]
 (;B[od]
 ;W[fc])
 (;B[gc]
 ;W[nc]
 ;B[od]
 ;W[ne]
 ;B[oe]
 ;W[nf]
 ;B[pg])
 (;B[lc]
 ;W[fc]
 ;B[le])
 (;B[nc]C[Mistake]
 ;W[qe]C[Punishment]))
 (;W[jc]LB[nd:2]C[Too near White 2.]
 ;B[gc]
 ;W[nc]
 ;B[od]
 ;W[ne]
 ;B[pg]C[White overconcentrated.])))
 (;B[ne]LB[md:a][pd:c][me:d][oe:b]C[
 Uezuke (attach on top)
 Black aims for influence. Complex variations are possible.
 White responds at 'a' to 'c', 'd'. White 'a' and 'b' require a favorable ladder. White 'd' avoids complex variations.
 d4, c3, b2, a1
 This attachment is outdated]
 (;W[md]LB[od:b][oe:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[me]C[
 * Joseki *])
 (;B[od]C[Black 5 is a mistake.]
 ;W[oc]LB[pc:A][oe:B]C['a' is only playable with the ladder, 'b' is always possible.]
 (;B[pc]
 ;W[oe]
 ;B[pd]LB[nf:a][of:b]C[White continues at 'a' with a favorable ladder. If the ladder is not favorable, White may play 'b', but a fight ensues.]
 (;W[nf]C[White must have the ladder to play this way.])
 (;W[of]C[White does not have a favorable ladder to capture Black 3. A fight ensues.]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lf]LB[og:a]C[White must now cover the cutting point at 'a' while Black aims at White's stones on the top side.]))
 (;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[me])))
 (;W[oe]
 ;B[od]
 ;W[pd]
 ;B[oc]
 ;W[of]LB[pc:a][md:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pc]
 ;W[me])
 (;B[md]C[Black 9 gives White the advantage.]
 ;W[pc]
 ;B[nc]
 ;W[qe]))
 (;W[pd]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[od]
 ;B[qe]LB[qc:a][ld:b]C[White continues with 'a' or 'b'.]
 (;W[qc]
 ;B[md]
 ;W[mc]
 ;B[me]
 ;W[lc]
 ;B[rc]
 ;W[pb]
 ;B[qb]
 ;W[pc]
 ;B[rb]LB[og:A]C[
 * Joseki *
 This result is equal, because Black's wall has a severe weakness.
 If he doesn't defend it, White can later attack on 'a'.]
 ;W[og]LB[nf:B][pf:A]C['a' or 'b'.]
 (;B[pf]
 ;W[nf]
 ;B[ng]C[One possible continuation.]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[oh])
 (;B[nf]
 ;W[qg]
 ;B[pf]))
 (;W[ld]
 ;B[pc]
 ;W[nf]LB[me:B][og:A]C['a' is correct, 'b' starts an unnecessary fight.]
 (;B[og]LB[me:A][dp:B]C['a' or tenuki 'b' are ok.]
 ;W[me])
 (;B[me]
 ;W[og]
 ;B[pf]LB[md:B][ng:A]
 (;W[ng])
 (;W[md]
 ;B[lf]
 ;W[ng]))))
 (;W[me]LB[od:a][oe:b]C[Black continues with 'a'. Black 'b' is a trick play that can be foiled.]
 (;B[od]LB[oc:a][md:b]C[White continues with the tesuji at 'a'. White 'b' is not recommended.]
 (;W[oc]
 ;B[nc]
 ;W[md]
 ;B[ob]LB[pc:b][oe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oe]
 ;B[pc]
 ;W[nf])
 (;W[pc]C[White 10 is a mistake.]
 ;B[pd]LB[nb:b][mc:a]C[White may try 'a' or 'b'.]
 (;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[nf]C[White has given up much profit.])
 (;W[nb]
 ;B[mc]
 ;W[pb]
 ;B[mb]
 ;W[oa]
 ;B[kc]LB[rb:b][nf:a]C[White continues at 'a'. White 'b' is a mistake.]
 (;W[nf]
 ;B[rb]
 ;W[qb]
 ;B[rc]
 ;W[qa]
 ;B[qg]C[Black has a favorable result.])
 (;W[rb]C[White 18 is a mistake.]
 ;B[nf]C[Now White's three stones are in a world of hurt.]))))
 (;W[md]LB[oc:a][oe:b]C[White 6 is not recommended.
 Black continues at 'a'. Black 'b' is a mistake.]
 (;B[oc]
 ;W[nf]
 ;B[oe]
 ;W[lg])
 (;B[oe]C[Black 7 is a mistake.]
 ;W[mg])))
 (;B[oe]LB[ld:a][od:b]C[Black 5 is a trick. White continues with 'a'. White 'b' falls into the trap.]
 (;W[ld]
 ;B[od]
 ;W[nc])
 (;W[od]LB[md:b][pd:a]C[White hopes for Black 'a', White 'b'.]
 ;B[md]C[Instead, Black cuts.]
 ;W[pe]
 ;B[pd]
 ;W[mc]
 ;B[ld]
 ;W[le]
 ;B[ke]C[Now White cannot catch Black in any ladder.]
 ;W[kf]LB[lf:a][pf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[lf]
 ;W[mf]
 ;B[mg]
 ;W[lg]
 ;B[nf]
 ;W[lf]
 ;B[lc]
 ;W[ng]
 ;B[of]
 ;W[oc]
 ;B[pc]
 ;W[ob]LB[pb:b][pf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pf]
 ;W[lb]
 ;B[kb]
 ;W[mb]
 ;B[kc]
 ;W[pb]
 ;B[qb]
 ;W[pa]
 ;B[mh]
 ;W[je]
 ;B[hc])
 (;B[pb]C[Black 27 leads to a ko that is not favorable for Black.]
 ;W[lb]
 ;B[kb]
 ;W[nb]
 ;B[la]
 ;W[ma]
 ;B[mb]
 ;W[pg]LB[pf:a][og:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pf]
 ;W[qf]
 ;B[qe]
 ;W[og]
 ;B[pe]
 ;W[lb])
 (;B[og]C[Black 35 is a mistake.]
 ;W[oh]
 ;B[nh]
 ;W[pf]
 ;B[ng]
 ;W[ni])))
 (;B[pf]C[Black 15 is a mistake.]
 ;W[kd]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[jc]
 ;B[kb]
 ;W[jb])))))
 (;B[pc]C[
 Kosumi = Ibkucha = Jian = Diagonal
 -----------------------------------
 Black 3 is somewhat slower than the joseki moves, but forces White to play lightly in the center and disables him to close off one side for territory in sente. White will probably play elsewhere. The follow-up is shown.
+]
 ;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[pf]
 ;W[of]
 ;B[qf]
 ;W[ng]LB[qh:a]C[Black later plays 'a', but there is no hurry, as Black's corner is secure. White blocking Black on the right is not a worry for Black.])
 (;B[lc]LB[oc:b][qc:d][pd:a][pe:c][dp:e]C[
 Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
 --------------------------------------------------------------
 Black 3 is the only pincer against White 2. White aims at the
 corner contact play. Black 3 is the only way to forstall that
 move.
 White continues with 'a' or 'b'. 'c' aims for influence.
 White 'd' is not good.
 'e' covers playing elsewhere.
+]
 (;W[pd]LB[pc:d][qc:a][pe:b][qe:c]C[Black continues with 'a' or 'b'. Black 'c' is a slack move.
 'd' takes the corner and gives the right side.]
 (;B[qc]LB[ld:b][pf:a]C[White continues with 'a' or 'b'.]
 (;W[pf]
 ;B[qe]
 ;W[mf]
 ;B[qg]
 ;W[kd]C[
 * Joseki *])
 (;W[ld]LB[kd:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[kd]
 ;W[le]
 ;B[mc]
 ;W[qe]LB[pc:a][pe:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[pe]
 ;B[nc])
 (;B[pe]C[Black 11 is a mistake.]
 ;W[qf]
 ;B[od]
 ;W[oe]
 ;B[pc]
 ;W[pf]
 ;B[nc]
 ;W[pd]
 ;B[oc]C[White has a better position than the joseki.]))
 (;B[pe]
 ;W[mc]
 ;B[pg]
 ;W[kc])))
 (;B[pe]LB[qc:a][qe:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[qc]LB[rc:a][re:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]LB[pc:a][qe:b]C[White continues with 'a' or 'b'. White 'b' leads to a fight with equal prospects.]
 (;W[pc]
 ;B[re]
 ;W[oe]
 ;B[pf]
 ;W[id])
 (;W[qe]C[White 8 shows fighting spirit.]
 ;B[rd]
 ;W[re]
 ;B[pf]
 ;W[qg]LB[od:b][pg:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pg]
 ;W[qh]
 ;B[pc]
 ;W[od]
 ;B[pb]LB[me:a][ph:b]C[White next plays 'a' or 'b', depending on the position.])
 (;B[od]C[Black 13 is not recommended, as Black loses the corner.]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[rb]
 ;B[nb]LB[pb:a][dp:b]C[White continues with 'a'. White risks a ko playing elsewhere ('b').]
 (;W[pb])
 (;W[]C[White plays elsewhere, risking a ko.]
 ;B[qb]
 ;W[pb]
 ;B[ra]LB[qa:a][sb:b]C[White continues with 'a'. White 'a' leads to a two-stage ko.
 White 'b' leads to a direct ko.]
 (;W[qa]
 ;B[sb])
 (;W[sb]
 ;B[pa])))))
 (;B[re]LB[oc:C][pc:A][rd:B]C['a' and 'b' lead to the same position.
 'c' is not recommended.]
 (;W[pc]
 ;B[oe]
 ;W[rd]
 ;B[qe]
 ;W[mb]
 ;B[qj])
 (;W[rd]
 ;B[qe]
 ;W[pc]
 ;B[oe]
 ;W[mb]
 ;B[qj])
 (;W[oc]
 ;B[rc]
 ;W[oe]
 ;B[pf]
 ;W[qb]
 ;B[jd])))
 (;W[qe]C[White 6 is unreasonable.]
 ;B[qc]
 ;W[qf]
 ;B[pf]
 ;W[pg]
 ;B[of]LB[od:b][qg:a]C[Blackk 11, ironically good shape here (usually bad shape), makes miai of 'a' and 'b'.]))
 (;B[qe]C[Black 5 is not recommended.]
 ;W[qc]
 ;B[rc]LB[pb:A][pe:B]C['a' or 'b'.]
 (;W[pb]
 ;B[rb]
 ;W[id]C[White has comfortable shape and can switch to 10.])
 (;W[pe]
 ;B[qf]
 ;W[rb]
 ;B[qb]
 ;W[pc]
 ;B[sb]
 ;W[pg]))
 (;B[pc]
 ;W[qe]
 ;B[od]
 ;W[pe]
 ;B[oc]
 ;W[oe]))
 (;W[oc]C[White 4 reverts to the small knight approach move with two-space low pincer joseki. See there for possible variations to follow this move.])
 (;W[pe]LB[pd:a][qe:b]C[White aims for influence only.
 Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[od]
 ;B[qe]
 ;W[pf]LB[qg:B][rg:A]C['a' is ok, 'b' possible.]
 (;B[rg]
 ;W[kd])
 (;B[qg]LB[hd:B][kd:A]C['a' is usual, 'b' complicated.]
 (;W[kd])
 (;W[hd]LB[hb:b][le:a][nf:c]C[White 10 presumes White support in the upper left corner.
 Depending upon whole board strategy, Black continues with 'a' to 'c'.]
 (;B[le]LB[mf:a][nf:b]C[White presses with 'a'. White 'b' is defensive.]
 (;W[mf]
 ;B[jd])
 (;W[nf]
 ;B[lg]
 ;W[oi]))
 (;B[hb]C[Black 11 aims to live at top, at the cost of giving White thickness.]
 ;W[hc]
 ;B[ib]
 ;W[gb]
 ;B[jd])
 (;B[nf]C[Black 11, a forcing move, emphasizes the right, at the expense of Black 3.]
 ;W[me]
 ;B[ph]
 ;W[mf]))))
 (;B[qe]C[Black 5 ends up weakening Black 3, so reflects a change in strategy.]
 ;W[pd]
 ;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pc]
 ;B[ra]
 ;W[og]LB[qg:a]C[White can aim at 'a' later.]))
 (;W[qc]LB[pc:b][pd:a]C[White 4 is unreasonable.
 Black continues with 'a' to take the outside.
 Black 'b' takes the corner and is not recommended.]
 (;B[pd]
 ;W[pc]
 ;B[oc]LB[ob:b][od:a]C[White continues with 'a'. White 'b' is submissive.]
 (;W[od]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf])
 (;W[ob]C[White 8 is submissive.]
 ;B[nc]
 ;W[nb]
 ;B[mc]))
 (;B[pc]C[Black 5 is not recommended.]
 ;W[pd]
 ;B[pb]
 ;W[qe]
 ;B[rd]
 ;W[pe]
 ;B[rc]
 ;W[oc]C[White gets nice outside shape (even though Black can later connect underneath at top).]))
 (;W[dp]
 ;B[le]))
 (;B[]C[
 Tenuki
 -------
 Black plays elsewhere.
+]
 ;W[qc]LB[pc:a][rc:c][cq:b]C[Black continues with 'a'. Black 'b' shows White's follow-up if Black plays elsewhere again. 'c' is slack.]
 (;B[pc]
 ;W[pd]LB[pb:a][rc:b][od:c]C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
 (;B[pb]LB[qb:b][qe:a]C[White continues with 'a' or 'b'.
 White 'a' ends with White sente.
 White must have the ladder to play 'b'.]
 (;W[qe]C[Though an equal result, and ending in sente, White 7 is not very
 satisfying.]
 ;B[rd]
 ;W[pe]
 ;B[rc])
 (;W[qb]LB[rb:a][rd:b]C[White must have the ladder to play this way.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rb]LB[rc:a][rd:b]C[White continues with 'a' or 'b'. White 'b' starts a fight.]
 (;W[rc]
 ;B[rd]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[nb]LB[od:b][pe:a]C[White continues with 'a' or 'b'.]
 (;W[pe]
 ;B[sd]
 ;W[qe]
 ;B[sc]
 ;W[sa]
 ;B[rb])
 (;W[od]LB[sd:B][qf:A]C['a' is correct. 'b' is a mistake.]
 (;B[qf]
 ;W[ob]
 ;B[oc]
 ;W[nc]
 ;B[oa]
 ;W[mb]
 ;B[lb]LB[sa:A][pf:B]C['a' is correct. 'b' is a mistake.]
 (;W[sa]
 ;B[pa]LB[ma:b][pf:a]C[White continues with 'a'. White 'b' does not work.
 There is a ladder involved that should favor Black.]
 (;W[pf]LB[mc:b][pe:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pe]
 ;W[oe]
 ;B[qe]LB[ma:a][qg:b]C[White continues with 'a' with a favorable ladder running to the bottom left, or 'b' the ladder is unfavorable.]
 (;W[ma]C[White must have the ladder to play this way.]
 ;B[mc]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[of]
 ;W[ne]
 ;B[ld]LB[kc:a][nf:b]C['b' is a ladder that must favor Black for 'a' and 'b' to be miai.])
 (;W[qg]C[White plays this way when the ladder is unfavorable.]
 ;B[rg]
 ;W[rh]LB[rf:b][pg:a]C[Black continues with 'a'. Black 'b' captures the corner, but gives White superior thickness.]
 (;B[pg]
 ;W[of]
 ;B[qh]
 ;W[ma]
 ;B[mc]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[ld]
 ;W[la]
 ;B[mg]C[White gets the corner, Black get slightly better influence.])
 (;B[rf]C[Black 32 is not recommended.]
 ;W[pg]
 ;B[sd]
 ;W[lc]C[Locally, White's thickness is better than Black's corner profit.])))
 (;B[mc]C[Black gives up the fight.]
 ;W[md]
 ;B[lc]
 ;W[qg]
 ;B[qe]
 ;W[rf]C[White 32 ensures capture of the Black stones.]
 ;B[pe]
 ;W[of]))
 (;W[ma]C[White 26 is a mistake.]
 ;B[mc]
 ;W[lc]
 ;B[md]
 ;W[kb]LB[ld:b][ne:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne])
 (;B[ld]C[Black 31 is a mistake.]
 ;W[la]C[And White wins the fight.])))
 (;W[pf]
 ;B[pe]
 ;W[oe]
 ;B[qe]
 ;W[qg]
 ;B[rg]
 ;W[rh]
 ;B[pg]
 ;W[of]
 ;B[qh]
 ;W[ma]
 ;B[mc]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[ld]
 ;W[la]
 ;B[mg]))
 (;B[sd]
 ;W[sa]LB[ob:A][qe:B]C[White can take stones on 'a' or 'b'.])))
 (;W[rd]C[White 9 starts a fight.]
 ;B[qe]
 ;W[rc]
 ;B[nb]
 ;W[pe]
 ;B[qf]
 ;W[sb]
 ;B[lc]
 ;W[og]
 ;B[ph]C[White's center stones are hard-pressed, but the overall board position may make this reasonable.]))
 (;B[rd]C[Black 8 was once considered joseki, but White gets great shape, so this sequence is now considered favorable to White.]
 ;W[oc]
 ;B[pe]
 ;W[od]
 ;B[rb]
 ;W[ob]
 ;B[rc]
 ;W[pa]
 ;B[qh])))
 (;B[rc]C[Black 7 lacks style, and gives White a better result.]
 ;W[qb]
 ;B[pe]
 ;W[od]
 ;B[re]
 ;W[rb]
 ;B[sb]
 ;W[ob]
 ;B[pg])
 (;B[od]C[Black 7 is not a good move.]
 ;W[pe]
 ;B[oc]
 ;W[oe]
 ;B[rc]
 ;W[qb]
 ;B[rb]LB[rd:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[rd]
 ;W[nc]
 ;B[pb]
 ;W[ob]
 ;B[qa]
 ;W[mf])
 (;W[rd]
 ;B[qe]
 ;W[qf]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[nc])))
 (;B[]C[Black plays elsewhere again.]
 ;W[pd]LB[qd:1][pe:a][qe:b]C[This position is the same as Hoshi-Tenuki-Ikkentobi in reversed color, for the continuation see the White 34-invasion into a Black moyo of the 4-4-point, the 3-10-point and the 4-6-point.
 Black continues with 'a' or 'b'.])
 (;B[rc]
 ;W[pc]
 ;B[re]
 ;W[jc]))
 (;B[od]LB[oc:a][oe:b]C[
 Tobi-Tsuke (jump attach)
 ---------------------------
 White continues with 'a'. White 'b is a mistake in direction.
+]
 (;W[oc]LB[pc:b][oe:a]C[Black continues with 'a' or 'b'.]
 (;B[oe]
 ;W[pc]
 ;B[qc]
 ;W[kc])
 (;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[ne]))
 (;W[oe]C[White 4 is a mistake in direction.]
 ;B[oc]
 ;W[ne]
 ;B[nc]
 ;W[ld]
 ;B[pe]))
 (;B[nc]LB[mc:b][oc:a]C[Black 3 is an overplay.
 White continues with 'a'. White 'b' is submissive.]
 (;W[oc]
 ;B[od]
 ;W[pd]
 ;B[oe]
 ;W[pc]LB[md:B][pe:A]
 (;B[pe]
 ;W[mc]
 ;B[nb]
 ;W[mb])
 (;B[md]C[Black 9 is a mistake. White gets great profit.]
 ;W[pe]
 ;B[ne]
 ;W[pf]))
 (;W[mc]C[White 4 is submissive.]
 ;B[oc]
 ;W[md]
 ;B[jd]))
 (;B[ld]LB[oc:B][pd:A]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 ----------------------------------------------------------------------------
 'a' or 'b' are ok.
+]
 (;W[pd]LB[qc:A][pe:B]C['a' or 'b' are ok.]
 (;B[qc]
 ;W[pf]
 ;B[qe]
 ;W[mf]
 ;B[qg]
 ;W[ke])
 (;B[pe]
 ;W[qc]
 ;B[re]
 ;W[oc]
 ;B[rc]
 ;W[oe]
 ;B[pf]
 ;W[qb]))
 (;W[oc]LB[oc:4][nd:2]C[Same variation as White 4 played before White 2.]))
 (;B[kc]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
+]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[ke])
 (;B[kd]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
+]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qg]
 ;W[hd]))
 (;W[od]LB[kc:h][lc:g][mc:f][oc:d][pc:l][kd:k][ld:j][md:i][pd:m][oe:e][pe:n][pf:a][qf:b][qg:c][dp:o]TR[ec]C[
 -Space High Approach = Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaogua`jiao~
 ------------------------------------------------------------------------------------
 The 5-4 approach move has become more popular in modern times, as modern Go emphasizes speed and influence.
 Black responds at 'a', 'b', 'c', 'd', 'e', 'f', 'h', 'i', 'j', 'k', 'l', 'm', or plays elsewhere 'o'. If Black is in the top left corner with a low shimari at the triangled point, Black should not pincer, but play at 'a'.
 If Black is in the top left corner with a high shimari at the squared point, Black should not extend, but play at 'f'.
 'a' also covers  the development in the Chinese Fuseki.
 Black 'n' is slow.
 'g' is a rare move, undecided between the two intentions of putting pressure on White like with 'f' or influencing the top left side, like with 'h'.
 k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1, b2, c3 - Black right; White top
 d3 - Black corner & right; (small, large) Avalanche
 e4, f5 - Black choice
 i7, k8 - Black right; White top
 j6 - Black choice; Magic Sword of Muramasa
 l10 - Black corner & sente; White top
 m9 - Black corner & right; White top
 n11 - various
 ]MA[ed]
 (;B[pf]LB[qc:a][of:c][qh:b][dp:d]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 Black 3 is a peaceful response, aiming to maintain balance with White's high approach.
 White continues with 'a'. White 'b' and 'c' represents unorthodox strategies. 'c' appears against the Chinese Fuseki.
 Tenuki is a mistake.
+]
 (;W[qc]LB[pc:B][rc:A]C['a' is joseki
 'b' is trickmove, often played by Alexander Dinerchtein in handicap games]
 (;B[rc]LB[lc:C][pc:A][od:2][of:B]C['a' is usual, 'b' appears the Chinese Fuseki.
 In the Kobayashi fuseki, White must flee to 'c', because 2 was wrong.
 Recently it's very popular to extend at C and avoid complicated patterns]
 (;W[pc]LB[rb:b][ld:c][re:a]C[Black continues with 'a', 'b' or 'c'.]
 (;B[re]LB[kc:A][lc:B][mc:C]C['a' is usual, 'b' is more safe. 'c' appears in the Chinese Fuseki.]
 (;W[kc]LB[ic:B][ne:A]C[Later, Black can play 'a' or 'b'.
 * Joseki *
 Slightly outdated. Nowadays it's more popular to extend at M17 (ogeima extension).]
 (;B[ne]LB[mc:a][oe:b]C[Continuation. White continues with 'a' or 'b'.]
 (;W[mc]
 ;B[ld]
 ;W[lc])
 (;W[oe]
 ;B[of]
 ;W[nf]
 ;B[me]
 ;W[mc]
 ;B[ld]
 ;W[lc]
 ;B[ng]))
 (;B[ic]LB[ke:A][dp:B]C[White answers on 'a', tenuki 'b' is not good.]
 (;W[ke])
 (;W[dp]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kb]
 ;W[kd]
 ;B[jc])))
 (;W[lc]C[White can no more be attacked.
 Many professionals think that White has a favorable result.])
 (;AW[pp]AB[kc]
 ;W[mc]
 ;B[qn]
 ;W[nq]
 ;B[nf]TR[pj]C[This is also and especially the correct move if Black is already on the triangled position.]
 ;W[me]
 ;B[ne]
 ;W[nd]
 ;B[ld]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]
 ;W[md]
 ;B[pj]C[
 * Joseki *]))
 (;B[rb]LB[kc:A][mc:B]C['a' is usual. In the Chinese Fuseki, only 'b' is possible.]
 (;W[kc]LB[ic:b][ne:c][qj:a]C[Black extends to 'a', or, with support in the top-left corner, may play 'b'. If 'b' doesn't work (because of lack of support),
 Black may press at 'c'.]
 (;B[qj]C[
 * Joseki *])
 (;B[ic]LB[ke:a][dp:b]C[Black may play 9 as a check if there is Black support in the top-left corner. White must reply; 'a' is suitable. White cannot afford to play elsewhere ('b').]
 (;W[ke])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kb]
 ;W[kd]
 ;B[jc]
 ;W[nc]))
 (;B[ne]LB[mc:a][oe:b]C[White may submit with 'a'. If the ladder to the bottom left corner favors White, White may resist with 'b'.]
 (;W[mc]C[White plays 10 when the ladder is unfavorable.]
 ;B[ld]
 ;W[lc])
 (;W[oe]C[White must have the ladder to play this way.]
 ;B[of]
 ;W[nf]C[White 12 must not be able to be caught in a ladder.]
 ;B[me]
 ;W[mc]C[White 14 can only be played if White 12 cannot be captured in
 a ladder.]
 ;B[ld]C[Black 16 takes care of the ladder issue for White 12.]
 ;W[lc]LB[ng:a]C[White might like to resist with 'a', but White 16 is correct.]
 ;B[ng]C[White 12 can be captured because of the Black 15, White 16 exchange.
 White has territory in sente, Black has thickness: a fairly even exchange.]
 ;W[mf]
 ;B[lg])))
 (;AB[kc]
 ;W[mc]
 ;B[nf]
 ;W[me]
 ;B[ne]
 ;W[nd]
 ;B[ld]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]
 ;W[md]C[
 * Joseki *]))
 (;B[ld]LB[rb:B][qe:A]C['a' or 'b' are possible.]
 (;W[qe]LB[pe:B][re:A]C['a' or 'b' are possible.]
 (;B[re]
 ;W[pd]
 ;B[rd]
 ;W[qf]LB[pd:10][qf:12]C[White 10 and 12 are often played in reverse order.
+]
 ;B[pe]
 ;W[qg]
 ;B[pg]
 ;W[qh]LB[qb:A][ph:B]C['a' is correct. 'b' is a mistake.]
 (;B[qb]
 ;W[pb]
 ;B[qa]
 ;W[me]LB[rf:A]
 ;B[ng]LB[le:A][oi:B]C['a' is correct. 'b' is a mistake.]
 (;W[le]LB[jd:B][ph:A]C['a' or 'b' are possible.]
 (;B[ph]
 ;W[kd]
 ;B[qi])
 (;B[jd]
 ;W[pj]))
 (;W[oi]
 ;B[ph]
 ;W[pi]
 ;B[qi]))
 (;B[ph]LB[rb:A][rf:B]C['a' kills, 'b' dies.]
 (;W[rb]
 ;B[qi]
 ;W[ri]LB[rf:B][rh:A]C[Neither 'a' nor 'b' work.]
 (;B[rh]
 ;W[rg]
 ;B[rj]
 ;W[sh]
 ;B[qj]
 ;W[sf]
 ;B[rf]
 ;W[sc]
 ;B[sj]
 ;W[si])
 (;B[rf]
 ;W[qj]
 ;B[pi]
 ;W[rh]))
 (;W[rf]
 ;B[qb]
 ;W[pb]
 ;B[qa]
 ;W[sb]
 ;B[rb]
 ;W[sa]
 ;B[se]
 ;W[sc]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[qj]
 ;B[pi]
 ;W[sh]
 ;B[rk]
 ;W[rg]
 ;B[sf])))
 (;B[pe]
 ;W[rd]
 ;B[pd]LB[rb:A][re:B]C['a' or 'b' are ok.]
 (;W[rb]LB[oc:A][re:B]C['a' is correct. 'b' is questionable.]
 (;B[oc]LB[ob:A][nc:B]C['a' is correct. 'b' is questionable.]
 (;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[re])
 (;W[nc]
 ;B[ob]LB[nb:B][pb:A]C['a' or 'b' don't help much.]
 (;W[pb]
 ;B[nd]
 ;W[oe]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[pa]
 ;W[sc]
 ;B[md])
 (;W[nb]
 ;B[qb]
 ;W[sc]
 ;B[pb]
 ;W[rc]
 ;B[nd]
 ;W[oe]
 ;B[mc])))
 (;B[re]
 ;W[sc]))
 (;W[re]
 ;B[oc]LB[ob:A][nc:B]C['a' is honest, 'b' just takes less territory.]
 (;W[ob]
 ;B[nc]
 ;W[rb])
 (;W[nc]
 ;B[ob]
 ;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[pb]
 ;W[rc]
 ;B[nd]
 ;W[oe]
 ;B[mc]))))
 (;W[rb]
 ;B[qj]LB[re:A]C[Later White A])))
 (;W[of]
 ;B[og]LB[qc:4][of:6]C[Same position as White 6 played before 4. See there for continuation.
 ])
 (;AW[dp][pp][nq]AB[dd][pj][qn]
 ;W[lc]
 ;B[pc]
 ;W[ic]))
 (;B[pc]
 ;W[pd]
 (;B[oc]
 (;W[qe]
 ;B[rd]
 (;W[qb]
 ;B[nd]
 (;W[ne]
 ;B[md]
 (;W[rf]C[One of the best ways for White])
 (;W[re]
 ;B[rf]C[Tesuji!]
 ;W[rc]
 ;B[oe]
 ;W[pe]
 ;B[of]C[White is sealed, so it's very painful for White.])
 (;W[pe]
 ;B[rf]
 ;W[re]
 ;B[se]
 ;W[qf]
 ;B[qg]
 ;W[oe]
 ;B[rh]C[White can live in the corner, but anyway too painful for him.]))
 (;W[oe]
 (;B[mc]
 ;W[re]
 ;B[nf]
 ;W[pe]C[Rare joseki])
 (;B[nf]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[ne]
 ;W[ob]
 ;B[of]
 (;W[pb]C[Slightly better for White])
 (;W[pe]C[Very greedy. Black has lot of sente moves around.])))
 (;W[re]
 ;B[pe]
 ;W[oe]
 ;B[nf]C[Even if the ladder is bad for Black, he can get nice result by sacrificing 2 stones.]))
 (;W[nd]
 ;B[qb]
 ;W[pe]C[Best punishment of Black's trickmove.]))
 (;W[nc]C[Not the best choice for White]
 ;B[qb]
 ;W[rc]
 ;B[rb]C[Quite complicated, but usually bad for White.]
 (;W[pb]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[qe]
 ;B[nd]
 ;W[rd]
 ;B[ne]
 ;W[lc]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[rf]
 ;B[pe]
 ;W[qh]
 ;B[qi]
 ;W[ph]
 ;B[rj]
 ;W[se]
 ;B[oe]
 ;W[qd]
 ;B[oi]C[Big success for Black])
 (;W[nd]
 ;B[qe]
 ;W[nb]
 ;B[pa]C[Slightly better for Black])
 (;W[nb]
 ;B[rd]
 ;W[pb]
 ;B[sc]
 ;W[qc]
 ;B[qi]C[Black is slightly better])))
 (;B[qb]C[Became popular in 2010 in China. Usually played with Chinese fuseki.]
 (;W[qe]
 ;B[rc]
 ;W[rd]
 ;B[qc]
 ;W[pe]
 ;B[of]C[If Black is thick outside, he can get benefit from attacking])
 (;W[rc]
 ;B[qe]C[Black needs extra stones outside for playing this way]))))
 (;W[qh]C[White 4 is a tough-minded move.
 Rin Kaiho played White 4 against Yoshio Ishida in the 3rd game of the 1974 Oza title match.]
 ;B[ld]
 ;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[qc]
 ;W[re]
 ;B[ne]
 ;W[pb]
 ;B[qb]
 ;W[nb]
 ;B[rd]
 ;W[qg]
 ;B[mc]LB[lc:a][nd:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[lc]LB[oc:b][pc:a]C[White 18 is the tesuji that lets top White group live.
 Black continues with 'a'. Black 'b', letting White live in the corner, is too mild.]
 (;B[pc]
 ;W[oc]
 ;B[pa]
 ;W[mb]
 ;B[kc]
 ;W[lb]
 ;B[ob]
 ;W[md]
 ;B[le]LB[kd:a][oe:b]C[The cut of 'a' is correct. In the actual game, White played 'b'.]
 (;W[kd])
 (;W[oe]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[ng]
 ;B[nh]
 ;W[lf]LB[oi:b][pi:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pi]C[Black can capture the White group on the right side with Black 35.]
 ;W[me]C[White must play 36.]
 ;B[qi]C[White cannot live on the right.])
 (;B[oi]C[Black 35, the play in the game from which this variation is taken, is a mistake.]
 ;W[me])))
 (;B[oc]C[Black 19 lets White live in the corner.]
 ;W[pc]
 ;B[nc]
 ;W[mb]))
 (;W[nd]C[White 18 is a mistake.]
 ;B[me]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[md]
 ;W[mb]
 ;B[kb]LB[oe:a]C[White pushing through at 'a' and then cutting does not work. White loses the fight in the corner, so the situation is hopeless for White.]))
 (;W[of]LB[oe:B][og:A]C['a' is usual, 'b' is possible, if Black is strong.
+]
 (;B[og]
 ;W[qc]LB[rc:A][pd:B]
 (;B[rc]
 ;W[rd]LB[pd:b][qe:a][re:c]C[Black continues with 'a' to surrender the corner, or 'b' to take the right. 'c' is a mistake.]
 (;B[qe]C[Black gives away the corner for the sides.]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[re]
 ;B[rf]
 ;W[pb]
 ;B[oc])
 (;B[pd]LB[rb:B][pc:A]C[Black takes the corner and the right side.
 'a' is the only move, 'b' is wrong.
+]
 (;W[pc]LB[rb:A][re:B]C['a' or 'b' are ok.
+]
 (;B[rb]LB[nc:A][re:B]C['a' if the top side is still empty, else (e.g. in the Chinese Fuseki) 'b'.
+]
 (;W[nc]
 ;B[re]
 ;W[nf]
 ;B[pg]
 ;W[kc])
 (;AB[kc]
 ;W[re]
 ;B[qf]
 ;W[nc]
 ;B[rf]LB[qb:A][nf:B]C['a' or 'b' or ok.
+]
 (;W[qb])
 (;W[nf])))
 (;B[re]
 ;W[rb]
 ;B[sd]
 ;W[nc]))
 (;W[rb]
 ;B[pc]
 ;W[qb]LB[of:4]C[Now White 4 has been a helping move, only strengthening Black.
 ]))
 (;B[re]
 ;W[qe]
 ;B[sd]
 ;W[qf]
 ;B[pe]
 ;W[pd]
 ;B[qg]
 ;W[rd]))
 (;B[pd]
 ;W[pc]
 ;B[oe]
 ;W[nd]
 ;B[me]))
 (;B[oe]LB[ne:B][pe:A]C['a' goes for territory, 'b' for influence. 'b' is not recommended.
+]
 (;W[pe]
 ;B[ne]
 ;W[pd]
 ;B[qe]
 ;W[qc]
 ;B[rc])
 (;W[ne]
 ;B[pe]LB[nd:A][og:B]C['a' or 'b'.
+]
 (;W[nd])
 (;W[og]
 ;B[nd]))))
 (;W[]C[Playing elsewhere is bad.
+]
 ;B[ld]LB[ld:5][pf:3]C[Punishment. For continuation see the variation of Black 5 played before Black 3.
 ]))
 (;B[qf]LB[pf:A][qf:3]C[
 Ikken Biraki (1-space extension)
 Compared to Black 3 onto 'a' this move has the advantage of safety, as the Black group can no more be attacked from the lower right, and the disadvantage of renouncing influence and continuations into the center.
+]
 ;W[qc]LB[pc:b][rc:a]C[Black continues with 'a'. 'b' was once considered to be joseki, but is generally inferior.
+]
 (;B[rc]
 ;W[pc]LB[rb:A][qi:B]C['a' is usual, 'b' is possible.]
 (;B[rb]
 ;W[kc]C[
 * Joseki *])
 (;B[qi]
 ;W[rb]))
 (;B[pc]C[Black 5 looks like a trick play, and to the extent that White
 must answer carefully, it is.]
 ;W[pd]
 ;B[qb]LB[rc:a][qe:b]C[White continues with 'a'. White 'b' is not recommended. White must have the ladder to play 'b'.
+]
 (;W[rc]LB[rd:a][pe:b]C[Black continues with 'a'.
 'b' is a trick play, but really difficult to punish it.
+]
 (;B[rd]LB[pb:b][oc:a]C[White continues with 'a'. White 'b' is a mistake.
+]
 (;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[rb]LB[ic:B][kc:A]C[If White gets 'a', the result is inferior, but there's a case where Black made the right choice.
+]
 (;W[kc]TR[ob]C[White has got the triangled second line move for free, and Black has 2 points less compared to similar variations, which are joseki.
 ])
 (;AW[qm][pp]AB[kc]LB[pc:5]C[In this case, extending to the right side is not important because of the White low position in the lower right, and White cannot get his extension. So here, Black 5 was the best choice.
+]
 ;W[ic]
 ;B[ke]C[White in trouble.
 ]))
 (;W[pb]C[White 10 is a mistake.
 White can be confined to small life in the corner.]
 ;B[oc]
 ;W[rb]LB[ob:a][nc:b]C[Black continues with 'a' to confine White to the corner, or 'b'
 to string White out.]
 (;B[ob]
 ;W[qa]
 ;B[mc])
 (;B[nc]
 ;W[nd]
 ;B[mc]
 ;W[md]
 ;B[lc]LB[sd:a][ke:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sd]C[White 18 is necessary to make life in the corner.]
 ;B[ld])
 (;W[ke]C[White 18 is a mistake.]
 ;B[qa]
 ;W[ra]
 ;B[sc]CR[sb]C[White dies. White cannot block at the mark, so cannot make two eyes.]))))
 (;B[pe]LB[pb:A][oc:B][oe:C]C['c' is correct, but 'a' is not bad. If 'b', tricked.]
 (;W[pb]
 ;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[nd]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[rb]C[In some cases it's acceptable for White, but on empty board Black is favorable.])
 (;W[oc]
 ;B[pb]LB[ob:a][rd:b]C[White continues with 'a'. White 'b', attempting to capture the three Black stones, does not work.]
 (;W[ob]
 ;B[rb]
 ;W[kc]C[Bad for White])
 (;W[rd]C[White 12 is a mistake. White cannot capture the three Black corner stones.]
 ;B[qe]
 ;W[rb]
 ;B[ob]
 ;W[nb]
 ;B[nc]
 ;W[mb]
 ;B[nd]
 ;W[oe]
 ;B[nf]C[Black 21 is the tesuji that kills White in geta
 ]))
 (;W[oe]
 ;B[rb]
 ;W[pg]
 ;B[qg]
 ;W[ph]C[White can sacrifice the corner and create a nice wall])))
 (;W[qe]C[White 8 is not recommended. White must have the ladder to play this way.]
 ;B[rc]
 ;W[rd]
 ;B[qc]
 ;W[pe]
 ;B[re]
 ;W[rf]
 ;B[sd]
 (;W[qg]C[The result must be consider unfavorable to White.
 Black has a large corner. Black gets to play a ladder block.
 The four White stones do not make a good shape.])
 (;W[pg]C[If the ladder is bad for White, or if the ladder breaker can be painful, White may consider sacrifising single stone.]))))
 (;B[qg]C[
 -Space Extension = Nikken Biraki = Dukan Peollim = Chai E`r
 -------------------------------------------------------------
+]
 ;W[pf]
 ;B[qf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[qe]
 (;W[pb]LB[rb:A]C[Joseki, but in some cases it's better to start at 'a' for keeping sente.]
 ;B[qb]
 ;W[pc]
 ;B[rb]C[Black may consider tenuki]
 ;W[kc])
 (;W[rb]
 ;B[qb]
 ;W[pc]
 ;B[ra]
 ;W[pb]C[Now it's harder for Black to play tenuki]
 ;B[sb]
 ;W[kc]C[Modern joseki]))
 (;B[oc]LB[nc:a][pc:d][nd:e][pd:b][dp:c]C[
 Tsuke-Hiki = Attach to draw back
 -----------------------------------
 Black 3 is the most orthodox reply to White 2.
 White continues with 'a', 'b' or 'e'.
 White 'b' leads to the avalanche pattern, which has complex variations.
 Black has the initial choice of joseki with this pattern. The outcome is typically Black gets the corner and out on the side, White thickness.
 White may also play elsewhere ('c').
 White 'd' is sometimes played in amateur games.
 White 'e' is played by professionals who don't want an immediate
 decision which joseki shall be played.
+]
 (;W[nc]LB[ob:b][pc:a][pd:c]C[Black continues with 'a' or 'b'.
 'c' is a mistake.]
 (;B[pc]LB[md:a][nd:b][nf:c][ng:d][dp:e]C[White continues with 'a', 'b' to 'd', or plays elsewhere. 'e' if he has or easily gets the ladder.]
 (;W[md]LB[jd:d][ne:c][pe:e][qf:a][dp:b]C[Black continues with 'a', plays elsewhere ('b') (at the risk of fighting), peeps at 'c', or blocks White's extension with 'd', starting a fight.
 Black 'e' is not recommended.]
 (;B[qf]LB[gc:B][ic:A]TR[dd]C['a' is usual. 'b' only with an additional stone on the triangled position.]
 (;W[ic]C[
 * Joseki *]
 ;AB[dd]
 ;B[gc]LB[lc:B][ie:A]C[If Black approaches, White defends with 'a'.
 White may also play tenuki, if he has learned the joseki after the Black invasion on 'b'.]
 (;W[ie])
 (;B[lc]
 ;W[mb]LB[jb:B][jd:A]C['a' goes for influence, 'b' for territory.]
 (;B[jd]
 ;W[jc]
 ;B[kc]
 ;W[kb]
 ;B[lb]
 ;W[la]
 ;B[jb]
 ;W[ka]
 ;B[id]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gb]
 ;W[le]C[
 * Joseki *])
 (;B[jb]
 ;W[pe]
 ;B[qe]
 ;W[kd]
 ;B[jd]
 ;W[jc]
 ;B[kc]
 ;W[ke]
 ;B[ib]
 ;W[hc]LB[hb:A][hd:B]C['a' is usual.
 With the ladder to the right side, Black plays'b'.]
 (;B[hb]
 ;W[ie]C[
 * Joseki *])
 (;B[hd]
 ;W[id]
 ;B[ie]
 ;W[hb]LB[gb:A][le:B]C[If Black has the ladder, Black captures with 'a'.
 If he hasn't, the ladder breaker 'b' won't help him much.]
 (;B[gb]
 ;W[ha]
 ;B[je]
 ;W[he]
 ;B[gd]
 ;W[if])
 (;B[le]LB[ld:B][je:A]C[White plays 'a'. 'b' simply fails to avoid a big loss.]
 (;W[je]
 ;B[ld]C[White sacrifices the stones to the right to build center influence and has various cuts to the left, so he isn't disappointed with this result.])
 (;W[ld]
 ;B[gb]
 ;W[ha]
 ;B[je]
 ;W[he]
 ;B[gd]
 ;W[if]
 ;B[jf]
 ;W[jg]
 ;B[kf]
 ;W[lf]
 ;B[kg]
 ;W[kh]
 ;B[lg]))))))
 (;AW[dd]
 ;W[gc]
 ;B[jd]
 ;W[ng]
 ;B[jg]
 ;W[pg]
 ;B[qg]
 ;W[ph]))
 (;B[]C[Black plays elsewhere.]
 ;W[qe]LB[pd:a][re:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pd]
 ;W[pe]
 ;B[oe]
 ;W[nd]
 ;B[re]
 ;W[rf]
 ;B[rd]LB[pg:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[pg]LB[nf:a]C[If Black plays elsewhere, White is well advised to capture Black
 with 'a'.])
 (;W[qg]
 ;B[of]
 ;W[pg]LB[ng:a]C[If Black plays elsewhere, White can capture the two Black stones
 with 'a'.]))
 (;B[re]C[Black 8, crawling along the second line, is not recommended.]
 ;W[pd]
 ;B[rc]
 ;W[qf]
 ;B[rf]
 ;W[qg]))
 (;B[ne]LB[nd:a][me:c][oe:b]C[White can respond with 'a' to 'c', but White 'c' is not recommended unless the top is important.]
 (;W[nd]LB[oe:B][pe:A]
 (;B[pe]
 ;W[ic]LB[qj:a][dp:b]C[
 * Joseki *
 White continues with 'a'. Black should not play elsewhere ('b').]
 (;B[qj])
 (;B[]LB[oe:b][qj:a]C[Black plays elsewhere. White plays an extension block at 'a',
 or the pushing probe of 'b'.]
 (;W[qj]CR[qh]C[A Black extension to the marked location is a bit small. Black
 plays elsewhere again.]
 ;B[]C[Black plays elsewhere.]
 ;W[qf]
 ;B[pf]
 ;W[qg]
 ;B[qe])
 (;W[oe]LB[of:a][pf:b]C[Black continues with the fighting move of 'a', or peaceably with 'b'.]
 (;B[of]C[Black 12 is a fighting answer. Black loses the corner.]
 ;W[pf]
 ;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[pd]
 ;B[qe]
 ;W[qc]LB[rc:b][re:a]C[Black continues with 'a' and gets sente. Black 'b' gains about 13 points, but loses sente. Black 'a' is recommended during fuseki.]
 (;B[re]
 ;W[rc])
 (;B[rc]C[Black 22 gains Black about 13 points over immediately capturing the three White stones, but Black ends in gote in this variation, so this variation is not recommended.]
 ;W[qb]
 ;B[re]
 ;W[]C[White plays elsewhere.]
 ;B[rb]C[Black's priviledge.]
 ;W[ob]
 ;B[qa]
 ;W[pb]))
 (;B[pf]C[Black 12 is peaceful.]
 ;W[ng]))))
 (;B[oe]LB[pd:b][me:a]C[Black 9 is insensibly heavy. White emphasizes the top with 'a',
 or forces with 'b'.]
 (;W[me]
 ;B[pd]
 ;W[mg])
 (;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[qc]
 ;W[qf]
 ;B[nb]
 ;W[mb]
 ;B[oa]
 ;W[ph])))
 (;W[oe]
 ;B[nb]LB[mb:b][nf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nf]
 ;B[mb]
 ;W[qe]
 ;B[re]
 ;W[qg])
 (;W[mb]C[White 10 is a mistake.]
 ;B[nd]
 ;W[mc]
 ;B[of]))
 (;W[me]C[White 8 is a special strategy, playable only if White benefits from influence to the top side, as locally White suffers a signifcant loss.]
 ;B[nb]
 ;W[mb]
 ;B[nd]
 ;W[mc]
 ;B[nf]LB[hc:b][mg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mg]
 ;B[ng]
 ;W[nh]LB[mf:B][oh:A]C['a' or 'b'.]
 (;B[oh]
 ;W[ni]
 ;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[mh]
 ;B[kf]
 ;W[le]
 ;B[ph]
 ;W[pj]LB[kg:B][qh:A]C['a' is correct, 'b' is questionable.]
 (;B[qh]
 ;W[kg]C[
 * Joseki *])
 (;B[kg]
 ;W[jd]
 ;B[ki]
 ;W[og]
 ;B[oe]
 ;W[qh]
 ;B[qg]
 ;W[qi]
 ;B[rg]C[If White can extend from one of his two groups in sente, he is well.]))
 (;B[mf]
 ;W[lf]
 ;B[oh]LB[mh:A][ni:B]C['a' or 'b'.]
 (;W[mh]
 ;B[oi])
 (;W[ni]
 ;B[lg]
 ;W[mh]
 ;B[kf]
 ;W[le])))
 (;W[hc]C[White 14 is a mistake.]
 ;B[mf])))
 (;B[jd]C[Black provokes a fight.]
 ;W[qe]LB[pd:a][re:b]C['a' is correct, 'b' is not recommended.]
 (;B[pd]
 ;W[pe]
 ;B[oe]
 ;W[nd]LB[re:b][of:a]C[Black 'a' or 'b'.]
 (;B[of]LB[rd:b][re:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]
 ;B[rd]
 ;W[qh]
 ;B[mf]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[ke]
 ;B[je]LB[kd:a][lf:b]C[White continues with 'a' to take territory at top, 'b' to get out to the center.]
 (;W[kd]C[White 24 goes for territory.]
 ;B[kf]
 ;W[jc]
 ;B[ic]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gc]
 ;W[gb]
 ;B[fc]
 ;W[pj])
 (;W[lf]C[White 24 leaves White an opening to the center.]
 ;B[lg]
 ;W[kf]))
 (;W[rd]C[White 14 is a mistake.]
 ;B[rc]
 ;W[re]
 ;B[qb]
 ;W[qh]
 ;B[mf]LB[nb:a]C[White 'a' is no longer sente. The White group at top is in trouble.]))
 (;B[re]
 ;W[rf]
 ;B[rd]
 ;W[of]
 ;B[qf]
 ;W[ne]
 ;B[qg]))
 (;B[re]LB[jd:7]C[For continuation, see the variation where Black played elsewhere instead of Black 7.]))
 (;B[pe]C[If Black wants to play 7, Black should first peep. This variation presents no advantage to Black.]
 ;W[ic]
 ;B[ne]
 ;W[me]
 ;B[nb]
 ;W[mb]
 ;B[nd]
 ;W[mc]
 ;B[nf]LB[pe:7]TR[mf]C[Looking at shape, Black 7 would be better placed at the marked location.])
 (;B[lc]C[Russian joseki, invented by Dmitrij Surin, 6-dan]
 ;W[mb]
 ;B[jd]
 ;W[qe]
 ;B[pd]
 ;W[pe]
 ;B[oe]
 ;W[nd]
 ;B[re]
 ;W[rf]
 ;B[of]
 (;W[rd]
 ;B[se]
 ;W[sd]
 ;B[qf]
 ;W[sf]
 ;B[re]
 ;W[se]
 ;B[pf]
 ;W[re]
 ;B[rc]
 ;W[qg]
 ;B[rb]C[Promising fight for Black.])
 (;W[pg]C[Correct answer.]
 ;B[rd]
 ;W[mf]
 ;B[ng]
 ;W[qi]C[White is slightly ahead. He has nice forcing moves against Black's corner.]))
 (;B[kd]))
 (;W[nd]LB[kd:c][pe:b][qf:a][qg:d]TR[qj]C['a' is usual. 'b' is used for making a larger moyo on the right side, especially if Black already has a stone on or near the triangled position.
 'c' and 'd' are not recommended.
 Tenuki is another option here.]
 (;B[qf]LB[jc:A][jd:B]C['a' or 'b'.]
 (;W[jc]LB[hc:A]C[
 * Joseki *
 Later, Black may approach on 'a'.]
 ;AB[dd]
 ;B[hc]LB[je:A][dp:B]C[White jumps to 'a' or invites a Black invasion by playing tenuki 'b'.]
 (;W[je])
 (;W[dp]
 ;B[lc]LB[kd:C][ld:B][pd:A]C['a' or 'b'. 'c' is not recommended.
+]
 (;W[pd]LB[qc:A][pe:B]C['a' is correct, 'b' is questionable.]
 (;B[qc]
 ;W[ld]LB[lb:A][kc:B]C['a' or 'b'.]
 (;B[lb]
 ;W[kd]
 ;B[nb]LB[me:B][og:A]C[White 'a' or later Blck 'b'.
+]
 (;W[og])
 (;B[me]
 ;W[md]
 ;B[of]))
 (;B[kc]
 ;W[kd]
 ;B[jb]
 ;W[ib]
 ;B[ic]
 ;W[jd]
 ;B[lb]
 ;W[og]))
 (;B[pe]
 ;W[nb]
 ;B[qb]
 ;W[kc]))
 (;W[ld]LB[lb:A][kc:B]C['a' or 'b'.
+]
 (;B[lb]
 ;W[kd]
 ;B[nb]
 ;B[me]C[Later
+]
 ;W[md]
 ;B[of])
 (;B[kc]LB[jd:B][kd:A]C['a' is correct. 'b' is not recommended.]
 (;W[kd]
 ;B[jb])
 (;W[jd]
 ;B[kd]
 ;W[ke]
 ;B[lb])))
 (;W[kd]
 ;B[ld]
 ;W[le]
 ;B[lb]LB[nb:B][me:A]C[White 'a' is okay. 'b' is not recommended.
+]
 (;W[me]
 ;B[nb])
 (;W[nb]
 ;B[jb]
 ;W[ib]
 ;B[ic]
 ;W[kb]
 ;B[kc]
 ;W[ja]
 ;B[jd]
 ;W[ke]
 ;B[jb]C[White has very low chances to win the ko, so the result is advantageous for Black.
 ]))))
 (;W[jd]LB[hc:A]C[Later, Black may approach on 'a'.]
 ;AB[dd]
 ;B[hc]LB[he:A][dp:B]C[White answers on 'a' or invites an invitation by playing tenuki 'b'.]
 (;W[he]LB[fc:A][fd:B]C['a' is correct. 'b' helps White's shape.]
 (;B[fc]
 ;W[ic]
 ;B[hd]
 ;W[ie]LB[og:A]C[Later, 'a' is a good point for White.])
 (;B[fd]
 ;W[gc]
 ;B[gd]
 ;W[hd]LB[gb:A][hb:C][ic:B]C['a' is usual.]
 (;B[gb]
 ;W[ic]
 ;B[fc])
 (;B[ic]
 ;W[gb])
 (;B[hb]
 ;W[ic]
 ;B[gb])))
 (;W[dp]LB[lc:B][ld:A]C['a' is the correct invasion. 'b' is wrong.]
 (;B[ld]
 ;W[lc]
 ;B[kc]
 ;W[kd]
 ;B[lb]
 ;W[mc]
 ;B[jc]
 ;W[id]
 ;B[hd])
 (;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[kd]
 ;B[jc]
 ;W[id]))))
 (;B[pe]LB[jc:A][jd:B]C['a' or 'b'.]
 (;W[jc]LB[pd:C][qf:B][qj:A]C[
 * Joseki *
 Black wants to play 'a'. If he omits it, later White might play 'b' or 'c'.]
 (;B[qj])
 (;AW[qj]PL[W]
 ;W[qf]
 ;B[pf]
 ;W[qg]
 ;B[qe])
 (;W[pd]LB[qc:A][qf:B]
 (;B[qc]
 ;W[pf])
 (;B[qf]
 ;W[qc]
 ;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[nb]
 ;B[pa])))
 (;W[jd]))
 (;B[kd]C[Black 7 is a strange move, so close to White's solid connnection.]
 ;W[qe]LB[pd:B][re:A]C['a' secures Black. 'b' is questionable.]
 (;B[re]
 ;W[pd]
 ;B[rc]
 ;W[qf]
 ;B[rf]
 ;W[qg])
 (;B[pd]
 ;W[pe]LB[ob:B][oe:A]C[Against White there is the cut on 'a', but against Black, 'b' is sente.]
 ;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[rb]))
 (;B[qg]
 ;W[jc]
 ;W[qe]LB[re:B][rf:C][qi:A]C[Later, White presses Black down.
 White's attachment only makes Black stronger. Better to play at 'a' first and consider invasions at 'b' or 'c' later.]
 ;B[re]
 ;W[pe]
 ;B[rf]))
 (;W[nf]LB[ng:a]C[White 6 or 'a' is a special move influenced by the situation at the top. If Black has a stone close to the side handicap stone (as shown), White 6 may be a good, light move.]
 ;B[nb]LB[mc:a][qf:b]C[White continues with 'a' or 'b'.]
 (;W[mc]
 ;B[mb]
 ;W[lc]C[This sequence favors White.])
 (;W[qf]C[White switches to the right side.]
 ;B[mc]
 ;W[pj]))
 (;W[ng]LB[nd:C][qg:A][dp:B]C['a' is correct, tenuki 'b' and 'c' are mistakes.]
 (;B[qg])
 (;B[dp]
 ;W[qg]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc])
 (;B[nd]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[mc]
 ;W[nb]
 ;B[oe]
 ;W[lc]))
 (;W[]LB[jd:b][nd:a]C[White plays elsewhere.
 Black continues locally at 'a' or 'b'.]
 (;B[nd]
 ;W[mc]LB[lc:c][md:b][ne:a]C[White must have the ladder to capture Black 6 to play this way, or make a submissive move later.
 Black continues with 'a' or 'b'. 'c' is possible.]
 (;B[ne]
 ;W[jc]C[
 * Joseki *])
 (;B[md]LB[kc:c][lc:b][ld:a]C[White continues with 'a' with a favorable ladder, or 'b' or 'c' if not.]
 (;W[ld]C[White must have the ladder to play this way.]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kd]LB[kb:A][mb:B][ne:C]C['a' is correct, but depends on the ladder C. 'b' is wrong.]
 (;B[kb]
 ;W[ne])
 (;B[mb]
 ;W[nb]
 ;B[oe]
 ;W[ic]C[White 17 keeps Black in check.]
 ;B[kb]
 ;W[ma]
 ;B[ib]
 ;W[jd]LB[hb:b][jb:a]C[White 21 is the tesuji.
 Black may try 'a' or 'b'. Neither work.]
 (;B[jb]
 ;W[hb])
 (;B[hb]
 ;W[jb])))
 (;W[lc]C[White must play 9 here if White cannot capture the two Black stones at top in a ladder.]
 ;B[oe]
 ;W[ic]
 ;B[ld]
 ;W[kd]
 ;B[ke]
 ;W[jd])
 (;W[kc]
 ;B[ld]))
 (;B[lc]LB[ld:A][md:B]C['a' gives more influence than 'b'.]
 (;W[ld]
 ;B[md]
 ;W[me]
 ;B[ne]
 ;W[nf]
 ;B[oe]
 ;W[of]
 ;B[pe]
 ;W[kc]
 ;B[lb]
 ;W[kb]
 ;B[nb]
 ;W[le])
 (;W[md]
 ;B[ne]
 ;W[ld]
 ;B[kc]
 ;W[kd]
 ;B[jc])))
 (;B[jd]
 ;W[nf])))
 (;B[ob]LB[nd:a][pd:d][ne:c][oe:b]C[Black 5 was one of Kitani Minoru's favorite moves. White can answer at 'a', 'b' or 'c'. White 'd' is not recommended.]
 (;W[nd]
 ;B[pd]
 ;W[jd]C[
 * Joseki *])
 (;W[oe]LB[pd:B][pf:A]C[White 6 was an invention of Go Seigen. Black continues with 'a'. 'b' is surrounded by the opponent.
+]
 (;B[pf]C[Black 7 may have been an innovation by Fujisawa Shuko = Fujisawa Hideyuki in 1965.]
 ;W[nb]
 ;B[pd]
 ;W[me]C[
 * Joseki *])
 (;B[pd]LB[nb:B][pf:A]C['a' punishes, 'b' reverts to joseki.]
 (;W[pf]
 ;B[nb]
 ;W[mc])
 (;W[nb]
 ;B[pf]LB[jd:B][me:A]C['a' or 'b'.]
 (;W[me])
 (;W[jd]))))
 (;W[ne]C[White 6 was invented by Takagawa Kaku.]
 ;B[pd]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qf]
 ;W[pg])
 (;W[pd]C[White 6 looks like good shape, but gives White heavy shape in this instance.]
 ;B[qc]LB[nd:A][pf:B]C['a' or 'b'.]
 (;W[nd]
 ;B[pf])
 (;W[pf]LB[nd:a][qe:b]C[Black continues with the cut of 'a'. Black 'b' is too mild.]
 (;B[nd]LB[mc:B][nf:A]C['a' or 'b'.]
 (;W[nf]
 ;B[md]
 ;W[qe]C[In spite of White 12, the result favors Black.])
 (;W[mc]
 ;B[ne]
 ;W[kd]
 ;B[of]
 ;W[qe]
 ;B[pg]
 ;W[qg]
 ;B[qh]
 ;W[rh]
 ;B[ph]
 ;W[rf]
 ;B[re]
 ;W[pe]
 ;B[rd]
 ;W[qj]
 ;B[nh]))
 (;B[qe]C[Black 9 is not recommended, as it is too mild.]
 ;W[nf]
 ;B[qg]))))
 (;B[pd]LB[ob:A][oe:B]C['a' is correct. 'b' is a mistake.]
 (;W[ob]LB[pc:A][oe:B]C['a' or 'b'.]
 (;B[pc]
 ;W[nd]
 ;B[pg]
 ;W[jd])
 (;B[oe]
 ;W[pc]
 ;B[nd]
 ;W[oc]
 ;B[ne]
 ;W[qc]LB[pe:A]C[The cut at 'a' remains.]))
 (;W[oe]
 ;B[ob])))
 (;W[pd]
 ;B[pc]
 ;W[qe]LB[nc:d][qc:b][nd:c][rd:e][re:a]C[
 Avalanche = Nadare = Nunsataehyeong = Xue~beng = Lawine
 --------------------------------------------------------
 Black can respond 'a', 'b', 'c' or 'd'.
 Black 'a' is peaceful.
 'b' avoids all complications.
 'c' is the small avalanche (ko-nadare).
 Black 'd', White 'c' gives the large avalanche (oo-nadare).
 Black must have the ladder to play 'c'.
 After 'c' there are no more simplifying variations, but the small avalanche isn't too complicated.
 After 'd' there are many complications, but White still can choose a simplifying variation.
 About the large avalanche joseki, Takemiya Masaki 9P spoke to Jan van der Steen: "I will never play nadare in my life again. I don't like large scale joseki since it's complicated and it settles too much of the board. For beginners I recommend just to play the simple variation ('b')."
 Black 'e' is sometimes seen.
 e5, d4, c3, b2, a1
+]
 (;B[re]LB[rd:a][qf:b]C[Joseki continues with White 'a'. White 'b' is also possible.
 Outdated]
 (;W[rd]
 ;B[qc]
 ;W[rf]LB[nd:a][pe:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[pf]LB[ne:c][of:a][dp:b]C[
 * Joseki *
 Black continues with 'a', plays elsewhere ('b'). Black 'c' is
 not compelling.]
 (;B[of]LB[ne:c][og:a][pg:b]C[Continuation. White continues with 'a'. White 'b' is submissive.
 White 'c' is unreasonable.]
 (;W[og]LB[ne:b][ng:a]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[ng]LB[nh:b][oh:a]C[White plays safe with 'a', or strongly with 'b'.]
 (;W[oh]LB[ne:a][nh:b]C[Black continue with 'a'. Black 'b' is an overplay.]
 (;B[ne]
 ;W[nh])
 (;B[nh]
 ;W[ni]LB[ne:a][mi:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne]
 ;W[mi])
 (;B[mi]C[Black is ready to be cut up.]
 ;W[mj])))
 (;W[nh]C[White 16 is a strong way of playing.]
 ;B[pe]C[This continuation is from Sugiuchi versus Maeda, 1955.]
 ;W[oe]
 ;B[nf]
 ;W[ne]
 ;B[me]
 ;W[pe]
 ;B[pg]
 ;W[se]
 ;B[oh]
 ;W[md]
 ;B[nc]
 ;W[mf]
 ;B[le]
 ;W[mg]
 ;B[og]
 ;W[qg]
 ;B[mh]
 ;W[kf]
 ;B[ni]
 ;W[kd]
 ;B[ld]
 ;W[lc]
 ;B[mc]
 ;W[ke]
 ;B[kc]
 ;W[lb]
 ;B[jc]
 ;W[ki]))
 (;B[ne]
 ;W[ng]
 ;B[pe]C[Black should not be so concerned about two stones.]
 ;W[qf]C[White has good shape.]))
 (;W[pg]C[White 14 is submissive.]
 ;B[ne]
 ;W[pe]
 ;B[rc])
 (;W[ne]LB[md:b][me:a]C[White 14 is unreasonable. Black 13 is the vital point precisely because White 14 is impossible.
 Black continues with 'a'. White 'b' is a mistake.]
 (;B[me]
 ;W[nf]
 ;B[oe]
 ;W[pe]
 ;B[og]C[White faces a difficult fight.])
 (;B[md]C[Black 15 makes White's impossible move possible.]
 ;W[oe])))
 (;B[]C[Black plays elsewhere.]
 ;W[rc]LB[mc:a][of:b]C[Black continues with 'a' or 'b'.]
 (;B[mc])
 (;B[of]LB[nc:b][og:a]C[White continues with 'a' to emphasize the right, or 'b' to take corner profit at the expense of thickness.]
 (;W[og]
 ;B[ng]
 ;W[oh]
 ;B[ne]
 ;W[pe]LB[nc:a]C[White must connect with 20 because he is aiming at the cutting point of 'a'.]
 ;B[lc])
 (;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[pe]
 ;W[oe]
 ;B[ne]
 ;W[pe]
 ;B[pg]
 ;W[se]
 ;B[nf]C[White's corner profit exceeds Black's thickness.])))
 (;B[ne]LB[of:a][dp:b]C[White continues locally with 'a', or plays elsewhere ('b').]
 (;W[of]
 ;B[rc]LB[se:a]C[Black 15 is not urgent.
 Early in the game, White is better advised to play elsewhere
 than take at 'a'.])
 (;W[]C[White plays elswhere.]
 ;B[pe]LB[oe:b][se:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[se]
 ;B[of]
 ;W[pg])
 (;W[oe]C[White 15 is a mistake.]
 ;B[of]
 ;W[pe]
 ;B[pg]
 ;W[se]
 ;B[qg]))))
 (;B[pe]
 ;W[qf]
 ;B[nd]
 ;W[oe]LB[jc:a][ne:d][nf:c][pf:b]C[Black 11 retains potential, but it should not be played immediately.
 Black continues with 'a'.
 Black 'b' immediatley is premature, but may make sense later.
 Black 'c' is a tesuji.
 Black 'd' is meaningless.]
 (;B[jc]C[Black 15 is a good extension that retains Black 15's potential]
 ;W[of])
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[ne]
 ;B[og]
 ;W[md]
 ;B[nc]
 ;W[me]
 ;B[ph]
 ;W[qg]
 ;B[nh]
 ;W[mc]
 ;B[rc]
 ;W[qh]
 ;B[pi]
 ;W[qi]
 ;B[pj]
 ;W[se])
 (;B[nf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[ne]
 ;W[pf]
 ;B[oh])
 (;B[ne]C[Black 15 is a mistake. Black is just helping White improve his shape.]
 ;W[of]
 ;B[nf])))
 (;W[qf]C[White 8 was played by Go Seigen against Karigane Junichi on February 25, 1942.]
 ;B[nd]
 ;W[qc]
 ;B[rd]
 ;W[qb]
 ;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[ne]
 ;W[of]
 ;B[rb]
 ;W[pa]
 ;B[ob]
 ;W[mb]
 ;B[rc]
 ;W[nf]
 ;B[ld]
 ;W[lf]
 ;B[le]
 ;W[jc]))
 (;B[qc]
 ;W[nd]LB[mc:a][re:b]C[White 8 is the only move.
 Black continues with 'a' or 'b'.]
 (;B[mc]LB[pf:A][qk:B][dp:C]C['a' and 'b' make sense, tenuki 'c' can be possible.]
 (;W[pf]C[
 * Joseki *])
 (;W[qk])
 (;W[dp]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[pe]
 ;B[nf]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[ng]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[jc]
 ;W[kh]))
 (;B[re]
 ;W[qf]
 ;B[rf]LB[qg:A][qh:B]C['a' or 'b'.]
 (;W[qg]
 ;B[mc]LB[le:a][dp:b]C[White continues with 'a'. White playing elsewhere ('b') is not recommended.]
 (;W[le]
 ;B[lc]CR[nc]C[
 * Joseki *
 Black 15 is necessary to allow for a push at the red dot.])
 (;W[]C[White plays elsewhere, not recommended.]
 ;B[md]
 ;W[me]
 ;B[le]
 ;W[lf]
 ;B[ke]))
 (;W[qh]
 ;B[mc]
 ;W[le])))
 (;B[nd]LB[nc:B][qc:A]C[
 Small Avalanche = Ko-Nadare = Jakgeun Nunsataehyeong = Xiao~ Xue~beng = Kleine Lawine
 --------------------------------------------------------------------------------------
 Black must have the ladder.
 'a' is correct, 'b' is a trick play.
+]
 (;W[qc]
 ;B[rd]
 ;W[qb]LB[re:A][pf:B]C['a' is correct. Black needs the ladder to play 'b'.]
 (;B[re]LB[nc:c][pf:a][qf:b]C[White continues with 'a' to resolve the situation, or 'b' to provoke a tough fight. White must have the ladder to play 'b'.
 'c' is a game-over mistake.]
 (;W[pf]LB[pb:d][ne:c][of:b][qf:a]C[Black continues with 'a' or 'b'.
 Black takes the right with 'a', White the top.
 Black takes the corner and center, with White on the right and top sides with 'b'.
 Black takes a large corner with 'c', with White taking the right, and a group on the run.
 Black 'd' is a transposition of a variation of 'c': same result from a different order of moves.]
 (;B[qf]LB[nc:a][pe:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[pg]LB[md:a][dp:b]C[White continues by capturing Black 7 on 'a'. Playing elsewhere ('b') is not recommended.]
 (;W[md]C[
 * Joseki *])
 (;W[]CR[md]C[Omitting the capture at the marked location by playing elsewhere is not recommended.]
 ;B[md]
 ;W[me]
 ;B[mc]
 ;W[nb]
 ;B[le]
 ;W[mf]
 ;B[lf]
 ;W[mg]
 ;B[mb]
 ;W[ob]))
 (;W[pe]LB[pb:b][mc:a]C[White 14 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mc]LB[rf:b][qg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qg]
 ;B[rf]
 ;W[ph]
 ;B[rb]C[Black 19 kills White's corner stones.])
 (;W[rf]C[White 16 is a mistake.]
 ;B[qg]
 ;W[rg]
 ;B[pg]
 ;W[of]
 ;B[rh]))
 (;B[pb]C[Black 15 is slow, giving White the opportunity to make good outside shape by sacrificing the two White stones in the corner.]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[rb]
 ;W[mb]
 ;B[rc]
 ;W[qg])))
 (;B[of]LB[rf:B][pg:A]C['a' is correct, 'b' is a game-over mistake.]
 (;W[pg]
 ;B[ne]
 ;W[pe]LB[pb:A][rb:B]C['a' is correct. 'b' is a mistake.]
 (;B[pb]LB[nc:a][rc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[rb]LB[pa:b][mb:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mb]
 ;B[oa]LB[jc:A][kd:B]C['a' or 'b'.]
 (;W[jc]LB[mg:B][oi:C][pi:A]C['a' or 'b' are ok, 'c' is questionable.]
 (;B[pi])
 (;B[mg]
 ;W[pj]
 ;B[hc])
 (;B[oi]LB[og:C][oh:B][pi:A][qi:D]C[
 'a' punishes. 'b' gives an equal result. 'c' depends on the ladder. 'd' is a mistake.]
 (;W[pi]LB[oh:B][pj:A]C['a' or 'b' don't help.]
 (;B[pj]
 ;W[ng]
 ;B[og]
 ;W[oh]
 ;B[nh]
 ;W[ph]
 ;B[mg]
 ;W[ni]
 ;B[mh]
 ;W[oj])
 (;B[oh]
 ;W[pj]LB[ql:A]C[Later, Black can use the White weakness on 'a'.]
 ;B[ql]
 ;W[oj]
 ;B[ph]
 ;W[qh]
 ;B[qg]
 ;W[rg]
 ;B[qi]
 ;W[rh]
 ;B[qj]))
 (;W[oh]
 ;B[nh]
 ;W[pi]
 ;B[ni]
 ;W[pk])
 (;W[og]
 ;B[ng]
 ;W[nh]
 ;B[oh]
 ;W[mg]
 ;B[nf]
 ;W[mf]
 ;B[me]
 ;W[le]C[White 34 is unreasonable.]
 ;B[mh]
 ;W[ni]
 ;B[lf]
 ;W[lg]
 ;B[lh]
 ;W[kg]
 ;B[nj]C[Black has the ladder, so this is a loss for White.])
 (;W[qi]C[White 26 is a mistake.
 White 26 was played by Rin Kaiho against Takagawa Shukaku in the 1968 Meijin Title, game 5.
 Rin's later comment on this move: "I just don't know joseki....".]
 ;B[nh]
 ;W[qk]
 ;B[hc]
 ;W[je]
 ;B[rf]
 ;W[mf]
 ;B[og]
 ;W[ph]
 ;B[ld]
 ;W[ee]
 ;B[he]
 ;W[kf]
 ;B[le]
 ;W[ic]
 ;B[hd]
 ;W[ki]
 ;B[mi]
 ;W[qp]
 ;B[eg]
 ;W[ec]
 ;B[dd]
 ;W[fb]
 ;B[gb]
 ;W[ib]
 ;B[ed]
 ;W[nl]
 ;B[kj]
 ;W[ji]
 ;B[lj]
 ;W[eq]
 ;B[jj]
 ;W[if]
 ;B[nn]
 ;W[ll]
 ;B[ln]
 ;W[jl]
 ;B[jn]
 ;W[ij]
 ;B[ik]
 ;W[jk]
 ;B[ol]
 ;W[ok]
 ;B[nk]
 ;W[nj]
 ;B[pk]
 ;W[mk]
 ;B[pj]
 ;W[ql]
 ;B[pl]
 ;W[hk]
 ;B[qm]
 ;W[rh]
 ;B[qo]
 ;W[pp]
 ;B[po]
 ;W[il]
 ;B[mq]
 ;W[oh]
 ;B[ni]
 ;W[ng]
 ;B[mg]
 ;W[nf]
 ;B[lf]
 ;W[oe]
 ;B[lg]
 ;W[ck]
 ;B[iq]
 ;W[ch]
 ;B[gq]
 ;W[fq]
 ;B[go]
 ;W[gr]
 ;B[hr]
 ;W[gp]
 ;B[hp]
 ;W[hq]
 ;B[nr]
 ;W[or]
 ;B[gq]
 ;W[fd]
 ;B[fe]
 ;W[hq]
 ;B[bp]
 ;W[co]
 ;B[gq]
 ;W[db]
 ;B[gd]
 ;W[hq]
 ;B[rp]
 ;W[rq]
 ;B[gq]
 ;W[oo]
 ;B[on]
 ;W[hq]
 ;B[bo]
 ;W[bq]
 ;B[gq]
 ;W[bc]
 ;B[fc]
 ;W[hq]
 ;B[ii]
 ;W[hi]
 ;B[gq]
 ;W[eb]
 ;B[fp]
 ;W[cm]
 ;B[cb]
 ;W[cc]
 ;B[bb]
 ;W[ba]
 ;B[ca]
 ;W[ab]
 ;B[aa]
 ;W[ac]
 ;B[fa]
 ;W[ba]
 ;B[dn]
 ;W[cn]
 ;B[aa]
 ;W[gg]
 ;B[ea]
 ;W[bf]
 ;B[be]
 ;W[bg]
 ;B[af]
 ;W[eh]
 ;B[gl]
 ;W[fk]
 ;B[rn]
 ;W[sp]
 ;B[so]
 ;W[ro]
 ;B[km]
 ;W[lk]
 ;B[rp]
 ;W[sq]
 ;B[kg]
 ;W[jg]
 ;B[lc]
 ;W[kb]
 ;B[rl]
 ;W[rk]
 ;B[sk]
 ;W[rg]
 ;B[dg]
 ;W[dh]
 ;B[fr]
 ;W[er]
 ;B[gs]
 ;W[fn]
 ;B[cr]
 ;W[dr]
 ;B[es]
 ;W[ds]
 ;B[cq]
 ;W[br]
 ;B[dp]
 ;W[ep]
 ;B[eo]
 ;W[fs]
 ;B[qr]
 ;W[ro]
 ;B[es]
 ;W[cs]
 ;B[rp]
 ;W[qq]
 ;B[em]
 ;W[hm]
 ;B[gm]
 ;W[do]
 ;B[gn]
 ;W[el]
 ;B[fg]
 ;W[fh]
 ;B[hg]
 ;W[hf]
 ;B[gf]
 ;W[gh]
 ;B[nq]
 ;W[ro]
 ;B[sn]
 ;W[en]
 ;B[gk]
 ;W[gj]
 ;B[fl]
 ;W[dl]
 ;B[fo]
 ;W[dm]
 ;B[no]
 ;W[op]
 ;B[sj]
 ;W[rj]
 ;B[lb]
 ;W[la]
 ;B[na]
 ;W[si]
 ;B[sl]
 ;W[ma]
 ;B[fm]
 ;W[fs]
 ;B[gr]
 ;W[mm]
 ;B[pr]
 ;W[os]
 ;B[rr]
 ;W[rs]
 ;B[sr]
 ;W[ps]
 ;B[sf]
 ;W[hn]
 ;B[ho]
 ;W[in]
 ;B[io]
 ;W[mn]
 ;B[mo]
 ;W[nm]
 ;B[ns]
 ;W[qs]
 ;B[np]
 ;W[ss]
 ;B[ke]
 ;W[jf]
 ;B[kh]
 ;W[jh]
 ;B[li]
 ;W[ag]
 ;B[ae]
 ;W[om]
 ;B[pm]
 ;W[ha]
 ;B[dn]
 ;W[en]
 ;B[cg]
 ;W[ba]
 ;B[da]
 ;W[cf]
 ;B[df]
 ;W[bh]
 ;B[hb]
 ;W[ia]
 ;B[qf]
 ;W[qg]
 ;B[rp]
 ;W[pq]
 ;B[sg]
 ;W[es]
 ;B[ro]C[Black (Takagawa) wins by 1 point.])))
 (;W[kd]
 ;B[mg]))
 (;W[pa]C[White 22 is not recommended.]
 ;B[ob]
 ;W[mb]
 ;B[rc]
 ;W[jc]CR[rf]LB[pa:22]C[White lost a large ko threat at the marked location by playing White 22. White is better off without playing 22.]))
 (;W[rc]C[White 18 is a mistake, most notably played by Fujsawa Hosai against Go Seigen in 1951 in game 2 of the Special Four-Game Match.
 While White 18 may be a mistake, the moves to take advantage of it are non-obvious.]
 ;B[rf]
 ;W[nc]LB[pa:a][nb:b]C[Black continues with 'a', the vital point.
 Black 'b' is a mistake.]
 (;B[pa]C[A tesuji.]
 ;W[oa]C[A tesuji.]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[ra]C[Black captures the corner.]
 ;W[pi]
 ;B[le])
 (;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[pa]
 ;B[ob]
 ;W[rg]
 ;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[ra]C[A ko is unavoidable.])))
 (;B[rb]
 ;W[nc]
 ;B[nb]
 ;W[rc]))
 (;W[rf]
 ;B[oe]
 ;W[pe]
 ;B[pg]
 ;W[qf]
 ;B[qg]))
 (;B[ne]LB[nc:B][of:A][rf:D][pg:C]C[This move is not recommended.
 'a' and 'b' are ok, 'c' returns to joseki. 'd' is a game-over mistake.]
 (;W[of]LB[pb:A][rb:B]C['a' is correct. 'b' is a mistake.]
 (;B[pb]
 ;W[nc]LB[pa:B][nb:A]C['a' is ok, 'b' is questionable.]
 (;B[nb]
 ;W[mc]LB[mb:B][rb:A]C['a' or 'b'.]
 (;B[rb]
 ;W[mb]
 ;B[oa]CR[rf]LB[mb:20][rb:19][le:b][nf:a]C[White continues with 'a' or 'b'.
 Unlike the other variation of Black 19 onto 20, a White play at the circled spot is not sente.]
 (;W[nf]LB[ld:B][le:A][mf:C]C['a', 'b' or 'c'.]
 (;B[le]
 ;W[ld]
 ;B[mf]
 ;W[mg]
 ;B[ke]
 ;W[jc])
 (;B[ld]
 ;W[kc])
 (;B[mf]
 ;W[mg]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[jc]))
 (;W[le]
 ;B[mf]))
 (;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[nf]
 ;W[rf]
 ;B[rb]
 ;W[ng]
 ;B[lf]
 ;W[oh]))
 (;B[pa]LB[oa:B][mc:A]C['a' is ok. 'b' is only okay if White is strong on the top.]
 (;W[mc]
 ;B[rb]
 ;W[nf]LB[ld:C][le:A][mf:B]C['a' or 'b' run in bad shape. 'c' is worse.]
 (;B[le]
 ;W[ld]
 ;B[mf]
 ;W[mg]
 ;B[ke]
 ;W[jc])
 (;B[mf]
 ;W[mg]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[jc])
 (;B[ld]
 ;W[md]
 ;B[me]
 ;W[le]))
 (;W[oa]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[nf]
 ;W[rf]
 ;B[rb]
 ;W[ng]
 ;B[lf]
 ;W[oh])))
 (;B[rb]C[Mistake.]
 ;W[nc]
 ;B[nb]
 ;W[rc]LB[pb:D][sc:A][rf:C][qg:B]C[
 Punishment
 'a', 'b', 'c' or 'd' don't help.]
 (;B[sc]
 ;W[ob]
 ;B[mc]
 ;W[pb]LB[nc:A][qg:B]
 (;B[nc]
 ;W[rf])
 (;B[qg]
 ;W[nc]))
 (;B[qg]
 ;W[mc]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[sd]LB[se:B][rf:A]C['a' or 'b' don't help.]
 (;B[rf]
 ;W[mb])
 (;B[se]
 ;W[sb]
 ;B[ra]
 ;W[sc]
 ;B[oa]
 ;W[rf]))
 (;B[rf]
 ;W[mc]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[sb]
 ;B[mb]
 ;W[ra]LB[lc:A][qh:B]C['a' or 'b' don't help.]
 (;B[lc]
 ;W[qg])
 (;B[qh]
 ;W[lc]))
 (;B[pb]
 ;W[sb]
 ;B[ra]
 ;W[rf]
 ;B[qa]
 ;W[sc])))
 (;W[pg]
 ;B[of]LB[ne:13][of:15]C[Same variation as Black 15 played before Black 13.])
 (;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[pb]LB[of:A][pg:B]C['a' attacks, 'b' returns to joseki.]
 (;W[of]LB[nb:15][pb:17][mc:16][nc:14][of:18]C[Same position as White 18 and Black 17 played before White 14,
 Black 15, White 16, see there for continuation.])
 (;W[pg]
 ;B[of]LB[ne:13][of:19]C[Same variation as Black 19 played before Black 13.]))
 (;W[rf]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[pe]
 ;B[pg]
 ;W[qf]
 ;B[qg]))
 (;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[ne]
 ;W[of]LB[nb:15][pb:13][mc:16][nc:14][ne:17][of:18]C[Same variation as Black 17 and White 18 played before Black 13, White 14, Black 15, White 16, see there for continuation.]))
 (;W[qf]LB[pb:b][ne:a][rf:c]C[White must have the ladder to play this way.
 Black continues with 'a', 'b' or 'c'. If White doesn't have the ladder, 'c' punishes.]
 (;B[ne]
 ;W[of]
 ;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[rb]LB[mb:A][rf:B]C['a' or 'b'.]
 (;W[mb]
 ;B[oa]LB[jc:b][nf:a]C[White continues with 'a' or 'b'.]
 (;W[nf]
 ;B[ld]
 ;W[kc])
 (;W[jc]))
 (;W[rf]
 ;B[qa]
 ;W[nf]))
 (;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[ne]
 ;W[of]
 ;B[rb]
 ;W[rf]
 ;B[qa]
 ;W[nf])
 (;B[rf]LB[nc:A][qg:B]C[Black must have the ladder to play this way.
 'a' is joseki, 'b' is a mistake.]
 (;W[nc]LB[oe:a][qg:b]C[Black plays 'a'. 'b' is not joseki.]
 (;B[oe]
 ;W[pe]
 ;B[qg]
 ;W[pf]LB[of:A][pg:B]C['a' starts the ladder if White 12 was wrong. If White has the ladder, Black 'b'.]
 (;B[of]LB[qf:12])
 (;B[pg]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[ng]
 ;W[mf]
 ;B[nb]
 ;W[mc]
 ;B[mb]LB[ob:A][lc:B]C['a' is necessary, 'b' a mistake.]
 (;W[ob]
 ;B[lc]
 ;W[pb]
 ;B[ic]
 ;W[ld]
 ;B[md]
 ;W[oc]
 ;B[kc])
 (;W[lc]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[rc]
 ;B[ra]
 ;W[qa]
 ;B[sc]
 ;W[sb]
 ;B[sd]
 ;W[lb]
 ;B[oa])))
 (;B[qg]LB[ob:a][oe:b]C[White plays 'a' and takes swaps two stones with Black. White can save his two stones with 'b'.]
 (;W[ob]
 ;B[pe]
 ;W[pb]
 ;B[pf]C[Black 7 is now meaningless.])
 (;W[oe]
 ;B[mc]
 ;W[nb]
 ;B[md]
 ;W[nf]C[White must play 20 to avoid being squeezed.]
 ;B[jd])))
 (;W[qg]
 ;B[mc]
 ;W[rc]
 ;B[rg]
 ;W[qh]
 ;B[pb]
 ;W[rh]
 ;B[sb])))
 (;W[nc]
 ;B[oe]
 ;W[pe]
 ;B[pf]))
 (;B[pf]LB[nc:B][ne:A]C['a' if Black has the ladder, 'b' if he hasn't.]
 (;W[ne]
 ;B[md]
 ;W[rf])
 (;W[nc]
 ;B[pe]
 ;W[oe]
 ;B[ne])))
 (;W[nc]LB[mc:B][qc:A]C[White 8 is an aggresive trick play.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]LB[mc:a][pf:b]C[White may try 'a' or 'b'.]
 (;W[mc]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[ne]
 ;B[ph])
 (;W[pf]
 ;B[mc]))
 (;B[mc]C[Black 9 is a mistake.]
 ;W[qc]
 ;B[rd]
 ;W[qb]
 ;B[re]
 ;W[pf]LB[nb:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[nb]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ne])
 (;B[nb]
 ;W[rf]))))
 (;B[nc]LB[nd:a][rd:b][dp:c]C[The large avalanche if White 'a'. White 'b' or tenuki 'c' to
 avoid the complications of the large avalanche.]
 (;W[nd]LB[mc:b][md:a][rd:d][re:c]C[Black starts the large avalanche with Black 'a'. Black 'b', 'c'and 'd' avoid the avalanche joseki.]
 (;B[md]C[
 Large Avalanche = Oo-Nadare = Keun Nunsataehyeong = Da` Xiao~beng = Grosse Lawine
 ----------------------------------------------------------------------------------
+]
 ;W[qc]
 ;B[rd]
 ;W[qb]LB[rb:C][rc:A][pe:D][re:B]C[Black can continue at 'a' to 'c'.
 'c', 'b' and 'a' appeared in succession after the joseki was invented in the early Showa period (1926-1984).
 'a' is an invention of Go Seigen and still the most oftenly played move of the four.
 'd' is a modern invention and leads to a peaceful variation,which is good for White.]
 (;B[rc]LB[rb:b][mc:a]C[Black 13 was invented by Go Seigen, played first on February 2, 1957 against Takagawa. The move was considered revolutionary.
 This innovative move has transformed the large avalanche joseki, Although the variation of Go Seigen it isn't up to date anymore in the new millenium, there are other continuations who are still considered joseki.
 White continues with 'a'. White 'b' is not recommended.]
 (;W[mc]
 ;B[lc]LB[mb:b][rb:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rb]LB[mb:b][re:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[re]
 ;W[mb]
 ;B[nb]LB[lb:A][qf:B]C['a' is the traditional, 'b' the modern variation.
 In one variation 'b' is just another order of moves of 'a'.]
 (;W[lb]
 ;B[pb]LB[kc:B][qf:A]C['a' is a usual joseki. (For example it was played by Cho Chikun in game 4 of the 43th Judan title match against O Rissei Judan, and by Cho Hun Hyeong 9P against Wang Lei 8P in the 7. Samsung
 finals.) 'b' is the joseki too, it leads to a modern continuation and the old variation of Go Seigen.]
 (;W[qf]LB[ld:A][me:B][ne:E][of:D][rf:C]C['a' and 'b' are joseki, although 'b' gives an empty triangle.
 'c' is just another order of the moves after 'b'.
 'd' and 'e' are possible.]
 (;B[ld]LB[pa:A][rf:B]C['a' is joseki, 'b' is not recommended.]
 (;W[pa]
 ;B[oa]
 ;W[rf]LB[kb:A][sb:B]C['a' is joseki, 'b' is a risky variation.]
 (;B[kb]
 ;W[sc]LB[ne:A]C[White captured the right, Black the top.
 Later, 'a' is sente for Black.]
 ;B[mf])
 (;B[sb]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[jd]
 ;W[ic]
 ;B[of]
 ;W[ne]
 ;B[mf]
 ;W[nf]
 ;B[ng]
 ;W[og]
 ;B[oh]
 ;W[pg]
 ;B[nh]
 ;W[qj]LB[ra:A]C[White can start an approach ko on A, so the result is risky for
 Black.]))
 (;W[rf]
 ;B[sb]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[jd]
 ;W[ic]
 ;B[of]C[Black is better.]))
 (;B[me]LB[pa:C][kc:B][of:A]C['a' is correct. 'b' is a mistake. 'c'.]
 (;W[of]LB[kc:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[kc]
 ;B[qg]
 ;W[pg]
 ;B[qh]LB[mf:A][pi:B]C['a' is joseki, 'b' is an old variation, which is considered a mistake today.]
 (;W[mf]LB[ke:C][le:A][lf:B]C['a' is correct. 'b' is a mistake.]
 (;B[le]LB[hc:A][jd:B]C['a' is usual, 'b' is also possible.]
 (;W[hc]LB[id:B][kd:D][je:E][lf:A][mg:C]C['a' is correct.
 'b'
 'c' is a mistake.
 'd', 'e' have been played by professionals.]
 (;B[lf]
 ;W[mg]
 ;B[lg]LB[mh:A][ph:C][mi:B]C['a' or 'b' or 'c'.]
 (;W[mh]
 ;B[lh]
 ;W[ph]
 ;B[qi]
 ;W[mj]
 ;B[mi]
 ;W[ni]
 ;B[li]
 ;W[nj])
 (;W[mi]LB[lh:A][mh:B]C['a' or 'b'.]
 (;B[lh]
 ;W[ph]
 ;B[qi])
 (;B[mh]
 ;W[nh]
 ;B[lh]
 ;W[ph]
 ;B[qj]))
 (;W[ph]LB[mh:B][qi:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[qi]
 ;W[mi]
 ;B[mh]
 ;W[nh]
 ;B[lh])
 (;B[mh]
 ;W[nh]
 ;B[mi]
 ;W[qi]
 ;B[ri]
 ;W[rj])))
 (;B[id]LB[oa:A][ic:D][jc:C][lf:B]C['a', 'b' and 'c' are joseki, but with 'a' White must be careful
 about ko fighting, 'd' is a mistake, loses points.]
 (;W[oa]
 ;B[pa]LB[na:A][ic:B]C['a' or 'b'.]
 (;W[na]
 ;B[ra]C[The next White move is unnecessary according to some professionals.]
 ;W[sb]C[Game continuation between O Rissei and Cho Chikun,]
 ;B[sc]
 ;W[ma]
 ;B[qa]
 ;W[ic]
 ;B[kd]
 ;W[jc]
 ;B[kg]
 ;W[ph]
 ;B[pi]LB[mg:A][oi:B]C['a' is good, 'b' helps Black.]
 (;W[mg]
 ;B[oi]
 ;W[mi]LB[qi:A]C[Aji for White on 'a'.])
 (;W[oi]
 ;B[pj]
 ;W[oj]
 ;B[pk]LB[mg:A][dp:B]C['a' is correct. 'b' is a mistake.]
 (;W[mg])
 (;W[dp]
 ;B[nh]
 ;W[oh]
 ;B[nf])))
 (;W[ic]
 ;B[kd]
 ;W[ld]
 ;B[ne]
 ;W[oe]
 ;B[lc]
 ;W[na]
 ;B[ra]
 ;W[ld]LB[lf:A][mg:B]C['a' is correct. 'b' is a mistake.]
 (;B[lf]
 ;W[mg]
 ;B[lg]
 ;W[ph]
 ;B[lc]
 ;W[jc]
 ;B[qi]
 ;W[mi]
 ;B[mh]
 ;W[nh]
 ;B[lh]
 ;W[ni])
 (;B[mg]
 ;W[nf]
 ;B[lf]
 ;W[lg]
 ;B[kg]
 ;W[lh]
 ;B[lc]
 ;W[ma]
 ;B[sb]
 ;W[kh]
 ;B[jc]
 ;W[ld]
 ;B[kb]
 ;W[lc]LB[jb:A][je:B]C[Neither 'a' nor 'b' help Black.]
 (;B[jb]
 ;W[ke])
 (;B[je]
 ;W[jb]))))
 (;W[lf]LB[ke:A][kf:B]C['a' is correct. 'b' is a mistake.]
 (;B[ke]
 ;W[kf]LB[je:A][jf:B]
 (;B[je]
 ;W[ic]
 ;B[jf]
 ;W[jg]
 ;B[ig]
 ;W[jh]
 ;B[ih]
 ;W[ji]
 ;B[ii]
 ;W[jj]
 ;B[hk])
 (;B[jf]
 ;W[jg]LB[jb:A][je:C][if:B]C['a' is correct, 'b' and 'c' are slow.]
 (;B[jb]LB[oa:B][je:A]C['a' is correct, 'b' is disadvantageous.]
 (;W[je]
 ;B[jd]
 ;W[if]
 ;B[kb])
 (;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]
 ;B[sb]LB[jc:A][je:B]C['a' or 'b'.]
 (;W[jc]
 ;B[ic]
 ;W[ib]
 ;B[ig]LB[gb:B][je:A]
 (;W[je]
 ;B[jd]
 ;W[if]
 ;B[kb]
 ;W[ld]
 ;B[kd]
 ;W[lc]
 ;B[hb])
 (;W[gb]
 ;B[jh]
 ;W[je]
 ;B[kg]
 ;W[jd]
 ;B[ne]
 ;W[oe]
 ;B[nf]))
 (;W[je]
 ;B[jd]
 ;W[if]
 ;B[kb])))
 (;B[if]
 ;W[ic]
 ;B[ig]
 ;W[jh]
 ;B[ih]
 ;W[ji]
 ;B[hj])
 (;B[je]
 ;W[ic]
 ;B[ig]
 ;W[jh]
 ;B[ih]
 ;W[ji]
 ;B[ii]
 ;W[jj]
 ;B[hk])))
 (;B[kf]
 ;W[ke]
 ;B[kd]
 ;W[je]
 ;B[jd]
 ;W[ld]
 ;B[ne]
 ;W[oe]
 ;B[lc]
 ;W[pa]
 ;B[oa]
 ;W[ld]))
 (;W[jc]
 ;B[lf]
 ;W[mg]
 ;B[lg]
 ;W[mi]
 ;B[lh]
 ;W[ph]
 ;B[qi])
 (;W[ic]LB[kd:B][mg:A]
 (;B[mg]LB[oa:C][lf:B][nf:A]
 (;W[nf]
 ;B[lf])
 (;W[lf]
 ;B[ne]
 ;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[nh]
 ;W[og]
 ;B[ke]C[One White group will die.])
 (;W[oa]LB[pa:B][nf:A]C['a' or 'b'.]
 (;B[nf]
 ;W[na]
 ;B[oe]
 ;W[pa]
 ;B[ne])
 (;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]
 ;B[sb]
 ;W[lf]
 ;B[ne]LB[oe:B][nf:A]C['a' is correct. 'b' is a mistake.]
 (;W[nf]
 ;B[oe]
 ;W[kf])
 (;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[nh]
 ;W[og]
 ;B[ke]))))
 (;B[kd]LB[jc:B][ld:A]
 (;W[ld]
 ;B[mg]
 ;W[lf]
 ;B[lc]
 ;W[ne]
 ;B[ke]
 ;W[jc]
 ;B[jg])
 (;W[jc]
 ;B[mg]LB[oa:B][nf:A]C['a' leads to a fight, 'b' to a peaceful result, but in both cases, Black is happy.]
 (;W[nf]
 ;B[lf]
 ;W[pi]LB[kh:A][ph:B]C['a' is correct. 'b' is a mistake.]
 (;B[kh]
 ;W[ph])
 (;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[oj]
 ;W[lh]))
 (;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]
 ;B[sb]
 ;W[lf]
 ;B[ne]LB[oe:B][nf:A]C['a' or 'b'.]
 (;W[nf]
 ;B[oe])
 (;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[nh]
 ;W[og]))))))
 (;B[mg]
 ;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]
 ;B[sb]
 ;W[lf]
 ;B[ne]
 ;W[nf]
 ;B[oe]
 ;W[ke])
 (;B[kd]
 ;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[jc]
 ;B[lg]
 ;W[sb]
 ;B[sc]
 ;W[ma]
 ;B[qa]
 ;W[nf]
 ;B[lf]
 ;W[pi]
 ;B[nh]
 ;W[oj]
 ;B[nj]
 ;W[ok]
 ;B[nk]
 ;W[ol]
 ;B[mm]
 ;W[on]
 ;B[rj])
 (;B[je]
 ;W[oa]
 ;B[pa]
 ;W[mg]
 ;B[ne]
 ;W[oe]
 ;B[kg]
 ;W[na]
 ;B[ra]
 ;W[ph]
 ;B[pi]
 ;W[oi]
 ;B[pj]
 ;W[oj]
 ;B[pk]
 ;W[kd]
 ;B[ke]))
 (;W[jd]
 ;B[lf]
 ;W[mg]
 ;B[lg]
 ;W[mi]
 ;B[lh]
 ;W[ph]))
 (;B[lf]LB[oa:B][mg:A]
 (;W[mg]LB[ke:A][ne:B]
 (;B[ke]
 ;W[hc]
 ;B[lg]
 ;W[ld]
 ;B[le]
 ;W[mi]
 ;B[lh]
 ;W[ph]
 ;B[qi])
 (;B[ne]
 ;W[oe]
 ;B[ke]
 ;W[hc]
 ;B[lg]
 ;W[ld]
 ;B[le]
 ;W[mi]
 ;B[mh]
 ;W[nh]
 ;B[lh]
 ;W[nj]
 ;B[kj]
 ;W[ph]
 ;B[qj]))
 (;W[oa]LB[pa:A][nf:B]C[Neither 'a' nor 'b' help.]
 (;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]
 ;B[sb]
 ;W[le]
 ;B[ld]
 ;W[ke]
 ;B[nf]
 ;W[mg]LB[ne:B][oe:A]C['a' or 'b'.]
 (;B[oe]
 ;W[ng]
 ;B[ne]
 ;W[kd]
 ;B[pe]
 ;W[kg]C[White will first play an extension if this is sente.])
 (;B[ne]
 ;W[ng]
 ;B[oe]
 ;W[kd]
 ;B[pe]))
 (;B[nf]
 ;W[na]
 ;B[oe]
 ;W[pa]
 ;B[pe]
 ;W[ob]
 ;B[pf])))
 (;B[ke]
 ;W[hc]LB[lf:A][mg:B]C['a' is correct. 'b' is a mistake.]
 (;B[lf]
 ;W[mg]LB[lg:A][kh:B]
 (;B[lg]
 ;W[ld]
 ;B[le]LB[ph:B][mi:A]
 (;W[mi]LB[lh:A][li:B]
 (;B[lh]
 ;W[ph]
 ;B[qi])
 (;B[li]
 ;W[lj]
 ;B[lh]
 ;W[mj]
 ;B[ne]
 ;W[oe]
 ;B[oh]
 ;W[oi]
 ;B[ph]
 ;W[og]
 ;B[kj]
 ;W[kk]
 ;B[jj]
 ;W[jk]
 ;B[ij]))
 (;W[ph]
 ;B[qi]
 ;W[mi]
 ;B[mh]
 ;W[nh]
 ;B[lh]))
 (;B[kh]
 ;W[mi]))
 (;B[mg]
 ;W[lf]
 ;B[ne]
 ;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[nh]
 ;W[og]
 ;B[kd]
 ;W[mh]
 ;B[jc]
 ;W[ld]
 ;B[le]
 ;W[jb]
 ;B[lc]
 ;W[kb]
 ;B[lg]
 ;W[kf]
 ;B[jf]
 ;W[kg]
 ;B[lh]
 ;W[jg]
 ;B[ie]
 ;W[if]
 ;B[hf]
 ;W[je]
 ;B[jd]
 ;W[he]
 ;B[jf]
 ;W[li]
 ;B[hd]
 ;W[kh])))
 (;W[pi]
 ;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[nh]LB[nf:A][oj:B]C['a' or 'b'.]
 (;B[nf]LB[oe:A]C[A threat to capture three White stones on 'a'.])
 (;B[oj]
 ;W[mi]
 ;B[nf]
 ;W[oe]
 ;B[ke]
 ;W[hc]LB[he:B][jh:A]C['a' or 'b'.]
 (;B[jh])
 (;B[he]))))
 (;B[kc]LB[kb:B][sb:A]C['a' or 'b'.]
 (;W[sb]LB[kb:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[rg]
 ;B[qg]
 ;W[rh]LB[qh:A][qi:B]C['a' depends on a ladder, 'b' doesn't.]
 (;B[qh]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[ng]
 ;W[ph]
 ;B[pg]
 ;W[og]
 ;B[oh]
 ;W[pf]
 ;B[ph]
 ;W[nf]
 ;B[mf]
 ;W[nh]LB[ne:B][mg:A]C['a' depends on the ladder, else 'b'..]
 (;B[mg]
 ;W[pj])
 (;B[ne]LB[mg:B][pj:A]C['a' is correct. 'b' is a mistake.]
 (;W[pj]
 ;B[oe]
 ;W[oi]
 ;B[pe])
 (;W[mg]
 ;B[oe])))
 (;B[qi]
 ;W[oh]
 ;B[pg]
 ;W[og]LB[oi:A][ri:B]C['a' or 'b'.]
 (;B[oi]
 ;W[ri]
 ;B[rj]
 ;W[mg]
 ;B[qk]
 ;W[sc]
 ;B[qo]C[This move depends on the lower right corner. If approaching it isn't possible, the variation doesn't work well for Black.]
 ;W[kb]
 ;B[jb]
 ;W[jc]
 ;B[jd]
 ;W[ic]
 ;B[ib]
 ;W[hb]
 ;B[hc]
 ;W[id]
 ;B[gb]
 ;W[hd]
 ;B[gc]
 ;W[ja]
 ;B[ha]
 ;W[ld]
 ;B[kd]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[je]
 ;W[kf]
 ;B[jf]
 ;W[kg]
 ;B[jg])
 (;B[ri]
 ;W[qh]
 ;B[sh]
 ;W[ph]
 ;B[sg]
 ;W[sf]
 ;B[se]
 ;W[sc]
 ;B[si]
 ;W[ql]
 ;B[pk]
 ;W[ok]
 ;B[pl]
 ;W[qj]
 ;B[pj]
 ;W[sd]
 ;B[qm]
 ;W[sf])))
 (;B[kb]
 ;W[qh]))
 (;W[kb]LB[jb:B][jc:A]C['a' or 'b'.]
 (;B[jc]
 ;W[sb]
 ;B[jb])
 (;B[jb]
 ;W[jc]
 ;B[jd]
 ;W[ic]
 ;B[ib]
 ;W[hb]
 ;B[hc]
 ;W[id]
 ;B[gb]
 ;W[hd]
 ;B[gc]
 ;W[ja]
 ;B[ha]LB[oa:B][ld:A]C['a' gives White more influence than 'b'.]
 (;W[ld]
 ;B[kd]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[je]
 ;W[kf]
 ;B[jf]
 ;W[kg]
 ;B[mg]
 ;W[jg]
 ;B[if]
 ;W[ig]
 ;B[hf]
 ;W[oa]
 ;B[na]
 ;W[mh]
 ;B[ng]
 ;W[oh]
 ;B[pe]
 ;W[nf]
 ;B[mf]
 ;W[og]
 ;B[lh]
 ;W[nh]
 ;B[lg]
 ;W[li]
 ;B[kh]
 ;W[hg]
 ;B[ma]
 ;W[ki]
 ;B[jh]
 ;W[ii]
 ;B[ji]
 ;W[jj]
 ;B[ka]
 ;W[ij])
 (;W[oa]
 ;B[na]
 ;W[lf]
 ;B[ld]
 ;W[mf]
 ;B[je]
 ;W[pa]
 ;B[ma]
 ;W[rf])))))
 (;W[kc]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg]LB[sc:B][og:A]
 (;W[og]
 ;B[qg])
 (;W[sc]
 ;B[qg]
 ;W[oa]
 ;B[og]
 ;W[nf]
 ;B[mg]
 ;W[na]
 ;B[ng]
 ;W[pa]))
 (;W[pa]
 ;B[oa]
 ;W[rf]
 ;B[sb]
 ;W[kc]))
 (;B[rf]
 ;W[kc]
 ;B[me]
 ;W[of]
 ;B[qg]C[Just another order of moves.])
 (;B[of]LB[pa:B][kc:C][ne:A]C['a', 'b' are correct, 'c' is disadavantageous.]
 (;W[ne]LB[ld:A][rf:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[ld]LB[pa:A][kc:B]C['a' is correct. 'b' is disadvantageous.]
 (;W[pa]
 ;B[oa]
 ;W[rf]LB[kb:B][sb:A]C['a' or 'b'.]
 (;B[sb]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[mf]
 ;W[nf]
 ;B[ng]LB[me:B][og:A]C['a' or 'b'.]
 (;W[og]
 ;B[me]
 ;W[pf]
 ;B[oh]
 ;W[pg]
 ;B[nh]
 ;W[qi]LB[hc:A][hd:B]C[Black can continue on 'a' or 'b'.])
 (;W[me]
 ;B[lf]
 ;W[og]
 ;B[le]
 ;W[nh]
 ;B[mg]
 ;W[pf]
 ;B[oh]
 ;W[pg]
 ;B[hc]
 ;W[ni]
 ;B[hd]
 ;W[sc]
 ;B[sd]
 ;W[ra]
 ;B[qa]
 ;W[jd]
 ;B[ie]
 ;W[pa]
 ;B[je]))
 (;B[kb]
 ;W[sc]LB[nf:A][pj:B]C[Later, White has a continuation on A, aiming for an extension around 'b'.]))
 (;W[kc]
 ;B[rf]
 ;W[nf]
 ;B[ke]
 ;W[kd]
 ;B[le]LB[id:B][qg:A]C['a' is correct, 'b' is slack.]
 (;W[qg]LB[ic:B][id:A]C['a' or 'b'.]
 (;B[id]
 ;W[jb]
 ;B[ib]
 ;W[oa]
 ;B[pa]
 ;W[ic]
 ;B[hc]
 ;W[hb]
 ;B[jc]
 ;W[jd]
 ;B[je]
 ;W[ic]
 ;B[ng]
 ;W[ia]
 ;B[og])
 (;B[ic]
 ;W[id]
 ;B[jd]
 ;W[jc]
 ;B[je]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gc]
 ;W[gb]
 ;B[fc]
 ;W[fb]
 ;B[ec]
 ;W[rg]
 ;B[sb]))
 (;W[id]
 ;B[qg]
 ;W[je])))
 (;B[rf]
 ;W[kc]
 ;B[ld]
 ;W[kd]
 ;B[le]
 ;W[qg]
 ;B[ke]
 ;W[id]
 ;B[je]
 ;W[hc]LB[nf:A][rg:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[nf]
 ;W[pe]LB[rg:A][pj:B]C['a' or 'b'.]
 (;B[rg]
 ;W[qh]
 ;B[oj]
 ;W[qj]
 ;B[ol])
 (;B[pj]
 ;W[oh]
 ;B[ni]
 ;W[nh]
 ;B[mh]
 ;W[mg]
 ;B[mi]
 ;W[mf]
 ;B[kh]
 ;W[oi]
 ;B[oj]
 ;W[sb]
 ;B[qa]
 ;W[rg]
 ;B[ra]
 ;W[qi]
 ;B[qj]
 ;W[ri]))
 (;B[rg]
 ;W[nf]
 ;B[qh]
 ;W[nh])))
 (;W[pa]
 ;B[oa]
 ;W[rf]
 ;B[sb]LB[kc:A][ne:B]C['a' is correct. 'b' is a mistake.]
 (;W[kc]
 ;B[me]
 ;W[pe]
 ;B[ke]
 ;W[hc])
 (;W[ne]LB[kc:A][ld:B]C['a' is correct. 'b' is a mistake.]
 (;B[kc]
 ;W[nf]
 ;B[le])
 (;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[mf]
 ;W[nf]
 ;B[ng]
 ;W[me]
 ;B[lf]
 ;W[og]
 ;B[le]
 ;W[nh]
 ;B[mg]
 ;W[pf]
 ;B[oh]
 ;W[pg]
 ;B[oi])))
 (;W[kc]LB[ld:B][me:A]C['a' is correct, 'b' is questionable.]
 (;B[me]LB[pa:B][pe:A]C['a' is correct, 'b' is disadvantageous.]
 (;W[pe]LB[sb:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[ke]
 ;W[hc]
 ;B[mh]
 ;W[pk]C[good for White])
 (;B[sb]
 ;W[ph]))
 (;W[pa]
 ;B[oa]
 ;W[pe]LB[ra:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[qg]
 ;B[sb]
 ;W[pi]
 ;B[je]
 ;W[hc])
 (;B[ra]
 ;W[rf]
 ;B[sb]
 ;W[pi])))
 (;B[ld]LB[pa:A][kd:B]C['a' is correct. 'b' is a mistake.]
 (;W[pa]
 ;B[oa]
 ;W[rf]
 ;B[sb]LB[ne:B][pe:A]C['a' is correct, 'b' is disadavantageous.]
 (;W[pe]
 ;B[mf]
 ;W[kd]
 ;B[ke]
 ;W[je]
 ;B[kf]
 ;W[id]
 ;B[pi]
 ;W[ra]
 ;B[qa]
 ;W[ng]
 ;B[nf])
 (;W[ne]
 ;B[kd]
 ;W[jc]
 ;B[jd]
 ;W[ic]
 ;B[id]
 ;W[hd]
 ;B[he]
 ;W[gd]
 ;B[nf]
 ;W[me]
 ;B[lf]
 ;W[mf]
 ;B[mg]
 ;W[pe]
 ;B[kg]
 ;W[lh]
 ;B[lg]
 ;W[qi]))
 (;W[kd]
 ;B[mf]
 ;W[pe]
 ;B[rf]
 ;W[qg]
 ;B[ke]
 ;W[je]
 ;B[kf]
 ;W[id]
 ;B[pj]
 ;W[ng]
 ;B[ni]
 ;W[nh]
 ;B[mi]
 ;W[lg]
 ;B[mg]
 ;W[mh]
 ;B[lh]
 ;W[nf]
 ;B[ne]
 ;W[oe]C[Black lost the game.]))))
 (;B[ne]LB[me:C][pe:A][of:B]C['a' is correct. 'b' and 'c' are mistakes.]
 (;W[pe]LB[ld:B][rf:A]
 ;B[rf]LB[kc:A][ld:B]C['a' or 'b'.]
 (;W[kc]
 ;B[ld]
 ;W[kd]
 ;B[qg]
 ;W[pg]
 ;B[ke]
 ;W[qh]
 ;B[rg]LB[oa:A][je:B]C['a' is correct, 'b' is disadavantageous.]
 (;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[ma]LB[kb:B][sb:A]C['a' is correct, 'b' is a desperate attempt, to keep control on the center.]
 (;B[sb]
 ;W[je]
 ;B[lf]
 ;W[jf]
 ;B[lh]
 ;W[oi]C[End of joseki.]
 ;B[jd]C[This cut does not work.]
 ;W[id]
 ;B[jc]
 ;W[kb]
 ;B[ic]
 ;W[hc]
 ;B[hd]
 ;W[ie]
 ;B[hb]
 ;W[gc]
 ;B[ib]
 ;W[gb])
 (;B[kb]
 ;W[jb]
 ;B[lf]
 ;W[ka]
 ;B[sb]
 ;W[oi]
 ;B[li]
 ;W[pm]))
 (;W[je]
 ;B[lf]LB[id:B][jf:A]
 (;W[jf]
 ;B[lh]
 ;W[oi]
 ;B[jd]
 ;W[jc]
 ;B[id]
 ;W[ic]
 ;B[hd]
 ;W[hc]
 ;B[gd]
 ;W[fc]
 ;B[fd]
 ;W[ec])
 (;W[id]
 ;B[ph]
 ;W[og]
 ;B[pi]
 ;W[nh]
 ;B[jf]
 ;W[if]
 ;B[jg]
 ;W[nj]
 ;B[pk])))
 (;W[ld]
 ;B[me]
 ;W[kc]
 ;B[qg]
 ;W[pg]
 ;B[qh]
 ;W[ph]
 ;B[pi]
 ;W[nh]
 ;B[oi]
 ;W[ng]))
 (;W[of]
 ;B[rf]LB[kc:B][oe:A]
 (;W[oe]
 ;B[kc]
 ;W[ld]
 ;B[me]
 ;W[lf]
 ;B[kb]
 ;W[le]
 ;B[qg])
 (;W[kc]
 ;B[oe]
 ;W[pe]
 ;B[qg]
 ;W[pf]
 ;B[me]))
 (;W[me]
 ;B[ld]
 ;W[nf]
 ;B[le]
 ;W[mf]LB[kb:A][rf:B]
 (;B[kb]
 ;W[pa]
 ;B[oa]
 ;W[rf]
 ;B[lf]
 ;W[sc]LB[lg:B][mg:A]
 (;B[mg]
 ;W[of]C[Black's influence is superior.])
 (;B[lg]))
 (;B[rf]
 ;W[qg]LB[kb:B][lf:A]C['a' or 'b'.]
 (;B[lf]
 ;W[kc]
 ;B[lg]LB[ic:B][oe:A]C[Now, White can remove only one weakness 'a' or 'b'.]
 (;W[oe]
 ;B[ic])
 (;W[ic]
 ;B[of]
 ;W[pe]
 ;B[ng]))
 (;B[lf]
 ;W[kc]
 ;B[lg]LB[ic:B][of:A]C[Black is better, because he continue on 'a' or 'b'.])
 (;B[kb]
 ;W[lf])))))
 (;W[kc]LB[ld:b][me:a]C[Black continues with 'a'. Black 'b' is heavy and reduces Black's liberties.]
 (;B[me]
 ;W[of]
 ;B[qf]
 ;W[nf]LB[ke:B][mf:A]C[Black continues with 'a'. Black 'b' is the continuation of Go Seigen, but is too slow for professional players nowadays.]
 (;B[mf]LB[oa:c][mg:a][nh:b]C[Black 27 is a relatively recent development, first appearing professionally in 1968.
 White 'a' to 'c' are possible continuations.]
 (;W[mg]
 ;B[lg]
 ;W[mh]
 ;B[lh]
 ;W[mi]
 ;B[li]
 ;W[mj]
 ;B[ic]C[If Black has support in the top-left corner, which is usually the case in Black choosing this joseki, Black 35 serves as both a check and an extension from the top-left corner.]
 ;W[ke]
 ;B[kf]LB[qh:A]C[A is now a good point for White.])
 (;W[nh]C[This variation shows the sequence when Black 27 was first played professionally; Black responds with 28.]
 ;B[mh]
 ;W[ni]
 ;B[mi]
 ;W[nj]
 ;B[ic]
 ;W[ke]
 ;B[ie]
 ;W[kg]
 ;B[ki])
 (;W[oa]C[White 28 initiates an exchange whereby White gains influence, Black profit.]
 ;B[pa]
 ;W[na]
 ;B[ra]LB[ma:a][sb:c][mg:b]C[White continues with 'a', 'b' or 'c'.]
 (;W[ma]
 ;B[sb]
 ;W[mg]
 ;B[lg]
 ;W[lh]
 ;B[ng]
 ;W[mh]
 ;B[ne]
 ;W[lf]
 ;B[oe]
 ;W[kg])
 (;W[mg]
 ;B[lg]
 ;W[lh]
 ;B[mh]
 ;W[ng]
 ;B[kh]LB[lf:b][li:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[li]
 ;B[kf]LB[hc:B][mi:A]
 (;W[mi]
 ;B[ic])
 (;W[hc]C[White cannot afford to play 40 here.]
 ;B[mi]C[Black 41 initiates a sequence where White's position on the top-right falls apart.]))
 (;W[lf]C[White 38 gives Black a ponnuki in the center of the board. Normally this would be to Black's advantage.]
 ;B[li]
 ;W[kf]))
 (;W[sb]
 ;B[sc]
 ;W[ma]
 ;B[qa]
 ;W[mg]
 ;B[lg]
 ;W[lh]LB[ng:A][mh:B]
 (;B[ng]
 ;W[mh]
 ;B[ne]
 ;W[kg]
 ;B[oe]
 ;W[lf])
 (;B[mh]
 ;W[ng]
 ;B[kh]LB[lf:B][li:A]C['a' is correct, 'b' is disadvantageous.]
 (;W[li]
 ;B[kf]
 ;W[mi]
 ;B[ic]
 ;W[jd]
 ;B[id]
 ;W[je]
 ;B[ki])
 (;W[lf]
 ;B[li]
 ;W[kg]
 ;B[lh]
 ;W[le])))))
 (;B[ke]LB[oa:b][pa:c][hc:a][sc:d][id:f][ke:27][lg:e]C[Black 27 is considered a thank-you move; one reason that this variation is avoided nowadays.
 White continues with 'a'. Contesting the corner with 'b' is futile.
 White 'c' attempts to win by ko. White 'd' is another attempt at mischief.
 'e' and 'f' are special strategies.]
 (;W[hc]LB[lg:a][ph:b]C[Black continues with 'a'. Black 'b' is possible.]
 (;B[lg]LB[lg:29][ni:c][oi:a][pi:b]C[Black 29 is also too slow and a reason against this variation.
 White continues with 'a'.
 White 'b' is a strong move with potential for trouble (for both players); White does not necessarily come out well.
 White 'c' is a mistake.]
 (;W[oi]
 ;B[qi]LB[mi:A][ok:B]
 (;W[mi]
 ;B[ki])
 (;W[ok]))
 (;W[pi]CR[rg]LB[nh:b][oh:a]C[White aims for the marked location, but Black can fight back.
 Both players must proceed with care.
 Black 'a' preceeded the development of 'b'. Black 'b' is more common now.]
 (;B[oh]LB[sc:b][qg:a][ph:c]C[Black attacks to sever the link.
 White continues with 'a'. White 'b' is less favorable. White 'c' has been played professionally.]
 (;W[qg]
 ;B[pg]LB[sc:a][pf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sc]
 ;B[qa]
 ;W[pf]
 ;B[pe]
 ;W[rf]
 ;B[qe]
 ;W[rg]
 ;B[ra]
 ;W[ni]LB[ph:b][oi:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[oi]
 ;W[oj]
 ;B[nh]
 ;W[ph]
 ;B[nj]
 ;W[og]
 ;B[ok]
 ;W[pj]
 ;B[mi]
 ;W[nk])
 (;B[ph]C[Black 43 is not recommended, as it gives White favorable thickness.]
 ;W[nh]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri]))
 (;W[pf]C[White 34 is a mistake.]
 ;B[pe]
 ;W[sc]
 ;B[og]C[Black can capture the six White stones.]))
 (;W[sc]
 ;B[qa]
 ;W[ph]LB[pg:b][rg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rg]
 ;W[pg]C[White 36 is necessary. The exchange of White 32, Black 33 favors Black.])
 (;B[pg]
 ;W[og]
 ;B[nh]
 ;W[qg]
 ;B[pf]
 ;W[rf]
 ;B[pe]
 ;W[oe]
 ;B[qe]
 ;W[se]))
 (;W[ph]LB[og:a][pg:b]C[White 32 is in hopes of Black 'b'. Black 'a' is fierce.]
 (;B[og]C[Black 33 a strong move.]
 ;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[pg]
 ;B[pf]
 ;W[ma]
 ;B[sb]
 ;W[mf]
 ;B[lf]
 ;W[ld]
 ;B[le]
 ;W[ni]
 ;B[ne]LB[nh:a][oi:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nh]
 ;B[oe]C[White next plays elsewhere.])
 (;W[oi]
 ;B[mg]
 ;W[ng]
 ;B[oe]
 ;W[nh]))
 (;B[pg]
 ;W[sc]C[Now White has advantage in taking the five Black stones at top.])))
 (;B[nh]C[Black 31 builds thickness while lightly attacking the weak connection of White's large knight's move.]
 ;W[oh]
 ;B[ni]
 ;W[rg]LB[rf:A][qg:B][ok:D][dp:C]C['a' and 'b' keep the corner. If omitted, Black will also keep the corner, but White will strenghen himself much on the right by attacking the Black stones. Therefore, Black must choose a big tenuki 'c' in precompensation, but not the local pseudo-attack 'd', which is a mistake.]
 (;B[rf]
 ;W[pk])
 (;B[qg]
 ;W[qh])
 (;B[]C[Black plays elsewhere.]
 ;W[sc]C[Illstrated continuation; White is unsuccessful (demonstrating Black's tenuki is viable).]
 ;B[qa]
 ;W[rf]
 ;B[pe]
 ;W[se]
 ;B[sb]
 ;W[sa]
 ;B[sf]
 ;W[sg]
 ;B[pa]
 ;W[sd]
 ;B[qe]LB[sb:B][qg:A]C[White gets a good result after 'a'. 'b' doesn't capture the Black stones.]
 (;W[qg]
 ;B[ra]
 ;W[pf]
 ;B[sb]
 ;W[pk])
 (;W[sb]
 ;B[ra]
 ;W[sf]
 ;B[qg]
 ;W[rh]
 ;B[qh]
 ;W[ri]
 ;B[qi]
 ;W[qj]
 ;B[rj]
 ;W[rk]
 ;B[pj]
 ;W[qk]
 ;B[oi]C[White loses.]
 ;W[ph]
 ;B[og]))
 (;B[ok]LB[sc:A][pk:B]C['a' is correct.
 'b' comes from game 1 of the 1973 Honinbo Title between Yoshio Ishida (Black in this figure) and Rin Kaiho. In retrospect, Ishida did not consider the outcome to his advantage.]
 (;W[sc]LB[qa:A][sd:B]C[Usually, 'a' is better than 'b'.]
 (;B[qa]
 ;W[rf]
 ;B[pe]
 ;W[se]
 ;B[sb]
 ;W[sa]
 ;B[qg]
 ;W[qh]LB[pa:A][sf:B]C['a' or 'b'.]
 (;B[pa]
 ;W[sd]
 ;B[qe]
 ;W[ri]
 ;B[ra]
 ;W[ql])
 (;B[sf]
 ;W[sg]
 ;B[pa]
 ;W[sd]
 ;B[qe]
 ;W[sf]
 ;B[ra]
 ;W[ri]
 ;B[sb]
 ;W[ql]))
 (;B[sd]
 ;W[oa]
 ;B[pa]
 ;W[sa]C[Ko.]))
 (;W[pk]LB[qg:a][ol:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[qg]
 ;W[ol]
 ;B[qh]
 ;W[ng]
 ;B[nk]
 ;W[pl]C[White gains an advantage with 42.])
 (;B[ol]C[Black cannot play 37 here; the position in the corner does not allow it.]
 ;W[sc]
 ;B[qa]
 ;W[rf]
 ;B[pe]
 ;W[se]
 ;B[sb]
 ;W[sa]
 ;B[sf]
 ;W[sg]
 ;B[pa]
 ;W[sd]
 ;B[qe]
 ;W[sf]
 ;B[qg]
 ;W[rh]
 ;B[qh]
 ;W[ri]
 ;B[qi]
 ;W[qj]C[White 36 is in perfect position to trap Black.])))))
 (;W[ni]LB[ph:a][dp:b]C[White 30 reveals White's thinness.
 Black takes advantage at 'a'. Playing elsewhere ('b') misses an opportunity.]
 (;B[ph]LB[mg:b][oh:a]C[Now Black must play 'a' or 'b', strenghtening Black just to stay connected.]
 (;W[oh]
 ;B[pi])
 (;W[mg]
 ;B[lh]))
 (;B[]
 ;W[pi]C[White 31 fixes White's shape.])))
 (;B[ph]LB[lg:A][qg:C][nh:B]C['a' is usual, 'b' can be inferior, 'c' creates a ko.]
 (;W[lg]
 ;B[jf]
 ;W[nh])
 (;W[nh])
 (;W[qg]
 ;B[pg]
 ;W[rf]LB[pe:A][pf:B]
 (;B[pe]
 ;W[pf]
 ;B[qe]
 ;W[sc]
 ;B[sd]
 ;W[sa]
 ;B[rg]
 ;W[oa]
 ;B[pa]
 ;W[na]C[Ko.])
 (;B[pf]
 ;W[sc]
 ;B[qa]
 ;W[oa]
 ;B[pa]
 ;W[na]
 ;B[ra]
 ;W[sb]
 ;B[pe]
 ;W[se]
 ;B[qe]
 ;W[sd]
 ;B[rg]
 ;W[sg]
 ;B[rh]LB[ne:A][mf:B]C[Ko. Black ko threats on 'a' and 'b'.]))))
 (;W[oa]C[White 28 does not work because of the exchange of Black 13, White 16.]
 ;B[pa]
 ;W[na]
 ;B[ra]CR[qa]C[Without the exchange of Black 13, White 16, White could play at the marked location (and win the fight).])
 (;W[pa]
 ;B[oa]
 ;W[ra]
 ;B[ma]
 ;W[la]
 ;B[sb]C[Because of the double ko, Black can win. If another ko appears elsewhere, however, White has an endless supply of ko threats.])
 (;W[sc]LB[qa:a][sd:b]C[White 28 is another attempt that should not work, but Black must be careful. Black continues with 'a'; Black 'b' is a mistake.]
 (;B[qa]LB[rg:a]C[White 'a' is sente.])
 (;B[sd]C[Black 29 is a mistake.]
 ;W[oa]
 ;B[pa]
 ;W[sa]
 ;B[qa]
 ;W[na]))
 (;W[lg]
 ;B[kg]
 ;W[kh]
 ;B[jg]
 ;W[lf]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[ic])
 (;AW[fc]
 ;W[lg]
 ;B[kg]
 ;W[kh]
 ;B[jg]
 ;W[lf]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[ic]
 ;B[id]
 ;W[hd]
 ;B[lh]
 ;W[nh]
 ;B[li]
 ;W[ie]
 ;B[je]
 ;W[rg]
 ;B[qg]
 ;W[qh]
 ;B[ph]
 ;W[pg]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[pi]
 ;B[qj]
 ;W[pj]
 ;B[qk]LB[ki:A]C[Later, White can run away with 'a' with external help like a stone in the bottom left corner.])
 (;AW[fc]
 ;W[id]
 ;B[lg]
 ;W[oi]
 ;B[qi]
 ;W[mi]
 ;B[ki]
 ;W[lk]
 ;B[jk])))
 (;B[ld]C[Black 23 is not recommended.]
 ;W[qf]
 ;B[kd]
 ;W[jc]
 ;B[of]
 ;W[pa]C[White 28, aiming for a ko later, is nicely timed.]
 ;B[oa]
 ;W[rf]
 ;B[ne]
 ;W[pe]
 ;B[sb]
 ;W[qi]LB[ra:a]C[White can get a ko later with a play at 'a'.])))
 (;W[qf]LB[pb:A][rf:B]C['a' or 'b'.]
 (;B[pb]
 ;W[lb]LB[lb:22][pb:21][qf:20]C[This is the same variation as if White played 20 and 22 in reversed order.])
 (;B[rf]
 ;W[lb]
 ;B[pb]
 ;W[kc]
 ;B[me]
 ;W[of])))
 (;B[mb]C[Black 17 is not recommended.]
 ;W[re]C[White 18, capturing the three Black stones, is good enough.]))
 (;W[mb]LB[nb:b][pb:a]C[White 16 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pb]LB[rb:A][kc:B]
 (;W[rb]
 ;B[sb]
 ;W[kc]
 ;B[me]
 ;W[lb]
 ;B[of]
 ;W[pf]
 ;B[ne]
 ;W[pe]
 ;B[ph])
 (;W[kc]
 ;B[me]LB[lb:b][rc:13][of:a]C[Now 'a' and 'b' are miai.
 See the variation of Black 13 being on the marked position instead for continuations.]MA[rb]))
 (;B[nb]C[Black 17 is a mistake.]
 ;W[lb]
 ;B[pb]
 ;W[kc]
 ;B[me]
 ;W[of])))
 (;W[rb]C[White 14 is not recommended, but was the reply Takagawa made against Go Seigen when Go first played Black 13.]
 ;B[re]
 ;W[mc]LB[lc:A][me:B]C['a' is better than 'b'.]
 (;B[lc]
 ;W[mb]
 ;B[nb]
 ;W[lb]
 ;B[pb]
 ;W[oa]
 ;B[pa]
 ;W[kc]
 ;B[me]
 ;W[of]
 ;B[qf]
 ;W[nf])
 (;B[me]
 ;W[pf]
 ;B[qf]
 ;W[pe]
 ;B[pg]LB[pb:a][nf:b]
 (;W[pb]
 ;B[lc]
 ;W[mb]
 ;B[qg]LB[rb:14][rc:13][re:15]C[
 There is a similar variation after Black plays 15 instead of 13.
 The only difference between the two variations is the forced exchange of Black 13 and White 14; here White has unconditionally  lost 2 points.])
 (;W[nf]C[White 22, attempting to avoid the 2-point loss from playing White 14, is a mistake. Go Seigen made this mistake against Fujisawa Shuko in the 1st Meijin Title League in 1961.]
 ;B[pb]
 ;W[rf]
 ;B[qg]
 ;W[sc]
 ;B[rg]
 ;W[mb]
 ;B[nb]
 ;W[oa]
 ;B[mg]
 ;W[ng]
 ;B[lc]C[Nice block by Black.]
 ;W[lb]
 ;B[nh]LB[na:a][oh:b]C[Black 35 is an excellent squeeze play.
 The game continued with 'a'. Variation 'b' demonstrates a different but fruitless approach.]
 (;W[na]
 ;B[ne]
 ;W[of]
 ;B[mf]
 ;W[pa]C[Black gets superior thickness.])
 (;W[oh]
 ;B[kb]
 ;W[kc]
 ;B[ld]
 ;W[jb]
 ;B[ka]
 ;W[ja]
 ;B[kd]
 ;W[jc]
 ;B[ne]
 ;W[of]
 ;B[og]
 ;W[mh]
 ;B[ni]
 ;W[mf]
 ;B[lg]
 ;W[lf]
 ;B[kf]
 ;W[kg]
 ;B[lh]
 ;W[ke]
 ;B[jf]LB[jd:b][je:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[je]
 ;B[le])
 (;W[jd]
 ;B[je]C[White cannot get a snapback.]))))))
 (;B[re]LB[mc:a][qf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mc]
 ;B[me]LB[pb:c][pe:b][of:e][pf:a][qf:d]C[White continues with 'a' or 'b'. White 'c', 'd' and 'e' are less favorable.]
 (;W[pf]
 ;B[qf]
 ;W[pe]LB[mb:b][pg:a]C[Black continues with 'a' or 'b'.]
 (;B[pg]LB[pb:a][nf:b][qg:c]C[White continues with 'a' or 'b' .
 'c' is disadvantageous.]
 (;W[pb]
 ;B[lc]LB[mb:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[mb]LB[of:b][qg:a]C[Black continues with the quiet 'a', leaving 'b' in reserve (though 'b' is playable).]
 (;B[qg]C[The definitive pattern developed in the mid-1950s.])
 (;B[of]
 ;W[nb]
 ;B[qg]))
 (;W[qg]LB[mb:B][rf:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[rf]
 ;W[mb]
 ;B[qh]LB[lb:B][of:A]
 (;W[of])
 (;W[lb]))
 (;B[mb]
 ;W[rf])))
 (;W[nf]LB[mb:A][pb:C][lc:B]C[White 20 was played by Kuko Norio against Kobayashi Koichi in the 24th Tengen Title match, 1998-11-05.
 'a' is correct, 'b' and 'c' are mistakes.]
 (;B[mb]
 ;W[lc]
 ;B[lb]LB[pb:c][kc:a][qg:b]C[White continues with 'a'; White 'b' is less preferable. 'c'.]
 (;W[kc]LB[kb:B][pb:C][rc:A][qg:D]C['a' and 'b' are correct.
 'c' and 'd' are mistakes.]
 (;B[rc]LB[pb:A][qg:B]C['a' or 'b'.]
 (;W[pb]
 ;B[oa]LB[rb:A][qg:B]
 (;W[rb]
 ;B[ob]
 ;W[qg]
 ;B[rf]LB[kb:B][rg:A]C['a' and 'b' are both joseki.]
 (;W[rg]LB[pa:A][qi:B]C['a' is correct. 'b' is a mistake.]
 (;B[pa]
 ;W[qi]LB[ke:A][ph:B]C['a' is correct. 'b' is not advantageous.]
 (;B[ke]LB[id:B][oh:A]C['a' is correct. 'b' pushes the opponent to much influence.]
 (;W[oh]
 ;B[jd])
 (;W[id]
 ;B[ph]
 ;W[mg]
 ;B[pi]
 ;W[qj]
 ;B[pj]
 ;W[qk]
 ;B[pk]
 ;W[pl]
 ;B[ol]
 ;W[pm]
 ;B[jg]
 ;W[mi]
 ;B[mk]))
 (;B[ph]
 ;W[ke]
 ;B[lf]
 ;W[nh]
 ;B[pi]
 ;W[qj]
 ;B[pj]
 ;W[qk]
 ;B[pk]
 ;W[pl]
 ;B[ol]
 ;W[pm]
 ;B[kf]
 ;W[mi]
 ;B[mk]
 ;W[ki]
 ;B[if]
 ;W[jk]))
 (;B[qi]
 ;W[ph]
 ;B[og]
 ;W[ri]LB[pa:A][oh:B]C[Neither 'a' nor 'b' give a good result.]
 (;B[pa]
 ;W[ng]
 ;B[oh]
 ;W[pi]
 ;B[lf]
 ;W[mh]
 ;B[oi]
 ;W[pj]
 ;B[oj]
 ;W[ok])
 (;B[oh]
 ;W[sf]
 ;B[ne]
 ;W[of]
 ;B[mg]
 ;W[se]
 ;B[mf]
 ;W[sc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[if]
 ;W[ib])))
 (;W[kb]
 ;B[pa]
 ;W[ke]LB[lf:B][ph:A]C['a' is correct, 'b' just creates a heavy group.]
 (;B[ph]
 ;W[mf])
 (;B[lf]
 ;W[og]
 ;B[ph]
 ;W[oi]
 ;B[pi]
 ;W[oj]
 ;B[pj]
 ;W[ok])))
 (;W[qg]
 ;B[rf]
 ;W[ob]
 ;B[nb]
 ;W[kb]
 ;B[rb]
 ;W[ke]
 ;B[ph]
 ;W[mf]))
 (;W[qg]
 ;B[rf]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[kb]
 ;B[rb]
 ;W[ke]
 ;B[lf]
 ;W[oh]
 ;B[lh]
 ;W[ph]))
 (;B[kb]LB[jc:b][qg:a]C[White continues with 'a'. 'b' is disadvantageous.]
 (;W[qg]
 ;B[rf]LB[rg:A][qh:B][qi:C]C['a' is correct, all variations after 'a' favor White, 'b' and 'c' are mistakes.]
 (;W[rg]LB[pb:D][rb:C][rc:E][ph:B][qi:A]C['a' is best.
 'b' is possible.
 'c' and 'd' are mistakes.]
 (;B[qi]LB[ph:A][ri:B]
 (;W[ph]
 ;B[og]LB[qh:B][ri:A]C['a' is correct. 'b' is a mistake.]
 (;W[ri]
 ;B[oh]
 ;W[mf]
 ;B[pi]LB[pb:A][sg:B][rh:C]C['a' is better than 'b' is better than 'c'.
 'a' provides a ko threat,]
 (;W[pb]LB[ob:A][rh:B]
 (;B[ob]
 ;W[sg]LB[pb:36][jc:A][rh:B]C['a' is correct. As White has ko threat thanks to White 36, 'b', leading to a ko, is disadvantageous.]
 (;B[jc]
 ;W[oa]
 ;B[nb]
 ;W[rh]
 ;B[kd]
 ;W[mh]
 ;B[qk])
 (;B[rh]
 ;W[qh]
 ;B[rj]
 ;W[sh]
 ;B[sj]
 ;W[rc]
 ;B[si]
 ;W[sd]
 ;B[rh]
 ;W[oa]
 ;B[sf]
 ;W[nb]C[White is better.]))
 (;B[rh]
 ;W[nb]
 ;B[jc]
 ;W[ic]
 ;B[kd]
 ;W[ob]LB[ib:A][jd:B]
 (;B[ib]
 ;W[jd]
 ;B[jb]
 ;W[id]
 ;B[hc]
 ;W[hd]
 ;B[gc])
 (;B[jd]
 ;W[ib])))
 (;W[sg]
 ;B[jc]
 ;W[rj]
 ;B[ke]
 ;W[mh]LB[rc:A][mi:B]C['a' is correct. 'b' is a mistake.]
 (;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[sc]
 ;B[mi]C[White can play ko.])
 (;B[mi]
 ;W[lh]
 ;B[oj]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[qh]
 ;B[mj]))
 (;W[rh]
 ;B[rc]
 ;W[rb]
 ;B[sb]LB[pa:C][nb:B][qk:A]
 (;W[qk]
 ;B[ke]
 ;W[nb]
 ;B[ob]
 ;W[sf]
 ;B[ra]
 ;W[qa]
 ;B[pk]
 ;W[pl]
 ;B[ok]
 ;W[se]LB[sc:A]C[White still must occupy 'a' to change the corner from ko to his life.])
 (;W[nb]
 ;B[ob]
 ;W[sf]
 ;B[rj]
 ;W[sc]
 ;B[ke]
 ;W[ic]
 ;B[jc])
 (;W[pa]
 ;B[nb]
 ;W[qk]
 ;B[ke]
 ;W[mh]
 ;B[pk]
 ;W[ql]
 ;B[pb]
 ;W[nk]
 ;B[nl]
 ;W[ml]
 ;B[pl]
 ;W[nm]
 ;B[pm]
 ;W[rn])))
 (;W[qh]
 ;B[oh]
 ;W[pi]
 ;B[ne]
 ;W[of]
 ;B[mg]))
 (;W[ri]LB[rc:B][ph:A][rj:C]
 (;B[ph]LB[sg:A][rh:B]C['a' is correct. 'b' is a mistake.]
 (;W[sg]LB[jc:B][rc:A][rj:C]
 (;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[sc]LB[jc:B][sd:A]
 (;B[sd]
 ;W[sf])
 (;B[jc]
 ;W[mf]
 ;B[kd]
 ;W[rh]))
 (;B[jc]
 ;W[mf]
 ;B[kd]
 ;W[rh]
 ;B[qk])
 (;B[rj]
 ;W[rh]LB[si:A][ql:B]
 (;B[si]
 ;W[rc]
 ;B[qh]
 ;W[sd])
 (;B[ql]
 ;W[jc]
 ;B[lf]
 ;W[nh]
 ;B[pb]
 ;W[rc]
 ;B[pa]
 ;W[sd])))
 (;W[rh]
 ;B[rc]
 ;W[rb]
 ;B[sb]LB[nb:A][qk:B]
 (;W[nb]
 ;B[ob]
 ;W[sf]
 ;B[ra]
 ;W[qa]
 ;B[mf]
 ;W[ng]
 ;B[mg]
 ;W[nh]
 ;B[mh]
 ;W[ni]
 ;B[lj]C[Good for Black. Two stage ko in the corner.])
 (;W[qk])))
 (;B[rc]
 ;W[rb]LB[sb:A][ph:B]
 (;B[sb]
 ;W[qj]
 ;B[pb]
 ;W[ph]
 ;B[ke]C[Good for Black.])
 (;B[ph]LB[sg:A][rh:B]C['a' is correct. 'b' is a mistake.]
 (;W[sg]LB[mf:B][rh:C][rj:A]
 (;B[rj]
 ;W[rh]
 ;B[si]
 ;W[sc]
 ;B[qh]
 ;W[sd])
 (;B[mf]
 ;W[ng]
 ;B[mg]
 ;W[nh]
 ;B[mh]
 ;W[ni]
 ;B[jd]
 ;W[mi])
 (;B[rh]
 ;W[qh]
 ;B[rj]LB[sh:A][pi:B]C['a' is correct. 'b' is a mistake.]
 (;W[sh]
 ;B[nh]
 ;W[mf]
 ;B[sj]LB[sc:B][qj:A]C['a' is correct. 'b' is a mistake.]
 (;W[qj]
 ;B[pi]
 ;W[rk]
 ;B[qk]
 ;W[pj]
 ;B[rl]
 ;W[pb]
 ;B[oa]
 ;W[ob]
 ;B[nb]
 ;W[jc]LB[jb:A][sk:B]
 (;B[jb]
 ;W[sc]
 ;B[ic]
 ;W[le]
 ;B[oj])
 (;B[sk]
 ;W[sc]
 ;B[si]
 ;W[sd]
 ;B[rh]
 ;W[jb]
 ;B[sf]
 ;W[ka]))
 (;W[sc]
 ;B[si]
 ;W[sd]
 ;B[rh]))
 (;W[pi]
 ;B[ng]
 ;W[nh]
 ;B[oi]
 ;W[qj]
 ;B[mg])))
 (;W[rh]
 ;B[sb]
 ;W[nb]
 ;B[ob]
 ;W[sf]
 ;B[ra]
 ;W[qa]
 ;B[mf]
 ;W[ng]
 ;B[mg]
 ;W[nh]
 ;B[mh]
 ;W[ni]
 ;B[lj])))
 (;B[rj]
 ;W[ph]
 ;B[og]
 ;W[pi]
 ;B[mg]
 ;W[ng])))
 (;B[ph]
 ;W[qi]LB[rc:A][pi:B]
 (;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[pa]
 ;B[nb]
 ;W[sf]
 ;B[ra]
 ;W[oa]
 ;B[pb]
 ;W[qa]
 ;B[na]
 ;W[sa]LB[sc:B][qh:A]
 (;B[qh]
 ;W[rh]
 ;B[ra])
 (;B[sc]
 ;W[se]
 ;B[ra]
 ;W[mf]))
 (;B[pi]
 ;W[qj]
 ;B[mg]
 ;W[ng]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[mf]
 ;B[ne]
 ;W[of]
 ;B[lf]
 ;W[le]
 ;B[ld]
 ;W[ke]
 ;B[kd]
 ;W[je]
 ;B[jc]
 ;W[lg]))
 (;B[rc]
 ;W[rb]LB[sb:B][ph:C][qi:A]C['a', 'b' or 'c'.]
 (;B[qi]
 ;W[ri]
 ;B[ph]
 ;W[sg]LB[rh:B][rj:A]C['a' or 'b'.]
 (;B[rj]
 ;W[rh]
 ;B[si]
 ;W[sc]
 ;B[qh]
 ;W[sd])
 (;B[rh]
 ;W[qh]
 ;B[rj]
 ;W[sh]
 ;B[nh]
 ;W[mf]
 ;B[sj]
 ;W[qj]
 ;B[pi]
 ;W[rk]
 ;B[qk]
 ;W[pj]
 ;B[rl]
 ;W[pb]
 ;B[na]
 ;W[ob]
 ;B[nb]
 ;W[jc]LB[jb:A][sk:B]C['a' gives the right, 'b' the top side.]
 (;B[jb]
 ;W[sc]
 ;B[ic]
 ;W[le]
 ;B[oj])
 (;B[sk]
 ;W[sc]
 ;B[si]
 ;W[sd]
 ;B[rh]
 ;W[jb]
 ;B[sf]
 ;W[ka])))
 (;B[sb]
 ;W[nb]
 ;B[ob]
 ;W[sc]
 ;B[sd]
 ;W[sf]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[sa])
 (;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[mg]
 ;W[ng]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[mf]
 ;B[ne]
 ;W[of]
 ;B[lf]
 ;W[le]
 ;B[ld]
 ;W[ke]
 ;B[kd]
 ;W[je]LB[jc:A][lg:B]C['a' or 'b'.]
 (;B[jc]
 ;W[lg]
 ;B[kf]
 ;W[lh]
 ;B[mi]
 ;W[jg])
 (;B[lg]
 ;W[jc])))
 (;B[rb]
 ;W[nb]
 ;B[ob]
 ;W[rc]
 ;B[sc]LB[ra:B][sb:A]
 (;W[sb]
 ;B[sa]
 ;W[qa]
 ;B[pa]
 ;W[sf]
 ;B[na]
 ;W[sd]
 ;B[pb]
 ;W[se])
 (;W[ra]
 ;B[sb]
 ;W[sf]))
 (;B[pb]
 ;W[nb]
 ;B[na]
 ;W[rc])
 (;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[nb]
 ;B[ob]
 ;W[sc]
 ;B[sd]
 ;W[sf]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[sa]))
 (;W[qh]
 ;B[rc]LB[pb:A][rb:B][nh:C][oh:D]C['a' and 'b' are correct, 'c' and 'd' are disadvantageous.]
 (;W[pb]
 ;B[oa]
 ;W[rb]
 ;B[ob]
 ;W[sb]
 ;B[pa])
 (;W[rb]
 ;B[pb]
 ;W[oh]
 ;B[jd]
 ;W[jc]
 ;B[ic]
 ;W[kd]
 ;B[ke]LB[id:A][je:B]C[White cannot escape on 'a' nor 'b'.]
 (;W[id]
 ;B[je]
 ;W[ib]
 ;B[hc]
 ;W[jb]
 ;B[hb])
 (;W[je]
 ;B[id]
 ;W[le]
 ;B[kf]
 ;W[mf]
 ;B[jb]))
 (;W[nh]
 ;B[jd])
 (;W[oh]))
 (;W[qi]
 ;B[og]
 ;W[rg]
 ;B[mg]LB[mf:A][ng:B]
 (;W[mf]
 ;B[ne]
 ;W[of]
 ;B[lf])
 (;W[ng]
 ;B[of]
 ;W[ne]
 ;B[nh])))
 (;W[jc]LB[mf:A][qg:C][rg:B]C['a', 'b' or 'c'.]
 (;B[mf]
 ;W[ng]
 ;B[qg]LB[jb:a][id:b]C[Owing to the White corner stones, White 'a' and 'b' are sente.]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[ni]
 ;B[kf]
 ;W[id]LB[rb:a][if:b]C[Black continues with 'a'. Black 'b' lets White cause trouble in the corner.]
 (;B[rb]C[Black 8 in the corner is necessary.]
 ;W[if]
 ;B[mh]
 ;W[nh]
 ;B[jh]C[Black's center stones should be okay.])
 (;B[if]C[Black 37 is a mistake. Black needed to tend to the corner first.]
 ;W[rc]
 ;B[pa]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[jb]
 ;W[ib]
 ;B[na]
 ;W[ja]
 ;B[ka]
 ;W[ia]
 ;B[rf]C[Black has to add 49.]
 ;W[qa]C[White 50 starts a ko which White takes first. A terrible result for Black.]))
 (;B[rg]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[jb]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[pa]
 ;W[mf]
 ;B[ke])
 (;B[qg]
 ;W[pb]
 ;B[oa]
 ;W[ob]
 ;B[nb]
 ;W[jb]
 ;B[rb])))
 (;B[pb]
 ;W[qg]
 ;B[rf]
 ;W[qh]LB[rb:A][of:C][ph:B]C['a' is preferred. 'b' leads to a tough fight. 'c' is a trick play.]
 (;B[rb]LB[ke:A][oh:B]
 (;W[ke]
 ;B[ph]
 ;W[pi]
 ;B[nh]
 ;W[pj]
 ;B[lf]
 ;W[mf]
 ;B[le]
 ;W[mh]
 ;B[kf]
 ;W[mi])
 (;W[oh]))
 (;B[ph]
 ;W[pi]
 ;B[nh]LB[qi:B][qj:A]
 (;W[qj]LB[ke:B][oi:A]
 (;B[oi]
 ;W[mf]LB[rg:B][pk:A]
 (;B[pk]
 ;W[qk]
 ;B[pl]
 ;W[nb]
 ;B[na]
 ;W[pa]
 ;B[ob]
 ;W[rc]
 ;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[ra]
 ;B[oa]
 ;W[rg]
 ;B[qa]
 ;W[og]
 ;B[oh]
 ;W[pa]C[Without a big ko threat, Black is unhappy.])
 (;B[rg]
 ;W[og]
 ;B[oh]
 ;W[rh]
 ;B[ke]
 ;W[lf]
 ;B[pk]
 ;W[qk]
 ;B[kd]
 ;W[nb]
 ;B[na]
 ;W[pa]
 ;B[ob]
 ;W[rc]
 ;B[kf]
 ;W[sd]
 ;B[lg]))
 (;B[ke]
 ;W[mh]
 ;B[mi]
 ;W[oh]
 ;B[lh]
 ;W[mg]
 ;B[lg]
 ;W[li]
 ;B[jg]
 ;W[lj]))
 (;W[qi]
 ;B[oi]
 ;W[mf]
 ;B[rb]
 ;W[le]
 ;B[pj]
 ;W[oj]
 ;B[qj]
 ;W[rj]
 ;B[ri]
 ;W[ni]
 ;B[oh]
 ;W[rh]
 ;B[rk]
 ;W[si]
 ;B[ok]
 ;W[nj]
 ;B[mh]
 ;W[qk]
 ;B[pk]
 ;W[ql]
 ;B[nk]
 ;W[pm]
 ;B[mj]))
 (;B[of]LB[ne:A][og:B]C['a' is correct, 'b' is getting tricked.]
 (;W[ne]
 ;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[pj]
 ;W[qk]
 ;B[lf]
 ;W[nh])
 (;W[og]
 ;B[ph])))
 (;B[qg]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[kb]))
 (;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[qj]
 ;B[mg]C[Black 31 is a bold tesuji.]
 ;W[ng]
 ;B[ne]
 ;W[of]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[mf]
 ;B[lf]
 ;W[lg]
 ;B[kf]
 ;W[mi]
 ;B[lh]
 ;W[oi]
 ;B[nj]
 ;W[oj]
 ;B[nk]
 ;W[pj]
 ;B[kc]
 ;W[rc]C[White has 30 points of territory. Black has magnificant thickness. The result is considered far superior for Black.])
 (;W[pb]LB[ob:A][kc:B]C['a' or 'b' both ok.]
 (;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[rc]
 ;B[qg]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hb]
 ;B[gb]C[White corner group is dead.])
 (;B[kc]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[ph]
 ;W[ri]
 ;B[qi]
 ;W[rh]
 ;B[of]
 ;W[ne]
 ;B[mg])))
 (;B[lc]
 ;W[mb]
 ;B[nb]
 ;W[lb]
 ;B[pb]LB[oa:A][kc:B]
 (;W[oa]
 ;B[kb]
 ;W[kc]
 ;B[la]
 ;W[ld]
 ;B[ma]
 ;W[lc]
 ;B[na]
 ;W[jb]
 ;B[rb]
 ;W[qg])
 (;W[kc]
 ;B[rb]
 ;W[ke]))
 (;B[pb]
 ;W[nb]
 ;B[mb]
 ;W[lc]
 ;B[na]
 ;W[rf]
 ;B[qg]
 ;W[rc]
 ;B[rg]
 ;W[pa]
 ;B[ob]
 ;W[lb]))
 (;W[qg]
 ;B[rf]
 ;W[pb]
 ;B[lc]
 ;W[mb]
 ;B[qh]LB[lb:A][og:B]C[After 'a', Black gets influence in the center, after 'b' to the top.]
 (;W[lb]
 ;B[of])
 (;W[og]
 ;B[ph]
 ;W[nf]
 ;B[lb]
 ;W[nb])))
 (;B[mb]C[Black 19 was played by Iwamoto Kaoru against Kitani Minoru in November 1947 in game 3 of the 4th Honinbo title.]
 ;W[lc]
 ;B[lb]
 ;W[qg]
 ;B[rf]
 ;W[ph]LB[pb:b][rb:a][og:c]C[Black continues with 'a' to 'c'.]
 (;B[rb]C[Continuation of the 1947 Kitani-Iwamoto game.]
 ;W[kc]
 ;B[og]
 ;W[pg]
 ;B[pb]
 ;W[lf]
 ;B[mf]
 ;W[mg]
 ;B[kd]
 ;W[ic]
 ;B[jc]
 ;W[jb]
 ;B[jd]
 ;W[kb]
 ;B[kf]
 ;W[kg]
 ;B[jf]
 ;W[gc]
 ;B[jg]
 ;W[kh]
 ;B[ge]
 ;W[db])
 (;B[pb]
 ;W[kc]
 ;B[og]
 ;W[pg]LB[rb:a][ke:b]C[Black must play 'a', though he would like to play 'b'.]
 (;B[rb]
 ;W[ke]
 ;B[mg]C[This sequence was regarded as a perfected joseki, and quite popular around 1950. Two Black corner moves, 25 and 29, were necessary; this was the drawback of this pattern.])
 (;B[ke]C[Black 29 is premature.]
 ;W[pa]
 ;B[oa]
 ;W[nb]
 ;B[qa]
 ;W[ra]
 ;B[na]
 ;W[pa]
 ;B[ob]
 ;W[rc]
 ;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[rg]C[White 42 is big.]
 ;B[qa]C[Black gets first capture, but this large ko favors White, who has little to lose.]))
 (;B[og]
 ;W[pg]
 ;B[rc]C[Black 27 has the supposed advantage of only one Black play to take the corner (not two, as in other variations). But White has counter moves.]
 ;W[kc]
 ;B[ke]LB[nb:a][pb:b]C[White 'a', creating a ko, is better than 'b', which gives White forcing moves.]
 (;W[nb]
 ;B[ob]
 ;W[rb]
 ;B[rg]
 ;W[rh]
 ;B[qi]
 ;W[qh]LB[sb:a][sc:b]C[Black 'a' results in a ko. Black 'b' lets Black capture unconditionally,but the result does not favor Black.]
 (;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[sa]
 ;B[ra]
 ;W[qa]
 ;B[pa])
 (;B[sc]C[Black 37 lets Black capture the White corner stones unconditionally.
 Black pays for it by being sealed in, and having to later take the White corner stones off the board.]
 ;W[kb]LB[na:a][dp:b]C[Black must take at 'a'. Black cannot afford to play elsewhere.]
 (;B[na]
 ;W[id])
 (;B[]C[Black plays elsewhere, a mistake.]
 ;W[oa]
 ;B[na]
 ;W[pa])))
 (;W[pb]
 ;B[oa]
 ;W[ob]
 ;B[nb]
 ;W[rb]
 ;B[na]
 ;W[sb]
 ;B[pa]LB[kb:a][rg:b]C[White 'a' or 'b' are sente.]
 (;W[kb]
 ;B[qa])
 (;W[rg]
 ;B[qa])))))
 (;W[pe]
 ;B[qf]LB[pb:A][pf:B]
 (;W[pb]
 ;B[lc]
 ;W[mb]
 ;B[pf]
 ;W[nb])
 (;W[pf]
 ;B[pg]
 ;W[nf]LB[pe:16][pf:18]C[Same position as a variation of White 16 played on 18.]))
 (;W[pb]C[White 16 gives Black a slightly favorable result.]
 ;B[lc]
 ;W[mb]
 ;B[pe]LB[nb:a][oe:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nb]
 ;B[qf])
 (;W[oe]C[White 20 is a mistake. White gets caught in a ladder.]
 ;B[of]
 ;W[pf]
 ;B[ne]
 ;W[pe]
 ;B[pg]))
 (;W[qf]C[White 16 is not favorable.]
 ;B[pe]C[Black 17 seems vulgar but it works.]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg]LB[lc:a][og:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[lc]
 ;B[og]
 ;W[nf]
 ;B[mg]
 ;W[nb]
 ;B[ng]
 ;W[ob]C[Black has great thickness; White, about 12 points.])
 (;W[og]C[White 22 is unreasonable.]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[pb]LB[qg:b][ph:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[ph]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[ni]
 ;B[ke]C[Besides the large corner profit, Black is able to fight in the center with good prospects.])
 (;W[qg]C[White 28 is self-destructive.]
 ;B[ph]
 ;W[qh]
 ;B[qi]
 ;W[ri]
 ;B[oh]LB[mf:b][mg:a]C[White may try 'a' or 'b'.]
 (;W[mg]
 ;B[qj]
 ;W[rf]
 ;B[rb]
 ;W[rj]
 ;B[nh]LB[ng:a][rk:b]C[Now 'a' and 'b' are miai. White loses either way.])
 (;W[mf]
 ;B[qj]
 ;W[rf]
 ;B[rb]
 ;W[rj]
 ;B[nh]
 ;W[qk]
 ;B[nf]
 ;W[ng]
 ;B[mg]C[Snapback.]))))
 (;W[of]
 ;B[qf]LB[mf:a][nf:b]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[mf]
 ;B[mb]C[Black sacrifices the two stones in sente.]
 ;W[lc]
 ;B[lb]
 ;W[kc]LB[kb:b][pb:a]C[Black continues with 'a' or the more aggressive 'b'.]
 (;B[pb]
 ;W[le])
 (;B[kb]LB[jc:b][le:a]C[White continues with 'a'. White 'b' is risky.]
 (;W[le]
 ;B[jc])
 (;W[jc]
 ;B[ne]C[Black sets his stones in motion.]
 ;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[mg]
 ;W[og]
 ;B[lf]C[The ponnuki gives Black a reasonable result.]
 ;W[pb]
 ;B[oa]C[Black 33 is the tesuji that puts Black one move ahead.]
 ;W[ob]
 ;B[nb]
 ;W[jb]
 ;B[na])))
 (;W[nf]C[White 18 is not recommended.]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[pb]
 ;W[lf]C[White's shape is thin.])))
 (;W[qf]
 ;B[rb]LB[pb:b][mc:a]C[White continues at 'a'. White 'b' is a mistake.]
 (;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[pb]
 ;W[kc]
 ;B[me]LB[lb:a][of:b]C[White is in trouble. 'a' and 'b' are miai for Black. If, however, the ladder is favorable for White, there is a way out.]
 ;W[of]CR[ld]LB[lb:a][kd:b]C[White plays this way if the ladder is favorable at the red dot.
 Black continues with 'a' or 'b'.]
 (;B[lb]
 ;W[nb]
 ;B[rc]
 ;W[ld]
 ;B[kb]
 ;W[jb]LB[jc:b][kd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[kd]
 ;W[le]LB[ke:b][mf:a]C[Black continues with 'a' or 'b'.]
 (;B[mf]
 ;W[jc]LB[ke:a][kf:b]C[Black captures the White stones in a ladder if possible with 'a'.
 If White has the ladder, squeezing with 'b' is good enough for
 Black.])
 (;B[ke]C[Black plays 31 with an unfavorable ladder, sacrificing two Black stones.]
 ;W[lf]
 ;B[jc]
 ;W[mf]))
 (;B[jc]C[Black 29 is a mistake.]
 ;W[kd]
 ;B[ib]
 ;W[jd]
 ;B[ic]
 ;W[mf]
 ;B[le]
 ;W[kf]C[White squeezes with 34 and 36.]))
 (;B[kd]
 ;W[lb]
 ;B[jd]C[Black 25 is adequate.]))
 (;W[pb]C[White 16 is a mistake.]
 ;B[lc])))
 (;B[rb]LB[mc:a][rc:b]C[White continues with 'a'. White 'b' is an early alternative to the joseki that developed, and not recommended.]
 (;W[mc]LB[mb:b][pb:a][lc:c]C[Black continues with 'a'. Black 'b' is not recommended. Black 'c' is something of a trick play that should not work if White plays carefully.]
 (;B[pb]
 ;W[lc]LB[ld:b][me:a][of:c]C[Black continues with 'a' or 'b', or, with a favorable ladder (in capturing Black 9) 'c'.]
 (;B[me]
 ;W[of]LB[jd:b][kd:a]C[Black continues with 'a' or 'b'. Black must have the ladder to play 'b'.]
 (;B[kd])
 (;B[jd]C[Black must have the ladder to play 19.]
 ;W[ke]
 ;B[kd]
 ;W[ld]
 ;B[le]LB[je:b][lg:a]C[Now the issue of whether Black can capture White 20 in a ladder.
 White continues with 'a'. White 'b' is premature.]
 (;W[lg]C[White plays 24 if Black cannot capture White 20 in a ladder.]
 ;B[kf]
 ;W[je]
 ;B[lf]
 ;W[id]
 ;B[kb]
 ;W[nb]
 ;B[rc]
 ;W[jb]CR[ie]C[White 32 is a tesuji to get Black to cut at the marked location.]
 ;B[kc]
 ;W[lb]
 ;B[la]
 ;W[mb]
 ;B[ie]
 ;W[jf]
 ;B[ic]
 ;W[hd]
 ;B[ib]
 ;W[kg]
 ;B[mg]C[If Black 43....]
 ;W[mf]C[... White throws in and sets up a ladder.]
 ;B[nf]
 ;W[ne]
 ;B[mf]
 ;W[mh])
 (;W[je]LB[kb:a][id:b]C[White 24 is a mistake.
 Black continues with 'a'. Black 'b' is slack.]
 (;B[kb]
 ;W[nb]
 ;B[rc]
 ;W[id]
 ;B[mb]C[The throw-in of Black 29 puts White one move behind.]
 ;W[lb]
 ;B[la]
 ;W[ma]
 ;B[ka]C[White loses.])
 (;B[id]C[Black 25 is a mistake.]
 ;W[nb]
 ;B[rc]
 ;W[lg]
 ;B[mg]
 ;W[mf]
 ;B[lf]
 ;W[kf]
 ;B[nf]
 ;W[ne]
 ;B[mf]
 ;W[mh]))))
 (;B[ld]LB[kc:a][kd:b]C[Black 17 is tough-minded.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[kc]
 ;B[kd]LB[jc:b][jd:a]C[White continues with 'a'. White 'b' is slack.]
 (;W[jd]LB[jc:b][je:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[je]
 ;W[id]
 ;B[of]
 ;W[ne]
 ;B[mf]
 ;W[nf]
 ;B[ng]
 ;W[og]
 ;B[nh]
 ;W[re]
 ;B[rc]
 ;W[pg])
 (;B[jc]C[Black 21 is a mistake.]
 ;W[ic]
 ;B[jb]
 ;W[nb]C[White 24 is the reason the cut of Black 21 is unreasonable.]
 ;B[qa]
 ;W[ib]))
 (;W[jc]C[White 20 is slack.]
 ;B[of]
 ;W[ne]
 ;B[jd]
 ;W[id]
 ;B[ie]
 ;W[hd]
 ;B[nf]
 ;W[me]
 ;B[lf]C[White is short of liberties and cannot break through the Black
 net.]))
 (;W[kd]C[White 18 is rash.]
 ;B[mf]LB[kc:a][of:b]C['a' and 'b' are miai. White is in trouble.]))
 (;B[of]C[Black can play 17 only if the ladder to capture Black 9 is not favorable for White.]
 ;W[ne]
 ;B[pe]
 ;W[nf]
 ;B[qf]
 ;W[nh]))
 (;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[me]
 ;W[of]LB[rc:a][re:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rc]C[Black must play 21. The alternatives are not favorable.]
 ;W[ke]
 ;B[mg]
 ;W[oh])
 (;B[re]C[Black 21 is not recommended.]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[ke]
 ;W[id]
 ;B[lh]
 ;W[pa]C[White 28 is a great tesuji, often appearing in old avalanche
 sequences.]
 ;B[nb]
 ;W[rc]C[White sets up a 'flower-viewing' ko: Black has everything to
 lose.]
 ;B[sc]
 ;W[sb]))
 (;B[lc]LB[mb:b][rc:a]C[Black 15 is a trick play, though not obviously so. White continues with 'a'. White 'b' falls into the trap.]
 (;W[rc]
 ;B[re]
 ;W[mb]
 ;B[pb]
 ;W[sb]
 ;B[nb]
 ;W[lb]
 ;B[ra]
 ;W[qa]LB[oa:a][qf:b]C[Black loses the capturing race. Black best continue with 'a'.
 Black 'b' is not recommended.]
 (;B[oa]
 ;W[qf]
 ;B[kc]
 ;W[rf]
 ;B[kb]
 ;W[me]
 ;B[ld]C[White has a favorable result.])
 (;B[qf]C[Black 25 is not recommended.]
 ;W[me]
 ;B[ld]
 ;W[oa]
 ;B[kb]
 ;W[na]))
 (;W[mb]C[White 16 falls for the trick.]
 ;B[pb]LB[lb:b][kc:a]C[White loses. White continues with 'a'.
 White 'b', Black 'a', is ridiculous for White.]
 (;W[kc]
 ;B[me]
 ;W[lb]
 ;B[of]
 ;W[pf]
 ;B[ne]
 ;W[pe]
 ;B[pg]
 ;W[re]
 ;B[rc]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[qi]
 ;W[ri]
 ;B[rj]LB[sh:a][pi:b]C[White concedes with 'a', or struggles to cause trouble with 'a'.]
 (;W[sh]
 ;B[pi])
 (;W[pi]
 ;B[qj]
 ;W[oi]
 ;B[nh]
 ;W[sh]C[Black now has the two White center stones as a fresh target.]))
 (;W[lb]C[If you are considering this variation, now is a good time to
 take up chess.]
 ;B[kc]))))
 (;W[rc]C[White 14 is not recommended.]
 ;B[re]LB[ra:a][qf:b]C[White continues with 'a' or 'b'.]
 (;W[ra]LB[sb:b][qf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]LB[mc:b][of:a]C[White continues with 'a'. White 'b' is a reckless mistake.]
 (;W[of]
 ;B[lc]
 ;W[pb]
 ;B[ph]C[Black has nice shape on both sides, with White on the run in
 the center. Nice for Black.])
 (;W[mc]C[White 18 is a reckless mistake.]
 ;B[me]
 ;W[pb]
 ;B[mb]
 ;W[lc]
 ;B[nb]
 ;W[of]
 ;B[oe]))
 (;B[sb]C[Black 17, trying to prevent White from getting two eyes in the corner, is not recommended.]
 ;W[pb]))
 (;W[qf]
 ;B[sc]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[pb])))
 (;B[pe]LB[of:B][pf:A]C['a' is joseki. 'b' is also possible.]
 (;W[pf]
 ;B[rb]LB[rc:B][oe:A]C['a' is joseki. 'b' is not good.]
 (;W[oe]
 ;B[rc]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[pb]
 ;W[ld]
 ;B[me]
 ;W[kd]LB[ma:A][jc:B]C['a' is joseki. 'b' is a serious mistake.]
 (;B[ma]
 ;W[lf]
 ;B[mf]
 ;W[mg]C[This is the most easy and peaceful variation, according to Oya Koichi 9P.])
 (;B[jc]
 ;W[lf]
 ;B[mf]
 ;W[mg]
 ;B[ma]))
 (;W[rc]
 ;B[re]
 ;W[oe]
 ;B[sc]
 ;W[mc]
 ;B[lc]
 ;W[ra]
 ;B[sb]
 ;W[mb]
 ;B[pb]
 ;W[kc]
 ;B[me]
 ;W[lb]
 ;B[ke]
 ;W[hc]
 ;B[og]
 ;W[pg]
 ;B[oh]LB[nf:A]C[Playing on 'a' creates dane-zumari and isn't good for White.]))
 (;W[of]
 ;B[qf]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[jb]LB[me:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;B[me])
 (;B[re]
 ;W[me]))))
 (;B[mc]LB[md:b][rd:a]C[Black 9, a bit submissive, but adequate, and avoids the avalanche.
 White continues with 'a'. White 'b' is not recommended as giving a locally equal result, but may make strategic sense.]
 (;W[rd]
 ;B[qc]
 ;W[pf])
 (;W[md]LB[ld:a][re:b]C[White 10 only makes sense strategically; locally it results in a loss.]
 (;B[ld]
 ;W[qc]
 ;B[rd]
 ;W[qb]
 ;B[re]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]LB[jc:a][qh:b]C[Now 'a' and 'b' are miai for Black.]
 ;W[jc]
 ;B[qh]
 ;W[jb]
 ;B[pb]
 ;W[of]
 ;B[oh])
 (;B[re]
 ;W[qc]
 ;B[rd]
 ;W[lc]
 ;B[qb]
 ;W[ld]LB[gc:b][qf:a]C['a' and 'b' are miai.]
 ;B[qf]
 ;W[gc]C[White needs to extend at least as far as 18 to compensate for the loss in the corner.])))
 (;B[re]LB[qc:B][rd:A]C['a' is correct. 'b' is a mistake.]
 (;W[rd]
 ;B[qc]
 ;W[rf]LB[md:A][pe:B]C['a' or 'b'.]
 (;B[md]
 ;W[pf])
 (;B[pe]
 ;W[qf]
 ;B[md]
 ;W[of]))
 (;W[qc]
 ;B[rd]
 ;W[mc]
 ;B[qb]
 ;W[md]
 ;B[qf]))
 (;B[rd]
 ;W[md]
 ;B[re]
 ;W[qf]))
 (;W[rd]C[White avoids the avalanche.]
 ;B[qc]LB[pf:A][qk:B]C['a' is joseki, but the White formation is without extension.
 'b' sers up a mini-Chinese opening.]
 (;W[pf]C[
 * Joseki *])
 (;W[qk]
 ;B[qf]LB[pe:B][rf:A]C['a' is possible.
 After 'b' White is heavy, Black light. 'b' is possible if the
 White extension is nearer.]
 (;W[rf]
 ;B[pe]
 ;W[re]LB[pf:A][qg:B]C['a' is correct. 'b' is a mistake.]
 (;B[pf]
 ;W[qg]
 ;B[pg]
 ;W[qh]C[White territory and aji for Black thickness.]
 ;W[ph]TR[od][pd]C[To understand the aji of the two marked stones, assume White later plays here.]
 ;B[ng]
 ;W[nf]LB[mf:B][og:A]C['a' is correct, 'b' leads to bad shape.]
 (;B[og]
 ;W[mg]
 ;B[mh]
 ;W[lg]
 ;B[lh]
 ;W[kh]
 ;B[ni]
 ;W[kg]
 ;B[ne]
 ;W[kd])
 (;B[mf]
 ;W[og]
 ;B[ne]
 ;W[oe]
 ;B[of]
 ;W[nf]
 ;B[of]))
 (;B[qg]C[Mistake!]
 ;W[pf]
 ;B[oe]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[rj]
 ;W[ri]
 ;B[qi]
 ;W[qj]
 ;B[rh]
 ;W[rk]
 ;B[si]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[qa]
 ;W[sg]
 ;B[rg]
 ;W[sk]
 ;B[sf]
 ;W[of]
 ;B[ne]
 ;W[sj]C[Ko.]))
 (;W[pe]
 ;B[rf]
 ;W[qi])))
 (;W[dp]
 ;B[rd]
 ;W[pj]))
 (;B[rd]LB[nc:b][nd:a]C[Black 7 has the advantage of Black later extending down the right from Black 7. White continues with 'a'. White 'b' may be possible with support on the right.]
 (;W[nd]LB[qc:a]C[White treats Black 7 as equivalent to a solid connection at 'a', so White 8 is the only move, but unlike the solid connection, a potential cutting point at 'a' remains.]
 ;B[re]
 ;W[qf]
 ;B[mb]
 ;W[pk]C[Joseki
 ])
 (;W[nc]
 ;B[nd]
 ;W[nb]
 ;B[ne]
 ;W[pe]
 ;B[re]LB[qb:a]C[Unless Black can the two White cutting stones, Black 13 is advised.
 Black 'a' is too submissive.]
 ;W[qg])))
 (;W[]LB[nc:a][pc:c][pd:b]C[White plays elsewhere. Possible local Black continuations include 'a' to 'c'.])
 (;W[pc]C[White 4 is not joseki.]
 ;B[pd]
 ;W[qc])
 (;W[nd]LB[nc:C][pc:B][pd:A]C['a' is good for Black. 'b' and 'c' are known joseki in different orders.]
 (;B[pd]
 ;W[nc]
 ;B[ob]
 ;W[og]
 ;B[nb]
 ;W[lc]C[Joseki])
 (;B[pc]
 ;W[nc]LB[nc:6][oc:3][pc:5][nd:4]C[Same position as White 6 and Black 5 played before White 4, see there for continuation.])
 (;B[nc]
 ;W[pd]
 ;B[pc]
 ;W[qe]LB[nc:7][oc:3][pc:5][nd:8][od:2][pd:4][qd:1][qe:6]C[Same position as the large avalanche joseki referenced by the numbers, see there for continuations.])))
 (;B[oe]LB[qc:c][nd:b][pd:e][ne:a][pe:d]C[
 Ue-zuke (attach on top)
 --------------------------
 The idea of Black 3 is not to fall behind in influence. White continues with 'a' to 'c'.
 White can only play 'c' with a favorable ladder to the lower left corner. White suffers a serious loss of territory with potentially no compensation if the ladder is not favorable and Black plays most severely.
 White 'd' is not joseki. White loses the corner.
 'e' is totally wrong.
 a1 - Black choice
 b2 - Black right, White top
 c3 - Black choice; White must have the ladder or lose
 d4 - White loses the corner
+]
 (;W[ne]LB[nd:c][pe:a][of:b]C[Black continues with 'a' or 'b'. Black 'a' is typical.
 Black 'b' shows a tough attitude. If White plays in an equally uncompromising way, a large-scale complex fight can result. 'b' can also protect a moyo on the right by disabling White o14.
 'c' is a trick play.]
 (;B[pe]LB[qc:b][md:a][nd:D][nf:c]C[White continues with 'a' to 'c'. White 'd' is not recommended.
 a1 - Black choice of territory or influence
 b2 - Black corner; toward the top (sacrificing Black 3 & 5)
 c3 - White influence, oriented towards top, but sacrificing a
 large corner]
 (;W[md]LB[nc:c][oc:a][nf:b][dp:d]C[Black continues with 'a' for territory or 'b' for influence.
 White 'c' is an old pattern, no longer considered joseki.
 Tenuki 'd' is possible.]
 (;B[oc]C[This move has a value of 30 points.
+]
 ;W[nc]
 ;B[ob]LB[ic:b][ng:a]C[
 * Joseki *
 White continues with 'a' or 'b', or plays elsewhere.])
 (;B[nf]
 ;W[mf]LB[mg:b][ng:a]C[Black continues with 'a' or 'b'.]
 (;B[ng]
 ;W[mg]
 ;B[nh]LB[oc:b][qc:a]C[The joseki ends. A White play at 'a' is unreasonable. Black 'b' secures considerable profit.]
 ;W[qc]C[White 12 is unreasonable (not joseki).]
 ;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[nd]
 ;B[qb]LB[rc:b][qe:a]C[White cannot gain anything by cutting at 'a'. If White 'b', Black 'a' and it is all over.])
 (;B[mg]C[The two-step hane was not seen in classical Go. They are unyielding moves peculiar to modern Go.]
 ;W[ng]
 ;B[of]
 ;W[lf]LB[lg:A][mh:C][nh:B][dp:D]C['a' and 'b' are joseki. Black 'c' is mild.
 Variation 'd' shows continuation if Black plays elsewhere.]
 (;B[lg]LB[kf:a][kg:b]C[White continues with 'a' or 'b'.]
 (;W[kf]
 ;B[nh]LB[oc:b][qc:a]C[
 * Joseki *
 The joseki concludes. But the question of whether White plays 'a' or Black plays 'b' is important for corner profit. That Black 'b' is possible is a matter of course, but Black can counterattack against White 'a'.]
 ;W[qc]LB[pc:b][pd:a]C[Continuation. White is naturally eager to play 16.
 Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pd]
 ;W[pc]
 ;B[oc]
 ;W[nd]
 ;B[ob]
 ;W[pb]
 ;B[mb]LB[pa:b][rd:a]C[White continues with 'a' or 'b'. White 2 is a tough move resulting in continued fighting.]
 (;W[rd]
 ;B[re]
 ;W[mc]
 ;B[nb]
 ;W[lb]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[pa]
 ;B[ra]
 ;W[ma]
 ;B[qb]
 ;W[na]
 ;B[sb]
 ;W[nc])
 (;W[pa]C[White 2 is a strong answer.]
 ;B[lb]
 ;W[rd]
 ;B[re]
 ;W[jb]C[Future prospects are uncertain.]))
 (;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[nd]
 ;B[qb]
 ;W[qe]
 ;B[rc]
 ;W[og]LB[pf:a]C[Black can save his stones with 'a', but the three center stones are adrift.]))
 (;W[kg]LB[kf:A][nh:B]C[Black can cut at 'a'. Sometimes simply playing 'b' is enough.]
 (;B[kf]LB[kd:a][je:b]C[White continues with 'a', or 'b' if the ladder is favorable.]
 (;W[kd]C[White 16 if White does not have the ladder.]
 ;B[jf]
 ;W[kh]
 ;B[nh])
 (;W[je]C[White 16 if White has the ladder.]
 ;B[nh]
 ;W[jf]))
 (;B[nh]
 ;W[jf])))
 (;B[nh]
 ;W[lg]
 ;B[mh]C[
 * Joseki *])
 (;B[mh]C[Black 13 is too mild.]
 ;W[qc]
 ;B[rc]
 ;W[pc])
 (;B[]LB[qc:b][nh:a]C[Black plays elsewhere. White continues with 'a' or 'b'.]
 (;W[nh]
 ;B[oc]
 ;W[nc]
 ;B[ob])
 (;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[nh]
 ;W[lg]
 ;B[og]
 ;W[mi]))))
 (;B[nc]C[White 7 is an old pattern, no longer considered joseki.]
 ;W[nd]
 ;B[oc]LB[mc:b][pd:a]C[White continues with 'a'. White 'b' is too mild.]
 (;W[pd]
 ;B[pc]
 ;W[qe]C[White 12 is a sacrifice manoeuvre.]
 ;B[qf]
 ;W[re]
 ;B[rd]
 ;W[rf]
 ;B[qg]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[mc]
 ;B[mb]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[lb]
 ;B[qa]LB[pf:b][og:a]C[White continues at 'a', or if the ladder is favorable, at 'b'.]
 (;W[og]
 ;B[pf]
 ;W[qh]
 ;B[rg]
 ;W[rh]LB[of:a][pg:b]C[White ends in gote, but has powerful thickness, plus forcing moves at 'a' and 'b'.])
 (;W[pf]C[White must have the ladder to play this way.]
 ;B[of]
 ;W[og]LB[nf:b][pg:a]C[Black continues at 'a' or 'b'.]
 (;B[pg]
 ;W[nf]
 ;B[pf]
 ;W[oh]
 ;B[rg]
 ;W[rh]
 ;B[qh]
 ;W[qi]
 ;B[ri]
 ;W[qj])
 (;B[nf]
 ;W[pg]LB[mf:a][qh:b]C[White 'a' and 'b' are miai.])))
 (;W[mc]C[White 10 is not recommended, as it is not severe enough.]
 ;B[pd]
 ;W[ic]C[The result favors Black.]))
 (;B[]LB[qc:B][ng:A]C['a' is usual, 'b' is possible, a ladder is helpful here.
+]
 (;W[ng]
 ;B[pg])
 (;W[qc]LB[pc:A][rc:B]C['a' was considered disadvantageous, but Wu Qingyang v. Go Seigen changed the opinion.
 'b' is necessary if Black already has an extension on the right side.
+]
 (;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[nd]
 ;B[qb]
 ;W[qe]
 ;B[rc]
 ;W[rd]
 ;B[qc]
 ;W[pf]
 ;AW[dp]
 ;B[fp]
 ;W[of]
 ;B[dn]C[Even if White has the ladder, the result is good for Black.
 ])
 (;B[rc]
 ;W[pc]LB[rb:A][re:B]C['a' or 'b' are ok.
+]
 (;B[rb])
 (;B[re])))))
 (;W[qc]LB[pc:A][nd:B]C['a' is ok, 'b'.]
 (;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[nd]
 ;B[qb]
 ;W[qe]
 ;B[rc]
 ;W[rd]
 ;B[qc]LB[of:b][pf:a]C[White continues with 'a' or 'b', depending on the ladder. If the ladder to the lower left favors White, White plays 'a'. If the ladder is unfavorable, White plays 'b'.]
 (;W[pf]C[White 16 if a favorable ladder.])
 (;W[of]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]LB[re:B][rf:A]C['a' or 'b'.]
 (;B[rf])
 (;B[re]
 ;W[rf]
 ;B[qe]
 ;W[og])))
 (;B[nd]C[If you know the follow-up, please mail it to me: kogo@waterfire.us.]))
 (;W[nf]C[White strongly favors influence and the top with White 6.]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]LB[nb:B][ob:A]C['a' is joseki, 'b' is less favorable.]
 (;B[ob]
 ;W[nb]
 ;B[oc]C[
 * Joseki *])
 (;B[nb]
 ;W[mb]
 ;W[pc]
 ;B[oc]
 ;W[na]
 ;B[pd]
 ;W[ob]))
 (;W[nd]LB[pc:a][og:b]C[White 6 is slow.
 Black 'a' is the vital point. Black 'b' is a mistake.]
 (;B[pc]LB[jd:b][ng:a]C[White continues with 'a' in preference to 'b'.]
 (;W[ng]
 ;B[ph])
 (;W[jd]
 ;B[nb]C[Black 9 makes White's stones float without a territorial base.]))
 (;B[og]C[Black 1 is loose, a natural-looking move that is a mistake.]
 ;W[qc]C[White 8 is sente.]
 ;B[rc]
 ;W[pc]
 ;B[rb]
 ;W[jc])))
 (;B[of]LB[md:b][pd:a]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[qe]LB[pb:e][qc:a][kd:c][md:d][nd:b]C[Next, White 'a'is the strongest move. Other moves which give up the 3-3 point are a compromise. White 'b' is playable. White 'c' is the standard move at top. White 'd' does not give a favorable result. White 'e' is an old pattern.]
 (;W[qc]LB[rc:c][nd:a][qg:b]C[Black continues with 'a' to 'c'. The cut at 'a' is natural, while 'b' avoids complications and takes sente, but can also be seen as backing down from the original challenge.]
 (;B[nd]LB[nc:a][md:b]C[White 'a' is joseki. White 'b' is unreasonable.]
 (;W[nc]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[lc]
 ;B[kd]
 ;W[pe]
 ;B[pf]
 ;W[qf]LB[rc:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[pb]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[rb]LB[jb:a][ng:b]C[White continues with 'a' or 'b'.]
 (;W[jb]
 ;B[nf])
 (;W[ng]
 ;B[nf]
 ;W[mf]LB[me:a][mg:b]C[Black continues with 'a' or 'b'.]
 (;B[me]
 ;W[mg]
 ;B[kc]
 ;W[kb]
 ;B[jb]
 ;W[la])
 (;B[mg]LB[mf:28][og:A][mh:B]C['a' fights with 28. 'b' sacrifices 28 to strengthen the right side.
+]
 (;W[og]
 ;B[me]
 ;W[lf]
 ;B[kc]
 ;W[kb]
 ;B[jb]
 ;W[la]
 ;B[mh]
 ;W[kg])
 (;W[mh]
 ;B[lg]
 ;W[og]
 ;B[me]))))
 (;B[qg]
 ;W[rf]
 ;B[ph]LB[jc:b][rd:a]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[kc])
 (;W[jc]
 ;B[pc]
 ;W[oc]
 ;B[rc]
 ;W[qb]
 ;B[re]
 ;W[rb]
 ;B[rg])))
 (;W[md]C[White 10 is a mistake.]
 ;B[nc]
 ;W[mc]LB[mb:c][nb:b][ob:a]C[Black continues with 'a'. If Black 'b', White plays 'c', and the unreasonable move of White 10 succeeds.]
 ;B[ob]
 ;W[pb]
 ;B[mb]C[White is at a loss for how to proceed.]))
 (;B[qg]
 ;W[pb]LB[rc:a][nd:b]C[White 10 is correct shape, guarding against 'a' and 'b'.])
 (;B[rc]
 ;W[pb]
 ;B[qb]
 ;W[pc]
 ;B[rb]
 ;W[md]
 ;B[qg]))
 (;W[nd]C[White 8 is possible, but not often seen in actual play.]
 ;B[qc]
 ;W[jc]C[The position of White 10 is flexible, depending on the situation in the top-left corner.])
 (;W[kd]
 ;B[qc]LB[ob:a]C[White ignores Black 9 and plays elsewhere. This pattern is sometimes seen in professional games, but Black has the move at 'a', so White undeniably seems thin.])
 (;W[md]LB[nc:A][mg:B]C[White 8 is not recommended.
 'a' is usual, 'b' keeps a moyo, which is already on the right side.]
 (;B[nc]
 ;W[nd]
 ;B[qc]LB[pb:a]C[White has no good followup. White 'a', keeping the peep stone separated from the others, does not give White good shape.]
 ;W[pb]
 ;B[mb]
 ;W[ob]
 ;B[kc])
 (;B[mg]))
 (;W[pb]C[White 8 is an old pattern.]
 ;B[qc]
 ;W[lc]))
 (;W[md]
 ;B[pd]
 ;W[oc]
 ;B[pj]
 ;W[ic]))
 (;B[nd]LB[nc:B][pe:A]C['a' is correct, 'b' is getting tricked.]
 (;W[pe]
 ;B[of]
 ;W[nc]LB[md:B][pd:A]C['a' is correct. 'b' is a mistake.]
 (;B[pd]
 ;W[md]
 ;B[pg]
 ;W[pc]
 ;B[qc]
 ;W[nf]
 ;B[oh]C[Black's attempt not to fall behind in influence failed.]
 ;W[id])
 (;B[md]
 ;W[pd]))
 (;W[nc]
 ;B[md]
 ;W[pe]
 ;B[pd]
 ;W[of]
 ;B[oc])))
 (;W[nd]
 ;B[pd]
 ;W[ne]
 ;B[of]
 ;W[jc])
 (;W[qc]LB[rc:d][nd:a][pd:c][pe:b]C[White 4 is an attempt to complicate the situation, and can lead to undreamed-of variations.
 Black responds with 'a', 'b' or 'c'. Black 'a' is usual.
 Black 'b' is also easy to understand.
 Black 'c' is a scary move leading to complications, and a serious loss of territory in the corner for White if Black has a favorable ladder.
 Black 'd' does not appear in joseki books.]
 (;B[nd]LB[oc:b][pc:c][pd:a]C[Old fashioned.
 White continues with 'a'.
 White 'b' is submissive.
 White 'c' is heavy.]
 (;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[rd]LB[rc:a][re:b]C[White continues with 'a'. White 'b' is a trick play.]
 (;W[rc]LB[ob:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ob]LB[pc:b][re:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]
 ;B[pc]
 ;W[sd]
 ;B[qd]CR[rd]LB[qh:a][dp:b]C[White continues at 'a'. White playing at the red dot would be pointless.
 White can play elsewhere ('b').]
 (;W[qh]C[
 * Joseki *
 Most professionals think that White is favorable, so recently it's hard to meet this joseki])
 (;W[]LB[rg:b][ph:a]C[White plays elsewhere. Black continues with 'a', or 'b' if the position merits taking the right side.]
 (;B[ph]LB[rg:a][cq:b]C[Black forces White low at 'a'. White plays elsewhere with 'b' (not recommended, but White can live).]
 (;W[rg]C[White aims to cut later.]
 ;B[dd]C[Black plays elsewhere.]
 ;W[pf]C[White's continuation.]
 ;B[of]
 ;W[pg]
 ;B[og]
 ;W[oh]C[The cut White was aiming at.])
 (;W[]C[White plays elsewhere.]
 ;B[rg]
 ;W[pb]
 ;B[oc]
 ;W[qa]C[White lives (barely) in the corner, but the result is a big loss locally.]))
 (;B[rg]C[Black 17 emphasizes territory on the right side.]
 ;W[qg]
 ;B[qh]
 ;W[pf]
 ;B[ph]
 ;W[of]
 ;B[ne]))
 (;W[dp]
 ;B[ph]
 ;W[rg]C[White's group can still survive.]))
 (;W[pc]C[White 12 is a mistake.]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[sd]
 ;B[ne]))
 (;B[qf]C[Black 11 is resourceless.]
 ;W[re]
 ;B[rf]
 ;W[sd]
 ;B[ne]C[Connecting in gote is not good enough.]))
 (;W[re]
 ;B[rc]
 ;W[qb]LB[rb:b][qf:a]C[Black 'a' foils the trick play. Black 'b' is a mistake.]
 (;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[pf]
 ;W[rh]
 ;B[pg]
 ;W[qh]
 ;B[ob]
 ;W[pc]
 ;B[rb])
 (;B[rb]C[Black 13 is a mistake.]
 ;W[ob]C[The four black stones can be captured.])))
 (;W[oc]LB[nc:A][pe:B]C[Black 6 is submissive.
 'a' is correct, 'b' is questionable.]
 (;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[na]
 ;W[ob]
 ;B[ne])
 (;B[pe]LB[pb:A][rc:B]C['a' is correct. 'b' is a mistake.]
 (;W[pb]
 ;B[mf])
 (;W[rc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[ne])))
 (;W[pc]C[White 6 is not recommended.]
 ;B[ne]LB[nc:b][pe:a]C[Black 7 is simple: Black goes for influence. White may try 'a' or 'b'.]
 (;W[pe]
 ;B[pf])
 (;W[nc]
 ;B[mc])))
 (;B[pe]LB[pc:b][nd:a]C[Outdated joseki
 White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[ne]
 ;W[md]
 ;B[rc]
 ;W[pc]LB[rb:b][qj:a]C[Black continues with 'a' or 'b'.]
 (;B[qj]LB[rb:b][ic:a]C[
 * Joseki *
 White continues with 'a' or 'b' or elsewhere.]
 (;W[ic])
 (;W[rb]))
 (;B[rb]
 ;W[ic]))
 (;W[pc]C[White 6 is a mistake.]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[kc]
 ;B[qj]C[White is much worse off than the joseki variation.]))
 (;B[pd]C[Black 5 is a strong move. White better have the ladder or is in serious trouble.]
 ;W[pc]LB[oc:A][nd:C][ne:B]C['a' is correct, 'b' and 'c' are possible.]
 (;B[oc]
 ;W[nd]LB[ob:B][nc:A]C['a' makes two groups on both sides, while White gets a small corner and a running center group.
 'b' gives the top side in gote for a big wall. 'b' punishes if White doesn't have the ladder.]
 (;B[nc]
 ;W[mc]
 ;B[mb]
 ;W[md]LB[lb:A][pb:B]C['a' is correct, 'b' doesn't work.
 C is another good option]
 (;B[lb]
 ;W[rd]
 ;B[re]
 (;W[rc]
 ;B[qe]LB[ob:B][pb:A]C['a' or 'b' give the same result.]
 (;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 (;W[rb]
 ;B[kd]
 ;W[mf]C[The result is better for Blacks])
 (;W[kc]C[White wants to push here, but it is an overplay.]
 ;B[lc]
 ;W[ld]
 ;B[kd]C[White is in trouble!]))
 (;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[kd]
 ;W[mf]))
 (;W[rb]
 ;B[sd]
 ;W[sc]
 ;B[rc]
 ;W[nb]
 ;B[ob]
 ;W[rd]
 ;B[ld]
 ;W[pb]
 ;B[na]
 ;W[se]
 ;B[me]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[ne]
 ;W[rf]
 ;B[lc]C[Joseki]))
 (;B[pb]
 ;W[qb]
 ;B[ob]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[lb]
 ;B[na]
 ;W[pa]
 ;B[sb]
 ;W[qa]
 ;B[oa]
 ;W[la])
 (;B[ob]C[Rare plan, invented by Igor Burnaevsky (Russia).]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qf]
 ;W[lb]
 ;B[rc]
 ;W[pg]C[The result is equal]))
 (;B[ob]
 ;W[rd]LB[rc:b][re:a]C[Black continues with 'a' if a favorable ladder, or 'b' if the ladder is unfavorable.]
 (;B[re]C[Black must have the ladder to play this way.]
 ;W[rc]
 ;B[qe]LB[mc:b][nc:a]C[White plays 'a' if the ladder is favorable to White, but must play 'b' if the ladder is unfavorable.]
 (;W[nc]C[White 14 only works if White has the ladder.]
 ;B[nb]
 ;W[mb]
 ;B[mc]
 ;W[lb]LB[lc:B][md:C][me:A]C[Black plays 'a' if he doesn't have the ladder, starting at 'b' or 'c'.
+]
 (;B[me]
 ;W[md]
 ;B[ld]
 ;W[lc]
 ;B[ne]
 ;W[mc]
 ;B[kd])
 (;B[lc]
 ;W[pb]
 ;B[ne])
 (;B[md]
 ;W[ne]
 ;B[nf]))
 (;W[mc]C[White must play 14 here if the ladder favors Black, but the White corner stones die. White gets some thickness at top as compensation, but the result clearly favors Black.]
 ;B[pb]LB[qb:A][ne:B]C['a' or 'b'.]
 (;W[qb]
 ;B[mb]
 ;W[lb]
 ;B[nb]
 ;W[lc]
 ;B[ra]
 ;W[qa]C[This is no help.]
 ;B[sd]C[White cannot live, and Black wins the fight.]
 ;W[nc]
 ;B[sc]
 ;W[sb]
 ;B[se]
 ;W[ma]
 ;B[pa])
 (;W[ne]
 ;B[mb]
 ;W[lb]
 ;B[nb]
 ;W[of]
 ;B[qh]
 ;W[kc])))
 (;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[pb]
 ;W[rc]
 ;B[qf]LB[mc:b][re:a]C[White continues with 'a' or 'b'.]
 (;W[re]
 ;B[ne]
 ;W[md]
 ;B[lc]C[The future is uncertain.])
 (;W[mc]LB[mb:b][re:a]C[Black continues with 'a' or 'b'.]
 (;B[re]
 ;W[ne]
 ;B[ra]
 ;W[of]
 ;B[qg])
 (;B[mb]
 ;W[lb]
 ;B[nc]
 ;W[md]
 ;B[na]
 ;W[re]
 ;B[pg]
 ;W[rf]
 ;B[rg]
 ;W[ra]LB[lc:a]C[Both sides make live groups in the corner. The Black cut at 'a' necessitates a favorable White ladder, or White faces a tough fight.])))))
 (;B[ne]LB[nc:A][oc:C][nd:B]C['a' is correct, 'b' is rare.
 'c' is possible.]
 (;W[nc]LB[mc:C][ld:A][re:B]TR[qk]C['a' is a recent Korean invention enabling Black to play the extension to his wall.
 'b' fears the White cut, but is possible, 'c' is an old variation pressing White down. It's very nice with an additional Black stone on or near the triangled point. Without it, it's a mistake, because White will take away the extension from the wall.
+]
 (;B[ld]LB[lb:A][pe:B]C['a' is correct. After 'b', White is enclosed.]
 (;W[lb]
 ;B[qk])
 (;W[pe]LB[rd:B][pf:A]C['a' takes influence for a White corner with weaknesses.
 'b' takes influence or starts a fight.]
 (;B[pf]
 ;W[qe]
 ;B[rd]
 ;W[rf]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pb]
 ;B[ra]
 ;W[sb]
 ;B[qh]
 ;W[re]
 ;B[mc]LB[pa:B][nd:A]C[Later, Black can enclose White with 'a'.]
 ;B[nd]
 ;W[oc]
 ;B[nb]LB[pa:A]C[Threat of a flower viewing ko on 'a'.]
 ;W[qa])
 (;B[rd]LB[qe:A][pf:B]C['a' takes territory.
 'b' is experimental and starts a fight.]
 (;W[qe]
 ;B[rf]LB[re:A][qg:B]C['a' gives Black thickness.
 'b' is experimental.]
 (;W[re]
 ;B[nd]LB[oc:A][rc:B]C['a' gives Black thickness to the right, 'b' to the top.]
 (;W[oc]
 ;B[pf]
 ;W[rc]
 ;B[qf]
 ;W[sd])
 (;W[rc]LB[oc:A][sd:B]C['a' is correct. 'b' is a mistake.]
 (;B[oc]
 ;W[sd]
 ;B[od]
 ;W[qg]LB[qi:A]C[Later Black 'a'.])
 (;B[sd]
 ;W[oc]
 ;B[pf]
 ;W[sc]
 ;B[qf]
 ;W[se]LB[rh:A]C[Later White 'a' is possible.])))
 (;W[qg]
 ;B[qf]
 ;W[pf]
 ;B[pg]
 ;W[of]
 ;B[re]
 ;W[ph]
 ;B[nd]
 ;W[oc]
 ;B[og]
 ;W[nf]
 ;B[qh]
 ;W[ng]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[le]))
 (;W[pf]
 ;B[rc]
 ;W[lb]
 ;B[qb]
 ;W[pb]
 ;B[qa]
 ;W[kc]
 ;B[og]
 ;W[pg]
 ;B[oh]
 ;W[ph]
 ;B[oi]
 ;W[re]
 ;B[pi]
 ;W[sd]))))
 (;B[re]
 ;W[kc])
 (;B[mc]
 ;W[mb]LB[lc:A][nd:B]C['a' or 'b'.]
 (;B[lc]
 ;W[nd]
 ;B[me]
 ;W[lb]
 ;B[jc]LB[pe:A]C[White A is only endgame.]
 ;W[qk])
 (;B[nd]
 ;W[oc]
 ;B[lc]
 ;W[lb]LB[jc:B][kc:A]C['a' or 'b'.]
 (;B[kc]
 ;W[qk])
 (;B[jc]
 ;W[kc]
 ;B[kd]
 ;W[kb]
 ;B[jd]LB[pe:B][qk:A]C['a' takes the extension away from the wall, 'b' is endgame.]
 (;W[qk])
 (;W[pe]C[The cut is only an endgame move.]
 ;B[pf]
 ;W[qe]
 ;B[rd]LB[qf:B][rf:A]C[Neither 'a' nor 'b' help.]
 (;W[rf]
 ;B[qf]
 ;W[re]
 ;B[rg]
 ;W[rc]
 ;B[qh])
 (;W[qf]
 ;B[qg]
 ;W[pg]LB[of:A][rf:B]C['a' or 'b' are good.]
 (;B[of]
 ;W[rg]
 ;B[qh]
 ;W[re]
 ;B[se]
 ;W[rf]
 ;B[rh]
 ;W[rc]
 ;B[oi])
 (;B[rf]
 ;W[of]
 ;B[re]
 ;W[pf]
 ;B[qh]
 ;W[nf]
 ;B[md]
 ;W[ni]
 ;B[qk])))))))
 (;W[nd]C[It helps White to get sente]
 ;B[md]
 ;W[mc]
 ;B[lc]
 ;W[nb]
 ;B[mb]
 ;W[nc]
 ;B[ld]C[Locally Black is better, but White keeps sente.]))
 (;B[nd]
 ;W[oc]LB[nc:B][pf:A]C[A is rare. 'b' is more common]
 (;B[pf]C[Rare]
 (;W[ne]
 ;B[md]
 ;W[nf]
 ;B[nb]
 ;W[nc]
 ;B[mc]
 ;W[ob]
 ;B[ph]
 ;W[lf]
 ;B[id])
 (;W[mb]C[Good enough for White.]))
 (;B[nc]
 (;W[ne]C[Wrong order.]
 (;B[of]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]
 ;W[me]
 ;B[lc]
 ;W[ld]
 ;B[mb]
 ;W[nb]
 ;B[mc])
 (;B[rd]C[Correct punishment.]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 (;B[lc]
 ;W[rc]
 ;B[of]C[Good result for Black.])
 (;B[ld]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kb]
 ;W[ma]
 ;B[kd]
 ;W[pe]
 ;B[of]
 ;W[pf]
 ;B[pg]
 ;W[og]
 ;B[nf]
 ;W[qg]
 ;B[ph]
 ;W[qf]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[sg]
 ;B[pj]
 ;W[re]C[Surin (W) vs Dinerchtein, 2012. Result is equal.])))
 (;W[rd]
 ;B[re]
 ;W[ne]C[Correct order]
 ;B[of]
 ;W[rc]
 ;B[qf]LB[me:A][nf:B]C[Here White may consider 'a' or 'b'.]
 ;W[me]
 ;B[lc]
 ;W[ld]
 ;B[mb]
 ;W[nb]C[Very complicated joseki, with many long variations of 50+ moves.]
 ;B[ob]
 ;W[pe]
 ;B[qe]
 ;W[mc]
 ;B[na]
 ;W[md]
 ;B[nb]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jb]
 ;W[jc]
 ;B[kd]
 ;W[ib]
 ;B[ke]
 ;W[nf]
 ;B[pb]
 ;W[qb]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[ka]
 ;B[sd]
 ;W[ma]
 ;B[la]
 ;W[og]
 ;B[ja]
 ;W[pf]C[From Korean Go book. White is favorable])))
 (;B[md]
 ;W[oc]
 ;B[ne]C[Rare joseki]))
 (;B[rc]LB[pc:A][pd:B][rd:C]C[Black 5 does not appear in joseki books.
 As a reply, White 'a' is possible.
 'b' gives huge influence for a small corner.
 'c' is a mistake.]
 (;W[pc]
 ;B[re]
 ;W[ne]
 ;B[of]
 ;W[qf]
 ;B[pd]
 ;W[nd]
 ;B[qi]
 ;W[jc])
 (;W[pd]
 ;B[pe]
 ;W[rd]
 ;B[qe]
 ;W[rb]
 ;B[pc]
 ;W[sc]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mf])
 (;W[rd]LB[qe:B][re:A]C[Black punishes by making the corner a favorable ko on 'a' or by taking huge influence on 'b'.]
 (;B[re]
 ;W[pd]
 ;B[qe]
 ;W[rb]LB[pc:A][sd:B]C['a' attacks the corner, 'b' builds influence to the right side.]
 (;B[pc]
 ;W[sc]
 ;B[qb]
 ;W[rc]
 ;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[mc]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[na]
 ;B[se]
 ;W[sa]
 ;B[sb])
 (;B[sd]
 ;W[pb]
 ;B[pe]
 ;W[nd]
 ;B[pj]))
 (;B[qe]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[re]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[md]))))
 (;W[pe]C[White 4 is not joseki, but there are many possible variations, and the surrounding situation may be a factor.]
 ;B[pd]
 ;W[pf]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[nb]
 ;W[qb]
 ;B[ob]
 ;W[pc]
 ;B[rc]
 ;W[rb]
 ;B[rf]
 ;W[rg]
 ;B[re]LB[sb:b][qg:a]C[White 'a' seals Black in on the right, and is the best White can do. White 'b', Black 'a', and White still cannot make life.])
 (;W[pd]C[Pushing your head against the wall is a basic mistake.]))
 (;B[mc]LB[ob:b][qc:a][md:c][pd:g][ne:d][qe:h][pf:f][dp:e]TR[jd]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 White responds with 'a' to establish a group or 'b' to seperate Black.
 White likes to have support in the lower right for 'b'.
 White 'c' isn't good among ususal circumstances. Its purpose is to prevent a Black moyo on the top side and occupy the triangled position.
 White 'd' was considered joseki a long time, but is now considered an inferior variation.
 White rarely ignores the pincer (variation 'e').
 In some fuseki, the usual joseki are no help, and only 'f' is correct.
 'g' is inferior attempt to enforce a position on the outside.
 White 'h', the outside attachment, is inferior.
 e5, d4, c3, b2, a1
 Outcomes:
 a1 - Black choice of corner, top or right, plus trick plays
 d4 - Black choice of top or right
 c3 - Black choice of top or corner
 b2 - Black corner & choice of top or left
 e5 - Black choice of top or right
 h - Black large corner, White right
+]
 (;W[qc]LB[jc:d][pc:a][rc:b][pd:c]C[The aim of White 4 is to settle the position promptly, but Black may have other plans.
 Black responds with 'a', 'b' or 'c'.
 Black 'a' aims for the top side although other results are possible, too. It also offers some fine trick plays for Black.
 Black 'b' does settle the position, with Black taking the right, White out to the center toward the top (but with Black aji from the pincer).
 Black 'c' is similar to 'a' in the type of results and difficulty. As it offers a chance for a mistake for weak players, it is traditionally regarded as a trick play, although that is not a much important point about it. Black must have the ladder to play this way.
 Black 'd' is at best a special strategy, but not joseki.]
 (;B[pc]
 ;W[pd]LB[qb:b][oc:a]C[Black 'a' is joseki.
 Black 'b' is a trick play, but Black comes out well from it even
 if White is not tricked.]
 (;B[oc]
 ;W[nc]LB[nb:b][qb:c][nd:a]C[Black continues with 'a' or 'b'. 'c' is a trick play.]
 (;B[nd]LB[nb:a][qe:b]C[White continues with 'a'. White 'b' is strange, and has numerous variations.]
 (;W[nb]
 ;B[qb]
 ;W[rc]
 ;B[ob]LB[mb:b][ne:c][qe:a]C[White continues with 'a' or 'b'. White must have the ladder to play 'b'.
 White will choose 'a' if the right side is important, 'b' if the top side is more interesting.
 'c' is a mistake.]
 (;W[qe]LB[mb:a][rb:b]C[Black continues with 'a' or 'b'.
 With 'a' he aims for the top side, with 'b' he tries to take the right side, but cannot force White to give it.]
 (;B[mb]
 ;W[ne]
 ;B[md]LB[rb:E][oe:A][nf:C][of:D][ng:B]C[
 * Joseki *
 The sequence is joseki because White has sente.
 White has no influence, because Black has continuations on 'a' and 'b'.
 White center continuations on 'c' or 'd' are more urgent than the endgame on 'e'.
+]
 (;B[oe]
 ;W[pe]
 ;B[of]LB[qf:B][qg:A]C[This move is sente. White must answer on 'a' or Black attacks on 'b'.]
 (;W[qg])
 (;B[qf]LB[re:A]C[White defends on 'a' or Black kills on 'a'.]
 (;W[re]
 ;B[pf])
 (;B[re]
 ;W[rd]
 ;B[pf]
 ;W[qd]
 ;B[rf])))
 (;B[ng]LB[oe:A]C[White can push into the center, because of his weakness on 'a'.])
 (;W[nf])
 (;W[of]))
 (;B[rb]LB[oa:a][rd:b]C[Black tries a forcing move.
 White continues with 'a' to consent into Black's plan of furikawari and trade the right for the top side.
 For White to play 'b' is locally disadavantageous. On the other hand, it is the only possibility to resist Black's strategy to take the right side and give up the top side, and sente.]
 (;W[oa]
 ;B[pb]
 ;W[mb]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[lc]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[ne]
 ;B[qg])
 (;W[rd]C[White 14 is submissive and not joseki.]
 ;B[md]TR[ne]C[This is not joseki, because White did not get a stone on the triangled position.])))
 (;W[mb]LB[md:b][ne:c][qe:a]C[White must have the ladder to play this way.
 Black plays 'a' if the ladder favors White, 'b' if Black has the ladder (and the game is over).
 'c' is a trick play.]
 (;B[qe]
 ;W[pf]
 ;B[rb]
 ;W[lc]LB[md:a][pe:b]C[Black continues with 'a' or 'b'. 'a' leads to fighting, while 'b' gives settled shapes.]
 (;B[md]
 ;W[ld]LB[mf:A][nf:B]C['a' is correct. 'b' is a mistake.
+]
 (;B[mf]LB[oa:b][pe:a]C[White continues with 'a' or 'b'. There is no real difference between the two variations.]
 (;W[pe]
 ;B[le]
 ;W[oa]
 ;B[pb]
 ;W[qf]LB[kb:B][rd:A]C['a' is joseki, 'b' is a trick play.]
 (;B[rd]
 ;W[re]
 ;B[sc]
 ;W[jd]
 ;B[ke]LB[hc:A][id:B]C['a' is the usual variation for just creating a living group in good shape. 'b' is a continuation with support in the upper left corner.]
 (;W[hc]C[
 * Joseki *]
 ;B[pi]
 ;W[oh]LB[nf:A]C[Later, 'a' is a good point for White.])
 (;AW[dc][de]
 ;W[id]))
 (;B[kb]
 ;W[lb]
 ;B[jd]LB[sc:A][re:B]C['a' is correct, 'b' is getting tricked.]
 (;W[sc]
 ;B[sb]
 ;W[re]
 ;B[kd]LB[na:A][pa:B]C['a' is correct. 'b' is a mistake.]
 (;W[na]
 ;B[la]
 ;W[pa]
 ;B[kc]
 ;W[qa]
 ;B[ka]
 ;W[ra]
 ;B[ma]
 ;W[sa])
 (;W[pa]
 ;B[na]
 ;W[ma]
 ;B[ra]
 ;W[na]
 ;B[kc]))
 (;W[re]
 ;B[sc]
 ;W[rd]
 ;B[kd]LB[na:B][sb:A]C[Neither 'a' nor 'b' work.]
 (;W[sb]
 ;B[sa]
 ;W[pa]
 ;B[na]
 ;W[ma]
 ;B[kc]
 ;W[qa]
 ;B[ka]
 ;W[sd]
 ;B[la]
 ;W[sb]
 ;B[na]
 ;W[ra]
 ;B[sa]
 ;W[ra])
 (;W[na]
 ;B[la]
 ;W[pa]
 ;B[kc]
 ;W[qa]
 ;B[ra]))))
 (;W[oa]LB[en:013][co:08][do:010][eo:011][cp:01][dp:09][ep:02][fp:012][gp:06][jp:07][dq:05][eq:03][fq:04]C[This variation is from Sakata Eio (White) against Fujisawa Shuko = Fujisawa Hideyuki (Black) in the 4th game of the 1963 Meijin Title. The joseki in the lower right is numbered with prefixed zeros.]
 ;B[pb]
 ;W[pe]
 ;B[le]
 ;W[qf]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[jd]
 ;B[ke]
 ;W[hd]
 ;B[pi]
 ;W[oh]
 ;B[ph]
 ;W[og]
 ;B[qm]
 ;W[oi]
 ;B[pj]
 ;W[kh]
 ;B[if]
 ;W[ih]
 ;B[fc]
 ;W[gf]
 ;B[hg]
 ;W[fh]
 ;B[gg]
 ;W[fg]
 ;B[ff]
 ;W[he]
 ;B[ji]
 ;W[ed]
 ;B[ef]
 ;W[dg]
 ;B[eg]
 ;W[eh]
 ;B[cg]
 ;W[di]
 ;B[df]
 ;W[ch]))
 (;B[nf]
 ;W[pe]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[qf]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[kf]
 ;B[lg]
 ;W[qj]
 ;B[kd]
 ;W[jd]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jb]
 ;B[ma]))
 (;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[pg]C[
 * Joseki *]
 ;W[mf]))
 (;B[md]C[Black has the ladder and White has lost.]
 ;W[oa]
 ;B[pb]
 ;W[rb]
 ;B[pe])
 (;B[ne]
 ;W[oa]
 ;B[pb]
 ;W[qe]
 ;B[rb]LB[lc:A][rd:B]C['a' is correct. 'b' is a mistake.]
 (;W[lc]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[of]
 ;B[le]
 ;W[ic]
 ;B[mg]
 ;W[pi])
 (;W[rd]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[jb]
 ;B[kc]
 ;W[ka]
 ;B[la]
 ;W[ja]
 ;B[pa]
 ;W[ma]
 ;B[na]
 ;W[la]
 ;B[ic]
 ;W[jc]
 ;B[jd]
 ;W[kd]
 ;B[ib]
 ;W[oa]
 ;B[ia])))
 (;W[ne]
 ;B[md]
 ;W[qe]LB[mb:A][ne:14][qe:16]C[Black does not have to play on A, because White played 14 and 16 in the wrong order. Black gets sente, so this is not joseki.]))
 (;W[qe]LB[nb:a][rd:b]C[White 10 is odd.
 Black can keep things simple with 'a', though perhaps giving White a slightly favorable result. Alternately, Black extends at 'b'.]
 (;B[nb]C[Black 11 is simple.]
 ;W[rd])
 (;B[rd]LB[qb:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]
 ;B[nb]LB[pe:b][re:a]C[White 'a' or 'b' are possible continuations.]
 (;W[re]LB[oe:a][pe:b]C[Black 'a' or 'b' are possible continuations that improve Blacks local position.])
 (;W[pe]C[White 14 gives bad shape.]))
 (;W[qb]
 ;B[nb]LB[re:a][pf:c][qf:b]C[White continues with 'a'. White 'b' and 'c' are not recommended.]
 (;W[re]
 ;B[ne]
 ;W[pe]C[White 16 is the most solid continuation. The result favors Black.])
 (;W[qf]C[White 14 gives terrible aji.]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg])
 (;W[pf]C[White 14 gives bad shape and leaves aji.])))))
 (;B[nb]LB[nd:b][qe:a]C[White continues with 'a'. White 'b' if the ladder doesn't work, but that is not joseki.]
 (;W[qe]LB[nd:B][rd:A]C['a' is joseki, 'b' is variation.]
 (;B[rd]
 ;W[nd]LB[pb:A][re:B]C['a' keeps the top side and is usual, 'b' goes to the right and is good for White locally.]
 (;B[pb]
 ;W[re]
 ;B[rc]
 ;W[md]
 ;B[lc]
 ;W[qj]C[
 * Joseki *])
 (;B[re]
 ;W[mb]
 ;B[ob]LB[lb:B][lc:A]C['a' with the ladder, 'b' without.]
 (;W[lc]
 ;B[qb]
 ;W[md])
 (;W[lb]
 ;B[qb]
 ;W[ld])))
 (;B[nd]
 ;W[rd]))
 (;W[nd]LB[pb:B][qe:A]
 (;B[qe]LB[mb:a][qb:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[mb]
 ;B[ob]
 ;W[lb]
 ;B[qb]
 ;W[ld]C[If White could catch Black 3 in a ladder, the ponnuki shape would be an equal result. The geta is less favorable.])
 (;W[qb]C[White 12 is a mistake. White cannot live in the corner.]
 ;B[ob]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[rb]C[Withe the tesuji of 17, White dies in the corner.]))
 (;B[pb]C[Black 11 is not recommended. White gets great thickness.]
 ;W[qe]
 ;B[rd]
 ;W[md]
 ;B[lc]
 ;W[re]
 ;B[rc]
 ;W[pj])))
 (;B[qb]LB[rc:B][nd:A]C['a' is correct, 'b' is getting tricked.]
 (;W[nd]LB[nb:B][rc:A]C['a' or 'b'.]
 (;B[rc]
 ;W[mb]C[Joseki])
 (;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[qe]
 ;B[rc]
 ;W[lc]))
 (;W[rc]
 ;B[nb]
 ;W[nd]
 ;B[qe]
 ;W[mb]
 ;B[ob]
 ;W[lc])
 (;W[nb]
 ;B[rc]
 ;W[md]C[Joseki])))
 (;B[qb]C[Black 7 is a trick play, but Black gets a reasonable result even if White is not tricked.]
 ;W[rc]LB[rd:b][qe:a]C[Black 'a' and 'b' are both possible.]
 (;B[qe]LB[pb:a][nc:c][oc:b]C[White 'a' is correct. White takes the top, Black the corner and right.
 White 'b' is a mistake, and White 'c' only slightly better.]
 (;W[pb]
 ;B[oc]LB[rb:b][nc:a]C[White 'a' is correct. White 'b', grimly clinging to the corner, is a mistake.]
 (;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[md]
 ;B[oe]
 ;W[jd]LB[rb:a][dp:b]C[Black must play at 'a' later. Playing elsewhere ('b') results in a "flower-viewing" two-step ko for White.]
 (;B[rb]C[Black 19 is necessary.])
 (;B[]C[Black plays elsewhere. The Black corner stones can only live by ko.]
 ;W[rb]
 ;B[ra]
 ;W[na]
 ;B[oa]
 ;W[sa]
 ;B[sb]
 ;W[sc]C[A ko ensues.]))
 (;W[rb]C[White 12 is a mistake.]
 ;B[ob]
 ;W[qa]LB[nd:a][ne:b]C[Black may try 'a' or 'b'.
 Black 'a' gives black two groups (right and top).
 Black 'b' give thickness at the expense of the two Black stones (1,9).]
 (;B[nd]
 ;W[pf]LB[pe:b][pg:a]C[ Black 'a' is tesuji. Black 'b' is a mistake.]
 (;B[pg]LB[of:a][qf:b]C[White 'a' is correct. White 'b' is a mistake.]
 (;W[of]
 ;B[qf])
 (;W[qf]C[White 18 is a mistake.]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[rf]
 ;W[nf]
 ;B[og]
 ;W[md]
 ;B[nc]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]C[The loss of the two White stones (16,18) makes this a loss for White.]))
 (;B[pe]C[Black 17 is no good.]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[pg]
 ;W[nf]
 ;B[og]
 ;W[md]
 ;B[nc]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[jd]LB[rg:a]C[White can aim at 'a'.]))
 (;B[ne]
 ;W[nd]
 ;B[md]
 ;W[oe]
 ;B[of]
 ;W[nf]
 ;B[me]
 ;W[pf]
 ;B[og]
 ;W[pe]
 ;B[pg]
 ;W[qf]
 ;B[qg]
 ;W[rf])))
 (;W[oc]C[White 10 is a mistake.]
 ;B[pb]
 ;W[ob]
 ;B[rb]
 ;W[of]
 ;B[jc])
 (;W[nc]C[White 10 is not recommended.]
 ;B[ob]
 ;W[nb]
 ;B[rb]
 ;W[md]))
 (;B[rd]
 ;W[pb]
 ;B[oc]LB[rb:a][nc:b]C[White 'a', clinging to the corner, is a mistake.
 White best continue with 'b'.]
 (;W[rb]C[White 12 is a mistake.]
 ;B[ob]
 ;W[qa]
 ;B[nd]LB[qe:b][pf:a]C[White 'a' is the best White can do.
 White 'b' gets White sealed in (but White gets the corner), in White gote.]
 (;W[pf]
 ;B[qg]
 ;W[pg]
 ;B[qh]
 ;W[ph]
 ;B[qi]C[The result favors Black.])
 (;W[qe]C[White 16 is a mistake.]
 ;B[re]
 ;W[qf]
 ;B[of]
 ;W[pe]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[se]))
 (;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[md]
 ;B[qf])))
 (;B[rc]C[Favorite of Saijo Masataka, 8-dan.]
 ;W[qb]
 ;B[qe]
 ;W[nc]
 ;B[rb]
 ;W[md]
 ;B[pb]
 ;W[lc]C[White is slightly favorable, but Saijo, 8-dan thinks that the result is equal.]))
 (;B[rc]
 ;W[pc]LB[re:A][qg:B]C['a' is the old, 'b' the new variation.]
 (;B[re]LB[ne:a][pf:b]C[Joseki continues with White 'a'.
 White 'b' is a bit unreasonable.]
 (;W[ne]LB[kd:b][me:c][pg:a]C[Black continues with 'a'.
 Black 'b' is not joseki, as Black is pressed down on the right.
 'c' is wrong.]
 (;B[pg]
 ;W[ld]LB[kc:A][lc:B]C['a' is correct. 'b' is a mistake.]
 (;B[kc]LB[lc:A][jd:B]C['a' is correct, 'b' is also possible.]
 (;W[lc]C[Continuation.]
 ;B[lb]LB[mb:b][md:a]C[White continues with 'a' or 'b'. White needs the ladder to capture Black 11 to play 'b'.]
 (;W[md]LB[mb:C][nc:B][kd:A]C['a' is joseki, 'b' and 'c' are mistakes.]
 (;B[kd]
 ;W[mb]
 ;B[kf]LB[kb:A]C[Later, Black likes to play 'a' and shut in the group, which is not yet alive.]
 ;B[kb]
 ;B[of]
 ;B[mf]
 ;B[nc]C[The killing begins.]
 ;W[nb]
 ;B[ma]C[White is dead.])
 (;B[nc]
 ;W[mb])
 (;B[mb]
 ;W[je]))
 (;W[mb]LB[kb:b][nb:a][jc:c]C[Fujisawa Hosai 9-dan invented this. If Black 'a', White 'b' and 'c', assuming White has the ladder. This way of playing is frightening.]))
 (;W[jd]
 ;B[jc]
 ;W[id]LB[hc:B][ic:A]C['a' is correct. 'b' is a mistake.]
 (;B[ic]
 ;W[hd]LB[gc:B][hc:A]C['a' is correct. 'b' is a mistake.]
 (;B[hc]
 ;W[gd]
 ;B[fc])
 (;B[gc]
 ;W[hc]
 ;B[hb]
 ;W[lc]
 ;B[lb]
 ;W[kd]LB[fb:B][nb:A]C['a' or 'b'.]
 (;B[nb]
 ;W[gb]
 ;B[ib]
 ;W[fc])
 (;B[fb]
 ;W[mb]
 ;B[kb]
 ;W[nb])))
 (;B[hc]
 ;W[ic]C[White needs the ladder.]
 ;B[ib]
 ;W[jb]LB[hb:A][kb:B]C['a' or 'b'.]
 (;B[hb]
 ;W[lc]
 ;B[kb]
 ;W[lb])
 (;B[kb]
 ;W[hb]
 ;B[ja]
 ;W[gc]))))
 (;B[lc]
 ;W[jd]))
 (;B[kd]C[Black 9 puts Black's right side stones under pressure.]
 ;W[qf]
 ;B[qg]LB[rf:b][pg:a]C[White continues with 'a' or 'b'. White 'b' starts local fighting.]
 (;W[pg]
 ;B[rg]
 ;W[ph]
 ;B[qi]
 ;W[id])
 (;W[rf]
 ;B[rg]
 ;W[se]))
 (;B[me]
 ;W[mf]
 ;B[le]
 ;W[qf]
 ;B[qg]
 ;W[pg]
 ;B[rg]
 ;W[qh]
 ;B[ph]
 ;W[pf]
 ;B[qi]
 ;W[rf]
 ;B[rh]
 ;W[sf]))
 (;W[pf]LB[rb:a][qg:b]C[Black 'a' and 'b' are possible continuations.
 White leaves himself open to be cut later.]
 (;B[rb])
 (;B[qg])))
 (;B[qg]LB[rb:B][me:A][ne:C][re:D]C['a' or 'b' are ok.
 'c' is not recommended.
 'd' is questionable.]
 (;W[me]LB[jc:A][md:C][re:B]C[White needs the ladder.
 'a' is joseki, 'b' and 'c' are variations.
 'c' takes 20 points of territory for a wall.]
 (;B[jc]
 ;W[re]
 ;B[rd]
 ;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[se]
 ;W[pf]LB[oe:B][rf:A]C['a' if the ladder works for White. 'b' punishes if Black has the ladder.]
 (;B[rf]
 ;W[oe]
 ;B[qj])
 (;B[oe]
 ;W[of]
 ;B[ne]
 ;W[nd]
 ;B[nf]
 ;W[ng]
 ;B[mf]))
 (;B[re]LB[lc:A][kd:B]C['a' for territory, 'b' for influence.]
 (;W[lc]
 ;B[ld]
 ;W[md]
 ;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb]
 ;B[gc])
 (;W[kd]LB[kb:A][kc:B][ne:C]C['a' and 'b' lead to clear results, 'c' to a fight.]
 (;B[kb]
 ;W[of]
 ;B[ic]
 ;W[ph])
 (;B[kc]
 ;W[jc]
 ;B[ld]
 ;W[le]
 ;B[jb]
 ;W[jd]
 ;B[ib]
 ;W[md]
 ;B[lc]
 ;W[nc]
 ;B[fc]
 ;W[mb]
 ;B[lb]
 ;W[la]
 ;B[kb])
 (;B[ne]
 ;W[nd]
 ;B[md]
 ;W[le]
 ;B[oe]
 ;W[nb]
 ;B[mb]
 ;W[pe]LB[pf:B][og:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[og]
 ;W[pd]
 ;B[kb]
 ;W[pf]LB[of:A]C[White threatens a ladder on 'a'.]
 ;B[nh]
 ;W[mg]
 ;B[of]
 ;W[jb]
 ;B[nc]
 ;W[ob]
 ;B[jc]
 ;W[kc]
 ;B[ib]
 ;W[lb]
 ;B[ja]
 ;W[la]LB[fc:B][pg:A]C['a' is correct, other moves like 'b' are mistakes.]
 (;B[pg]
 ;W[ie])
 (;B[fc]
 ;W[pg]
 ;B[ph]
 ;W[qh]C[The Black stone on the right have become weak now.]))
 (;B[pf]
 ;W[pd]
 ;B[qe]
 ;W[nc]
 ;B[kb]
 ;W[of]
 ;B[nf]
 ;W[og]
 ;B[ng]
 ;W[pg]
 ;B[qf]
 ;W[nh]
 ;B[mg]
 ;W[jb]))))
 (;B[md]
 ;W[le]
 ;B[kd]
 ;W[re]
 ;B[rd]
 ;W[qe]LB[pd:A][pe:B]
 (;B[pd]
 ;W[pe]
 ;B[oc]
 ;W[oe]
 ;B[ob]
 ;W[qj])
 (;B[pe]
 ;W[pd]
 ;B[se]
 ;W[pf]
 ;B[rf]
 ;W[oe]
 ;B[qj])))
 (;W[rb]
 ;B[rd]
 ;W[ne]
 ;B[qj]
 ;W[ld]
 ;B[kc])
 (;W[ne]
 ;B[jc]
 ;W[qh]C[If Black has a stone in the lower right corner, he will always
 get a good result.]
 ;B[ph]
 ;W[qi]
 ;B[pf]
 ;W[rb]
 ;B[pi]
 ;W[qk]
 ;B[pj]
 ;W[pk]
 ;B[qj]
 ;W[rj]LB[ri:B][ok:C][rk:A]C['a', 'b' or 'c'.]
 (;B[rk]
 ;W[rl]
 ;B[ri]
 ;W[sk]
 ;B[rh])
 (;B[ri]
 ;W[rh]
 ;B[rk]
 ;W[si]
 ;B[rl]
 ;W[qm]
 ;B[rm]
 ;W[rg]
 ;B[rf]
 ;W[sg]
 ;B[qn]
 ;W[og]
 ;B[pg]
 ;W[ok])
 (;B[ok]))
 (;W[re]
 ;B[rd]LB[md:A][qe:B]C['a' or 'b'.]
 (;W[md]
 ;B[ld]
 ;W[me]
 ;B[nc]
 ;W[qe]
 ;B[pe]
 ;W[pd]LB[oe:A][se:B]C['a' is correct. 'b' is a mistake.]
 (;B[oe]
 ;W[rb]
 ;B[qf]
 ;W[sc]
 ;B[nd]
 ;W[ne]
 ;B[og])
 (;B[se]
 ;W[pf]
 ;B[rf]
 ;W[oe]LB[kd:B][qi:A]C[Black can one remove one weakness on either 'a' or 'b'.]
 (;B[qi]
 ;W[jd])
 (;B[kd]
 ;W[qi])))
 (;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[qf]
 ;W[md]LB[lc:B][ld:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[ld]LB[lc:A][me:B]C['a' or 'b'.]
 (;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[me]
 ;W[nd]
 ;B[kd]
 ;W[pf]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[nf]
 ;B[pg]
 ;W[mb])
 (;W[me]
 ;B[oe]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kd]
 ;W[mb]LB[lf:A]C[Later, 'a' is a good follow-up for Black.]))
 (;B[lc]LB[jd:A][oe:B]C['a' is correct, 'b' leads to overconcentration.]
 (;W[jd]
 ;B[ke]
 ;W[pf]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[kd]
 ;B[ld]
 ;W[le]
 ;B[lf]
 ;W[og]
 ;B[pg]
 ;W[nf]
 ;B[pf]
 ;W[me]
 ;B[nc]
 ;W[nd]
 ;B[jb]
 ;W[hd]
 ;B[kf]
 ;W[ib]
 ;B[kb])
 (;W[oe]
 ;B[pf]
 ;W[rb]
 ;B[rf]
 ;W[sc]
 ;B[se]
 ;W[nc]
 ;B[ld]
 ;W[me]))))))
 (;B[pd]
 ;W[pc]
 ;B[oc]LB[ob:b][pd:5][rd:a][oe:c]C[White 'a' is joseki.
 White 'b' and 'c' are not joseki. White 'b' is less good than a similar variation after 'a' and the reason why Black 5 is traditionally called trick play.
 White 'c' gives Black an option to fight (at Black's advantage)or settle (to Black's slight advantage) with Black in the corner and on the right, White taking the top.]
 (;W[rd]LB[oe:a][qe:b][re:c]C[Black 'a' and 'c' give settled groups. Most outcomes after 'c' are slightly better for White.
 Black 'b' starts a fight.]
 (;B[oe]
 ;W[nd]LB[ob:A][nc:B]C['a' or 'b'.]
 (;B[ob]
 ;W[qf]
 ;B[pe]
 ;W[rb]
 ;B[me]C[
 * Joseki *])
 (;B[nc]LB[ne:b][re:a]C[White 'a' is joseki. White 'b' starts a fight (rather needlessly).]
 (;W[re]LB[me:a][ne:b][qf:c]C[Black plays 'a' if the ladder is unfavorable, 'b' if the ladder works.
 'c' is not recommended.]
 (;B[me]
 ;W[pe]
 ;B[md])
 (;B[ne])
 (;B[qf]C[Black 13 is not recommended.]
 ;W[qg]LB[pe:A][rf:B]C[White 14 is a tesuji to get White out and up.
 Black continues with 'a'. Black cannot resist with 'b'.]
 (;B[pe]
 ;W[rf])
 (;B[rf]LB[pe:a][qe:b]C[Black 15 is unreasonable.
 White may play 'a' or 'b'.]
 (;W[pe]
 ;B[qe]
 ;W[pf])
 (;W[qe]
 ;B[pe]
 ;W[pf]))))
 (;W[ne]C[Black 12 needlessly starts a fight.]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[of]LB[pb:b][qh:a]C[Black 'a' give Black top and right, White corner and center, a complicated but equal result.
 Black 'b' takes the corner (20 points) while giving White superior thickness.]
 (;B[qh]
 ;W[ob]
 ;B[nb]
 ;W[pa]
 ;B[jc])
 (;B[pb]
 ;W[qb]
 ;B[ob]
 ;W[qg]LB[sd:a][rg:b]C[Black 'a' and 'b' lead to the same outcome.]
 (;B[sd]
 ;W[rf]
 ;B[sb]
 ;W[qf]
 ;B[sc]
 ;W[pe]
 ;B[se]C[Black's territory is 20 points, but White has superior thickness.])
 (;B[rg]
 ;W[rh]
 ;B[rf]
 ;W[qi]
 ;B[sb]
 ;W[qf]
 ;B[sd]
 ;W[pe]
 ;B[sc]C[Same outcome as 'a': Black has 20 corner points, White superior thickness.])))))
 (;B[qe]
 ;W[re]
 ;B[qf]
 ;W[ob]
 ;B[nc]
 ;W[oe]C[The White stone takes flight.])
 (;B[re]LB[nc:a][qe:b]C[White 'a' has various outcomes.
 White 'b' emphasizes the top, but gives Black great thickness on the right.]
 (;W[nc]
 ;B[ob]
 ;W[nb]LB[nd:a][oe:b]C[Black 'a' is correct, 'b' a mistake.]
 (;B[nd]
 ;W[oe]
 ;B[mb]LB[ne:b][qe:a]C[White 'a' takes the top favorably. White 'b' gives Black a choice of top or right, but White still has a favorable result.]
 (;W[qe]C[White is slightly better off.])
 (;W[ne]LB[na:b][rc:a]C[Black 'a' takes the corner, but gives White advantageous thickness.
 Black 'b' takes the top with White at an advantage again.]
 (;B[rc]
 ;W[qe]
 ;B[sd]
 ;W[pe]
 ;B[rd]
 ;W[na]
 ;B[qb]
 ;W[md]C[The result favors White.])
 (;B[na]
 ;W[qe]CR[qb]C[Black still has the endgame attachment at the red dot.])))
 (;B[oe]
 ;W[nd]
 ;B[rc]C[Black 3 is terribly weakened.]))
 (;W[qe]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[of]LB[rc:b][md:a]C[White 'a' takes the right while giving Black thickness. White 'b' takes the corner, but White gets sealed in (bad for White).]
 (;W[md]
 ;B[rc]
 ;W[pb])
 (;W[rc]
 ;B[nd]
 ;W[ne]
 ;B[md]
 ;W[pb]
 ;B[mf]C[Black fences White in, which is terrible for White.]))))
 (;W[ob]C[White 8 is getting tricked.]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]LB[ob:8][pd:5][rd:10][oe:a][re:11][pf:b]TR[qe]C[This result is better for Black, because in the equal fighting outcome after White 8 on 10, there is a White stone on 11 and a Black stone on the triangled position, so White is not so much enclosed, and Black has not so good shape. This difference is the reason for Black 5 being considered a trick play.
 If White 'a', Black 'b'. Moving out White 2 only creates a burden for White.])
 (;W[oe]LB[ob:a][rc:b]C[Black 'a' starts a fight at which Black has an advantage.
 Black 'b' yields a settled result slightly to Black's favor;
 Black has the corner and right, White the top.]
 (;B[ob]
 ;W[rd]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;W[rb]
 ;B[pg]
 ;W[me]
 ;B[kd]C[White faces a disadvantageous fight.])
 (;B[rc]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[qb]
 ;W[md]
 ;B[pf]C[The result is rougly equal.])))
 (;B[jc]LB[pd:a][rd:b]C[Black 5 is not joseki.
 White continues with 'a'. Black 'b' is a mistake.]
 (;W[pd]
 ;B[qe]LB[pb:a][rc:b]C[White 'a' makes good shape. White 'b' is a mistake.]
 (;W[pb])
 (;W[rc]C[White 8 is a mistake, as Black profitably forces White in solid shape.]
 ;B[ob]
 ;W[pb]
 ;B[oc]
 ;W[pc]
 ;B[pg]))
 (;W[rd]C[White 6 is wrong in this situation.]
 ;B[pc]
 ;W[pd]
 ;B[qe]LB[oc:a][rc:b]C[White has two weaknesses: 'a' and 'b'.]))
 (;B[rd]LB[md:A]C[Rare joseki, invented in Japan.
 Attachment at 'a' is probably best for White here.
 White may tenuki.])
 (;B[re]C[Rare joseki.]
 ;W[pd]
 ;B[qg]
 ;W[rd]
 ;B[qe]
 ;W[pb]
 ;B[jc]C[The result is about equal.])
 (;B[qg]C[Modern joseki, invented in Japan.]
 (;W[pd]
 (;B[rd]
 (;W[ob]
 ;B[jc]
 ;W[rc]
 ;B[qj]C[Joseki])
 (;W[nc]
 (;B[md]
 ;W[rc]
 ;B[nf]C[Joseki])
 (;B[ld]C[Possible too.]))
 (;W[pf]
 ;B[qh]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[md]
 ;W[me]
 ;B[kc]
 ;W[jd]
 ;B[ic]
 ;W[lf]C[Joseki]))
 (;B[re]C[Rare joseki. Outdated.]))
 (;W[rd]C[Usually bad for White.]
 ;B[pc]
 ;W[qe]
 ;B[pd]
 ;W[pe]
 ;B[rc]
 ;W[pb]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[qb]
 ;W[nd]
 ;B[of]
 ;W[oe]
 ;B[nf]C[White is heavy.])))
 (;W[ob]LB[pf:A][qg:B]C['a' is usual. 'b' is possible.]
 (;B[pf]
 ;W[ne]LB[kd:b][qj:a]C[Black continues with 'a' or 'b'.]
 (;B[qj]
 ;W[kc]C[
 * Joseki *])
 (;B[kd]LB[jc:A]C[Oftenly, the move is better on 'a'.]
 ;W[qh]LB[og:B][ph:A]C[Black continues with 'a' or 'b'.]
 (;B[ph]
 ;W[pi]
 ;B[oh]
 ;W[qe]LB[pe:B][re:A]C['a' is the new joseki which grips the right side for some points in the corner.
 'b' is the old variation, after which the White stones on the right may still be used.]
 (;B[re]
 ;W[pd]
 ;B[qi]
 ;W[rd]
 ;B[rf]
 ;W[qc]
 ;B[qj]LB[jc:A][kd:7]C[
 * Joseki *
 Black 7 is also good on 'a'.])
 (;B[pe]
 ;W[pd]
 ;B[re]
 ;W[qc]
 ;B[qf]
 ;W[rc]LB[id:b][pk:a]C[Black continues with 'a', White with 'b'. With support in the lower right, White can also strengthen his stones on the right.]))
 (;B[og]LB[qe:a][pj:b]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[re]
 ;W[qc]
 ;B[qf]
 ;W[rc]
 ;B[pi])
 (;W[pj]
 ;B[pc]
 ;W[oc]
 ;B[qb]
 ;W[mf]))))
 (;B[qg]C[If you know the follow-up, please email: kogo@waterfire.us.]))
 (;W[md]LB[nc:b][ld:a][nd:c]C[Black 'a' is usual; 'b' and 'c' are also possible. Black must have the ladder to play 'c'.]
 (;B[ld]LB[lc:B][me:A]C['a' is correct, 'b' is a silly mistake.]
 (;W[me]
 ;B[nc]
 ;W[oc]LB[mc:3][nc:7][oc:2][ld:5][md:4][od:8][qd:1][me:6]C[
 * Joseki *
 This is the same position as the variation referred to by the numbers. Look there for the continuations.])
 (;W[lc]LB[nc:B][nd:A]C['a' is a simple punishment, 'b' aims to start an advantageous fight but that doesn't work.]
 (;B[nd]LB[nc:B][me:A]C['a' or 'b' don't help.]
 (;W[me]LB[oc:A][ne:B]C['a' takes much territory while Whuite's wall becomes too small or crippled.
 'b' is also possible.]
 (;B[oc]
 ;W[ne]
 ;B[nc]LB[kc:A][pd:B]C['a' or 'b' don't help.]
 (;W[kc]
 ;B[pf]C[Unbalanced situation: Black's territory is more than White's potential and influence.]
 ;W[pd]C[This continuation doesn't work.]
 ;B[pc]LB[qc:B][qe:A]C['a' or 'b' don't help.]
 (;W[qe]LB[pe:B][re:A]C['a' is correct. 'b' is a mistake.]
 (;B[re]
 ;W[rd]
 ;B[qc]LB[pe:A][rf:B]C['a' or 'b' give a bad result for White.]
 (;W[pe]
 ;B[qf]
 ;W[oe]
 ;B[rf])
 (;W[rf]
 ;B[qf]
 ;W[se]
 ;B[oe]))
 (;B[pe]
 ;W[oe]
 ;B[rd]LB[qe:16]C[White 16 leaves much aji for White.]))
 (;W[qc]
 ;B[qe]
 ;W[oe]
 ;B[qb]))
 (;W[pd]
 ;B[pc]LB[kc:C][qe:A][pf:B]C['a', 'b' or 'c' don't help.]
 (;W[qe]
 ;B[qc]LB[kc:A][pf:B]C['a' or 'b' don't help.]
 (;W[kc]
 ;B[qf]
 ;W[pe]
 ;B[re]
 ;W[pf]
 ;B[qg])
 (;W[pf]
 ;B[kc]))
 (;W[pf]
 ;B[kc])
 (;W[kc]
 ;B[pf]
 ;W[qe]
 ;B[re]C[Reversed order of moves.])))
 (;B[ne]
 ;W[nc]
 ;B[mb]
 ;W[oc]
 ;B[kc]
 ;W[le]
 ;B[kd]
 ;W[nf]
 ;B[qf]
 ;W[pe]
 ;B[qg]
 ;W[nb]
 ;B[lb]))
 (;W[nc]
 ;B[me]
 ;W[mb]
 ;B[oc]
 ;W[md]
 ;B[ne]
 ;W[pc]
 ;B[ob]
 ;W[pd]
 ;B[pb]
 ;W[qc]
 ;B[mc]
 ;W[dp]C[No ko threat in fuseki.]
 ;B[nb]
 ;W[qh]
 ;B[qb]
 ;W[rc]
 ;B[hc]))
 (;B[nc]C[Don't peep where you can cut.]
 ;W[nd]
 ;B[oc]
 ;W[pc]
 ;B[pd]LB[pb:A][qc:B]C['a' is correct and crates a huge wall for some territory.
 'b' is a mistake leading to a disadvantageous fight.]
 (;W[pb]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[le]
 ;W[ob]
 ;B[na]
 ;W[of]
 ;B[rb]
 ;W[pe]
 ;B[qe]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[re]LB[ib:A][qg:B]C['a' or 'b'.]
 (;W[ib]LB[nb:A][qg:B]C['a' is necessary, 'b' is a mistake.]
 (;B[nb]
 ;W[qg])
 (;B[qg]
 ;W[nb]
 ;B[mb]
 ;W[ja]
 ;B[pf]
 ;W[oe]
 ;B[og]
 ;W[mf]))
 (;W[qg]))
 (;W[qc]
 ;B[lb]
 ;W[kc]
 ;B[pb]
 ;W[qb]
 ;B[pa]
 ;W[kb]
 ;B[la]
 ;W[qa]
 ;B[na]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]
 ;W[sb]
 ;B[le]
 ;W[nf]
 ;B[lg]
 ;W[nh]
 ;B[qi]))))
 (;B[nc]LB[oc:a][nd:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc]
 ;B[nd]LB[ne:b][pe:a]C[White 'a' is joseki. White 'b' is unreasonable.]
 (;W[pe]LB[ne:c][qe:b][nf:a][rf:d]C[Black 'a' is joseki. Black 'b' is not; the outcomes are favorable to White.
 Black 'c' is a slow version of 'a'.
 Black 'd' is not recommended.]
 (;B[nf]
 ;W[qe]C[
 * Joseki *])
 (;B[qe]C[Black 9 is not recommended.]
 ;W[ne]LB[lc:a][ld:c][me:d][pf:e][qf:b]C[Black may try 'a' to 'e'. 'a' and 'b' are miai for White.]
 (;B[lc]
 ;W[qf])
 (;B[qf]
 ;W[lc])
 (;B[ld]
 ;W[me]LB[lc:a][qf:b]C['a' and 'b' are miai for White.]
 ;B[kc]LB[lc:a]C[Black may also connect solidly at 'a'.]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh])
 (;B[me]
 ;W[ld]C[The continuation depends on the ladder and strategic considerations.])
 (;B[pf]
 ;W[lc]))
 (;B[ne]C[Black 9 is solid and a bit slow.]
 ;W[qe])
 (;B[rf]C[Black 9 is not recommended.]
 ;W[ne]
 ;B[ld]
 ;W[me]
 ;B[jc]
 ;W[qg]C[White 14 makes an ideal squeeze move. Black lives only by helping White build thickness.]))
 (;W[ne]C[White 8 is an overplay.]
 ;B[oe]
 ;W[pe]
 ;B[of]
 ;W[pd]
 ;B[me]
 ;W[nf]
 ;B[og]))
 (;W[nd]C[White 6 gives away a lot of territory for thickness that is less than wonderful.]
 ;B[oc]
 ;W[pd]
 ;B[pc]
 ;W[qe]
 ;B[ld]))
 (;B[nd]LB[nc:A][ne:B]C[Black must have the ladder to play this way.
 'a' is correct. 'b' is a mistake.]
 (;W[nc]
 ;B[ne]LB[lc:b][oc:a]C[White continues with 'a' or 'b'. 'a' gives White the corner,
 'b' gives White influence to the top.]
 (;W[oc]
 ;B[lc]
 ;W[pe]
 ;B[le]
 ;W[qe])
 (;W[lc]LB[mb:b][oc:a]C[Joseki continues with Black 'a'. Black 'b' has been used professionally.]
 (;B[oc]
 ;W[mb]
 ;B[nb]
 ;W[mc]
 ;B[ob]
 ;W[mf]
 ;B[oe])
 (;B[mb]C[Black 9 was played by Takagawa Shukaku against Kitani Minoru in the 1st Saikyo Title in March 1958.]
 ;W[oc]
 ;B[ld]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[kd]
 ;W[lf]
 ;B[kc]
 ;W[pe]
 ;B[nf]
 ;W[lg]
 ;B[nh]
 ;W[qe]
 ;B[mi]
 ;W[if]
 ;B[hd]
 ;W[ki]
 ;B[qg]
 ;W[nb]
 ;B[lb]
 ;W[re])))
 (;W[ne]
 ;B[nc]
 ;W[oc]
 ;B[oe]
 ;W[pe]
 ;B[of]
 ;W[pd]
 ;B[kc]
 ;W[me]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[re])))
 (;W[ne]LB[oc:d][pc:f][kd:c][me:b][pf:e][qg:a]C[Black continues with 'a' to 'c' or 'e'. Black 'd', attempting to connect underneath, does not work.
 With Black 'a and 'b', outcomes vary depending on White's play.
 Black 'b' is good to make a moyo with support in the upper left.
 With Black 'c', Black takes the top, White the right.
 With Black 'd', Black takes the corner, giving up on Black 3,
 the pincer.
 'f' is not recommended.]
 (;B[qg]LB[qc:a][ld:b]C[White continues with 'a' or 'b'.]
 (;W[qc]LB[pc:a][rc:b][ne:4]C[Once, 'a' was joseki and 'b' disadvantageous. But nowadays, 'b'has a follow-up which proves White 4 to be disadvantageous.]
 (;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[qe]
 ;B[rd]
 ;W[qf]LB[qb:A][rc:B]C['a' is correct, 'b' is disadvantageous because of a ko possibility.
+]
 (;B[qb]
 ;W[re]
 ;B[rc]
 ;W[pg])
 (;B[rc]
 ;W[pg]
 ;B[dp]C[Suppose Black plays elsewhere.]
 ;W[nc]C[Later, White can aim for ko.]
 ;B[nb]
 ;W[md]LB[pb:b][lc:a]C[Black 'a' and 'b' result in ko, neither favorable to Black.]
 (;B[lc]C[If Black 19, White gets a ko in the corner.]
 ;W[qb]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[rb]
 ;B[sb]
 ;W[ra]LB[oa:a][mb:c][re:b]C[If Black 'a', White 'b' makes ko. Cutting at 'c' is no good for White as this becomes a double ko.])
 (;B[pb]
 ;W[lc]
 ;B[mb]C[This is a great success for White.])))
 (;B[rc]
 ;W[pc]LB[jc:A][re:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[jc]LB[rb:B][re:A]
 (;W[re]
 ;B[rd]
 ;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[se]
 ;W[pf]
 ;B[rf]
 ;W[oe]LB[ne:4]C[Now White has bad shape. White 4 is too narrow. That's why White 4 is considered inferior.])
 (;W[rb]
 ;B[qj]))
 (;B[re]
 ;W[ld]LB[rc:7][qd:1][re:9][qg:5]C[When Black 5 was considered to be disadvantageous it was because it too low in combination with the eye-shape of Black 1-7-9.
 But it is not Black 5, but Black 9, which is the wrong move.])))
 (;W[ld]LB[oc:a][pc:b]C[Joseki continues with Black 'a'. Black 'b' is also possible, depending on the global situation.]
 (;B[oc]LB[lc:A][nc:C][pc:B]C[White continues with 'a'.
 'b' and 'c' are bad.]
 (;W[lc]
 ;B[pd]C[The Black territory is not equaled by the influence that White could get.])
 (;W[pc]
 ;B[pd]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[pb]TR[ld]C[The triangle stone is now bad positioned.])
 (;W[nc]C[White 8 is unreasonable.]
 ;B[nb]
 ;W[pc]
 ;B[nd]
 ;W[pd]
 ;B[oe]))
 (;B[pc]LB[lc:b][oc:a]C[Takagawa introduced this play in the 1956 Honinbo title match.
 In that match, White continued at 'a'. White 'b' is also possible.]
 (;W[oc]
 ;B[ic])
 (;W[lc]
 ;B[nb]LB[md:a][me:b]C[Black connects with 9, and threatens Black 'a' and 'b'. White
 has no good answer to Black 9.]))))
 (;B[me]C[Black plays 5 to prevent White from pressing down on his pincer.]
 ;W[mf]LB[md:B][le:A]C['a' is the modern basic joseki, 'b' the old variation.]
 (;B[le]LB[nc:A][nf:C][qf:B]C['a' results in a fight. 'b' takes the corner for the top side. 'c' is good for Black.]
 (;W[nc]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[og]
 ;B[nh]
 ;W[oh]
 ;B[ni]
 ;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[nb]
 ;W[la]
 ;B[oc]
 ;W[nd]
 ;B[pd]
 ;W[oe]
 ;B[ob]
 ;W[pj]
 ;B[qg])
 (;W[qf]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[og]
 ;B[nh]LB[nc:B][pc:A]C['a' kills the corner, 'b' doesn't and is a little stronger on the outside.]
 (;W[pc]
 ;B[oh]
 ;W[qh])
 (;W[nc]
 ;B[mb]
 ;W[pi]C[
 If you know the follow-up in the corner, please email kogo@waterfire.us.]))
 (;W[nf]
 ;B[qg]
 ;W[kg]
 ;B[je]))
 (;B[md]LB[pc:b][lf:a]C[White continues with 'a' to take the right or 'b' to take the
 corner and center.]
 (;W[lf]
 ;B[oc]LB[pc:b][pd:a]C[The position is usually left like this for the time being. White's continuations in the corner are 'a' and 'b'.]
 ;W[pd]
 ;B[pc]
 ;W[qe]
 ;B[rd]
 ;W[qg]C[White may continue here.])
 (;W[pc]LB[qc:b][lf:a]C[White 8 forestalls the connection Black was hoping for. Black
 continues with 'a'. Black 'b' is submissive.]
 (;B[lf]
 ;W[ng]
 ;B[qg]
 ;W[lg]
 ;B[kf]
 ;W[qc]
 ;B[qj])
 (;B[qc]C[Black 9 is submissive]
 ;W[lf]))))
 (;B[kd]LB[qc:b][qf:a]C[Black 5 is a trick play. White continues with 'a'. White must not attach at 'b'.]
 (;W[qf]
 ;B[pe]
 ;W[pf]
 ;B[oe]
 ;W[of]
 ;B[nd]
 ;W[rc]LB[oc:b][rd:c][me:a]C[White 12 is a tesuji to steal the corner.
 Black continues with 'a', possibly 'b'.
 Black 'c' is a mistake. Black cannot prevent White from crossing under.]
 (;B[me]
 ;W[nf]
 ;B[oc]
 ;W[rd])
 (;B[oc]
 ;W[rd])
 (;B[rd]C[Black 13 is unreasonable.]
 ;W[pd]C[White 14 kills the Black stones.]))
 (;W[qc]C[White has been tricked.]
 ;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[qe]
 ;B[rd]LB[nc:a][re:b]C[White continues with 'a' or 'b'.]
 (;W[nc]
 ;B[nb]
 ;W[nd]
 ;B[pb]
 ;W[re]
 ;B[rc]
 ;W[qi]LB[nb:9][mc:3][nc:8][oc:7][pc:5][qc:4][od:2][pd:6][qd:1]C[White's moves appear reasonable, but compare the result to the outcome of the variation referenced by the numbers.])
 (;W[re]
 ;B[rc])))
 (;B[oc]LB[nc:b][pc:a][pd:c]C[Black 5 attempts to connect underneath, to no avail.
 White continues with the sacrifice of 'a'.
 White 'b' is premature (the sacrifice of 'a' is prerequisite).
 White 'c' is passive.]
 (;W[pc]C[White 6 is a sacrifice to separate Black 3 from 5.]
 ;B[pd]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[qg])
 (;W[nc]C[White 6 is out of sequence.]
 ;B[pc]
 ;W[nb]
 ;B[md]
 ;W[nd]
 ;B[qg])
 (;W[pd]C[White 6 gives Black the corner and lets Black stay connected.]
 ;B[pc]
 ;W[qe]
 ;B[rd]))
 (;B[pf]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]LB[pc:8][qc:6][rc:7][ne:4][re:9][pf:5]C[Now, this is the same position like White 6, Black 7, White 8 and Black 9 being played before White 4 and Black 5, look there for continuations.])
 (;B[pc]
 ;W[ld]
 ;B[nb]
 ;W[kf]))
 (;W[]LB[oc:a][me:c][pf:b]C[White plays elsewhere.
 Black continues with 'a' to 'c'.]
 (;B[oc]
 ;W[nd]
 ;B[nc]
 ;W[pd]
 ;B[pc]
 ;W[qe]
 ;B[rd])
 (;B[pf]
 ;W[ne]
 ;B[pc]
 ;W[oc])
 (;B[me]))
 (;W[pf]TR[jj][pp]C[This move is correct, if:
 a) there's an additional Black stone on the squared position, or
 b) there are additional White stones on the triangled positions.]MA[jc]
 ;B[oc]LB[nd:B][pd:A]C['a' or 'b' are ok.]
 (;W[pd]
 ;B[pc]
 ;W[qe]
 ;B[rd]
 ;W[nd])
 (;W[nd]
 ;B[pc]
 ;W[qe]
 ;B[pd]
 ;W[nf]))
 (;W[pd]C[Old japanese joseki]
 (;B[qc]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[ob])
 (;B[qe]C[Most common answer for Black]
 ;W[qc]
 ;B[rc]
 ;W[pb]
 ;B[qb]LB[rb:A]C[Can also extend at A, but atari is better]
 ;W[pc]
 ;B[rb]
 ;W[pf]
 (;B[rg]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[md]
 ;W[me]
 ;B[kc]
 ;W[jd]
 ;B[ic]
 ;W[lf]C[Joseki])
 (;B[jc]
 (;W[rf]C[Tesuji]
 ;B[qf]
 ;W[qg]
 ;B[rg]
 ;W[pe]
 ;B[re]
 ;W[rh]
 ;B[sf]
 ;W[qh]C[Result is equal])
 (;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[re]C[Crude for White to block directly. White has weak shape]))
 (;B[pe]
 ;W[oe]
 ;B[of]
 ;W[ld]
 ;B[nf]
 ;W[md]
 ;B[pg]
 ;W[jc]C[Joseki])))
 (;W[qe]LB[pd:a][pe:c][re:b]C[White 4 with this pincer gives White an inferior result: each players gets a side, but Black gets the whole corner territory.
 Black continues with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[pd]C[Sometimes the simple move is the best.]
 ;W[pe]
 ;B[oc]
 ;W[oe]
 ;B[nd]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[lf]
 ;W[le]
 ;B[md]
 ;W[mg]
 ;B[kf]
 ;W[pk])
 (;B[re]C[Black 5 is passive.]
 ;W[pe]
 ;B[rf]
 ;W[qc]
 ;B[rd]
 ;W[oc])
 (;B[pe]C[Black 5 starts a complex battle that Black has no way to win.]
 ;W[pd]
 ;B[qf]
 ;W[re]
 ;B[qc]
 ;W[rf]
 ;B[oe]
 ;W[nd]))
 (;W[ph]C[Rare Japanese move]
 ;B[oc]
 ;W[nd]
 ;B[pc]
 ;W[pk]C[Locally Black is better, but it can be used if White wants to avoid fight.]))
 (;B[lc]LB[mc:H][qc:D][ld:G][md:F][qe:E][of:A][pf:C][pg:B][dp:I]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 If you know the follow-up, please email: kogo@waterfire.us.
 White continues with 'a', 'b', 'c' or 'd'.
 White needs the ladder for 'b'.
 'e', 'F', 'G' and 'H' are mistakes.
 If White plays tenuki 'I', Black has no good follow-up.
+]
 (;W[of]
 ;B[qf]LB[qc:B][oh:A]C[To keep the pseudo-pincer weak, White must make Black react against
 'a' on the right, not settling Black without settling himself
 by playing 'b'.]
 (;W[oh]
 ;B[qh]
 ;W[ic]LB[lc:3][ld:A][md:B]C[In contrast to Black 3 being on 'a' or 'b', Black 3 is one line slower on his escape route.
 So Black 3 is not ideally positioned.])
 (;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]
 ;W[jc]
 ;B[le]))
 (;W[pg]LB[pd:B][oe:A]C['a' good for W
 'b' good for W, W needs ladder]
 (;B[oe]
 ;W[ne]LB[pd:B][of:A]C['a', 'b' good for W]
 (;B[of]
 ;W[pd]
 ;B[qf]
 ;W[nf]
 ;B[og]
 ;W[qc]
 ;B[qe]
 ;W[rc]LB[lc:3][ld:A]C[In contrast to Black 3 being on A, White doesn't need the ladder for this move, so Black 3 is bad positioned.]
 ;B[nd]C[The cut doesn't work now.]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]
 ;B[me]C[All Black attempts to rescue his stones fail.]
 ;W[mg]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[kc]
 ;B[mh]
 ;W[lg]
 ;B[ng]
 ;W[mf]
 ;B[kh]
 ;W[lh]
 ;B[li]
 ;W[mi]
 ;B[nh]
 ;W[ki]
 ;B[lj]
 ;W[kg]
 ;B[jh]
 ;W[jg]
 ;B[ig]
 ;W[ih]
 ;B[ji]
 ;W[if]
 ;B[hg]
 ;W[je])
 (;B[pd]
 ;W[of]
 ;B[oc]
 ;W[pe]
 ;B[nc]LB[lc:3]C[Black 3 is now too near.]))
 (;B[pd]
 ;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[nd]LB[pc:B][md:A]C['a' good for W, ladder
 'b' mistake, good for B]
 (;W[md]LB[lc:3][ld:A]C[If Black 3 was on A, it would be a ladder breaker, so it is badly positioned, and Black ends up low.]
 ;B[nb]
 ;W[ne]
 ;B[ob])
 (;W[pc]
 ;B[ob]
 ;W[pb]
 ;B[nb]
 ;W[rc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pa]
 ;W[sa]
 ;B[rb]
 ;W[sb]
 ;B[oa]
 ;W[rd]
 ;B[qa]
 ;W[qe]
 ;B[rb]
 ;W[qb])))
 (;W[pf]LB[oc:A][oe:B]C['a' is correct. 'b' good for White.]
 (;B[oc]
 ;W[nc]
 ;B[pc]
 ;W[nd]
 ;B[rf])
 (;B[oe]
 ;W[pe]
 ;B[pd]
 ;W[nd]
 ;B[og]
 ;W[me]
 ;B[of]
 ;W[re]
 ;B[ob]
 ;W[rd]
 ;B[rc]
 ;W[qh]
 ;B[mc]LB[lc:3]C[Black 3 is now too narrow.]))
 (;W[qc]LB[pc:B][rc:A]C['a' correct
 'b' mistake]
 (;B[rc]LB[rb:B][pc:A]C['a', 'b' good for B]
 (;W[pc]
 ;B[re]LB[of:A][pf:B]C['a' is ok, 'b' is also possible.]
 (;W[of]
 ;B[qg]
 ;W[jc]
 ;B[le]
 ;W[je]
 ;B[lg]
 ;W[oh]C[White has two unsettled groups, Black only one.])
 (;W[pf]
 ;B[qg]
 ;W[pg]
 ;B[qh]
 ;W[jc]))
 (;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pb]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[pd]
 ;W[of]
 ;B[le]))
 (;B[pc]
 ;W[pd]
 ;B[oc]
 ;W[nc]LB[nb:B][nd:A]C['a', 'b' good for White.]
 (;B[nd]
 ;W[ne]
 ;B[md]
 ;W[ob])
 (;B[nb]LB[mb:C][qb:A][nd:B]C['a' is good for White.
 'b' and 'c' are mistakes, good for Black.]
 (;W[qb]
 ;B[nd]
 ;W[qe]LB[mc:A][ne:B]C['a', 'b' good for White.]
 (;B[mc]
 ;W[of])
 (;B[ne]
 ;W[mc]
 ;B[mb]
 ;W[ob]
 ;B[md]
 ;W[nc]))
 (;W[nd]
 ;B[qb]LB[mb:B][rc:A]C['a', 'b' good for Black.]
 (;W[rc]
 ;B[rd]
 ;W[rb]
 ;B[pb])
 (;W[mb]
 ;B[ob]
 ;W[rc]
 ;B[rd]
 ;W[rb]
 ;B[ra]))
 (;W[mb]
 ;B[mc]
 ;W[nd]
 ;B[ob]))))
 (;W[qe]
 ;B[re]
 ;W[pe]
 ;B[rf]
 ;W[qc]LB[rc:A][rd:B]C['a', 'b' good for Black.]
 (;B[rc]
 ;W[pd]
 ;B[rd]
 ;W[qb]
 ;B[qh])
 (;B[rd]
 ;W[pc]
 ;B[pg]
 ;W[rc]
 ;B[ic]))
 (;W[md]
 ;B[nb]
 ;W[ld]
 ;B[kc]LB[pc:B][qe:A]C['a', 'b' good for Black.]
 (;W[qe]LB[pc:A][pd:B]C['a', 'b' good for Black.]
 (;B[pc]
 ;W[pe]
 ;B[pj])
 (;B[pd]
 ;W[pe]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[oe]
 ;B[pj]))
 (;W[pc]
 ;B[qg]))
 (;W[ld]
 ;B[mc])
 (;W[mc]
 ;B[ld]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[qg])
 (;W[]
 ;B[pf]C[White tenukis agains.
+]
 ;W[]
 ;B[ne]C[White is still not completely dead.
+]
 ;W[md]
 ;B[nd]
 ;W[mc]C[White can enlargen an already existing territory on the top side.
 ]))
 (;B[kc]LB[qc:C][qe:B][of:A][pf:D]C[
 -Space Low Pincer = Sangen Basami = Sekan Hyeopgong = San Jia
 ---------------------------------------------------------------
 'a', 'b' or 'c'. 'd' is disadvantageous.
+]
 (;W[of]LB[qf:A][dp:B]C['a' or tenuki 'b'.]
 (;B[qf]
 ;W[oh]
 ;B[qh]
 ;W[qc]
 ;B[rc]
 ;W[ic]
 ;B[ke]
 ;W[kg])
 (;B[dp]
 ;W[qf]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[qg]
 ;B[pc]
 ;W[oc]))
 (;W[qe]
 ;B[re]
 ;W[pe]
 ;B[rf]
 ;W[qc]
 ;B[rd]
 ;W[pc]
 ;B[qi]
 ;W[mc])
 (;W[qc]
 ;B[dp]
 ;W[pd]
 ;B[qe]
 ;W[pb]
 ;B[qh])
 (;W[pf]
 ;B[oe]
 ;W[pe]
 ;B[pd]LB[oc:B][ne:A]C['a' or 'b'.]
 (;W[ne]
 ;B[oc]
 ;W[of]
 ;B[nc])
 (;W[oc]
 ;B[ne]
 ;W[qb]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rc]
 ;W[md]
 ;B[ng])))
 (;B[md]LB[qc:b][qe:d][of:a][pf:e][pg:c]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 ----------------------------------------------------------------------------
 White responds with 'a', 'b' or 'c'. White 'd' is wrong. White 'e' is a mistake.
 outcomes
 White 'a' = White top, Black right
 White 'b' = White corner, Black right
 White 'c' = White top and aji on the right, Black between corner and center.
 White 'e' = White thickness, Black corner + favorable result
+]
 (;W[of]LB[oc:b][qf:a]C[Black continues with 'a'. Black 'b', attempting to connect underneath, is vulgar.]
 (;B[qf]
 ;W[qc]LB[pc:B][rc:A]C['a' is joseki, 'b' is a mistake.]
 (;B[rc]LB[pc:B][jd:A]C['a' is correct, 'b' is possible to settle White immediatley.]
 (;W[jd]LB[rb:B][pc:A]C[
 * Joseki *
 Later, White plays 'a' or, if the fight in the middle has become less important than making points in the corner, 'b'.
 Black 'a' is gote.]
 (;W[pc])
 (;W[rb]LB[pc:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[pc])
 (;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc]))
 (;B[pc]
 ;W[oc]LB[qb:A][dp:B]C['a' is necesary, tenuki 'b' is not recommended.]
 (;B[qb])
 (;B[dp]
 ;W[qb]
 ;B[pd]
 ;W[pb])))
 (;W[pc]LB[rb:A][re:B]C['a' or 'b' are ok.]
 (;B[rb]LB[mc:A][jd:B]C['a' if the White group needs immediate life, 'b' to attack the pincer.]
 (;W[mc]
 ;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[me]
 ;B[kd]
 ;W[nd])
 (;W[jd]))
 (;B[re]LB[mc:A][kd:B]C['a' is simple. 'b' is complicated.]
 (;W[mc]
 (;B[lc]
 ;W[ld]LB[mb:A][kc:B]C['a' or 'b' are ok.]
 (;B[mb]
 ;W[nc]
 ;B[kc]LB[le:A][me:B]C['a' or 'b'.]
 (;W[le]
 ;B[kd]
 ;W[lf])
 (;W[me]
 ;B[kd]
 ;W[nd]
 ;B[gc]))
 (;B[kc]
 (;W[me]
 ;B[kd]
 ;W[nd]
 ;B[gc])
 (;W[le]
 ;B[mb]
 ;W[nc]
 ;B[id]))
 (;B[kd]C[Rare]
 ;W[le]
 ;B[kc]
 ;W[mb]
 ;B[kf]))
 (;B[ld]C[New Korean joseki]
 ;W[lc]
 ;B[kc]
 ;W[kd]
 ;B[nc]
 (;W[nb]
 ;B[kb]
 ;W[mb]
 ;B[jd]
 ;W[ke]
 ;B[je]
 ;W[kf]
 ;B[jf]
 ;W[kg]C[Joseki])
 (;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[nd]
 ;B[ke]
 ;W[ib]C[Modern joseki])))
 (;W[kd]
 ;B[le]C[White has two unsettled groups, Black only one.]))))
 (;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]LB[rd:A][pe:B]
 (;B[rd]
 ;W[pb]
 ;B[oc]
 ;W[rb]
 ;B[nc]
 ;W[qg])
 (;B[pe]
 ;W[oe]
 ;B[rb]
 ;W[oc]
 ;B[pb]
 ;W[qg]
 ;B[rd]
 ;W[rf])))
 (;B[oc]LB[nc:a][pc:b]C[Black 5 is a mistake.
 White continues with 'a'. White 'b' is not recommended.]
 (;W[nc]
 ;B[nd]
 ;W[pc]LB[ob:b][pd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pd]LB[ob:a][oe:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ob]
 ;B[oe]
 ;W[oc]
 ;B[pe]
 ;W[ne])
 (;W[oe]C[White 10 is not recommended.]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[mg]))
 (;B[ob]C[Black 9 is unreasonable.]
 ;W[pd]
 ;B[nb]
 ;W[qe]C[White has superior position.]))
 (;W[pc]C[White 6 is not recommended.]
 ;B[pd]
 ;W[nc]LB[ob:A][oe:B]C['a' or 'b'.]
 (;B[ob]
 ;W[nd]
 ;B[pb]C[White's outside shape is okay, but Black has a better position, and profit in the large corner.])
 (;B[oe]
 ;W[ob]
 ;B[nd]
 ;W[oc]
 ;B[ne]
 ;W[qf]
 ;B[pe]
 ;W[lc])))
 (;B[qg]C[Rare]))
 (;W[qc]LB[pc:B][pd:A]C['a' or 'b'.]
 (;B[pd]
 ;W[pc]
 ;B[oe]
 ;W[oc]
 ;B[pf]LB[mb:a][ne:b]C[White continues with 'a', possibly 'b'.]
 (;W[mb]
 ;B[ne]C[
 * Joseki *])
 (;W[ne]C[White 10 creates a center group, as Black cuts 10 off from the
 White corner group. White must want that result for White 10
 to be considered a reasonable play.]
 ;B[nd]
 ;W[nf]LB[oc:2][pc:8][qc:6][md:3][nd:9][od:10][pd:7][qd:1][ne:4][oe:11][nf:12][pf:5]C[This is the same position as in the variation referred by the numbers; see there for the continuations.]))
 (;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[rc]LB[rd:B][qe:A]C['a' is better than 'b'.]
 (;B[qe]LB[pb:B][oc:A]C['a' runs or fights outside, 'b' lives enclosed in the corner.]
 (;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[rb]
 ;W[of])
 (;W[pb]
 ;B[oc]LB[ob:A][rb:B]C['a' is ok, 'b' is wrong.]
 (;W[ob]
 ;B[nc]
 ;W[rb]
 ;B[nf])
 (;W[rb]
 ;B[ob]
 ;W[qa]
 ;B[ne])))
 (;B[rd]
 ;W[pb]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[nd])))
 (;W[pg]LB[pd:A][oe:B]C['a' is correct, 'b' disadvantageous.
+]
 (;B[pd]LB[oc:B][oe:A]C['a' is correct, 'b' wrong.
+]
 (;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[nd]
 ;W[nb]
 ;B[pc]
 ;W[lc]
 ;B[of]LB[ic:A]C[White plays tenuki or 'a',
+]
 ;W[ic]
 ;B[ne]C[Later, White can develop a position on the right side.
 ])
 (;W[oc]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[nd]C[White 10 is necessary, but makes White heavy.]))
 (;B[oe]C[The sacrifice play of Black 5 is not as good as the alternative of Black 5 onto the marked point.]MA[pd]
 ;W[ne]
 ;B[nd]
 ;W[pe]
 ;B[pd]
 ;W[of]
 ;B[oc]LB[md:3]TR[ld]C[Black gets a big corner, but White has decent outside shape.
 Black has less territory than the similar joseki after Black 3 on the triangled position.
 ]))
 (;W[qe]LB[pd:a][pe:c][re:b]C[Black punishes on 'a'.
 Black 'b' is too mild.
 Black 'c' is goes for influence.
+]
 (;B[pd]
 ;W[pe]LB[oc:B][oe:A]C['b' takes the top side, 'a'aims for the right side and can be difficult.
+]
 (;B[oe]LB[oc:B][ne:A]C['a' is necessary, 'b' fails.
+]
 (;W[ne]
 ;B[of]
 ;W[nd]
 ;B[re]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rd]LB[rg:a]C[White now has to crawl along the second line to live (if he can),
 beginning with 'a'. The result is a disaster for White.])
 (;W[oc]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[qg]
 ;B[of]LB[pb:B][pg:A]C[White 'a' or 'b'.
+]
 (;W[pg]
 ;B[pb]
 ;W[ob]
 ;B[mb]
 ;W[qb]
 ;B[pc]
 ;W[pa]
 ;B[rb]
 ;W[ra]
 ;B[rc]
 ;W[se]
 ;B[nd]
 ;W[sd]
 ;B[sb]
 ;W[sf]
 ;B[nb]
 ;W[sc]
 ;B[nc]
 ;W[oa]
 ;B[na]
 ;W[qa]
 ;B[pf]
 ;W[qf])
 (;W[pb]
 ;B[pg]
 ;W[qf]
 ;B[qi]
 ;W[ph]
 ;B[oh]
 ;W[rj]LB[qh:A][ri:B]C[White has a tesuji to connect on the right side if somewhere on the 3rd line of the right side, there's a White stone.
 'a' presses White down, 'b' lets White out.
+]
 (;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[si]
 ;B[qj]
 ;W[rk]
 ;B[sg]C[Black lives in the corner.
 ])
 (;B[ri]
 ;W[pi]
 ;B[qj]
 ;W[qh]))))
 (;B[oc]LB[nc:A][oe:B]C[Black creates a large corner.
 'a' is better than 'b'.]
 (;W[nc]C[White 8 creates aji.]
 ;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[pi])
 (;W[oe]
 ;B[nc])))
 (;B[re]C[Black 5 is a mistake; a lost opportunity for Black to punish White for an unreasonable move.
+]
 ;W[pe]
 ;B[rf]
 ;W[qc]
 ;B[rd]
 ;W[oc])
 (;B[pe]C[Black 'c' aims for influence and misses to punish.
+]
 ;W[pd]
 ;B[qf]
 ;W[re]
 ;B[qc]
 ;W[rf]C[Black sacrifices the corner for the outside.]
 ;B[oe]LB[pb:A][ne:B]C['a' takes the corner, 'b' is wrong.
+]
 (;W[pb]
 ;B[qb]
 ;W[rd]
 ;B[qg]
 ;W[pc])
 (;W[ne]
 ;B[pg]LB[nd:B][qg:C][rg:A]C['a' and 'b' are miai, 'c' is bad.
+]
 (;W[rg]
 ;B[nd])
 (;W[nd]
 ;B[rg])
 (;W[qg]
 ;B[nd]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[ph]
 ;B[lf]C[Black has much more points.
 ]))))
 (;W[pf]LB[oe:a][qf:b]C[White 4 is a mistake.
 Black continues with a sacrifice at 'a'. White 'b' is not recommended.]
 (;B[oe]C[Black 5 is a sacrifice play.]
 ;W[pe]
 ;B[pd]LB[oc:b][ne:a]C[White may try 'a' or 'b'.]
 (;W[ne]
 ;B[oc]
 ;W[of]
 ;B[nd])
 (;W[oc]C[White 8 resists the outcome of the variation of White 8 onto
 the marked point, but a difficult fight starts.]MA[ne]
 ;B[of]
 ;W[pg]
 ;B[pc]C[If you know the follow-up, please email: kogo@waterfire.us.
 ]))
 (;B[qf]C[Black 5 makes White 4 a successful move.]
 ;W[pg]
 ;B[qg]C[Black 5 & 7 help secure the corner at the expense of the top.]
 ;W[ph]C[The pincer of Black 3 has lost its value.])))
 (;B[ld]LB[qc:e][pd:g][qe:c][of:a][pf:d][og:h][pg:b][ph:i][dp:f]TR[pj]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong =  E`r Gaojia
 ------------------------------------------------------------------------------
 Black 3 is a relatively modern invention. It is a severe move that restricts White's movements.
 It's also a punishment if White 2 was wrong, because Black has additional stone on the triangled position, like in the Kobayashi Fuseki.
 White responds with 'a', 'b', 'c' or 'd' (joseki).
 One of the variations after 'c' is called "the magic sword of Muramasa". Although its joseki are not difficult, its mistake refutations are hair-raising.
 White 'd' was considered inferior until a new joseki variation was developed.
 White 'e' is unfavorable with this pincer, as the pincer is in the way of White's extension.
 Var 5 ('f') shows White playing elsewhere (which is rare).
 'g' is not recommended.
 'h' is inferior.
 'i' is a special strategy, if White has something like the High Chinese Fuseki on the lower side.
 g7, f6, e5, d4, c3, b2, a1
 joseki outcomes:
 a1 - Black right, White top
 b2 - Black choice of right or top
 c3 - Black choice or right or top
 d6 - Black top, White right, each side has a group on the run
 e4 - Black right
 f5 - Black right
 g7 - Black right; White top (not good for White)
+]
 (;W[of]LB[qf:a][pg:c][qg:b]C[Black continues with 'a' or 'b'.
 'c' is impossible.]
 (;B[qf]LB[qc:B][oh:A]C['a' is joseki, 'b' is possible.]
 (;W[oh]LB[pg:B][qh:A]TR[pj]C['a' is usual. If there is already an additional Black stone on the triangled position like in the Kobayashi Fuseki, White 2 wrong and Black punishes on 'b'.
+]
 (;B[qh]
 ;W[id]C[
 * Joseki *])
 (;AW[dp][pp][nq]AB[dd][pj][qn]
 ;B[pg])
 (;B[oc]
 ;W[md]))
 (;W[qc]
 ;B[rc]LB[pc:B][oh:A]C['a' is correct, 'b' is too early.]
 (;W[oh]
 ;B[qh]
 ;W[id]LB[rb:B][pc:A]C[Later, White can choose to play 'a' or, if the fight in the middle has become less important than making points in the corner, 'b'.
 Black 'a' is gote.]
 (;W[pc])
 (;W[rb]LB[pc:A][rd:B]C['a' or 'b'.]
 (;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc])
 (;B[rd]
 ;W[pc]))
 (;B[pc]
 ;W[oc]LB[qb:A][dp:B]C[Black must capture on 'a', tenuki 'b' is not recommended.]
 (;B[qb])
 (;B[dp]
 ;W[qb]
 ;B[pd]
 ;W[pb])))
 (;W[pc]
 ;B[rb])))
 (;B[qg]LB[qc:C][oh:A][ph:B]C['a' is correct. 'b' is a mistake. 'c' is possible.]
 (;W[oh]
 ;B[pi]
 ;W[id])
 (;W[ph]
 ;B[pg]
 ;W[og]
 ;B[oh]
 ;W[pj]
 ;B[nh]
 ;W[qh]
 ;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[mf])
 (;W[qc]
 ;B[rc]
 ;W[pc]LB[rb:B][re:A]C['a' or 'b'.]
 (;B[re])
 (;B[rb]
 ;W[qf]
 ;B[rf]
 ;W[qe]
 ;B[re]
 ;W[pd]
 ;B[rd]
 ;W[pg]
 ;B[qh])))
 (;B[pg]
 ;W[qe]
 ;B[pe]
 ;W[pf]
 ;B[qf]
 ;W[re]))
 (;W[pg]LB[oc:f][pd:b][oe:a][of:c][pf:d][qf:e]C[White 4 was invented by Fujisawa Kuranosuke (Hosai) in a jubango against Go Seigen in 1952.
 Black continues with 'a', 'b' or 'c'. Black 'c' is still somewhat experimental.
 'd' is difficult to answer.
 'e' is possible.
 'f' is not recommended.]
 (;B[oe]LB[pd:c][ne:a][pe:b]C[White continues in joseki with 'a'.
 White 'b' and 'c' are mistakes.]
 (;W[ne]LB[pd:b][pe:c][of:a]C[Black continues with 'a', the main joseki, or 'b', a more recent innovation.
 Black 'c' is slow, and not recommended.]
 (;B[of]LB[qc:B][pd:A]C['a' makes a small group on the side which still can push outside.
 'b' takes a larger White group on the side and gives Black
 a wall.]
 (;W[pd]LB[pe:B][qe:C][qf:A]C[Black continues with 'a', 'b' or 'c'.]
 (;B[qf]LB[qc:A][pe:C][nf:B]C[White continues with 'a'. 'b' is inferior. White 'c' used to
 be considered vulgar, but opinion may be changing.]
 (;W[qc]LB[rd:B][qe:A]C[White is testing, if Black reacts on 'a' or 'b'. 'b' is better if Black is strong, because it allows to attack White better.
+]
 (;B[qe]LB[nc:C][md:D][le:B][qe:11][nf:A]C[Now that Black played Black 11 this way, White continues with 'a'.
 'b' is also possible. White 'c' and 'd' are not recommended.
 'c' was considered joseki before being replaced by 'a'.
+]
 (;W[nf]LB[nd:B][og:A]C['a' is correct. 'b' is a mistake.]
 (;B[og]LB[pb:A][rc:B]TR[pj]C['a' is easy.
 'b' is possible if White has the ladder and there's no Black
 stone on the triangled position.]
 (;W[pb]LB[lc:A][mc:B][rc:F][ld:3][rd:E][lg:D][ng:C]C[
 * Joseki *
 Later, Black can easily use Black 3 to create territory on the top side, because Black 'a' or 'b' are sente. Black can also later play 'c'.
 In some fuseki, Black can try the ambitious move of 'd'.
 Later, the correct endgame for White in the corner, is 'e', not F,
 because if he playes on F the result is the same as if Black plays in sente on E.
+]
 (;B[ng]LB[le:A][lf:B]C['a' is correct. 'b' is a mistake.]
 (;W[le]
 ;B[ke])
 (;W[lf]
 ;B[nd]
 ;W[md]
 ;B[me]
 ;W[nc]
 ;B[mf]
 ;W[le]
 ;B[nd]
 ;W[ne]
 ;B[kd]))
 (;AW[dd]AB[ch][ql]PL[B]
 ;B[lg]
 ;W[ng]
 ;B[fc]
 ;W[cf]
 ;B[fe]
 ;W[oh]
 ;B[ph]
 ;W[pi]
 ;B[qh])
 (;W[rd]
 ;B[re]
 ;W[rc]))
 (;W[rc]LB[nd:B][pj:A]C['a' is usual. 'b' starts the ladder.]
 (;B[pj]LB[nc:A][dp:B]C['a' is correct, tenuki 'b' is a mistake.]
 (;W[nc])
 (;W[dp]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]
 ;B[me]
 ;W[kb]
 ;B[kc]
 ;W[lb]
 ;B[lg]
 ;W[mg]
 ;B[mf]
 ;W[ng]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[oh]
 ;B[ph]
 ;W[oi]
 ;B[oj]
 ;W[pi]
 ;B[qi]))
 (;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]LB[nb:B][oc:A]C['a' is correct, 'b' is a trick move.
+]
 (;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]LB[qb:B][me:A]C['a' or 'b'.]
 (;B[me]
 ;W[kb]LB[jb:B][kc:A]C['a' is correct, 'b' is a disadvantageous trick move.
+]
 (;B[kc]
 ;W[lb]
 ;B[lg]
 ;W[mg]
 ;B[mf]
 ;W[ng]
 ;B[nh]
 ;W[mh]
 ;B[mi])
 (;B[jb]
 (;W[lb]C[Refusal of the trick.
 ])
 (;W[kc]C[Bad answer]
 ;B[jc]
 ;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[mf]
 ;W[ng]
 ;B[nh]
 ;W[mg]
 ;B[lh]C[White is dead])))
 (;B[qb]
 ;W[rb]
 ;B[me]LB[kb:A][kc:B]C['a' ladder, 'b' mistake.]
 (;W[kb]LB[jb:B][kc:A]C['a' is correct, 'b' is a disadavantageous trick play.
+]
 (;B[kc]
 ;W[lb]LB[mf:A][lg:B]C[Black can start the ladder on 'a' or 'b'. If he wants to guide the ladder to the right side, he must play 'b'.
+]
 (;B[mf]
 ;W[ng]
 ;B[nh]
 ;W[mg]
 ;B[lg]
 ;W[mh]
 ;B[mi])
 (;B[lg]
 ;W[mg]
 ;B[mf]
 ;W[ng]LB[mh:B][nh:A]TR[pj]C['a' guides the ladder to the lower left. 'b' turns the the ladder to the right, if there's a Black stone on the triangled position.
+]
 (;B[nh]
 ;W[mh]
 ;B[mi]
 ;W[lh]
 ;B[kh])
 (;AB[pj]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[oh]
 ;B[ph]
 ;W[oi]
 ;B[oj]
 ;W[pi]
 ;B[qi])))
 (;B[jb]
 ;W[lb]C[Refusal of the trick.
 ]))
 (;W[kc]
 ;B[ma]LB[la:B][lb:A]C['a' is necessary, 'b' fails.]
 (;W[lb]
 ;B[ra]
 ;W[na]
 ;B[rd]
 ;W[oa]
 ;B[pe]
 ;W[sb]
 ;B[sd]
 ;W[la]
 ;B[sc])
 (;W[la]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[na]
 ;B[ka]))))
 (;W[nb]
 ;B[oc]
 ;W[pc]
 ;B[mb]LB[na:A][lb:B]C['a' is correct. IF 'b', White's corner dies.
+]
 (;W[na]
 ;B[lc]
 ;W[me]
 ;B[ma]
 ;W[lb]
 ;B[oa]
 ;W[kb]LB[jb:A][jc:B]C['a' refuses the trick, 'b' doesn't.
+]
 (;B[jb]
 ;W[jc]
 ;B[ib]LB[kc:A][le:B]
 (;W[kc]
 ;B[ra]
 ;W[rd]
 ;B[re]
 ;W[pb]
 ;B[pa]
 ;W[qa]
 ;B[qb]
 ;W[rb]
 ;B[qa]
 ;W[sa]
 ;B[sb]
 ;W[sc]
 ;B[pe]
 ;W[sa]C[3-move-approach ko for White.
 ])
 (;W[le]
 ;B[ka]
 ;W[kc]
 ;B[la]))
 (;B[jc]
 ;W[jb]LB[ib:B][ic:A]C['a' or 'b' don't work.
+]
 (;B[ic]
 ;W[pb]
 ;B[ib]
 ;W[pa]
 ;B[kc]
 ;W[na]
 ;B[nb]
 ;W[la]
 ;B[ja]
 ;W[na])
 (;B[ib]
 ;W[ic]
 ;B[hb]
 ;W[jd])))
 (;W[lb]
 ;B[na]
 ;W[lc]
 ;B[pb]
 ;W[qb]
 ;B[pa]
 ;W[rd]
 ;B[re]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[sd]
 ;W[le])))))
 (;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[pb]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[og]
 ;B[rh]
 ;W[ic]C[White is superior.]
 ;B[rd]
 ;W[qi]
 ;B[ri]
 ;W[qk]LB[rb:A][dp:B]C[White's influence is superior. Black can play 'a' or tenuki 'b'.]
 (;B[rb])
 (;B[dp]
 ;W[rc]LB[ib:B][rj:A]C[White can reduce Black's corner by forcing Black to take out the White stones on 'a' or 'b'.])))
 (;W[le]
 ;B[rc]LB[kd:b][md:a]C[White continues with 'a' or 'b'.]
 (;W[md]
 ;B[qb]LB[hd:A][id:B]C[Later, White occupies 'a' or 'b'.])
 (;W[kd]
 ;B[qb]
 ;W[lc]))
 (;W[nc]
 ;B[rc]
 ;W[qb]C[Black gets a better result.]
 ;B[qj])
 (;W[md]C[White 12 is not recommended, as it provokes Black to strengthen his stone.]
 ;B[le]
 ;W[rc])
 (;W[mc]C[New plan, invented by Lee Sedol]
 (;B[lc]
 ;W[rc])
 (;B[rc]
 ;W[lc]
 ;B[qb]
 ;W[ic]C[New joseki])))
 (;B[rd]LB[rd:11][pg:4]TR[nf]C[Now that Black has played this Black 11, White must not push on the triangled point and damage White 4.]
 ;W[nc]
 ;B[rc]
 ;W[qb]LB[mb:B][md:A][pj:C]C[Black can attack the White group on  'a'. The attack on 'b' is less powerful.
 'c' strengthens the right group and treats the top stone lightly, allowing White to settle easily.
+]
 (;B[md]
 ;W[nd]
 ;B[mb]C[The move induces White to force Black to strenghen himself.
+]
 ;W[nf]
 ;B[og])
 (;B[mb]C[Later, the following continuation may occur.]
 ;W[mf]
 ;B[id]
 ;W[qg])
 (;B[pj]
 ;W[lb])))
 (;W[nf]LB[qc:b][og:a]C['a' is correct. 'b' is a mistake.]
 (;B[og]
 ;W[qc]LB[qc:12][rd:A][qe:B][nf:10]C[Now that White has played White 12 and White 10 in the wrong order, Black punishes on 'a'. 'b' reverts to the usual joseki.]
 (;B[rd]LB[pb:A][rc:B][pg:4]C['a' is correct, 'b' is possible with the ladder.
 Now White 4 is damaged without reason.]
 (;W[pb])
 (;W[rc]
 ;B[nd]LB[md:A][pe:B]C['a' is correct. 'b' is a mistake.]
 (;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]
 ;B[me]
 ;W[kb]
 ;B[kc]
 ;W[lb]
 ;B[lg])
 (;W[pe]
 ;B[pf]
 ;W[qe]
 ;B[re]
 ;W[sd]
 ;B[rf]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[pc])))
 (;B[qe]LB[pb:A][rc:B]C['a' is joseki. 'b' is possible if White has the ladder.]
 (;W[pb]LB[nd:a]TR[pe]C[
 White 14 protects the cutting point at 'a', as long as White
 has the triangled liberty.])
 (;W[rc]LB[rc:14][nd:B][pj:A]C[White 14 was played by Hane Naoki Kisei in a Kisei title match January 14, 2006 in Berlin.
 'a' is usual. 'b' starts the ladder.]
 (;B[pj]LB[nc:A][dp:B]C['a' is correct. Tenuki 'b' is wrong.]
 (;W[nc])
 (;W[dp]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]
 ;B[me]
 ;W[kb]
 ;B[kc]
 ;W[lb]
 ;B[lg]
 ;W[mg]
 ;B[mf]
 ;W[ng]
 ;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[oh]
 ;B[ph]
 ;W[oi]
 ;B[oj]
 ;W[pi]
 ;B[qi]))
 (;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[pc]
 ;B[me]
 ;W[kb]
 ;B[kc]
 ;W[lb]
 ;B[lg]
 ;W[mg]
 ;B[mf]
 ;W[ng]
 ;B[nh]
 ;W[mh]
 ;B[mi]))))
 (;B[qc]C[Black 11 is not recommended.]
 ;W[og]
 ;B[qe]
 ;W[mg]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]C[White's influence exceeds Black's profit.]))
 (;W[pe]C[White 10 used to be considered a vulgar mistake, but this variation has been played professionally and found satisfactory.]
 ;B[pf]
 ;W[qe]
 ;B[nd]LB[nc:a][rf:b]C[White 'a' is the traditional continuation. White 'b' is recent.]
 (;W[nc]
 ;B[md]
 ;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qg]LB[lb:a][dp:b]C[White 'a' is an important follow-on. 'b' shows the impact of White playing elsewhere.]
 (;W[lb])
 (;W[]
 ;B[nb]
 ;W[ob]
 ;B[mc]
 ;W[oc]))
 (;W[rf]C[White 14 was played in a 1979 Nie-Sonoda match and the players consider the result even.]
 ;B[rg]
 ;W[rd]
 ;B[qg]
 ;W[nc]
 ;B[md]C[White has a solid large corner.])))
 (;B[pe]
 ;W[qc]LB[rc:c][qe:a][re:b]C[Black continues with 'a' (Black sente) or 'b' (Black gote).
 Black 'c' is a trick play that can be foiled.]
 (;B[qe]
 ;W[nc]
 ;B[rc]
 ;W[qb]C[
 * Joseki *])
 (;B[re]LB[rc:b][rd:a]C[White continues with 'a'. White 'b' gives a slightly unfavorable result.]
 (;W[rd]
 ;B[qe]
 ;W[nc]
 ;B[rc]
 ;W[rb]
 ;B[sd]C[
 * Joseki *
 The joseki concludes.]
 ;W[]LB[mb:a][qb:b]C[White plays elsewhere.
 Black follows up with 'a' or 'b'.]
 (;B[mb]
 ;W[pb])
 (;B[qb]
 ;W[lb]
 ;B[pc]
 ;W[mf]C[White 22 is correct shape.]))
 (;W[rc]
 ;B[nd]
 ;W[nc]
 ;B[md]LB[mb:a][ob:b]))
 (;B[rc]LB[rd:b][qe:a]C[Black 11 is a trick play. White counters with 'a'. White falls into a trap with 'b'.]
 (;W[qe]C[White counters the trick play.]
 ;B[rd]LB[md:A][qf:B]C['a' is modern Korean style and better than 'b', old Japanese style.]
 (;W[md]LB[le:A][qf:B]C[Black must choose if he allows White to united his stones after 'a' or if he allows White to make his pincer stones uninteresting after 'b'.]
 (;B[le]
 ;W[qf]
 ;B[pc]
 ;W[oc]
 ;B[qb]
 ;W[mg]
 ;B[ob]LB[nf:A][og:B]C['a' is correct, 'b' nonsense.]
 (;W[nf]C[All White stones united.])
 (;W[og]
 ;B[nf]
 ;W[mf]
 ;B[me]
 ;W[nd]
 ;B[mc]))
 (;B[qf]
 ;W[lc]))
 (;W[qf]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[pc]LB[pa:b][mb:a]C[White 22 is a good move. Black 'a' doesn't work because of White 'b'. Black 'b' is the only move, but it falls short.]
 ;B[pa]
 ;W[lb]LB[ra:a][pb:b]C[Black must play 'a'. Black 'b' is a fatal mistake.]
 (;B[ra]
 ;W[mb]
 ;B[re]C[Both sides live.])
 (;B[pb]C[Black 25 is a serious mistake. Black dies.]
 ;W[oc]
 ;B[kb]
 ;W[mb]
 ;B[lc]
 ;W[ra]
 ;B[sa]
 ;W[ka]
 ;B[jb]
 ;W[na]
 ;B[la]
 ;W[re]C[Black comes up short. Time to resign.])))
 (;W[rd]C[White falls into a trap.]
 ;B[qe]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[re])))
 (;B[qe]LB[qc:A][pe:B]C['a' is correct. 'b' is a mistake if Black has the ladder.]
 (;W[qc]
 ;B[rc]
 ;W[pe]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;B[pf]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[og]
 ;W[rb]LB[qb:C][rg:D][oh:B][ph:A]C['a' is correct, 'b', 'c' and 'd' are not recommended.]
 (;B[ph]
 ;W[qh]
 ;B[pc]
 ;W[qb]
 ;B[qi]
 ;W[oh]
 ;B[mf]
 ;W[pi]
 ;B[oc]
 ;W[nd]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[nf]
 ;W[rg]C[Later]
 ;B[md]
 ;W[sf]
 ;B[me]
 ;W[se])
 (;B[oh]
 ;W[rg]
 ;B[pc]
 ;W[qb]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[rh]
 ;W[qh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[sh]
 ;B[oj])
 (;B[qb]
 ;W[oh]
 ;B[mf]
 ;W[me]
 ;B[nh]
 ;W[oi]LB[le:B][lf:A]C['a' without the ladder, 'b' with the ladder.]
 (;B[lf]
 ;W[pc]
 ;B[sb]
 ;W[rd]
 ;B[ra]
 ;W[re])
 (;B[le]
 ;W[mg]
 ;B[lf]
 ;W[nf]
 ;B[ng]
 ;W[mh]
 ;B[ni]
 ;W[nj]))
 (;B[rg]
 ;W[rd]
 ;B[re]
 ;W[sc]LB[nd:B][ph:A]C['a' or 'b' don't help.]
 (;B[ph]
 ;W[me])
 (;B[nd]
 ;W[nc]LB[md:B][ph:A]C['a' or 'b' don't help.]
 (;B[ph]
 ;W[md])
 (;B[md]
 ;W[oh]
 ;B[mf]
 ;W[nh]LB[mg:A][qi:B]C['a' or 'b' don't help.]
 (;B[mg]
 ;W[rh]
 ;B[qh]
 ;W[ph]
 ;B[qi]
 ;W[ri]LB[qj:A][rj:B]C['a' or 'b' don't help.]
 (;B[qj]
 ;W[rj]LB[qk:B][rk:A]C['a' or 'b' don't help.]
 (;B[rk]
 ;W[qk]
 ;B[rl]
 ;W[pj])
 (;B[qk]
 ;W[sg]))
 (;B[rj]
 ;W[qj]
 ;B[pi]
 ;W[pj]
 ;B[oi]
 ;W[rk]))
 (;B[qi]
 ;W[ph]
 ;B[nf]
 ;W[rh]
 ;B[qh]
 ;W[ri])))))
 (;W[pe]
 ;B[pf]
 ;W[qf]LB[og:B][qg:A]C['a' with the ladder, 'b' without.]
 (;B[qg]
 ;W[rf]LB[og:B][rg:A]
 ;B[rg]
 ;W[og]C[This ladder mustn't work.]
 ;B[nf]
 ;W[mf])
 (;B[og]C[If the ladder is unfavorable to Black.]
 ;W[qc]C[White 14 is the vital point.]
 ;B[rf]
 ;W[qg]
 ;B[rc]LB[qc:14][pe:10]C[Same variation as White 14 played before White 10]))))
 (;W[qc]LB[rc:B][qf:A]C['a' is ok. 'b' is getting tricked.]
 (;B[qf]LB[qc:8][pd:B][rd:A]C['a' is the joseki continuation White 8 is aiming for. White 'b' just reverts to the older joseki.]
 (;W[rd]LB[pc:A][nd:B][re:C]C['a' is joseki leaving little aji in the Black wall, 'b' is a fighting joseki.
 'c' is a mistake.]
 (;B[pc]
 ;W[pd]
 ;B[qe]
 ;W[rc]LB[nc:A][nd:B]C['a' is joseki.
 'b' is similar.]
 (;B[nc]LB[nc:15][oc:A][nd:B]C['a' is ok.
 'b' foolishly starts a difficult fight where White suffers.]
 (;W[oc]
 ;B[nd]C[
 * Joseki *])
 (;W[nd]
 ;B[oc]
 ;W[mc]
 ;B[mb]
 ;W[lb]
 ;B[lc]
 ;W[md]
 ;B[nb]
 ;W[kb]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[qa]
 ;B[le]
 ;W[mf]
 ;B[oa]LB[ma:A]C[Soon, White has to force a seki on 'a'.
 Black can kill the corner on 'a'.]
 (;W[ma]
 ;B[re]
 ;W[sd]
 ;B[ra]
 ;W[sa]
 ;B[se]
 ;W[ra]
 ;B[sb]C[White has two weak groups, Black only one, so White is in an inferior position.])
 (;B[ma]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[ra]
 ;W[sa]
 ;B[sc])))
 (;B[nd]LB[nc:B][oc:A]C['a' is sente, 'b' takes more points, but is gote.]
 (;W[oc]LB[nc:A][dp:B]C['a' is necessary, tenuki 'b' is nonsense.]
 (;B[nc])
 (;B[dp]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nb]
 ;W[mb]
 ;B[me]
 ;W[nf]
 ;B[mf]
 ;W[ng]
 ;B[ob]
 ;W[pb]
 ;B[lc]
 ;W[oa]))
 (;W[nc]
 ;B[md]
 ;W[oc])))
 (;B[nd]
 ;W[oc]
 ;B[re]
 ;W[pd]
 ;B[qe]
 ;W[md]
 ;B[me]
 ;W[nc]
 ;B[nf]
 ;W[le]
 ;B[nd]
 ;W[mc]
 ;B[kd]
 ;W[lf]
 ;B[je]
 ;W[rc]
 ;B[qk]
 ;W[mf]
 ;B[ne]
 ;W[lh]
 ;B[nh]
 ;W[jg])
 (;B[re]
 ;W[pd]
 ;B[qe]
 ;W[nc]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[qb]LB[re:11]C[White's position is better than after the joseki, so Black 11 is wrong.]))
 (;W[pd]
 ;B[qe]
 ;W[nf]
 ;B[og]
 ;W[pb]))
 (;B[rc]LB[pd:A]
 (;W[pd])
 (;W[pd]LB[pe:A][qe:B]C['a' or 'b'. Black must have the ladder for 'b'.]
 (;B[pe]
 ;W[qe]
 ;B[rd]
 ;W[qf]
 ;B[qb]
 ;W[md]
 ;B[le]
 ;W[mg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[ng]
 ;B[qg]
 ;W[nf])
 (;B[qe]
 ;W[pe]
 ;B[pf]
 ;W[qf])))))
 (;B[pd]C[Black 7 first appeared in a title game in 1975 by Hashimoto Shoji against Rin Kaiho for the 13th Judan Title.]
 ;W[of]
 ;B[oc]
 ;W[pe]
 ;B[nc]C[White is locally better])
 (;B[pe]LB[md:b][nf:a]C[Black 7 is slow.
 White continues with 'a'. White 'b' results in poor shape.]
 (;W[nf]LB[pc:a][nd:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[nc])
 (;B[nd]C[The cut of Black 9 is obvious, and a mistake.]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[oc]
 ;W[le]C[White has wonderful shape to the top left.]))
 (;W[md]C[White 8 is not recommended, as White does not get good shape.]
 ;B[nf]
 ;W[mf]
 ;B[ng]C[White has poor shape.])))
 (;W[pe]C[White 6 is a mistake.]
 ;B[pd]LB[oc:B][ne:A]C['a' is correct, 'b' is questionable.]
 (;W[ne]
 ;B[of]
 ;W[pf]LB[oc:a][nd:c][nf:b][og:d]C[Black can connect underneath with 'a' and gets a favorable result.
 If White cannot get a ladder with 'b', Black simply cuts at 'c'.
 'd' is possible.]
 (;B[oc]
 ;W[nd]
 ;B[nc]
 ;W[ng])
 (;B[nd]C[Black plays 11 if White does not have the ladder.]
 ;W[oc]
 ;B[nc])
 (;B[og]
 ;W[oh]
 ;B[mf]))
 (;W[oc]
 ;B[ne]
 ;W[qe]
 ;B[re]))
 (;W[pd]C[White 6 is a mistake in direction. White should first go to the outside, not inside.]
 ;B[pe]
 ;W[qc]LB[nd:b][qe:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qe]LB[nd:a][ne:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[ne]
 ;W[rc]
 ;B[md])
 (;W[ne]C[White 10 is unreasonable.]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[rc]
 ;B[nf]C[Black retains potential for a later squeeze play on White's corner stones.]))
 (;B[nd]C[Black 9 is an overplay.]
 ;W[qe]
 ;B[rd]
 ;W[rc]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[sd]LB[ne:b][pf:a]C[Black is left with cutting points at 'a' and 'b'.])))
 (;B[pd]
 ;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[nd]LB[ob:c][mc:a][pc:b]C[White continues with 'a'. White 'b' is also possible. White 'c' is a mistake.]
 (;W[mc]LB[ob:a][pc:d][md:c][ne:b]C[Black plays 'a' or 'b'.
 'c' and 'd' are miai.]
 (;B[ob]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[pe]
 ;B[og]C[The results from this are favorable to White.]
 ;W[qe]
 ;B[ph]
 ;W[qg]LB[qb:a][qh:b]C[Black 'a' saves the corner.
 Black 'b' is unreasonable.]
 (;B[qb]C[Black 21 is necessary to save the corner.]
 ;W[qh]
 ;B[pi]
 ;W[rj])
 (;B[qh]C[Black 21 unreasonable.]
 ;W[rh]
 ;B[ri]
 ;W[rf]
 ;B[sh]
 ;W[rg]
 ;B[oh]
 ;W[rd]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[qc]LB[pc:b][re:a][oh:27]C[White takes the corner because Black must play 27 to defend against the cut.
 Black may try 'a' or 'b'.]
 (;B[re]
 ;W[pc]
 ;B[rd]LB[pb:a][qb:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[sf]
 ;W[sb]
 ;B[pf]
 ;W[sc]
 ;B[of]
 ;W[se])
 (;W[qb]C[White 36 is a mistake. White loses by a move.]
 ;B[pf]C[Black 37 is the tesuji.]
 ;W[qf]LB[of:a][sf:b]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[sf]
 ;B[si])
 (;B[sf]
 ;W[of]
 ;B[sg])))
 (;B[pc]
 ;W[sc]
 ;B[qb]
 ;W[rc])))
 (;B[ne]
 ;W[ob]
 ;B[pc]
 ;W[pe]LB[pb:a][lc:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pb]
 ;W[lc]
 ;B[kd]
 ;W[jc])
 (;B[lc]C[Black 15 is unreasonable.]
 ;W[lb]
 ;B[kb]
 ;W[pb]
 ;B[qb]
 ;W[rb]LB[pa:a][qa:b]C[Black continues with 'a'. Black 'b' looks better, but is worse.]
 (;B[pa]
 ;W[nb]LB[jc:b][rc:a]C[Black saves the corner with 'a', or protects against the cut with 'b' (and thereby loses the corner).]
 (;B[rc]
 ;W[kc])
 (;B[jc]
 ;W[rc]))
 (;B[qa]C[Black 21 loses the corner.]
 ;W[nb]
 ;B[la]
 ;W[rc]
 ;B[qc]
 ;W[rd]
 ;B[qe]
 ;W[qf]
 ;B[re]
 ;W[ra]))))
 (;W[pc]C[White 10 is intended as a sacrifice play in the corner for the right side, though Black has options.]
 ;B[ob]
 ;W[pb]
 ;B[nb]
 ;W[rc]LB[qc:a][rd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pa]
 ;W[sa]
 ;B[rb]
 ;W[sb]
 ;B[oa]
 ;W[rd]
 ;B[qa]
 ;W[qe]
 ;B[rb]
 ;W[qb]LB[mc:a]C[
 * Joseki *])
 (;B[rd]C[Black 15 is not recommended.]
 ;W[qc]
 ;B[rg]
 ;W[pe]
 ;B[qf]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kb]
 ;W[md]
 ;B[me]
 ;W[la]
 ;B[ne]
 ;W[le]
 ;B[pf]
 ;W[of]
 ;B[ng]
 ;W[og]
 ;B[kd]
 ;W[mg]
 ;B[lf]
 ;W[mf]
 ;B[ke]
 ;W[nf]
 ;B[le]
 ;W[qg]C[White gets the right, Black the top. White comes out ahead.]))
 (;W[ob]C[White 10 is vulgur.]
 ;B[pc]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[mc]
 ;B[of]C[It is hard to imagine this result favoring White. Losing the
 two White stones is bad.]))
 (;B[of]LB[pe:b][pf:c][og:a]C[Black 'c' was popular among leading amateur players, and is a relatively recent introduction to professional Go, so all variations have not been explored.
 White 'a' and 'b' are feasible. White 'c' is probably unreasonable.]
 (;W[og]C[White 6 temporarily sacrifices the approach stone.]
 ;B[oe]LB[nd:a][pd:b]C[After Black 7 White plays elsewhere. Black will probably add a move at 'a' or 'b' at an early stage.])
 (;W[pe]C[This comes from Kajiwara (W) vs. Kuwahara (W), preliminary round, 14th Judan Title (1975).]
 (;B[pf]
 ;W[qe]
 ;B[qf]
 (;W[rf]LB[rd:B][qg:A]C['a' or 'b' are ok. 'a' is the Japanese, 'b' the Korean variation.]
 (;B[qg]
 ;W[rd]
 ;B[nd]
 ;W[nc]
 ;B[oe]LB[oc:a][pd:b]C[White continues with 'a' or 'b'.]
 (;W[oc]
 ;B[mc]
 ;W[ne]
 ;B[md]C[White ends in sente, but Black has a good endgame move]
 ;W[dp]C[White plays elsewhere.]
 ;B[pd]C[Black's endgame moves that are sente, and leave White with a small corner.]
 ;W[re]
 ;B[pb]
 ;W[pc]
 ;B[nb]
 ;W[qc])
 (;W[pd]
 ;B[mc]
 ;W[ne]
 ;B[md]C[Next, White plays elsewhere.]))
 (;B[rd]
 ;W[re]
 ;B[qg]
 ;W[qc]LB[pc:B][nd:A]C['a' is correct, 'b' a mistake.]
 (;B[nd]
 ;W[nc]
 ;B[oc]
 (;W[pc]
 ;B[oe]LB[ob:B][pd:A]C['a' lets Black close the top, 'b' the right side. 'a' is usually coherent with the aim of the joseki choice.]
 (;W[pd]
 ;B[mc]
 ;W[ob]C[Joseki])
 (;W[ob]
 ;B[pd]
 ;W[oc]
 ;B[rg]
 ;W[rc]))
 (;W[ob]
 (;B[oe]
 ;W[pd]
 ;B[mc]
 ;W[nb]C[Joseki])
 (;B[pd]
 ;W[oe]
 ;B[pc]C[Complicated Korean joseki])))
 (;B[pc]
 ;W[pd]LB[qb:A][rc:B]C['a' is disadvantageous; 'b' is getting killed.]
 (;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[sd]
 ;B[oc]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc])
 (;B[rc]
 ;W[qb]))))
 (;W[rd]
 ;B[rf]
 ;W[qc]C[Old fashion. Black is better]))
 (;B[oc]
 ;W[nc]
 ;B[nd]C[Trickmove]))
 (;W[pf]C[White 6 is not recommended.]
 ;B[oe]
 ;W[pe]
 ;B[pd]
 ;W[oc]LB[pb:b][og:a]C[Black continues with 'a'. Black 'b' is an odd move, and a mistake.]
 (;B[og]
 ;W[ph]
 ;B[oh]
 ;W[pi]
 ;B[nd]LB[nc:b][oi:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[oi]
 ;B[nc])
 (;W[nc]C[White 16 takes on an unreasonable fight.]
 ;B[mc]
 ;W[ne]
 ;B[md]
 ;W[qb]
 ;B[rb]LB[ra:a][pb:b]C[White sets up a ko with 'a', or a downright loss with 'b'.]
 (;W[ra]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[pa]C[White sets up a ko, but has no local ko threats.])
 (;W[pb]
 ;B[rc]
 ;W[re]LB[ra:a][nb:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ra]C[Black 25 is the tesuji that gives Black enough liberties to win the fight.]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[la])
 (;B[nb]C[With Black 25, the fight becomes favorable to White.]
 ;W[ra]C[The vital point.]))))
 (;B[pb]C[Black 11 is a mistake.]
 ;W[ob]
 ;B[pc]
 ;W[og]
 ;B[me]
 ;W[lb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[re]
 ;B[qe]
 ;W[rf]
 ;B[rd]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gc]
 ;W[kc]
 ;B[kd]
 ;W[mc])))
 (;B[pf]
 ;W[of]
 ;B[og]C[Overplay]
 ;W[pe]
 ;B[qf]
 ;W[qe]
 ;B[nf]
 ;W[oe])
 (;B[qf]
 (;W[of]LB[id:A][qg:B]C[Kosumi looks strange; instead, 'a' or 'b'.]
 (;B[id]
 ;W[qg])
 (;B[qg]
 ;W[pi]
 ;B[ph]
 ;W[oh]
 ;B[qh]
 ;W[ni]
 (;B[qj]
 ;W[id])
 (;B[id]C[Black is favorable])))
 (;W[pf]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[id]C[Joseki])
 (;W[qg]
 ;B[pf]
 ;W[of]
 ;B[og]C[Big fight]))
 (;B[oc]LB[nc:A][pd:B]C[If you know the follow-up, please email: kogo@waterfire.us.
 'a' is correct, 'b' is disadvantageous.]
 (;W[nc]LB[pc:B][nd:A]C['a' takes the top or a wall, 'b' the right side.]
 (;B[nd]LB[mc:C][pc:B][ne:A][oe:D]C['a' takes the right side, 'b' the corner. 'c' is disadvantageous. 'd' is nonsense.]
 (;W[ne]
 ;B[md]
 ;W[pc]
 ;B[ob]
 ;W[pd]
 ;B[pb]
 ;W[qb]
 ;B[qc]
 ;W[rb]
 ;B[mc]
 ;W[qe]LB[ng:A]C[Later Black 'a'.])
 (;W[pc]LB[ob:B][oe:A]C['a' is better than 'b'.
 'a' makes a wall, 'b' takes some territory.]
 (;B[oe]
 ;W[pd]
 ;B[pe]LB[ob:B][ne:C][qe:A]C['a', 'b' or 'c' give Black a wall for a large corner.
 White must have the ladder for 'c'.]
 (;W[qe]LB[ob:B][mc:A]C['a' makes a wall, 'b' takes the top side.]
 (;B[mc]
 ;W[ob]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd])
 (;B[ob]
 ;W[ne]
 ;B[md]
 ;W[of]
 ;B[pb]
 ;W[qc]
 ;B[qb]
 ;W[rc]))
 (;W[ob]
 ;B[md]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[pf]
 ;W[rd])
 (;W[ne]
 ;B[md]
 ;W[qe]
 ;B[qc]
 ;W[pb]
 ;B[qf]
 ;W[re]LB[pf:A][rf:B]C['a' makes a wall and gives a large corner.
 'b' starts the ladder.]
 (;B[pf]
 ;W[rf]
 ;B[qg]
 ;W[qb]
 ;B[nf])
 (;B[rf]
 ;W[pf]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[mg]
 ;B[nh]
 ;W[ni])))
 (;B[ob]LB[pb:B][pd:A]C['a' is correct, 'b' is very bad.]
 (;W[pd]LB[pb:A][mc:B]C['a' is better than 'b'.]
 (;B[pb]
 ;W[qb]
 ;B[qc]
 ;W[rb]
 ;B[mc]
 ;W[ne]
 ;B[md]
 ;W[qe])
 (;B[mc]
 ;W[nb]
 ;B[pb]
 ;W[ne]
 ;B[md]
 ;W[qb]
 ;B[mb]
 ;W[qc]))
 (;W[pb]
 ;B[pd]
 ;W[oe]
 ;B[nb]
 ;W[mc]
 ;B[qb]
 ;W[mb]
 ;B[qc]
 ;W[jc]
 ;B[ne]
 ;W[pe]
 ;B[lf]C[good for Black.])))
 (;W[mc]
 ;B[oe]
 ;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[qc]
 ;W[ob]
 ;B[pb]
 ;W[oc]
 ;B[md])
 (;W[oe]
 ;B[ob]))
 (;B[pc]
 ;W[nd]LB[pe:B][qf:A]C['a' or 'b'. Black needs the ladder for 'b'.]
 (;B[qf]
 ;W[ng]LB[id:B][qg:A]C['a' or 'b'.]
 (;B[qg]
 ;W[ph]
 ;B[qi]
 ;W[id])
 (;B[id]
 ;W[qg]))
 (;B[pe]
 ;W[pd]
 ;B[qc]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[pf]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[ng]
 ;B[se]
 ;W[nf]
 ;B[rd]
 ;W[hd])))
 (;W[pd]
 ;B[pc]
 ;W[qe]LB[qc:A][nd:B][re:C]C['a' punishes, 'b' and 'c' fail.]
 (;B[qc]
 ;W[nd]
 ;B[nc]TR[pg]C[Now the triangled stone is in a bad position.])
 (;B[nd]
 ;W[qc]
 ;B[rd]
 ;W[qb]
 ;B[re]
 ;W[qf]
 ;B[rc]
 ;W[rb]
 ;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[pa]
 ;B[ob]LB[sb:A][lc:B]C['a' is correct, 'b' is questionable.]
 (;W[sb]
 ;B[lc]
 ;W[rf]
 ;B[hd]
 ;W[qk])
 (;W[lc]
 ;B[md]
 ;W[lb]
 ;B[sb]
 ;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[lf]
 ;W[rf]
 ;B[pj]
 ;W[oi]))
 (;B[re]
 ;W[rd]
 ;B[qc]
 ;W[rf]
 ;B[nd]
 ;W[se]
 ;B[of]
 ;W[pf]))))
 (;W[qe]LB[pd:c][pe:b][re:a]C[There is a ladder here, which should be favorable for White to play this way.
 Black 'a' takes territory. Black 'a' is recommended for Black unless there are mitigating cirumstances. Black takes the right with 'a'.
 Black 'b' goes for influence, but Black may have problems if White has the ladder, as Black develops cutting points and potentially loses the corner.
 Black 'c' leads to the Magic Sword of Muramasa. With a favorable ladder, White can always get a good result. Black takes the right, White much of the corner and into the center.]
 (;B[re]LB[pe:a][qf:b]C[White draws back with 'a'. White 'b' is a mistake.]
 (;W[pe]LB[ld:3][qf:b][rf:a]C[
 Without Black 3, the position is a takamoku (5-4-point) joseki, where 'b' is the main variation to continue with.
 But with Black 3 in this variation, Black continues with 'a'.
 Black 'b' is not recommended, if White has the ladder (which White should have to have played this way).]
 (;B[rf]
 ;W[qc]LB[rc:A][rd:B]C['a' keeps White attackable. 'b' is an older joseki.
+]
 (;B[rc]
 ;W[pd]
 ;B[rd]
 (;W[ph]C[Old fashion]
 ;B[qb]
 ;W[id]
 ;B[lf]C[Black is low, but White has zero points.
 * Joseki *
 ])
 (;W[qb]
 ;B[qi]
 ;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[mb]
 ;B[jc]C[Modern joseki]))
 (;B[rd]LB[oc:a][pc:b][ph:c]C[Joseki continues at 'a'. The old joseki is at 'b', but White's shape has problems. 'c' is possible.]
 (;W[oc]C[White 10 was invented by Kubouchi Shuchi 9-dan.]
 ;B[pg]
 ;W[lb]C[
 * Joseki *])
 (;W[pc]
 ;B[pg]LB[mc:b][nf:a]C[White moves out with 'a', or blocks at 'b'. Neither are particularly good.]
 (;W[nf]LB[mc:a][nd:b]C[White's shape is thin. Black can spoil White's position with 'a' or 'b'. White 10 is too heavy.]
 ;B[qj])
 (;W[mc]
 ;B[lc]
 ;W[md]C[White becomes overconcentrated while making Black strong and with no compensation.]
 ;B[le]
 ;W[nf]C[White is overconcentrated, and has no compensation for letting Black build a wall at top.]))
 (;W[ph]
 ;B[pc]
 ;W[oc]
 ;B[pb]
 ;W[pd]
 ;B[qb]
 ;B[pg]C[Later, this Black attack is no big problem for White.]
 ;W[og]
 ;B[qg]
 ;W[oh]
 ;B[of]
 ;W[nf]
 ;B[ne]
 ;W[pf]
 ;B[oe]
 ;W[me]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[lc]
 ;B[mb]
 ;W[lb])))
 (;B[qf]LB[rd:a][rf:b]C[
 White plays 'a' and gets a favorable result with a favorable ladder to the bottom-left. Conversely, White must play 'b' if the ladder is unfavorable, and gets an unfavorable result.]
 (;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[qg])
 (;W[rf]C[Black must have the ladder for White to play this way.]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[qc]C[M16 is not effective now, so White has a favorable result.]
 ;B[pf]LB[ne:a][of:b]C[Black 13 is the vital point.
 White continues with 'a'. White 'b' is not recommended.]
 (;W[ne]C[White 14 makes correct shape in this position.]
 ;B[of]
 ;W[nc])
 (;W[of]C[White 14 lets Black build thickness, while Black 3 sits in the way of White developing a good position.]
 ;B[og]
 ;W[nf]
 ;B[ng]))))
 (;W[qf]C[White 6 lets Black make good use of the pincer stone.]
 ;B[pd]
 ;W[oe]
 ;B[rf]CR[of]LB[ph:b][qh:a]C[White continues with 'a' or 'b'. Black pushes through and cuts at the marked location regardless.
 The pincer at Black 3 is in perfect position to help in the ensuing fight.]
 (;W[qh]
 ;B[pe]
 ;W[pf]
 ;B[of])
 (;W[ph]
 ;B[pe]
 ;W[pf]
 ;B[of])))
 (;B[pe]C[Black 5 is a fierce move. Black may have problems if White has the ladder, as Black develops cutting points and potentially loses the corner.]
 ;W[pd]LB[oe:B][qf:A]C['a' is joseki, 'b'.]
 (;B[qf]LB[qc:b][re:a]C[White continues with 'a'. White 'b' is timid.]
 (;W[re]
 ;B[qc]
 ;W[rf]
 ;B[oe]LB[pb:a][nd:c][ne:b]C[White continuing with 'a', hastening to take the corner, is joseki.
 White 'b' next is a mistake.
 White 'c' is undeveloped as a variation, and not recommended.]
 (;W[pb]
 ;B[qb]
 ;W[pc]
 ;B[qg]LB[rd:A][rg:B]C['a' is joseki, 'b' is a mistake.]
 (;W[rd]
 ;B[ne]LB[ob:c][rb:b][rg:a]C[
 * Joseki *
 Black 'a' is sente (White responds at 'b'), but there is no hurry to play it. Black may choose 'c' if the top is desired later.]
 ;W[]C[White plays elsewhere.]
 ;B[ob]C[Black takes the top.]
 ;W[qa]
 ;B[nd]
 ;W[rb])
 (;W[rg]
 ;B[ne]LB[mc:A][qh:B]C['a' is necessary, 'b' leads to a big loss.]
 (;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[mb]
 ;B[jc]
 ;W[rd])
 (;W[qh]
 ;B[ob]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[pa]
 ;W[oc]
 ;B[nd])))
 (;W[ne]C[White 12 is a mistake.]
 ;B[pg]LB[md:c][nd:b][qg:d][rg:a]C['a' and 'b' are miai. White 'c' does little good. White 'd' results in a large loss.]
 (;W[rg]
 ;B[nd])
 (;W[nd]
 ;B[rg])
 (;W[md]
 ;B[rg]
 ;W[le])
 (;W[qg]C[White 14 is a mistake.]
 ;B[nd]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[ph]
 ;B[me]C[This result is terrible for White.]))
 (;W[nd]C[White 12 is an undeveloped variation.]
 ;B[ob]C[Black can live in the corner or connect to the pincer stone.
 The outside stones have aji.]))
 (;W[qc]C[White 8 is a mistake born of timidity.]
 ;B[re]
 ;W[rc]
 ;B[nc]C[White still lacks proper eye shape.]))
 (;B[oe]C[If you know the follow-up, please email: kogo@waterfire.us.]))
 (;B[pd]C[Black 5 begins the Magic Sword of Muramasa. White gets a good result with a favorable ladder.
 Black takes the right, White much of the corner and into the center.]
 ;W[pe]
 ;B[oe]LB[nd:b][rd:a]C[
 The Magic Sword of Muramasa
 ---------------------------------
 White should have the ladder to play this way.
 White continues with 'a' or 'b'. White 'a' is not as favorable, but avoids compliations. White must have the ladder to play 'b'.
+]
 (;W[rd]C[White 8 attempts to avoid complications.]
 ;B[rc]
 ;W[re]
 ;B[oc]
 ;W[nd]LB[nc:a][ne:b]C[Black continues at 'a' or 'b'. Black 'b' is a fighting move that puts White in trouble.]
 (;B[nc]LB[mc:a][ne:b]C[White continues at 'a'. White 'b' is a mistake.]
 (;W[mc]
 ;B[md]
 ;W[ne]
 ;B[qb]
 ;W[of]C[Black has a slightly better result.])
 (;W[ne]C[White 14 is a mistake.]
 ;B[of]
 ;W[mc]
 ;B[qb]C[White has been split in two; the ensuing fight favors Black.]))
 (;B[ne]C[Black 13 is a tough-minded move that gives White serious trouble.]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[qb]
 ;W[me]
 ;B[og]LB[md:a][qg:b]C[Black 19 makes miai of 'a' and 'b': White is in trouble.]))
 (;W[nd]LB[ne:b][re:a]C[White must have the ladder to play this way.
 Black continues with 'a' or 'b'.]
 (;B[re]
 ;W[rf]
 ;B[rd]
 ;W[of]
 ;B[qf]
 ;W[ne]
 ;B[qg])
 (;B[ne]C[Black 9 attempts mischief.]
 ;W[me]LB[mf:b][og:a]C[Black 'a' is correct. Black 'b' shows foolish fighting spirit.]
 (;B[og]
 ;W[md]C[White can afford to give up the two stones.]
 ;B[qg]
 ;W[pb]C[White 14 is a good forcing move.]
 ;B[re]
 ;W[id]LB[rc:b][mf:a]C[White 'a' is sente. White 'b' later is big.])
 (;B[mf]C[Black 11 is a mistake, though White must answer with care.]
 ;W[md]
 ;B[le]C[Black has too many cutting points.]
 ;W[lc]
 ;B[kc]
 ;W[mb]
 ;B[lb]
 ;W[mc]
 ;B[kb]
 ;W[pc]
 ;B[qc]
 ;W[pb]LB[qb:a][re:b]C[Black 'a' ends in grief. Black 'b' builds magnificant thickness while giving White a huge corner.]
 (;B[qb]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[nb]
 ;W[sc]LB[qa:b][sb:a]C[If Black 'a', White 'b' wins the fight.])
 (;B[re]
 ;W[rf]
 ;B[rd]LB[qb:b][qf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qf]LB[qb:b][og:a]C[Black continues at 'a'.
 Black 'b' doesn't work if White has the ladder.]
 (;B[og]
 ;W[qb]
 ;B[rb]
 ;W[sc]
 ;B[lf]C[White gets a better result.])
 (;B[qb]C[Black 27 is only possible if White does not have the ladder.
 Otherwise, Black 27 is a mistake.]
 ;W[nf]
 ;B[of]
 ;W[ng]
 ;B[og]
 ;W[oh]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[lf]LB[mg:a][qh:b]C[If White has the ladder, Black 'a' and 'b' are both bad, but Black is better off with 'a'.]
 (;B[qh]
 ;W[mg]
 ;B[pi]
 ;W[hd])
 (;B[mg]C[Black 37 is a mistake.]
 ;W[nh]
 ;B[lh]
 ;W[rg]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri]
 ;B[sh]C[Black lives in the corner, small consolation for a terrible result.])))
 (;W[qb]C[White 26 is a mistake.]
 ;B[qg]LB[qf:a][pg:b]C[White continues with 'a', possibly 'b'.]
 (;W[qf]
 ;B[rg]
 ;W[sf]
 ;B[og]
 ;W[sd]
 ;B[lf]C[White has a large corner, but Black has magnificant thickness.])
 (;W[pg]
 ;B[ph]
 ;W[nf]
 ;B[of]
 ;W[og]
 ;B[ng]
 ;W[pf]
 ;B[nf]
 ;W[oh]LB[lf:b][qh:a]C['a' and 'b' are miai.]
 (;B[qh]
 ;W[lf]
 ;B[nh]
 ;W[oi]C[Black is in a very uncomfortable situation.])
 (;B[lf]
 ;W[qh]
 ;B[pi]
 ;W[rh])))))))))
 (;W[pf]LB[oe:A][qf:B]C[White 4 is joseki, but very complicated.
 'a' is joseki, 'b' is questionable.]
 (;B[oe]
 ;W[pe]
 ;B[pd]LB[oc:B][nd:A][ne:C]C[White 'a' is joseki. 'b' is very complicated and disadvantageous for White. White 'c' is inferior.
+]
 (;W[nd]LB[of:B][og:A]C['a' or 'b'.]
 (;B[og]LB[lc:B][me:A][re:C]C['a', 'b' or 'c'.]
 (;W[me]
 ;B[of]
 ;W[re]LB[ob:A][rd:C][pg:B]C['a' is correct, 'b' was played between Yi Chang-ho and Chang Hao, but is not recommended.
 'c' is possible.]
 (;B[ob]
 ;W[rd]
 ;B[rc]
 ;W[qh]
 ;B[mc]
 ;W[le]
 ;B[ke]
 ;W[kf]
 ;B[je]
 ;W[lg]
 ;B[oi]
 ;W[qj])
 (;B[pg]
 ;W[rd]
 ;B[rc]
 ;W[rg]
 ;B[qg]
 ;W[rf]
 ;B[oc]
 ;W[nc]
 ;B[rh]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[qc]
 ;W[ri]
 ;B[qh]
 ;W[sh]
 ;B[pb]
 ;W[qj])
 (;B[rd]
 ;W[rg]
 ;B[pg]
 ;W[qg]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[nb]LB[qe:A][rj:B]C['a' is correct, 'a' is a mistake.]
 ;B[qe]
 ;W[qf]
 ;B[sf]LB[rf:A][rj:B]C[Black can live on 'a' or capture on 'b'.]))
 (;W[lc]
 ;B[of]
 ;W[kd]
 ;B[pg])
 (;W[re]
 ;B[rd]
 ;W[me]
 ;B[of]
 ;W[qh]
 ;B[ph]
 ;W[rg]
 ;B[mf]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[le]
 ;B[qi]
 ;W[ri]
 ;B[qg]
 ;W[rh]
 ;B[qf]
 ;W[qj]
 ;B[pi]
 ;W[kd]
 ;B[ql]
 ;W[pj]
 ;B[rk]
 ;W[rj]
 ;B[rf]
 ;W[pl]))
 (;B[of]LB[re:A][og:B]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[qe]
 ;W[qf]
 ;B[rd]
 ;W[rf]
 ;B[ob]
 ;W[me]
 ;B[oh]
 ;W[qi]
 ;B[pj])
 (;W[og]
 ;B[me])))
 (;W[oc]LB[ne:a][of:b]C[
 'a' is okay for punishment, 'b' is also possible.
+]
 (;B[ne]
 ;W[qb]LB[rb:B][rf:A]C['a' is correct. 'b' is a mistake.
+]
 (;B[rf]LB[rb:B][rc:B][qg:A]C['a' is ok, 'b' is a mistake.
+]
 (;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rg]
 ;W[qi]LB[qh:A][rh:B]C[Black plays 'a', because White 'b' would be sente.
+]
 ;B[qh]
 ;W[ph]
 ;B[rh]LB[lb:A][ri:B]C[White plays 'a', White 'b' is gote.
+]
 ;W[lb]
 ;B[jc]LB[jb:B][nb:A]C[White 'a' is necessary and very submissive, White 'b' is not good.
+]
 (;W[nb])
 (;W[jb]
 ;B[mb]LB[nb:B][mc:A]C[Punishment
 'a' or 'b' don't give a good result.
+]
 (;W[mc]
 ;B[lc]LB[kb:A][nb:B]C['a' or 'b'.
+]
 (;W[kb]
 ;B[nc]
 ;W[nb]
 ;B[md]
 ;W[ma]
 ;B[ic]C[Ko for White's second eye.
 ])
 (;W[nb]
 ;B[kb]LB[jb:22]C[Whtie 22 useless.
 ]))
 (;W[nb]
 ;B[mc]
 ;W[ma]
 ;B[ic]C[W not yet alive.
 ])))
 (;W[rc]
 ;B[rd]
 ;W[qg]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[rb]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[kc]
 ;W[lb]
 ;B[kb]C[W dead.
 ]))
 (;B[rb]
 ;W[qc]
 ;B[rc]
 ;W[qe]C[B dead.
 ]))
 (;B[of]
 ;W[pg]
 ;B[og]
 ;W[ph]
 ;B[oh]
 ;W[pi]
 ;B[nd]LB[nc:b][oi:a]C[White continues with 'a'. White 'b' doesn't work.]
 (;W[oi]
 ;B[nc])
 (;W[nc]
 ;B[mc]
 ;W[ne]
 ;B[md]
 ;W[qb]
 ;B[rb]LB[ra:a][pb:b]C[White sets up a losing ko with 'a', or dies with 'b'.]
 (;W[ra]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[pa])
 (;W[pb]
 ;B[rc]
 ;W[re]LB[ra:a][nb:b]C[Black continues with 'a', the vital point. Black 'b' is bad.]
 (;B[ra]C[Black 25 is the vital point.]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[la])
 (;B[nb]C[Black 25 is a mistake.]
 ;W[ob]
 ;B[mb]
 ;W[ra])))))
 (;W[ne]
 ;B[oc]
 ;W[of]
 ;B[nc]C[Black connects underneath and White cannot be proud of the result.
 White's shape is bad, as White 4 is not doing anything.]))
 (;B[qf]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[qj]
 ;W[id]))
 (;W[qc]C[White 4 is not joseki, as Black 3 is right where White would like to extend and Black is helped on the right.]
 ;B[rc]LB[rb:b][pc:a][qe:c]C[White continues with 'a'. White 'b', giving Black superior thickness to White's small life in the corner, is sometimes seen in amateur games. 'c' doesn't repair the White mistake either.]
 (;W[pc]
 ;B[re]LB[mc:b][of:a]C[The pincer at 3 is blocking White's natural extension.
 White continues with 'a' or 'b', neither particularly good.]
 (;W[of]
 ;B[pg]LB[pc:6][qc:4][of:8][pg:9]C[If White omits 4 and 6 and jumps to 8 directly, Black cannot go to 9, so White now has helped Black.])
 (;W[mc]
 ;B[lc]))
 (;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[qf])
 (;W[qe]
 ;B[pd]C[Only this move is the correct punishment.]
 ;W[pe]
 ;B[pc]LB[oc:B][re:A]C['a', 'b' don't give White a good result.]
 (;W[re]
 ;B[oe])
 (;W[oc]
 ;B[re]LB[nf:A][qg:B]C['a' or 'b' don't give a good result.]
 (;W[nf]
 ;B[qg])
 (;W[qg]
 ;B[oe]))))
 (;W[]C[White plays elsewhere.]
 ;B[pf]LB[qc:a][ne:e][of:c][pg:d][cq:b]C[White may try 'a' as a preliminary to jumping to the center.
 Var 2 ('b') covers White playing elsewhere again.
 White cannot play c', provoking Black 'd', but White 'e' creates a cumbersome shape, so White lacks a good move into the center.
 This is the reason for not playing elsewhere.]
 (;W[qc]
 ;B[rc]LB[pc:c][rd:a][qe:b]C[White continues with 'a', settling himself lightly, or 'b'.
 White may play 'c' as a prelude to moving out in the center, but this is not recommended.
+]
 (;W[rd]LB[pd:A][re:B]C['a' is correct, 'b' is questionable.
+]
 (;B[pd]LB[rb:B][pc:A]C['a' or 'b' are ok.
+]
 (;W[pc]LB[rb:B][oc:C][re:A]C['a' or 'b' are ok. 'c' is questionable.
+]
 (;B[re]
 ;W[rb]
 ;B[sd]
 ;W[nc]
 ;B[ne])
 (;B[rb]
 ;W[re]
 ;B[qf]
 ;W[nc]
 ;B[rf]
 ;W[qb]
 ;B[ne])
 (;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[re]
 ;B[qf]
 ;W[rb]))
 (;W[rb]
 ;B[pc]
 ;W[sc]
 ;B[qb]
 ;W[rc]
 ;B[re]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[oc]))
 (;B[re]C[Black aims to keep the right side territory instead of making strength towards the center, this is too defensive a way of playing.
+]
 ;W[pd]LB[sd:a][qe:b]C[Black plays 'a' to prevent White settling in the corner, or 'b'
 to connect to Black 5.]
 (;B[sd]
 ;W[qe]
 ;B[rd]
 ;W[of]LB[og:B][pg:A]C['a' is correct, 'b' questionable.]
 (;B[pg])
 (;B[og]
 ;W[qf]))
 (;B[qe]C[Black 10 connects, but White can settle in the corner.]
 ;W[rb]
 ;B[sd]
 ;W[pb])))
 (;W[qe]LB[pd:A][pe:B][re:C]C['a' pushes White to the right side, 'b' into the corner. 'c' is a mistake.
+]
 (;B[pd]
 ;W[pe]
 ;B[oe]
 ;W[rd]
 ;B[pc]
 ;W[re]
 ;B[qb]
 ;W[of]
 ;B[ne]
 ;W[pg])
 (;B[pe]
 ;W[rd]
 ;B[pd]
 ;W[rb]
 ;B[pc]
 ;W[sc])
 (;B[re]
 ;W[pd]
 ;B[rd]
 ;W[of]))
 (;W[pc]C[White 7 is not recommended.]
 ;B[rb]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[le]
 ;W[nf]C[Black gets nice shape on the right and a wall at top. White is still not settled.]))
 (;W[]C[White plays elsewhere again.]
 ;B[ne]
 ;W[qc]C[White can still make a small life in the corner.]
 ;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc]))
 (;W[pd]LB[qc:b][qe:a]C[White 4 is not recommended.
 Black continues with 'a'. Black 'b' is a mistake in direction.]
 (;B[qe]
 ;W[qc]
 ;B[rc]LB[qb:b][rb:a]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[rb]C[White 8 is a sacrifice tesuji.]
 ;B[qb]
 ;W[pc]
 ;B[ra]
 ;W[pf]C[White 12 creates aji to play below Black 7.]
 ;B[sb]C[Black eliminates the aji from White 12.])
 (;W[qb]C[White 8 is not bad, it is just not as good as the nidan-bane (2-step hane) of White 8 onto the marked point.]MA[rb]
 ;B[qh]))
 (;B[qc]C[Black gets a small corner while giving White superior thickness.]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg]))
 (;W[og]
 (;B[qf]
 ;W[ph]LB[of:A]C[Later, Black can attack on 'a'.])
 (;B[qg]C[Joseki too]))
 (;W[ph]LB[oe:A][pf:C][qf:B]C[Favorite plan of Kudo Norio, 9D. 'a' or 'b' here. May also consider 'c' and tenuki.]
 (;B[oe]
 ;W[ne]
 ;B[of]
 ;W[pd]
 ;B[qf]
 ;W[qc]
 ;B[qe]
 ;W[nc]
 ;B[rc]
 ;W[qb])
 (;B[qf]
 ;W[pf]
 ;B[pg]
 ;W[qg]
 ;B[og]
 ;W[of]
 ;B[qh]
 ;W[rg]
 ;B[rf]
 ;W[rh]
 ;B[nf]
 ;W[qc]
 ;B[qi]
 ;W[ri]
 ;B[pd]
 ;W[ne]
 ;B[ng]
 ;W[pc]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[me]
 ;W[qj]
 ;B[pe])
 (;B[id]
 ;W[pf]C[Black can still live in the corner]))
 (;W[oh]C[Rare])
 (;W[mf]C[Rare plan])
 (;W[le]C[Rare idea])
 (;W[qf]
 ;B[pe]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[qe]C[Yoda Norimoto once used R14 in his game vs Kajiwara.
 Black has bad shape, but he is fine.]))
 (;B[kd]LB[qe:C][of:A][pf:B][pg:D]C[
 -Space High Pincer = Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia
 -----------------------------------------------------------------------------
 The purpose of the three-space high pincer is to maintain overall balance. This pincer is still experimental. Definitive joseki have yet to emerge.
 'a' is simple and correct. 'b', 'c' or 'd' are possible.
 'a' is too soft. 'b' is best.]
 (;W[of]
 ;B[qf]
 ;W[oh]
 ;B[qh]
 ;W[id]
 ;B[kf]LB[if:B][kh:A]TR[dd]C[It's likely that White is also on the triangled point. Then, 'a' is correct, 'b' wrong.
+]
 ;AW[dd]LB[if:B][kh:A]
 (;W[kh]
 ;B[jg]
 ;W[jh]LB[ig:A][ih:B]C['a' is correct, 'b' is an overplay.
+]
 (;B[ig]
 ;W[fd]
 ;B[ih]LB[ii:A][jj:B]C['a' is correct, 'b' is too shy.
+]
 (;W[ii]
 ;B[hi]LB[hh:B][ij:A]C['a' is correct, 'b' is an overplay.
+]
 (;W[ij]
 ;B[hj]
 ;W[ik])
 (;W[hh]
 ;B[he]LB[hd:B][gh:A]C['a' or 'b' don't give White a good result.
+]
 (;W[gh]
 ;B[hd]
 ;W[ij]LB[mh:A]C[Black sente. White still has a weakness around 'a'.
 ])
 (;W[hd]
 ;B[gh]
 ;W[hg]
 ;B[gg]
 ;W[hf]
 ;B[gf]
 ;W[if]
 ;B[ie])))
 (;W[jj]))
 (;B[ih]
 ;W[ig]))
 (;W[if]
 ;B[kh]))
 (;W[pf]LB[oc:b][oe:c][qf:a]C[Black continues with 'a'. Black 'b' is not recommended, as the pincer stone loses its effectiveness.
 Black 'c' provokes a large scale fight.]
 (;B[qf]LB[pg:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[pg]C[If White does not have the ladder, he plays 6.]
 ;B[qg]
 ;W[ph])
 (;W[qg]C[If White has the ladder, he can play 6 here.]
 ;B[pg]
 ;W[qe]
 ;B[rf]
 ;W[of]
 ;B[re]
 ;W[ph]))
 (;B[oc]
 ;W[pd]
 ;B[pc]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[qe]
 ;B[rd]
 ;W[nc]
 ;B[pb]
 ;W[ob]
 ;B[qa]
 ;W[md])
 (;B[oe]C[Black 'c' was played by Kato Masao against Sakata Eio in the 30th Honinbo league playoff in 1975.]
 ;W[pe]
 ;B[pd]
 ;W[oc]
 ;B[ne]
 ;W[qb]
 ;B[rf]
 ;W[qg]
 ;B[rb]
 ;W[pb]
 ;B[rg]
 ;W[qi]
 ;B[rh]
 ;W[mc]
 ;B[qh]
 ;W[ph]
 ;B[pi]
 ;W[oh]
 ;B[pj]
 ;W[le]
 ;B[ng]))
 (;W[qe]
 ;B[re]
 ;W[pe]LB[qf:A][rf:B]C['a' or 'b'.
+]
 (;B[qf]LB[rd:B][pf:C][rf:A]C['a' is correct, 'b' involves a ladder.
 'c' is bad.]
 (;W[rf]
 ;B[rg]
 ;W[rd]
 ;B[sf]
 ;W[qc])
 (;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[qg])
 (;W[pf]
 ;B[qg]
 ;W[rf]
 ;B[rd]
 ;W[qh]
 ;B[pg]
 ;W[rg]
 ;B[ph]
 ;W[qi]
 ;B[oc]
 ;W[nc]
 ;B[pc]
 ;W[nd]
 ;B[pi]
 ;W[qj]
 ;B[lf]))
 (;B[rf]
 ;W[qc]
 ;B[rc]
 ;W[pd]
 ;B[rd]
 ;W[ph]
 ;B[qb]
 ;W[hd]))
 (;W[pg]
 ;B[oe]
 ;W[ne]
 (;B[of]LB[pd:A][nf:B]C['a' or 'b'.]
 (;W[pd]
 ;B[qf]
 ;W[qc]
 ;B[qe]
 ;W[nf]
 ;B[og]
 ;W[rc])
 (;W[nf]
 ;B[og]
 ;W[pd]
 ;B[qf]
 ;W[qc]
 ;B[rd]
 ;W[rc]))
 (;B[pe]C[A good plan now.]
 (;W[nf]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[oc]
 ;W[le]LB[ld:A]C[Black's corner is huge and the position of the marked stone is much better, comparing to the normal position at A.])
 (;W[ld]C[Most active way for White, but it's rather complicated.]))))
 (;B[pc]LB[oc:a][pe:d][qe:f][pf:e][og:c][pg:b]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
 Black 3 was an innovation by Kitani Minoru. The idea is to take sente at slight disadvantage locally.
 White continues with 'a' to emphasize the top.
 To emphasize the right side he can use 'f' with the ladder or 'b' without it.
 'c' and 'd go for influence.
 'e' is possible.
 'f' is a mistake.
+]
 (;W[oc]
 ;B[pe]LB[jc:b][kc:a]C[White continues with 'a' or 'b'.]
 ;W[kc])
 (;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[pf]
 ;W[og])
 (;AB[kc]
 ;W[og]
 ;B[pe]
 ;W[nf]
 ;B[qg]
 ;W[kf])
 (;W[pe]
 ;B[qe]
 ;W[pg]
 ;B[qf]
 ;W[mg]
 ;B[qh])
 (;W[pf]LB[pe:A][qf:B]C['a' appears in the Chinese Fuseki.
 'b' is also possible,
+]
 (;AW[dp][pp]AB[kc][dd]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[qf]
 ;B[qe])
 (;B[qf]
 ;W[qg]
 ;B[pg]
 ;W[qe]
 ;B[rf]
 ;W[of]LB[re:A][qh:B]C['a' is ok, 'b' is questionable.]
 (;B[re]
 ;W[ph])
 (;B[qh]
 ;W[re]
 ;B[rg]
 ;W[oc]
 ;B[rd]
 ;W[se]
 ;B[pb]
 ;W[ob]
 ;B[rb]
 ;W[kd])))
 (;W[qe]LB[oc:A][pe:C][re:B]C['a' and 'b' correct, 'c' gives an equal result instead of punishment.]
 (;B[oc]
 ;W[nd]
 ;B[mc]LB[re:A][qj:B]C[To get an equal position, White wants to play at 'a' and 'b' at the same time.]
 (;W[re]
 ;B[pj])
 (;W[qj]
 ;B[qf]C[One possible continuation.]
 ;W[re]
 ;B[of]
 ;W[pe]
 ;B[oh]))
 (;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[oc]
 ;W[md]
 ;B[nd]
 ;W[ne]
 ;B[nc]
 ;W[mf]
 ;B[rg]
 ;W[qi]
 ;B[lc]C[White's influence doesn't equal Black's territory.])
 (;B[pe]
 ;W[pd]LB[qc:B][re:C][qf:A]C['a' is correct, 'b' and 'c' are questionable.]
 (;B[qf]LB[qc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;W[qc]
 ;B[re]
 ;W[rd]
 ;B[qe]LB[pb:B][qb:A]C['a' or 'b'.]
 (;W[qb]
 ;B[pj]
 ;W[kc]LB[mc:A][nf:B]C[Later, Black play 'a' or 'b'.]
 (;B[mc]
 ;W[oc])
 (;B[nf]LB[md:A][dp:B]C['a' is correct, tenuki 'b' is not recommended.]
 (;W[md])
 (;W[dp]
 ;B[nd]LB[oc:A][oe:B]C['a' is less bad than 'b'.]
 (;W[oc]
 ;B[nc])
 (;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[ne]))))
 (;W[pb]
 ;B[rc]
 ;W[oc]
 ;B[pj]
 ;W[kd]))
 (;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qc]
 ;W[oe]
 ;B[pf]
 ;W[oc]
 ;B[rc]))
 (;B[qc]LB[pf:A][qf:B]C['a' with the ladder, 'b' without.]
 (;W[pf]
 ;B[re]
 ;W[oe]
 ;B[rf])
 (;W[qf]
 ;B[nc]LB[nd:A][of:B]C['a' or 'b'.]
 (;W[nd]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[oc]
 ;B[ob]
 ;W[of]
 ;B[nb]
 ;W[pj])
 (;W[of]
 ;B[nd]
 ;W[ne]
 ;B[ld])))
 (;B[re]
 ;W[qf]
 ;B[rc]
 ;W[oc]
 ;B[pb]
 ;W[of]))))
 (;B[pd]LB[oc:b][oe:a]C[
 Tsuke-Atari = Headbanging
 ----------------------------
 The thrust was an invention of Kitani Minoru and was one of his favorite moves. 'a' and 'b' are miai.
+]
 (;W[oe]
 ;B[oc]
 ;W[nc]LB[ob:a][pb:b]C[Black continues with 'a'. Black 'b' was the first professional experiment with this joseki.]
 (;B[ob]
 ;W[nb]
 ;B[pf]
 ;W[jc])
 (;B[pb]C[Kitani played Black 7 against Go Seigen in game 9 of their 1941 Jubango in Kamakura. The colors are reversed from actual play.
 The aim of Black 7 is to make White lose sente with succeeding plays 8 & 10.]
 ;W[ob]
 ;B[pc]
 ;W[md]
 ;B[ic]C[Black gets the good extension.]
 ;W[pf]C[White 12 is the only move.]))
 (;W[oc]
 ;B[oe]
 ;W[ne]
 ;B[of]LB[kc:b][md:a]C[White continues with 'a' or 'b'.]
 (;W[md])
 (;W[kc]LB[ld:a]C[White can play 8 here, but the possibility of Black 'a' is distasteful.])))
 (;B[pe]LB[kc:b][qc:a]C[Black 3 is unusual, not joseki.
 Played by Fujisawa Shuko, 9P, in Kisei titlematch.
 White continues with 'a'. White 'b' is premature.]
 (;W[qc]LB[pc:b][rc:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rc]
 ;W[pc]
 ;B[re]
 ;W[lc])
 (;B[pc]
 ;W[pd]
 ;B[qb]
 ;W[qe]
 ;B[rc]
 ;W[rd]
 ;B[qc]
 ;W[pf]C[Fujisawa (Black) vs Cho Chikun, played in Chinese fuseki.]))
 (;W[kc]C[White 4 is a nice extension, but premature.]
 ;B[oe]
 ;W[nd]
 ;B[pc]))
 (;B[]C[
 Tenuki
 -------
 This variation is covered as Takamoku-Komoku.
 ])
 (;B[pg]C[Rare joseki. Favorite pattern of Oleg Mezhov, 6D (Moscow).]
 (;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[re]
 ;W[kc]C[Result is equal])
 (;W[jc]LB[qe:A][qf:B]C[White can extend directly and use weakpoint at 'a' or 'b' later])))
 (;W[]LB[nc:C][oc:A][nd:D][od:B]C[
 Tenuki
 -------
 White plays elsewhere.
 'a' to 'd' are four possible shimari based on komoku.
+]
 (;B[oc]LB[rd:I][pj:H][qj:G][qk:F][ql:E]C[
 Keima Shimari
 ----------------
 The attack against this shimari depends on its context. Different
 situations have to be treated differently:
 . Black has extensions on both sides.
 . Black has an extension on the right, White is on top.
 . White is near on the right, Black can be on top.
 . White is strong on top and right.
 . Very early in the game (usually with move nr. 6), White invades the right side on 'e', 'f', 'g' or 'h'.
 'g' also covers White being far on the right.
 'i' shows, how an early White invasion can be pushed out especially if the middle of the right side is empty or White.
+]
 (;AB[jd][pj]LB[pc:D][nd:B][oe:A][pe:C][qe:E]C['a' and 'b' are joseki to reduce Black.
 'b' is directed against a Black moyo on top.
 'c' is more risky.
 'd' makes sabaki on top or a ko.
 'e' is wrong.
+]
 (;W[oe]LB[mc:G][pc:E][md:H][nd:B][od:D][ne:F][pe:C][pf:A]C['a', 'b', 'c' are joseki.
 'd' secures territory.
 'e' gives White no help to make shape.
 'F' is not recommended.
 'G' is anxious.
 'H' leaves aji of cutting.
+]
 (;B[pf]LB[nc:A][qc:E][md:C][le:B][ng:D]C['a' is joseki, but White needs the ladder,
 'b' is played by pros to avoid the ladder problem.
 'c' and 'd' are too mild.
 'e' is aji for a ko after tenuki.
+]
 (;W[nc]LB[nb:A][pc:C][nd:B][od:D]C[Black continues with 'a' or 'b'. 'b' punishes if White doesn't have the ladder.
 'c' is joseki, too.
 'd' helps White.
+]
 (;B[nb]
 ;W[ob]LB[pb:A][mc:B][nd:C][od:D]C[Black continues with 'a' to 'c'.
 'b' depends on the ladder.
 In 'c', Black yields the corner in return for thickness.]
 (;B[pb]LB[pc:B][od:A]C['a' is joseki and gote. 'b' tries to force another joseki which is sente.]
 (;W[od]LB[oa:B][pc:A]C['a' or 'b' are joseki.]
 (;B[pc]
 ;W[mb]
 ;B[oa]LB[md:A][le:B]C['a' or 'b' are correct.]
 (;W[md])
 (;W[le]
 ;B[mc]C[Later, this move is not recommended.]
 ;W[lc]
 ;B[nd]
 ;W[ne]
 ;B[lb]
 ;W[kc]))
 (;B[oa]
 ;W[pc]LB[ob:A][mc:B]C['a' shares, 'b' starts an all-or-nothing ko fight.]
 (;B[ob]
 ;W[ng]
 ;W[mc]LB[qc:B][pd:A][qe:C]C[Later sente.
 Black must play 'a' or White plays 'b' or 'c'.
+]
 (;B[pd])
 (;W[qc]
 ;B[pd]LB[qb:C][rb:A][rc:D][pe:B]C['a' is the correct tesuji for continuations on the top side.
 'b' goes for the right side.
 'c' and 'd' are mistakes.
+]
 (;W[rb]LB[qb:A][rc:B]C['a' saves the corner and is correct. 'b' leads to ko.
+]
 (;B[qb]
 ;W[rc]
 ;B[rd]LB[mb:A][kc:B]C['a' threatens to capture, 'b' to go down in sente.
+]
 (;W[mb]LB[qa:A][jb:B]C['a' saves the corner, 'b' doesn't.
+]
 (;B[qa])
 (;B[jb]
 ;W[qa]))
 (;W[kc]LB[ra:A][jc:B]C['a' or 'b' give White continuations on the top side.
+]
 (;B[ra])
 (;B[jc]
 ;W[qa]
 ;B[sc]
 ;W[ra]
 ;B[sb]
 ;W[mb]
 ;B[sd]
 ;W[ma]
 ;B[sa])))
 (;B[rc]
 ;W[qb]
 ;B[rd]
 ;W[mb]
 ;B[sb]
 ;W[qa]
 ;B[ra]
 ;W[sa]))
 (;W[pe]
 ;B[qe]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[rd]
 ;W[qf])
 (;W[qb]
 ;B[rb])
 (;W[rc]
 ;B[rb]))
 (;W[qe]
 ;B[pe]
 ;W[pd]))
 (;B[mc]
 ;W[ob])))
 (;W[pc]LB[oa:A][od:B]C['a' is joseki, 'b' is slightly disadvantageous.]
 (;B[oa]
 ;W[od])
 (;B[od]
 ;W[pd]
 ;B[nd]
 ;W[pe]LB[qb:B][ne:A]C[White has continuations on 'a' or 'b'.])))
 (;B[mc]LB[pc:B][nd:A]C['a' with a White ladder, 'b' with a Black ladder.]
 (;W[nd]
 ;B[pb]LB[pd:B][pi:A]TR[pj]C[If the triangled stone is one line lower, White can try to make himself independent of the ladder with 'a'.
 With 'b', he needs the ladder.]
 (;AE[pj]AB[qj]
 ;W[pi]
 ;B[of]LB[nf:A][qi:B]C[White continues with 'a'. Depending on circumstances, White can put pressure on Black 5 and build a wall next to Black 7 with 'b'.]
 (;W[nf]
 ;B[oh]
 ;W[mb]
 ;B[oa]
 ;W[lc]
 ;B[md]
 ;W[le])
 (;W[qi]
 ;B[nf]
 ;W[mb]
 ;B[oa]
 ;W[lc]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[kd]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[kc]))
 (;W[pd]
 ;B[pc]
 ;W[mb]
 ;B[oa]
 ;W[lc]LB[qe:A]C[Aji on 'a'.]))
 (;W[pc]
 ;B[nd]
 ;W[od]LB[nb:7][ob:8][pc:10][nd:11][od:12]C[Same variation as Black 11 before 7 and White 12 before 8 and 10.]))
 (;B[nd]
 ;W[mc]
 ;B[od]LB[pb:A][md:B]C[White continues with 'a' or 'b'.]
 (;W[pb]
 ;B[lc]
 ;W[mb]LB[md:A]C[Black 18 at 'a' is unreasonable; White loses his base.]
 ;B[md]
 ;W[lb]
 ;B[kc])
 (;W[md]
 ;B[pb]
 ;W[me]))
 (;B[od]LB[mb:B][pb:A]C['a' is correct, 'b' is what Black wants.]
 (;W[pb]
 ;B[mb]
 ;W[qc]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[rg])
 (;W[mb]
 ;B[nd]
 ;W[mc]
 ;B[pb])))
 (;B[nd]
 ;W[od]LB[mc:A][pc:B]C[Black continues with 'a' or 'b'. 'b' punishes if White doesn't have the ladder.
+]
 (;B[mc]LB[nb:A][pc:B]C['a' is ok, 'b' is questionable.
+]
 (;W[nb]
 ;B[pc]
 ;W[md]
 ;B[ne]
 ;W[le]
 ;B[of]
 ;W[lc])
 (;W[pc]
 ;B[nb]
 ;W[ob]
 ;B[nc]LB[pd:B][qe:A]C['a' is slighlty better than 'b'.
+]
 (;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[re]
 ;W[qc]
 ;B[rd]
 ;W[ne])
 (;W[pd]
 ;B[qe]LB[qc:C][ne:B][of:A]C[White flees with 'a' or 'b'.
 'c' takes away corner options for later.]
 (;W[of])
 (;W[ne])
 (;W[qc]LB[rc:B][rd:A][ng:C]C['a' or 'b' drive White out. 'c' encloses a living White corner.]
 (;B[rd]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[pa]
 ;B[ra])
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[pb]
 ;B[sb]
 ;W[qa]
 ;B[oa])
 (;B[ng]LB[pb:C][qb:B][rb:A]C[White lives on 'a', makes a ko with 'b' and dies on 'c'.]
 (;W[rb]LB[pb:A][rd:B]C['a' or 'b' don't kill.]
 (;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rd]
 ;B[re]
 ;W[sc])
 (;B[rd]
 ;W[qa]
 ;B[pb]
 ;W[oa]
 ;B[sb]
 ;W[sc]
 ;B[rc]
 ;W[sa]
 ;B[sd]
 ;W[sb]))
 (;W[qb]LB[oa:B][pa:C][rd:A]C['a', 'b' and 'c' force the ko.]
 (;B[rd]LB[pa:A][rc:B]C['a' is correct. 'b' leads to ko.]
 (;W[pa]
 ;B[rb]
 ;W[rc]
 ;B[sc]
 ;W[sb]
 ;B[sa]
 ;W[ra]
 ;B[qa])
 (;W[rc]
 ;B[oa]
 ;W[pa]LB[na:A][ra:B]C['a' or 'b' leads to ko.]
 (;B[na]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pb])
 (;B[ra]
 ;W[na]
 ;B[ma]
 ;W[qa]
 ;B[oa])))
 (;B[oa]
 ;W[rd]
 ;B[re]
 ;W[sc]LB[rb:A][se:B]C['a' is correct. 'b' is a mistake.]
 (;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[pa]
 ;B[pb])
 (;B[se]
 ;W[ra]
 ;B[pb]
 ;W[sb]))
 (;B[pa]
 ;W[oa]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[rd]
 ;B[sd]
 ;W[sc]))
 (;W[pb]
 ;B[rb]
 ;W[rc]
 ;B[rd]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[oa]))))))
 (;B[pc]
 ;W[md]))
 (;B[pc]LB[lc:C][nd:B][me:A]TR[jd]C['a' is joseki, 'b' is heavy.
 'c' is correct, if the triangled stone is one line lower.]
 (;W[me])
 (;W[nd])
 (;AE[jd]AB[jc]
 ;W[lc]))
 (;B[od]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[ob]
 ;B[pb]
 ;W[nb]LB[qb:A]C[White has a good position and an endgame move on 'a'.]))
 (;W[le]LB[nc:A][qc:B]C[Later, White continues on 'a' or 'b'.
+]
 (;W[nc]C[Later, White's move is independent of the ladder.
+]
 ;B[nb]
 ;W[ob]
 ;B[pb]
 ;W[od]
 ;B[pc]
 ;W[mb]
 ;B[oa])
 (;W[qc]LB[le:6]C[See this move without White 6 for continuations.
 ]))
 (;W[md])
 (;W[ng])
 (;W[qc]LB[pd:A][rd:B]C['a' results in ko. With 'b', White lives.]
 (;B[pd]
 ;W[rd]
 ;B[re]LB[rb:A][rc:B]C['a' results in ko. With 'b', White dies.]
 (;W[rb]
 ;B[pb]
 ;W[qb]LB[sc:B][sd:A]C['a' results in ko. With 'b', White lives or pushes out.]
 (;B[sd]
 ;W[sc]
 ;B[se]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[rc]
 ;W[pc]LB[ob:A][sb:B]C[If 'a', ko. If 'b', White lives.]
 (;B[ob]
 ;W[rd]
 ;B[qg]
 ;W[rf]
 ;B[rc])
 (;B[sb]
 ;W[ob]
 ;B[nb]
 ;W[pa]
 ;B[nc]
 ;W[ra]))
 (;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[ra]LB[sb:B][qe:A]C['a' makes influence in sente, 'b' fails to kill.]
 (;B[qe]
 ;W[sb]
 ;B[se]
 ;W[rc])
 (;B[sb]
 ;W[pc]
 ;B[ob]
 ;W[qe]LB[pe:A][qf:B]C['a' or 'b'.]
 (;B[pe]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[sg]
 ;W[sf]
 ;B[pg])
 (;B[qf]
 ;W[pe]LB[od:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[od])
 (;B[od]
 ;W[rf])))))
 (;W[rc]LB[ob:A][pb:C][qe:B]C['a' kills, 'b' and 'c' fail.]
 (;B[ob]LB[qe:A][rf:B]C['a' or 'b' fail.]
 (;W[qe]
 ;B[qf]
 ;W[pe]
 ;B[rf]
 ;W[pb])
 (;W[rf]
 ;B[se]
 ;W[qe]
 ;B[qf]
 ;W[pe]
 ;B[rg]
 ;W[sd]
 ;B[sf]
 ;W[pc]
 ;B[od]))
 (;B[qe]
 ;W[pb]
 ;B[ob]
 ;W[ra])
 (;B[pb]
 ;W[qe]LB[pe:B][qf:A]C[Black cannot kill on 'a' or 'b'.]
 (;B[qf]
 ;W[pe]
 ;B[rf]
 ;W[nb]LB[ob:B][nc:A]C[Black cannot kill on 'a' or 'b'.]
 (;B[nc]
 ;W[pc]
 ;B[od]
 ;W[ob])
 (;B[ob]
 ;W[od]
 ;B[pc]
 ;W[nc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[oa]
 ;B[sd]
 ;W[qa]
 ;B[pa]
 ;W[qa]))
 (;B[pe]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[sg]
 ;W[sf]
 ;B[pg]))))
 (;B[rd]
 ;W[pc]
 ;B[pd]
 ;W[ob]
 ;B[nc]LB[nb:A][rb:B]C['a' leads to life, 'b' to ko.]
 (;W[nb]
 ;B[mc]
 ;W[rb]
 ;B[mb]
 ;W[pa]
 ;B[na]
 ;W[qb])
 (;W[rb]
 ;B[nb]
 ;W[pa]
 ;B[sb]
 ;W[qb]
 ;B[ra]
 ;W[sc]
 ;B[rc]
 ;W[sa]))))
 (;B[nd]LB[pd:A][rd:C][qe:B]TR[pj]C['a' is joseki.
 'b' may be possible, but gives heavy shape if the triangled stone is one line lower.
 'c' is tricky.]
 (;W[pd]LB[pc:A][qc:B]C['a' is joseki, 'b' is bad in this position, but correct with more Black stones.
+]
 (;B[pc]
 ;W[qe]
 ;B[rd]LB[oh:B][qh:A]TR[pj]C['a' or 'b'.
 If the triangled stone is one line lower, there are some other moves.]
 (;W[qh])
 (;W[oh])
 (;AE[pj]AB[qj]LB[mf:C][qh:D][pi:B][oj:A]C['a', 'b' or 'c', 'd' is bad.]
 (;W[oj])
 (;W[pi])
 (;W[mf]LB[ne:B][pf:C][pg:A]C['a' is correct, 'b' and 'c' are bad.]
 (;B[pg]LB[ne:A][og:B]C['a' is correct, 'b' strengthens Black on the wrong side.]
 (;W[ne]
 ;B[md])
 (;W[og]
 ;B[oh]))
 (;B[ne]
 ;W[nf]
 ;B[of]
 ;W[og]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[oj])
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[og]))
 (;W[qh])))
 (;B[qc]LB[qe:A]C[White punishes on 'a'. The second variaton covers Black being stronger.
+]
 (;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qh]LB[pc:A]C[White aji on 'a'.])
 (;AE[jd][pj]AB[jc][je][qh]
 ;W[oh]TR[qd][qh]C[White cannot cut between the two marked stones.
 ])))
 (;W[qe]
 ;B[pd]
 ;W[pe]LB[pg:B][qg:A]TR[pj]C['a' is correct, 'b' is correct, if the triangled stone is one line lower.]
 (;B[qg]
 ;W[pg]
 ;B[ph]LB[oh:A][dp:B]
 (;W[oh]LB[og:B][qh:A]C[Black continues with 'a' or 'b'. Regardless, White makes good.]
 (;B[qh]
 ;W[ng]C[White's invasion is a success.])
 (;B[og]
 ;W[ng]
 ;B[pf]
 ;W[of]
 ;B[pg]
 ;W[mf]C[If anything, White's position is stronger than Black's on the right.]))
 (;W[dp]
 ;B[qh]))
 (;AE[pj]AB[qj]LB[pg:A][qg:B]C['a' is correct. 'b' is a mistake.]
 (;B[pg])
 (;B[qg]
 ;W[pg]
 ;B[ph]LB[oh:A][dp:B]C['a' is correct, temuki 'b' is not recommended.]
 (;W[oh]LB[og:B][qh:A]C['a' or 'b'.]
 (;B[qh]
 ;W[ng])
 (;B[og]
 ;W[ng]
 ;B[pf]
 ;W[of]
 ;B[pg]
 ;W[mf]))
 (;W[dp]LB[qh:B][pi:A]C['a' or 'b'.]
 (;B[pi])
 (;B[qh])))))
 (;W[rd]LB[rc:A][pd:C][qe:D][re:B]C[Black continues with 'a' to 'd'. Black 'c' attempts to give White a hard time in making shape. Black 'd' yields the corner for thickness.]
 (;B[rc]LB[qc:B][pd:A]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[qe]
 ;W[pc]
 ;B[qc]
 ;W[ob]
 ;B[nb]
 ;W[qb]
 ;B[ne]
 ;W[of]
 ;B[pg])
 (;W[qc]
 ;B[qb]
 ;W[qe]
 ;B[pd]
 ;W[sc]
 ;B[rb]
 ;W[rf]))
 (;B[re]
 ;W[qe]
 ;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd]
 ;W[qg])
 (;B[pd]
 ;W[qg]
 ;B[re]
 ;W[rf]
 ;B[qe]
 ;W[og])
 (;B[qe]LB[qc:A][re:B]C['a' or 'b'.]
 (;W[qc]
 ;B[re]
 ;W[pc]
 ;B[pd]
 ;W[rb]
 ;B[od])
 (;W[re]LB[rc:B][qf:A]C['a' is correct, 'b' is questionable.]
 (;B[qf]
 ;W[qc]
 ;B[pc]
 ;W[qb]
 ;B[rf]
 ;W[sc]
 ;B[se]
 ;W[ra]
 ;B[pb]
 ;W[sb])
 (;B[rc]
 ;W[qf]
 ;B[pf]
 ;W[qc])))))
 (;B[pe]LB[od:A][of:B][pf:C]C['a' is joseki, 'b' suffers a local loss to make influence.
 'c' is a mistake.
+]
 (;W[od]LB[nc:A][pc:B]C['a' is joseki to attack White. 'b' secures territory on both sides.]
 (;B[nc]LB[pd:A][pf:B]C['a' is correct, 'b' undoes one Black point less.
+]
 (;W[pd]
 ;B[pc]
 ;W[pf]
 ;B[qe]LB[ng:A][og:B]C['a' or 'b'.
+]
 (;W[ng])
 (;W[og]))
 (;W[pf]
 ;B[pd]LB[qf:C][ng:A][og:B]TR[nj]C['a' or 'b' are joseki, 'c' is a variation, which is bad, if there is an additional Black stone on the triangled position.
+]
 (;W[ng])
 (;W[og])
 (;W[qf]LB[of:A][og:B]TR[nj]C['a' or with an additional stone on the triangled position 'b'.]
 (;B[of]
 ;W[og]
 ;B[nf]
 ;W[ng]
 ;B[mf])
 (;AB[nj]
 ;B[og]C[White becomes heavy.]))))
 (;B[pc]LB[md:B][og:A]C[White continues the reduction on 'a' and 'b'.]))
 (;W[of]
 ;B[od]
 ;W[le]LB[lc:A][pf:B][qg:B]C[Black can connect only on one side with 'a' or 'b'.]
 (;B[lc]
 ;W[pf]
 ;B[qf]
 ;W[qg])
 (;B[qg]
 ;W[lc]))
 (;W[pf]
 ;B[of]C[Punishment
+]
 ;W[qf]
 ;B[qe]C[correct shape
 ]))
 (;B[od]LB[ne:B][pe:C][qe:A]C['a' is correct, 'b' and 'c' make White heavy.]
 (;W[qe]LB[rd:B][ne:A]C['a' is correct, 'b' is inferior.]
 (;B[ne]
 ;W[of]
 ;B[rd]
 ;W[nf])
 (;B[rd]
 ;W[me]))
 (;W[ne]
 ;B[pe])
 (;W[pe]
 ;B[qe]))
 (;B[pc])
 (;B[ne]
 ;W[nf]
 ;B[nd]
 ;W[mf]
 ;B[of]
 ;W[og])
 (;B[mc])
 (;B[md]))
 (;W[nd]LB[nc:A][od:B][oe:C][nf:D][of:E]C['a' tries to secure territory.
 'b' and 'c' are joseki.
 'd' is possible.
 'e' is questionable.]
 (;B[nc]LB[ld:B][md:A][dp:C]C['a', 'b' or tenuki 'c' are ok.]
 (;W[md]
 ;B[mc]
 ;W[ld]
 ;B[kb]LB[pe:A][qe:B]C['a' or 'b' are ok.]
 (;W[pe]
 ;B[qe]
 ;W[pg])
 (;W[qe]))
 (;W[ld]LB[md:A][ne:C][nf:B]C['a' takes territory, 'b' attacks.
 'c' is inferior.]
 (;B[md]
 ;W[me]
 ;B[mc]
 ;W[lf]LB[lc:A][pf:B]C['a' or 'b'.]
 (;B[lc]
 ;W[qe]
 ;B[pe]
 ;W[pf]
 ;B[oe]
 ;W[rd])
 (;B[pf]
 ;W[lc]))
 (;B[nf]
 ;W[lf]
 ;B[jf])
 (;B[ne]
 ;W[me]LB[od:B][oe:A]C['a' or 'b' don't help.]
 (;B[oe])
 (;B[od]
 ;W[nf])))
 (;W[dp]))
 (;B[od]LB[ne:C][nf:A][dp:B]C['a' is joseki.
 'b' is bad.
 'c' is heavy.]
 (;W[nf]LB[md:B][ne:A][oe:D][dp:C]C['a' is joseki.
 'b' leaves to many possibilities for White.
 Tenuki 'c' is bad.
 'd' is possible.]
 (;B[ne]
 ;W[me]
 ;B[oe]
 ;W[mf]LB[lc:A][pg:B]C['a' and 'b' are miai.]
 (;B[lc]
 ;W[pg])
 (;B[pg]
 ;W[lc]))
 (;B[md]LB[me:A][qe:B]C['a' is usual, 'b' is also possible.]
 (;W[me]
 ;B[mc]
 ;W[pg])
 (;W[qe]LB[oe:A]C[Threatens 'a'.]))
 (;B[dp]
 ;W[oe]
 ;B[pe]
 ;W[pf]
 ;B[qf]
 ;W[pg]
 ;B[nc]
 ;W[md]
 ;AE[pj]AB[qj]
 ;B[qg]
 ;W[ph]LB[mc:B][qh:A]C[White can cut on 'a' or 'b'.])
 (;B[oe]
 ;W[lg]))
 (;W[dp]
 ;B[ne])
 (;W[ne]LB[mb:A][oe:B]C['a' is usual, 'b' strengthens White.]
 (;B[mb]LB[lc:B][qe:A]C['a' aims for the corner or right side.
 'b' makes a position on the top side.]
 (;W[qe]LB[rd:A][pe:C][pf:B]C['a' secures the corner.
 'b' attacks.
 'c' is useless.]
 (;B[rd])
 (;B[pf]
 ;W[rd]
 ;B[qc]
 ;W[qf]
 ;B[of])
 (;B[pe]
 ;W[qf]LB[rd:A][pf:B]C['a' and 'b' are miai.]
 (;B[rd]
 ;W[pf])
 (;B[pf]
 ;W[rd])))
 (;W[lc]
 ;B[mc]
 ;W[ke]))
 (;B[oe]
 ;W[nf])))
 (;B[oe]
 ;W[od]
 ;B[pd]
 ;W[nc]
 ;B[ob]
 ;W[ld])
 (;B[nf]
 ;W[od]
 ;B[pd]
 ;W[nc]
 ;B[ob]LB[ld:A][of:B]C['a' is correct, 'b' doesn't work.]
 (;W[ld]
 ;B[pf])
 (;W[of]
 ;B[oe]
 ;W[ne]
 ;B[ng]
 ;W[pe]
 ;B[le]))
 (;B[of]LB[od:B][pe:A]C['a' or 'b'.]
 (;W[pe])
 (;W[od]
 ;B[pd]
 ;W[nc])))
 (;W[pe]LB[pd:B][ne:C][qe:A][pg:D]C['a' is correct.
 'b', 'c' and 'd' are disadvantageous.
 'd' tries to attack White, but only makes him strong.]
 (;B[qe]LB[pf:A][pg:B]TR[pj]C['a' or, if the triangled stone is one line lower, 'b' are ok.]
 (;W[pf]LB[nd:A][ne:B][rg:C]C['a' is almost joseki. 'b' is similar. 'c' gives White influence too easy.]
 (;B[nd]
 ;W[qf]
 ;B[nf])
 (;B[ne])
 (;B[rg]
 ;W[nd]
 ;B[nc]
 ;W[ld]))
 (;AE[pj]AB[qj]
 ;W[pg]LB[ne:A][pf:B]C['a' is better than 'b'.]
 (;B[ne])
 (;B[pf]
 ;W[of]
 ;B[qf]
 ;W[og]
 ;B[rh]LB[nd:A][oj:B]C['a' or 'b' are ok.]
 (;W[nd])
 (;W[oj]
 ;B[pl]
 ;W[nc]))))
 (;B[pd]LB[ne:A][oe:B]C['a' is correct, 'b' is heavy.]
 (;W[ne]
 ;B[md]LB[pg:A]C[A is good continuation for both.])
 (;W[oe]
 ;B[nd]LB[qe:B][mf:A][qh:C]TR[pj]C['a' or 'b'.
 Even if the triangled stone is one line lower, 'c' is possible.]
 (;W[mf]
 ;B[pg])
 (;W[qe]
 ;B[mf]
 ;W[qh])
 (;AE[pj]AB[qj]
 ;W[qh]LB[qe:B][oh:A]C['a' or 'b' are miai.]
 (;B[oh]
 ;W[qe])
 (;B[qe]
 ;W[oh]))))
 (;B[ne]
 ;W[qe]
 ;B[rd])
 (;B[pg]
 ;W[qe]
 ;B[pd]LB[ne:B][oe:A]C['a' or 'b' are ok.]
 (;W[oe]
 ;B[nd]
 ;W[ne]LB[md:A][me:B]C['a' is correct. 'b' is questionable.]
 (;B[md]
 ;W[ng])
 (;B[me]
 ;W[mf]
 ;B[le]
 ;W[rd]
 ;B[rc]
 ;W[qc]))
 (;W[ne]
 ;B[md]
 ;W[ng])))
 (;W[pc]
 ;B[pd]
 ;W[ob]LB[pb:A][nc:B]C['a' defends the corner.
 'b' makes the corner a ko.]
 (;B[pb]
 ;W[nc]
 ;B[od]
 ;W[lc])
 (;B[nc]
 ;W[qc]LB[nb:B][rc:C][rd:A]C['a' or 'b' are correct.
 'c' is a mistake.]
 (;B[rd]LB[nb:B][rc:A]C[If 'a', ko. If 'b', White dies.]
 (;W[rc]
 ;B[nb]
 ;W[oa]LB[qa:C][rb:B][sc:A]C['a', 'b' or 'c' make ko.]
 (;B[sc]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[qb]
 ;W[pb]
 ;B[pa])
 (;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[pb]LB[qa:A][ra:B]C['a' or 'b'.]
 (;B[qa]
 ;W[ra]
 ;B[sa])
 (;B[ra]
 ;W[qa]
 ;B[pa]))
 (;B[qa]
 ;W[ra]
 ;B[rb]
 ;W[sb]
 ;B[sa]))
 (;W[nb]
 ;B[mb]
 ;W[rc]
 ;B[na]
 ;W[pa]
 ;B[sc]
 ;W[sb]
 ;B[ra]))
 (;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc]
 ;B[rc])
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[sb])))
 (;W[qe]
 ;B[qg]))
 (;AW[jc]AB[qj]LB[qc:B][rd:A]C['a' is usal.
 'b' is a test move which can be applied if the Black position
 is tighter.]
 (;W[rd]LB[qc:E][rc:A][pd:C][qe:B][re:D]C[Black defends the corner with 'a' or 'c' or takes outside influence with 'b'. The aim of Black 'c' is to avoid giving White any help in making shape.
 'd' and 'e' are disadvantageous.]
 (;B[rc]LB[pd:A][qe:B]C['a' is correct, 'b' makes a base.]
 (;W[pd]
 ;B[qc]
 ;W[pf]
 ;B[qe]
 ;W[nf]LB[nc:A])
 (;W[qe]
 ;B[pd]
 ;W[qh]
 ;B[oj]
 ;W[ql]
 ;B[oh]C[This continuations shows ways for White to live.]
 ;W[rj]LB[ri:B][rk:A]C['a' or 'b'.]
 (;B[rk]
 ;W[pi]
 ;B[pj]
 ;W[ri]
 ;B[qk]
 ;W[re]
 ;B[pf]
 ;W[rg])
 (;B[ri]
 ;W[qi]
 ;B[rk]
 ;W[pj]
 ;B[qk]
 ;W[pk]
 ;B[pi]
 ;W[rh]
 ;B[pl]
 ;W[ok]
 ;B[qm]
 ;W[si]
 ;B[rl]
 ;W[nk])))
 (;B[qe]LB[qc:B][re:A]C['a' is correct. 'b' is inferior, because he ends in gote, but may be necessary, if escaping outside has become impossible.]
 (;W[re]LB[rc:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[qc]
 ;B[pc]
 ;W[qb]LB[sc:B][se:A]C['a' is usual.
 'b' initiates a ko where Black has to find the first ko threat.
 If White wins the ko, Black has suffered a big damage in terms of territory and endgame.]
 (;B[se]
 ;W[sc]
 ;B[sf]
 ;W[ra]
 ;B[pb]
 ;W[sb]CR[sd]LB[qf:A]TR[re]C[Now the triangled White stone shows its value: When the circled liberty is lost (what is double-sente), Black must defend the cut at 'a'.])
 (;B[sc]
 ;W[sb]
 ;B[rb]
 ;W[rc]
 ;B[sa]
 ;W[ra]
 ;B[qa]
 ;W[pb]
 ;B[ob]
 ;W[pa]
 ;B[oa]
 ;W[ra]TR[qf]C[Many local ko threats for White starting on the marked point.]))
 (;B[rc]
 ;W[qf]LB[of:B][qh:A]C['a' or 'b'.]
 (;B[qh]LB[of:A][qg:B]C['a' or 'b' are ok.]
 (;W[of])
 (;W[qg]
 ;B[ph]
 ;W[of]))
 (;B[of]
 ;W[qh])))
 (;W[qc]LB[pc:A][re:B]C[Black continues with 'a' or 'b'.]
 (;B[pc]LB[qb:A][re:B]C[White continues with 'a' or 'b'.]
 (;W[qb]
 ;B[re]
 ;W[sc]LB[ra:B][pb:C][se:A]C['a' and 'b' are correct, 'c' is a mistake.]
 (;B[se]LB[ra:A][pb:B]C['a' is correct, 'b' is questionable.]
 (;W[ra]
 ;B[pb]
 ;W[sb])
 (;W[pb]
 ;B[ob]LB[ra:A][dp:B]C['a' is necessary, tenuki 'b' is a mistake.]
 (;W[ra]
 ;B[pa]
 ;W[sb])
 (;W[dp]
 ;B[ra]
 ;W[rb]
 ;B[sb]
 ;W[sa]
 ;B[sd]
 ;W[qa]
 ;B[rc]C[Ko])))
 (;B[ra]
 ;W[rb]
 ;B[se]
 ;W[sa]
 ;B[sd]
 ;W[rc]
 ;B[pb]
 ;W[qa])
 (;B[pb]
 ;W[rb]C[White has two points more than necessary.]))
 (;W[re]
 ;B[rc]LB[qb:B][qf:A]C[White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pf]
 ;W[qg]
 ;B[pg]
 ;W[ri]
 ;B[qi]
 ;W[qh]
 ;B[ph]
 ;W[rj]
 ;B[qk])
 (;W[qb]
 ;B[rb]
 ;W[qf]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[rg])))
 (;B[re]
 ;W[pc]LB[ob:B][od:A]TR[oe]C['a' is correct now. If Black has additional stones, e.g. a stone on the triangled position, he kills with 'b'.
+]
 (;B[od]LB[ob:A][rb:B]C['a' lives with a threat to connect outside. 'b' makes a ko.]
 (;W[ob]
 ;B[nb]
 ;W[pb]LB[rb:B][mc:A]C['a' lets White live.
 'b' tries to kill but here White can escape to the top.]
 (;B[mc]
 ;W[rc])
 (;B[rb]
 ;W[rc]
 ;B[sd]
 ;W[mb]
 ;B[nc]
 ;W[na]))
 (;W[rb]
 ;B[sd]
 ;W[sc]
 ;B[rc]))
 (;AB[oe]
 ;B[ob]))))
 (;B[pd]
 ;W[re]
 ;B[rc]
 ;W[qh])
 (;B[re]
 ;W[qe]LB[rc:A][pe:C][qf:B]C['a' is the usual continuation.
 If on the right side, there is no Black, but a White stone, 'b' is better.
 If the right side stone is closer, 'c' is good.
+]
 (;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd]LB[nf:A][og:B][pi:C]C[If Black wanted the corner, he could have taken it without giving White influence.
 'a', 'b' or 'c'.]
 (;W[nf]LB[nc:A])
 (;W[og]LB[pf:A][qf:B]C[Playing White 14 at 'a' or 'b' would be too heavy.]
 ;B[qf]
 ;W[qg]
 ;B[pe]
 ;W[oe]
 ;B[rg]
 ;W[pf]
 ;B[sf]
 ;W[qh])
 (;W[pi]))
 (;AE[qj]AW[qi]
 ;B[qf]
 ;W[pe]
 ;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd])
 (;AE[qj]AB[qh]
 ;B[pe]
 ;W[qf]
 ;B[rf]
 ;W[pd]
 ;B[qc]
 ;W[pf]
 ;B[qg]
 ;W[oe]
 ;B[pc]))
 (;B[qc]LB[qe:A][qh:B]C['a' or 'b'.]
 (;W[qe]LB[rc:B][pe:C][qg:A]C[Black continues with 'a' to 'c'.]
 (;B[qg]
 ;W[rc]LB[rb:A][pe:B]C[Black continues with 'a' or 'b'.]
 (;B[rb]LB[oe:B][qf:A]
 (;W[qf]
 ;B[pg]
 ;W[pd]
 ;B[pc]
 ;W[sb]
 ;B[qb]
 ;W[of])
 (;W[oe]))
 (;B[pe]
 ;W[qf]
 ;B[pf]
 ;W[rg]
 ;B[rh]
 ;W[rf]
 ;B[pg]
 ;W[rb]))
 (;B[rc]
 ;W[qh])
 (;B[pe]
 ;W[qf]
 ;B[pf]
 ;W[rc]
 ;B[rb]
 ;W[pd]LB[qb:B][pc:A]C[There may be a ladder associated with White 14. Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[sb]
 ;B[qb]
 ;W[qg]
 ;B[pg]
 ;W[ri])
 (;B[qb]
 ;W[pg]
 ;B[qg]
 ;W[ph]LB[oe:A][rg:B]C[With a White ladder, 'a' and 'b' are miai.]
 (;B[oe]
 ;W[rg])
 (;B[rg]
 ;W[oe]))))
 (;W[qh]LB[qf:A][oi:B]C['a' or 'b'.]
 (;B[qf]
 ;W[oh])
 (;B[oi]
 ;W[qe]))))
 (;W[qc]LB[pc:A][pd:B]C['a' or 'b' are possible. 'b' makes a ko.]
 (;B[pc]
 ;W[rd]LB[rc:A][qe:B]C['a' kills lwaving aji. If 'b', White lives.]
 (;B[rc])
 (;B[qe]
 ;W[qb]))
 (;B[pd]
 ;W[rd]
 ;B[re]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[sd]
 ;W[sc])))
 (;AW[qf][qi]
 ;W[oe]LB[mc:A][nd:B]C['a' is correct, 'b' is questionable.]
 (;B[mc]
 ;W[pc]
 ;B[pd]
 ;W[od]
 ;B[ob]
 ;W[rc]
 ;B[rd]
 ;W[qc]
 ;B[rb]
 ;W[re]
 ;B[sc]
 ;W[pe]LB[qb:B][sb:A]C['a' is correct, 'b' is inferior.]
 (;B[sb]
 ;W[qe]
 ;B[sd])
 (;B[qb]
 ;W[qe]
 ;B[pb]C[Black unnecessarily lost one point territory.]))
 (;B[nd]
 ;W[ne]LB[ld:B][md:A][me:C]C['a' is slow, 'b' is inferior, 'c' doesn't work.]
 (;B[md])
 (;B[ld]
 ;W[pc]
 ;B[pd]
 ;W[od]
 ;B[ob]
 ;W[rc]
 ;B[rd]
 ;W[qc]
 ;B[rb]
 ;W[re]
 ;B[sc]
 ;W[pe]
 ;B[sb]
 ;W[md])
 (;B[me]
 ;W[mf]
 ;B[le]
 ;W[pc]
 ;B[pd]
 ;W[od]
 ;B[nc]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[ob]
 ;W[qb]
 ;B[pb]
 ;W[re]
 ;B[qa]
 ;W[sd]
 ;B[ra]
 ;W[qe]
 ;B[pa]
 ;W[sc]
 ;B[sa]
 ;W[pe])))
 (;AW[jc][mc][qf][qi]LB[pc:B][oe:A]C[Black can secure his group on 'a'. If he doesn't care for the shimari, it will suffer after White 'b'.]PL[W]
 (;B[oe])
 (;W[pc]
 ;B[pd]
 ;W[qc]LB[ob:B][nc:C][od:A]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[rf]
 ;B[se]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[mb]
 ;B[na]
 ;W[ra])
 (;B[ob]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[od])
 (;B[nc]
 ;W[od]
 ;B[md]
 ;W[nd])))
 (;W[ql]
 ;B[qj]
 ;W[qh]LB[pi:b][oj:a]C[Black continues with 'a' or 'b'.]
 (;B[oj]C[ikken tobi (1-space jump)]
 ;W[oh]
 ;B[ol]
 ;W[mh])
 (;B[pi]LB[qe:b][og:a]C[White continues with 'a' or 'b'.]
 (;W[og]
 ;B[qf]
 ;W[ph]
 ;B[oi]
 ;W[mg]
 ;B[mi])
 (;W[qe]LB[pd:a][pe:b][re:c]C[Black continues with 'a' to 'c'.]
 (;B[pd]
 ;W[rd]
 ;B[rc]
 ;W[og]
 ;B[ni]
 ;W[mg])
 (;B[pe]LB[rd:c][pf:b][qf:a]C[White continues with 'a' to 'c'.]
 (;W[qf]
 ;B[rd]
 ;W[og])
 (;W[pf]LB[oe:a][qf:b]C[Black continues with 'a'. Black 'b' does not work, as it gives White a large corner.]
 (;B[oe]
 ;W[rd]LB[re:a][qf:b]C[Black continues with 'a'. Black 'b' lets White live in the corner, a less satisfactory result for Black.]
 (;B[re]
 ;W[qf]
 ;B[rc]
 ;W[of])
 (;B[qf]C[White lives in the corner; a success for White.]
 ;W[re]
 ;B[pg]
 ;W[qc]))
 (;B[qf]C[Black 10 gives White the corner in a big way.]
 ;W[re]
 ;B[pg]
 ;W[of]
 ;B[qg]
 ;W[og]
 ;B[oh]
 ;W[nh]
 ;B[ph]
 ;W[pd]
 ;B[oe]
 ;W[od]
 ;B[ne]
 ;W[nd]
 ;B[me]
 ;W[qc]
 ;B[md]
 ;W[nc]
 ;B[mc]
 ;W[nb]))
 (;W[rd]LB[pd:a][re:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[qf]
 ;B[rc]
 ;W[og])
 (;B[re]
 ;W[qf]LB[rc:a][rf:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]LB[sd:a][oe:b]C[White continues with 'a' or 'b'.]
 (;B[sd]
 ;W[oe]
 ;B[pf]
 ;W[og])
 (;B[oe]
 ;W[og]))
 (;B[rf]LB[pd:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[qc]
 ;W[oe]LB[pf:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[qg]
 ;B[pc]LB[of:a][og:b]C[White continues with 'a' or 'b'.]
 (;W[of]
 ;B[pg]
 ;W[ph]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[pk])
 (;W[og]
 ;B[of]
 ;W[nf]
 ;B[od]
 ;W[oh]))
 (;B[qg]
 ;W[pf]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[pc]
 ;B[qb]
 ;W[pb]))
 (;W[pf]
 ;B[pd]
 ;W[ph]
 ;B[rc]
 ;W[oi]
 ;B[oj]
 ;W[nj]
 ;B[ok]
 ;W[nk]
 ;B[ol]
 ;W[qi]
 ;B[pj]
 ;W[ni])))))
 (;B[re]
 ;W[rd]LB[rc:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[pd]
 ;B[qc]
 ;W[pc]
 ;B[qb]
 ;W[od]
 ;B[qf]
 ;W[md])
 (;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd]
 ;W[og]
 ;B[qf]
 ;W[qg]
 ;B[pe]
 ;W[oe])))))
 (;W[qk]
 ;B[qi]
 ;W[qg]
 ;B[ph]
 ;W[qe]LB[pd:a][rd:c][pe:b][re:d]C[Black continues with 'a' to 'd'.]
 (;B[pd]
 ;W[of]
 ;B[nh]
 ;W[mf])
 (;B[pe]
 ;W[rd]LB[qc:b][re:a]C[Black continues with 'a' or 'b'. 'b' may create a ko.]
 (;B[re]
 ;W[qf]
 ;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[oe]LB[pf:a][og:b]C[Black continues with 'a' or 'b'. Black 'a' is better.]
 (;B[og]
 ;W[of]
 ;B[mg]
 ;W[me])
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[og]
 ;B[nf]))
 (;B[qc]LB[rc:b][pf:a]C[White continues with 'a' or 'b'. 'a' creates a ko. With 'b',
 White sacrifices to get out to the center.]
 (;W[pf]
 ;B[re]
 ;W[rf])
 (;W[rc]
 ;B[rb]
 ;W[qf]
 ;B[sc]
 ;W[og]
 ;B[re]
 ;W[of])))
 (;B[rd]
 ;W[oe]
 ;B[nd]
 ;W[mf])
 (;B[re]
 ;W[rd]
 ;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd]
 ;W[pg]
 ;B[oh]
 ;W[nf]))
 (;W[qj]LB[qh:A][dp:B]C['a' Black approach.
 'b' White continuation.]
 (;B[qh]
 ;W[qf]
 ;B[pg]
 ;W[pe]LB[pd:a][ne:c][of:b]C[Black continues with 'a' or 'b'. In either variation, White gets out to the center.
 White breaks through, unfavorable to Black, if Black plays 'c'.]
 (;B[pd]C[tsuke (attach)]
 ;W[oe]
 ;B[ng]
 ;W[me]
 ;B[mc]
 ;W[lf])
 (;B[of]C[Black 8 does not capture White.]
 ;W[pd]
 ;B[pc]
 ;W[qc]LB[rc:b][rd:a]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[ne]LB[qb:A]C[White aims at 'a' later.]
 ;B[oe]C[The cut doesn't work.]
 ;W[od]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[ob])
 (;B[rc]
 ;W[qb]
 ;B[rd]
 ;W[qe]
 ;B[rb]LB[nd:B][ne:A]C[White escapes on 'a'.
 'b' is a mistake. Altough White can live or escape after 'b',
 he will get a small group for large influence or be hunted.]
 (;W[ne]
 ;B[oe]C[The cut doesn't work]
 ;W[od]
 ;B[nd]
 ;W[nc]
 ;B[md]
 ;W[ob])
 (;W[nd]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[nf]
 ;B[me]
 ;W[rh]LB[rg:A][qi:C][ri:B]C[Black develops both sides on 'a', makes thickness on 'b'.
 'c' splits White into two weaks groups.]
 (;B[rg]
 ;W[qg]
 ;B[ri]
 ;W[ph]
 ;B[qi]
 ;W[og]
 ;B[pi]
 ;W[oh]
 ;B[mf]
 ;W[ng]C[White has a small overconcentrated group while Black developed
 all around.])
 (;B[ri]
 ;W[qi]
 ;B[qg]
 ;W[rg]
 ;B[rf]LB[re:A][og:B]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[mg]C[Black has huge thickness.]
 ;W[ng]C[Safing this stone is very bad, as Black gets many sente moves and huge thickness.]
 ;B[nh]
 ;W[og]
 ;B[oh]
 ;W[pf]
 ;B[ph]
 ;W[sf]
 ;B[mf]
 ;W[of]
 ;B[sd]
 ;W[rj]
 ;B[se]
 ;W[rf]
 ;B[mh])
 (;W[og]
 ;B[re]
 ;W[pf]
 ;B[of]))
 (;B[qi]
 ;W[ri]
 ;B[rg]LB[og:A][qg:B]C['a' gives a bad result.
 'b' is self-deletion.]
 (;W[og]LB[pf:B][qg:A]C['a' is correct, 'b' is bad and depends on the ladder.]
 (;B[qg]
 ;W[pf]
 ;B[oi])
 (;B[pf]
 ;W[qg]
 ;B[ph]
 ;W[oh]
 ;B[pi]
 ;W[pj]
 ;B[oi]LB[ni:A][oj:B]C[If White has the ladder, the result after 'a' is ok. If not, Black is given huge thickness on 'b'.]
 (;W[ni]
 ;B[oj]
 ;W[ok])
 (;W[oj]
 ;B[ni]
 ;W[rf])))
 (;W[qg]
 ;B[rf]LB[og:C][ph:A][pi:B]C[White can choose between three disasters 'a', 'b' or 'c'.]
 (;W[ph]
 ;B[pi]
 ;W[oh]
 ;B[re]
 ;W[og]
 ;B[pf])
 (;W[pi]
 ;B[ph]
 ;W[og]
 ;B[re]
 ;W[pf]
 ;B[of])
 (;W[og]
 ;B[re]
 ;W[pf]
 ;B[of]))))))
 (;B[ne]
 ;W[of]
 ;B[mg]
 ;W[od]
 ;B[nd]
 ;W[pc]
 ;B[pd]
 ;W[oe]
 ;B[pb]
 ;W[nc]
 ;B[qc]
 ;W[ob]
 ;B[pc]
 ;W[og]
 ;B[oh]
 ;W[mf]
 ;B[le]
 ;W[nh]
 ;B[ng]
 ;W[nf]
 ;B[lf]
 ;W[me]
 ;B[md]
 ;W[ld]
 ;B[mc]
 ;W[lg]))
 (;B[dp]LB[rd:B][qe:A]C[White 'a' or 'b' are ok.]
 (;W[qe]C[White prevents Black going outside and gets the side, not the corner.]
 ;B[pe]
 ;W[qf]
 ;B[rd]
 ;W[pf]
 ;B[oe])
 (;W[rd]
 ;B[re]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[qc])))
 (;W[pj]
 ;B[dp]
 ;W[qf]
 ;B[qh]
 ;W[ph]LB[pi:B][qi:A]C['a' is correct, 'b' depends on the ladder.]
 (;B[qi]
 ;W[pi]
 ;B[qj]
 ;W[qk]
 ;B[qg]
 ;W[pg]
 ;B[rf]
 ;W[pf]LB[re:A][rk:B]C['a' or 'b'.]
 (;B[re])
 (;B[rk]C[This move was invented by Cho Hun Hyeon in the 1st Ing Tournament against Nie Weiping 1989. Its purpose is disable White territory on the lower right.]
 ;W[re]
 ;B[ql]
 ;W[pk]
 ;B[sg]
 ;W[qe]
 ;B[lc]))
 (;B[pi]LB[oi:B][qi:A]C['a' with the ladder, 'b' if Black has the ladder.]
 (;W[qi]
 ;B[oi]
 ;W[rh]
 ;B[qj]
 ;W[qg]
 ;B[ri]
 ;W[qh]
 ;B[pk])
 (;W[oi]
 ;B[qi]
 ;W[pg]
 ;B[qj]
 ;W[pk]
 ;B[ql])))
 (;W[rd]
 ;B[re]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[qc]LB[rh:A][qj:B]C['a' or 'b' depending on the context.]
 (;W[rh])
 (;W[qj]
 ;W[pd]LB[pc:A][oe:B]C[Later, White can play here.
 'a' is correct, 'b' wrong]
 (;B[pc])
 (;B[oe]
 ;W[rh]C[Now this is sente.]
 ;B[rc]))))
 (;B[od]LB[mc:B][pc:C][qe:A][dp:D]C[
 Ikken-Tobi Shimari
 ---------------------
 'a' to establish or enlarge a White position on the right side.
 'b' is the usual approach from the top side.
 'c' to make a White position on top, if Black prefers to defend the corner, an empty top side is necessary.
 'd' covers invasions if Black has a larger moyo based on this shimari.
+]
 (;W[qe]LB[pc:D][pd:B][rd:E][pe:A][re:C]TR[lc][mc]C['a' is joseki, 'b' doesn't want to help White, but takes less points.
 'c' is not recommended.
 With a White stone on a triangled position, 'd' is possible.
 'e' is not recommended.]
 (;B[pe]
 ;W[qf]LB[pc:C][rd:A][pg:B]TR[mc]C['a' is joseki, 'b' is a special strategy taking the center for the side.
 'c' is necessary with a White stone on the triangled position.]
 (;B[rd]
 ;W[pf]LB[lc:B][of:A][qj:C]C['a' is joseki. 'b' is a variation to prevent a White stone on top.
 'c' is also possible.]
 (;B[of]
 ;W[og]LB[nf:A][ng:B]C['a' is joseki, 'b' a variation which is somewhat inferior.]
 (;B[nf]LB[mc:B][ng:A]C['a' or 'b' are joseki]
 (;W[ng]
 ;B[mf]LB[kc:B][lc:A][mc:C]C['a' is joseki, 'b' is possible, 'c' is too near.]
 (;W[lc]LB[mb:A][dp:B]C['a' is necessary, tenuki 'b' makes all Black efforts useless.]
 (;B[mb]LB[pc:B][mg:A]C[End of joseki
 Later White continuations on 'a' or 'b'.]
 (;W[mg]
 ;B[lf])
 (;W[pc]
 ;B[pd]
 ;W[lb]LB[mc:A][dp:B]C['a' is necessary, tenuki 'b' loses much territory.]
 (;B[mc])
 (;B[dp]
 ;W[nc])))
 (;B[dp]
 ;W[pc]
 ;B[pd]
 ;W[oc]))
 (;W[kc])
 (;W[mc]
 ;B[kc]))
 (;W[mc]LB[nb:A][kc:B]C['a' is joseki, 'b' is a mistake.]
 (;B[nb]
 ;W[ng]
 ;B[mf]C[End of joseki.]
 ;W[pc]C[Later continuation,]
 ;B[pd]
 ;W[nc]
 ;B[oc]
 ;W[mb])
 (;B[kc]
 ;W[pc]LB[oc:A][pd:B]C['a' results in seki in sente. If 'b', White lives.]
 (;B[oc]LB[ob:B][pd:A]C['a' gives seki. 'b' leads to life or escape.]
 (;W[pd]
 ;B[oe]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[rc]
 ;W[qb]
 ;B[sb]
 ;W[ra]
 ;B[pa])
 (;W[ob]
 ;B[pd]
 ;W[qb]
 ;B[qc]
 ;W[pb]
 ;B[rb]
 ;W[nc]LB[lb:B][ld:A]C['a' closes White in, 'b' drives White out.]
 (;B[ld]
 ;W[lb]
 ;B[kb]
 ;W[na])
 (;B[lb]
 ;W[mb]
 ;B[ma]
 ;W[na]
 ;B[la]
 ;W[lc]
 ;B[kb]
 ;W[kd])))
 (;B[pd]
 ;W[oc]LB[ld:B][ng:A]C['a' is correct. 'b' is a mistake.]
 (;B[ng]LB[qb:A][oh:B]C[White must strenghen his corner somewhere like 'a', not play 'b'.]
 (;W[qb]
 ;B[oh])
 (;W[oh]
 ;B[ld]LB[rb:B][md:A]C['a' or 'b' don't help.]
 (;W[md]
 ;B[qb])
 (;W[rb]
 ;B[nb])))
 (;B[ld]
 ;W[md]
 ;B[le]
 ;W[rb])))))
 (;B[ng]LB[pc:C][nf:A][oh:B]TR[lc]C[The move was played by Sakata Eio against Go Seigen 1953 to get sente on the top site, but is not as good than Black 11 on 'a'.
 'a' is correct, 'b' is submissive, 'c' is not recommended, regardless a White stone on the triangled position.]
 (;W[nf]
 ;B[oe]LB[pc:A]C[No more threat on 'a'.]
 ;W[oh]LB[kc:A][mf:B]C['a' is correct, 'b' makes useless thickness.]
 (;B[kc]
 ;W[mf]
 ;B[md]TR[kc]C[The triangled Black stone is now too close.])
 (;B[mf]
 ;W[nh]
 ;B[mg]
 ;W[lc]))
 (;W[oh]
 ;B[nf]
 ;W[lc]
 ;B[mb]LB[qh:A]C[Black can aim at 'a'.])
 (;W[pc]LB[oc:A][pd:B]C['a' is correct, 'b' is what White wants.]
 (;B[oc]
 ;W[oh]
 ;B[oe])
 (;B[pd]
 ;W[nf]
 ;B[oe]))
 (;AW[lc]
 ;W[pc]
 ;B[oe]LB[oc:A][oh:B]C['a' or 'b' don't give a good result.]
 (;W[oc]
 ;B[pg]
 ;W[qg]
 ;B[oh]
 ;W[pd]C[Not recommended.]
 ;B[qc]C[Black has influence and lives in the corner.])
 (;W[oh]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc]
 ;W[pd]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[re]
 ;B[sc]
 ;W[se]
 ;B[sd]
 ;W[ra]
 ;B[sb]
 ;W[qa]
 ;B[oa]))))
 (;B[lc]
 ;W[ne]
 ;B[md])
 (;B[qj]LB[mc:A][ne:B]C['a' is correct, 'b' is possible..]
 (;W[mc]LB[oc:A][ne:B]C['a' is correct, 'b' is questionable.]
 (;B[oc]
 ;W[ne])
 (;B[ne]
 ;W[pc]))
 (;W[ne]
 ;B[mc])))
 (;B[pg]
 ;W[rd]
 ;B[qc]LB[rc:B][rh:A]C['a' or 'b' are ok.]
 (;W[rh]
 ;B[pi]LB[pf:A]C[Defends against White 'a'.])
 (;W[rc]))
 (;AW[mc]TR[mc]C[The triangled stone has the same effect on the squared position.]MA[lc]
 ;B[pc]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[nf]))
 (;B[pd]
 ;W[qh]LB[kc:B][re:A]C[Later White continues on 'a' or 'b'.])
 (;B[re]
 ;W[rf]
 ;B[pe]
 ;W[qf]
 ;B[rd]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[lc]
 ;B[mb])
 (;AW[mc]
 ;B[pc]
 ;W[pe]
 ;B[rd])
 (;B[rd]
 ;W[pe]LB[pd:A][oe:B]C['a' or 'b'.]
 (;B[pd]
 ;W[pi])
 (;B[oe]
 ;W[pg]LB[pd:A][of:B]C['a' is correct. 'b' is a mistake.]
 (;B[pd]
 ;W[of]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[kd])
 (;B[of]
 ;W[pd]
 ;B[pc]
 ;W[qc]
 ;B[rc]
 ;W[oc]
 ;B[qb]
 ;W[nc]C[Black heavy in the center.]))))
 (;W[mc]LB[nb:A][oc:B]C['a' secures territory and takes away White's base. 'b' is better for as preparation for a later attack.
+]
 (;B[nb]
 ;W[nc]
 ;B[ob]LB[kc:A]C[Black aims at 'a'.])
 (;B[oc]
 ;W[jc]))
 (;W[pc]LB[oc:B][pd:A][dp:C]C['a' is correct. 'b' is also possible.
 'c' shows the variation with White stones in the surrounding.]
 (;B[pd]LB[oc:A][qc:B]C[White goes outside with 'a' or makes a ko on 'b'.]
 (;W[oc]
 ;B[qc]
 ;W[mc]LB[nd:A]C[A is now a big continuation for both.])
 (;W[qc]LB[oc:A][rc:B]C['a' makes a ko, 'b' fails.]
 (;B[oc]LB[rb:B][rd:A]C['a' makes the ko, 'b' dies.]
 (;W[rd]
 ;B[re]LB[rb:A][rc:B]TR[qh]C['a' results in ko. With an additional stone on the triangled position, White lives on 'b'.]
 (;W[rb]
 ;B[sd]
 ;W[sc])
 (;AW[qh]
 ;W[rc]
 ;B[pb]
 ;W[qb]
 ;B[ob]
 ;W[rf]
 ;B[se]
 ;W[sd]
 ;B[qf]
 ;W[sb]))
 (;W[rb]
 ;B[rd]
 ;W[ob]
 ;B[nb]
 ;W[qa]
 ;B[pb]
 ;W[oa]
 ;B[rc]
 ;W[qb]
 ;B[sb]))
 (;B[rc]
 ;W[rb]
 ;B[rd]LB[nb:A][sb:B]C['a' is correct, 'b' dies.]
 (;W[nb]LB[sb:B][nc:A]C['a' is correct, 'b' is questionable.]
 (;B[nc]LB[mb:B][ob:A]C['a' is necessary, 'b' is a mistake.]
 (;W[ob]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[sb])
 (;W[mb]
 ;B[ob]LB[pb:B][oc:A]C['a' or 'b' don't help,]
 (;W[oc]
 ;B[qb])
 (;W[pb]
 ;B[pa])))
 (;B[sb]
 ;W[qb]
 ;B[mc]
 ;W[mb]
 ;B[lc]))
 (;W[sb]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[pa]
 ;W[qb]
 ;B[nb]))))
 (;B[oc]
 ;W[qc]
 ;B[rd]
 ;W[pd]
 ;B[pe]
 ;W[ob]
 ;B[nb]
 ;W[rc]LB[pb:B][qf:A]C['a' is usual. 'b' is correct with more Black surrounding stones.]
 (;B[qf]
 ;W[oa]C[ko])
 (;B[pb]
 ;W[qb]
 ;B[oa]LB[qe:A]C[bad aji on A]))
 (;AW[mc][qg][qj]LB[oc:B][pd:C][qf:A]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[qf]
 ;W[oc]
 ;B[pg]LB[qc:B][qh:A]C['a' or 'b', depending on the further surrounding stones.]
 (;W[qh]
 ;B[qc]
 ;W[rf]
 ;B[re]
 ;W[pf]
 ;B[qe])
 (;W[qc]
 ;B[qh]))
 (;B[oc]
 ;W[pd]
 ;B[pe]
 ;W[qc]LB[oe:B][qe:A]C['a' or 'b' are no help.]
 (;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[oe])
 (;B[oe]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[re]))
 (;B[pd]
 ;W[oc]
 ;B[qc]
 ;W[nd])))
 (;W[dp]LB[jc:A][kc:C][lc:D][pj:F][qj:E][pp:G]TR[oj]C[Several cases:
 - Black on 'a',
 - Black on 'a', 'e' and the triangled position,
 - Black on 'c',
 - Black on 'd' and some more stones.
 - Black on 'd' and 'e',
 - Black on 'e' and 'g',
 - Black on 'g' and 'g'.
+]
 (;AB[jc]LB[lc:A][mc:B][qc:D][kd:C]C['a', 'b' or 'c' are ok.
 'd' is a mistake.]PL[W]
 (;W[lc]
 ;B[kd]LB[ld:A][nd:B]C['a' makes a living group, 'b' prevents being enclosed.]
 (;W[ld]
 ;B[le]
 ;W[me]
 ;B[md]
 ;W[nd]LB[mc:B][ne:A]C['a', closing White in in sente, is correct.
 'b' is a mistake.]
 (;B[ne]
 ;W[mc]
 ;B[mf]
 ;W[oc]
 ;B[md]
 ;W[nc]
 ;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[ke]
 ;B[me]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[pb]
 ;B[qb]
 ;W[oa])
 (;B[mc]
 ;W[nc]
 ;B[mb]
 ;W[ne]
 ;B[lb]
 ;W[lf]
 ;B[ke]
 ;W[pf]))
 (;W[nd]LB[nc:A][ne:B]C['a' is usual. 'b' makes both sides stronger.]
 (;B[nc]
 ;W[ld]
 ;B[ne]
 ;W[le])
 (;B[ne]
 ;W[oc]
 ;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[ld]
 ;B[nf]
 ;W[le])))
 (;W[mc]
 ;B[ld]
 ;W[pc]LB[oc:A][qc:B][pd:C]C['a', 'b' or 'c' enclose a White group.]
 (;B[oc]
 ;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[rc]LB[oe:A]C[White aji to cut at 'a'.])
 (;B[qc]
 ;W[lc]
 ;B[kd]
 ;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[nd]
 ;W[qb]
 ;B[rb]
 ;W[qe]
 ;B[pf]
 ;W[pb]
 ;B[qf]
 ;W[ra]
 ;B[rc]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic])
 (;B[pd]
 ;W[qc]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]))
 (;W[kd])
 (;W[qc]
 ;B[pc]))
 (;AB[jc][oj][qj]PL[W]
 ;W[pc]LB[oc:A][qc:C][pd:B]C[If a White reduction against the moyo is too small, White must try to do more damage by an invasion here.
 'a' forces a ko. 'b' gives White the choice.
 'c' gives life.]
 (;B[oc]
 ;W[qc]
 ;B[rd]
 ;W[pd]
 ;B[pe]
 ;W[ob]
 ;B[nb]
 ;W[qb]
 ;B[oa]
 ;W[pa])
 (;B[pd]LB[oc:B][qc:A]C[If 'a', ko.
 If 'b', White lives.]
 (;W[qc]
 ;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc])
 (;W[oc]
 ;B[qc]
 ;W[lc]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[nc]))
 (;B[qc]
 ;W[lc]
 ;B[kd]
 ;W[oc]
 ;B[pd]
 ;W[ld]
 ;B[le]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[nc]))
 (;AW[ic]AB[kc]PL[W]
 ;W[mc]LB[pc:B][ld:A]C[Black play 'a' or tenuki, after which White enters on 'b'.
+]
 (;B[ld]
 ;W[pc]LB[oc:A][qc:B][pd:C]C['a', 'b' or 'c' enclose White.]
 (;B[oc]
 ;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[rb]LB[oe:A]C[White aji on 'a'.])
 (;B[qc]
 ;W[md]
 ;B[me]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]LB[ib:B][oc:A]C['a' or 'b'.]
 (;W[oc]LB[nd:B][pd:A]C['a' is usual.
 'b' gives more points for sente and more influence and leaves a cut.]
 (;B[pd]
 ;W[nb])
 (;B[nd]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[qf]
 ;W[ra]
 ;B[rc]
 ;W[nc]LB[le:A]C[White aji to cut at 'a'.]))
 (;W[ib]
 ;B[ja]
 ;W[ne]
 ;B[nd]
 ;W[le]
 ;B[mf]
 ;W[kd]
 ;B[lc]
 ;W[jd]
 ;B[mb]
 ;W[nc]
 ;B[nb]
 ;W[oc]
 ;B[la]
 ;W[pd]))
 (;B[pd]LB[oc:B][qc:A]C['a' takes the corner. 'b' is also possible.]
 (;W[qc]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc])
 (;W[oc]
 ;B[qc]
 ;W[md]
 ;B[me]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]
 ;W[nb])))
 (;W[pc]
 ;B[oc]
 ;W[ob]LB[nb:B][pd:A]C['a' influences the right, 'b' the top side.
+]
 (;B[pd]
 ;W[qb]
 ;B[ke]LB[nc:A][qc:B]C[White lives on 'a', or Black aims to kill on 'b'.
+]
 (;W[nc]
 ;B[qc]
 ;W[pb])
 (;B[qc]
 ;W[pb]
 ;B[rb]
 ;W[nc]
 ;B[lb]))
 (;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[oe]
 ;B[pf]
 ;W[na]LB[ma:B][qa:C][mb:A]C['a' is better than 'b'. 'c' fails completely.
+]
 (;B[mb]
 ;W[ra]
 ;B[rc]
 ;W[re]
 ;B[pa]
 ;W[qa]
 ;B[ma]
 ;W[rd]
 ;B[oa]
 ;W[na]
 ;B[oa]
 ;W[sc])
 (;B[ma]
 ;W[mb]
 ;B[oa]
 ;W[nd]
 ;B[na]
 ;W[la])
 (;B[qa]
 ;W[nd]))))
 (;AW[qj][pn][pp]AB[lc][qh]PL[W]
 ;W[qc]LB[pc:A][rd:B]C[White makes a probe to get sente in his attack from the other side.
 'a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[rd]
 ;B[rc]
 ;W[ph]
 ;B[pg]
 ;W[oh]
 ;B[qi]
 ;W[pj]LB[qc:5][dd:B][pf:A]C[Defending with 'a' is necessary.
 After tenuki 'b' White damages Black's position using White 5.]
 (;B[pf])
 (;B[dd]
 ;W[qe]
 ;B[qb]
 ;W[qg]))
 (;B[rd]
 ;W[pc]
 ;B[oc]
 ;W[qg]LB[pg:A][ph:B]C['a' or 'b' don't help.]
 (;B[pg]
 ;W[qf]LB[pd:B][rh:A]C['a' or 'b' are miai.]
 (;B[rh]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[pf]
 ;W[rc]
 ;B[rg]
 ;W[sd]
 ;B[sf]
 ;W[ob]
 ;B[nb]
 ;W[pa])
 (;B[pd]
 ;W[rh]))
 (;B[ph]
 ;W[rf]LB[pd:B][rh:A]C['a' and 'b' are miai.]
 (;B[rh]
 ;W[pd]
 ;B[pe]
 ;W[qe]
 ;B[rc]
 ;W[pf]
 ;B[oe]
 ;W[rb]
 ;B[sb]
 ;W[qb]
 ;B[re]
 ;W[qf]
 ;B[ob]
 ;W[se])
 (;B[pd]
 ;W[rh]))))
 (;AW[jc]AB[lc][qj]LB[nc:C][qc:A][rd:B]C['a', 'b' or 'c',]PL[W]
 (;W[qc]LB[pc:A][rd:B]C['a' or 'b'.]
 (;B[pc]
 ;W[rd]LB[rc:A][qe:B]C['a' takes the corner, 'b' the outsisde.]
 (;B[rc]
 ;W[qe]
 ;B[qb]
 ;W[qh])
 (;B[qe]
 ;W[qb]
 ;B[re]
 ;W[sc]
 ;B[se]
 ;W[ra]
 ;B[pb]
 ;W[sb]))
 (;B[rd]
 ;W[nc]))
 (;W[rd]LB[rc:B][qe:A][re:C]C['a' takes the outside, 'b' the corner, 'c' the right side.]
 (;B[qe]
 ;W[qc]
 ;B[pc]
 ;W[qb]
 ;B[re]
 ;W[sc]
 ;B[se]
 ;W[ra]
 ;B[pb]
 ;W[sb])
 (;B[rc]
 ;W[qe]
 ;B[pd]
 ;W[qh])
 (;B[re]
 ;W[qc]
 ;B[pd]LB[ob:A][nc:B]C[White aims at 'a' or 'b'.]))
 (;W[nc]LB[md:B][nd:A]C['a' or 'b'.]
 (;B[nd]
 ;W[mc]LB[ld:B][md:A]C['a' lets connect, 'b' lets live.]
 (;B[md]
 ;W[lb]
 ;B[ld]
 ;W[nb])
 (;B[ld]
 ;W[lb]
 ;B[kb]
 ;W[ma]
 ;B[kc]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[qc]
 ;W[ra]
 ;B[rc]
 ;W[nb]))
 (;B[md]
 ;W[qc]
 ;B[pc]
 ;W[qb]LB[pb:A][rc:B]C['a' makes a wall to the top, 'b' to the right.]
 (;B[pb]
 ;W[rd]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[qg])
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[pb]
 ;B[oc]
 ;W[ob]
 ;B[nd]
 ;W[mb]))))
 (;B[qj]
 ;AB[pp]LB[qc:C][qh:A][oj:B]C['a' is the correct invasion, 'b' the reduction, 'c' is bad.
+]
 (;W[qh]LB[oh:B][oi:A][pi:C]C['a' and 'b' are ok, 'a' makes a wall to the left, 'b' strengthens the upper side.
 'c' is good to enlargen a moyo on the lower side.
+]
 (;B[oi]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[oh]
 ;W[pf]
 ;B[ng]
 ;W[qg]
 ;B[nf])
 (;B[oh]
 ;W[pi]LB[nj:B][pk:A]
 (;B[pk]
 ;W[oi]
 ;B[mh]
 ;W[nj]
 ;B[nl]
 ;W[lj])
 (;B[nj]
 ;W[pj]
 ;B[qk]))
 (;B[pi]
 ;W[og]))
 (;W[oj]
 ;B[ph]
 ;W[oh]
 ;B[pg]
 ;W[qk]
 ;B[rk]
 ;W[rj]
 ;B[ri]
 ;W[pj]
 ;B[sj]
 ;W[qi]
 ;B[rj]
 ;W[ql]
 ;W[pc]C[Later, White can make ko here.
+]
 ;B[oc]
 ;W[qc]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc])
 (;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[rc]
 ;W[qe]
 ;B[qb]C[White has now damaged the possibility to make a ko in the corner.
+]
 ;W[qh]
 ;B[oi]
 ;W[og]
 ;B[mh]))
 (;B[pj]
 ;AB[pp]PL[B]
 ;W[qh]LB[oh:B][qj:A]C['a' is correct, 'b' is not an attack.
+]
 (;B[qj]
 ;W[oh]
 ;B[pg]C[Makes White heavy.
+]
 ;W[ph]
 ;B[ni]
 ;W[nh]
 ;B[mi]
 ;W[mh]
 ;B[li]
 ;W[kg]
 ;B[mf]
 ;W[lh]
 ;B[ji])
 (;B[oh]LB[qj:B][rj:A]C['a' is correct. 'b' is an overplay.
+]
 (;W[rj]
 ;B[qk]
 ;W[rk]
 ;B[qm]
 ;W[rl]
 ;B[rm]
 ;W[qf]
 ;B[jp])
 (;W[qj]
 ;B[qk]
 ;W[pk]LB[qi:B][oj:A]C['a' is best with the ladder. 'b' is not.
+]
 (;B[oj]
 ;W[ql]
 ;B[rk]
 ;W[rj]
 ;B[rl]LB[pl:A][qm:B]C['a' doesn't try to kill. 'b' fails without the ladder.
+]
 (;W[pl]
 ;B[qm])
 (;W[qm]
 ;B[pl]
 ;W[ok]
 ;B[pm]
 ;W[rm]
 ;B[nk]))
 (;B[qi]
 ;W[rj]
 ;B[oj]
 ;W[ql]
 ;B[ri]
 ;W[rk]
 ;W[rh]C[Later.
+]
 ;B[si]
 ;W[ph]
 ;B[pi]
 ;W[og]))))))
 (;B[nc]LB[lc:D][od:F][pd:E][ne:H][oe:G][qe:I][qf:C][qj:B][dp:A]C[
 Oogeima Shimari
 -------------------
 Reductions after White tenuki 'a' or 'b'.
 Invasions with an additional White stone on 'c' or 'd'.
 Black continuations to forestall White attacks are usually 'e' or 'f'.
 Black 'g' puts emphasis on the right side. Black 'H' makes White on D powerless.
 Black 'i' is a special case, usually not recommended.
+]
 (;W[dp]
 ;B[qj]LB[od:A][rd:D][ne:B][qf:C]C['a' or 'b' reduce.
 'c' is an invasion.
 'd' is correct, if there is an additional Black stone on 'b'.]
 (;W[od]LB[oc:A][nd:B]C['a' is correct, 'b' helps White.]
 (;B[oc]
 ;W[pd]LB[pc:A][qc:B]C['a' is joseki, 'b' helps White.]
 (;B[pc]
 ;W[qe]
 ;B[rd]
 ;W[of]LB[me:B][qf:A]C[Black can continue on 'a' or 'b'.])
 (;B[qc]
 ;W[qe]LB[pe:D][re:A][qf:C][qg:B]C['a' is better than 'b' which loses a lot of territory.
 'c' doesn't connect,
 'd' doesn't prevent White from settling his group.]
 (;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qh])
 (;B[qg]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[rb]LB[nd:A][og:B]C['a' or 'b'.]
 (;W[nd]
 ;B[mc]
 ;W[md]
 ;B[re]C[Black cannot connect.]
 ;W[rd]
 ;B[rc]
 ;W[rf])
 (;W[og]))
 (;B[qf]
 ;W[re])
 (;B[pe]
 ;W[qf])))
 (;B[nd]
 ;W[oe]))
 (;W[ne]LB[ld:E][nd:D][od:G][pd:C][me:F][pe:A][pf:B]TR[oj]C[The White move is recommended if there is an additional Black stone on the triangled position.
 'a' and 'e' are joseki.
 'a' secures the right side.
 'b' is too light.
 'c' or 'g' leave the right side open.
 'd' gives White the choice.
 'e' defends the corner.
 'f' gives White influence.]
 (;B[pe]
 ;W[pc]LB[oc:C][qc:A][od:B]C['a' is correct, 'b' and 'c' are inferior.]
 (;B[qc]LB[mc:A][ld:B]C['a' settles immediately, 'b' is light.]
 (;W[mc]
 ;B[mb]
 ;W[nb]LB[ob:A][lc:B]C['a' is joseki. 'b' loses territory.]
 (;B[ob]
 ;W[nd]LB[na:B][oc:A]C['a' is correct. 'b' is gote and inferior.]
 (;B[oc]
 ;W[lb]
 ;B[na]
 ;W[ld])
 (;B[na]
 ;W[oc]
 ;B[nb]
 ;W[lc]
 ;B[dd]C[If Black never adds a stone, White can later force a ko.]
 ;W[pb]
 ;B[od]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[lb]
 ;B[pd]
 ;W[pa]
 ;B[sa]
 ;W[la]
 ;B[qa]))
 (;B[lc]LB[oc:A][md:B]C['a' settles White, 'b' is inferior, gives a ladder.]
 (;W[oc]
 ;B[md]
 ;W[nd]
 ;B[mc]
 ;W[oe]
 ;B[pg]
 ;W[me])
 (;W[md]
 ;B[ob]
 ;W[lb]
 ;B[na]
 ;W[kc])))
 (;W[ld]))
 (;B[od]
 ;W[qc]LB[ob:B][rd:A]
 (;B[rd]
 ;W[ob]
 ;B[nb]LB[oc:A][rc:B]C[If 'a', 10,000 year ko or hunt. If 'b', ko (an inferior result).]
 (;W[oc]LB[rb:B][nd:A]C['a' encloses the corner, 'b' drives the White stones out to attack them further.]
 (;B[nd]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[qa])
 (;B[rb]
 ;W[nd]
 ;B[lc]
 ;W[pd]LB[oe:B][pf:A]C['a' is correct. 'b' is a mistake.]
 (;B[pf]
 ;W[oe])
 (;B[oe]
 ;W[rc]
 ;B[sc]
 ;W[qe]LB[re:A][qf:B]C['a' or 'b' don't help.]
 (;B[re]
 ;W[qf]
 ;B[pg]
 ;W[rf]
 ;B[sb]
 ;W[sd]
 ;B[se]
 ;W[sf]
 ;B[sd]
 ;W[qb])
 (;B[qf]
 ;W[re]
 ;B[se]
 ;W[sd]
 ;B[rd]
 ;W[rf]))))
 (;W[rc]LB[oa:B][oc:A]C[If 'a', ko. If 'b', White lives.]
 (;B[oc]LB[oa:A][pa:C][pb:B]C[If 'a', ko. If 'b' or 'c', White dies.]
 (;W[oa]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[qa]
 ;W[pb]
 ;B[sa])
 (;W[pb]
 ;B[oa]
 ;W[pd]
 ;B[qe]
 ;W[oe]
 ;B[ld])
 (;W[pa]
 ;B[sc]
 ;W[sb]
 ;B[ra]LB[qa:B][qb:A]C['a' or 'b' don't live.]
 (;W[qb]
 ;B[na])
 (;W[qa]
 ;B[na]
 ;W[rb]
 ;B[pb]
 ;W[pd]
 ;B[qe]
 ;W[oe]
 ;B[lc])))
 (;B[oa]
 ;W[pa]
 ;B[na]
 ;W[oc]LB[qa:A][nd:B]TR[ob]C[The move secures the triangled stone and life, the cut at 'b' is a threat for later.
 'a' or 'b' don't kill..]
 (;B[qa]
 ;W[ra]
 ;B[pb]
 ;W[qb]
 ;B[pa]
 ;W[sb]
 ;B[nd])
 (;B[nd]
 ;W[ra]))))
 (;B[ob]LB[mb:B][qf:A]C[White continuations on 'a' or 'b'.]))
 (;B[oc]
 ;W[qc]LB[rc:C][pd:A][rd:B]C[White can keep the aji of this move in reserve.
 'a' or 'b' lead to ko. If 'c', White connects outside.]
 (;B[pd]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc])
 (;B[rd]
 ;W[rc]
 ;B[pd]
 ;W[ob]
 ;B[nb]
 ;W[oa]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[qa]
 ;W[pb]
 ;B[sa])
 (;B[rc]LB[pd:B][rd:A][ne:6]C['a' is correct, 'b' lives, but gives Black huge influence and hurts White 6.]
 (;W[rd]LB[pd:B][re:A]C['a', aiming to hunt Whitem is correct.
 'b' gives White life which is inferior.]
 (;B[re]
 ;W[pd]
 ;B[sd]
 ;W[od]
 ;B[ld]
 ;W[qf]
 ;B[qe]LB[of:B][ng:A]
 (;W[ng]
 ;B[qg])
 (;W[of]
 ;B[qg]))
 (;B[pd]
 ;W[rb]
 ;B[re]
 ;W[sc]))
 (;W[pd]LB[od:A][qe:B]C['a' takes influence, 'b' aims to hunt White.]
 (;B[od]LB[rd:A][qe:B]C['a' is correct. 'b' is a mistake.]
 (;W[rd]
 ;B[qe]
 ;W[rb]
 ;B[qb]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[re]
 ;W[sc]
 ;B[oe])
 (;W[qe]
 ;B[rd]))
 (;B[qe]
 ;W[od]
 ;B[ld]
 ;W[rb]
 ;B[rd])))))
 (;B[pf]
 ;W[pc]
 ;B[qc]
 ;W[mc]
 ;B[mb]
 ;W[nb]
 ;B[ob]
 ;W[oc]LB[na:A][nd:B]C['a' or 'b' don't help.]
 (;B[na]
 ;W[nd]
 ;B[nb]
 ;W[lc]LB[pb:A]C[White threatens a ko on 'a'.])
 (;B[nd]
 ;W[pe]
 ;B[qe]
 ;W[md]))
 (;B[pd]LB[mc:B][pf:A]C['a' is correct, 'b' is what Black wants.]
 (;W[pf])
 (;W[mc]
 ;B[mb]
 ;W[nb]
 ;B[nd]))
 (;B[nd]LB[me:B][oe:A]C['a' is correct, 'b' takes all pressure from Black.]
 (;W[oe]LB[pd:A][pp:B]C['a' is necessary, tenuki 'b' loses the corner,]
 (;B[pd]LB[le:A][qf:B]C['a' or 'b'.]
 (;W[le])
 (;W[qf]))
 (;B[pp]
 ;W[qc]
 ;B[pd]
 ;W[pc]
 ;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]
 ;W[ob]
 ;B[nb]
 ;W[pb]))
 (;W[me]
 ;B[oe]
 ;W[of]
 ;B[pe]))
 (;B[ld]LB[oc:A][pe:B]TR[oj]C['a' tries to take the upper side. 'b' makes light shape to the
 center, if there is an additional Black stone on the triangled
 position, keeping 'a' in reserve.]
 (;W[oc]LB[ob:B][od:A]C['a' is correct, 'b' is inferior.]
 (;B[od]
 ;W[nd]LB[pc:A][oe:B]C['a' is correct, 'b' gives Black much territory.]
 (;B[pc]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[oc]
 ;W[md]
 ;B[le])
 (;B[oe]
 ;W[mc]
 ;B[nb]LB[lc:A][pc:B]C['a' takes the outisde, 'b' the corner.]
 (;W[lc]
 ;B[ob]
 ;W[kd]
 ;B[nf]
 ;W[le])
 (;W[pc]
 ;B[mb]
 ;W[qc]
 ;B[qe]
 ;W[rb]
 ;B[rd]
 ;W[qa])))
 (;B[ob]
 ;W[pc]))
 (;AB[oj]
 ;W[pe]
 ;B[pd]
 ;W[oh]
 ;B[qh]
 ;W[mh]
 ;B[pp]C[Continuation for White follows.]
 ;W[mc]
 ;B[md]
 ;W[oc]
 ;B[od]
 ;W[nd]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[kc]))
 (;B[me]LB[nd:B][mf:A]C['a' goes outside, 'b' slides into the corner.]
 (;W[mf]
 ;B[md]LB[lf:B][nf:A]C['a' is usual, 'b' emphasizes the center.]
 (;W[nf]LB[id:B][od:A]C['a' is correct, any other move like 'b' is a mistake.]
 (;B[od]
 ;W[kf])
 (;B[id]
 ;W[oc]
 ;B[od]
 ;W[nd]LB[mc:B][pc:A]C['a' or 'b' don't help.]
 (;B[pc]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[oc]LB[ld:B][le:A]C['a' sacrifices for a strong wall.
 'b' initiates a ladder.]
 (;W[le]
 ;B[ld]
 ;W[kd]
 ;B[lc]
 ;W[kc]
 ;B[lb]
 ;W[kf])
 (;W[ld]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[lg]))
 (;B[mc]
 ;W[pd]
 ;B[oe]
 ;W[pe]
 ;B[of]
 ;W[og]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri])))
 (;W[lf]))
 (;W[nd]
 ;B[md]
 ;W[oc]))
 (;B[od]
 ;W[pf]))
 (;W[qf]
 ;B[qh]LB[qc:B][od:A]C['a' to live on the side and center. 'b' takes the corner.]
 (;W[od]
 ;B[oc]
 ;W[rd]LB[qc:A][rc:B]TR[qj]C['a' is correct, 'b' only makes White more solid.
 If the triangled stone is farther away, 'b' is correct and 'a' wrong.
+]
 (;B[qc]
 ;W[of]LB[pd:B][qe:A]C[White continuations on 'a' and 'b'.])
 (;B[rc]
 ;W[pd]LB[pc:B][qc:A]C['a' is correct, 'b' is bad.
+]
 (;B[qc]
 ;W[pc]
 ;B[pb]
 ;W[qb]LB[ob:B][rb:A]C['a' is correct. 'b' is a mistake.]
 (;B[rb]
 ;W[of])
 (;B[ob]
 ;W[qe]LB[rb:A][re:B]TR[qh][qj]C['a' is correct, 'b' is a mistake, weakening the triangled stones.]
 (;B[rb]
 ;W[of])
 (;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sb]
 ;B[sc]
 ;W[rf]
 ;B[qa]
 ;W[sf]
 ;B[ra]
 ;W[of])))
 (;B[pc]
 ;W[qe]
 ;B[qc]
 ;W[of]))
 (;AE[qj]AB[qk]LB[qc:B][rc:A]C['a' is correct, 'b' wrong.
+]
 (;B[rc]
 ;W[pd]LB[pc:B][qc:A]C['a' is correct, 'b' is bad.
+]
 (;B[qc]LB[pc:A][of:B]C['a' is correct, 'b' is too early.
+]
 (;W[pc]
 ;B[pb]
 ;W[qb]LB[ob:B][rb:A]C['a' is correct, 'b' is not recommended.
+]
 (;B[rb]
 ;W[of]LB[ob:B][qe:A]C[End of joseki.
 Black has no strong attack, because 'a' and 'b' are miai.
+]
 (;B[qe]
 ;W[ob]
 ;B[qa]
 ;W[md])
 (;B[ob]
 ;W[qe]))
 (;B[ob]
 ;W[qe]LB[rb:A][re:B]C['a' is ok, 'b' is questionable.
+]
 (;B[rb]
 ;W[of]C[Now White has more stability than necessary.
 ])
 (;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sb]
 ;B[sc]
 ;W[rf]
 ;B[qa]
 ;W[of]
 ;W[sg]LB[se:A][rj:B]C[Later, White can use this aji and play ko for the corner on 'a' or undermine Black's right group on 'b'.
 ])))
 (;W[of]
 ;B[qe]LB[pc:A][pe:C][pf:B]C['a' is correct, 'b' and 'c' are mistakes.
+]
 (;W[pc]
 ;B[pb]
 ;W[qb]LB[ob:B][rb:A]C[Asking move. Will Black play 'a' or 'b'?
+]
 (;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[md]LB[nb:C][nd:A][pf:B]C['a' is possible and leads to middle game fighting. 'b' is not recommended. 'c' allows White tenuki.
+]
 (;B[nd]
 ;W[ne]
 ;B[mc]
 ;W[lc]
 ;B[ld]
 ;W[me]LB[nb:B][kc:A]C['a' is correct, 'b' unnecessarily gives White a ladder.
+]
 (;B[kc]
 ;W[lb]
 ;B[nb]
 ;W[jc])
 (;B[nb]
 ;W[kd]))
 (;B[pf]
 ;W[nb]
 ;B[mc]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[oa]
 ;W[nd]
 ;B[na]
 ;W[ke])
 (;B[nb]
 ;W[qm]C[White can play elsewhere, e.g., attack the two Black stones on the right side.
+]
 ;B[nd]
 ;W[mf]C[White doesn't need to care to safe all stones.
 ]))
 (;B[ob]
 ;W[qg]
 ;B[ph]
 ;W[re]
 ;B[rb]
 ;W[rh]
 ;B[ri]
 ;W[rg]
 ;B[qn]
 ;W[og]))
 (;W[pf]
 ;B[oh])
 (;W[pe]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[ph]
 ;B[qi])))
 (;B[pc]
 ;W[qe]
 ;B[qc]
 ;W[of]))
 (;B[qc]
 ;W[of]C[White has good shape.
+]
 ;B[qe]C[Black has no good attack. The continuation is given only as proof.
+]
 ;W[qg]LB[re:B][ph:A]C['a' and 'b' are miai for White to make sabaki.
+]
 (;B[ph]
 ;W[re])
 (;B[re]
 ;W[ph]))))
 (;W[qc]TR[qh][qj][dp]C[These variations are covered in the branching without the triangled stones.
 ]))
 (;AB[ne]
 ;W[rd]LB[qc:A][rc:D][qe:B][re:C]C['a' and 'c' defend territory driving White out.
 'b' encloses a White ko in the corner.
 'd' is not recommended giving White good shape.]
 (;B[qc]
 ;W[qh]LB[qf:A][pi:B]C['a' is correct, 'b' gives White good shape.]
 (;B[qf]
 ;W[oh])
 (;B[pi]
 ;W[qe]))
 (;B[qe]LB[qc:A][re:B]C['a' makes the corner ko, 'b' gives Black a huge influence.]
 (;W[qc]
 ;B[re]
 ;W[pb]LB[ob:A][rc:B]C['a' closes White in, 'b' is inferior and drives White out.]
 (;B[ob]
 ;W[rb]
 ;B[sd]
 ;W[sc])
 (;B[rc]
 ;W[nb]))
 (;W[re]LB[rc:A][rf:B]C['a' attacks White in sente, 'b' encloses the corner in gote and overconcentration.]
 (;B[rc]
 ;W[qh]
 ;B[oj]
 ;W[qf]LB[pf:A][rg:B]C['a' makes overwhelming thickness, 'b' drives White out to attack the group through the center.]
 (;B[pf]
 ;W[qg]
 ;B[sd]
 ;W[rf]
 ;B[oh]
 ;W[rj]LB[ri:B][rk:A]
 (;B[rk]
 ;W[ri]
 ;B[qk]
 ;W[sg])
 (;B[ri]
 ;W[qi]
 ;B[rk]
 ;W[pj]
 ;B[qk]
 ;W[rh]
 ;B[sj]
 ;W[oi]
 ;B[ni]
 ;W[pi]
 ;B[ok]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[nh]
 ;W[pe]
 ;B[of]
 ;W[qc]
 ;B[pd]
 ;W[rb]))
 (;B[rg]
 ;W[rf]
 ;B[rh]
 ;W[ri]
 ;B[qi]
 ;W[qg]
 ;B[rj]
 ;W[ng]))
 (;B[rf]
 ;W[qc]
 ;B[pc]
 ;W[qb]
 ;B[se]
 ;W[sc]
 ;B[sf]
 ;W[ra]
 ;B[pb]
 ;W[sb]
 ;B[qf])))
 (;B[re]
 ;W[qe]
 ;B[rc]
 ;W[pd]
 ;B[qc]
 ;W[rf]
 ;B[sd]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[qf]
 ;W[qg]
 ;B[pf]
 ;W[rh])
 (;B[rc]
 ;W[qe]
 ;B[pd]
 ;W[qh])))
 (;W[qj]
 ;B[qg]
 ;W[pf]
 ;B[qf]LB[oc:B][pc:A]C['a' or 'b' are ok, in both cases White needs the ladder.]
 (;W[pc]LB[qc:A][od:C][pd:B]C['a' or 'b' are ok.
 If Black has the ladder, the punishment is possible after 'b'.
 With 'c', White can live in the corner.
+]
 (;B[qc]
 ;W[pd]
 ;B[ne]
 ;W[nf]
 ;B[me]LB[pb:A]C[Later, Black can connect on 'a'.]
 ;B[pb]
 ;W[ob]
 ;B[oc])
 (;B[pd]
 ;W[oc]LB[nd:B][od:A]C['a' if White has the ladder and Black wants the corner.
 'b' punishes with a Black ladder or makes a wall to the left without.
+]
 (;B[od]
 ;W[nb]
 ;B[mb]
 ;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[ob]
 ;W[ma]
 ;B[pb])
 (;B[nd]
 ;W[od]
 ;B[oe]
 ;W[nb]
 ;B[mb]
 ;W[ob]LB[qc:B][ne:A]C['a' is usual, 'b' kills with the ladder.
+]
 (;B[ne]
 ;W[rc])
 (;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[mc]
 ;B[lb]
 ;W[ne]
 ;B[md]
 ;W[nf]
 ;B[of]
 ;W[lc]
 ;B[kc]
 ;W[ld]
 ;B[me]
 ;W[kd]
 ;B[jc]
 ;W[mf])))
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[qe]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rc]))
 (;W[oc]LB[pc:B][od:A]C['a' gives perfect influence.
 'b' doesn't, but Black gets only a ko.
 The punishment, if Black has the ladder, is after 'a'.]
 (;B[od]
 ;W[pc]
 ;B[nd]
 ;W[pd]
 ;B[pe]
 ;W[qc]
 ;B[rd]
 ;W[oe]
 ;B[qe]
 ;W[nb]
 ;B[mb]
 ;W[ob]LB[lc:A][rc:B]C['a' if White has the ladder.
 'b' punishes if Black has the ladder.]
 (;B[lc]
 ;W[rc])
 (;B[rc]
 ;W[mc]
 ;B[lb]
 ;W[ne]
 ;B[md]
 ;W[lc]
 ;B[kc]
 ;W[ld]
 ;B[me]))
 (;B[pc]
 ;W[od]
 ;B[ob]
 ;W[nb]
 ;B[mb]
 ;W[nd]
 ;B[mc]
 ;W[pb]
 ;B[na]
 ;W[qc]
 ;B[pd]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[pa]
 ;W[qa]
 ;B[qb]C[Black can try to swallow the White center stones for the ko.])))
 (;AW[qf]
 ;W[qc]LB[pc:B][rc:D][pd:A][rd:C][qe:E]C['a' -> White lives, Black builds a wall.
 With 'b', White connects, but does not yet live.
 'c' is not recommended.
 'd' pushes White to the top side and risks an almighty ko.
 'e' is inferior.
+]
 (;B[pd]LB[pc:A][rd:B]C['a' is usual, 'b' is possible.
+]
 (;W[pc]
 ;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[pf]
 ;B[oe]
 ;W[pb])
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]LB[oa:B][pc:A]C[White lives on 'a', or Black kills on 'b'.
+]
 (;W[pc]
 ;B[me])
 (;B[oa]
 ;W[pb]
 ;B[sd])))
 (;B[pc]LB[qb:C][rc:A][pd:B][rd:D]C['a' is correct. White will connect,
 'b' is disadvantageous. White is separated small in the corner.
 'c' is a mistake. White dies.
 'd' is a mistake.
+]
 (;W[rc]LB[pd:B][rd:A]C['a' is correct, 'b' is lame, but better if White has the ladder.
+]
 (;B[rd]LB[pb:B][pd:A]C['a' is correct, White connects.
 'b' is wrong, White lives small.
+]
 (;W[pd]LB[pb:D][rb:C][od:B][pe:A]C['a' is correct, White lives or goes outside.
 'b' results in ko.
 'c' is ok.
 'd' is a mistakes.
+]
 (;B[pe]
 ;W[od]LB[oc:A][qe:B]C['a' is correct, 'b' wrong.
+]
 (;B[oc]LB[pb:B][qe:A]C['a' White lives in the corner, 'b' White sacrifices the corner for outside strength.
+]
 (;W[qe]LB[ne:B][oe:A]C['a' with the ladder, 'b' without.
+]
 (;B[oe]LB[nd:B][sd:A]C['a' White connects.
 If Black made the mistake of allowing this variation without having the ladder, White punishes on 'b'.]
 (;W[sd]
 ;B[re]
 ;W[rf]
 ;B[nd]
 ;W[pd])
 (;W[nd]
 ;B[md]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[le]))
 (;B[ne]
 ;W[oe]
 ;B[of]
 ;W[pf]
 ;B[nd]
 ;W[pe]
 ;B[pg]))
 (;W[pb]
 ;B[ob]
 ;W[oe]
 ;B[rf]
 ;W[of]LB[re:B][qg:A]C['a' or, with an additional stone 'b'.
+]
 (;B[qg]
 ;W[re]
 ;B[qe]
 ;W[pf]
 ;B[se]
 ;W[qa]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[ld])
 (;AB[qh]
 ;B[re]
 ;W[qa]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[ld])))
 (;B[qe]
 ;W[oc]))
 (;B[od]LB[pb:B][pe:A]C['a' -> ko, 'b' -> White lives. White usually prefers the ko.]
 (;W[pe]
 ;B[rb]LB[pb:A][qb:B]C['a' or 'b' -> Ko.]
 (;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[sc]
 ;W[re]
 ;B[pa])
 (;W[qb]LB[pb:B][sc:A]C['a' -> Ko, 'b' is a mistake -> White captures.]
 (;B[sc]
 ;W[pb]
 ;B[ob]
 ;W[re]
 ;B[pa]
 ;W[oc])
 (;B[pb]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[sd]
 ;W[re]
 ;B[pa]
 ;W[sa]
 ;B[rb]
 ;W[qe])))
 (;W[pb]LB[ob:B][pe:A]TR[qd][rd]C[If 'a', White lives. If 'b', ko.
 In all variations of this invasion, Black must not choose the ko if he doesn't win it, because if he loses it, he loses the two triangled stones. If Black instead of playing ko lets White live in the corner, he keeps these two stones and can destroy the right side with them. Because of this and because Black must find the first ko threat, playing the ko is usually not attractive for Black.]
 (;B[pe]
 ;W[rb]
 ;B[qa]
 ;W[ra]
 ;B[sc]
 ;W[sb]
 ;B[ob]
 ;W[pa]
 ;B[oa]
 ;W[qb])
 (;B[ob]
 ;W[pe]
 ;B[rb]
 ;W[qb]
 ;B[sc]
 ;W[re]
 ;B[pa]
 ;W[oc])))
 (;B[rb]LB[pb:B][qb:C][oc:A]C['a' is correct.
 'b' takes a small corner in gote and gives Black a huge wall.
 If 'c', White dies.
+]
 (;W[oc]
 ;B[pb]
 ;W[od]
 ;B[ob]
 ;W[re]
 ;B[qb]
 ;W[qe]
 ;B[sc]
 ;W[of])
 (;W[pb]
 ;B[oc]
 ;W[qb]LB[ra:B][pe:A]C['a' keeps White divided. 'b' is wrong.]
 (;B[pe]
 ;W[ra])
 (;B[ra]
 ;W[qe]
 ;B[sc]
 ;W[re]
 ;B[sd]
 ;W[sb]
 ;B[sa]
 ;W[se]))
 (;W[qb]
 ;B[pb]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[pe]
 ;W[sd]
 ;B[re]
 ;W[od]
 ;B[rf]))
 (;B[pb]
 ;W[qe]
 ;B[od]
 ;W[pe]
 ;B[rb]
 ;W[re]
 ;B[qb]
 ;W[sd]))
 (;W[pb]LB[ob:C][qb:D][oc:B][pd:A]C[If 'a', White lives small in gote, Black has a perfect wall.
 If 'b', White lives; Black has a cut.
 If 'c', a ko results.
 If 'd', White lives with even more points.
+]
 (;B[pd]LB[ob:B][rb:A]C['a' lives, 'b' runs.
+]
 (;W[rb]
 ;B[ob]
 ;W[qa])
 (;W[ob]
 ;B[rb]
 ;W[qb]
 ;B[sc]
 ;W[nb]
 ;B[mc]))
 (;B[oc]LB[qa:B][rb:A]C['a' White lives.
 'b' White dies.]
 (;W[rb]LB[pd:A]C[Later, White may use the aji of the cut on 'a'.
+]
 ;B[qa]C[Proof of life.
+]
 ;W[ra]
 ;B[sc]
 ;W[sb]
 ;B[pa]
 ;W[ob])
 (;W[qa]
 ;B[oa]
 ;W[sb]
 ;B[ra]
 ;W[rb]
 ;B[ob]))
 (;B[ob]
 ;W[pd]LB[oc:B][od:A]C['a' is correct and ko. 'b' is wrong and gives the corner to White without fighting.]
 (;B[od]
 ;W[pe]
 ;B[rb]
 ;W[qb]
 ;B[sc]
 ;W[re]
 ;B[pa]
 ;W[oc])
 (;B[oc]
 ;W[qe]))
 (;B[qb]
 ;W[oc]
 ;B[pd]
 ;W[ob]
 ;B[od]
 ;W[nb]
 ;B[mc]
 ;W[rb])))
 (;B[pd]
 ;W[rd]))
 (;W[pd]LB[pb:E][qb:C][rc:B][od:D][rd:A]C['a': White lives small in the corner, Black builds a big wall; good for Black.
 'b' is similar to 'a'.
 'c': Black wall, White lives small in the corner; good for Black.
 'd': White lives, Black is overconcentrated; good for White.
 'e': nonsense.
+]
 (;B[rd]LB[pb:A][oc:B]C['a' White lives in the corner. 'b' White fails severely.]
 (;W[pb]
 ;B[oc]
 ;W[rc]
 ;B[pe]
 ;W[rb]C[Good for Black.]
 ;B[qa]
 ;W[ra]
 ;B[sc]
 ;W[sb]
 ;B[ob]
 ;W[pa])
 (;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[od]
 ;W[pe]
 ;B[nb]
 ;W[qb]
 ;B[oa]
 ;W[rc]
 ;B[sb]C["Three eggs" tesuji.]
 ;W[sc]
 ;B[sd]
 ;W[re]
 ;B[qa]))
 (;B[rc]
 ;W[qb]LB[pb:B][rb:C][od:A][rd:D]C['a': White lives small; good for Black.
 'b' connects better than necessary.
 'c': White wall outside.
 'd': nonsense.
+]
 (;B[od]LB[rd:A][pe:B]C['a': White lives small.
 'b': White dies.
+]
 (;W[rd]
 ;B[pe]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[qe])
 (;W[pe]
 ;B[re]
 ;W[pb]
 ;B[oc]
 ;W[rb]
 ;B[rf]
 ;W[qg]
 ;B[sb]))
 (;B[pb]
 ;W[rd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[pf]
 ;B[oe]
 ;W[rb])
 (;B[rb]LB[pb:B][rd:A]C['a' is correct. 'b' is a mistake.]
 (;W[rd]
 ;B[qe]
 ;W[pe]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[qa]
 ;W[nd])
 (;W[pb]
 ;B[oc]
 ;W[rd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[pf]
 ;B[oe]LB[sb:A][sc:B]C['a' or 'b' don't help.]
 (;W[sb]
 ;B[ra]
 ;W[sc]
 ;B[ob])
 (;W[sc]
 ;B[ra]
 ;W[sb]
 ;B[ob])))
 (;B[rd]
 ;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[pe]
 ;W[od]C[Disaster for Black.]))
 (;B[qb]
 ;W[rc]LB[od:B][rd:A]C['a': White lives.
 'b': ko.]
 (;B[rd]
 ;W[pb]
 ;B[oc]
 ;W[rb]
 ;B[pe]LB[qa:A][dp:B]C['a' is necessary. If tenuki, 'b', and White dies.]
 (;W[qa])
 (;W[dp]
 ;B[qa]
 ;W[ra]
 ;B[sc]))
 (;B[od]LB[rd:B][pe:A]C['a': ko for the corner.
 'b': White connects few stones in sente.]
 (;W[pe]
 ;B[rd]
 ;W[pb]
 ;B[ob]
 ;W[oc])
 (;W[rd]
 ;B[pe])))
 (;B[od]LB[rd:A][pe:B]C['a' is correct, Black gets overconcentrated.
 'b' is bad, White loses the corner.
+]
 (;W[rd]
 ;B[pe]
 ;W[rb]
 ;B[qb]
 ;W[rc])
 (;W[pe]
 ;B[rc]
 ;W[qb]
 ;B[re]
 ;W[pb]
 ;B[oc]
 ;W[rb]
 ;B[rf]
 ;W[qg]
 ;B[sb]))
 (;B[pb]
 ;W[rd]
 ;B[qe]
 ;W[pe]
 ;B[re]
 ;W[rf]))
 (;W[qb]
 ;B[rd]LB[pb:B][pd:A]C['a' or 'b' don't help.]
 (;W[pd]
 ;B[pb]
 ;W[qe]
 ;B[od]
 ;W[pe]
 ;B[rb]
 ;W[re]
 ;B[rc])
 (;W[pb]LB[ob:B][oc:A]C['a' is correct. 'b' is a mistake without the ladder, and unnecessary with it.]
 (;B[oc]
 ;W[rc]
 ;B[ra]
 ;W[ob]
 ;B[nb]
 ;W[qa]
 ;B[oa])
 (;B[ob]
 ;W[pd]
 ;B[oc]
 ;W[qe]
 ;B[rc]
 ;W[rb]
 ;B[sb]
 ;W[re]
 ;B[pe]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[md])))
 (;W[rd]
 ;B[rc]
 ;W[qb]LB[rb:A][re:B]TR[pj]C['a' is correct. 'b' is possible with an additional Black stone on or near the triangled point.]
 (;B[rb]
 ;W[pd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[pf]
 ;B[od])
 (;AB[pj]
 ;B[re]
 ;W[pd]
 ;B[qe]
 ;W[oc]
 ;B[od]
 ;W[pb]
 ;B[oe]LB[nb:A][pf:B]C['a' is correct. 'b' is a mistake.]
 (;W[nb]
 ;B[pf])
 (;W[pf]
 ;B[pe]
 ;W[ph]
 ;B[ob]
 ;W[pc]
 ;B[nb]
 ;W[rb]
 ;B[sd]))))
 (;B[rd]
 ;W[oc]LB[od:A][pd:B]C['a' or 'b' don't give Black a strong position.
+]
 (;B[od]
 ;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[qe]
 ;W[nd]
 ;B[oe]
 ;W[mc]
 ;B[nb]
 ;W[mb])
 (;B[pd]
 ;W[od]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[nb]))
 (;B[rc]LB[pc:B][pd:A]C['a' is correct. 'b' gives Black too much outside strength.
+]
 (;W[pd]
 ;B[pc]
 ;W[qb]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[pb]
 ;B[pe]LB[pc:A][qe:B]C[Black lives on 'a', or starts an almighty ko on 'b' if he has more decisive ko-threats.
+]
 (;W[pc]
 ;B[qe]
 ;W[nd]
 ;B[oe]
 ;W[mc])
 (;W[qe]
 ;B[pc]))
 (;W[pc]
 ;B[pd]
 ;W[rb]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nb]
 ;B[mb]
 ;W[na]
 ;B[mc]LB[ra:B][sb:A]C[White lives on 'a', or Black starts a ko for life on 'b'.
+]
 (;W[sb])
 (;B[ra]
 ;W[sb]
 ;B[pa]
 ;W[pb]
 ;B[ma]
 ;W[ob]
 ;B[qb])))
 (;B[qe]
 ;W[pc]
 ;B[od]
 ;W[rb]
 ;B[rd]
 ;W[qa]LB[pd:B][pf:A]C[White lives easily. Later, White has the aji of 'a' and of 'b'.
 ]))
 (;AW[lc]
 ;W[pc]LB[qc:A][pd:B]TR[lc]C[This invasion is possible only with the triangled helping stone.
 'a' or 'b'.]
 (;B[qc]
 ;W[oc]LB[nd:B][oe:A]C['a' is correct. 'b' is questionable.
+]
 (;B[oe]
 ;W[nd])
 (;B[nd]
 ;W[nb]
 ;B[mb]
 ;W[pe]
 ;B[pd]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[md]
 ;B[mc]
 ;W[lb]))
 (;B[pd]
 ;W[oc]
 ;B[od]
 ;W[nb]
 ;B[nd]
 ;W[ob]))
 (;B[pd])
 (;B[od])
 (;B[oe])
 (;B[ne])
 (;B[qe]))
 (;B[nd]LB[oc:A][qc:B]C[
 Nikken-Tobi Shimari
 ----------------------
 'a' or 'b' are ok.
+]
 (;W[oc]LB[nc:A][od:B]C['a' or 'b' are ok.]
 (;B[nc]
 ;W[qc]LB[rc:A][pd:B]C['a' or 'b' are ok.]
 (;B[rc]
 ;W[pd])
 (;B[pd]
 ;W[pc]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]))
 (;B[od]
 ;W[qc]LB[pc:B][rc:A]C['a' is more powerful than 'b'.]
 (;B[rc]LB[pd:A][rd:B]C['a' is ok. 'b' is questionable.]
 (;W[pd]
 ;B[pe]
 ;W[pc]
 ;B[rd]
 ;W[mb])
 (;W[rd]
 ;B[pc]
 ;W[qb]
 ;B[rb]))
 (;B[pc]
 ;W[pb]
 ;B[pd]
 ;W[rb])))
 (;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[qe]LB[qb:B][re:A]C[White lives with 'a' or 'b'.]
 (;W[re]
 ;B[rf]
 ;W[qb]
 ;B[se]
 ;W[sc]
 ;B[sf]
 ;W[ra]
 ;B[pb]
 ;W[sb])
 (;W[qb]
 ;B[re]
 ;W[sc]
 ;B[se]
 ;W[ra]
 ;B[pb]
 ;W[sb]))))
 (;W[qj]LB[oc:A][ql:B]C[White 2 shows a special strategy.
 'a': Black has a shimari.
 'b': Black plays the Mini-Chinese Fuseki.]
 (;B[oc]
 ;W[mc]
 ;B[qh]
 ;W[qf]
 ;B[pg]
 ;W[pe]
 ;B[nd]
 ;W[pd]
 ;B[pc]
 ;W[of]
 ;B[md])
 (;AB[kc]
 ;B[qm]
 ;W[qg]LB[pf:A][pi:B]C['a' or 'b'.]
 (;B[pf]LB[re:A][pg:B]C['a' is correct. 'b' is a mistake.]
 (;W[re]LB[qe:C][rf:B][pg:A]C['a' is for influence, 'b' is for territory, 'c' is slightly disadvantageous.]
 (;B[pg]
 ;W[qe]
 ;B[pe]
 ;W[qh]
 ;B[pd])
 (;B[rf]
 ;W[qf]
 ;B[qe]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[md]
 ;W[ne])
 (;B[qe]
 ;W[rd]
 ;B[rc]
 ;W[qf]
 ;B[pc]
 ;W[qb]
 ;B[qc]
 ;W[oh]LB[qb:12]C[White 12 still has some aji.]))
 (;W[pg]
 ;B[of]))
 (;B[pi]LB[qc:C][qi:A][pj:B]C['a' is correct.
 'b' and 'c' are disadvantageous.]
 (;W[qi]LB[pf:A][pg:B]C['a' or 'b'.]
 (;B[pf]LB[re:B][pg:C][ph:A]C['a' is correct, 'b' is disadvantageous, 'c' is a mistake.]
 (;W[ph]LB[qf:B][oh:A]C['a' is for influence, 'b' for territory.]
 (;B[oh]
 ;W[oi]
 ;B[ni]LB[og:B][pj:A]C['a' is correct. 'b' is a mistake.]
 (;W[pj]
 ;B[og])
 (;W[og]
 ;B[oj]
 ;W[nh]LB[ng:B][mh:A][oi:C]C['a' is correct, 'b' is possible, 'c' a mistake.]
 (;B[mh]
 ;W[oi]
 ;B[as]C[In the Mini-Chinese Fuseki, Black has exactly one ko-threat.]
 ;W[bs]
 ;B[oh]
 ;W[pg]
 ;B[ng]
 ;W[of]
 ;B[od])
 (;B[ng]
 ;W[oi]
 ;B[as]
 ;W[bs]
 ;B[oh]
 ;W[mh]
 ;B[oi]
 ;W[pg]
 ;B[of]
 ;W[nf]
 ;B[mg]
 ;W[qf]
 ;B[od]
 ;W[lh]
 ;B[mf]C[Making two ponnuki in the center will be a better preparation for fighting later in the game than making the plump bowl shape just for cutting and taking about five to ten points more territory on top.])
 (;B[oi]
 ;W[pg]
 ;B[ng]
 ;W[of]
 ;B[mh]
 ;W[od])))
 (;B[qf]
 ;W[nh]
 ;B[le]))
 (;W[re]
 ;B[pg]
 ;W[qe]
 ;B[pe]
 ;W[qh]
 ;B[pd])
 (;W[pg]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[ng]
 ;B[mf]))
 (;B[pg]LB[qc:D][ld:E][qe:B][pf:C][qf:A]C['a' is correct. 'b', 'c', 'd' and 'e' are disadvantageous.]
 (;W[qf]
 ;B[pf]LB[pe:B][qe:A]C['a' is correct, 'b' is disadvantageous.]
 (;W[qe]
 ;B[pe]
 ;W[pd]
 ;B[qc]
 ;W[pc]
 ;B[pb]
 ;W[ob]
 ;B[qb]LB[ld:A][nd:B]C['a' or 'b'.]
 (;W[ld]
 ;B[nd]
 ;W[lc]
 ;B[kd]
 ;W[le]
 ;B[oc]
 ;W[ke]
 ;B[id]
 ;W[je]
 ;B[hd])
 (;W[nd]
 ;B[qh]
 ;W[rh]
 ;B[ph]
 ;W[pj]
 ;B[ld]
 ;W[me]
 ;B[oj]
 ;W[ok]
 ;B[ni]))
 (;W[pe]
 ;B[qe]
 ;W[pd]
 ;B[pc]
 ;W[oc]
 ;B[qc]
 ;W[nd]
 ;B[qh]
 ;W[rh]
 ;B[ph]
 ;W[re]
 ;B[oe]
 ;W[od]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[pj]
 ;B[me]))
 (;W[qe]
 ;B[pe]
 ;W[pf]
 ;B[of]
 ;W[qf]
 ;B[pd]
 ;W[ph]
 ;B[og]
 ;W[oh]
 ;B[nh])
 (;W[pf]
 ;B[qf]
 ;W[qh]
 ;B[rf]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[oi])
 (;W[qc]
 ;B[qf]
 ;W[ph]
 ;B[oh]
 ;W[qh]
 ;B[pf]LB[pc:A][pd:B]C['a' or 'b'.]
 (;W[pc]
 ;B[nc])
 (;W[pd]
 ;B[pc]LB[oc:B][rd:A]C['a' is less unfavorable than 'b'.]
 (;W[rd]
 ;B[qe]
 ;W[pb]
 ;B[oc]
 ;W[ob]
 ;B[rc]
 ;W[qb]
 ;B[nc]
 ;W[rb])
 (;W[oc]
 ;B[pb]
 ;W[qe]
 ;B[rd]
 ;W[re]
 ;B[rf])))
 (;W[ld]
 ;B[qf]
 ;W[qh]
 ;B[kd]
 ;W[pf]
 ;B[rf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[oi]LB[nf:A][pk:B]C['a' and 'b' are miai.]
 (;W[nf]
 ;B[pk])
 (;W[pk]
 ;B[nf]))))
 (;W[pj]LB[pf:A][ni:B][qi:C]C['a', 'b' or 'c' give Black a superior position.]
 (;B[pf]LB[re:B][pg:A]C[Both 'a' or 'b' don't disable a position which is favorable for Black.]
 (;W[pg]
 ;B[og]
 ;W[oh]LB[ng:B][oi:A]C['a' is recommended, 'b' is possible.]
 (;B[oi]LB[of:B][nh:A]C['a' brings a fight that is good for Black. 'b' gives Black overwhelming thickness.]
 (;W[nh]
 ;B[ph]
 ;W[of]
 ;B[ng]
 ;W[rh]
 ;B[qf]
 ;W[rf]
 ;B[oe]
 ;W[mh]
 ;B[oj])
 (;W[of]
 ;B[ng]
 ;W[pe]
 ;B[qf]
 ;W[qe]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[nf]
 ;B[ph]
 ;W[mg]
 ;B[nh]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[mf]
 ;W[me]
 ;B[lf]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[kd]
 ;W[lb]
 ;B[jf]))
 (;B[ng]
 ;W[qf]
 ;B[pe]
 ;W[oi]
 ;W[qc]C[Later, White can use this aji.]
 ;B[pc]
 ;W[rc]LB[pb:A][rd:B]C['a' loses less than 'b'.]
 (;B[pb]
 ;W[rd]
 ;B[qe]
 ;W[re])
 (;B[rd]
 ;W[pb]
 ;B[oc]
 ;W[rb]
 ;B[qa]C[Black can't kill.]
 ;W[ra])))
 (;W[re]
 ;B[pg]
 ;W[qe]
 ;B[pe]
 ;W[qh]
 ;B[pd]LB[ph:A][dp:B]C['a' is necessary. Tenuki or 'b' is a mistake.]
 (;W[ph]
 ;B[oh]
 ;W[oi]
 ;B[ni]
 ;W[oj]
 ;B[nh])
 (;W[dp]
 ;B[qf]
 ;W[rf]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[rh]
 ;B[rk]
 ;W[ph]
 ;B[oi]
 ;W[oh]
 ;B[oj])))
 (;B[ni]
 ;W[oj]
 ;B[pf]
 ;W[re]
 ;B[rd]
 ;W[qe]
 ;B[pd]
 ;W[oi]
 ;W[pe]C[Later.]
 ;B[od])
 (;B[qi]
 ;W[oi]
 ;B[rj]
 ;W[oh]LB[rh:B][oj:A]C['a' is correct. 'b' is disadvantageous.]
 (;B[oj]
 ;W[qe]LB[pe:B][nj:A]C['a' is correct. 'b' is a mistake.]
 (;B[nj]
 ;W[pd]
 ;B[qc]
 ;W[pc]
 ;B[re]
 ;W[rf]
 ;B[pe]
 ;W[qf]
 ;B[pb]
 ;W[ob]
 ;B[qb]
 ;W[nd]
 ;B[id])
 (;B[pe]
 ;W[rk]
 ;B[rh]
 ;W[sj]
 ;B[ri]
 ;W[qk]
 ;B[rg]
 ;W[rf]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[ph]
 ;B[qh]
 ;W[rd]
 ;B[sf]
 ;W[re]
 ;B[qc]
 ;W[si]))
 (;B[rh]
 ;W[od]
 ;B[oj]
 ;W[nj]
 ;B[ok]
 ;W[nk]
 ;B[ol]
 ;W[qc])))
 (;W[qc]LB[pc:A][pd:B]C['a' is correct. 'b' is also possible.]
 (;B[pc]
 ;W[pd]
 ;B[qe]
 ;W[oc]
 ;B[pb]
 ;W[rc]
 ;B[ob]
 ;W[pe]
 ;B[pf]LB[nc:A][nd:B]C['a' gives Black more territory, 'b' superior influence.]
 (;W[nc]
 ;B[qf]
 ;W[nb]
 ;B[ne]
 ;W[od]
 ;B[qi])
 (;W[nd]
 ;B[qf]
 ;W[nb]
 ;B[mc]
 ;W[nc]
 ;B[mb]
 ;W[qb]
 ;B[me]
 ;W[ne]
 ;B[nf]
 ;W[pa]
 ;B[oe]
 ;W[od]
 ;B[of]
 ;W[pj]
 ;B[md]
 ;W[oa]
 ;B[nj]))
 (;B[pd]
 ;W[pc]LB[oc:B][od:A]C['a' is correct. 'b' is a mistake.]
 (;B[od]
 ;W[qi]
 ;B[oc]
 ;W[ph]
 ;B[re])
 (;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[od]
 ;B[nc]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[qf]
 ;B[sb]
 ;W[qb]
 ;B[nd]
 ;W[oe]
 ;B[pa]
 ;W[se]
 ;B[rf]
 ;W[rg]
 ;B[pb]
 ;W[re]
 ;B[ra]
 ;W[pj]))))))
 (;W[pg]LB[od:a][pf:c][pi:d][pj:b]C[White 2 represents a special strategy when Black has a Chinese-style fuseki at top.
 Black continues with 'a', 'b', 'c' or 'd'.]
 (;B[od]
 ;W[pj])
 (;B[pj]LB[od:A][pd:D][oe:C][oi:B]TR[kc]C['a', 'b' or 'c'. If the triangled Black stone is high, 'd' is possible.]
 (;W[od]
 ;B[oe]
 ;W[ne]
 ;B[pe]
 ;W[nf]
 ;B[nd]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[oc]
 ;W[lf])
 (;W[oi]LB[od:A][oj:B]C['a' or 'b' are both good.]
 (;B[od]
 ;W[oj])
 (;B[oj]
 ;W[od]
 ;B[oe]
 ;W[pe]
 ;B[pd]
 ;W[oc]LB[ne:C][of:A][pf:B]C['a' is correct. 'b' and 'c' are disadvantageous.]
 (;B[of]
 ;W[qe]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[ob]
 ;B[pf]
 ;W[qf]
 ;B[qg]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[og]
 ;W[rb]
 ;B[nd])
 (;B[pf]
 ;W[of]
 ;B[qe]
 ;W[ne])
 (;B[ne]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[pi]
 ;B[pc]
 ;W[qj]
 ;B[qk]
 ;W[rk])))
 (;W[oe]
 ;B[oc]LB[pm:B][qm:A]C['a' or 'b'.]
 (;W[qm]
 ;B[ni]
 ;W[mf]
 ;B[ng]
 ;W[md]
 ;B[re]
 ;W[ke]
 ;B[mc]
 ;W[ld]
 ;B[lc]
 ;W[pd]
 ;B[pc]
 ;W[lh]
 ;B[lj])
 (;W[pm]
 ;B[mj]
 ;W[mh]
 ;B[pl]
 ;W[ql]
 ;B[ol]
 ;W[qk]
 ;B[qj]))
 (;AB[kd]
 ;W[pd]LB[pc:B][pe:A]C['a' or 'b' are both possible.]
 (;B[pe]
 ;W[qc]
 ;B[qe]
 ;W[pc]
 ;B[ne]
 ;W[nc])
 (;B[pc]
 ;W[qc]
 ;B[oc]
 ;W[rb]LB[rd:B][qe:A]C['a' leads to fight, 'b' to a solidified position which is a little better for White.]
 (;B[qe]
 ;W[pe]
 ;B[qf]
 ;W[nd]LB[mb:A][nc:B]C['a' is correct. 'b' is a mistake.]
 (;B[mb]
 ;W[pf]
 ;B[rh])
 (;B[nc]
 ;W[pf]
 ;B[rh]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]))
 (;B[rd]
 ;W[od]
 ;B[nc]
 ;W[nd]
 ;B[mc]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[rc]
 ;W[qb]
 ;B[rf]
 ;W[rg]
 ;B[sb]
 ;W[pm]
 ;B[nj]
 ;W[mg]C[End of joseki.]
 ;W[sc]C[Aji for a two-step-two-stage-ko in the corner.]
 ;B[sd]
 ;W[sa]
 ;B[ra]
 ;W[qa]))))
 (;B[pf]
 ;W[of]
 ;B[pe]
 ;W[og]
 ;B[nd]
 ;W[pk]LB[qg:A]C['a' is a 15 points endgame sente move for Black.]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[sh]
 ;W[si]
 ;B[sg]
 ;W[ri])
 (;B[pi]
 ;W[qk]LB[od:D][pe:A][ri:C][oj:B]C['a' and 'b' are correct. 'c' and 'd' are mistakes.]
 (;B[pe]
 ;W[qi]LB[ph:C][qh:B][pj:A]C['a' is correct. 'b' and 'c' are mistakes.]
 (;B[pj]LB[qh:A][qj:B]C['a' is correct. 'b' is disadvantageous.]
 (;W[qh]
 ;B[og]LB[of:B][oh:A]C['a' is correct. 'b' is a mistake.]
 (;W[oh]LB[of:A][ph:B]C['a' is correct and easy. 'b' is unfavorable and complicated.]
 (;B[of]
 ;W[ph]
 ;B[nh]
 ;W[ni]
 ;B[mh]
 ;W[lj])
 (;B[ph]
 ;W[of]
 ;B[ng]
 ;W[pf]
 ;B[qj]
 ;W[rj]
 ;B[rk]LB[pk:A][rl:B]C['a' is correct. 'b' is a mistake.]
 (;W[pk]LB[ni:A][ri:B]C['a' is possible, 'b' is a mistake.]
 (;B[ni]
 ;W[ok]
 ;B[nj]
 ;W[ri]C[Still, White is happy.])
 (;B[ri]
 ;W[sj]
 ;B[si]
 ;W[oj]
 ;B[sk]
 ;W[rj]
 ;B[sj]
 ;W[oi]
 ;B[rj]
 ;W[ok]))
 (;W[rl]
 ;B[qg]
 ;W[sk]
 ;B[qf])))
 (;W[of]
 ;B[pf]
 ;W[oh]
 ;B[ng]
 ;W[ph]
 ;B[nh]))
 (;W[qj]
 ;B[ph]
 ;W[qg]
 ;B[og]
 ;W[ke]
 ;B[ol]
 ;W[qn]
 ;B[of]))
 (;B[qh]
 ;W[ph]
 ;B[qg]
 ;W[qf]
 ;B[rf]
 ;W[pf]
 ;B[qe]
 ;W[oi]
 ;B[pj]
 ;W[qj]
 ;B[oj]
 ;W[oe])
 (;B[ph]
 ;W[qh]
 ;B[og]
 ;W[qg]
 ;B[pj]
 ;W[of]
 ;B[pf]
 ;W[ng]
 ;B[oh]
 ;W[nf]
 ;B[nd]
 ;W[mi]))
 (;B[oj]
 ;W[pd]LB[pc:A][pe:B]C['a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[oc]
 ;B[qc]LB[od:A][pe:B]C['a' is correct, 'b' is a little disadavantageous.]
 (;W[od]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[ke]
 ;B[qj]
 ;W[jc]
 ;B[jb]
 ;W[jd]
 ;B[ic]
 ;W[kb]
 ;B[ib]
 ;W[lc]
 ;B[fc])
 (;W[pe]LB[ob:B][nc:A]C['a' is correct, 'b' is submissive.]
 (;B[nc]
 ;W[ob]
 ;B[od]
 ;W[nd]
 ;B[oe]
 ;W[ne]
 ;B[of]
 ;W[pf]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[ph]
 ;B[nb]
 ;W[mh]
 ;B[mg]
 ;W[lg]
 ;B[nh]
 ;W[ni]
 ;B[mi]
 ;W[lh]
 ;B[oi]
 ;W[nj]
 ;B[pb]
 ;W[qi]
 ;B[ok]
 ;W[nk]
 ;B[nl]
 ;W[lj]
 ;B[ol]
 ;W[rf]
 ;B[ql]
 ;W[rk]
 ;B[ll])
 (;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[ke]
 ;W[mg])))
 (;B[pe]
 ;W[qc]
 ;B[qe]
 ;W[pc]
 ;B[ne]
 ;W[nc]))
 (;B[ri]
 ;W[nh]
 ;B[oj]
 ;W[od])
 (;B[od]
 ;W[pc]
 ;B[pd]
 ;W[qi]
 ;B[qh]
 ;W[ph]
 ;B[qg]
 ;W[qf]
 ;B[rf]
 ;W[ri]
 ;B[pf]
 ;W[rg]
 ;B[qe]
 ;W[rh]
 ;B[qf]
 ;W[pj]
 ;B[oi]
 ;W[nj]LB[rb:B][mc:A][pc:6]C[If White has a stone in the lower right corner, White is happy, because he still can activate White 6.
 For doing so, he might aim at 'a' to go outside or to the upper left, or at 'b' to threaten a living tapsi group.])))
 (;W[qf]C[Usual against the Chinese Opening.]
 ;AW[dp][pp]AB[kc][dd]LB[od:A][qh:B]C['a' is correct.
 'b' is possible, but disadvantageous in the context of this fuseki.]
 (;B[od]
 ;W[qi])
 (;B[qh]LB[qc:A][of:B]C['a' is correct, 'b' is questionable.]
 (;W[qc]LB[pc:A][pd:B]C['a' or 'b'.]
 (;B[pc]
 ;W[pd]
 ;B[rc]
 ;W[qb]
 ;B[pe]
 ;W[od]
 ;B[qe]
 ;W[rb]
 ;B[ne]
 ;W[oe]
 ;B[of]
 ;W[oc]
 ;B[pf])
 (;B[pd]
 ;W[pc]
 ;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]))
 (;W[of]
 ;B[od]
 ;W[oh]
 ;B[pj]
 ;W[mf]
 ;B[md])))
 (;W[qc]LB[pc:A][pd:B]C['a' is correct, 'b' is inferior.]
 (;B[pc]LB[pd:A][rd:B]C['a' is ususal, 'b' is not recommended.]
 (;W[pd]LB[pb:B][oc:A]C['a' is correct, 'b' not recommended.]
 (;B[oc]
 ;W[rd]
 ;B[qe]LB[qb:B][re:A]C['a' is correct, 'b' also makes life.]
 (;W[re]LB[qb:B][rc:C][qf:A]C['a' is correct to enclose White, 'b' and 'c' keep the corner.]
 (;B[qf]
 ;W[qb]
 ;B[rf]
 ;W[sc])
 (;B[qb]
 ;W[qf]
 ;B[rc]
 ;W[pe]
 ;B[qc]
 ;W[pg]
 ;B[of]
 ;W[pf])
 (;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[qf]
 ;B[pe]LB[of:B][pf:A]C['a' or 'b'.]
 (;W[pf]
 ;B[oe]
 ;W[pj])
 (;W[of]
 ;B[oe]
 ;W[ne]
 ;B[pf]
 ;W[pg]
 ;B[od]
 ;W[og]
 ;B[qg]
 ;W[qh]
 ;B[rf]
 ;W[rg]
 ;B[qf]
 ;W[pi])))
 (;W[qb]
 ;B[re]
 ;W[sc]LB[pb:A][se:B]C['a' is correct. 'b' is disadvantageous.]
 (;B[pb]
 ;W[rb]
 ;B[se]
 ;W[sd])
 (;B[se]
 ;W[pb]LB[ra:B][ob:A]C['a' is correct. 'b' wrong.]
 (;B[ob]
 ;W[ra]
 ;B[pa]
 ;W[sb])
 (;B[ra]
 ;W[ob]
 ;B[nc]LB[nb:A][rb:B]C[If pushing on 'a' isn't helpful due to additional stones not shown, White lives on 'b'.]
 (;W[nb]
 ;B[mc])
 (;W[rb]
 ;B[sd]
 ;W[qa]
 ;B[nb]
 ;W[oa]
 ;B[rc]
 ;W[sb])))))
 (;B[pb]
 ;W[qe]
 ;B[rd]
 ;W[re]
 ;B[rc]
 ;W[od]))
 (;W[rd]LB[qb:A][rc:B]C['a' encloses a small group. 'b' starts a ko.]
 (;B[qb]
 ;W[rc]
 ;B[qe]
 ;W[rb]
 ;B[pb]
 ;W[re]
 ;B[qf]
 ;W[ra]
 ;B[rf]
 ;W[se])
 (;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[pd]
 ;B[qe]
 ;W[pb]
 ;B[oc]
 ;W[re]
 ;B[qf]
 ;W[ob]
 ;B[nc]LB[ra:A][sb:B]C['a' is correct, 'b' disadvantageous.]
 (;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[se]
 ;B[rf]
 ;W[sc])
 (;W[sb]
 ;B[sc]
 ;W[ra]
 ;B[sa]))))
 (;B[pd]LB[pd:3][qd:1]C[Same variation as Black 3 played before Black 1.])))
 (;B[pd]LB[qc:f][qd:h][rd:k][re:l][pf:b][qf:a][pg:c][qg:d][qh:i][qi:g][qj:j][dp:e]C[
 Star Point = Hoshi = Hwajeom, Seongjeom = Xingwei`
 ---------------------------------------------------------
 The star or hoshi (4-4) point, emphasizing influence at the potential expense of territory.
 The first experiments with the star point were around 1840 in Japan; its first appearances in pro games date to the early 1900's.
 Its rise to preeminence came during the 'New Fuseki' movement in Japan in the mid-1930's.
 White approaches with 'a', 'b', 'c' or 'd'. White 'a' is the standard approach move. The variations after it cover the great majority of hoshi joseki. Other approaches invite a local loss, but may make sense strategically.
 'e' covers White playing elsewhere. These variations show White approaches when there are multiple Black stones locally.
 'f' shows the too early sansan invasion (which is not joseki).
 'g' shows a splitting move (esp. when Black has already played at the top).
 'h' is feasible if strategically sensible.
 'i' is a move on the side preparing to approach from the other side.
 'j', 'k' and 'l' are covered in another branching.
 g7, f6, e5, d4, c3, b2, a1
+]
 (;W[qf]LB[mc:c][nc:b][qc:q][jd:n][nd:a][oe:k][qe:s][re:p][of:l][pf:d][rf:r][pg:m][ph:h][qh:e][pi:i][qi:f][pj:j][qj:g][dp:o]TR[pq]C[
 -Space Low Approach = Ikken Kakari = Hankan Keolch'im = Yi Gua`jiao~
 ----------------------------------------------------------------------
 White 2 is the standard approach move to the 4-4.
 Black joseki responses range from 'a', 'b', 'c', 'd', 'e', 'g', 'h', 'i', 'm' or 'n'.
 The variations after 'a' and 'b' should be studied together to understand similarities and differences.
 'c' leads to much more complications than the other answers, but White can simplify.
 'd' is called Tsuke-Nobi-Joseki. Its shape also occurs on the side without corner. Kyu and low dan players should totally avoid playing this variation, regard it as bad move and instead play an extension (a - c) or a pincer.
 Black needs the ladder for 'e'. An additional stone on  n  is also very helpful.
 'f' is not generally favorable for Black, nor joseki. 'f' is better than 'i', if there's a Black stone on the triangled point.
 'j', 'k' and 'l' show special strategies based upon the fuseki.
 'o' shows Black ignoring the approach move (White 2) and invasion into different extensions and moyos based on the Hoshi.
 'p' shows the greedy play of using the star point immediately for territory.
 'q' is possible if White is not on the top side.
 'r' is a trick play.
 's' is covered in two other branches.
 o15, n14, m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2,
 a1
+]
 (;B[nd]LB[nb:h][ob:i][pb:j][lc:f][qc:d][ld:k][md:m][qd:e][rd:a][pi:n][qi:l][pj:c][qj:b][dp:g]TR[jc]C[
 Ikken-Tobi (1-space jump)
 ----------------------------
 White responses range from 'a' to 'f' or 'l' or 'n'.
 White may also play elsewhere ('g').
 If White already has a stone on the triangled point, he may slide to 'h', 'i' or 'j'.
 'k' and 'm' are invasions.
 'n' can be more preferable than 'c' in six stone handicap games.
 g7, f6, e5, d4, c3, b2, a1
+]
 (;W[rd]LB[jc:d][qc:a][pg:e][qg:c][qh:b]C[Black continues with 'a' to 'c'. For a good result, Black must have the ladder to play 'c'.
 Black 'd' is hasty. 'e' is also possible.]
 (;B[qc]LB[qi:a][qj:c][dp:b]C[White continues with 'a'.
 Playing elsewhere ('b') is a mistake.
 A White play at 'c' is too far.]
 (;W[qi]LB[jc:a][dp:b]C[Black continues with 'a'. If Black plays elsewhere, White has a strong followup.]
 (;B[jc])
 (;B[]C[Black plays elsewhere.]
 ;W[lc]
 ;B[rc]C[Black plays 9 to establish a base.]))
 (;W[dp]C[White plays elsewhere, a mistake.]
 ;B[qh]
 ;W[of]
 ;B[oh]
 ;W[mf]
 ;B[ld]C[If White is going to play elsewhere, it is better not to have played White 4.])
 (;W[qj]C[White overextends with 6.]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[pg]
 ;B[rf]
 ;W[qe]
 ;B[pf]C[Black 17 catches the three White corner stones.]))
 (;B[qh]LB[qc:a][qg:b]C[Black 5 emphasizes the right side at the expense of losing the better part of the corner.
 White continues with 'a' or 'b'.]
 (;W[qc]
 ;B[qe]LB[pe:b][re:a]C[Black continues with 'a' or 'b'. White must have the ladder to play 'b'.]
 (;W[re]
 ;B[pf]LB[nb:a][pg:b][qg:c]C[White continues with 'a' or 'b'. White must have the ladder to play 'b'. White 'c' is a mistake.]
 (;W[nb]
 ;B[rf]
 ;W[oc])
 (;W[pg]LB[rf:b][qg:a]C[Black continues with 'a' or 'b', regardless of the ladder.]
 (;B[qg]
 ;W[rf]C[White must have the ladder. Black being able to catch White 10 in a ladder gives Black a significant advantage.]
 ;B[of]C[Black extends if the ladder is unfavorable. The presence of the cutting stone gives White a better result than the other variation.])
 (;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[og]LB[of:a]C[White 14 is correct. The atari at 'a' is vulgar, as it destroys aji.]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[pi]))
 (;W[qg]C[White 10 is a mistake, as Black gets powerful thickness.]
 ;B[pg]
 ;W[rh]
 ;B[ri]
 ;W[rg]
 ;B[qi]))
 (;W[pe]C[White must have the ladder to play 8 this way.]
 ;B[pf]
 ;W[oe]
 ;B[qd]
 ;W[od]
 ;B[pc]
 ;W[oc]
 ;B[pb]
 ;W[pg]
 ;B[rf]
 ;W[of]
 ;B[re]))
 (;W[qg]
 ;B[ph]
 ;W[qc]
 ;B[og]))
 (;B[qg]LB[pg:a][rg:b]C[Black 5 is a recent Korean innovation. Black must have the ladder to the lower left corner to play this way.
 White continues with 'a'. White 'b' is possible only with the
 ladder.]
 (;W[pg]LB[qe:B][pf:C][qh:A]C['a' is correct, 'b' and 'c' are wrong.
+]
 (;B[qh]LB[qc:b][rf:a][ph:c]C[After White 'a' Black gets the corner and White will aim at attacking the right side group. White 'b' grabs the corner in exchange for black thickness. White 'c' also aims at the right side, but creates more eye shape.]
 (;W[rf]
 ;B[qc]
 ;W[ph]
 ;B[qi]
 ;W[pi]
 ;B[qj]
 ;W[oc]
 ;B[od]
 ;W[of]LB[nc:b][pe:a]C[White 14 is the right timing. If White played it after 16, Black would respond by peeping at 'a' and blocking at 'b'.])
 (;W[qc]LB[pf:a][rf:b]C[White goes for the corner.
 Black can play 'a' and build thickness, or 'b' if he is concerned about the top and wants to block in sente.]
 (;B[pf]
 ;W[rf]
 ;B[of]
 ;W[ob]C[The white slide to 12 is a little painful, but avoids bad aji
 in the corner.])
 (;B[rf]
 ;W[qe]
 ;B[pc]
 ;W[re]
 ;B[ph]
 ;W[of]
 ;B[ng]
 ;W[nf]
 ;B[kc]
 ;W[mg]
 ;B[ni]))
 (;W[ph]LB[rf:b][qi:a]C[Black can play 'a', or 'b' if he wants to preserve the option of cutting between 2 and 6.]
 (;B[qi]
 ;W[pe]LB[qc:a][qd:b]C[Black can play 'a', or 'b' if he wants to make it a bit more difficult for White to make eye shape.]
 (;B[qc]
 ;W[od]
 ;B[oc]
 ;W[oe]
 ;B[nc]
 ;W[qd])
 (;B[qd]
 ;W[od]
 ;B[oc]
 ;W[oe]LB[nc:a][pc:b]C[Black can play 'a' if he values the top, or 'b' when he wants to continue and deny White eye shape.]
 (;B[nc]
 ;W[rc]
 ;B[qb]
 ;W[rf])
 (;B[pc]
 ;W[re]
 ;B[rc]C[This is often seen in professional play and consistent with the original intention of Black 5: making life tough for White.])))
 (;B[rf]
 ;W[qe]LB[qi:B][qj:A]C['a' or 'b'.]
 (;B[qj]
 ;W[pi]
 ;B[rk]
 ;W[qc]
 ;B[pc]
 ;W[re])
 (;B[qi]
 ;W[qc]
 ;B[pc]
 ;W[re]
 ;B[pi]))))
 (;B[qe]
 ;W[re]
 ;B[pf]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[pe]
 ;W[qc])
 (;B[pf]LB[qe:A][qh:B]C['a' punishes, 'b' fails to do so.
+]
 (;W[qe]LB[of:B][qh:A]C['a' or 'b' don't help.
+]
 (;B[qh]
 ;W[pe]
 ;B[of]
 ;W[oe]
 ;B[nf]
 ;W[ne]
 ;B[mf]
 ;W[me])
 (;B[of]
 ;W[qh]))
 (;W[qh]
 ;B[qe]
 ;W[rg]
 ;B[re])))
 (;W[rg]C[The only way White gets a good result is if the ladder to the lower left corner favors White. Black should not have have played Black 5 if this is the case.]
 ;B[rf]LB[re:a][pg:c][qh:b]C[White 'a' is obvious, and yields White a disadvantageous low position, but is the best White can do.
 White 'b' also yields White a disadvantageous low position, but leaves a White stone in a ladder to the lower left, offering a ladder breaker at the cost of giving Black a strong ponnuki shape.
 White 'c' is unreasonable, unless White has a favorable ladder to the lower left corner. If that is the case, Black has made a big mistake in playing Black 5.]
 (;W[re]
 ;B[pf]
 ;W[sf]
 ;B[qh]LB[qc:a]C[Black is satisfied, as White has a low position, and Black's thickness is clearly superior.
 'a' remains a big middle-game (chubansen) point.])
 (;W[qh]
 ;B[pg]
 ;W[re]
 ;B[rh]
 ;W[sf]
 ;B[qi]C[This is good for Black: White is in a low position again. While White has a play for the ladder breaker to White 8, the resultant ponnuki shape gives Black incredible strength.]
 ;W[hp]C[White plays the ladder breaker.]
 ;B[ph]C[Black must take with 15. Black's thickness is impressive.])
 (;W[pg]C[White must have the ladder to play this way.]
 ;B[qh]
 ;W[rh]
 ;B[qe]
 ;W[pf]
 ;B[re]
 ;W[qi]LB[qc:A]C[Later White can live on 'a'.]
 ;W[qc]
 ;B[pc]
 ;W[rb]LB[pb:A][sc:B]C['a' is correct, 'b' doesn't kill.]
 (;B[pb]LB[sc:B][qd:A]C['a' is correct, gives life, 'b' wrong, ko.]
 (;W[qd]LB[qb:B][pe:A]C['a' or 'b' don't kill.]
 (;B[pe]
 ;W[sc])
 (;B[qb]
 ;W[pe]
 ;B[sd]
 ;W[rc]
 ;B[sc]
 ;W[sf]))
 (;W[sc]
 ;B[qb]
 ;W[qd]
 ;B[ra]
 ;W[pe]
 ;B[sb]))
 (;B[sc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[sd]
 ;W[sb]))))
 (;B[jc]C[Black 5 is not recommended, as it is premature, letting White settle himself too easily.]
 ;W[qc]
 ;B[pc]LB[qi:a]C[White no longer needs to play at 'a' to secure a base, so may play elsewhere.])
 (;B[pg]
 ;W[pf]
 ;B[qg]
 ;W[of]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[qc]
 ;W[qd]
 ;B[qb]
 ;W[nc]
 ;B[mc]
 ;W[mb]
 ;B[lb]LB[nb:A][md:B]C['a' is correct. 'b' a mistake.]
 (;W[nb]
 ;B[md]
 ;W[pb]
 ;B[ng]
 ;W[nf]
 ;B[mf])
 (;W[md]
 ;B[lc]
 ;W[ne]
 ;B[ob]
 ;W[nb]
 ;B[na]
 ;W[pb]
 ;B[pa]C[Ko]))
 (;B[rh]C[Rare joseki]
 ;W[qc]
 ;B[pc]
 ;W[qg]C[The result is equal.]))
 (;W[qj]LB[jc:A][qh:C][ql:B]C['a', 'b' or 'c'.]
 (;B[jc]LB[qc:a][md:b][qd:c][rd:d][qh:e]C[White continues with 'a' or 'b'. Black meanwhile would like to defend the corner at 'c' or 'd' prior to invading at 'e'.
 If Black invades at 'e' without defending the corner, White will dodge that invasion by invading the corner with 'a'.]
 (;W[qc]
 ;B[qd]
 ;W[rd]LB[pc:b][re:a]C[Black continues with 'a' or 'b'.]
 (;B[re]LB[rb:B][rc:A]C['a' or 'b'.]
 (;W[rc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[nc]LB[od:A][dp:B]C['a' is necessary, tenuki 'b' is bad.]
 (;W[od]
 ;B[oe]LB[pc:A][ne:C][dp:B]C['a' is necessary, tenuki 'b' is a mistake. 'c' is possible.]
 (;W[pc]
 ;B[ne]LB[pf:B][rf:A]C[Later, White has 'a' and 'b'.])
 (;W[dp]
 ;B[oa]
 ;W[pb]
 ;B[sd]
 ;W[ra]
 ;B[sb])
 (;W[ne]
 ;B[of]
 ;W[me]
 ;B[ld]
 ;W[pc]))
 (;W[dp]
 ;B[oa]
 ;W[pa]
 ;B[ra]
 ;W[pc]
 ;B[na]
 ;W[qb]
 ;B[qa]))
 (;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]))
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]))
 (;W[md]LB[mc:b][me:c][ne:a]C[Black continues with 'a' or 'b'. Black 'a' works best with Black has the top-left corner. Black plays 'b' when the top-left corner is White's.
 'c' is possible.]
 (;B[ne]C[Black plays 2 only when he has support in the top-right corner.]
 ;W[kd]
 ;B[jd]
 ;W[ke]
 ;B[je]
 ;W[kf]
 ;B[ig]
 ;W[kh]
 ;B[df])
 (;B[mc]C[With White in the top-right corner, Black 7 is correct.]
 ;W[lc]
 ;B[ld]
 ;W[me]LB[nc:c][le:a][ne:b]C[Black continues with 'a'. Black 'b' is a mistake. Push on the side of the cut is the rule.
 Black 'c' is cowardly.]
 (;B[le]
 ;W[nc]
 ;B[mb]LB[oc:b][mf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mf]
 ;B[nb]
 ;W[lf]
 ;B[je]C[Joseki ends.]
 ;W[jf]C[White 18 is a suggested local follow-up.])
 (;W[oc]C[White 14 is not recommended.]
 ;B[od]
 ;W[lb]
 ;B[mf]
 ;W[ne]
 ;B[nf]
 ;W[oe]
 ;B[pf]
 ;W[nb]
 ;B[pe]
 ;W[ma]
 ;B[mc]
 ;W[mb]
 ;B[qg]))
 (;B[ne]C[Black 11 is a mistake.]
 ;W[kd]
 ;B[le]
 ;W[mf]
 ;B[kc]
 ;W[lb]LB[nc:a][ke:b]C['a' and 'b' are miai. Black is in a losing situation.])
 (;B[nc]C[Black 11 is a mistake.]
 ;W[kd]
 ;B[lb]
 ;W[le]
 ;B[kb]))
 (;B[me]LB[nc:C][kd:B][ld:A]C['a', 'b' or 'c'.]
 (;W[ld]LB[nc:B][ne:A]C['a' or 'b'.]
 (;B[ne]
 ;W[le]
 ;B[je]
 ;W[lg]
 ;B[rd])
 (;B[nc]LB[mb:B][le:A]C['a' or 'b'.]
 (;W[le]
 ;B[lb])
 (;W[mb]
 ;B[je]
 ;W[le]
 ;B[mf]
 ;W[lf]
 ;B[mg])))
 (;W[kd]
 ;B[jd]
 ;W[ke]
 ;B[mc]
 ;W[kc]
 ;B[je]
 ;W[kf]
 ;B[jf]
 ;W[kg]
 ;B[rd])
 (;W[nc]
 ;B[ld]
 ;W[mc]
 ;B[oc]LB[le:A][ne:B]C['a' is correct. 'b' is a mistake.]
 (;W[le]
 ;B[ne]
 ;W[kd]
 ;B[lc]
 ;W[kc]
 ;B[lb]
 ;W[kb]
 ;B[nb])
 (;W[ne]
 ;B[od]
 ;W[kb]
 ;B[lc]
 ;W[le]
 ;B[mf]
 ;W[lb]
 ;B[ob])))))
 (;B[ql]LB[rd:A][ph:C][oj:B]C['a' and 'b' are correct, 'c' is a mistake.]
 (;W[rd]
 ;B[qh]
 ;W[qc]
 ;B[oh])
 (;W[oj]
 ;B[qh]
 ;W[pg]
 ;B[rd]
 ;W[ph])
 (;W[ph]
 ;B[qe]
 ;W[pf]))
 (;B[qh]LB[of:B][rh:A]C['a' is correct. 'b' is a mistake.]
 (;W[rh]
 ;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[pg]
 ;B[pf]
 ;W[rf]
 ;B[sh]LB[qd:B][sf:A]C['a' sacrifices for influence, 'b' takes the corner.]
 (;W[sf]
 ;B[sg]
 ;W[rj]
 ;B[qe]
 ;W[of]
 ;B[pe]LB[qc:A][sk:B]C[White has aji on 'a'. White 'b' is sente.])
 (;W[qd]
 ;B[pe]
 ;W[qc]
 ;B[rj]
 ;W[qk]
 ;B[rk]
 ;W[ql]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[qb]))
 (;W[of]LB[nd:5][pd:1][of:4][qf:2][qh:3][qj:6]C[See the given order of moves for the punishment.])))
 (;W[pj]LB[jc:A][jd:C][qh:B]C['a' is correct.
 'b' is good with six handicap stones.
 'c' is a handicap continuation for White.]
 (;B[jc]LB[lc:B][md:A]TR[hc]C[Black hopes to strengthen the corner, White to invade the corner.
 White can reduce on 'a', or, with an additional stone on the triangled position, invade on 'b'.
+]
 (;W[md]LB[mc:A][ne:B]
 (;B[mc]
 ;W[lc]
 ;B[ld]
 ;W[me]LB[nc:A][le:B]
 (;B[nc])
 (;B[le]
 ;W[nc]
 ;B[mb]LB[oc:C][od:B][mf:A]
 (;W[mf]
 ;B[nb]
 ;W[lf]
 ;B[je])
 (;W[od]
 ;B[ne]
 ;W[oe]
 ;B[mf]
 ;W[pc])
 (;W[oc]
 ;B[od]
 ;W[lb]
 ;B[mf]
 ;W[ne]
 ;B[nf]
 ;W[oe]
 ;B[pf]
 ;W[ma]
 ;B[pe]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[qg])))
 (;B[ne]LB[mc:B][kd:A]
 (;W[kd]
 ;B[jd]
 ;W[kf]
 ;B[je]
 ;W[mf]
 ;B[nf])
 (;W[mc]
 ;B[ke]
 ;W[pb]
 ;B[pc]
 ;W[ob]
 ;B[qb]
 ;W[kc]
 ;B[jd])))
 (;AW[hc]
 ;W[lc]LB[kd:B][ld:A]C['a' or 'b'are ok.
+]
 (;B[ld]LB[kc:B][mc:A]C['a' if White is strong in the upper left, else 'b'.
+]
 (;W[mc]
 ;B[md]
 ;W[kc]LB[jd:B][kd:A]C['a' is ok, 'b' is not recommended.
+]
 (;B[kd]
 ;W[jb]LB[nc:A][jd:B]C['a' or 'b'.
+]
 (;B[nc])
 (;B[jd]
 ;W[kb]))
 (;B[jd]
 ;W[kd]
 ;B[ke]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[pb]))
 (;W[kc]
 ;B[kd]
 ;W[jb]
 ;B[mc]))
 (;B[kd]LB[oc:A][ld:B]C['a' or 'b' are ok.
+]
 (;W[oc]LB[nc:A][od:B]C['a' or 'b' are ok.
+]
 (;B[nc]
 ;W[od]
 ;B[oe]
 ;W[pc]
 ;B[qd]
 ;W[qc]
 ;B[pe]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc])
 (;B[od]
 ;W[pc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]))
 (;W[ld]
 ;B[le]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[nb]
 ;B[ob]
 ;W[mb]LB[la:B][oc:A]C['a' or 'b' don't kill.
+]
 (;B[oc]
 ;W[la])
 (;B[la]
 ;W[oc]
 ;B[pb]
 ;W[nc]
 ;B[md]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[me]
 ;W[pe]
 ;B[of]
 ;W[pc]
 ;B[qd]
 ;W[qb])))))
 (;AW[qn]AB[np][pp]
 ;B[qh]LB[pg:B][ph:A]C['a' or 'b' are ok.]
 (;W[ph]LB[pg:B][pi:A]C['a' is correct. 'b' is a mistake.]
 (;B[pi]LB[oi:A][qi:B]C['a' is correct. 'b' is a mistake.]
 (;W[oi]
 ;B[qi]
 ;W[pg]
 ;B[qj]
 ;W[pk]
 ;B[rl]
 ;W[pm]
 ;B[rg]
 ;W[rf]
 ;B[rd])
 (;W[qi]
 ;B[oi]
 ;W[rh]
 ;B[qj]
 ;W[qg]
 ;B[ri]
 ;W[qh]
 ;B[qk]))
 (;B[pg]
 ;W[qg]
 ;B[pi]
 ;W[oh]
 ;B[qj]
 ;W[oi]
 ;B[qi]
 ;W[pk]))
 (;W[pg]
 ;B[qj]
 ;W[pk]
 ;B[qk]
 ;W[pl]
 ;B[ph]
 ;W[oh]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[qe]
 ;B[ri]))
 (;B[jd]LB[lc:B][ld:A]C['a' or 'b' are later continuations.
+]
 (;W[ld]
 ;B[ke]
 ;W[le]
 ;B[lf]
 ;W[me]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[of]
 ;B[nf]
 ;W[pe]
 ;B[ne])
 (;W[lc]LB[jc:B][ld:A]C['a' or 'b'.]
 (;B[ld]
 ;W[mc]
 ;B[md]
 ;W[jc]
 ;B[ic]
 ;W[kc]
 ;B[id]
 ;W[pb])
 (;B[jc]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]))))
 (;W[qc]C[White invades. This is a special strategy, usually because of a pincer behind White 2.]
 ;B[qd]
 ;W[rd]LB[pc:B][re:A]C[Black builds a wall to the right on 'a' or defends territory on the top with 'b'.]
 (;B[re]LB[rb:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]
 ;B[qe]
 ;W[ob]LB[nb:b][mc:c][pf:a]TR[jd]C[Black continues with 'a', possibly 'b'. Black 'c is too mild.
 'b' is urgent if there is an additional Black stone on or near the triangled position.]
 (;B[pf]C[Black 11 is a thick move.])
 (;B[nb]LB[pb:B][oc:A]C['a' or 'b'.]
 (;W[oc]
 ;B[nc]LB[pc:B][od:A][dp:C]C['a' lives in gote, 'b' in sente.
 Tenuki 'c' is a mistake and leads to a ko.]
 (;W[od]
 ;B[oe]LB[pc:A][ne:B]C['a' leaves the cut at 'b' for later.
 Cutting immeadiately on 'b' makes the corner territory smaller.]
 (;W[pc])
 (;W[ne]LB[pc:A][of:B]C['a' is better than 'b'.]
 (;B[pc]
 ;W[pb]
 ;B[oa]
 ;W[qa]
 ;B[of]LB[rb:A][ne:16][dp:B]C['a' is necessary if the cut 16 should make sense.
 Tenuki 'b' loses 4 stones in gote.]
 (;W[rb])
 (;W[dp]
 ;B[na]
 ;W[sb]
 ;B[qb]
 ;W[rb]
 ;B[pa]
 ;W[sd]
 ;B[qb]
 ;W[pb]))
 (;B[of]LB[pc:A][me:B]C['a' is correct. 'b' is a mistake.]
 (;W[pc])
 (;W[me]
 ;B[ld]
 ;W[mg]
 ;B[ng]
 ;W[mh]
 ;B[oa]))))
 (;W[pc]
 ;B[od])
 (;W[dp]
 ;B[oa]
 ;W[pa]
 ;B[ra]
 ;W[pc]
 ;B[na]
 ;W[sd]
 ;B[pb]
 ;W[qb]
 ;B[qa]
 ;W[rb]
 ;B[pb]))
 (;W[pb]))
 (;B[mc]))
 (;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[nb]LB[ob:b][pf:a]C[White can extend further because of the strength of the four White stones.
 Joseki continues with Black 'a'. Black 'b' is a trick play.]
 (;B[pf])
 (;B[ob]LB[pb:a][oc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[oc]
 ;W[oa]
 ;B[mb]LB[qa:a][dp:b]C[White must play 'a' to live in the corner. White cannot play elsewhere ('b').]
 (;W[qa]C[White must play 18 to live.])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[qa]
 ;W[pa]
 ;B[ra]LB[sa:b][sc:a]C['a' and 'b' are miai. White is dead.]))
 (;W[oc]
 ;B[pb]
 ;W[pc]
 ;B[mb]
 ;W[nc]
 ;B[mc]LB[oa:b][od:a]C[White continues with 'a' or 'b'.]
 (;W[od]LB[oe:b][pf:a]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pf]
 ;W[ne]
 ;B[md]
 ;W[oe]LB[na:b][qg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qg]
 ;W[oa])
 (;B[na]C[Black 25 is a mistake.]
 ;W[pe]
 ;B[rf]
 ;W[qg]
 ;B[rg]C[Black must crawl along the second line, the line of defeat.]
 ;W[qh]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[qj]))
 (;B[oe]C[Black 21 is a mistake.]
 ;W[ne]LB[md:a][of:b]C[Neither Black 'a' nor 'b' are any good.]
 (;B[md]
 ;W[of]
 ;B[pe]
 ;W[pf]C[Black cannot escape.])
 (;B[of]
 ;W[md]C[The result is a disaster for Black.])))
 (;W[oa]LB[od:a]C[White holds the push at 'a in reserve.])))))
 (;AB[jc][je]
 ;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]))
 (;W[qd]C[Black 4 may be played when Black has a pincer as shown.]
 ;B[qc]LB[rc:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[rc]LB[rb:b][pc:a][qe:c]C[Black continues with 'a' to 'c'. Black 'a' is simple, 'b' severe, and 'c' the toughest.]
 (;B[pc]
 ;W[re]
 ;B[jc])
 (;B[rb]LB[pc:c][rd:b][re:a]C[Black 7 is tough-minded.
 White continues with 'a'. White 'b' is weak. 'c' is territorially ingerior, but enables White to go to the top side.]
 (;W[re]
 ;B[sc]LB[rd:c][sd:b][pe:a]C[White continues with 'a'; a favorable ladder to the lower left helps. White 'b' is unthinkable. White 'c' is a mistake.]
 (;W[pe]LB[od:a][rd:b]C[Black continues with 'a' or 'b'.]
 (;B[od]
 ;W[rd]
 ;B[pb])
 (;B[rd]
 ;W[od]
 ;B[qe]
 ;W[pc]
 ;B[qd]LB[oc:b][oe:a]C[White continues with 'a' if the ladder to the lower right is favorable, 'b' if not. White 'b' is bad for White.]
 (;W[oe]C[White must have the ladder to play this way.]
 ;B[oc]
 ;W[nc]
 ;B[pb]
 ;W[ob]
 ;B[pc]
 ;W[md]
 ;B[pf]
 ;W[ne]
 ;B[pg]C[Black gets a large area, White gets sente.])
 (;W[oc]C[White must play 16 with an unfavorable ladder to the lower left, but the result is awful.]
 ;B[oe]
 ;W[ne]
 ;B[pf]
 ;W[of]
 ;B[pe]
 ;W[md]
 ;B[nf]
 ;W[me]
 ;B[og])))
 (;W[sd]C[White 10 is a mistake.]
 ;B[rd]LB[qe:a]C[White does not have a ko threat big enough to stop Black 'a'.])
 (;W[rd]C[White 10 is a mistake.]
 ;B[pc]))
 (;W[rd]C[White 8 is not recommended.]
 ;B[pc]
 ;W[qh]
 ;B[jc])
 (;W[pc]
 ;B[qb]
 ;W[od]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[oc]
 ;B[qe]))
 (;B[qe]C[Black 7 is double tough.]
 ;W[rd]
 ;B[re]LB[pc:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[pc]
 ;B[pe]
 ;W[oc]
 ;B[nc])
 (;W[pe]
 ;B[rf]
 ;W[pf]
 ;B[qg]
 ;W[pg]
 ;B[qh]LB[pc:B][od:A]C['a' or 'b'.]
 (;W[od]
 ;B[pc]
 ;W[oc]
 ;B[ob]
 ;W[nc]LB[nb:a][rb:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nb]
 ;W[mc]
 ;B[rb])
 (;B[rb]
 ;W[nb]LB[pb:a][dp:b]C[Black continues with 'a'. If Black plays elsewhere, White gets a two-step ko.]
 (;B[pb])
 (;B[]C[Black plays elsewhere. White can get a two-step ko.]
 ;W[qb]
 ;B[pb]
 ;W[ra]LB[qa:a][sb:b]C[Black continues with 'a' and White has a two-step ko. Black 'b' gives White a ko.]
 (;B[qa]C[Black 26 and White has a two-step ko.]
 ;W[sb]C[White has a "flower-viewing" ko (that is, nothing to lose).])
 (;B[sb]C[Black 26 and White has a simple ko.]
 ;W[pa]))))
 (;W[pc]
 ;B[od]
 ;W[pb]
 ;B[ng]))))
 (;W[pe]LB[pc:b][od:a][rd:c]C[Black continues with 'a' or 'c'. Black 'b' is not recommended.]
 (;B[od]
 ;W[rc]LB[qb:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[re])
 (;B[qb]
 ;W[rb]))
 (;B[pc]C[Black 7 is not recommended.]
 ;W[ne]
 ;B[md]
 ;W[oj])
 (;B[rd]LB[od:B][re:A]C['a' to emphasize the right, 'b' for the top side.]
 (;W[re]
 ;B[oe]
 ;W[rc]
 ;B[qe])
 (;W[od]
 ;B[qe]
 ;W[pc]
 ;B[qd]LB[oc:B][oe:A]C['a' with the ladder, 'b' without.]
 (;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[pb]
 ;W[ob]
 ;B[pc]
 ;W[md]
 ;B[pf]
 ;W[ne]
 ;B[pg])
 (;W[oc]
 ;B[oe]
 ;W[ne]LB[of:A][pf:B]C['a' or 'b' are ok.]
 (;B[of]
 ;W[md]
 ;B[nf]
 ;W[me]
 ;B[mf])
 (;B[pf]
 ;W[of]
 ;B[pe]
 ;W[md]
 ;B[nf]
 ;W[nc]
 ;B[og]))))))
 (;W[lc]LB[ic:a][mc:d][id:e][me:c][qj:b]C[Black plays a pincer at 'a' or 'e' if there is Black support at top, 'b' if Black support at right, or the balanced 'c'. Black 'd' is a mistake.
 d4, c3, b2, a1]
 (;B[ic]LB[nb:f][oc:c][ie:e][le:a][me:b][oe:d]C[With a star-point stone at the top, Black 5 is a powerful pincer.
 White continues with 'a', 'b' or 'c'. White 'd' is a trick play. White 'e' is the vague sort of move found in handicap Go. White 'f' is a hopeless move.
 f6, e5, d4, c3, b2, a1]
 (;W[le]
 ;B[nf]LB[fd:b][ie:a][oe:c][pf:e][pg:d]C[White continues with 'a'. Trying to split Black with 'b' is reckless.
 'c' is not recommended.
 'd' leads to an interesting fight...
 'e' is possible.]
 (;W[ie]
 ;B[gd]
 ;W[pg]
 ;B[qe]LB[qc:B][re:A]TR[oe]C[Black 11 defends against the peep at the triangled position.
 'a' or 'b'.]
 (;W[re]C[Black 12 is not recommended.]
 ;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[oe]
 ;B[ne]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]LB[ob:b][pc:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[pc]
 ;B[ob]
 ;W[pb]
 ;B[na]
 ;W[rc]
 ;B[rf]
 ;W[rg]
 ;B[se]LB[qc:a][pf:b]C['a' and 'b' are miai. Black 'b' starts a capture squeeze.]
 ;W[qc]
 ;B[pf]
 ;W[of]
 ;B[og]
 ;W[pf]
 ;B[ph]
 ;W[qg]
 ;B[qh])
 (;W[ob]
 ;B[pc]
 ;W[md]
 ;B[lb]
 ;W[kb]
 ;B[kc]
 ;W[kd]C[White sets up a ko, but can't expect to win it.]))
 (;W[qc]
 ;B[re]LB[nb:B][ob:B][oc:A]C['a' for the corner, 'b' for the outside.]
 (;W[oc]
 ;B[pc]
 ;W[pb]
 ;B[nb]
 ;W[ob]
 ;B[nc]
 ;W[rb]
 ;B[od])
 (;W[nb]
 ;B[pb]
 ;W[oe]
 ;B[ne]
 ;W[oc]
 ;B[pc]
 ;W[od]
 ;B[of]
 ;W[pf]
 ;B[pe]
 ;W[ob]
 ;B[rf]
 ;W[oh]
 ;B[nh]
 ;W[ni]
 ;B[mh])))
 (;W[fd]C[White 8 is a mistake.]
 ;B[ie]
 ;W[df]
 ;B[kd]
 ;W[ld]
 ;B[lf]
 ;W[kf]
 ;B[ke]
 ;W[mf]
 ;B[lg]
 ;W[me]
 ;B[mg]
 ;W[ne]
 ;B[oe]C[White cannot break through. In his struggle for life, White hands Black the game by giving overwhelming thickness.])
 (;W[oe]
 ;B[pe]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg])
 (;W[pg]
 ;B[qe]LB[qc:A][re:B]C['a' is correct. 'b' is a mistake.
 * Joseki *]
 (;W[qc]
 ;B[re]LB[nb:A][oc:B]C['a' hunts on the outside, 'b' takes a small enclosed corner for huge influence.]
 (;W[nb]
 ;B[pb]
 ;W[oe]
 ;B[ne]
 ;W[oc]
 ;B[pc]
 ;W[od]
 ;B[of]
 ;W[pf]
 ;B[pe]
 ;W[ob]
 ;B[rf]
 ;W[oh]
 ;B[nh]
 ;W[ni]
 ;B[mh])
 (;W[oc]
 ;B[pc]
 ;W[pb]
 ;B[nb]
 ;W[ob]
 ;B[od]
 ;W[rb]
 ;B[nc]))
 (;W[re]
 ;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[oe]
 ;B[ne]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[pc]
 ;B[ob]
 ;W[rc]
 ;B[rf]
 ;W[rg]
 ;B[se]
 ;W[qc]
 ;B[pf]
 ;W[of]
 ;B[og]
 ;W[pf]
 ;B[ph]
 ;W[qg]
 ;B[qh]))
 (;W[pf]
 ;B[of]
 ;W[nb]
 ;B[pb]
 ;W[ie]
 ;B[gd]
 ;W[rd]
 ;B[nc]
 ;W[mb]
 ;B[qc]))
 (;W[me]LB[md:d][nf:a][of:c][pf:b]C[Black continues with 'a' to 'c'. Black 'd' is mischief making, a fight Black does not need.]
 (;B[nf]LB[ne:B][mf:C][pg:A]C['a' is correct. 'b' is a mistake. 'c' is possible.]
 (;W[pg]
 ;B[ne]C[
 * Joseki *]
 ;W[ke]
 ;B[ie])
 (;W[ne]
 ;B[oe]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[pg]
 ;W[oh]
 ;B[ph]
 ;W[oi]LB[md:A]C[Black can cut on 'a'.])
 (;W[mf]
 ;B[pg]
 ;W[qh]
 ;B[pf]
 ;W[qe]
 ;B[qd]))
 (;B[pf]
 ;W[pg]
 ;B[of]LB[qd:b][re:a]C[White continues with 'a' or 'b'.]
 (;W[re]LB[rd:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[qd]
 ;B[pe]
 ;W[rg]
 ;B[qc]
 ;W[rd]
 ;B[og]
 ;W[ph]
 ;B[mg])
 (;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]LB[oc:b][pe:c][qj:a]C[White continues with 'a'. White 'b' is a mistake.'c' is inferior, it captures the corner for huge outside influence.]
 (;W[qj]
 ;B[nc])
 (;W[oc]C[White 16 looks tough, but is a mistake.]
 ;B[nc]
 ;W[nb]
 ;B[ob]C[Black 19 is a tesuji.]
 ;W[pb]
 ;B[pc]
 ;W[oa]
 ;B[od]LB[ld:a][pi:b]C[White has gained trouble. 'a' and 'b' are miai.])
 (;W[pe]
 ;B[oe]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[na]
 ;W[pa])))
 (;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[pb]C[Black 13 is the way to make shape.]
 ;W[nb]C[If White tries 14....]
 ;B[nc]C[Black is unaffected.]))
 (;B[of]C[The shape of the three Black stones is called a "sake bottle".]
 ;W[ph]
 ;B[ng]
 ;W[rd]
 ;B[qc]
 ;W[je]
 ;B[hd])
 (;B[md]C[Black starts a fight.]
 ;W[ld]
 ;B[le]
 ;W[mf]
 ;B[ke]
 ;W[mb]LB[oc:a][jd:b]C[White 12 makes miai of 'a' and 'b'.]))
 (;W[oc]
 ;B[od]LB[nb:c][pb:d][nc:a][pc:b]C[White continues with 'a'. White 'b' to 'd' are not as favorable.
 d4, c3, b2, a1]
 (;W[nc]LB[pc:b][md:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[md]LB[kb:b][kc:d][pc:a][ld:c]C[White continues with 'a'. White 'b', 'c' and 'd' are not recommended.]
 (;W[pc]
 ;B[mc]
 ;W[mb]
 ;B[qc]
 ;W[kb]
 ;B[pb]
 ;W[ob]
 ;B[oa]
 ;W[nb]
 ;B[rb]
 ;W[le]
 ;B[ng]C[
 * Joseki *])
 (;W[kb]C[White 10 is not recommended.]
 ;B[kd]
 ;W[pc]LB[mc:A][qc:B]C['a' or 'b'-]
 (;B[mc]
 ;W[mb]
 ;B[qc]
 ;W[qb]LB[rb:b][rd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rd]LB[rb:a][pi:b]C[Black is at the advantage. 'a' and 'b' are miai.])
 (;B[rb]C[Black 17 is an overplay.]
 ;W[qd]
 ;B[rc]
 ;W[pe]
 ;B[pb]
 ;W[ob]
 ;B[qa]
 ;W[ld]LB[le:a]C[Black cannot now block at 'a'; White can break through to the right or left (Black can stop one, but not both).]))
 (;B[qc]LB[qb:A][qd:B]C['a' or 'b'.]
 (;W[qb]
 ;B[rd]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[kc]
 ;W[lb]
 ;B[lf])
 (;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf])))
 (;W[ld]C[White 10 is not recommended.]
 ;B[mc]
 ;W[mb]
 ;B[nb]LB[lb:a][ob:b]C[White 'a' is better than 'b'.]
 (;W[lb]
 ;B[ob])
 (;W[ob]
 ;B[lb]
 ;W[na]
 ;B[kb]LB[qc:b][le:a]C[White continues with 'a'. White 'b' is worse.]
 (;W[le]
 ;B[qb]
 ;W[pb]
 ;B[qd]
 ;W[pa]
 ;B[pg])
 (;W[qc]
 ;B[qd]
 ;W[rc]
 ;B[le])))
 (;W[kc]
 ;B[pc]
 ;W[ke]
 ;B[ie]
 ;W[kg]
 ;B[qe]
 ;W[pf]
 ;B[nf]C[Black has a much better position.]))
 (;B[pc]LB[md:a]C[The exchange of Black 9 for White 'a' is disadvantageous.]
 ;W[md]
 ;B[qe]
 ;W[pf]
 ;B[nf]
 ;W[pi]))
 (;W[pc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]
 ;B[ld])
 (;W[nb]LB[mc:a][pc:b][qe:c]C[Black continues with 'a'. Black 'b' looks better than it is.
 After looking at Black 'b', Black 'c' seems logical, but is not recommended.]
 (;B[mc]
 ;W[mb]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[qc]
 ;B[qd]
 ;W[rc]
 ;B[jc])
 (;B[pc]C[Black 9 is not recommended.]
 ;W[pb]
 ;B[nc]
 ;W[ob]
 ;B[qb]
 ;W[rd]
 ;B[rc]
 ;W[qd]
 ;B[qc]
 ;W[le]C[Black only has one eye in the corner.])
 (;B[qe]C[Black 9 is not recommended.]
 ;W[pf]
 ;B[pc]
 ;W[pb]
 ;B[nc]
 ;W[ob]
 ;B[qb]
 ;W[le]
 ;B[dp]C[Black plays elsewhere.]
 ;W[rb]
 ;B[qa]
 ;W[rd]C[Black has serious trouble.]))
 (;W[pb]LB[pc:b][qc:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qc]LB[qb:c][mc:a][le:b]C[White continues with 'a'. White 'b' is a mistake. White 'c' gives Black great thickness.]
 (;W[mc]C[White 10 is necessary.]
 ;B[pi])
 (;W[le]C[White 10 is a mistake.]
 ;B[mc]
 ;W[mb]
 ;B[nb]
 ;W[nc]
 ;B[md]C[White is now separated.])
 (;W[qb]C[White 10 is not recommended.]
 ;B[mc]
 ;W[mb]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[qi]
 ;B[jc]C[If Black plays at top again before White, White barely gets two eyes.]))
 (;B[pc]C[Black 9 is not recommended.]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[qb]
 ;W[rd]
 ;B[rc]
 ;W[qd]
 ;B[qc]
 ;W[le])))
 (;W[oe]C[A trick play by White.]
 ;B[od]
 ;W[me]LB[md:b][ne:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne]C[Black foils the trick play.]
 ;W[nf]LB[md:B][mf:A]C['a' is correct. 'b' is a mistake.]
 (;B[mf]
 ;W[le]
 ;B[pf]LB[ng:a][pg:b]C[White continues with 'a'. White 'b' is a mistake.
 * Joseki *]
 (;W[ng]
 ;B[qe])
 (;W[pg]C[White 14 is a mistake.]
 ;B[og]LB[of:B][ng:A]C[Neither 'a' nor 'b' work.]
 (;W[ng]
 ;B[oh]C[White is in serious trouble.]
 ;W[pe]
 ;B[of]
 ;W[qe]
 ;B[qd]
 ;W[qi]
 ;B[mh])
 (;W[of]
 ;B[pe]
 ;W[ng]
 ;B[oh]LB[nh:A][ph:B]C[Neither 'a' nor 'b' work.]
 (;W[nh]
 ;B[ph]
 ;W[qg]
 ;B[ni]
 ;W[lg]
 ;B[mi]
 ;W[lh]
 ;B[qh])
 (;W[ph]
 ;B[oi]
 ;W[mg]
 ;B[pi]
 ;W[qi]
 ;B[qj]
 ;W[rh]
 ;B[ri]
 ;W[qh]
 ;B[rj]LB[rd:B][qe:A]C[Neither 'a' nor 'b' work.]
 (;W[qe]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[se])
 (;W[rd]
 ;B[rf]
 ;W[qe]
 ;B[rg]
 ;W[qg]
 ;B[rc])))))
 (;B[md]
 ;W[ld]
 ;B[mf]
 ;W[le]
 ;B[of]
 ;W[ng]
 ;B[pf]
 ;W[pg]))
 (;B[md]C[Black 9 is a mistake.]
 ;W[ld]
 ;B[ne]
 ;W[nf]
 ;B[mf]
 ;W[le]
 ;B[of]
 ;W[ng]
 ;B[pe]
 ;W[og]))
 (;W[ie]
 ;B[kd]C[Black attacks.]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[jd]
 ;B[kc]
 ;W[jc]
 ;B[kb]
 ;W[jb]LB[lb:a][kf:b]C[Black continues with 'a' or possibly 'b'.]
 (;B[lb]C[Black captures the two White stones.]
 ;W[mc]CR[oc]SQ[od]C[White 18 is unreasonable, even if White has peeped and Black answered.]
 ;B[mb]
 ;W[nc]
 ;B[pc]
 ;W[pb]LB[nb:a][qb:b]C[Black continues at 'a'. Black 'b' is a costly mistake.]
 (;B[nb]
 ;W[ob]
 ;B[qb])
 (;B[qb]C[Black loses with 23.]
 ;W[nb]))
 (;B[kf]
 ;W[lb]
 ;B[je]
 ;W[ka]
 ;B[id]
 ;W[ke]
 ;B[kd]
 ;W[he]))
 (;W[nb]C[White 6 is weak.]
 ;B[qc]))
 (;B[qj]C[Black 5 is ideal with Black support at right as shown, combining pincer attack with extension.]
 ;W[rd]
 ;B[qc]
 ;W[qh]C[White takes root locally.]
 ;B[oj]C[Possible continuation.]
 ;W[oh]
 ;B[me]
 ;W[ic]
 ;B[pg]
 ;W[ph]
 ;B[ri]
 ;W[rh]
 ;B[rc])
 (;B[me]CR[kd]LB[ic:a][le:b]C[Black threatens the pressing move at the red dot. White continues with 'a' or 'b'.]
 (;W[ic]
 ;B[qe]
 ;W[pf]
 ;B[pi])
 (;W[le]
 ;B[lf]
 ;W[ke]LB[qe:a][mf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qe]
 ;W[pf]
 ;B[pi]LB[mf:a][nf:b]C[If White cuts at 'a', Black plays 'b' and captures the two stones at right on a large scale.])
 (;B[mf]C[Black 9 is weak.]
 ;W[rd]C[White can now establish himself.])))
 (;B[mc]C[Black 5 is cowardice.]
 ;W[ld]
 ;B[qe]
 ;W[pf]
 ;B[re]LB[oc:a]C[White still has the peep at 'a'. Giving White extensions as shown is to White's favor.])
 (;AB[dd]
 ;B[id]
 ;W[le]
 ;B[kd]
 ;W[ld]
 ;B[nf]
 ;W[pf]
 ;B[of]
 ;W[nb]
 ;B[pb]
 ;W[ib]
 ;B[gc]))
 (;W[]LB[qe:a][pf:c][qi:b][pj:d]C[White plays elsewhere. Black continues with 'a', 'c' or 'd'.
 Black 'c' is a mistake.]
 (;B[qe]
 ;W[pf]
 ;B[pi]
 ;W[nf]
 ;B[ld]
 ;W[ni]
 ;B[pk]LB[qc:a]C[As long as White is under attack, it is difficult to invade at 'a'.])
 (;B[qi]
 ;W[qk]
 ;B[oi]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[nb])
 (;B[pf]C[Black 5 is a mistake, as it strengthens White.]
 ;W[pg]
 ;B[of]
 ;W[re]
 ;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]
 ;W[qj])
 (;B[pj]LB[qd:A][rd:B]C['a' is usual, 'b' is possible.]
 (;W[qd]
 ;B[qc]
 ;W[rc]LB[rb:C][pc:A][qe:B]C['a' both settle quick and easy.
 'b' various outcomes.
 'c' both settle.]
 (;B[pc]
 ;W[re])
 (;B[qe]
 ;W[rd]LB[pe:B][re:A]C['a' gives White the choice.
 'b' gives the side and corner for big influence.]
 (;B[re]LB[pc:B][pe:A]C['a' gives the corner for influence.
 'b' takes the corner for influence.]
 (;W[pe]
 ;B[rf]
 ;W[pf]
 ;B[qg]
 ;W[pg]
 ;B[qh]
 ;W[od]
 ;B[pc]
 ;W[oc]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[rb])
 (;W[pc]
 ;B[pe]
 ;W[oc]
 ;B[nc]))
 (;B[pe]
 ;W[re]
 ;B[pf]
 ;W[qg]
 ;B[pg]))
 (;B[rb]
 ;W[re]
 ;B[sc]
 ;W[pe]
 ;B[od]
 ;W[rd]
 ;B[pb]
 ;W[qh]))
 (;W[rd]
 ;B[qc]
 ;W[qh])))
 (;AW[jc]
 ;W[ob]LB[nb:B][pb:A][oc:C][qc:D]C['a' is joseki.'b', 'c' and 'd' are inferior.]
 (;B[pb]LB[oc:A][qc:B]C[White secures the top and pushes Black into the corner on 'a' or secures the corner and pushes Black into a small top group on 'b'.
 * Joseki *]
 (;W[oc]
 ;B[pc]LB[mc:A][od:B]C['a' is correct, 'b' is no help.]
 (;W[mc]
 ;B[qe]
 ;W[pf]
 ;B[od])
 (;W[od]
 ;B[oe]
 ;W[mc]
 ;B[qe]
 ;W[pf]
 ;B[pe]TR[pf][qf]C[The Black corner is bigger, and the marked stones have less liverties.]))
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[lc]))
 (;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[qc]
 ;B[qd]
 ;W[od]
 ;B[oe]
 ;W[rc]
 ;B[rd]
 ;W[pc]
 ;B[pf]
 ;W[ne])
 (;B[oc]
 ;W[pb]
 ;B[nb]
 ;W[mc]
 ;B[nc]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[pf])
 (;B[qc]
 ;W[mc]))
 (;AW[jc]
 ;W[pb]LB[nb:B][oc:D][pc:A][qc:E][qe:C]C['a' is joseki. 'b' is inferior. 'c' fails to take the corner.
 'd' and 'e' leave Black with not much territory.]
 (;B[pc]LB[ob:A][qb:B]C['a' is correct. 'b' is a mistake.]
 (;W[ob]LB[qb:B][mc:A]C['a' is correct. 'b' is a mistake.]
 (;B[mc]C[
 * Joseki *]
 ;W[qc]
 ;B[qd]
 ;W[rc]
 ;B[rd]
 ;W[rb]
 ;B[qh])
 (;B[qb]
 ;W[rd]
 ;B[rc]
 ;W[qd]
 ;B[qc]
 ;W[mc]))
 (;W[qb]
 ;B[ob]
 ;W[rd]LB[rc:A]C[The White mistake is punished by the Black cutting tesuji on 'a'.]))
 (;B[nb]
 ;W[qd]
 ;B[qc]
 ;W[pc]
 ;B[qb]
 ;W[rd]
 ;B[oc]
 ;W[pe]
 ;B[od]
 ;W[rb])
 (;B[qe]
 ;W[pf]
 ;B[nb]
 ;W[qc]
 ;B[re]
 ;W[ob]
 ;B[nc]
 ;W[rb])
 (;B[oc]
 ;W[rd]
 ;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[mc])
 (;B[qc]
 ;W[mc]
 ;B[nb]
 ;W[nc]
 ;B[ob]
 ;W[oc]
 ;B[pc]
 ;W[od]))
 (;AB[jd]
 ;W[ld]LB[ke:A][me:B]C[Useful for games against 6 or more handicap stones.
 'a' or 'b' are ok.]
 (;B[ke]
 ;W[le]
 ;B[lf]LB[me:B][mf:A]C['a' White lives for big influence, 'b' prevents being enclosed, but creates a target for attack strenghening Black on both sides.]
 (;W[mf]
 ;B[me]
 ;W[lb]
 ;B[jb]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[pc]
 ;W[md]
 ;B[ne]
 ;W[pb]
 ;B[qb]
 ;W[oa]
 ;B[kf]C[White cannot activate his cutting stone because of the weakness of his top side group.]
 ;W[rd]
 ;B[rc]
 ;W[qd]
 ;B[qc]
 ;W[mg]
 ;B[nb]
 ;W[mb]
 ;B[lc]
 ;W[kc]
 ;B[kd]LB[kb:A][mc:B]C['a' gives some, 'b' gives all.]
 (;W[kb]
 ;B[mc]
 ;W[ob]
 ;B[jc]
 ;W[ka])
 (;W[mc]
 ;B[kb]))
 (;W[me]
 ;B[pf]LB[mf:A][pg:B]C['a' is correct, 'b' unnecessarily strenghens Black.]
 (;W[mf]
 ;B[qe])
 (;W[pg]
 ;B[of]
 ;W[mf]
 ;B[qg])))
 (;B[me]
 ;W[le]
 ;B[lf]LB[ke:B][kf:A]C['a' White lives for influence.
 'b' White prevents being enclosed but gets bad shape and not yet life.]
 (;W[kf]
 ;B[ke]
 ;W[lb]
 ;B[jb]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[pc]
 ;W[md]
 ;B[lg]
 ;W[pb]
 ;B[qb]
 ;W[oa]
 ;B[nf]
 ;B[je]C[This move threatens a sente 7.5 point gain.]
 ;W[dp]
 ;B[nb]
 ;W[mb]
 ;B[lc]
 ;W[kb]
 ;B[kc]
 ;W[na]
 ;B[mc]
 ;W[ob])
 (;W[ke])))
 (;W[qi]
 ;B[qe]LB[re:A][pf:B]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[rd]
 ;W[ql]C[End of joseki.]
 ;B[rf]C[Capturing here is slow.]
 ;W[rg]
 ;B[se])
 (;W[pf]
 ;B[qk]
 ;W[oi]))
 (;AB[jc]
 ;W[md]LB[mc:A][nc:C][ne:B]C[If White or nobody has the top left, 'a' is correct.
 If White has the top left, Black attacks on 'b'.
 'c' is too submissive.]
 (;B[mc]
 ;W[lc]LB[nc:A][ld:B]TR[jc]C['a' risks losing the triangled stone.
 'b' is therefore necessary, if White has the top left.]
 (;B[nc]
 ;W[ld])
 (;B[ld]
 ;W[me]LB[le:A][ne:B]C['a' is correct. 'b' is a mistake.]
 (;B[le]
 ;W[nc]
 ;B[mb]
 ;W[lf]
 ;B[je]
 ;W[mf]
 ;B[nb])
 (;B[ne]
 ;W[le]
 ;B[kd]
 ;W[nc]
 ;B[mb]
 ;W[oc]
 ;B[lb]
 ;W[od]
 ;B[oe]
 ;W[pe]
 ;B[og]
 ;W[qd])))
 (;B[ne]
 ;W[kd]
 ;B[jd]
 ;W[ke]
 ;B[je]
 ;W[kf])
 (;B[nc]))
 (;W[pi]LB[jc:B][jd:C][qe:A]C['a' or 'b'.
 'c' is a possible handicap continuation for White.]
 (;B[qe]LB[re:A][pf:B]C['a' is better than 'b'.]
 (;W[re]
 ;B[rd]
 ;W[ql]
 ;B[rf]
 ;W[rg])
 (;W[pf]
 ;B[qk]
 ;W[ri]))
 (;B[jc])
 (;B[jd]
 ;W[lc]LB[jc:B][ld:A]C['a' or 'b'.]
 (;B[ld]
 ;W[mc]
 ;B[md]
 ;W[jc]
 ;B[ic]
 ;W[kc]
 ;B[id]
 ;W[pb])
 (;B[jc]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]))))
 (;B[nc]LB[lc:d][qc:b][ld:g][od:f][qd:c][rd:a][qi:e][pj:h]TR[jd]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 Black 3 is solid and defensive. White continues with 'a', 'b', 'c', 'd', 'e' or 'h'.
 'e' is almost joseki (an invention of Kobayashi Koiichi).
 'f' is only good as ko threat or in handicap go.
 'g' initiates a trick play, if there is an additional Black stone on the triangled position like in handicap games.
 d4, c3, b2, a1
+]
 (;W[rd]LB[qc:a][qg:c][qh:b]C[Black continues with 'a', 'b' or 'c'.]
 (;B[qc]LB[lc:c][rc:d][pe:b][qi:a][qm:e]TR[pp]C[White continues with 'a' or 'b'. White 'c' and 'd' are given
 to illustrate Black responses.
 With an additional White stone on the triangled position, White can also play 'e'.]
 (;W[qi]LB[qg:B][dp:A]TR[qk]C['a' shows continuations for White.
 Later, Black can play 'b', especially with an additional stone on the triangled position.]
 (;B[dp]LB[lc:A][rc:B]C[Black plays elsewhere.
 White can attack on 'a' or 'b'.]
 (;W[lc]LB[rc:A][dp:B]C[Black on 'a' is a good answer. 'b' covers, what happens, if Black plays tenuki.]
 (;B[rc]C[Black 9 is necessary.])
 (;B[]
 ;W[rc]LB[rb:C][mc:A][nf:B]C[Black 'a' and 'b' are easy and recommended even if Black has the ladder,
 'c' possible, if Black has the ladder.]
 (;B[mc]C[Black forestalls a White invasion.]
 ;W[ld]
 ;B[rb])
 (;B[nf]
 ;B[pf]C[Later.])
 (;B[rb]
 ;W[pb]LB[ob:A][qb:B][re:C]C[White made the most famous hoshi trick play.
 'a' is correct, Black needs the ladder,
 'b' is getting tricked.
 'c' doesn't work.]
 (;B[ob]
 ;W[qb]
 ;B[ra]LB[sb:B][pc:A]C[
 * Joseki *
 White cannot gain a good result on 'a' if Black has the ladder.
 'b' doesn't work.]
 (;W[pc]
 ;B[qd]
 ;W[od]
 ;B[pe]LB[oc:A][oe:B]C[If White does not have the ladder, he plays a disadvantageous
 furikawari on 'a'.
 If he has the ladder, he destroys Black on 'b'.]
 (;W[oc]LB[oe:A][re:B]C['a' is correct. Capturing immediately on 'b' is inferior.]
 (;B[oe]LB[nd:A][qe:B]C['a' gives less than 'b'.]
 (;W[nd]
 ;B[re])
 (;W[qe]
 ;B[nd]
 ;W[nb]
 ;B[pa]
 ;W[oa]
 ;B[qa]
 ;W[ob]
 ;B[mb]))
 (;B[re]
 ;W[of]))
 (;W[oe]
 ;B[pf]
 ;W[qe]LB[oc:A][pg:B]C['a' keeps the corner with the ladder.
 'b' loses the corner.]
 (;B[oc]
 ;W[pg])
 (;B[pg]
 ;W[oc])))
 (;W[sb]
 ;B[pc]))
 (;B[qb]LB[nb:B][oc:A]C[White connects on 'a' or 'b'.]
 (;W[oc]
 ;B[od]
 ;W[nb]C[Black has nothing.])
 (;W[nb]
 ;B[mb]LB[mc:B][oc:A]C['a' is correct. 'b' is a mistake.]
 (;W[oc])
 (;W[mc]
 ;B[ob]
 ;W[oc]
 ;B[na]
 ;W[nd]
 ;B[nb])))
 (;B[re]
 ;W[qe]
 ;B[qd]
 ;W[rf]
 ;B[ob]
 ;W[qb]
 ;B[pc]
 ;W[ra]
 ;B[sb]
 ;W[qa]
 ;B[oa]
 ;W[se]
 ;B[pa]
 ;W[sc]
 ;B[sa]
 ;W[qb]))))
 (;W[rc]
 ;B[kc]))
 (;AB[qk]
 ;B[qg]LB[pg:C][rg:B][qh:A]C['a' is correct, 'b' and 'c' are disadvantageous.]
 (;W[qh]LB[qe:A][rf:B]C['a' is correct, 'b' is questionable.]
 (;B[qe]
 ;W[re]
 ;B[pf]
 ;W[rf]LB[og:B][pg:A][oh:C]C[Later, Black 'a', 'b', 'c' are sente.])
 (;B[rf]
 ;W[re]
 ;B[pf]
 ;W[qe]LB[pg:B][rg:A]C[Black cannot cut neither on 'a' nor 'b'.]
 (;B[rg]
 ;W[pg])
 (;B[pg]
 ;W[rg])))
 (;W[rg]
 ;B[rf]LB[re:B][pg:A]C['a' or 'b'.]
 (;W[pg]
 ;B[qe]
 ;W[qh]
 ;B[re])
 (;W[re]
 ;B[rh]
 ;W[qh]
 ;B[sg]
 ;W[pg]
 ;B[ri]
 ;W[rg]C[This ko is bad for White.]))
 (;W[pg]
 ;B[rf]
 ;W[qe]
 ;B[qh]
 ;W[ph]
 ;B[ri]
 ;W[rh]
 ;B[rg]
 ;W[rj]
 ;B[sh]
 ;W[qj]
 ;B[pi]
 ;W[sf]C[White cannot kill.]
 ;B[re]
 ;W[se]
 ;B[qd]
 ;W[pf]
 ;B[rc])))
 (;W[pe]LB[od:a][qd:b]C[Black continues with 'a' or 'b'.]
 (;B[od]C[Black 7 is a bit submissive, but the outcome is roughly equal.]
 ;W[rc]
 ;B[rb]
 ;W[qd]
 ;B[pb]
 ;W[qi])
 (;B[qd]
 ;W[rc]
 ;B[rb]
 ;W[od]
 ;B[oc]
 ;W[qe]
 ;B[pb]
 ;W[qj]C[The extension of White 14 is necessary.]))
 (;W[lc]LB[rc:a][dp:b]C[White 6 is not joseki, but may make strategic sense. Black continues with 'a'. Black cannot afford to play elsewhere ('b').]
 (;B[rc]C[Black 7 may seem submissive, but is necessary to live in the
 corner.])
 (;B[]C[Black plays elsewhere, a mistake.]
 ;W[rc]LB[rb:a][mc:b]C[Black continues with 'a' or 'b'.]
 (;B[rb]
 ;W[pb]LB[ob:b][qb:a]C[The obvious move is Black 'a'. Black 'b' looks like a tesuji, but the result is not good for Black.]
 (;B[qb]
 ;W[oc]
 ;B[od]
 ;W[nb]C[Black has had his corner hollowed out, and must flee to the center.])
 (;B[ob]
 ;W[qb]
 ;B[ra]
 ;W[pc]
 ;B[qd]
 ;W[od]
 ;B[pe]LB[oc:a][oe:b]C[White continues with 'a', or, having a favorable ladder to the lower left corner (forget Black 7), White may play 'b'.]
 (;W[oc]
 ;B[re]
 ;W[of])
 (;W[oe]C[White must have the ladder to the lower left corner to play this way.]
 ;B[pf]
 ;W[qe]LB[oc:a][pg:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oc]
 ;W[pg])
 (;B[pg]C[Black 21 is untenable.]
 ;W[oc]C[Black's position is terrible.]))))
 (;B[mc]
 ;W[ld]
 ;B[rb]LB[lb:a]C[White 'a' is still sente.])))
 (;W[rc]C[White 6 is not joseki.]
 ;B[kc]C[Black must extend to ensure life.])
 (;AW[pp]
 ;W[qm]
 ;B[qh]LB[rc:C][pe:A][of:B]C['a' is correct.
 'b' and 'c' are disadvantageous.]
 (;W[pe]LB[qd:B][oe:C][qk:A]C['a' is correct.
 'b' and 'c' are disadvantageous.]
 (;B[qk]
 ;W[od]
 ;B[oc]
 ;W[qd]
 ;B[pc]
 ;W[nf])
 (;B[qd]
 ;W[rc]
 ;B[rb]
 ;W[od]
 ;B[oc]
 ;W[qe]
 ;B[qb]
 ;W[qj]
 ;B[oh]
 ;W[nf])
 (;B[oe]
 ;W[of]
 ;B[ne]
 ;W[qd]
 ;B[pc]
 ;W[qj]))
 (;W[of]
 ;B[oh]
 ;W[mf]
 ;B[qk])
 (;W[rc]
 ;B[pf])))
 (;B[qh]LB[qc:A][of:B]C[Black 5 is a powerful move, and works well with Black 3. 'a'
 is correct, 'b' is wrong.]
 (;W[qc]LB[pc:b][qe:a][pf:c]C[Black continues with 'a'. Black 'b' is weak. 'c' avoids a cutting
 stone.]
 (;B[qe]LB[pe:b][re:a]C[White continues with 'a' or 'b'.
 White 'a' is tough-minded, giving White an equal result (a White corner and access to the outside).
 White 'b' gives Black a slightly favorable result (Black thickness versus a small White corner).]
 (;W[re]
 ;B[pf]LB[rf:B][pg:A]C['a' or 'b', depensing on the overall position.]
 (;W[pg]LB[rf:B][pg:10][qg:A]C[Black 'a' is usual. If 'b' leads to a good result considering the surrounding positions, than White 10 is wrong.]
 (;B[qg]
 ;W[rf]
 ;B[of])
 (;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[ph]
 ;B[qi]))
 (;W[rf]
 ;B[pg]C[Usually Black is favorable. His wall has no weak points.])
 (;W[ob]C[Also possible]))
 (;W[pe]
 ;B[pf]
 ;W[oe]LB[qd:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[qd]
 ;B[qg]LB[oc:a][od:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc]
 ;B[nd]
 ;W[od]
 ;B[ob]LB[pb:A][ne:B]C['a' or 'b'.]
 (;W[pb]
 ;B[nf]C[End of joseki.]
 ;W[ne]C[Later]
 ;B[me]
 ;W[md]
 ;B[of]
 ;W[pc]
 ;B[le]
 ;W[mc])
 (;W[ne]
 ;B[pb]LB[mb:B][pc:A]C['a' is correct. Trying to surround Black on 'b' fails.]
 (;W[pc]
 ;B[ld]
 ;W[qb])
 (;W[mb]
 ;B[nb]LB[pc:B][ld:A]
 (;W[ld]
 ;B[pc]LB[lc:B][mc:A]
 (;W[mc]
 ;B[md]
 ;W[me]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]LB[qb:A][le:B]
 (;W[qb]
 ;B[le]
 ;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[ie])
 (;W[le]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[re]
 ;W[sc]
 ;B[se]
 ;W[sd]
 ;B[qa]
 ;W[na]
 ;B[sa]))
 (;W[lc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[re]
 ;W[sc]
 ;B[se]
 ;W[sd]
 ;B[qa]))
 (;W[pc]
 ;B[ld]))))
 (;W[od]
 ;B[oc]C[White loses his eye shape.])
 (;W[nd]C[Move played by Lee Sedol twice in his game against Xie He, Chunlan cup final match, 2011.]
 ;B[oc]
 ;W[ld]
 ;B[mc]
 ;W[lc]
 ;B[lb]
 ;W[kb]
 ;B[md]
 ;W[me]
 ;B[le]
 ;W[mf]LB[la:A][lg:B]C[There are 2 ways now. Black can live at 'a' or fight actively at 'b'.])
 (;W[re]C[Trick move or new pattern.]
 ;B[qf]C[The best decision for Black is tenuki. Connecting at R14 is heavy.]
 ;W[oc]
 ;B[nd]
 ;W[od]C[Now the result is slightly better for White, comparing to the normal joseki.]))
 (;B[qd]LB[od:b][re:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]LB[pc:a][rf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[qg]LB[rc:b][pg:a]C[Black continues with 'a' or 'b'.]
 (;B[pg]
 ;W[ph]
 ;B[nf]
 ;W[pi]
 ;B[ng]
 ;W[rh])
 (;B[rc]
 ;W[ph]LB[of:a]C[Black later aims to play 'a'.]))
 (;B[rf]C[Black 13 is a mistake; an act of impatience.]
 ;W[oc]
 ;B[od]
 ;W[nd]
 ;B[qg]
 ;W[pc]
 ;B[qf]
 ;W[mc]
 ;B[ne]
 ;W[md]C[White gets considerable profit, while Black position is somewhat unresolved, as White's two stones still have aji.]))
 (;W[od]C[White 12 is a mistake.]
 ;B[pc]
 ;W[oc]
 ;B[pb]
 ;W[pg]
 ;B[rf]
 ;W[of]
 ;B[re]LB[ob:a]C[Black can play 'a' to connect to Black 3 because 3 was the knight's move, not the one-space jump. White having to add a stone at 'a' to complete his thickness is painful. The result is a Black success.]))))
 (;B[pc]LB[of:b][pf:a]C[Black 7 is a mistake.
 White continues with 'a'. White 'b' is an overplay, leaving White subject to being cut in two.]
 (;W[pf]C[White 8 is the best way to avoid being sealed in. White 8 may seem slow, but other moves leave weaknesses for Black to exploit.])
 (;W[of]
 ;B[qd]
 ;W[rc]
 ;B[pf]
 ;W[pg]
 ;B[rf]))
 (;B[pf]LB[qe:A]C['a' is correct. All other moves are mistakes doing nothing than unneccesarily strengthen Black more than 'a' does.]
 ;W[qe]
 ;B[pg]))
 (;W[of]
 ;B[qc]))
 (;B[qg]LB[pg:a][rg:b]C[Black 5 is a Korean innovation.
 White continues with 'a' or, with the ladder, 'b'.
 As 'b' gets Black a ladder breaker it's disadvantageous.]
 (;W[pg]LB[qe:B][pf:C][qh:A]C[White 6 is the only feasible continuation.
 'a' is correct, 'b' and 'c' are not recommended.
+]
 (;B[qh]LB[pe:D][pf:B][rf:C][ph:A]C['a' is correct, 'b', 'c' and 'd' are other variations which might be inferior (or simply older).
+]
 (;W[ph]LB[rf:A][qi:B]C['a' is correct. 'b' is a mistake.]
 (;B[rf]LB[qe:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;W[qe]LB[qi:B][qj:A]C['a' or 'b'.]
 (;B[qj]
 ;W[pi]LB[qk:A][rk:B]C['a' is usual, 'b' is good if White is in the lower right corner.]
 (;B[qk]
 ;W[qc]LB[kc:A][pc:B][re:C]C['a' is better than 'b'.
 'c' is a mistake.]
 (;B[kc])
 (;B[pc]
 ;W[re]
 ;B[kc])
 (;B[re]
 ;W[qd]LB[pd:1]C[Black 1 is now damaged for nothing.]))
 (;B[rk]
 ;W[qc]
 ;B[re]
 ;W[qd]
 ;B[pc]CR[pf]LB[pb:b][rb:a][ne:c]C[The sequence ends.
 Black currently has one eye in the corner. Playing White 'a' gives White two eyes in the corner, but the move is desparately small. If White is trying to make two eyes in the corner, White 'b' leads to a ko.
 Locally, White 'c' covers the cut at the red dot, but may not be the best strategic play.]
 (;W[rb]C[White to live in the corner. This should not be played immediately. White should be able to make eyes in the center]
 ;B[pb]
 ;W[sc])
 (;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa])
 (;W[ne])))
 (;B[qi]
 ;W[qc]
 ;B[pc]
 ;W[re]
 ;B[pi]))
 (;W[re]
 ;B[pf]
 ;W[qe]
 ;B[pi]))
 (;B[qi]LB[qc:B][pe:A]C['a' is correct, 'b' is questionable.]
 (;W[pe]
 ;B[qc]
 ;W[od]
 ;B[oc]
 ;W[qd]
 ;B[pc]
 ;W[pk])
 (;W[qc]C[White opts for the corner, leaving the two White stones in peril.]
 ;B[pf]
 ;W[rf]
 ;B[of]LB[og:a]C[The thinking behind this variation, first exchanging White 6 for Black 7 before switching to the corner, is that Black cannot immediately catch the White stones in a ladder at 'a'. Nonetheless, White cannot immediately pull out the two stones.])))
 (;W[pf]
 ;B[qc]LB[pj:a]C[White can continue with 'a' as an attack on the two Black side stones. White 'a' works well with a White presence at the bottom right.]
 ;W[pj]LB[rf:a]C[Black is satisfied to have played in the corner and on the side.
 Black 'a' is sente, though it solidifies White's thickness.
 If later he can play at 'a', 1 is ideally placed. White can attack with 10, which works particularly well if he has thickness at the bottom, but Black doesn't necessarily need to fear that fight, since 'a' is sente.]
 ;B[rf]
 ;W[re]
 ;B[sg]
 ;W[pe]LB[pi:a][qj:c][rj:b]C[Black may continue with 'a' to 'c'.]
 ;B[pi]
 ;W[oi]
 ;B[qj]
 ;W[pk]
 ;B[rl])
 (;W[rf]LB[qc:b][ph:a]C[Black continues with 'a' to emphasize the right side, or 'b' to take the corner.]
 (;B[ph]LB[qc:b][of:a]C[White can now defend the cutting point with 'a' or take the corner with 'b'. White 'a' gives Black a chance to build thickness toward
 the bottom right.]
 (;W[of]
 ;B[qc]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[ni]C[Because he?s already safe in the corner, Black can continue to build influence.])
 (;W[qc]
 ;B[nh]LB[pf:b][og:a]C[Black keeps 'a' and 'b' in reserve.]))
 (;B[qc]C[Black can also immediately take the corner.]
 ;W[ph]
 ;B[qi]
 ;W[pe]LB[qd:b][dp:a]C[Black ends in sente.]
 ;B[dp]C[Black plays elsewhere.]
 ;W[od]C[White forces. This play should be made fairly early.]
 ;B[oc]
 ;W[qd]
 ;B[pc]))
 (;W[pe]LB[qc:a][qd:b]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[od]
 ;B[oc]
 ;W[qd]
 ;B[pc]LB[rf:a]C[The difference of this sequence and White playing at 'a' and Black at 9, is that White can immediately play the forcing sequence from 10 to 13.])
 (;B[qd]
 ;W[rc]LB[oe:a][rf:b]C[White 10 is feasible.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oe]
 ;W[qe]
 ;B[of]
 ;W[pc]
 ;B[od]
 ;W[ob]C[The result is a roughly equal trade-off of Black thickness for White territory.])
 (;B[rf]
 ;W[re]
 ;B[qe]
 ;W[pf]
 ;B[rg]
 ;W[od]LB[pb:b][qb:a]C[White captures the three Black stones. If Black 'a', White 'b'.]
 ;B[qb]
 ;W[pb]))))
 (;B[qe]
 ;W[re]
 ;B[pf]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[pe]
 ;W[qc]C[Black has two weak groups.
 ])
 (;B[pf]LB[qe:A][qh:B]C[Whtie punishes on 'a' and fails to do so on 'b'.
+]
 (;W[qe]LB[pe:B][qh:A]C['a' or 'b' don't help.
+]
 (;B[qh]
 ;W[pe]
 ;B[of]
 ;W[oe])
 (;B[pe]
 ;W[qh]))
 (;W[qh]
 ;B[qe]
 ;W[rg]
 ;B[re])))
 (;W[rg]LB[qe:B][rf:A]C[Black 6 depends on the ladder.
 'a' or 'b'.]
 (;B[rf]LB[re:c][pg:a][qh:b]C[White must have the ladder to play 'a'.
 White 'b' and 'c' leave White in a low position.]
 (;W[pg]
 ;B[qh]
 ;W[rh]
 ;B[qe]
 ;W[pf]
 ;B[re]
 ;W[qi]LB[qc:a]C[White can live in the corner by playing 'a'.]
 ;B[pp]C[Black plays elsewhere (not breaking the ladder).]
 ;W[qc]LB[ob:A][pb:C][pc:B]C[This shows that White can live in the corner after Black 'a', 'b' or 'c'.]
 (;B[ob]LB[pb:C][rb:B][pc:A]C['a' or 'b' are correct, 'c' fails.]
 (;W[pc]LB[qa:C][oc:B][od:A]C['a', 'b' or 'c' don't kill.]
 (;B[od]
 ;W[rb]
 ;B[sc]LB[pb:A][sb:B][sd:C]C['a' lives, 'b' and 'c' fail.]
 (;W[pb]
 ;B[qa]
 ;W[sb]LB[pa:B][sd:A]C[Neither 'a' nor 'b' kill.]
 (;B[sd]
 ;W[oc]LB[nb:B][nd:A]C['a' leads to a small, 'b' to a big loss.]
 (;B[nd]
 ;W[pa]
 ;B[ra]
 ;W[nb])
 (;B[nb]
 ;W[pa]
 ;B[ra]
 ;W[nd]LB[lc:B][ne:A][oe:C]C[Black 'a', 'b' or 'c' fail.]
 (;B[ne]
 ;W[md]
 ;B[lb]
 ;W[oe]
 ;B[of]
 ;W[pe]
 ;B[ph]
 ;W[qd]
 ;B[ri]
 ;W[sf])
 (;B[lc]
 ;W[ne])
 (;B[oe]
 ;W[md]
 ;B[lc]
 ;W[nf]
 ;B[ne]
 ;W[me]
 ;B[of]
 ;W[ng]
 ;B[og]
 ;W[oh])))
 (;B[pa]
 ;W[sd]
 ;B[ra]
 ;W[oc]
 ;B[nb]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[oe]
 ;W[lc]
 ;B[lb]
 ;W[kb]LB[mb:A][kc:B]C[Neither 'a' nor 'b' work.]
 (;B[mb]
 ;W[kc]
 ;B[qb]
 ;W[oa]
 ;B[na]
 ;W[la]
 ;B[qd]
 ;W[rc]
 ;B[se]
 ;W[mc])
 (;B[kc]
 ;W[kd]
 ;B[jc]
 ;W[mf]
 ;B[og]
 ;W[of]
 ;B[nf]
 ;W[ng]
 ;B[ph]
 ;W[oh]
 ;B[qb]
 ;W[me]
 ;B[qd]
 ;W[rc]
 ;B[oa]
 ;W[sf]
 ;B[se]
 ;W[pe])))
 (;W[sb]
 ;B[pb]
 ;W[sd]
 ;B[ra]
 ;W[qa]
 ;B[qb]
 ;W[oc]
 ;B[nd])
 (;W[sd]
 ;B[pb]
 ;W[qb]
 ;B[qa]
 ;W[ra]
 ;B[sb]
 ;W[oc]
 ;B[nd]))
 (;B[oc]
 ;W[sd]LB[rb:A][od:B]C['a' or 'b' don't kill.]
 (;B[rb]
 ;W[se]
 ;B[sf]
 ;W[pe]
 ;B[qd]
 ;W[od])
 (;B[od]
 ;W[rb]LB[pb:A][sc:B]
 (;B[pb]
 ;W[sc])
 (;B[sc]
 ;W[pb])))
 (;B[qa]
 ;W[od]LB[oe:B][pe:A]
 (;B[pe]
 ;W[oe]
 ;B[oc]
 ;W[qd])
 (;B[oe]
 ;W[pe]
 ;B[qd]
 ;W[se])))
 (;W[rb]LB[qa:B][sc:A]C[Neither 'a' nor 'b' kill.]
 (;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[pc]
 ;B[oc]
 ;W[pe]
 ;B[qd]
 ;W[od])
 (;B[qa]
 ;W[pc]LB[oc:A][od:B]C[Neither 'a' nor 'b' work.]
 (;B[oc]
 ;W[pe]
 ;B[qd]
 ;W[od]
 ;B[sd]
 ;W[rc]
 ;B[ra]
 ;W[sf])
 (;B[od]
 ;W[oc]LB[nb:B][nd:A]C[Neither 'a' nor 'b' work.]
 (;B[nd]
 ;W[pb]
 ;B[nb]
 ;W[pa])
 (;B[nb]
 ;W[nd]
 ;B[oe]
 ;W[ra]
 ;B[sc]
 ;W[sd]
 ;B[sb]
 ;W[md]LB[lc:A][nf:B]C[Neither 'a' nor 'b' nor work.]
 (;B[lc]
 ;W[nf])
 (;B[nf]
 ;W[lc]
 ;B[lb]
 ;W[kb]
 ;B[mb]
 ;W[kc]
 ;B[se]
 ;W[qd]
 ;B[pe]
 ;W[pb]
 ;B[pa]
 ;W[oa]
 ;B[na]
 ;W[la])))))
 (;W[pb]
 ;B[rb]))
 (;B[pc]LB[pb:B][rb:A]C[White lives with 'a' and dies with 'b'.]
 (;W[rb]LB[pb:A][sc:B]C['a' is correct. 'b' attempts to kill but fails and just loses some points on the top.]
 (;B[pb]LB[sc:B][qd:A]C['a' is correct and gives life, 'b' is wrong and gives only a ko.]
 (;W[qd]
 ;B[qb]
 ;W[sd]
 ;B[ra]
 ;W[pe]
 ;B[sb])
 (;W[sc]
 ;B[qb]
 ;W[qd]
 ;B[ra]
 ;W[pe]
 ;B[sb]
 ;W[sa]))
 (;B[sc]
 ;W[pb]LB[ob:A][sd:B]C['a' or 'b' don't kill.]
 (;B[ob]LB[qa:A][qd:B]C['a' or 'b' are okay.]
 (;W[qa]LB[sb:B][sd:A]C['a' or 'b' don't kill.]
 (;B[sd]
 ;W[sb])
 (;B[sb]
 ;W[sd]))
 (;W[qd]LB[pa:B][pe:A]C['a' is correct. 'b' loses stones.]
 (;B[pe]
 ;W[qa]
 ;B[sd]
 ;W[sb])
 (;B[pa]LB[qa:B][qb:C][pe:A]C['a' is correct. 'b' is possible with good ko threats. 'c' is a mistake.]
 (;W[pe]LB[qb:A][sd:B]C['a' or 'b' don't kill.]
 (;B[qb]
 ;W[se]
 ;B[ra]
 ;W[sb])
 (;B[sd]
 ;W[sf]
 ;B[se]
 ;W[sb]
 ;B[sg]
 ;W[rc]))
 (;W[qa]
 ;B[qb]
 ;W[pe]
 ;B[sd]
 ;W[pb])
 (;W[qb]
 ;B[pe]
 ;W[sd]
 ;B[sb]LB[qa:A][sa:B]C['a' or 'b' don't help to live.]
 (;W[qa]
 ;B[sa])
 (;W[sa]
 ;B[qa])))))
 (;B[sd]LB[ob:A][sb:B]C[White lives or moves out on 'a' or lives on 'b'.]
 (;W[ob]LB[nb:A][sb:B]C['a' or 'b' don't kill.]
 (;B[nb]
 ;W[sb]
 ;B[qa]
 ;W[ra]
 ;B[oa]
 ;W[qb])
 (;B[sb]
 ;W[nb]))
 (;W[sb]
 ;B[ob]
 ;W[qa]))))
 (;W[pb]
 ;B[rb]
 ;W[qb]
 ;B[ob]
 ;W[qd]
 ;B[pe]
 ;W[ra]
 ;B[sb]LB[pa:A][sc:B]
 (;W[pa]
 ;B[sd]
 ;W[sc]
 ;B[rc])
 (;W[sc]
 ;B[pa])))
 (;B[pb]
 ;W[pc]
 ;B[oc]
 ;W[qb]
 ;B[ob]
 ;W[sd]
 ;B[rb]
 ;W[se]LB[qd:B][sf:A]
 (;B[sf]
 ;W[pe]
 ;B[qd]
 ;W[od]
 ;B[rc]
 ;W[sg])
 (;B[qd]
 ;W[rc]
 ;B[sf]
 ;W[sb])))
 (;W[qh]
 ;B[pg]
 ;W[re]
 ;B[pf]
 ;W[sf]C[This sente sequence is good enough for Black.])
 (;W[re]
 ;B[pf]
 ;W[sf]
 ;B[qh]
 ;W[qc]))
 (;B[qe]
 ;W[qh]
 ;B[re]
 ;W[rf]
 ;B[rc])))
 (;B[ph]C[New Chinese idea]
 ;W[qc]
 (;B[pf]
 ;W[qg]
 ;B[pg]C[Black is very thick. The result is equal])
 (;B[qe]
 ;W[re]
 ;B[pf]
 ;W[qg]
 ;B[pg]))
 (;B[rh]C[Rare joseki. Black can use it only if he has some stones on the lower right.]
 ;W[qc]
 ;B[pc]
 (;W[rg]
 ;B[qh]
 ;W[pf]C[Joseki])
 (;W[qg]C[Good shape])
 (;W[rf]C[Solid, but little bit passive for White.])))
 (;W[qc]LB[qj:a]C[White may play this way when Black has a pincer at 'a'. Otherwise, White would not prefer to crawl into such a small space.]
 ;B[qd]LB[pc:B][rd:A]C['a' is correct. 'b' is questionable.]
 (;W[rd]LB[pc:B][re:A]C['a' to separate White, or 'b'.]
 (;B[re]
 ;W[rc]
 ;B[qe]LB[ob:A][pc:B]C['a' or 'b'.]
 (;W[ob]LB[nb:a][oc:b]C[Black continues with 'a', possibly 'b' if White has support at top.]
 (;B[nb]
 ;W[oc]
 ;B[od]LB[pc:a][nd:c][dp:b]C[White continues with 'a', or dies ('b', playing elsewhere).
 White can only cut at 'c' with support at top to quickly capture the two black stones.]
 (;W[pc]
 ;B[me]C[
 * Joseki *])
 (;W[]LB[oa:a][pb:b][pc:c]C[White plays elsewhere, a fatal mistake. Black continues with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[oa]LB[qa:a][pb:b]C[Neither White 'a' nor 'b' work.]
 (;W[qa]
 ;B[sd]
 ;W[sb]
 ;B[ra]
 ;W[rb]
 ;B[pb])
 (;W[pb]
 ;B[sd]
 ;W[rb]
 ;B[qa]))
 (;B[pb]C[Black 14 is a mistake.]
 ;W[pc]
 ;B[oa]
 ;W[qb]
 ;B[pa]
 ;W[qa]
 ;B[na]
 ;W[sb]LB[ra:a][sd:b]C['a' and 'b' are miai.])
 (;B[pc]C[Black 14 is a mistake.]
 ;W[pb]LB[ra:a][sb:b]C[Black may try 'a' or 'b'. Neither work.]
 (;B[ra]
 ;W[qa]
 ;B[rb]
 ;W[sb]LB[oa:a][sd:b]C['a' and 'b' are miai.])
 (;B[sb]
 ;W[rb])))
 (;W[nd]
 ;B[lc]
 ;W[ne]
 ;B[pf]
 ;W[pc]))
 (;B[oc]C[Black 11 makes sense if White has a stone as shown.]
 ;W[nb]LB[mb:c][mc:a][pf:b]C[Black continues with 'a' or 'b'. 'c' can be possible.]
 (;B[mc])
 (;B[pf]C[Black 13 works well with support at right as shown.]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[oj]C[Black has a great position.])
 (;B[mb]
 ;W[pc]
 ;B[mc]
 ;W[pf])))
 (;W[pc]
 ;B[oc]
 ;W[rf]LB[se:A][sf:B]C['a' is correct. 'b' is a mistake.]
 (;B[se]
 ;W[pf]LB[pb:B][oe:A]C['a' is correct, 'b' takes the corner for too much influence.]
 (;B[oe]
 ;W[pb]
 ;B[ng]
 ;W[pj])
 (;B[pb]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[pe]
 ;W[md]
 ;B[qb]
 ;W[nf]))
 (;B[sf]
 ;W[sd]
 ;B[se]
 ;W[rh])))
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]))
 (;W[pc]LB[oc:A][rc:B]C['a' gives White the L+2 shape.
 'b' is risky, leaving a cut.]
 (;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe])
 (;B[rc]
 ;W[rb]
 ;B[rd]LB[nb:A][oc:B]C['a' is correct, 'b' is disadvantageous.]
 (;W[nb]LB[mb:B][mc:A]C['a' or 'b'.]
 (;B[mc]
 ;W[mb]
 ;B[lc])
 (;B[mb]
 ;W[ob]
 ;B[mc]LB[od:A]C[The cut of 'a' remains.]))
 (;W[oc]
 ;B[od]
 ;W[nb]
 ;B[mb]))))
 (;W[qd]
 ;B[qc]
 ;W[rc]LB[rb:a][pc:c][qe:b]C[Black continues with 'a' or 'b'. 'c' is inferior.]
 (;B[rb]LB[pc:D][rd:B][pe:C][re:A]C['a' is joseki, 'b' and 'c' are other variations, 'd' is a furikawari, giving Black more territory.]
 (;W[re]
 ;B[sc]LB[rd:A][pe:B]C['a' is joseki, 'b' is a mistake.]
 (;W[rd]
 ;B[pc]
 ;W[pe]C[
 * Joseki *])
 (;W[pe]
 ;B[rd]
 ;W[od]
 ;B[pc]))
 (;W[rd]
 ;B[pc]
 ;W[pe])
 (;W[pe]
 ;B[od]
 ;W[re]
 ;B[sc]LB[rd:A][sd:B]C[White answers on 'a' to solidify or 'b' to play the ko.])
 (;W[pc]
 ;B[qb]
 ;W[od]
 ;B[pe]
 ;W[oc]
 ;B[qe]
 ;W[nd]))
 (;B[qe]
 ;W[rd]
 ;B[re]
 ;W[pe]
 ;B[rf]LB[pc:A][pf:B]C['a' is correct. 'b' is a mistake.]
 (;W[pc]
 ;B[od]
 ;W[pb]
 ;B[og]C[End of joseki.]
 ;W[pf]C[This move is bad.]
 ;B[rg]LB[ne:B][qh:A]C['a' gives Black magnificient thickness. 'b' is a total failure.]
 (;W[qh]
 ;B[qg]
 ;W[pg]
 ;B[ph]
 ;W[oh]
 ;B[pi]
 ;W[of]
 ;B[ng]
 ;W[nf]
 ;B[mf]
 ;W[mg]
 ;B[nh]
 ;W[me]
 ;B[lf]
 ;W[ne]
 ;B[le]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kd]
 ;W[mc]
 ;B[lb]
 ;W[nb]
 ;B[mh])
 (;W[ne]
 ;B[oe]
 ;W[of]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[pg]
 ;B[oh]
 ;W[ph]
 ;B[pi]
 ;W[oi]
 ;B[nh]
 ;W[qi]
 ;B[pj]
 ;W[qh]
 ;B[qj]))
 (;W[pf]
 ;B[rg]
 ;W[pc]
 ;B[od]
 ;W[pb]
 ;B[og]TR[pf][rg]C[With the marked stones, White has made a bad exchange and wasted ko threats and endgame moves.]))
 (;B[pc]
 ;W[re]))
 (;W[lc]LB[rd:a][qe:b]C[Depending upon circumstances, Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[re]LB[qd:A][qe:B]C[
 * Joseki *
 'a' or 'b'.]
 (;B[qd])
 (;B[qe]
 ;W[rf]LB[rc:A][sd:B]C[Later, White can continue on 'a' or 'b'.]
 (;W[rc]LB[qc:A][sd:B]C['a' is right, 'b' is wrong.]
 (;B[qc]
 ;W[sd])
 (;B[sd]
 ;W[qc]
 ;B[qd]
 ;W[ob]))
 (;W[sd]LB[rc:A][sc:B]C['a' is right, 'b' is wrong.]
 (;B[rc])
 (;B[sc]
 ;W[rc]
 ;B[se]
 ;W[qc]
 ;B[qd]
 ;W[sb]
 ;B[sd]
 ;W[ra]
 ;B[qb]C[This move is wrong, as Black cannot kill.]
 ;W[pb]
 ;B[pc]
 ;W[rb]
 ;B[pa]
 ;W[ob]))))
 (;B[qe]C[Black 5 is effective if White has an extension as shown.]
 ;W[pf]
 ;B[ne]
 ;W[re]
 ;B[rd]
 ;W[rf]C[The joseki concludes.]
 ;B[]LB[rc:b][sd:a]C[Black plays elsewhere.
 White continues with 'a'. White 'b' is mischief-making of a high order.]
 (;W[sd]LB[rc:a][sc:b]C[In yose (toward the endgame).
 Black continues with 'a'. Black 'b' leave aji.]
 (;B[rc]
 ;W[sc]
 ;B[sb]
 ;W[se]LB[qb:a][rb:b]C[Black plays at 'a' or 'b'.]
 ;B[qb])
 (;B[sc]C[Black 12 is a mistake.]
 ;W[rc]
 ;B[se]
 ;W[qc]
 ;B[qd]C[White has considerable opportunity.]))
 (;W[rc]C[White 12 is risky business. White should not be able to succeed.]
 ;B[sd]
 ;W[qc]
 ;B[qd]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]LB[ra:a][pc:b]C[White may try 'a' or 'b'. Neither should work.]
 (;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[oa]LB[rc:12][ne:7]C[White cannot live.
 After Black 7, White cannot live inside the corner, so White 12 is wrong.])
 (;W[pc]
 ;B[pa]
 ;W[oa]
 ;B[sc]
 ;W[sb]
 ;B[rb]
 ;W[ra]
 ;B[qb]))))
 (;W[qi]
 ;B[qe]
 ;W[re]
 ;B[rd]
 ;W[ql])
 (;W[od]LB[oc:B][oe:A][pe:C]C['a' is good for Black, 'b' is too submissive.
 'c' is not recommended.]
 (;B[oe]LB[qd:A][pe:B]C['a' or 'b' give Black a good result.]
 (;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[qc]
 ;B[rd]
 ;W[rf]
 ;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[ob]
 ;B[oc]
 ;W[pb]
 ;B[nb]
 ;W[ra]
 ;B[qa]
 ;W[pa]
 ;B[sb]
 ;W[sd]C[White captures the corner.]
 ;B[ph]
 ;W[rh])
 (;W[pe]
 ;B[qd]))
 (;B[oc]
 ;W[qd]LB[qc:B][pe:A]C['a' or 'b'.]
 (;B[pe]
 ;W[qe]
 ;B[qc]
 ;W[rc]
 ;B[pf]
 ;W[qb]
 ;B[pc]
 ;W[qg])
 (;B[qc]
 ;W[pe]
 ;B[pc]))
 (;B[pe]
 ;W[oc]))
 (;AB[jd]
 ;W[ld]LB[lc:B][qe:A]C['a' or 'b'.]
 (;B[qe]
 ;W[pf]
 ;B[ne])
 (;B[lc]
 ;W[oc]LB[md:A][od:B]C['a' or 'b'.]
 (;B[md]
 ;W[od]
 ;B[pe]LB[nb:B][me:A]C['a' or 'b'.]
 (;W[me]
 ;B[pf])
 (;W[nb]
 ;B[pf]
 ;W[qc]
 ;B[qg]))
 (;B[od]
 ;W[kc]LB[mc:A][kd:B]C['a' or 'b'.]
 (;B[mc]
 ;W[kd]
 ;B[qd])
 (;B[kd]
 ;W[mc]LB[lb:B][md:A]C['a' is correct, 'b' is getting tricked..]
 (;B[md]
 ;W[lb]
 ;B[le]
 ;W[nb]
 ;B[nd]LB[lc:A][pc:B]C['a' or 'b'.]
 (;W[lc]
 ;B[ob]
 ;W[pc]
 ;B[na]
 ;W[mb]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[oa]
 ;B[qi])
 (;W[pc]
 ;B[lc]
 ;W[mb]
 ;B[qc]
 ;W[qb]
 ;B[qd]))
 (;B[lb]
 ;W[nd]
 ;B[nb]
 ;W[mb]
 ;B[ma]
 ;W[md]LB[kb:B][ob:A]C['a' or 'b' don't help.]
 (;B[ob]
 ;W[kb]
 ;B[la]
 ;W[na]
 ;B[oa]
 ;W[pc]
 ;B[pb]
 ;W[qc]
 ;B[qb]
 ;W[qd]
 ;B[jc]
 ;W[oe])
 (;B[kb]
 ;W[ob]
 ;B[na]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hc]
 ;B[pc]
 ;W[hb]
 ;B[pb]
 ;W[mf]))))))
 (;W[pj]
 ;B[rd]C[Later]
 ;B[rf]C[Later]
 ;W[qe]
 ;B[re]
 ;W[rg]C[Later]
 ;W[qd]
 ;B[qc]
 ;W[pc]C[Asking move]
 ;B[pb]
 ;W[rc]
 ;B[qb]
 ;W[sd]
 ;B[rb]
 ;W[sb]C[Ko]))
 (;B[mc]LB[ob:e][kc:c][lc:d][pc:g][qc:a][rc:f][od:i][qd:b][rd:h][pj:j]C[
 Large Knight's Move = Oogeima = Nunmokcha = Da` Fei
 ----------------------------------------------------
 White continues with 'a', 'b', 'c', 'd', 'e' to 'g' or 'j'. White 'd', the nose contact play, is a trick play.
 Black 3 is the most complicated answer to the White approach.
 To avoid all variations, players who don't know them treat the position as if Black had played the keima instead and continue on 'h'. This involves only a minor loss of territorial balance for sake of simplicity.
 'i' is a mistake.
 d4, c3, b2, a1
+]
 (;W[qc]LB[pc:b][qd:a]C[Black 3 attempts to take the corner area. White attempts to prevent that with 4.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qd]LB[pc:a][rd:b]C[White continues with 'a' or 'b'.]
 (;W[pc]LB[oc:b][rc:c][od:a][rd:d]C[Black continues with 'a'. Black 'b' is not recommended.
 'c' starts a fight.
 'd' is bad.]
 (;B[od]LB[nb:B][ob:C][oc:A][rd:D]C['a' gives Black the choice, 'b' the top side.
 White 'C' takes the corner.
 'd' was once joseki, but is now seen as disadvantageous.
+]
 (;W[oc]LB[nc:b][rc:c][rd:a]C[Black continues with 'a' for the right side or 'b' for the top side.
 'c' is unfavorable.]
 (;B[rd]LB[mb:b][nc:a]C[
 White continues with 'a' or 'b'.]
 (;W[nc]LB[md:B][nd:A]C['a' is joseki. 'b' is questionable.]
 (;B[nd]LB[mb:A][md:B]C['a' is correct, 'b' is disadvantageous.]
 (;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]LB[kb:A][qi:B]C[
 White continues with 'a'. White 'b' and all other extensions on the right side are disadavantageous.]
 (;W[kb]LB[jc:D][pi:A][pj:C][qj:B]C[
 * Joseki *
 'a' is correct, 'b', 'c' and 'd' are not recommended.]
 (;B[pi]
 ;W[qk]
 ;B[ok]
 ;W[qi]
 ;B[ph]
 ;W[qh]
 ;B[pg]
 ;W[pm]
 ;B[jc])
 (;B[qj]LB[jc:B][pi:A]C['a' is correct, 'b' helps Black.]
 (;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[rh]
 ;W[of])
 (;W[jc]
 ;B[le]))
 (;B[pj]
 ;W[oi]
 ;B[pi]
 ;W[og])
 (;B[jc]
 ;W[pj]))
 (;W[qi]C[The result is not unfavorable for Black so much as a wasted opportunity.]
 ;B[kb]
 ;W[rc]
 ;B[qk]C[Having no secure base, the White group is now a target for attack.]))
 (;W[md]C[White 12 provokes an unfavorable fight.]
 ;B[mb]
 ;W[rc]
 ;B[kc]
 ;W[me]
 ;B[of]
 ;W[ke]
 ;B[jd]LB[nb:A][ph:B]
 (;W[nb]C[White must play 20 to live in the corner.])
 (;W[ph]C[Any move other than preserving life in the corner is a mistake.
 White 20 is exemplary. White must play in the corner to preserve life, or the game is forfeit.]
 ;B[oa]
 ;W[pa]
 ;B[na]
 ;W[ob]
 ;B[qb]
 ;W[rb]
 ;B[sc]
 ;W[sb]
 ;B[ra]C[White dies.])))
 (;B[md]LB[rc:b][nd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[ne]LB[rc:a][me:c][oe:b]C[White continues with 'a'. White 'b' and 'c' are not recommended.]
 (;W[rc]LB[me:b][of:a]C[Black continues with 'a' or 'b'. Black sacrifices four stones with 'b'. Black 'b' is suitable for a handicap game, where Black tries to avoid complications.]
 (;B[of]LB[me:B][qi:A]C['a' or 'b'.]
 (;W[qi]
 ;B[lf])
 (;W[me]
 ;B[kd]
 ;W[mf]
 ;B[pg]
 ;W[qh]
 ;B[pi]LB[mb:a]C[Black 'a' is sente.]
 ;W[qi]
 ;B[pj]))
 (;B[me]
 ;W[oe]
 ;B[of]
 ;W[pe]
 ;B[pf]
 ;W[qe]
 ;B[qg]
 ;W[re]
 ;B[rf]
 ;W[sd]
 ;B[ph]))
 (;W[oe]C[White 14 is not recommended.]
 ;B[rc]
 ;W[rb]
 ;B[of]
 ;W[pe]
 ;B[qb]
 ;W[pb]
 ;B[pf]
 ;W[qe]
 ;B[qg]
 ;W[nf]
 ;B[me]
 ;W[pg]
 ;B[og]
 ;W[rg]
 ;B[ph]LB[rf:a][qh:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rf]
 ;B[rh]
 ;W[se]C[White wins the fight, but Black has sente and strong thickness.])
 (;W[qh]C[White 30 loses the game.]
 ;B[rf]C[Black challenges White to a ko]
 ;W[pg]
 ;B[sb]C[Black makes a ko threat.]
 ;W[qg]C[White has no ko threats, so must connect.]
 ;B[ra]C[Black captures the corner, giving Black the game.]
 ;W[oh]
 ;B[ng]
 ;W[pi]
 ;B[mg]))
 (;W[me]C[White 14 is not recommended.]
 ;B[rc]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[kc]
 ;W[rb]
 ;B[nf]
 ;W[pf]
 ;B[of]
 ;W[le]
 ;B[kd]
 ;W[lg]
 ;B[ph]
 ;W[qh]
 ;B[pi]
 ;W[qi]
 ;B[pj]))
 (;W[rc]C[White 12 is a mistake.]
 ;B[nd]C[Black has tremendous thickness.])))
 (;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[rc]
 ;B[of]))
 (;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[of]
 ;B[nf]
 ;W[og]
 ;B[mf]
 ;W[pk]
 ;B[id])
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[nc]
 ;B[nd]
 ;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[ld]
 ;W[kc]
 ;B[qj]
 ;W[pi]C[Black has nothing.]
 ;B[nb]LB[rb:10]C[Later, Black can capture White 10.]
 ;W[la]
 ;B[qb]
 ;W[pb]
 ;B[ra]
 ;W[qa]
 ;B[sb]LB[na:A][sa:B]C['a' is correct, 'b' is unnecessary.]
 (;W[na]
 ;B[qb]
 ;W[pa])
 (;W[sa])))
 (;W[nb]LB[mb:b][nc:a]C[An artful move by White. Black continues with 'a'. Black 'b'is a mistake.]
 (;B[nc]LB[mb:a][rd:b]C[White continues with 'a' or 'b'.]
 (;W[mb]
 ;B[lb]LB[lc:b][oc:a]C[White continues with 'a'. White 'b' is a trick play.]
 (;W[oc]
 ;B[lc]LB[rd:a][of:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]LB[of:a][rf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[of]
 ;B[nf]LB[ng:b][og:a]C[
 * Joseki *
 Black attaches at 19 not because of the cut at between Black 7 and 9, but to prevent the peep in front of the cut.
 White continues with 'a' or 'b'.]
 (;W[og]
 ;B[mf])
 (;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lg]LB[lf:B][oh:A]
 (;W[oh]
 ;B[kf])
 (;W[lf]
 ;B[og]
 ;W[oh]
 ;B[pg])))
 (;W[rf]C[White 18 is a mistake.]
 ;B[sf]
 ;W[qi]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[of]
 ;B[nf]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[ng]))
 (;W[of]C[White 14 is premature.]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]LB[ne:b][nf:a]C[Black continues with 'a' or 'b'.]
 (;B[nf]
 ;W[og]
 ;B[mf])
 (;B[ne]
 ;W[ng]
 ;B[nf])))
 (;W[lc]LB[ob:b][ld:a]C[White 12 is a trick play. Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ld]
 ;W[kc]
 ;B[ob]
 ;W[kb]LB[oc:b][rc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]LB[md:a]C[The result favors Black.
 If White later plays 'a'....]
 ;W[md]
 ;B[nd]C[Black must play 19.])
 (;B[oc]C[Black 17 is a mistake.]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[pb]
 ;B[na]
 ;W[la]LB[pa:a]))
 (;B[ob]C[Black 13 is a mistake.]
 ;W[kb]
 ;B[ld]
 ;W[la]
 ;B[rc]
 ;W[kd]C[White gets nice shape, and a powerful ponnuki. The two corner stones are inadequate compensation.])))
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[mb]
 ;B[lb]LB[lc:b][oc:a]C[White continues with 'a', or the devious 'b'.]
 (;W[oc]
 ;B[ma]
 ;W[ob]
 ;B[ld]
 ;W[of]
 ;B[qj]
 ;W[ne]
 ;B[nd]LB[kc:b][lf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[lf]
 ;B[id])
 (;W[kc]C[White 24 is not recommended.]
 ;B[kd]C[Black starts a ko to his advantage.]
 ;W[lc]
 ;B[jc]
 ;W[kb]
 ;B[id]
 ;W[me]
 ;B[ka]
 ;W[la]
 ;B[pf]
 ;W[pg]
 ;B[lb]
 ;W[jb]
 ;B[ib]
 ;W[la]
 ;B[qg]
 ;W[ja]
 ;B[rf]C[White center stones are now subject to profitable attack by Black.]))
 (;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[ob]
 ;W[kb]LB[na:a][pb:b]C[Black continues with 'a' or 'b'. Black 'b' leads to ko, but to Black's advantage.]
 (;B[na]
 ;W[la]
 ;B[oc]
 ;W[pb]LB[oa:C][pa:A][sd:B]C['a' is correct and brings a ko. 'b' and 'c' are wrong.]
 (;B[pa]
 ;W[qa]
 ;B[ra]
 ;W[oa])
 (;B[sd]
 ;W[pa]
 ;B[oa]
 ;W[rb]
 ;B[qa]
 ;W[ra])
 (;B[oa]
 ;W[rb]
 ;B[qa]
 ;W[pa]
 ;B[sd]
 ;W[ra]))
 (;B[pb]C[Black 21 requires a ko, but Black gains a huge advantage.]
 ;W[oc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[oa]
 ;B[qa]
 ;W[sc]LB[sa:B][se:A]C['a' is correct. 'b' loses points on the outside to risk more points in the ko inside.]
 (;B[se]
 ;W[sa]
 ;B[sb])
 (;B[sa]
 ;W[se]
 ;B[rf]
 ;W[la]
 ;B[na]
 ;W[ma]
 ;B[sf]
 ;W[na]
 ;B[sd])))))
 (;B[mb]
 ;W[nc]
 ;B[nd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[md]
 ;B[kc]C[The result is not unfavorable to Black, but in a handicap game, White has scope for further trickery.]
 ;W[pf]))
 (;W[ob]LB[nb:b][rd:a]C[White hopes for a Black mistake with this move. Black replies with 'a'. Black 'b' is not recommended.]
 (;B[rd]LB[mb:a][nc:c][rc:b]C[Black 9 is correct.
 White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]LB[kb:B][qi:A]
 (;W[qi]LB[kb:a][rb:b][oc:B]C[White is low. Black can press with 'a' or 'b'.]
 (;B[kb]LB[nc:A][dp:B]C[White must play 'a'. Tenuki 'b' is wrong.]
 (;W[nc]
 ;B[nd]
 ;W[rc])
 (;W[]C[White plays elsewhere, a fatal mistake.]
 ;B[rb]
 ;W[rc]
 ;B[sc]
 ;W[qb]
 ;B[pa]
 ;W[qa]
 ;B[oc]
 ;W[nb]
 ;B[la]))
 (;B[oc]
 ;W[nb]
 ;B[rb]
 ;W[qb]
 ;B[qa]
 ;W[pa]
 ;B[ra]
 ;W[rc]
 ;B[sc]
 ;W[pb]
 ;B[sb]
 ;W[kb]
 ;B[jc]))
 (;W[kb]C[White 14 is not recommended.]
 ;B[qi]
 ;W[og]
 ;B[jc]C[The two White stones will be battered.]))
 (;W[rc]
 ;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[of]
 ;B[ne]C[
 * Joseki *
 White's corner is not completely alive, but that doesn't matter.]
 ;W[dp]C[White plays elsewhere.]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[qa]
 ;W[oa]
 ;B[sa]
 ;W[sc]LB[na:A][ra:B]C[This ten-thousand-year ko will become seki.
 If Black starts the ko on 'a', it is unfavorable for him. So Black will make a seki on 'b'.
 White has not much interest to start the ko on 'b'.]
 (;B[na]
 ;W[ra]
 ;B[as]
 ;W[bs]
 ;B[sa]
 ;W[pp]
 ;B[sd]
 ;W[ra]
 ;B[ar]
 ;W[br]
 ;B[sa]
 ;W[dd]
 ;B[pa]
 ;W[ra]
 ;B[aq]
 ;W[bq]
 ;B[sa]
 ;W[dj]
 ;B[pb]
 ;W[pj]C[Black lost three ko threats, while White did get five moves elsewhere.])
 (;B[ra])
 (;W[ra]
 ;B[pp]
 ;W[pa]
 ;B[sa]
 ;W[as]
 ;B[bs]
 ;W[ra]
 ;B[dd]
 ;W[pb]C[Whitre lost a ko threat, while Black got one move more elsewhere.]))
 (;W[nc]C[White 10 is a mistake. Further, White 10 leaves White in gote.]
 ;B[nd]
 ;W[md]
 ;B[mb]
 ;W[rc]
 ;B[kc]
 ;W[me]
 ;B[of]LB[ra:a][dp:b]C[White must play in the corner to survive, such as 'a'. White cannot afford to play elsewhere 'b'.]
 (;W[ra]C[White must play in the corner to live.])
 (;W[dp]C[White plays elsewhere, and the White stones in the corner can be killed.]
 ;B[oc]
 ;W[nb]
 ;B[na]
 ;W[pa]
 ;B[sc]
 ;W[sb]
 ;B[ra]
 ;W[sd]
 ;B[rf]
 ;W[qa]
 ;B[ma])))
 (;B[nb]
 ;W[oc]
 ;B[nd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[of]
 ;B[nf]C[Black is dissatisfied with the result because White's corner is secure.]))
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]LB[nb:b][ob:c][oc:a]C[White continues with 'a'.
 White 'b' and 'c' are not recommended.
+]
 (;W[oc]LB[nc:B][rd:8][pf:A]C['a' brings a fight which is good for Black, what is the punishment for White 8, 'b' aims for the top side.
+]
 (;B[pf]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[lc]
 ;W[me]
 ;B[jd]C[
 ])
 (;B[nc]LB[ne:b][of:a][pf:c]C[White continues with 'a'.
 White 'b' only looks right; it is a reducing move for the later stage of the game.
 White 'c' is heavy.
+]
 (;W[of]LB[ob:b][nf:a][pg:d][qg:c][dp:e]C[Black continues with 'a'. Black 'b' to 'd' are not recommended.
 'e' shows Black playing elsewhere.]
 (;B[nf]LB[ne:c][ng:b][og:a]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[og]LB[ne:B][mf:A]C['a' concludes the sequence once seen as joseki. 'b' is possible.
+]
 (;B[mf]
 ;W[dp]LB[ma:E][na:D][mb:C][nb:B][ob:A]C['a' to 'e' are sente.]
 (;B[ob]
 ;W[pb]LB[na:B][nb:A]C['a' or 'b'.]
 (;B[nb]LB[ra:A][rf:B]C[White immediately lives on 'a' or first forces on 'b' before living.]
 (;W[ra])
 (;W[rf]LB[ob:19]C[Black must know he provokes this White move with 19.]
 ;B[se]
 ;W[ra]))
 (;B[na]
 ;W[rb]
 ;B[qa]
 ;W[pa]LB[ra:B][sd:A]C[Neither 'a' nor 'b' kill.]
 (;B[sd]
 ;W[ra]
 ;B[sc]
 ;W[sb])
 (;B[ra]
 ;W[sd]
 ;B[sb]
 ;W[qb]
 ;B[sa]
 ;W[sc]
 ;B[ra]
 ;W[sa]
 ;B[sb]
 ;W[qa]
 ;B[oa]
 ;W[sa])))
 (;B[nb]
 ;W[ob])
 (;B[mb]
 ;W[ob])
 (;B[na])
 (;B[ma]LB[ob:A][pp:B]C['a' is necessary. 'b' results in ko.]
 (;W[ob])
 (;W[pp]
 ;B[oa]LB[pa:A][ra:B][sb:C]C['a' leads to ko; 'b' or 'c' to death.]
 (;W[pa]
 ;B[ra]
 ;W[ob]
 ;B[na]
 ;W[sd]LB[qa:B][pb:A]C['a' ko, 'b' seki.]
 (;B[pb]
 ;W[qb]
 ;B[qa])
 (;B[qa]
 ;W[pb]
 ;B[sb]
 ;W[rb]))
 (;W[ra]
 ;B[pa]
 ;W[sb]
 ;B[qb]
 ;W[rb]
 ;B[sd])
 (;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[qb]))))
 (;B[ne]LB[jc:b][dp:a]C[White may play elsewhere ('a'), or thwart Black with 'b'.]
 ;W[jc]
 ;B[mh]
 ;W[ni]
 ;B[mi]
 ;W[]C[White plays elsewhere.]
 ;B[nj]
 ;W[pj]))
 (;W[ng]
 ;B[mf]LB[rf:b][mg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mg]LB[lf:b][rf:g][lg:a][og:c][pg:d][qg:f][rg:e]C[Black continues with 'a'. Black 'b' to 'g' are not recommended.
 g7,f6,e5,d4,c3,b2,a1]
 (;B[lg]LB[lf:b][oh:a]C[White continues with 'a' or 'b'.]
 (;W[oh]
 ;B[kf])
 (;W[lf]LB[le:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[oh]
 ;B[pg]
 ;W[pf]LB[le:B][ph:A]C[Black continues with 'a' or 'b'.]
 (;B[ph]
 ;W[pi]LB[rg:c][qh:b][oi:a]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[oi]
 ;W[qh]
 ;B[nh]
 ;W[mh]
 ;B[qi]LB[ne:a][qg:b]C[White continues with 'a'. The obvious White 'b' is a mistake.]
 (;W[ne]
 ;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[nd]
 ;B[oe]
 ;W[kd]
 ;B[jd]
 ;W[lb]C[White 43 contains the two Black stones, which retain aji.]
 ;B[pj]
 ;W[rf]
 ;B[je]
 ;W[lh]
 ;B[jh])
 (;W[qg]C[White 32 is a mistake.]
 ;B[pj]
 ;W[ne]
 ;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[nd]
 ;B[oe]
 ;W[kd]
 ;B[jd]
 ;W[lb]
 ;B[sh]C[Black 45 allows connection. White loses.]))
 (;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[rf]
 ;B[se]
 ;W[oi]
 ;B[ri]
 ;W[lh]
 ;B[kg]
 ;W[ne]
 ;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[nd]
 ;B[oe]
 ;W[kd]
 ;B[jd]
 ;W[lb]
 ;B[sf]
 ;W[mi]
 ;B[ie]
 ;W[jb])
 (;B[rg]C[Black 27 is a mistake.]
 ;W[rf]
 ;B[sf]
 ;W[qg]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[ne]
 ;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[nd]
 ;B[oe]
 ;W[sg]
 ;B[kd]
 ;W[qj]))
 (;B[le]
 ;W[ph]
 ;B[kf]))
 (;B[le]
 ;W[kf]
 ;B[og]
 ;W[oh]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[lh])))
 (;B[lf]C[Black 19 is not recommended.]
 ;W[lg]
 ;B[kf]
 ;W[rf]
 ;B[sf]
 ;W[rh])
 (;B[og]C[Black 19 is not recommended.]
 ;W[oh]
 ;B[pg]
 ;W[ph]LB[pf:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[lg])
 (;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[lg]))
 (;B[pg]C[Black 19 is not recommended, as Black ignores the top for the right.]
 ;W[ph]LB[oh:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[oh]
 ;W[og]
 ;B[qh]LB[pf:a][pi:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pf]
 ;B[rg]
 ;W[rf]
 ;B[sf]
 ;W[qg]
 ;B[pi])
 (;W[pi]C[White 24 is not recommended.]
 ;B[qg]
 ;W[ni]
 ;B[qi]
 ;W[pj]))
 (;B[qh]
 ;W[qg]
 ;B[pf]
 ;W[og]
 ;B[pe]
 ;W[qi]
 ;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[oi]))
 (;B[rg]C[Black 19 is not recommended, as Black ignores the top for the right.]
 ;W[lf]
 ;B[ld]
 ;W[kh])
 (;B[qg]C[Black 19 is not recommended.]
 ;W[rf]
 ;B[rg]
 ;W[sf]
 ;B[pf]
 ;W[pg]LB[oe:a][pe:b]C[Black may try 'a' or 'b'.]
 (;B[oe]
 ;W[pe]C[Now Black must find a ko; there is unlikely to be one big enough.])
 (;B[pe]
 ;W[se]
 ;B[oe]
 ;W[og]
 ;B[qi]
 ;W[lf]
 ;B[me]
 ;W[le]
 ;B[md]
 ;W[kh]
 ;B[ql]
 ;W[kc]))
 (;B[rf]C[Black 19 is not recommended.]
 ;W[qg]
 ;B[rg]
 ;W[qi]
 ;B[qh]
 ;W[ph]
 ;B[rh]
 ;W[pi]))
 (;W[rf]C[White 18 is a mistake.]
 ;B[sf]
 ;W[rh]
 ;B[mg]
 ;W[nh]
 ;B[mh]
 ;W[ni]
 ;B[lj]))
 (;W[ne]C[White 16 is a mistake.]
 ;B[me]
 ;W[oe]
 ;B[nd]LB[mf:a][og:b]C[White may try 'a' or 'b'.]
 (;W[mf]
 ;B[ng]
 ;W[le]
 ;B[md]
 ;W[og]
 ;B[lf]
 ;W[mg]
 ;B[nh]
 ;W[oh]
 ;B[ni])
 (;W[og]
 ;B[ic])))
 (;B[ob]C[Black 15 gives White a reasonable position in the center, while overconcentrating low.]
 ;W[pb]
 ;B[nb]
 ;W[ne]
 ;B[nd]
 ;W[rf]
 ;B[sf]
 ;W[sd]
 ;B[se]
 ;W[rh])
 (;B[qg]C[Black 15 is not recommended.]
 ;W[rf]
 ;B[rg]
 ;W[sf]
 ;B[pf]
 ;W[pg]
 ;B[pe]
 ;W[se]
 ;B[ne]
 ;W[qh]
 ;B[rh]
 ;W[qi])
 (;B[pg]C[Black 15 is not recommended.]
 ;W[pf]
 ;B[rg]
 ;W[rf]
 ;B[sf]
 ;W[qg]
 ;B[rh]
 ;W[pi]
 ;B[qj]
 ;W[ne]
 ;B[nd]
 ;W[ke])
 (;B[]C[Black plays elsewhere.]
 ;W[ne]
 ;B[nd]
 ;W[le]))
 (;W[ne]LB[nd:b][pf:a]C[White 14 should be prepared well by White in the center.
 Black continues with 'a'. Black 'b' is submissive.]
 (;B[pf]
 ;W[nd]
 ;B[kd]
 ;W[pg]
 ;B[qg]
 ;W[of]
 ;B[rf]
 ;W[ph]
 ;B[qi]C[Under normal circumstances the White stones are heavy.])
 (;B[nd]C[Black 15 is weak.]
 ;W[of]C[Good for White.]))
 (;W[pf]C[White 14 is a heavy move, rather obviously bad.]
 ;B[ne]
 ;W[rf]
 ;B[sf]
 ;W[rh]
 ;B[ng]C[White is low, and Black has good influence.])))
 (;W[nb]LB[nc:b][pf:a]C[White 12 is not recommended.
 Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[nc]
 ;B[nd]LB[lc:b][md:a]C[White 'a' is tough, but Black has the advantage in the fight ahead. White 'b' gives White a bit of territory while giving Black imposing thickness.]
 (;W[md]
 ;B[lc]
 ;W[me]
 ;B[jd]
 ;W[mg]
 ;B[ph])
 (;W[lc]
 ;B[ld]
 ;W[mb]
 ;B[kd]
 ;W[md]
 ;B[me]))
 (;B[nc]
 ;W[mb]
 ;B[lb]
 ;W[oc]
 ;B[lc]))
 (;W[ob]
 ;B[pf]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[lc]
 ;W[me]
 ;B[nb]
 ;W[oc]
 ;B[jd])))
 (;B[oc]LB[ob:c][rc:a][rd:b][dp:d]C[Black 7 is asking for trouble.
 White continues with 'a' or 'b'.
 White 'c' is not recommended, and certainly lacks fighting spirit.]
 (;W[rc]
 ;B[rd]
 ;W[od]
 ;B[oe]
 ;W[nd]LB[nc:b][ne:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne]LB[nc:a][md:b]C[White continues with 'a' to take the corner, or 'b' if the ladder is favorable.]
 ;W[nc]LB[pe:a]C[White has life in the corner, and Black must still defend against the cut at 'a'.])
 (;B[nc]
 ;W[ne]
 ;B[pf]
 ;W[of]
 ;B[pe]
 ;W[ob]
 ;B[nb]
 ;W[pa]C[The sequence concludes.]
 ;B[sc]C[Black should not play here immediately, but this illustrates how White lives in the corner.]
 ;W[sb]
 ;B[sd]
 ;W[qb]))
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]LB[ob:b][od:a][rf:c]C[White continues with the strong cut of 'a', or 'b'.
 White 'c' has complex variations.]
 (;W[od]LB[oe:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]LB[ob:b][oe:a][qg:c]C[White continues with 'a'. White 'b' and 'c' are not recommended.]
 (;W[oe]
 ;B[ob]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[rh]LB[pb:b][qi:a]C[White continues with 'a'.
 White 'b' is not recommended, as the White center stones come under profitable attack by Black.]
 (;W[qi]
 ;B[pb]
 ;W[me]
 ;B[kd]
 ;W[ri]
 ;B[]C[Black plays elsewhere.
 The White stones in the corner are still a liberty behind.]
 ;W[qb]
 ;B[ra]
 ;W[qa]
 ;B[se]
 ;W[sh]
 ;B[sd])
 (;W[pb]C[White 20 revives the corner stones, but at too high a price.]
 ;B[qi]
 ;W[og]
 ;B[me]
 ;W[oi]
 ;B[pk]))
 (;W[ob]C[White 14 is an overplay.]
 ;B[nc]
 ;W[oe]
 ;B[qg]
 ;W[jc]
 ;B[me]
 ;W[nf]
 ;B[mf]
 ;W[nh]
 ;B[qj]C[Black makes profit at the right. The Black stones at top are in no real danger.])
 (;W[qg]C[White 14 results in White losing the corner.]
 ;B[oe]
 ;W[nd]
 ;B[ob]
 ;W[md]
 ;B[lc]
 ;W[nf]
 ;B[rg]
 ;W[qh]
 ;B[rh]
 ;W[qi]
 ;B[pb]))
 (;B[oe]
 ;W[nd]
 ;B[nc]
 ;W[md]
 ;B[rf]
 ;W[lc]
 ;B[lb]
 ;W[nf]LB[pb:a][kc:b]C[Black continues with 'a', taking the corner.
 Black 'b' emphasizes the top, at the sacrifice of the White stones in the corner being able to live.]
 (;B[pb]
 ;W[kb]
 ;B[nb]
 ;W[la]
 ;B[mb]
 ;W[kc]
 ;B[rb]
 ;W[qg])
 (;B[kc]
 ;W[ld]
 ;B[nb]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[rh]
 ;W[kd]
 ;B[jc]
 ;W[pb]
 ;B[qi]C[White must play in the corner, such as shown or risk death.]MA[ra]
 ;W[]C[White plays elsewhere.]
 ;B[sd]LB[oa:a][ra:c][rb:b]C[At best, White can get a ko with 'a'.]
 (;W[oa]
 ;B[rb]
 ;W[sb]
 ;B[qa]
 ;W[ra])
 (;W[rb]
 ;B[qa]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pa])
 (;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[rb]
 ;W[ob]
 ;B[oa]
 ;W[pa]
 ;B[mb]))))
 (;W[ob]LB[nc:a][nd:b][od:c]C[Black continues with 'a' or 'b'.
 Black 'b' is in preparation for an extension down the right side.
 Black 'c' is slow.]
 (;B[nc]LB[of:b][rf:a]C[White continues with 'a'. White 'b' sacrifices the corner.]
 (;W[rf]
 ;B[sf]
 ;W[of]
 ;B[oe]
 ;W[nf]
 ;B[nb]
 ;W[pb]
 ;B[jc]
 ;W[rh])
 (;W[of]C[White 14 is an overplay that sacrifices the corner.]
 ;B[oe]
 ;W[nf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[sf]
 ;B[pf]
 ;W[pg]
 ;B[se]
 ;W[pe]
 ;B[pb]
 ;W[pf]
 ;B[qb]))
 (;B[nd]LB[nb:a][oe:b]C[Black 13 intends for an extension down the right side.
 White continues with 'a', or 'b' to thwart Black on the right.]
 (;W[nb]
 ;B[qj])
 (;W[oe]C[White 14 is an attempt for White to continue to have a say on the right side, at the expense of the top.]
 ;B[od]
 ;W[qi]
 ;B[nb]
 ;W[pb]
 ;B[pf]))
 (;B[od]C[Black 13 is not recommended as being slow.]
 ;W[nb]
 ;B[me]))
 (;W[rf]LB[oe:a][sf:b]C[White 12 aims to cut at between Black 1 and 7.]
 (;B[oe]
 ;W[se])
 (;B[sf]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[nc]
 ;W[md]LB[ld:b][of:a]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[ld]
 ;B[lc]
 ;W[kc]
 ;B[kb]
 ;W[nf]
 ;B[og]
 ;W[jb]
 ;B[la]
 ;W[jd]
 ;B[pb]
 ;W[qb]
 ;B[pa]
 ;W[sd]
 ;B[se]
 ;W[sb])
 (;B[ld]
 ;W[nf]
 ;B[of]
 ;W[lc]
 ;B[lb]
 ;W[le]LB[kc:a][kd:c][og:b]C[White 'a' and 'c' sacrifice the Black stones at right.
 Black 'b' keeps the stones at least temporarily alive, but under attack.]
 (;B[kc]C[Black sacrifices the stones at right for a clean result.]
 ;W[pf]
 ;B[pe]
 ;W[og])
 (;B[og]
 ;W[kd]
 ;B[kb]
 ;W[ob]
 ;B[nb]
 ;W[na]
 ;B[mb]
 ;W[qb]
 ;B[ic]
 ;W[oi])
 (;B[kd]LB[ke:a][pf:b]C[Black takes a larger territory on top, and gives up a larger territory at the right, compared to Black 25 played onto the marked point.
 White continues with 'a'. White 'b' is an overplay that sets up a ladder that ends the game, unless White has a ladder break to the lower left.]MA[kc]
 (;W[ke]
 ;B[ng]
 ;W[ne]
 ;B[mf]
 ;W[me]
 ;B[je]
 ;W[kf]
 ;B[jf]
 ;W[kg]
 ;B[jd]
 ;W[pf])
 (;W[pf]C[White 26 is a mistake unless White has a ladder break to the lower left.]
 ;B[pe]
 ;W[og]
 ;B[rg]
 ;W[qh]
 ;B[ng]
 ;W[ne]
 ;B[se]
 ;W[qg]
 ;B[mf]
 ;W[me]
 ;B[lf]))))))
 (;W[ob]LB[nc:a][nd:b]C[White 8 is a weak move.
 Black continues with 'a' or 'b'.]
 (;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]LB[oe:b][pf:a]C[White continues with 'a' or 'b'.]
 (;W[pf]
 ;B[oe])
 (;W[oe]
 ;B[pf]
 ;W[od]
 ;B[qg]
 ;W[me]
 ;B[nb]
 ;W[pa]
 ;B[jc]C[Black dropping to the first line from 19 is sente; for the White stones in the corner to live, White must play at a 1-2 point.]MA[na]))
 (;B[nd]
 ;W[nb]
 ;B[rc]
 ;W[rb]
 ;B[qi]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[qe])))
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[nc]
 ;B[oc]
 ;W[ob]
 ;B[od]
 ;W[nb]
 ;B[nd]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc])
 (;B[rd]C[Mistake.
+]
 ;W[nc]LB[nd:A][od:B]C['a' is trying to enclose White, 'b' is enclosed by White.
+]
 (;B[nd]
 ;W[od]
 ;B[oe]C[Black has too many cuts.
+]
 ;W[oc]LB[ne:A][pf:B]C['a' saves something on the top, 'b' on the right, but Black has no chance to get a good result.
+]
 (;B[ne]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]LB[pe:B][pf:A]C['a' is correct. 'b' is a mistake.
+]
 (;W[pf]LB[rd:7]C[Punishment of Black 7.
+]
 ;B[pe]
 ;W[pj])
 (;W[pe]C[Mistake.
+]
 ;B[pf]
 ;W[qe]
 ;B[qg]
 ;W[pg]
 ;B[rf]
 ;W[of]
 ;B[re]
 ;W[pf]
 ;B[qh]))
 (;B[pf]
 ;W[md]
 ;B[ne]
 ;W[lc]
 ;B[mb]
 ;W[lb]))
 (;B[od]
 ;W[nd]
 ;B[oc]
 ;W[ob]LB[nb:B][pb:A]C['a' or 'b' don't avoid being enclosed.
+]
 (;B[pb]
 ;W[nb]
 ;B[qb]
 ;W[nf])
 (;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[qb]
 ;W[nf]))))
 (;W[rd]LB[pc:B][re:A]C['a' is joseki, 'b' is questionable.]
 (;B[re]LB[rb:A][rc:B]C['a' is joseki, 'b' a variation.]
 (;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[pc]
 ;W[pb]
 ;B[mb]
 ;W[nb]
 ;B[na]
 ;W[ob]
 ;B[kc]
 ;W[me]
 ;B[pf]C[
 * Joseki *])
 (;W[rc]
 ;B[qe]
 ;W[ob]LB[oc:A][nd:C][pf:B]C['a' leads to a moyo for Black, 'b' is inferior.
 If Black plays elsewhere, White will later aim at 'c']
 (;B[oc]
 ;W[nb]LB[mb:B][nc:A]C['a' is correct. 'b' is a mistake.]
 (;B[nc]
 ;W[mb]
 ;B[qj])
 (;B[mb]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[kc]
 ;W[of]))
 (;B[pf]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[mb])))
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]LB[pb:B][jc:A]C['a' is now big for both sides. If Black occupies 'a', White can live on 'b'.])))
 (;B[pc]C[Black 3 is too close to Black 5 to be effective.]
 ;W[qd]
 ;B[pe]C[Black 7 is necessary. A White hane at 7 is great for White.]
 ;W[qe]
 ;B[jc]))
 (;W[qd]
 ;B[qc]
 ;W[pc]LB[qb:d][oc:b][rc:c][od:a]C[Black continues with 'a' or 'b'. Black 'c' and 'd' are not recommended.]
 (;B[od]LB[oc:b][rc:a]C[White continues with 'a'.
 White 'b' is a trick play.]
 (;W[rc]
 ;B[qb]LB[rd:B][re:A]C['a' is correct.
 'b' is a trick play.]
 (;W[re]
 ;B[rb]LB[sb:A][lc:B]C['a' is correct, 'b' doesn't work.]
 (;W[sb]
 ;B[pb]C[
 * Joseki *])
 (;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[md]
 ;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[sc]
 ;W[rd]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[oa]
 ;B[qa]
 ;W[sb]
 ;B[sa]
 ;W[sd]
 ;B[pa]
 ;W[sb]
 ;B[ob]))
 (;W[rd]LB[pb:A][rb:B]C['a' is correct.
 'b' is getting tricked.]
 (;B[pb])
 (;B[rb]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[md]
 ;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[oc]
 ;W[ob]
 ;B[sb]
 ;W[sc]
 ;B[nc]
 ;W[qa]
 ;B[na]
 ;W[ra]
 ;B[oa]
 ;W[sa])))
 (;W[oc]LB[nd:B][qe:A][of:C]C[White 8 is a trick play.
 'a' is correct.
 'b' is getting tricked.
 There can be an additional White stone on 'c'.]
 (;B[qe]
 ;W[rd]LB[nc:c][rc:b][re:a]C[For outside influence, Black plays 'a'; for corner profit, Black 'b'.
 'c' gives White the choice.]
 (;B[re]
 ;W[rc]
 ;B[pf]LB[qb:B][nc:A]C[White cannot aim at 'a' because of the threat of Black 'b'.])
 (;B[rc]
 ;W[re]
 ;B[nc]C[Black has the corner.]
 ;W[qb]C[White 14 is futile.]
 ;B[rb]
 ;W[nb]
 ;B[mb]
 ;W[pb]LB[qa:b][ra:a]C[Black continues with 'a'.
 'b' is a mistake.]
 (;B[ra]
 ;W[sc]
 ;B[pa]
 ;W[sb]
 ;B[qa]
 ;W[ob]
 ;B[na])
 (;B[qa]
 ;W[ra]
 ;B[sa]
 ;W[oa]
 ;B[sc]
 ;W[sd]
 ;B[ma]
 ;W[pa]
 ;B[na]
 ;W[ra]C[Ko]))
 (;B[nc]LB[qb:A][re:B]C[White takes the corner on 'a' or the outside on 'b'.]
 (;W[qb]
 ;B[re]
 ;W[rc])
 (;W[re])))
 (;B[nd]
 ;W[qb]
 ;B[rc]
 ;W[rd]
 ;B[rb]
 ;W[pb]
 ;B[ra]
 ;W[nb]
 ;B[mb]
 ;W[qa]
 ;B[nc]
 ;W[sc]
 ;B[oa]
 ;W[sb]
 ;B[ob]
 ;W[sa])
 (;AW[of]LB[ob:A][nc:C][qe:B]C['a' is correct.
 'b' is possible.
 'c' is getting tricked.]
 (;B[ob]LB[nb:D][pb:A][qb:B][nc:C]C[Neither 'a', nor 'b', nor 'c', nor 'd' help.]
 (;W[pb]
 ;B[qb])
 (;W[qb]
 ;B[rc])
 (;W[nc]
 ;B[nd])
 (;W[nb]
 ;B[nc]))
 (;B[qe]
 ;W[rd]LB[nc:A][rc:B]C['a' is correct.
 'b' is getting tricked.]
 (;B[nc]
 ;W[qb]
 ;B[re]
 ;W[rc]
 ;B[pf]
 ;W[pg]
 ;B[pe]
 ;W[og]
 ;B[ne])
 (;B[rc]LB[nd:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;W[nd]
 ;B[re]
 ;W[pe]
 ;B[sd]
 ;W[qd]
 ;B[rd]
 ;W[oe]
 ;B[qd]
 ;W[nc])
 (;W[re]
 ;B[nc])))
 (;B[nc]
 ;W[qb]
 ;B[rc]
 ;W[pe]
 ;B[ne]
 ;W[rb]))))
 (;B[oc]
 ;W[pb]
 ;B[qe]LB[rd:A][pe:B]C[White continues with 'a'. 'b' is a mistake, leads to a furikawari disadvantageous in territory.]
 (;W[rd]
 ;B[pe]LB[ob:B][re:A]C[White continues with 'a', 'b' is a mistake.]
 (;W[re]
 ;B[qb]LB[ob:B][pf:A]C[White continues with 'a'.]
 (;W[pf]
 ;B[ob]LB[of:A][qj:B]C[If White 'a' or 'b' next, Black plays elsewhere.])
 (;W[ob]
 ;B[nb]
 ;W[od]LB[pa:A][nc:C][oe:B]C[Black plays 'a', if the ladder is favorable, 'b' if not.
 Black 'c' is a mistake.]
 (;B[pa]
 ;W[nc]
 ;B[oa]
 ;W[oc]
 ;B[oe]C[The ladder to capture the Black stones starts.])
 (;B[oe]
 ;W[nc]
 ;B[nd]
 ;W[rb]
 ;B[oc]
 ;W[rc]C[
 * Joseki *
 Equal result.])
 (;B[nc]
 ;W[of]
 ;B[oe]
 ;W[ne]
 ;B[nd]
 ;W[pf]
 ;B[od]
 ;W[me])))
 (;W[ob]
 ;B[re]LB[nc:B][rc:A]C[White continues with 'a', 'b' is a mistake.]
 (;W[rc]
 ;B[nd])
 (;W[nc]
 ;B[qb])))
 (;W[pe]
 ;B[rd]
 ;W[od]
 ;B[qd]
 ;W[nc]
 ;B[nd]
 ;W[ob]
 ;B[oe]
 ;W[md]
 ;B[oc]
 ;W[nb]
 ;B[pf]
 ;W[ld]))
 (;B[rc]C[Black 7 follows the proverb, "extend from a crosscut", but this time the move is a mistake.]
 ;W[nc]LB[oc:b][pe:a]C[White 8 is a tesuji.
 Black continues with 'a'. Black 'b' is tempting, but less favorable.]
 (;B[pe]
 ;W[ob]
 ;B[qe]
 ;W[md])
 (;B[oc]LB[nd:a][od:b]C[White plays 'a' if the ladder to the lower left is favorable, 'b' if not.]
 (;W[nd]C[White must have the ladder to play this way.]
 ;B[nb]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[ob]
 ;W[lc])
 (;W[od]
 ;B[pb]
 ;W[pe]
 ;B[pc]LB[nd:a][oe:b]C[White plays 'a' if the cut at 'b' can be taken care of.]
 ;W[nd])))
 (;B[qb]C[Black 7 is not recommended.]
 ;W[od]
 ;B[pe]
 ;W[qe]LB[oc:A][oe:B]
 (;B[oc]
 ;W[pf]
 ;B[oe]
 ;W[qk])
 (;B[oe]
 ;W[pb]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[nc]
 ;B[nd]
 ;W[rb]LB[oc:a][rc:b]C[ White 18 is tesuji. The two Black stones are captured.]
 (;B[oc]
 ;W[rc])
 (;B[rc]
 ;W[qa]))))
 (;W[kc]LB[qd:A][me:B]C[White 4 is typically used in handicap games.
 'a' or 'b'.]
 (;B[qd]LB[nc:f][oc:d][rc:e][nf:c][of:b][qi:a]C[Black attempts to take the corner.
 White continues with 'a', 'b', 'c', 'd', 'e' or 'f'.]
 (;W[qi]LB[me:b][dp:a]C[Black may be pressured by playing elsewhere ('a'), or play 'b'.]
 (;B[]LB[mb:d][nc:b][oc:a][rc:c]C[Black plays elsewhere.
 White continues locally with 'a' or 'b'. White 'a' is the most frightening.
 White 'c' and 'd' are not recommended.]
 (;W[oc]
 ;B[od]LB[ob:b][nc:a]C[White continues with 'a'. White 'b' is also possible, but gives Black incredible thickness.]
 (;W[nc]LB[md:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[mb]
 ;B[md]
 ;W[ob]
 ;B[pb])
 (;B[md]LB[qb:c][rc:b][nd:a]C[White continues with 'a' to 'c'.]
 (;W[nd]
 ;B[ne]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]LB[qb:a][me:b]C[White continues with 'a' or 'b'. White 'b' may lead to a sacrifice of the five White stones.]
 (;W[qb]
 ;B[me]
 ;W[rc]
 ;B[rd]
 ;W[of]
 ;B[oe]
 ;W[]C[White plays elsewhere.]
 ;B[sc]LB[pb:a][sb:b]C[Black goes for a ko. White continues with 'a'. White 'b' gives Black the ko.]
 (;W[pb]
 ;B[rb]
 ;W[oa]
 ;B[qa]
 ;W[ma]LB[qc:a]C[White is reduced to two points.])
 (;W[sb]C[White faces a ko.]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[rb]
 ;B[oa]
 ;W[ob]
 ;B[qa]C[Since Black can win by connecting at 'a' (White suffers a lack of liberties), the ko is direct.]))
 (;W[me]LB[kd:a][le:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[kd]LB[qb:a][le:b]C[Black continues with 'a', or more boldly with 'b'.]
 (;W[qb]
 ;B[nf]
 ;W[rc]
 ;B[rd]
 ;W[pf]
 ;B[of]
 ;W[le]
 ;B[jc]
 ;W[lg]
 ;B[nh]LB[qb:20][sc:a][me:18]C[Black 'a' is a serious threat to make ko, but White can avoid it and live. To see how, look into the variation, where White immediately plays 20 without cutting on 18 before.])
 (;W[le]
 ;B[jc]
 ;W[oe]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[og]
 ;B[rc]LB[oa:a][nh:b]C[White continues with 'a'. White 'b' sacrifices the two middle White stones.]
 (;W[oa]
 ;B[nh])
 (;W[nh]C[White 34 is not recommended.]
 ;B[mg]
 ;W[oa]
 ;B[kg])))
 (;B[le]C[Black 19 is a mistake.]
 ;W[mf]LB[pb:c][pc:b][of:a]C[Black continues with 'a', or 'b' or (even worse) 'c' to capture the five White stones. Neither are recommended.]
 (;B[of]
 ;W[qb]
 ;B[lf]
 ;W[mg]
 ;B[oh]
 ;W[rc]
 ;B[rd]
 ;W[lg]C[White 28 is an excellent move. Black has an unfavorable position.])
 (;B[pc]C[Black captures the five White stones.]
 ;W[kb]
 ;B[ma]
 ;W[nf]
 ;B[oe]
 ;W[kd]
 ;B[ld]
 ;W[kf]C[White's thickness is superior.])
 (;B[pb]
 ;W[kb]
 ;B[ma]
 ;W[nf]
 ;B[oe]
 ;W[kd]
 ;B[ld]
 ;W[kf]LB[ob:a][pc:b]C[Black must play 'a' or 'b'.]))))
 (;W[rc]LB[mb:b][rd:a]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[nd]
 ;B[ne]
 ;W[rb]C[White 20 is a nice move.]
 ;B[me]
 ;W[of]
 ;B[oe]C[This ends the joseki.]
 ;W[cq]LB[la:b][pb:d][sc:c][sd:a]C[White plays elsewhere.
 Black 'a' through 'c' are sente, but White cannot be killed by playing, for example, 'd'.]
 (;B[sd])
 (;B[la])
 (;B[sc]
 ;W[pb])
 (;B[pb]C[Black attempts to kill White.]
 ;W[pc]
 ;B[sc]
 ;W[qb]))
 (;B[mb]LB[qb:b][rd:a]C[White continues with 'a'. White 'b', trying to live in the corner, is a mistake.]
 (;W[rd]
 ;B[qb])
 (;W[qb]C[White 14 is a mistake.]
 ;B[rd]LB[oa:a][nd:b]C[White must play 'a'. White dies if 'b'.]
 (;W[oa]
 ;B[nd]C[Black 17 is sente.]
 ;W[pc]C[Black has perfect thickness; very bad for White.])
 (;W[nd]C[White 16 is suicidal.]
 ;B[ne]
 ;W[oa]
 ;B[pc]
 ;W[pb]
 ;B[na]
 ;W[ob]
 ;B[ra]
 ;W[qa]
 ;B[sc]
 ;W[sb]
 ;B[rb]
 ;W[sa]
 ;B[rb]))))
 (;W[qb]
 ;B[mb]
 ;W[rc]
 ;B[pb]
 ;W[rd]
 ;B[qc]
 ;W[rb]
 ;B[nd])))
 (;W[ob]
 ;B[nc]
 ;W[rc]
 ;B[rd]
 ;W[qb]
 ;B[oa]C[Black 15 is an ancient and famous tesuji.]
 ;W[pa]
 ;B[pc]
 ;W[pb]
 ;B[ra]
 ;W[nb]
 ;B[mb]
 ;W[na]
 ;B[rb]C[Black 23 is a sacrifice to squeeze White.]
 ;W[qc]
 ;B[sc]
 ;W[sb]
 ;B[sd]
 ;W[qa]
 ;B[ma]
 ;W[sa]
 ;B[me]))
 (;W[nc]
 ;B[oc]
 ;W[nb]
 ;B[nd]
 ;W[mb]
 ;B[md])
 (;W[rc]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[nd]C[Black blocks. letting White connect underneath.]
 ;W[mb]
 ;B[md]
 ;W[ob]
 ;B[qb]C[Black has a favorable result.])
 (;W[mb]LB[lb:c][nb:b][nc:a]C[White 8 is an endgame move. Black replies with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[nc]
 ;W[nb]
 ;B[ob]
 ;W[lc])
 (;B[nb]C[Black 9 is a mistake.]
 ;W[oc]
 ;B[od]
 ;W[nc])
 (;B[lb]C[Black 9 is a mistake.]
 ;W[lc]
 ;B[nb]
 ;W[md]
 ;B[nc]
 ;W[kb])))
 (;B[me]
 ;W[oc]C[White 8 does not work.]
 ;B[nc]
 ;W[ob]
 ;B[pc]))
 (;W[of]LB[me:B][ne:A]C['a' secures the corner, 'b' is joseki, but leaves room for invasion.]
 (;B[ne]C[Black secures the corner.]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[pc])
 (;B[me]LB[oc:A][ke:B]C['a' is joseki, but Black gets a big wall. 'b' is also possible.]
 (;W[oc]
 ;B[od]LB[ob:A][nc:B]C['a' is correct, 'b' is also possible.]
 (;W[ob]
 ;B[nc]
 ;W[rc]LB[qb:B][rd:A]C['a' making huge influence, is correct.
 'b' is inferior.]
 (;B[rd]
 ;W[qb]C[
 * Joseki *]
 ;B[oa]LB[pa:B][nb:A]C[Black can't kill.
 White lives on 'a' or 'b', being fully enclosed.]
 (;W[nb]
 ;B[mb]
 ;W[pa]
 ;B[pc]
 ;W[pb]
 ;B[ra]
 ;W[na]
 ;B[rb]
 ;W[qc]
 ;B[sc]
 ;W[sb]
 ;B[sd]
 ;W[qa]
 ;B[ma]
 ;W[sa])
 (;W[pa]
 ;B[pc]
 ;W[pb]
 ;B[ra]
 ;W[nb]
 ;B[mb]
 ;W[na]
 ;B[rb]
 ;W[qc]
 ;B[sc]
 ;W[sb]
 ;B[sd]
 ;W[qa]
 ;B[ma]
 ;W[sa]))
 (;B[qb]
 ;W[rd]))
 (;W[nc]LB[mb:A][md:B][nd:C]C['a', 'b' and 'c' leave Black with only a small territory.]
 (;B[mb]
 ;W[nd]
 ;B[ne]LB[qb:A][md:B]
 (;W[qb]
 ;B[md]
 ;W[rc]
 ;B[pb]
 ;W[rd])
 (;W[md]
 ;B[ld]
 ;W[lc]
 ;B[pc]))
 (;B[md]
 ;W[rc]LB[qb:A][rd:B]C['a' or 'b' favor White.]
 (;B[qb]
 ;W[rd])
 (;B[rd]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[rb]
 ;B[oe]
 ;W[ke]))
 (;B[nd]
 ;W[mb]
 ;B[pb])))
 (;W[ke]
 ;B[mg]
 ;W[nf]LB[le:B][mf:A]C['a' or 'b'.]
 (;B[mf]
 ;W[nc]
 ;B[nd]
 ;W[oc]
 ;B[od]
 ;W[mb])
 (;B[le]
 ;W[kf]
 ;B[lg]
 ;W[nc]
 ;B[nb]LB[oc:A][od:B]C['a' is a sacrifice for a reduction on the other side. 'b' is bad shape.]
 (;W[oc]
 ;B[ne]
 ;W[rc]
 ;B[qb]
 ;W[rd]
 ;B[rb])
 (;W[od]
 ;B[ob])))))
 (;W[nf]LB[nd:a][me:b][oe:c]C[Black continues with 'a'. Black 'b' is complicated. 'c' is possible.]
 (;B[nd]C[Black 7 is correct.
 * Joseki *])
 (;B[me]
 ;W[nc]LB[nb:B][md:A][nd:D][oe:C][pf:E]C[White 8 is a trick play.
 Black continues with 'a' or 'b'.
 'c' is inferior.
 Black 'd' makes matters worse. 'e' is not recommended.]
 (;B[md]
 ;W[mb]
 ;B[lb]
 ;W[ob]
 ;B[ma]
 ;W[nb]
 ;B[lc]LB[qb:A][od:B]C['a' or 'b' give Black a big wall.]
 (;W[qb]
 ;B[oe]
 ;W[rc]
 ;B[rd]
 ;W[oc]
 ;B[pg])
 (;W[od]
 ;B[oe]
 ;W[pe]
 ;B[nd]
 ;W[oc]
 ;B[of]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[pb]
 ;B[na]
 ;W[qe]
 ;B[oa]
 ;W[rd]
 ;B[sb]
 ;W[sd]
 ;B[ph]))
 (;B[nb]LB[ob:B][oc:A]C['a' strenghens the Black corner, 'b' takes the corner while Black develops outside.]
 (;W[oc]
 ;B[ob]
 ;W[pc]
 ;B[pb]
 ;W[ne]
 ;B[qc])
 (;W[ob]
 ;B[nd]
 ;W[oc]
 ;B[od]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[lc]
 ;W[qb]
 ;B[kd]))
 (;B[oe]LB[mb:A][of:B]C['a' is correct. 'b' doesn't work.]
 (;W[mb]
 ;B[pg]
 ;W[qh]
 ;B[oi])
 (;W[of]
 ;B[mb]))
 (;B[nd]
 ;W[oc]LB[mb:C][od:A][pf:B]C[
 'a' makes a useless wall, 'b' takes the right side.
 'c' doesn't work.]
 (;B[od]
 ;W[mb])
 (;B[pf]
 ;W[mb]
 ;B[pg])
 (;B[mb]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[md]
 ;W[pe]))
 (;B[pf]))
 (;B[oe]
 ;W[of]))
 (;W[oc]
 ;B[od]
 ;W[nc]LB[md:B][nd:A]TR[of]C['a' and 'b' are joseki.
 Securing life with 'a' is necessary, if there is an additional White stone on the triangled position.]
 (;B[nd]
 ;W[mb]
 ;B[md]
 ;W[ob]
 ;B[pb]C[
 * Joseki *]
 ;W[pc]C[Later continuation.]
 ;B[qb])
 (;B[md]LB[qb:C][rc:B][nd:A]C['a', 'b' or 'c'.]
 (;W[nd]
 ;B[ne]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]LB[qb:A][me:B]C['a' is joseki, 'b' is a trick play.]
 (;W[qb]
 ;B[me]
 ;W[rc]
 ;B[rd]
 ;W[of]
 ;B[oe]C[
 * Joseki *]
 ;B[sc]LB[pb:A][sb:B]C[Later continuation.
 'a' leads to a small life, 'b' to a big ko.]
 (;W[pb]
 ;B[rb]
 ;W[oa]
 ;B[qa]
 ;W[ma])
 (;W[sb]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[rb]
 ;B[oa]
 ;W[ob]
 ;B[qa]))
 (;W[me]LB[kd:A][le:B]C['a' is the correct punishment.
 'b' is getting tricked, Black is walled in.]
 (;B[kd]LB[qb:A][oe:C][nf:B]C['a', 'b' or 'c' gibe a disadvantageous result.]
 (;W[qb]LB[nf:A][of:B]C['a' or 'b'.]
 (;B[nf]LB[rc:A][pf:B]C['a' or first 'b'.]
 (;W[rc]
 ;B[rd]LB[sc:A]C[Later Black 'a'.])
 (;W[pf]
 ;B[of]
 ;W[rc]
 ;B[rd]LB[sc:A]C[Later Black 'a'.]))
 (;B[of]
 ;W[rc]
 ;B[rd]
 ;B[sc]LB[pb:A][rb:C][sb:B]C[Later, White is pressed small.
 'a' is necessary. 'b' leads to ko. If 'c', White dies.]
 (;W[pb]
 ;B[rb]
 ;W[oa])
 (;W[sb]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[rb]
 ;B[oa]
 ;W[ob]
 ;B[qa])
 (;W[rb]
 ;B[sb]
 ;W[oa]
 ;B[pb]
 ;W[pc]
 ;B[ma]
 ;W[pa]
 ;B[ra])))
 (;W[nf]
 ;B[oe]
 ;W[le]
 ;B[jc]
 ;W[qb]
 ;B[pg]
 ;W[rc]
 ;B[rd])
 (;W[oe]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[qb]
 ;B[rb]
 ;W[pb]LB[rf:A][og:B]C['a' makes a small living group and aims to attack White on the right.
 'b' is walling in a big White corner,]
 (;B[rf]
 ;W[rg]
 ;B[rc]
 ;W[oa]
 ;B[re]
 ;W[og]
 ;B[nh])
 (;B[og]
 ;W[qe]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[rd]
 ;B[qh])))
 (;B[le]
 ;W[mf]LB[pb:B][pc:A]C['a' is less bad than 'b'.]
 (;B[pc]LB[kb:A][nf:B]C['a' or 'b' give the same result.]
 (;W[kb]
 ;B[la]
 ;W[nf]
 ;B[oe]
 ;W[kd]
 ;B[ld]
 ;W[kf]LB[la:21]TR[ma]C[Black 21 can also be on the triangled position.])
 (;W[nf]
 ;B[oe]
 ;W[kb]
 ;B[ma]
 ;W[kd]
 ;B[ld]
 ;W[kf]
 ;B[pg]
 ;W[lf]
 ;B[ob]
 ;W[ke]
 ;B[na]))
 (;B[pb]
 ;W[kb]LB[ka:A][la:B]C['a' is less bad than 'b'.]
 (;B[ka]
 ;W[kd]
 ;B[ld]
 ;W[kf]
 ;B[jb]
 ;W[lf]LB[ic:A][of:B]C['a' is necessary. 'b' doesn't work.]
 (;B[ic]
 ;W[ke]
 ;B[la]
 ;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[of]
 ;W[og]
 ;B[pf]
 ;W[pg]
 ;B[pe])
 (;B[of]
 ;W[ke]
 ;B[la]
 ;W[ic]
 ;B[pc]
 ;W[ia]LB[ja:B][ob:A]C['a' or 'b' don't help.]
 (;B[ob]
 ;W[ja])
 (;B[ja]
 ;W[ib]
 ;B[ob]
 ;W[jc])))
 (;B[la]
 ;W[kd]
 ;B[ld]LB[kf:A][pj:B]C['a' is correct, if there is no additional Black stone on 'b'.]
 (;W[kf]
 ;B[pc]
 ;W[oe]
 ;B[nf]
 ;W[ng]
 ;B[of]
 ;W[og]
 ;B[pf]
 ;W[pg]
 ;B[pe]
 ;W[lf]
 ;B[ob]
 ;W[ke]
 ;B[na]
 ;W[ka]
 ;B[ma])
 (;AB[pj]LB[kf:B][kg:A]C['a' is correct. 'b' is a mistake.]
 (;W[kg])
 (;W[kf]
 ;B[lf]
 ;W[nf]
 ;B[oe]
 ;W[lg]
 ;B[kg]
 ;W[ke]
 ;B[mg]
 ;W[lh]
 ;B[ng]
 ;W[of]
 ;B[pf]
 ;W[og]
 ;B[oh]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]
 ;B[oi]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[qk]
 ;W[rj]
 ;B[rk]
 ;W[pe]
 ;B[sj]
 ;W[pf]
 ;B[rf])))))))
 (;W[rc]LB[mb:A][rd:B]C['a' or 'b'.]
 (;B[mb]LB[qb:B][rd:A]C['a' or 'b'.]
 (;W[rd]
 ;B[pb]C[
 * Joseki *])
 (;W[qb]
 ;B[rd]
 ;W[oa]
 ;B[nd]
 ;W[pc]C[
 * Joseki *]))
 (;B[rd]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[nd]
 ;B[ne]
 ;W[rb]
 ;B[me]
 ;W[of]
 ;B[oe]LB[pb:A]C[Black cannot kill on 'a'.]
 ;B[pb]
 ;W[pc]
 ;B[sc]
 ;W[qb]))
 (;W[qb]
 ;B[mb]
 ;W[rc]LB[pb:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[oa]
 ;B[nd]
 ;W[pc])
 (;B[pb]
 ;W[rd]
 ;B[qc]
 ;W[rb]
 ;B[nd]))))
 (;W[rc]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[nd]
 ;W[mb]
 ;B[md]
 ;W[ob]
 ;B[qb])
 (;W[nc]LB[oc:A][nd:B]C['a' or 'b'.]
 (;B[oc]
 ;W[nb]
 ;B[nd]
 ;W[mb]
 ;B[md]C[
 * Joseki *]
 ;W[ob]
 ;B[pb]
 ;W[oe]
 ;B[od]
 ;W[qb]
 ;B[pa]
 ;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sc])
 (;B[nd]LB[mb:A][oc:B]C['a' is correct. 'b' is a mistake.]
 (;W[mb]
 ;B[nb]
 ;W[oc]
 ;B[ob]
 ;W[pc]
 ;B[md]
 ;W[qc]
 ;B[od]
 ;W[rd]
 ;B[lb]
 ;W[rb])
 (;W[oc]
 ;B[mb]LB[qb:B][od:A]C[Neither 'a' nor 'b' help.]
 (;W[od]
 ;B[oe]
 ;W[pe]
 ;B[ne]
 ;W[pc]
 ;B[qc]
 ;W[qb]
 ;B[nb]
 ;W[pb]
 ;B[rb])
 (;W[qb]
 ;B[od]
 ;W[rc]
 ;B[rd]
 ;W[ob]
 ;B[kd]
 ;W[jd]
 ;B[ke]LB[oa:A]C[Later, Black kills on 'a'.]
 ;B[oa]
 ;W[pa]
 ;B[pc]
 ;W[pb]
 ;B[ra])))))
 (;B[me]LB[qc:B][qd:A]C['a' is correct, 'b' gives Black too much strength.]
 ;W[qd]
 ;B[qc]
 ;W[pc]LB[pb:A][od:B]C['a' is correct, 'b' leads to overconcentration.]
 (;B[pb]
 ;W[oc]
 ;B[od]LB[qb:A][rc:B]C['a' is correctm because sente, 'b' is inferior, because gote.]
 (;W[qb]
 ;B[rc]
 ;W[ob]
 ;B[qe]
 ;W[mb]
 ;B[pf])
 (;W[rc]
 ;B[qb]
 ;W[re]))
 (;B[od]
 ;W[rc]
 ;B[qb]
 ;W[re]
 ;B[rb]
 ;W[sb]
 ;B[oc])))
 (;W[lc]LB[lb:c][ld:a][md:b]C[White 4 is not an orthodox move - usually it is an attempt to
 confuse Black in a handicap game.
 The nose contact play dates back to at least 1682, when it was used successfully by the 4th Honinbo Dosaku (1645-1702) (a Go "saint") against the top Okinawan player of the day, Peichin Hamahika.
 Black continues with 'a'. Black 'b' and 'c' are submissive.]
 (;B[ld]LB[mb:a][kc:b][md:c]C[White continues with 'a' or 'b'. The crosscut of White 'c' is not recommended.]
 (;W[mb]
 ;B[md]LB[lb:a][nb:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[lb]C[
 * Joseki *]
 ;B[oc]
 ;W[ic]
 ;B[qe])
 (;W[nb]C[White 8 should be a mistake.]
 ;B[kc]
 ;W[pc]
 ;B[qc]
 ;W[qd]
 ;B[oc]
 ;W[pb]
 ;B[od]LB[ob:a][qe:b]C['a' and 'b' are miai for Black.]))
 (;W[kc]LB[mb:a][md:b]C[Black continues at 'a' or 'b'.]
 (;B[mb]
 ;W[kd]
 ;B[le]LB[qd:b][ke:a]C[White continues with 'a' or 'b'.]
 (;W[ke]
 ;B[qe]
 ;W[pf]
 ;B[ne]C[Black has secured a large corner.]
 ;W[qc]C[White's invasion should fail.]
 ;B[re]
 ;W[pc]LB[ob:b][rb:a]C[White may try 'a' or 'b'.]
 ;B[od]LB[ob:b][rb:a]C[White may fruitlessly try 'a' or 'b'.]
 (;W[rb]
 ;B[ob]
 ;W[pb]
 ;B[sc])
 (;W[ob]
 ;B[sb]))
 (;W[qd]
 ;B[qc]
 ;W[pc]
 ;B[pb]
 ;W[oc]
 ;B[od]LB[qb:b][rc:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[qe]
 ;W[rd]
 ;B[ob]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[hd]C[Black attacks the three White stones with the pincer of Black
 .])
 (;W[qb]
 ;B[rc]
 ;W[ob]
 ;B[qe]
 ;W[nd]LB[nc:a][oe:b]C[Black must cut at 'a', even though it means being squeezed. Black 'b', to avoid the squeeze, lets White out to the center.]
 (;B[nc]
 ;W[pe]
 ;B[rd]
 ;W[oe]
 ;B[qd]
 ;W[ne]
 ;B[md]LB[rb:a][rf:b]C['a' and 'b' are miai for Black.])
 (;B[oe]C[Black 21 is a mistake.]
 ;W[nc]
 ;B[md]
 ;W[ne]C[White is out.]))))
 (;B[md]
 ;W[ob]LB[mb:b][oc:a]C[White's trick play. After it there are many continuarions where Black can either choose the right move or gets tricked.
 Black can play 'a' or 'b'.]
 (;B[oc]
 ;W[qc]
 ;B[qd]
 ;W[pc]LB[nc:b][od:a]C[Black 'a' establishes a position.
 Black 'b' is getting tricked.]
 (;B[od]
 ;W[rd]
 ;B[nb]
 ;W[re]LB[pb:A][id:B]C[Black can live on 'a' and aim for thickness on 'b'.])
 (;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[pf]LB[oe:a][rf:b]C[White a and b are possible continuations.]))
 (;B[mb]LB[pc:b][od:a][qd:c]C[White continues with 'a' to 'c'.]
 (;W[od]LB[pc:b][oe:a]C[Black continues with 'a' or 'b'. Black 'a' may be a complicated, but ultimately leads to a loss for White.
 Black 'b' starts an adavantageous fight.]
 (;B[oe]
 ;W[pe]
 ;B[oc]
 ;W[pc]LB[nd:b][qd:a]C[Black continues with 'a'. Black 'b' is getting tricked.]
 (;B[qd]LB[nc:a][qc:b]C[White 'a' leads to a ko. White 'b' makes a small life in the corner, but Black gets huge influence.]
 (;W[nc]
 ;B[nd]LB[oc:B][qc:A]C['a' starts a ko, 'b' loses everything.]
 (;W[qc]
 ;B[qe]
 ;W[pf]
 ;B[oc])
 (;W[oc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[rc]LB[qe:B][re:A]C[Neither 'a' nor 'b' help.]
 (;W[re]
 ;B[pa]
 ;W[oa]
 ;B[na]
 ;W[pb]
 ;B[nb]
 ;W[qa]
 ;B[sb])
 (;W[qe]
 ;B[re]
 ;W[rf]
 ;B[pa]
 ;W[oa]
 ;B[na]
 ;W[qa]
 ;B[nb]
 ;W[pb]
 ;B[sb]
 ;W[se]
 ;B[sa])))
 (;W[qc]
 ;B[qe]
 ;W[pf]
 ;B[nd]
 ;W[rc]))
 (;B[nd]
 ;W[qd]
 ;B[od]
 ;W[pb]))
 (;B[pc]
 ;W[oc]
 ;B[pe]
 ;W[ne]
 ;B[oe]
 ;W[nd]
 ;B[pg]
 ;W[kd]
 ;B[lf]
 ;W[ng]
 ;B[qg]))
 (;W[pc]LB[od:b][qd:a][qe:c]C[Black 'a' is correct.
 Black 'b' is weak, allowing White to connect his stones.
 Black 'c' gives Black part of the corner (but overconcentrated)
 or a start on the right side (at the expense of giving White
 the corner).]
 (;B[qd]
 ;W[od]LB[oe:a][pf:b]C[The hane of Black 'a' is correct. Black 'b is getting tricked.]
 (;B[oe]LB[qc:a][pe:b]C[White may try 'a' or 'b'. The cut of White 'b' leads to a ko fight favorable to Black.]
 (;W[qc]
 ;B[qe]
 ;W[pf]
 ;B[nd]
 ;W[oc]
 ;B[pe]
 ;W[rf]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[ng])
 (;W[pe]LB[oc:B][nd:A]C['a' or 'b' are ok.]
 (;B[nd]
 ;W[oc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[rc]
 ;W[re]
 ;B[pa]
 ;W[qa]
 ;B[nb]
 ;W[oa]
 ;B[na]
 ;W[qe]
 ;B[nc]
 ;W[pb]
 ;B[sa]
 ;W[sb]
 ;B[sc]
 ;W[of]
 ;B[ne])
 (;B[oc]
 ;W[nc]
 ;B[nd])))
 (;B[pf]
 ;W[pe]
 ;B[qe]
 ;W[oe]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[of]
 ;B[pg]
 ;W[rc]
 ;B[re]
 ;W[id]))
 (;B[od]C[Black 11 is weak.]
 ;W[rd]
 ;B[qd]
 ;W[rc]
 ;B[id])
 (;B[qe]C[Black 11 is not recommended.]
 ;W[pe]
 ;B[od]
 ;W[qd]LB[qc:a][re:b]C[Black takes part of the corner with 'a'.
 Black 'a' gives Black part of the corner, but his stones are overconcentrated.
 Black 'b' gives Black a start on the right side at the expense of giving White the corner.]
 (;B[qc]
 ;W[re]
 ;B[rd]
 ;W[qe]
 ;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[sd]
 ;B[oc])
 (;B[re]
 ;W[rd]
 ;B[rf]
 ;W[qg]
 ;B[pf]
 ;W[oe]
 ;B[pg]
 ;W[nd]
 ;B[qh])))
 (;W[qd]LB[pc:b][qc:a]C[Black 'a' resists. Black 'b' submits.]
 (;B[qc]
 ;W[pc]
 ;B[od]
 ;W[qb]
 ;B[qe]
 ;W[rc]LB[rd:a][re:b]C[Black 'a' starts a ko. Black 'b' leaves a cutting point.]
 (;B[rd]LB[qc:B][re:A]C['a' -> deceisive ko, 'b' gives Black superior thickness.]
 (;W[re]
 ;B[qc])
 (;W[qc]
 ;B[pe]
 ;W[re]
 ;B[rf]
 ;W[sd]
 ;B[qg]))
 (;B[re]CR[pe]C[White can aim at the red dot cutting point.]
 ;W[pe]
 ;B[pf]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[mg]
 ;B[rf]))
 (;B[pc]
 ;W[qc]
 ;B[pb])))))
 (;W[md]
 ;B[nc]C[Black follows the proverb: extend from a cross cut.]
 ;W[kc]
 ;B[kd]
 ;W[jd]
 ;B[me]
 ;W[ic]
 ;B[qe]LB[pf:a][pi:b]C[If White 'a', Black attacks with 'b'.]
 ;W[pf]C[White 14 is heavy.]
 ;B[pi]))
 (;B[md]C[White 4 now looks like a forcing move. Black 5 therefore is submissive.]
 ;W[ob]LB[mb:b][oc:a]C[If Black has the ladder to catch White 4, Black should play 'a'.
 Black 'b', keeping White from connecting, is tempting, and troublesome.]
 (;B[oc]C[Black plays 7 when the ladder is favorable.]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[od]
 ;W[rd]LB[nb:b][re:a]C[Black continues with 'a' if the ladder is favorable. If not, Black must play 'b'.]
 (;B[re]C[Black must have the ladder to play this way.]
 ;W[rc]
 ;B[qe]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[kc])
 (;B[nb]C[Black 13 is bad, but necessary if Black does not have the ladder to catch White 4.]
 ;W[re]
 ;B[jc]))
 (;B[mb]LB[pc:a][od:b]C[Black 7 is not recommended.
 White continues with 'a'. White 'b' is tempting, and dangerous.]
 (;W[pc]LB[od:a][qd:b][qe:c]C[Black can let White cross under with 'a', or struggle with 'b'.]
 (;B[od]
 ;W[rd]LB[qc:a][qd:b]C[Black continues with 'a' or 'b'. White can still connect his stones.]
 (;B[qc]
 ;W[qb])
 (;B[qd]
 ;W[rc]))
 (;B[qd]
 ;W[od]
 ;B[pf]
 ;W[pe]
 ;B[qe]
 ;W[oe]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[of]
 ;B[pg]
 ;W[rc]
 ;B[re]
 ;W[jc]C[White has the corner, and the three Black stones under attack.])
 (;B[qe]LB[pe:a][pf:b]C[White continues with the tricky tesuji of 'a'. White 'b' looks
 standard, but is a mistake.]
 (;W[pe]
 ;B[qd]
 ;W[od])
 (;W[pf]C[White 10 is a mistake.]
 ;B[od]C[The two White stones have aji.]
 ;W[rd]
 ;B[re]
 ;W[rc]LB[qb:a][rb:b]C[Black may try 'a' or 'b'.]
 (;B[qb]
 ;W[rb]C[Black has nowhere to go.])
 (;B[rb]
 ;W[qb]))))
 (;W[od]C[White 8 is not recommended. White faces trouble]
 ;B[oe]
 ;W[pe]
 ;B[oc]
 ;W[pc]LB[nd:b][qd:a]C[Black continues with 'a'. Black 'b' is obvious, and a mistake.]
 (;B[qd]
 ;W[nc]
 ;B[nd]LB[oc:b][qc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qc])
 (;W[oc]C[White 16 is a mistake, though not obviously so.]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[rc]
 ;W[qe]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[sb]
 ;B[pa]C[Black 27 seals White's fate.]))
 (;B[nd]C[Black 13 is a mistake.]
 ;W[qd]LB[od:a]C[Black could connect ('a') or play a ko.]
 ;B[od]
 ;W[pb]C[White steals the corner.]))))
 (;B[lb]
 ;W[mb]LB[kb:b][nb:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nb]
 ;W[md]
 ;B[nc]
 ;W[kb]
 ;B[ma]LB[kd:a]C[White plays 'a' to consolidate, or plays elsewhere, taking the
 moves as forcing moves. Regardless, Black has played submissively.]
 ;W[kd])
 (;B[kb]LB[nc:b][pc:a][md:c]C[White plays 'a' to keep the situation fluid (and more difficult for Black). White 'b' and 'c' follow the proverb of 'extend from a cross-cut', but do not work as well.]
 ;W[pc])))
 (;W[ob]LB[pb:B][oc:A]C['a' is joseki, 'b' is slightly disadvantageous in territory.]
 (;B[oc]
 ;W[qc]
 ;B[qd]LB[nb:B][ob:4][pc:A][rd:C][qf:2]C['a' is joseki -> White is enclosed in the corner.
 'b' is inferior. Black takes the corner, and Black 2 is weakened, while White connects to the top very low.
 'c' connects to White 2, but throws away White 4.]
 (;W[pc]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[pf]
 ;B[oe]C[
 * Joseki *])
 (;W[nb]
 ;B[nc]
 ;W[mb]
 ;B[pb]
 ;W[lc]
 ;B[pc])
 (;W[rd]
 ;B[nb]
 ;W[rb]
 ;B[pb]))
 (;B[pb]
 ;W[pc]LB[oc:A][qc:B][qf:2]C['a' is correct and takes a lot of territory on the right. 'b' creates a small group on the top, while White 2 suffers in the shadow of a Black wall.]
 (;B[oc]
 ;W[qc]
 ;B[nb]
 ;W[od]
 ;B[oa]
 ;W[pe]
 ;B[nd]
 ;W[qd])
 (;B[qc]
 ;W[oc]
 ;B[od]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[rd]
 ;W[mb])))
 (;W[rc]LB[qc:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[qd])
 (;B[qc]
 ;W[qd]
 ;B[pc]
 ;W[re]))
 (;W[pc]LB[qc:B][od:A]C['a' is joseki, 'b' is a mistake.]
 (;B[od]LB[qc:B][qd:A]C['a' is joseki, 'b' is not.]
 (;W[qd]
 ;B[qc]LB[oc:B][rc:A]TR[of]C[
 * Joseki *
 'a' is usual.
 'b' i spossible with an additional White stone on the triangled
 position.]
 (;W[rc]
 ;B[qb]
 ;W[re]
 ;B[rb]
 ;W[sb]
 ;B[oc])
 (;AW[of]
 ;W[oc]LB[nc:B][qe:A]C['a' is correct. 'b' is a mistake.]
 (;B[qe]
 ;W[rd]LB[nc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;B[nc]LB[qb:A][pe:B]C['a' takes the corner, 'b' the outside.]
 (;W[qb]
 ;B[re]
 ;W[rc]
 ;B[pe])
 (;W[pe]
 ;B[ob]))
 (;B[re]
 ;W[nd]
 ;B[rc]
 ;W[pe]
 ;B[sd]))
 (;B[nc]
 ;W[qb]
 ;B[rc]
 ;W[pe])))
 (;W[qc]
 ;B[qd]))
 (;B[qc]LB[nc:C][oc:B][od:A]C['a', 'b' and 'c' lead to a low White group on the top.]
 (;W[od]
 ;B[oc]
 ;W[pb]LB[ob:B][qd:A]C[After 'a' White must fight for a small life. 'b' encloses a small White corner with huge influence.]
 (;B[qd]
 ;W[nc]
 ;B[nd]
 ;W[ob]
 ;B[oe]
 ;W[md]
 ;B[oc])
 (;B[ob]
 ;W[qd]
 ;B[pe]
 ;W[qb]
 ;B[qe]
 ;W[rc]
 ;B[re]
 ;W[rd]
 ;B[ne]))
 (;W[oc]
 ;B[od]
 ;W[qb]
 ;B[rd]
 ;W[mb]
 ;B[nd]
 ;W[lc]
 ;B[rb]LB[ob:A][pj:B]C[After 'a' White connects to the top left. After 'b' White is
 enclosed on top, but creates a group on the right.]
 (;W[ob]
 ;B[ld]
 ;W[kc]
 ;B[qi])
 (;W[pj]
 ;B[nb]
 ;W[nc]
 ;B[md]
 ;W[ob]
 ;B[lb]
 ;W[na]
 ;B[kc]LB[ld:A]C[Ladder on 'a'.]))
 (;W[nc]
 ;B[nd]
 ;W[od]
 ;B[oe]
 ;W[oc]
 ;B[qd]
 ;W[mb]
 ;B[md]
 ;W[lb]
 ;B[pf])))
 (;W[rd]LB[qc:A][qh:B]C['a' is ok, 'b' can not be recommended.]
 (;B[qc]
 ;W[qi])
 (;B[qh]
 ;W[qc]
 ;B[qe]
 ;W[re]
 ;B[pf]
 ;W[pg]
 ;B[qg]
 ;W[rf]
 ;B[of]
 ;W[oc]
 ;B[pc]
 ;W[pb]
 ;B[od]))
 (;W[od]
 ;B[oc]
 ;W[qd]LB[qc:A][pe:B]C['a' punishes, 'b' doesn't.]
 (;B[qc]
 ;W[pe]
 ;B[pc])
 (;B[pe]
 ;W[qe]
 ;B[qc]
 ;W[rc]))
 (;W[pj]LB[qc:B][qd:A]C[Black 'a' is gote. If Black takes sente, the White invasion on 'b' remains possible.
+]
 ;B[qd]))
 (;B[pf]LB[pe:b][qe:c][pg:a]C[
 Tobi-Tsuke (jump-attach)
 ----------------------------
 First step of the Tsuke-Nobi-Joseki. The move should be played only if Black has a big moyo on the top side. The aim of this joseki is to make shape quickly. The approach is defensive.
 White continues with 'a'. White 'b' is a trick play. White must have the ladder to play 'b'. 'c' is bad.
+]
 (;W[pg]LB[qe:A][of:B][og:C]C[Black continues with 'a' or 'b'. Black 'c' is an old joseki.
+]
 (;B[qe]C[Lee Changho's favorite]
 ;W[of]
 ;B[pe]LB[rf:A][mg:E][og:B][qg:C][rg:D]C[White continues with 'a' to 'c'. White 'd' is less preferable to 'a'.
 If the right side is unimportant because of a low Black position in the lower right, 'e' is the best move.
+]
 (;W[rf]LB[re:b][og:a][pi:c]C[White 8 is very territory oriented, a play to make when the center is unimportant.
 Black continues with 'a', 'b' or 'c'.
+]
 (;B[og]
 ;W[ph]LB[nf:a][oh:b]C[Black continues safely with 'a', or 'b'.
+]
 (;B[nf]
 ;W[oh]LB[oe:b][ng:a]C[Black continues with 'a' or 'b'.]
 (;B[ng]LB[qc:b][re:a]C[White continues with 'a' or 'b'.]
 (;W[re]
 ;B[qc])
 (;W[qc]LB[pc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[rd]
 ;B[jc])
 (;B[re]
 ;W[ob]
 ;B[mc])))
 (;B[oe]
 ;W[re]C[One must consider carefully the timing of White 14.]
 ;B[rd]
 ;W[qc]C[White 16 is a tesuji to start a living group in the corner.]
 ;B[qd]
 ;W[rc]
 ;B[sd]
 ;W[ob]
 ;B[mb]C[Black 21 is a severe checking move.]
 ;W[ra]LB[oc:A][nh:B]C[White 22 is the vital point for White to live.
 'a' closes in the corner in gote, 'b' enlargens the wall.]
 (;B[oc]
 ;W[nb]
 ;B[nc]
 ;W[pc]
 ;B[lc])
 (;B[nh]
 ;W[ni]
 ;B[mh])))
 (;B[oh]LB[nf:C][oi:B][pi:A]C[White continues with 'a' or 'b'. Fighting on 'c' strengthens Black.
+]
 (;W[pi]C[White 12 is submissive.]
 ;B[nf]
 ;W[re]
 ;B[qc]
 ;W[ql]C[
 * Joseki *
 ])
 (;W[oi]
 ;B[nf]
 ;W[re]
 ;B[qc]
 ;W[ni])
 (;W[nf]LB[oi:b][pi:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pi]
 ;W[oi]C[The outcome of the fight is unpredictable.]
 ;B[mg]
 ;W[qi]
 ;B[pj]
 ;W[qj]
 ;B[pk])
 (;B[oi]C[Black cannot get a favorable result playing 13 here.]
 ;W[pi]))))
 (;B[re]C[Black 9 cedes no territory to White.]
 ;W[og]
 ;B[md]
 ;W[qi]C[White 12 protects against the cut at the marked spot. The result favors Black]MA[qg])
 (;B[pi]LB[oh:A][oi:B]C['a' builds a base in gote, 'b' a wall in sente.]
 (;W[oh]
 ;B[nd]
 ;W[oi]
 ;B[pk]
 ;W[qi])
 (;W[oi]
 ;B[ph]
 ;W[og]
 ;B[rh]
 ;W[qg]
 ;B[nd]LB[oj:B][ok:A]C['a' or 'b'.]
 (;W[ok]
 ;B[qk]
 ;W[oh])
 (;W[oj]
 ;B[qk]
 ;W[oh]
 ;B[pm]))))
 (;W[og]LB[nd:c][qg:a][rg:b]C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
 (;B[qg]
 ;W[qh]
 ;B[rf]LB[nd:B][rg:A]C['a' is necessary, 'b' is a mistake.]
 (;W[rg]LB[nd:a][qf:b]C[Black continues with 'a'. Black 'b', connecting, is timid.]
 (;B[nd])
 (;B[qf]C[Black 13 is a mistake.]
 ;W[nd]C[White has the good point that Black should have taken.]
 ;B[rh]
 ;W[ri]
 ;B[sg]
 ;W[qi]))
 (;W[nd]
 ;B[rh]))
 (;B[rg]LB[nd:a][rh:b]C[Black 9 is not recommended. White should ignore Black 9 and play
 'a'. White 'b' is a mistake.]
 (;W[nd]
 ;B[qi]C[Black has a low position. White 10 is the prime spot.])
 (;W[rh]C[White 10 is a mistake.]
 ;B[rf]
 ;W[qh]
 ;B[nd]))
 (;B[nd]LB[rf:A][pl:B]C['a' or 'b'.]
 (;W[rf]LB[qc:B][re:A]C['a' is slow, but necessary. If omitted, White invades on 'b'.]
 (;B[re])
 (;W[qc]LB[pc:A][re:B]C['a' or 'b'.]
 (;B[pc]
 ;W[re])
 (;B[re]
 ;W[ob])))
 (;W[pl]
 ;B[qg]
 ;W[qh]
 ;B[rf]
 ;W[rh])))
 (;W[qg]LB[mc:c][nd:a][og:b]C[On the empty board it's usually risky for White to connect this way, because the cut at 'b' is painful.
 Black continues with 'a' or 'b'. Black 'c' is not recommended.
+]
 (;B[nd]
 ;W[qk]
 ;B[jc]C[The joseki concludes.]
 ;W[qc]C[This demonstrates that the corner is safe from invasion.]
 ;B[pb]
 ;W[rd]
 ;B[re]
 ;W[pc]
 ;B[oc]
 ;W[qb]
 ;B[ob]C[White cannot live in the corner.]
 ;W[rb]
 ;B[qa]LB[ra:a][sc:b]C['a' and 'b' are miai.])
 (;B[og]LB[nf:A][oh:B]C[The cut of Black 9 is a severe move.
 'a' or 'b'.]
 (;W[nf]LB[ng:B][oh:A]C['a' or 'b' are ok.]
 (;B[oh]
 ;W[qj]
 ;B[nd])
 (;B[ng]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[pi]
 ;W[ri]
 ;B[rj]
 ;W[qj]
 ;B[qi]
 ;W[rk]
 ;B[rh]
 ;W[sj]
 ;B[qh]))
 (;W[oh]
 ;B[ng]
 ;W[pi]
 ;B[mh]C[Great result for Black]))
 (;B[mc]C[Black 9 leaves aji in the corner.]
 ;W[qk]
 ;B[]C[Black plays elsewhere.]
 ;W[pc]LB[oc:b][qc:a]C[Black may try 'a' or 'b'.]
 (;B[qc]
 ;W[oc]C[White cannot be caught.]
 ;B[qb]
 ;W[nd])
 (;B[oc]
 ;W[qc]LB[ob:c][nd:a][rd:b]C[Black may try 'a' or 'b'. Black 'c' is a mistake.]
 (;B[nd]C[Black defends against the cut.]
 ;W[rd]
 ;B[re]
 ;W[rb])
 (;B[rd]C[Black goes for the kill (but can't get it).]
 ;W[ob]
 ;B[nc]
 ;W[rc]
 ;B[nb]
 ;W[pa])
 (;B[ob]C[Black 14 is a mistake that could easily cost Black the game.]
 ;W[re]
 ;B[rd]
 ;W[qd]
 ;B[rf]
 ;W[se]
 ;B[sf]
 ;W[od]C[Black is captured.]
 ;B[sd]
 ;W[re]
 ;B[se]
 ;W[oe]
 ;B[re]
 ;W[rc]))))
 (;W[rg]LB[re:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[ph]
 ;B[nf])
 (;B[re]C[Black cedes no territory.]
 ;W[og]
 ;B[rf]
 ;W[qg]LB[me:a][pk:b]C[Black continues with 'a' or 'b', another extension at top, or plays elsewhere.]
 (;B[me]C[Black 13 is the obvious extension; having secured territory,
 balancing with a move emphasizing influence.])
 (;B[pk]C[Black 13 is played with support at bottom right, or as an invasion.])))
 (;W[mg]
 ;B[nd]))
 (;B[of]LB[pc:e][qc:d][qd:b][qe:a][re:c]C[
 Tsuke-Nobi
 -------------
 White continues with 'a' to 'd'. White 'd' is a special case
 when Black has support at top. White 'e' is a trick play.]
 (;W[qe]
 ;B[qd]LB[pe:D][og:c][ph:d][qh:b][qj:a]C[White continues with 'a' to 'c'.
 If White is already strong on the right side, he enlarges his territory with 'd'.
 'e' tenuki is wrong.]
 (;W[qj]LB[jc:A][nd:B][ph:C]C[
 This move is not sente to cut.
 'a' is joseki. 'b' is correct, if there is already a stone around 'a'.
 'c' is a leaning attack against a weak White group on the top side.
+]
 (;B[jc]LB[lc:e][mc:d][nc:b][kd:f][rd:c][pe:a]C[The obvious White 'a' is a mistake.
 White invades with 'b'.
 White 'c' is an attempt to complicate the situation to fool a weaker player.
 The invasions of White 'd' and 'e' are not as good as 'b'.]
 (;W[pe]C[White 10 illustrates the outside turn to the cut; a mistake.]
 ;B[oe]
 ;W[od]
 ;B[nd]
 ;W[oc]
 ;B[rd]LB[re:A][qg:B]C[Black 15 is the vital point.
 After 'a', White gets an unfavorable ko, after 'b', he dies in the corner.]
 (;W[re]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[nc]LB[ob:B][pb:A]C['a' is correct. 'b' is a mistake.]
 (;W[pb]
 ;B[nb]
 ;W[rb]
 ;B[qb]LB[qa:B][qc:A]C['a' is correct. 'b' is a mistake.]
 (;W[qc]
 ;B[pc]
 ;W[ob]
 ;B[rc]
 ;W[qa]
 ;B[oa]
 ;W[qc]
 ;B[se]
 ;W[rf]
 ;B[qb])
 (;W[qa]
 ;B[ob]
 ;W[pc]
 ;B[qc]
 ;W[pa]
 ;B[ra]
 ;W[sa]
 ;B[oa]))
 (;W[ob]
 ;B[se]
 ;W[rf]
 ;B[nb]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[qc]))
 (;W[qg]
 ;B[nc]LB[ob:B][pb:A]C[Neither 'a' nor 'b' work.]
 (;W[pb]
 ;B[nb]
 ;W[rb]
 ;B[pc]
 ;W[ob]
 ;B[qb]
 ;W[qa]
 ;B[qc]
 ;W[pa]
 ;B[ra]
 ;W[sa]
 ;B[na])
 (;W[ob]
 ;B[nb]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[qc]
 ;W[pb]
 ;B[sb]
 ;W[re]
 ;B[sd]
 ;W[qa]
 ;B[oa])))
 (;W[nc]C[White 10 is the vital point for invasion.]
 ;B[oc]LB[md:b][nd:a]C[White continues with 'a' or 'b'.
 With White 'a', Black builds influence on the left. With White 'b', Black takes the corner.]
 (;W[nd]C[tachi (stand)]
 ;B[pe]
 ;W[kd]
 ;B[jd]
 ;W[ke]
 ;B[je]
 ;W[kf]
 ;B[ig])
 (;W[md]
 ;B[nd]
 ;W[nb]
 ;B[je]
 ;W[ob]
 ;B[pb]LB[qb:b][ne:c][mf:a]C[White continues with 'a'. White 'b' is a trick play. White 'c' is a mistake.]
 (;W[mf]
 ;B[rd])
 (;W[qb]LB[oa:b][qg:a]C[White 18 is a trick play.
 'a' is correct, 'b' is getting tricked.]
 (;B[qg]LB[pa:c][rg:b][qh:a]C[Black 19 foils the trick play. Black 19 is a sacrifice play.
 White may try 'a' to 'c'.]
 (;W[qh]C[Black 19 becomes a sacrifice.]
 ;B[rg]
 ;W[rh]
 ;B[og]
 ;W[ph]
 ;B[oa]LB[qc:b][rd:a]C[White will have trouble taking care of the invading stones at top.
 White cannot connect by playing 'a' because of Black 19 and 21.]
 (;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc])
 (;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[rc]))
 (;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[oa]
 ;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[rc]C[Black 27 prevents White from crossing under.])
 (;W[pa]
 ;B[qh]))
 (;B[oa]C[White 19 is a mistake. White has been tricked.]
 ;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[mc]
 ;W[ne]
 ;B[od]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[na]
 ;W[le]LB[nb:b][ng:a]C[Black either has to escape with 'a', or make two eyes in gote with 'b'.]))
 (;W[ne]C[White 18 is a mistake.]
 ;B[od]
 ;W[qb]
 ;B[pa]
 ;W[qc]
 ;B[rb]C[Black 23 is a (te)suji.]
 ;W[rc]
 ;B[rd]
 ;W[sd]LB[sb:a][re:c][se:b]C[Black continues with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[sb]
 ;W[sc]
 ;B[re])
 (;B[se]C[Black 27 is a mistake. White gets a ko.]
 ;W[sb]
 ;B[ra]
 ;W[re])
 (;B[re]C[Black 27 is a mistake. White will be able to connect at top.]
 ;W[ra]
 ;B[sb]
 ;W[pc]))))
 (;W[rd]C[White 10 is a feint.]
 ;B[rc]
 ;W[pe]
 ;B[oe]
 ;W[od]LB[oc:B][nd:A]C['a' or 'b'.]
 (;B[nd]
 ;W[oc]LB[pb:a][re:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pb]LB[ob:a][pc:b]C[White continues with 'a'. White 'b' doesn't work.]
 (;W[ob]
 ;B[pc]
 ;W[mc]
 ;B[ld]
 ;W[lc]
 ;B[kd]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[mb])
 (;W[pc]C[White 18 is a mistake.]
 ;B[qc]
 ;W[ob]
 ;B[nb]
 ;W[qb]
 ;B[nc]
 ;W[pa]
 ;B[rb]
 ;W[ra]
 ;B[re]LB[sd:A][rf:B]C['a' or 'b'.]
 (;W[sd]
 ;B[se]
 ;W[rf]
 ;B[sc]LB[sf:B][qh:A]C['a' or 'b'.]
 (;W[qh]
 ;B[na]
 ;W[oa]LB[sa:b][mf:a]C[Black 'a' to protect against the cut, or 'b' to provoke a ko
 to settle the corner.]
 (;B[mf]LB[sa:a]C[The corner becomes a seki (unless Black 'a', forcing the ko).])
 (;B[sa]C[Black forces a ko to resolve the corner with Black 35.]))
 (;W[sf]
 ;B[na]
 ;W[oa]
 ;B[ph]
 ;W[qh]
 ;B[og]
 ;W[qg]
 ;B[pi]))
 (;W[rf]
 ;B[sd]
 ;W[sb]
 ;B[na]
 ;W[oa])))
 (;B[re]C[Black 17 is a mistake.]
 ;W[qc]
 ;B[sd]
 ;W[pc]
 ;B[rd]
 ;W[rf]))
 (;B[oc]
 ;W[nd]
 ;B[nc]
 ;W[md]))
 (;W[mc]C[As an invasion, White 10 misses the mark. White heads for trouble.]
 ;B[oc]
 ;W[le]
 ;B[je]
 ;W[lg]
 ;B[nh])
 (;W[lc]
 ;B[nc]
 ;W[le]
 ;B[je]
 ;W[lg]
 ;B[nh])
 (;W[kd]
 ;B[jd]
 ;W[ke]
 ;B[lb]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[oc]C[Both Black groups are secure, while White is heavy. Black can continue profitably harrassing White.]))
 (;B[nd]
 ;B[ql]LB[ph:B][oj:A][dp:C]C[Later continuation.
 White can secure his group on 'a' or 'b'.
 After tenuki 'c' Black can make a painful reduction.]
 (;W[oj])
 (;W[ph])
 (;W[dp]
 ;B[qh]LB[qg:C][rh:A][qi:B]C['a' and 'b' sacrifice, 'c' is pressed down low.]
 (;W[rh]LB[rg:A][ri:B]C['a' and 'b' give the same situation.]
 (;B[rg]
 ;W[qg]
 ;B[ri]
 ;W[qi]
 ;B[ph]
 ;W[sh]
 ;B[sg]
 ;W[oh]
 ;B[pi]
 ;W[oj]
 ;B[og]
 ;W[oi]
 ;B[si]
 ;W[rh]
 ;B[sh]
 ;W[pj]
 ;B[rh]
 ;W[rj]
 ;B[re]
 ;W[qn]C[White sacrifices some stones.])
 (;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[qg]LB[rg:16][ri:14]C[Same variation as 16 played before 14.]))
 (;W[qi]
 ;B[ph]
 ;W[rh]
 ;B[rg]
 ;W[qg]LB[rg:16][ph:14]C[Same variation as 16 played before 14,])
 (;W[qg]
 ;B[qi]LB[pj:B][rj:A]C['a' is correct. 'b' is a mistake.]
 (;W[rj]
 ;B[oi]
 ;W[rh]
 ;B[ri]
 ;W[si]
 ;B[oh])
 (;W[pj]
 ;B[rj]
 ;W[rk]
 ;B[oh]LB[ph:A][ri:B]C['a' or 'b' are no help.]
 (;W[ph]
 ;B[pi]
 ;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[pk])
 (;W[ri]
 ;B[rh]
 ;W[ph]
 ;B[pi]
 ;W[oi]
 ;B[si])))))
 (;B[ph]
 ;W[og]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[ng]
 ;W[oh]
 ;B[nh]
 ;W[oi]))
 (;W[qh]
 ;B[nd]C[Black must answer with 9.]
 ;W[lc]
 ;B[jc]LB[oc:a][le:b]C[White continues with 'a' or 'b'.]
 (;W[oc]
 ;B[nc]
 ;W[nb]LB[mb:b][od:a]C[Black continues with 'a' or 'b'.]
 (;B[od]
 ;W[pb]
 ;B[mc]
 ;W[mb]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic])
 (;B[mb]C[Black 15 is a tough-minded move.]
 ;W[ob]
 ;B[mc]
 ;W[od]
 ;B[pe]
 ;W[ne]
 ;B[me]
 ;W[nf]
 ;B[og]))
 (;W[le]
 ;B[je]LB[nb:b][oc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc]
 ;B[od]
 ;W[nb]LB[pb:a][nc:b]C[Black continues with 'a' or 'b'.]
 (;B[pb]
 ;W[lg]
 ;B[nh])
 (;B[nc]
 ;W[pb]
 ;B[pc]
 ;W[ob]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[kb]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jb]
 ;B[ic]))
 (;W[nb]C[White 14 is timid.]
 ;B[oc]
 ;W[ob]
 ;B[pb])))
 (;W[og]LB[nd:B][ng:A]C['a' is correct, 'b' is inferior.]
 (;B[ng]LB[nf:b][nh:c][qi:a]C[White continues with 'a'. White 'b' is unreasonable. White 'c'
 helps Black.]
 (;W[qi]
 ;B[nd])
 (;W[nf]LB[nd:A][ne:B][mf:C]C[White 10 starts a disadvantageous fight with the cut. 'a' is correct, 'b' and 'c' are mistakes.]
 (;B[nd]LB[ne:B][mf:A]C['a' or 'b'.]
 (;W[mf]
 ;B[nh]
 ;W[qi]
 ;B[ld]C[The prospects for the two White stones are not good.]
 ;W[lg])
 (;W[ne]
 ;B[od]
 ;W[le]
 ;B[lc]
 ;W[lg]
 ;B[nh]
 ;W[qi]
 ;B[mi]))
 (;B[ne]
 ;W[mf])
 (;B[mf]
 ;W[ne]
 ;B[od]
 ;W[nd]))
 (;W[nh]
 ;B[mg]
 ;W[mh]
 ;B[lg]
 ;W[qh]
 ;B[jc]LB[nc:A]C[Still, White can invade at 'a'.]
 ;W[nc]
 ;B[oc]
 ;W[ob]
 ;B[pb]))
 (;B[nd]
 ;W[qk]LB[mg:A]C[Later, White jumps to 'a'.]))
 (;W[pe]LB[od:B][oe:A]
 (;B[oe]
 ;W[od]
 ;B[rd]
 ;W[qh]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[pb]LB[nb:B][qb:A]
 (;B[qb]
 ;W[nb]
 ;B[mb]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[lb]
 ;W[ld]LB[kb:A][mf:B]
 (;B[kb]
 ;W[me]
 ;B[ne]
 ;W[og]
 ;B[nf]
 ;W[lg])
 (;B[mf]
 ;W[kb]))
 (;B[nb]
 ;W[rb]
 ;B[pc]
 ;W[ob]
 ;B[qb]
 ;W[qa]
 ;B[qc]
 ;W[pa]
 ;B[ra]
 ;W[sa]
 ;B[na]
 ;W[re]
 ;B[oa]
 ;W[ra]
 ;B[rc]
 ;W[sd]
 ;B[sb]))
 (;B[od]
 ;W[oe]
 ;B[nd]
 ;W[ne]))
 (;W[]LB[og:B][pi:A]C['a' is the correct punishment, 'b' is helping White.]
 (;B[pi]
 ;W[og]
 ;B[ng]
 ;W[oh])
 (;B[og]
 ;W[ph])))
 (;W[qd]LB[qc:b][qe:a][qg:c]C[Black continues with 'a' or 'b'.]
 (;B[qe]C[Old fashion]
 ;W[re]
 ;B[pe]
 ;W[rg]LB[qc:a][og:b]C[Joseki continues with 'a'. Black 'b' first is out of order.]
 (;B[qc]LB[rd:A][og:B]
 (;W[rd]
 ;B[og]
 ;W[ph]
 ;B[jc]C[Outdated joseki. White is favorable]
 ;W[pc]LB[rc:a]C[White 16 illustrates why Black 15 should be so wide. White must play 16 before supporting stones ruin the opportunity (where Black pushes White out toward the top where White cannot make life).
 The difference between White 16 and White 'a' is over twenty
 points.]
 ;B[oc]
 ;W[pb]LB[ob:a][qb:b]C[Black continues with 'a', unless there are supporting stones for the tough move of 'b'.]
 (;B[ob]
 ;W[qb]
 ;B[je])
 (;B[qb]C[Black 19 can be played with support such as the black stones
 shown.]
 ;W[ob]
 ;B[nb]
 ;W[nc]
 ;B[pa]
 ;W[od]
 ;B[oa]
 ;W[oc]
 ;B[mb]C[The White stones cannot escape.]))
 (;W[og]C[In the local context, White 12 is not good.]
 ;B[rd]C[White continues with 'a'. White 'b' is not good.]))
 (;B[og]C[Black 11 is not recommended.]
 ;W[qc]
 ;B[ph]
 ;W[qg]
 ;B[pc]
 ;W[oh]))
 (;B[qc]LB[qe:a][re:b]C[Best answer
 White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pc]
 ;W[qi]
 ;B[jc]LB[lc:A]C[White invasion point at 'a'.]
 ;W[lc]
 ;B[ke]
 ;W[me]
 ;B[og]
 ;W[ph]
 ;B[mf]
 ;W[nc]
 ;B[ob])
 (;W[re]
 ;B[rd]
 ;W[qe]
 ;B[rc]LB[pc:c][pe:b][qj:a]C[White continues with 'a'. White 'b' is also possible, though it give Black superior thickness. White 'c' is not recommended.]
 (;W[qj]
 ;B[nd])
 (;W[pe]C[White 12 takes the corner, sacrificing thickness.]
 ;B[oe]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[qb]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[se]
 ;W[rf]
 ;B[qi]C[White will likely have to capture the Black corner stones, thus getting about 15 points. Black's thickness should translate to more.])
 (;W[pc]C[White 'c' is not recommended.]
 ;B[oc]
 ;W[pe]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[nf]
 ;B[og]
 ;W[ph]LB[me:A][mf:B]C['a' or 'b'.]
 (;B[me]
 ;W[ng]
 ;B[jd]C[Black can still play a ladder block.])
 (;B[mf]
 ;W[ng]))))
 (;B[qg]LB[pe:B][qe:A][qh:C]C['a' is correct, 'b' and 'c' are mistakes.]
 (;W[qe]
 ;B[ph]
 ;W[pc]
 ;B[og]
 ;W[nc])
 (;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[ph]LB[pc:A][od:B]C[After 'a' or 'b' Black gets a good result.]
 (;W[pc]
 ;B[od])
 (;W[od]
 ;B[pc]
 ;W[oc]
 ;B[qc]
 ;W[rg]
 ;B[og]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]
 ;W[nb]
 ;B[pb]
 ;W[mc]
 ;B[sb]
 ;W[rh]
 ;B[kc]))
 (;W[qh]
 ;B[qe]
 ;W[rg]
 ;B[qc])))
 (;W[re]LB[qc:b][qd:c][rd:a][qe:d]C[White 6 should not be ignored by Black.
 Black continues with 'a' to 'd'.]
 (;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[qe]LB[qc:9][qd:8][rd:7][re:6]C[This is the same joseki as the variation of White 8, Black 9 played before White 6, Black 7, see there for continuation.])
 (;B[qc]
 ;W[qj]
 ;B[jc])
 (;B[qd]C[Black may play this way with support at top.])
 (;B[qe]LB[qd:A][rf:B]C['a' or 'b'.]
 (;W[qd]LB[qd:8][re:6]C[This is the same joseki as the variation of White 8 played before 6, see there for continuation.])
 (;W[rf]
 ;B[qc]
 ;W[qj]
 ;B[jc])))
 (;W[qc]LB[pc:b][qd:c][qe:a]C[White may play 6 when Black has a stone at top to prevent Black from solidifying his territory.
 Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[qe]LB[ob:a][pc:c][qg:b]C[White continues with 'a'. White 'b' is odd. White 'c' is a hopeful mistake.]
 (;W[ob]LB[pc:b][qg:a]C[Black continues with 'a' or 'b'. Black 'b' is a stronger move.]
 (;B[qg]
 ;W[mc])
 (;B[pc]
 ;W[pb]
 ;B[rc]
 ;W[rb]
 ;B[qd]
 ;W[qb]
 ;B[mb]
 ;W[rd]
 ;B[re]
 ;W[sc]LB[qg:a]C[Black no longer has to play 'a'.]))
 (;W[qg]C[White 8 is a mistake. The invasion of White 6 is lost.]
 ;B[pc]
 ;W[re]
 ;B[qd]
 ;W[rd]
 ;B[rc])
 (;W[pc]LB[nc:a][oc:b]C[White 8 hopes for a Black hane, but Black has a better play.
 Black continues with 'a'. Black 'b', the hane, is a mistake.]
 (;B[nc]LB[nb:A][oc:B]C[Black 9 seals White in building thickness. 'a' or 'b'.]
 (;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]LB[rd:a][qg:b]C[Black 'a' is sente, so White cannot aim at connecting at 'b'.])
 (;W[oc]
 ;B[nd]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[qg]))
 (;B[oc]C[White 9 is a mistake.]
 ;W[ob]LB[nb:A][nc:B]C['a' or 'b'.]
 (;B[nb]
 ;W[qd]LB[nd:A][re:B]C[Black has too many cutting points. 'a' or 'b'.]
 (;B[nd]
 ;W[re]
 ;B[pe]
 ;W[qg])
 (;B[re]
 ;W[nc]))
 (;B[nc]
 ;W[nb]
 ;B[mc]))))
 (;B[pc]C[Black 7 gives up considerable territory, but is consistent in emphasis (the top). Black ends in sente. If a handicap game, keeping situations simple is a good approach.]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]LB[qg:b][rg:a]C[White continues with 'a'. White 'b' is a minor mistake.]
 (;W[rg]
 ;B[og]
 ;W[ph]C[Locally White is far ahead])
 (;W[qg]LB[rf:a][og:b]C[White 12 is a mistake.
 Black continues with 'a'. Black 'b' fails.]
 (;B[rf]C[Right timing]
 ;W[rd]
 ;B[og]
 ;W[pi]
 ;B[oh]
 ;W[qj])
 (;B[og]LB[rf:a]C[Black 13 is a mistake. Black fails to take advantage of a good
 opportunity by first cutting at 'a'.]
 ;W[qb]
 ;B[pb]
 ;W[oh]LB[rf:a]C[White has a much better position (than the other variation where Black cuts at 'a' first rather than Black 13).]
 ;B[rf]C[The cut of Black 17 no longer works.]
 ;W[rg]
 ;B[rd]
 ;W[sf])))
 (;B[qd]C[Black 7 is a mistake.]
 ;W[pc]
 ;B[oc]
 ;W[ob]LB[nb:b][nc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]C[Black gote, & White 2 still has aji.
 Black's stones are very inefficiently placed.])
 (;B[nb]
 ;W[rd]C[Black does not have a good reply.])))
 (;W[pc]LB[oc:b][qc:c][qe:a]C[White hopes for a Black mistake ('b'). White continues with 'a'
 or 'c'.]
 (;B[qe]
 ;W[oc]LB[mc:a][qc:b]C[Black best continues with 'a'. Black 'b' is less advantageous.]
 (;B[mc]LB[mb:C][rc:A][nd:B]C[White lives on 'a'. Running out on 'b' is disadvantageous. White 'c' is a mistake.]
 (;W[rc])
 (;W[nd]
 ;B[md]
 ;W[ne]
 ;B[lf]
 ;W[mg]
 ;B[og]C[Keeping White under attack automatically lets Black take the right side.])
 (;W[mb]C[White 10 is a mistake.]
 ;B[nb]
 ;W[nc]
 ;B[lb]C[White is better off with the other variation.]))
 (;B[qc]C[Black 9 is not recommended.]
 ;W[qb]
 ;B[rc]
 ;W[lc]C[White gets an adequate position. Black is dissatisfied.]))
 (;B[oc]C[Black falls into the trap.]
 ;W[qc]LB[ob:B][qe:A]C['a' or 'b'.]
 (;B[qe]
 ;W[ob]LB[nb:b][nc:a]C[Black continues with 'a'. Black 'b' only makes matters worse.]
 (;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc])
 (;B[nb]C[Black compounds the mistake.]
 ;W[re]C[A lot of cutting points, but Black is the one being cut for a loss.]))
 (;B[ob]
 ;W[re]))
 (;B[qc]
 ;W[oc]
 ;B[qb]LB[lc:A][qe:B]C['a' emphasizes the top, 'b' the right side.]
 (;W[lc]
 ;B[qg])
 (;W[qe]
 ;B[od]
 ;W[lc]
 ;B[qd]))))
 (;B[og]LB[pe:B][ph:A]C['a' is an old-style joseki, 'b' is possible.]
 (;W[ph]LB[qe:B][of:A]C['a' or 'b' are possible.]
 (;B[of]
 ;W[qe]
 ;B[qd]
 ;W[ql]
 ;B[nc]C[Good result for White])
 (;B[qe]
 ;W[of]
 ;B[pe]
 ;W[rf]
 ;B[nf]
 ;W[re]
 ;B[qc]
 ;W[ql]LB[pe:9][qe:7][og:5]C[Same result as the variation where Black 7 and 9 are played before Black 5.]))
 (;W[pe]
 ;B[of]LB[qd:a][oe:c][qe:b]C[White 'a' and 'b' take a side hugher than in joseki giving a wall.
 White 'c' is a mistake difficult to punish.]
 (;W[qd]
 ;B[oe]
 ;W[qe]
 ;B[pc]
 ;W[ph])
 (;W[qe]
 ;B[oe]
 ;W[qd]
 ;B[pc]
 ;W[ph])
 (;W[oe]LB[qd:b][qe:a]C[White 8 is a mistake.
 Black continues with 'a'. 'b' is nonsense.]
 (;B[qe]
 ;W[qd]
 ;B[re]LB[qc:B][rd:A]C['a' or 'b' don't help..]
 (;W[rd]
 ;B[rf]
 ;W[qg]LB[pc:B][qc:A]C['a' or 'b',]
 (;B[qc]
 ;W[rc]LB[rb:B][pc:A]C['a' is possible, 'b' is a mistake.]
 (;B[pc]
 ;W[ne]
 ;B[rb]
 ;W[rg]
 ;B[sc]
 ;W[oh]
 ;B[mf])
 (;B[rb]LB[qb:b][pc:a]C['a' or 'b' don't help.]
 (;W[pc]
 ;B[od]
 ;W[ne]
 ;B[sc]
 ;W[qb]
 ;B[sd]
 ;W[qc]
 ;B[oc]
 ;W[ob]
 ;B[qa]
 ;W[pb]
 ;B[nc]LB[nb:a][oh:b]C['a' is correct. 'b' is a mistake.]
 (;W[nb]LB[mc:B][rg:A]C['a' or 'b' don't help.]
 (;B[rg]LB[mc:C][rh:A][pi:B][qi:D]C['a' is correct, 'b' and 'c' are inferior, 'd' is a mistake.]
 (;W[rh]
 ;B[mc]
 ;W[sg]LB[se:A][qh:B]C['a' or 'b' don't help.]
 (;B[se]
 ;W[sh])
 (;B[qh]
 ;W[ph]
 ;B[qi]
 ;W[se]))
 (;W[pi]
 ;B[qi]
 ;W[ph]
 ;B[qj]
 ;W[mc])
 (;W[mc]
 ;B[ph])
 (;W[qi]
 ;B[rh]LB[mc:B][oi:A]C['a' or 'b' cannot punish Black.]
 (;W[oi]
 ;B[mc]
 ;W[ri]
 ;B[mb]
 ;W[sh]
 ;B[se]
 ;W[sg]
 ;B[na]
 ;W[qh]
 ;B[oa]
 ;W[si]
 ;B[pa])
 (;W[mc]
 ;B[pi]
 ;W[qh]
 ;B[qj]
 ;W[ri]
 ;B[rj])))
 (;B[mc]
 ;W[rg]
 ;B[se]
 ;W[sg]LB[mb:A][sb:B]C['a' or 'b' don't help.]
 (;B[mb]
 ;W[sf]
 ;B[sb]
 ;W[ra]
 ;B[sa]
 ;W[ra])
 (;B[sb]
 ;W[ra]
 ;B[mb]
 ;W[sf]
 ;B[sa]
 ;W[ra])))
 (;W[oh]C[White 30 is a game-losing mistake.]
 ;B[mf]
 ;W[nf]
 ;B[ng]
 ;W[mg]
 ;B[nh]
 ;W[ni]
 ;B[mh]
 ;W[lg]
 ;B[me]))
 (;W[qb]C[White 18 is a mistake.]
 ;B[pc]
 ;W[sb]
 ;B[pb]
 ;W[ra]
 ;B[ne])))
 (;B[pc]
 ;W[ne]LB[rc:A][rg:B]C['a' is correct. 'b' is a mistake.]
 (;B[rc]
 ;W[rg]
 ;B[qc]
 ;W[sf]
 ;B[sd]
 ;W[oh]
 ;B[mf])
 (;B[rg]LB[qb:A][rh:B]C['a' is the correct punishment, 'b' fails.]
 (;W[qb]
 ;B[qc]
 ;W[rc]
 ;B[pb]
 ;W[qa]
 ;B[sb]
 ;W[rb]LB[pa:A][mc:B]C['a' is correct,
 'b' -> disaster for Black.]
 (;B[pa]LB[sa:B][sd:A][rh:C]C['a' secures for White an advantageous position.
 'b' creates onjly a disadvantageous ko.
 With 'c', Black gets an advantageous position.]
 (;W[sd]LB[sa:A][mc:B]C['a' or 'b' don't help.]
 (;B[sa]
 ;W[od]
 ;B[se]
 ;W[oc]
 ;B[sc]
 ;W[ra]
 ;B[sb]
 ;W[ob]
 ;B[sc]
 ;W[oa]
 ;B[ph])
 (;B[mc]
 ;W[rh]))
 (;W[sa]
 ;B[ra]
 ;W[od]
 ;B[sd]
 ;W[sa])
 (;W[rh]
 ;B[sd]
 ;W[sg]
 ;B[se]
 ;W[sh]
 ;B[sc]
 ;W[sf]
 ;B[ra]))
 (;B[mc]
 ;W[rh]))
 (;W[rh]
 ;B[rc]
 ;W[qi]))))
 (;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[oc]
 ;W[ne]
 ;B[rf]
 ;W[nc]
 ;B[ob]
 ;W[qb]
 ;B[mb]C[Bad for White.]))
 (;B[qd]
 ;W[qe]
 ;B[nc]
 ;W[oh]C[The three heavy Black stones are now cut off and make no sense.]))))
 (;B[qg]C[Possible, if Black wants to make White overconcentrated on the right.]
 ;W[re]
 ;B[qe]
 ;W[rf]
 ;B[rd]
 ;W[qc]
 ;B[qd]
 ;W[of]
 ;B[pe]
 ;W[qh]
 ;B[og]
 ;W[ph]
 ;B[nf]C[Joseki]))
 (;W[pe]LB[oe:a][qe:b]C[White 4 is a trick play. White must have the ladder to play this way.
 Black continues with 'a' if the ladder favors White, or 'b' with a favorable ladder.]
 (;B[oe]C[Black plays 5 here when the ladder favors White.]
 ;W[qe]LB[od:a][qd:b][pg:c]C[Black continues with 'a'. Black 'b' is an overplay. Black 'c' is wrong.]
 (;B[od]
 ;W[pg]
 ;B[of]
 ;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]LB[sb:b][rd:a]C[White continues safely with 'a', or provokes a fight with 'b'.]
 (;W[rd]C[White 16 is safe.]
 ;B[pb]
 ;W[qj]
 ;B[jc])
 (;W[sb]C[White 16 is a tough move.]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[ra]
 ;B[qi]
 ;W[og]
 ;B[rh]
 ;W[ng]
 ;B[ld]C[Black has solid footing for the fight ahead, while White's three stones are floating in the center.]))
 (;B[qd]C[Black 7 is an overplay.]
 ;W[od]LB[oc:c][nd:a][of:b]TR[rd]C[Black would like to play down from 7 (the triangle), but White b is a double atari, so Black must continue at 'a', 'b' or 'c'.]
 (;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[pb]C[White 12 is the tesuji that gives White the advantage.]
 ;B[nb]
 ;W[qc]
 ;B[rd]
 ;W[rc]C[Black ends up being captured.])
 (;B[of]
 ;W[oc]
 ;B[rd]
 ;W[qh]
 ;B[pc]
 ;W[md])
 (;B[oc]
 ;W[nd]LB[nc:A][pg:B]C[After 'a' Black is heavy.
 'b' was played by Cho Chikun against Kobayashi Satoru in the 2nd game of the 20th Kisei, not having the ladder, but support on the right.]
 (;B[nc]
 ;W[md]
 ;B[of]
 ;W[qh])
 (;B[pg]
 ;W[pc]
 ;B[qc]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[oh]
 ;W[me]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[nh]
 ;B[mi]LB[lf:A][ph:B]C[This moves breaks both ladders on 'a' and 'b'.]
 ;W[ph]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri]
 ;B[sh]
 ;W[sg]
 ;B[pi]
 ;W[si]
 ;B[ph]
 ;W[pj]
 ;B[oi])))
 (;B[pg]
 ;W[od]))
 (;B[qe]C[Black must have the ladder to play this way.]
 ;W[oe]LB[qd:A][qg:B]C['a' is correct, 'b' is inferior.]
 (;B[qd]LB[pg:A][qg:B]C['a' is correct, 'b' helps Black.]
 (;W[pg]
 ;B[nc]
 ;W[of])
 (;W[qg]LB[nd:A][pg:B]C['a' is correct, Black sacrifices one stone to get a good position.
 'b' is a mistake, White develops strong groups on both sides, but the Black center stones remain heavy.]
 (;B[nd]
 ;W[ne]
 ;B[me]
 ;W[od]
 ;B[oc]
 ;W[og]
 ;B[md]C[The result, Black territory and thickness, greatly favors Black.])
 (;B[pg]
 ;W[ph]
 ;B[nf]
 ;W[pi]
 ;B[ng]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[me])))
 (;B[qg]
 ;W[qd]
 ;B[rf]
 ;W[re]
 ;B[qf]
 ;W[pc]
 ;B[rd]
 ;W[od]
 ;B[rc]
 ;W[kc]C[Black has a low, overconcentrated position, White has got more
 points.])))
 (;W[qe]
 ;B[pe]LB[qc:B][qd:C][pg:A]C['a', 'b' or 'c' don't give White a good position.
+]
 (;W[pg]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[og]
 ;W[ph]
 ;B[qd]
 ;W[rf]
 ;B[re]
 ;W[sg])
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi])
 (;W[qd]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi])))
 (;B[qh]LB[nc:c][qc:a][nd:b][qd:g][of:e][ph:d][dp:f]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 White usually continues with 'a', 'b', 'c' or tenuki 'f'.
 White 'd' is an emergency move giving Black many points and shouldn't be used without an exact reason. White support in the lower right or center will be helpful.
 White 'e' has been put in disfavour by some pros recently, only good if White already as many stones in the middle, as he gets a wall in gote or with a hole. 'e' also leads to a punishment, if Black doesn't have the ladder.
 'g' is good, if Black can make no big extension on either side.
+]
 (;W[qc]LB[pc:b][qd:a]C[White enters at the 3-3 point in the overwhelming majority of cases. The one-space jump common with amatuers is not recommended.
 Black continues with 'a' or 'b'. Black needs support at the top to play 'b'.
+]
 (;B[qd]
 ;W[pc]LB[oc:c][rc:b][od:a]C[Black continues with 'a'. Black 'b' represents a change in strategy from influence to territory. Black 'c' is a mistake (can call it a trickmove).]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 (;B[qe]
 ;W[nc]LB[lc:C][mc:F][me:B][of:D][pf:G][rf:E][qk:A]TR[qh]C[
 * Joseki *
 With a White stone on the squared position, Black can do nothing bigger than extend to 'a'.
 Later, Black can aim on 'b' or 'c', White may jump to 'd', aim at 'e' or enlargen
 his group on F.
 As the triangled extension from his wall is near, Black shall
 not immediately capture the White stone on G.
 ]MA[pp]
 (;AW[pp]LB[qk:A][qn:B]C['a' is coorect, 'b' just invites an invasion into the moyo Black makes.
+]
 (;B[qk]LB[qd:5]C[Very slow move. So the whole top right corner joseki after Black 5 fell into professionals' disfavor.
 ])
 (;B[qn]
 ;W[np]LB[pk:A][rp:B]C['a' and 'b' don't secure the moyo.
+]
 (;B[pk]
 ;W[qi]C[White will survive.
 ])
 (;B[rp]
 ;W[qq]
 ;B[pl]
 ;W[qj]C[White can't be killed.
 ])))
 (;B[me]LB[mc:A]C[White 'a' is correct, tenuki is not recommended.
+]
 (;W[mc]C[
 * Joseki *])
 (;B[mc]LB[mb:B][nb:A]C['a' is correct, 'b' is not recommended.
+]
 (;W[nb])
 (;W[mb]
 ;B[lc]LB[lb:A][nb:B]C[After 'a' or 'b', Black has just been unnecessarily strengthened.
+]
 (;W[lb]
 ;B[kc]
 ;B[ob]C[Later, Black closes the top side in sente.
+]
 ;W[oc]
 ;B[nb]
 ;W[pb]
 ;B[kb])
 (;W[nb]))))
 (;B[lc]LB[mc:A][nd:B]C[White usually answers on 'a', but 'b' is also possible. If White tenukis, Black plays 'b'.
+]
 (;W[mc]
 ;B[ld])
 (;W[nd]
 ;B[ne]
 ;W[me]
 ;B[md]
 ;W[mb]
 ;B[le]
 ;W[mf])
 (;B[nd]))
 (;W[of])
 (;W[rf]LB[pf:B][sf:A]C[If Black is strong on the lower right side, he can try to kill the White invasion stones on 'a', else he can cover on 'b'.
+]
 (;B[sf]LB[sg:A][rh:B]TR[rj]C[White 'a' or, with an additional stone on the triangled position, 'b'.
+]
 (;W[sg]
 ;B[se]
 ;W[rh]
 ;B[pf]
 ;W[rg]
 ;B[qg]
 ;W[ri])
 (;AW[rj]
 ;W[rh]))
 (;B[pf]
 ;W[se])))
 (;B[rf]C[Old joseki]
 ;W[nc]))
 (;B[rc]C[Black 7 emphasizes territory, a change in original strategy.]
 ;W[rb]
 ;B[rd]LB[nc:b][oc:a]C[White continues with 'a' or 'b'.]
 (;W[oc]
 ;B[pf]
 ;W[lc])
 (;W[nc]
 ;B[od]
 ;W[mb]
 ;B[pg]))
 (;B[oc]LB[rc:A][rd:B]C[Black 7 is a mistake.
 'a' is the usual punishment, 'b' is slightly inferior.
+]
 (;W[rc]LB[od:B][rd:A]C['a' closes the right, 'b' the top side.
+]
 (;B[rd]LB[nc:B][od:A]C['a' is correct, 'b' is inferior.
+]
 (;W[od]LB[nc:B][oe:A]C['a' is correct. 'b' is a mistake.
+]
 (;B[oe]
 ;W[nd]
 ;B[pf]
 ;W[nc]C[Really good for White])
 (;B[nc]
 ;W[pe]
 ;B[oe]
 ;W[nd]
 ;B[md]
 ;W[ne]
 ;B[of]
 ;W[nf]LB[qe:A][pf:B]C['a' or 'b' don't help.
+]
 (;B[qe]
 ;W[qg])
 (;B[pf]
 ;W[qe])))
 (;W[nc]
 ;B[od]
 ;W[ob]LB[rc:8][rd:9]C[Compared to White 8 onto 9, White has lost points and aji.
 ]))
 (;B[od]LB[rd:B][re:A]C['a' is better than 'b'.
+]
 (;W[re]
 ;B[rd]
 ;W[sd]
 ;B[pf]LB[pg:B][qg:A]C['a' is correct, 'b' is bad.
+]
 (;W[qg]
 ;B[pg]
 ;W[rh]
 ;B[id]
 ;W[qi]
 ;B[ph]
 ;W[pi])
 (;W[pg]
 ;B[qg]
 ;W[pe]
 ;B[of]
 ;W[qe]
 ;B[oe]LB[id:B][rg:A]C['a' lives, 'b' dies.
+]
 (;W[rg]
 ;B[rh]
 ;W[sf]
 ;B[ob]
 ;W[pb]
 ;B[hc])
 (;W[id]
 ;B[ob]
 ;W[rg]
 ;B[rh]
 ;W[sf]
 ;B[ra])))
 (;W[rd]
 ;B[pf]
 ;W[qg]
 ;B[pg]
 ;W[rh]
 ;B[id]
 ;W[qi]
 ;B[ph]
 ;W[rj])))
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]LB[nc:A][od:B]C['a' or 'b'.
+]
 (;W[nc]LB[ob:B][od:A]C['a' is correct. 'b' is a mistake.]
 (;B[od]
 ;W[ob])
 (;B[ob]
 ;W[od]
 ;B[nb]
 ;W[nd]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[rf]
 ;B[pf]
 ;W[se]
 ;B[pe]
 ;W[pg]
 ;B[of]
 ;W[mf]
 ;B[og]
 ;W[ph]
 ;B[qg]
 ;W[nh]
 ;B[oh]
 ;W[pi]
 ;B[oi]
 ;W[qi]))
 (;W[od]
 ;B[nc]
 ;W[rf]
 ;B[oe]
 ;W[se]
 ;B[nd]))))
 (;B[pc]C[Black 5 when a supporting stone at top exists.]
 ;W[qd]
 ;B[pe]LB[qb:b][qe:d][pf:c][rf:a]C[White continues with 'a' to 'c'. 'd' is a mistake.]
 (;W[rf]
 ;B[og]C[
 * Joseki *])
 (;W[qb]LB[pf:a][og:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pf]
 ;W[rf]LB[pb:A][oh:B]C[Black continues with 'a' to secure much territory or 'b' to avoid being cut.]
 (;B[pb]
 ;W[pg]C[If the direct cut is good depends on the positions in the center and lower right.]
 ;B[qg]
 ;W[og]
 ;B[pj])
 (;B[oh]
 ;W[pb]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[oc]
 ;B[od]
 ;W[ob]
 ;B[mc]))
 (;B[og]LB[pb:a][dp:b]C[Black 9 is not recommended. White continues with 'a'. Playing elsewhere is not recommended.]
 (;W[pb])
 (;W[]C[White plays elsewhere; not recommended.]
 ;B[pb]
 ;W[rf]C[White 12 is submissive, but now necessary.])))
 (;W[pf]C[White 8 was common when this pattern first appeared.]
 ;B[qe]
 ;W[re]LB[rd:a][rf:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rd]LB[rc:a][rg:b]C[Black 11 is the tesuji for this situation.
 White continues with 'a'. White 'b', letting Black capture the two stones, is good only in the rare middle-game case, that White can create a lot of territory on the right side, while the situation on the top is no more promising for Black.]
 (;W[rc]C[White 12 is the only move.]
 ;B[rf]
 ;W[sd]LB[of:a][rg:b]C[Black continues with 'a'. 'b' is a mistake.]
 (;B[of]
 ;W[rg]
 ;B[pg]
 ;W[sf]LB[ng:A][qg:B]C['a' is joseki. 'b' is not absolutely necessary.]
 (;B[ng]
 ;W[oh]
 ;B[og]LB[pb:C][lc:A][mc:B]C[Later, White invades on 'a' or 'b'. Black wants to forestall the invasion, e.g. on 'c'.]
 (;W[lc]
 ;B[kc]
 ;W[nc]
 ;B[ne]
 ;W[kb]
 ;B[jb]
 ;W[kd]
 ;B[jc]
 ;W[md]
 ;B[ke]
 ;W[ob]
 ;B[pb]
 ;W[mb])
 (;W[mc]
 ;B[ld]
 ;W[pb]
 ;B[ob]
 ;W[oc]LB[qb:B][nc:A]C['a' is right, 'b' is wrong.]
 (;B[nc]
 ;W[nb]
 ;B[od]
 ;W[oa])
 (;B[qb]
 ;W[oe]
 ;B[pa]
 ;W[od]
 ;B[pb]
 ;W[nb])))
 (;B[qg]
 ;W[rf]
 ;B[ng]
 ;W[oh]
 ;B[og]))
 (;B[rg]
 ;W[of]
 ;B[pb]
 ;W[qb]
 ;B[md]
 ;W[oi]
 ;B[qk]
 ;W[lf]C[White is better.]))
 (;W[rg]
 ;B[se]
 ;W[rf]
 ;B[rc]
 ;W[nf]))
 (;B[rf]C[Under ordinary circumstances, Black 11 is a mistake.]
 ;W[rg]
 ;B[rd]
 ;W[sf]C[White gladly abandons the two corner stones.]
 ;B[rc]LB[oe:A][nf:B]C['a' is a trick move which builds White influence if Black isn't tricked. 'b' keeps the top open for later invasions.]
 (;W[oe]LB[nd:A][dp:B]C['a' is necessary, Tenuki 'b' is a mistake.]
 (;B[nd]
 ;W[ne]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[pi])
 (;B[dp]
 ;W[qb]LB[pb:A][rb:B]C['a' gives some, 'b' much territory to White.]
 (;B[pb]
 ;W[rb])
 (;B[rb]
 ;W[pb]
 ;B[ob]
 ;W[oc])))
 (;W[nf])))
 (;W[qe]
 ;B[pf]
 ;W[pg]C[This move doesn't work.]
 ;B[qg]
 ;W[og]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[ra]
 ;B[pi]LB[rf:A][mg:B]C[This is sente against the middle as well as the corner. White
 defends the corner on 'a' or has a ko in the corner after 'b'.]
 (;W[rf]
 ;B[ni])
 (;W[mg]
 ;B[rf]
 ;W[re]
 ;B[sd]
 ;W[rg]
 ;B[rc]LB[sb:B][sf:A]C['a' leads to ko. 'b' leads to death.]
 (;W[sf]
 ;B[sb]
 ;W[rh]
 ;B[ri]
 ;W[rd]C[Ko.])
 (;W[sb]
 ;B[se]
 ;W[sf]
 ;B[qa]
 ;W[rh]
 ;B[ri]
 ;W[rf]
 ;B[sh])))))
 (;W[nd]LB[jd:C][qe:B][pf:A]C[This move is bad, if there is a Black stone on or near 'c'.
 'a' or 'b'. 'a' is the easy joseki, 'b' leads to an equal fight.
 'c' goes for outside influence.]
 (;B[pf]LB[pc:C][qc:B][pe:D][pg:A]C[
 'a' is joseki,
 Playing 'b' or 'c' without 'a' at first is too early. 'd' gives
 the corner for a wall to the right.]
 (;W[pg]LB[qg:A]
 ;B[qg]
 ;W[pc]LB[qc:C][qe:A][of:B]TR[nd][pg]C['a' and 'b' are joseki. 'c' is a mistake because of the two marked stones.]
 (;B[qe]
 ;W[qc]LB[lc:B][oc:D][of:A][rf:C]TR[jc][jd]C['a' concludes the joseki, but is oftenly omitted for sente.
 Later or immediately, White continues on 'b'.
 A followup move for White is 'c'.
 If there is a Black stone on one of the marked stones, Black can cut on D.]
 (;B[of]C[
 * Joseki *])
 (;B[lc]LB[nb:A][nc:B]C['a' takes territory, 'b' aims to attack Black or push into the center.]
 (;W[nb])
 (;W[nc]))
 (;W[rf]
 ;B[re]
 ;W[of]
 ;B[pe]LB[lc:A][nd:4][ne:B]C[A and 'b' are now sente for Black. The White influence is now better than if he had played 4 on sansan.]))
 (;B[of]
 ;W[qc]
 ;B[qd]
 ;W[od]
 ;B[rc]
 ;W[rb]LB[rd:A]C[Later, White captures on 'a' in sente.]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[rf])
 (;B[qc]
 ;W[pe]
 ;B[of]
 ;W[qd]
 ;B[od]
 ;W[oe]
 ;B[oc]
 ;W[nf]
 ;B[og]
 ;W[nc])
 (;B[rf]C[Also joseki
 Tenuki is best answer for White]
 (;W[qc]C[Black can play tennuki now and White has no good moves in this area.])
 (;W[hc]
 ;B[qc]
 ;W[oc]
 ;B[qb]
 ;W[of]
 ;B[pe]
 ;W[kd]C[Black's territory is big, but he is slightly overconcentrated])))
 (;W[qc]LB[pc:B][qe:A]C['a' is joseki, 'b' is questionable.]
 (;B[qe]
 ;W[pc])
 (;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[rf]
 ;B[pg]
 ;W[jc]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[ra]
 ;B[mc]LB[nd:4]C[The result is considered playable, because White 4 is high and can be undermined.]))
 (;W[pc]LB[qc:B][qe:A]TR[pg]C['a' reverts to joseki. 'b' is a variation and not a mistake, because White made the mistake, not to play on the marked point before.]
 (;B[qe]
 ;W[qc]LB[oc:A]TR[jc][jd]C[If there is a Black stone on one of the marked points, the Black cut on 'a' is possible.])
 (;B[qc]
 ;W[pg]LB[of:A][qg:B]C['a' is correct, 'b' leads to a disaster.]
 (;B[of]
 ;W[qg]LB[oc:A][qe:B]C['a' and 'b' both lead to results which favor Black.]
 (;B[oc])
 (;B[qe]
 ;W[oc]
 ;B[qb]
 ;W[re]
 ;B[rd]
 ;W[nf]
 ;B[og]
 ;W[ph]
 ;B[kd]))
 (;B[qg]
 ;W[pe]
 ;B[of]
 ;W[qd]
 ;B[od]
 ;W[oe]
 ;B[oc]
 ;W[nf]
 ;B[og]
 ;W[pb])))
 (;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[od]
 ;W[pg]
 ;B[of]
 ;W[qg]
 ;B[qd]))
 (;B[qe]
 ;W[pf]
 ;B[oe]LB[qc:B][pe:C][re:D][ph:A]C['a', 'b' or 'c'. 'd' is a mistake.]
 (;W[ph]
 ;B[qi]
 ;W[qc]
 ;B[pc]
 ;W[re]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[nf]
 ;B[ne]
 ;W[me]
 ;B[of]
 ;W[og]
 ;B[qb]
 ;W[mf])
 (;W[qc]
 ;B[pc]
 ;W[re]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[nf]LB[qb:A][of:B]C['a' is correct. 'b' is a mistake.]
 (;B[qb]
 ;W[of]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[mg]
 ;W[ob]LB[pb:A][rg:B]C['a' is correct, any other play like 'b' is a mistake.]
 (;B[pb]
 ;W[ph])
 (;B[rg]
 ;W[rf]
 ;B[oh]
 ;W[od]
 ;B[pe]
 ;W[pb]))
 (;B[of]
 ;W[og]
 ;B[ng]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[ob]
 ;W[od]))
 (;W[pe]
 ;B[od]
 ;W[qd]
 ;B[qc]
 ;W[re]
 ;B[rd])
 (;W[re]
 ;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[od]LB[rf:A]TR[rd][re]C[White may want to play 'a' instead of the marked exchange later.
 Having lost this option is a disadvantage.]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[og]
 ;B[le]
 ;W[kc]
 ;B[jd]
 ;W[pc]
 ;B[rf]
 ;W[rg]
 ;B[se]
 ;W[qg]
 ;B[pb]LB[oc:A][qc:B]TR[rd]C[This move, forcing White into a small position and bad shape on top, would be impossible without the triangled present, White gave before. 'a' is now necessary, 'b' just makes the mistake bigger.]
 (;W[oc]
 ;B[qc]
 ;W[jc]
 ;B[ld]
 ;W[lc]
 ;B[ob]
 ;W[mc]
 ;B[id]
 ;W[qj])
 (;W[qc]
 ;B[oc]
 ;W[rc]
 ;B[lc]
 ;W[nc]
 ;B[ob]
 ;W[nb]
 ;B[rb])))
 (;B[jd]
 ;W[qd]
 ;B[qc]
 ;W[pc]
 ;B[qe]
 ;W[rd]
 ;B[oc]
 ;W[pb]
 ;B[od]))
 (;W[nc]LB[nd:B][oe:C][pf:A]C['a' is joseki. 'b' is rare. 'c' is not recommended,
+]
 (;B[pf]LB[pc:C][qc:A][pg:B]C['a' is joseki. 'b' too but can be difficult. 'c' is disadvantageous.]
 (;W[qc]LB[pc:B][qd:A]C['a' is joseki. 'b' can be unfavorable.]
 (;B[qd]
 ;W[pc]
 ;B[od]LB[oc:B][rc:A][rd:C]C['a' or 'b'.
 'c' is a mistake.]
 (;W[rc]LB[rd:A][dp:B]C['a' or tenuki 'b'.]
 (;B[rd]C[
 * Joseki *]
 ;B[lc]LB[nb:B][mc:A]C[Later, 'a' sente leaving aji, 'b' gote.]
 (;W[mc]
 ;B[ld]
 ;B[sc]C[Later, Black can use the aji.]
 ;W[sb]C[White must not answer here.]
 ;B[oc]
 ;W[ob]
 ;B[nb])
 (;W[nb]))
 (;B[dp]LB[rd:A]C[Later, White can play on 'a'.]
 ;W[rd]
 ;B[qg]))
 (;W[oc])
 (;W[rd]
 (;B[rc]LB[rb:A][re:B]C['a' or 'b' give the same result.]
 (;W[rb]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc]
 ;W[re]C[Good for Black])
 (;W[re]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc]
 ;W[rb]))
 (;B[re]
 ;W[rc]C[Good for White])))
 (;B[pc]
 (;W[qd]LB[pc:7][pe:A][qe:B]TR[jd]C[Black 7 is especially good with an additional stone on the triangled
 point.
 'a' is usual.
 'b' is complicated.]
 (;B[pe]LB[pb:B][rf:A]C[White 'a' is usual, 'b' is rare.]
 (;W[rf]
 ;B[pb]
 (;W[qb]LB[jc:B][lc:A]C['a' is correct, any other pincers like 'b' are not.]
 (;B[lc]LB[pg:A]C[Later, White 'a' is useless.]
 ;W[pg]
 ;B[qg]
 ;W[og]
 ;B[pj]
 ;W[mg]
 ;B[nf]C[Don't avoid this move!]
 ;W[ng]LB[mc:B][ld:A]C[Later, White 'a' or 'b' fail.]
 (;W[ld]
 ;B[mc]
 ;W[md]
 ;B[nd])
 (;W[mc]
 ;B[ld]
 ;W[ne]
 ;B[me]LB[nd:B][mf:A]C['a' or 'b' don't capture.]
 (;W[mf]
 ;B[nd])
 (;W[nd]
 ;B[of]
 ;W[mf]
 ;B[mb]
 ;W[nb]
 ;B[lb]
 ;W[pa]
 ;B[oa]
 ;W[qa]
 ;B[ob]
 ;W[na]
 ;B[hd]C[Seki, Black wall transferred to the left, White center group heavy.])))
 (;B[jc]
 ;W[pg]
 ;B[qg]
 ;W[og]
 ;B[pj]
 ;W[ne])
 (;B[oh]C[Also joseki])
 (;B[qg]C[Most solid]))
 (;W[qg]
 ;B[pg]
 (;W[jd]
 ;B[pi]
 ;W[qb]C[Korean joseki])
 (;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[jd]C[Joseki])))
 (;W[pb]
 ;B[qe]
 ;W[ob])
 (;W[qe]C[Also joseki]))
 (;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]LB[pb:A][pg:B]C[
 'a' or 'b'.]
 (;B[pb]LB[qb:C][jd:B][qg:A]C['a', 'b' or 'c'. 'c' is basic joseki, but makes it easy for Black.]
 (;W[qg]
 ;B[pg]LB[jd:B][rh:A]C['a' or 'b'.]
 (;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]LB[jd:A][kd:B]C['a' or 'b'.]
 (;W[jd])
 (;W[kd]))
 (;W[jd]LB[rb:B][rh:A]C['a' is correct, 'b' is not recommended.]
 (;B[rh]
 ;W[qb]
 ;B[pl])
 (;B[rb]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[fc]
 ;B[rj]
 ;W[rc])))
 (;W[jd]
 ;B[rb]
 ;W[qg]LB[pg:A][ph:B]C['a' or 'b'.]
 (;B[pg]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[rj]
 ;B[qk])
 (;B[ph]
 ;W[rh]
 ;B[ri]
 ;W[rj]
 ;B[sh]
 ;W[sg]
 ;B[rg]
 ;W[pg]
 ;B[og]
 ;W[rh]
 ;B[si]
 ;W[qi]
 ;B[rg]
 ;W[pi]LB[oh:A][rh:B]C['a' is correct. 'b' is a mistake.]
 (;B[oh]
 ;W[rh]
 ;B[kd]
 ;W[sj]
 ;B[kc])
 (;B[rh]
 ;W[oh]
 ;B[sf]
 ;W[sj]
 ;B[rd]
 ;W[sg])))
 (;W[qb]
 ;B[lc]C[
 * Joseki *]))
 (;B[pg]
 ;W[kc])))
 (;W[pg]C[Old joseki.]
 ;B[qg]
 ;W[pe]
 ;B[of]
 ;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[rf]
 ;W[re]
 ;B[qf]
 ;W[pb]
 ;B[ne]
 ;W[od]C[Equal (joseki).])))
 (;W[pg]
 ;B[qg]LB[pc:A][qc:B][pe:C]C['a' is joseki. 'b' is an older joseki that takes the corner in gote. 'c' is also joseki.
+]
 (;W[pc]LB[qc:B][qe:A]C['a' is simple, but gives up the corner. 'b' takes huge outside influence.]
 (;B[qe]
 ;W[qc]LB[of:A][rf:B]C['a' concludes the joseki, but is oftenly omitted for sente. Then White can later followup on 'b'.]
 (;B[of]C[
 * Joseki *])
 (;W[rf]C[Later.]
 ;B[re]
 ;W[of]
 ;B[pe]))
 (;B[qc]
 ;W[pe]
 ;B[of]
 ;W[qd]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[qe]
 ;B[nd]
 ;W[nf]
 ;B[og]
 ;W[oc]LB[mc:A][ld:B]C['a' and 'b' give the same result.]
 (;B[mc]
 ;W[mb]
 ;B[ld]
 ;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[lb]
 ;W[nb]
 ;B[oh]
 ;W[mf]
 ;B[kd])
 (;B[ld]LB[lc:A][rc:B]C['a' is correct. 'b' is too early, fails to create some aji on the top side.]
 (;W[lc]LB[mc:A][rc:C][rf:B]C['a' is usual, 'b' complicated.
 'c' is a mistake.]
 (;B[mc]
 ;W[mb]
 ;B[md]
 ;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[rf]
 ;W[re]
 ;B[se]
 ;W[rd]
 ;B[lb]
 ;W[na]LB[kc:A][ph:B]C[With a position in the top left corner, Black takes on 'a', in the lower right corner, on 'b'.]
 (;B[kc]
 ;W[ph])
 (;B[ph]
 ;W[kc]))
 (;B[rf]
 ;W[rc]
 ;B[qb]
 ;W[re]
 ;B[se]
 ;W[rd]
 ;B[rb]
 ;W[rg]
 ;B[mc]
 ;W[mb]
 ;B[md]
 ;W[lb]LB[ng:B][sg:A]C['a' or 'b'.]
 (;B[sg]
 ;W[sf]
 ;B[nb]
 ;W[ob]
 ;B[rf]
 ;W[rh]
 ;B[sc]
 ;W[sf]
 ;B[oa]
 ;W[oh]
 ;B[ng]
 ;W[qi]
 ;B[pb]
 ;W[hc])
 (;B[ng]
 ;W[rh]
 ;B[kc]
 ;W[jc]LB[kb:B][kd:A]C['a' is better than 'b'.]
 (;B[kd]
 ;W[kb]
 ;B[sf]
 ;W[qi]
 ;B[ph]
 ;W[sg]
 ;B[ri]
 ;W[sd]
 ;B[qj]
 ;W[sf]
 ;B[pi])
 (;B[kb]
 ;W[kd]
 ;B[jb]
 ;W[mf]
 ;B[le]
 ;W[ke]
 ;B[lf]
 ;W[kf]
 ;B[lg]
 ;W[ic]
 ;B[nb]
 ;W[ob]
 ;B[oa]
 ;W[na]
 ;B[pa]
 ;W[ib]
 ;B[pb]
 ;W[qi]
 ;B[ph]
 ;W[rj])))
 (;B[rc]
 ;W[le]
 ;B[mf]
 ;W[ng]
 ;B[oh]
 ;W[me]
 ;B[md]
 ;W[kd]))
 (;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[rf]
 ;W[re]
 ;B[se]
 ;W[rd]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[oh]))))
 (;W[qc]
 ;B[pc]
 ;W[pe]
 ;B[of]
 ;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[rf]LB[od:A][re:B]C['a' is enough, 'b' risks a ko.]
 (;W[od])
 (;W[re]
 ;B[qf]
 ;W[od]
 ;B[pb]
 ;W[qb]
 ;B[ne]
 ;W[lc]
 ;B[rd]
 ;W[rc]
 ;B[se]LB[oc:A][dp:B]C['a' is necessary, tenuki 'b' is a mistake.]
 (;W[oc])
 (;W[dp]
 ;B[ra])))
 (;W[pe]C[Old style]
 ;B[of]LB[qd:B][oe:A]C['a' or 'b' are joseki.
+]
 (;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[rf]
 ;W[od]
 ;B[pc]
 ;W[qc]C[Usually good for Black, because there are lot of forcing moves, reducing White's corner.])
 (;W[qd]
 ;B[oe]
 ;W[qe]
 ;B[oc]
 ;W[qc]
 ;B[nb]
 ;W[pb]C[Later sente.
 ])))
 (;W[pc]
 ;B[qc]LB[qd:A][pg:B]C['a' or 'b'.]
 (;W[qd]
 ;B[qe]
 ;W[rd]LB[oc:B][re:A]
 (;B[re]
 ;W[od]
 ;B[pe]
 ;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[oc])
 (;B[oc]
 ;W[pb]
 ;B[od]LB[ob:A][re:B]C['a' takes the top side, 'b' the right side.]
 (;W[ob]
 ;B[re]
 ;W[rc]
 ;B[lc])
 (;W[re]
 ;B[ob]LB[qb:A][pe:B]C['a' or 'b']
 (;W[qb]
 ;B[qg]
 ;W[pe]
 ;B[oe])
 (;W[pe]
 ;B[oe]LB[qb:A][pg:B]C['a' or 'b'.]
 (;W[qb]
 ;B[pg])
 (;W[pg]
 ;B[of]
 ;W[qg]
 ;B[qb]
 ;W[ph])))))
 (;W[pg]
 ;B[oc]C[No good follow-up for White.])))
 (;B[nd]LB[qc:B][md:A]C[Rare
+]
 (;W[md]
 ;B[ne]LB[oc:B][pc:A][qc:C]C['a' is correct , 'b' and 'c' are not.
+]
 (;W[pc]
 (;B[oc]C[Crude]
 ;W[ob]
 ;B[od]
 ;W[mb]
 ;B[qc]
 ;W[pb]
 ;B[me]
 ;W[ld]
 ;W[qd]C[Later...
+]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[rc]C[Black is overconcentrated.
 ])
 (;B[qc]C[Correct.]
 ;W[oc]
 ;B[qd]
 ;W[jc]
 ;B[pg]C[Modern joseki.]))
 (;W[oc]
 ;B[pc]LB[od:B][pg:A]C['a' is possible. 'b' is a serious mistake.]
 (;W[pg]
 ;B[ph]
 ;W[og]
 ;B[od]C[Good for Black.])
 (;W[od]
 ;B[oe]
 ;W[pe]
 ;B[rd]
 ;W[pb]
 ;B[qb]
 ;W[ob]
 ;B[me]
 ;W[ld]
 ;B[pf]
 ;W[qe]
 ;B[qg]))
 (;W[qc]
 ;B[oc]
 ;W[qd]
 ;B[mc]LB[re:A]C[The result isn't equal because of the Black aji on 'a'.]))
 (;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[od]
 ;W[mc]
 ;B[nb]
 ;W[pb]
 ;B[lc]LB[mb:A][md:B]C['a' is correct. 'b' is a mistake.]
 (;W[mb]
 ;B[md]C[
 ])
 (;W[md]
 ;B[mb]
 ;W[me]
 ;B[rd]C[White dies in the corner and is hunted outside.])))
 (;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[pg]LB[oe:5][qh:3]C[Black 3 is overconcentrated now, so Black 5 was wrong.
 ]))
 (;W[ph]LB[pi:a][qi:b]C[Black continues with 'a' or 'b'.
+]
 (;B[pi]LB[pg:a][oh:b]C[White continues with 'a' or 'b'.]
 (;W[pg]LB[nd:B][qe:C][re:E][oi:D][qj:A]C['a' is joseki, 'b' and 'c' are possible, 'd' aims for a huge influence, but gives too much territory.
 'e' if Black is in the lower right.]
 (;B[qj]
 ;W[nd]LB[rd:A][ne:B]C['a' or 'b'.]
 (;B[rd]LB[rh:A][dp:B]C['a' is joseki, tenuki 'b' is wrong.]
 (;W[rh]C[White forestalls the connection.]
 ;B[nc]
 ;W[mc]
 ;B[oc]
 ;W[md]
 ;B[ni]C[
 * Joseki *])
 (;W[dp]
 ;B[rf]
 ;W[rg]
 ;B[qg]
 ;W[rh]
 ;B[qi]
 ;W[re]
 ;B[qe]
 ;W[sf]
 ;B[pf]))
 (;B[ne]LB[qc:A][me:B]C['a' is correct, 'b' is not good.]
 (;W[qc]
 ;B[qd]LB[pc:A][od:B]C['a' is correct, 'b' is a trick play.]
 (;W[pc]
 ;B[od]
 ;W[oc]
 ;B[md]
 ;W[nc]
 ;B[of])
 (;W[od]LB[pc:A][oe:B]C['a' is correct, 'b' is being tricked.]
 (;B[pc]
 ;W[oe]
 ;B[nb])
 (;B[oe]
 ;W[pc]
 ;B[pe]
 ;W[md])))
 (;W[me]
 ;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[md]
 ;W[nc]
 ;B[ld]
 ;W[mf]
 ;B[og]C[The fight is good for Black.])))
 (;B[nd]C[
 * Joseki *]
 ;W[qi]
 ;B[qj]
 ;W[ri]
 ;B[pj]
 ;W[rh]LB[qe:A][qn:B]C['a' or 'b'.]
 (;B[qe])
 (;B[qn]))
 (;B[qe]
 ;W[qi]
 ;B[qj]
 ;W[ri]
 ;B[pj]
 ;W[rh]LB[qn:A]C[If 'a' is sente, Black plays 'a' first before continuing the joseki.]
 ;B[rf]
 ;W[rg]
 ;B[pf])
 (;B[oi]C[Black 7 is a mistake, because it misses all points of the correct variations of which to take one is necessary.]
 ;W[nd]LB[rd:A][oi:7]C[Black 7 is questionable, because Black cannot threaten to connect on 'a' like in the joseki.]
 ;B[ne]
 ;W[qc]LB[pc:B][md:A][qd:C]C[White 10 is nice timing. Black continues with 'a'. In this position 'b' and 'c' are mistakes.]
 (;B[md]LB[nc:A][pc:B]C['a' is better than 'b'.]
 (;W[nc]
 ;B[mc]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[of]
 ;W[qd]
 ;B[mi]LB[oi:7]C[Now Black 7 makes some sense as part of Black's influence.
 Still it was a mistake, as White has much territory and sente, while the two squared Black stones have zero effect.]MA[od][pd])
 (;W[pc]
 ;B[od]LB[nc:A][qd:B]C['a' or 'b'.]
 (;W[nc]
 ;B[oc]
 ;W[qd]
 ;B[nb])
 (;W[qd]
 ;B[nc])))
 (;B[pc]
 ;W[qd]
 ;B[pe]LB[qb:A][qi:B]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[qb]
 ;B[me]
 ;W[pb]LB[oi:7][qj:A]C[Black 7 would be better on 'a' now. Now it is neither connecting the two Black groups nor protecting the cut.])
 (;W[qi]C[White 14 is an overplay.]
 ;B[qe]
 ;W[re]
 ;B[rd]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[rg]
 ;W[me]
 ;B[oh]LB[kc:A][qj:B]C['a' is correct. 'b' is a mistake.]
 (;W[kc]C[White settles his top stones.]
 ;B[qj]
 ;W[ri]
 ;B[rj]C[End of sequence.]
 ;W[rh]C[White cannot capture the Black stones.]
 ;B[qg]
 ;W[sg]
 ;B[pf]
 ;W[sf]
 ;B[og])
 (;W[qj]
 ;B[qg]
 ;W[kc]
 ;B[ql])))
 (;B[qd]
 ;W[od]
 ;B[pc]
 ;W[oe]
 ;B[nb]
 ;W[mc]LB[oi:7][qj:A]C[Black 7 would be better on 'a' now.]))
 (;B[re]
 ;W[qi]
 ;B[qj]
 ;W[ri]LB[rf:B][rj:A]C['a' is correct, 'b' is disadvantageous.
+]
 (;B[rj]
 ;W[rh]
 ;B[rf]
 ;W[rg]
 ;B[oi])
 (;B[rf]
 ;W[rg]
 ;B[rj]
 ;W[oi]
 ;B[pj]
 ;W[ne]
 ;B[oc]
 ;W[pe]
 ;B[qe]
 ;W[od]
 ;B[pc]
 ;W[md]
 ;B[of]
 ;W[nf])))
 (;W[oh]LB[qg:A][qi:B]C['a' or 'b'.
 Modern Korean joseki]
 (;B[qg]
 ;W[pf]LB[nc:d][md:b][nd:a][rd:c]C[Black continues with 'a' to 'c'.
 'd' is possible too.
 Black 'c' and 'd' are territory oriented.]
 (;B[nd]
 (;W[oe]LB[qc:b][od:a]C[White 10 protects against the cut.
 It is also possible to skip this exchange.
 Black continues with 'a' or 'b'.]
 (;B[od]LB[rf:A][pk:B]
 (;W[rf]LB[qc:b][qi:a]C[White later aims at the cut of 'a' or invasion of 'b'.]
 ;B[rd]
 ;W[qi]
 ;B[qj]
 ;W[ri]
 ;B[pj]
 ;W[rh]LB[od:B][oe:A]C['a'-'b' exchange becomes bad for White])
 (;W[pk]
 ;B[oi]
 ;W[ni]
 ;B[oj]))
 (;B[qc]C[Black 11 protects against later invasion.]
 ;W[pk]
 ;B[oi]
 ;W[ni]
 ;B[oj]C[Black 13 is a tesuji for getting access to the center.]
 ;W[mh]))
 (;W[rf]
 ;B[qk]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[pc]
 ;W[qb]C[* Joseki *]))
 (;B[md]
 ;W[rf]
 ;B[qk]
 ;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qb]
 ;W[rb]
 ;B[qn])
 (;B[rd]
 ;W[rf]
 ;B[qj]
 ;W[od]
 ;B[pc]
 (;W[oe]
 ;B[nb]C[Joseki])
 (;W[ne]C[New Korean move]
 ;B[of]C[Good timing!]
 ;W[oe]
 ;B[nb]C[Later Black may use the aji of his stone.]))
 (;B[nc]
 ;W[qd]
 ;B[qc]
 ;W[od]
 ;B[oc]
 ;W[pe]
 ;B[pc]
 ;W[pk]C[White makes good shape for himself and weakens the Black stones on the right very much.]))
 (;B[qi]
 ;W[oe]LB[nc:A][od:B]TR[jd]C['a' or, with an additional stone on the triangled position, 'b'.]
 (;B[nc]
 ;W[qm]LB[pp:A]C[The stone has support on or near 'a'.]
 ;B[oi]
 ;W[nh]
 ;B[mj]
 ;W[lh]C[Result: fight.])
 (;AB[jd]
 ;B[od]
 ;W[ne]
 ;B[mc]
 ;W[oi]))))
 (;B[qi]LB[nd:b][of:a]C[Black plays 5 with support down the right side.
 White continues with 'a' or 'b'.]
 (;W[of]C[This variation is from Cho Chikun vs. Yoda Norimoto, 1999 Meijin title game 1.]
 ;B[nd]
 ;W[pi]
 ;B[pj]LB[qg:A][qj:B]C['a' is correct, 'b' is complicated.]
 (;W[qg]
 ;B[qk]
 ;W[rd]
 ;B[qc])
 (;W[qj]
 ;B[rj]C[For Black 11 to make sense, Black must have support such as shown.]
 ;W[qk]
 ;B[rk]
 ;W[ql]
 ;B[oj]
 ;W[ni]
 ;B[rl]
 ;W[nj]
 ;B[pl]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[kc]))
 (;W[nd]C[White 6 looks a bit inconsistent, a seeming change of direction toward the top from the emphasis on the right of White 4.
 This variation is from Wang Lei vs. Zhou Heyang, 1996 All Chinese Championship.]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qg]
 ;B[qe]
 ;W[pi]
 ;B[qj]
 ;W[pj]
 ;B[qk]
 ;W[mi]
 ;B[me]
 ;W[kc]
 ;B[ke]
 ;W[ki]
 ;B[mc]
 ;W[hc])))
 (;W[of]LB[nc:B][nd:A][qe:D][pg:E][qk:C]C[
 'a' and 'b' are joseki. 'c' is mistake
 D is rare joseki
 'e' is not recommended.]
 (;B[nd]LB[qc:B][nd:5][oh:C][pi:A][qj:E][pk:D]C['a' is the usual joseki.
 To avoid complications, Guo Juan 5P will just play 'b'.
 'c' is questionable.
 'd' is not recommended.
 'e' is a mistake.
+]
 (;W[pi]CR[qp]LB[nd:5][qe:C][ph:A][qi:B][qj:D]TR[nc]C[The sequence from White 6 on is similar, but not the same as with the one-space pincer in conjunction with the 3-4 stone.
 'a' is joseki if there's a White stone on the squared point, hoshi in the lower right corner, or no White stone in that corner. In this case, 'b' is not recommended.
 But, if there's a White stone on the circled point, komoku in the lower right corner, 'a' is disadvantageous, and 'b' is the correct choice.
 'c' and 'd' are inferior.
 If Black 5 would be on the triangled stone, 'a' would be wrong and 'c' correct.
 ]MA[pp]
 (;B[ph]
 ;W[oh]LB[oi:B][qi:A]C['a' is the usual joseki, 'b' punishes if Black has the ladder.
+]
 (;B[qi]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[ql]LB[of:4][og:C][pl:B][om:A]TR[qp]C['a' is usual and necessary.
 If the choice of the variation is correct whole-board-strategy and White wants to create a big wall, he must play 'b'. Connecting on 'c' is too slow and unnecessary.]
 (;W[om]LB[og:B][qm:A][qn:D][dp:C]C['a' is a usual answer to the White stone.
 The cut on 'b' is possible.
 After the tenuki 'c' White attacks the top right corner.
 'd' is a mistake.]
 (;B[qm]LB[og:A][pg:B][nh:A]C[Cutting at 'a' or 'b' doesn't do harm.]
 (;B[nh]C[Later, Black can undo White's influence.]
 ;W[og]
 ;B[ni]
 ;W[oi]
 ;B[nl]
 ;W[ol])
 (;B[og]
 ;W[ng]
 ;B[pg]
 ;W[nh]
 ;B[pf]
 ;W[qc]LB[pc:B][qd:A]C['a' or 'b' don't kill.]
 (;B[qd]
 ;W[pb]
 ;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]LB[qa:B][me:A]C['a' threatens the corner, 'b' tries to kill, but just pushes White out.]
 (;B[me]LB[qa:B][ob:A]C[White lives on 'a' or Black kills on 'b'.]
 (;W[ob])
 (;B[qa]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[nc]
 ;B[mc]
 ;W[oc]
 ;B[mb]
 ;W[od]
 ;B[oe]))
 (;B[qa]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[nc]
 ;B[mc]
 ;W[oc]
 ;B[lb]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[nf]
 ;W[md]))
 (;B[pc]
 ;W[rb]
 ;B[rd]
 ;W[qd]
 ;B[re]
 ;W[pb]
 ;B[ob]
 ;W[qe]
 ;B[rf]
 ;W[pe]
 ;B[oe]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[oa]))
 (;B[pg]
 ;W[og]
 ;B[pf]
 ;W[qc]LB[pc:B][qd:A]
 (;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[ob])
 (;B[pc]
 ;W[rb])))
 (;B[og]
 ;W[ng]
 ;B[pg]LB[qc:A]C[White can live on 'a'.])
 (;B[dp]LB[oc:A][og:B][qm:C]C[White starts to do something on the top site with 'a' or threatens the right group on 'b' or strengthens his wall on 'c' depending on the fuseki.]
 (;W[oc]
 ;B[od]LB[mf:B][og:A]C['a' aims for territory, 'b' for sente.]
 (;W[og]
 ;B[qn]
 ;W[lc]LB[nc:B][me:A]C['a' is correct. 'b' is a mistake.]
 (;B[me]LB[nc:B][jd:A]C[Either 'a' and 'b' are good.]
 (;W[jd]
 ;B[nc]
 ;W[fc])
 (;W[nc]
 ;B[pc]
 ;W[ic]))
 (;B[nc]
 ;W[le]
 ;B[rd]
 ;W[fc]C[As Black had to secure the corner in gote, White can play an extension on the top. White is better off.]))
 (;W[mf]LB[ld:A][qn:B]C['a' is correct. 'b' is a mistake.]
 (;B[ld]
 ;W[qn]
 ;B[rm])
 (;B[qn]
 ;W[ld]
 ;B[nc]
 ;W[lb]
 ;B[ng]
 ;W[nf]
 ;B[qe])))
 (;W[og]LB[dd:B][qn:A]C['a' is correct. Tenuki 'b' again is wrong.]
 (;B[qn]
 ;W[lc]
 ;B[me]
 ;W[jd]
 ;B[ld]LB[mc:A][kd:B]C['a' and 'b' are correct.]
 (;W[mc]
 ;B[nc]
 ;W[kd]
 ;B[qd]
 ;W[fc])
 (;W[kd]
 ;B[mc]
 ;W[le]
 ;B[lf]
 ;W[md]LB[ne:A][mf:B]C['a' is correct. 'b' is a mistake.]
 (;B[ne]
 ;W[mb]
 ;B[ld]
 ;W[qk]
 ;B[rk]
 ;W[md]
 ;B[nc]
 ;W[kb]
 ;B[mg]
 ;W[mi])
 (;B[mf]
 ;W[nc]
 ;B[ld]
 ;W[qk]
 ;B[rk]
 ;W[md]
 ;B[mb])))
 (;B[dd]
 ;W[qn]
 ;B[rm]
 ;W[rn]
 ;B[qk]
 ;W[rf]
 ;B[rg]LB[qc:A]C[Good for White, who can still invade on 'a'.]))
 (;W[qm]
 ;B[pl]
 ;W[ol]
 ;B[qk]
 ;W[ni]
 ;B[pm]
 ;W[pn]
 ;B[rn]))
 (;B[qn]
 ;W[pl]
 ;B[qm]LB[nh:A]C[Black can no longer undo White's influence starting on A, because White removed a threat to cut in sente.]))
 (;AW[qp]LB[pl:A][om:B]C['a' or 'b' are ok.]
 (;W[pl]
 ;B[qm]
 ;W[pm]
 ;B[qn]
 ;W[pn]LB[og:A]C[White weakness on 'a'.
+]
 ;B[rp]
 ;W[rq]
 ;B[ro]
 ;W[pq])
 (;W[om]
 ;B[qm]
 ;W[op]
 ;B[jq]))
 (;W[og]C[Slow for White.]))
 (;B[oi]
 ;W[qi]LB[og:A][ri:B]C['a' or 'b'.]
 (;B[og]
 ;W[nh]
 ;B[pg]
 ;W[ng]
 ;B[pf]
 ;W[rh]
 ;B[nf]
 ;W[oj]
 ;B[oe]
 ;W[rg])
 (;B[ri]
 ;W[rh]
 ;B[rg]
 ;W[qg]
 ;B[sh]
 ;W[pg]
 ;B[rh]
 ;W[qk]
 ;B[rj]
 ;W[ok])))
 (;AW[qp]
 ;B[qi]
 ;W[pj]LB[ph:B][qj:A]C['a' is correct. 'b' is a mistake.
+]
 (;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[pl]
 ;B[qm]
 ;W[pm]
 ;B[qn]
 ;W[pn]
 ;B[qo]
 ;W[po]
 ;B[pp]LB[ph:A]C[This is possible only because Black hasn't pushed on 'a'.
+]
 ;W[qq]
 ;B[pq]
 ;W[pr]
 ;B[or]
 ;W[qr]
 ;B[np]
 ;W[ro]
 ;B[rn]
 ;W[rp]
 ;W[qk]C[Later, White can spoil Black's shape.
+]
 ;B[rk]
 ;W[rg]
 ;B[rh]
 ;W[sm]
 ;B[rl]
 ;W[sn]
 ;B[og]C[... but Black can still get out.
+]
 ;W[pg]C[White can't cut and kill.
+]
 ;B[ph]
 ;W[oh]
 ;B[qg])
 (;B[ph]
 ;W[oh]
 ;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[pl]
 ;B[qm]
 ;W[pm]
 ;B[qn]
 ;W[pn]LB[qo:B][rp:A]C[Black must play 'a' and cannout cut on 'b'.
+]
 (;B[rp]
 ;W[rq]
 ;B[ro]
 ;W[pq])
 (;B[qo]
 ;W[po]
 ;B[pp]
 ;W[qq]
 ;B[pq]
 ;W[pr]
 ;B[or]
 ;W[qr]
 ;B[np]
 ;W[ro]
 ;B[rn]
 ;W[rp]LB[ph:9][qk:A]C[Black lives or White kills on 'a'. Black 9 has damaged the escape route.
+]
 (;B[qk])
 (;W[qk]
 ;B[rk]
 ;W[rg]LB[rh:B][sl:A]C['a' or 'b', White kills.
+]
 (;B[sl]
 ;W[sj])
 (;B[rh]
 ;W[sm]LB[rl:A][sn:B]C['a' or 'b'.
+]
 (;B[rl]
 ;W[sn])
 (;B[sn]
 ;W[rl]))))))
 (;B[qe]LB[re:C][rf:B][qi:A]C['a' is correct. 'b' and 'c' are wrong.]
 (;W[qi]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[rh]LB[lc:D][oc:A][qc:B][rd:C]C[Good for White because the Black corner is still open.
 Later, White 'a' is correct.
 'b' and 'c' are not recommended.
 White 'd' is a mistake.]
 (;W[oc]LB[nc:C][pc:B][od:A]C['a', 'b' or 'c' don't save everything.]
 (;B[od]
 ;W[pc]LB[nc:A][qc:B]C['a' or 'b' don't kill.]
 (;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rb])
 (;B[qc]
 ;W[qb]
 ;B[rc]
 ;W[mb]))
 (;B[pc]LB[pe:B][re:A]C['a' is correct. 'b' is a mistake.]
 (;W[re]LB[od:A][rd:B]C['a' loses less than 'b'.]
 (;B[od]
 ;W[rd])
 (;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[od]))
 (;W[pe]
 ;B[oe]))
 (;B[nc]
 ;W[re]LB[od:A][rd:B]C['a' loses less than 'b'.]
 (;B[od]
 ;W[rd])
 (;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[od])))
 (;W[qc]LB[ob:C][pb:B][pc:A][rd:D]C['a', 'b' or 'c' are possible.
 'd' is a mistake.]
 (;B[pc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[pb]
 ;W[qd]LB[sc:B][pe:A]C[Neither 'a' nor 'b' kill.]
 (;B[pe]
 ;W[sc])
 (;B[sc]
 ;W[pe]
 ;B[sd]
 ;W[sb]))
 (;B[pb]
 ;W[oc]LB[pc:B][od:A]C['a' is better than 'b'.]
 (;B[od]
 ;W[pc]LB[nc:A][rd:B]C['a' is better than 'b'.]
 (;B[nc]
 ;W[rd]
 ;B[re]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[lc]
 ;W[rb])
 (;B[rd]
 ;W[nc]
 ;B[md]
 ;W[mc]
 ;B[ld]
 ;W[kc]))
 (;B[pc]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[pe]
 ;W[md]
 ;B[nc]
 ;W[mc]
 ;B[nf]
 ;W[nb]LB[pf:B][og:A]C['a' is correct. 'b' is a mistake.]
 (;B[og]
 ;W[ph]
 ;B[pf])
 (;B[pf]LB[og:A][ph:B]C['a' is correct. 'b' is a mistake.]
 (;W[og]
 ;B[pg]
 ;W[oh])
 (;W[ph]
 ;B[og]))))
 (;B[ob]
 ;W[pb]
 ;B[rb]
 ;W[oc]LB[pc:A][od:B]C['a' keeps the corner, 'b' emphasizes the top side.]
 (;B[pc]
 ;W[nb]
 ;B[qb]
 ;W[oa]
 ;B[od]
 ;W[lc])
 (;B[od]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[mc]
 ;W[rc]
 ;B[pc]
 ;W[qb]
 ;B[nc]
 ;W[ob]
 ;B[rd]
 ;W[sb]
 ;B[ra]
 ;W[qa]))
 (;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nb]))
 (;W[rd]LB[rc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;B[rc]LB[qc:B][re:A]C['a' or 'b'.]
 (;W[re]
 ;B[qd]
 ;W[sg]
 ;B[sd]
 ;W[sf])
 (;W[qc]
 ;B[rb]LB[qd:B][re:A]C['a' is correct. 'b' fails.]
 (;W[re]
 ;B[qd]
 ;W[sg])
 (;W[qd]
 ;B[re]
 ;W[qb]
 ;B[pc]
 ;W[pe]
 ;B[pb])))
 (;B[re]LB[oc:A][qc:B]C['a' or 'b' are ok.]
 (;W[oc]
 ;B[od]LB[pc:B][qc:A]
 (;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[ob]LB[rb:A][qd:B]
 (;W[rb]
 ;B[pa]LB[qb:B][sc:A]
 (;W[sc]
 ;B[qb]
 ;W[qd]
 ;B[ra]LB[sb:B][pe:A]
 (;W[pe]
 ;B[se]
 ;W[sd]
 ;B[sb]
 ;W[sa])
 (;W[sb]
 ;B[se]
 ;W[sd]
 ;B[qa]
 ;W[pe]
 ;B[sa]
 ;W[sg]
 ;B[rc]))
 (;W[qb]
 ;B[qa]
 ;W[sc]
 ;B[ra]))
 (;W[qd]LB[qb:A][pe:B]
 (;B[qb]
 ;W[rb]
 ;B[pa]
 ;W[pe]LB[ra:B][sd:A]
 (;B[sd]
 ;W[rc]
 ;B[sc]
 ;W[sb]
 ;B[se]
 ;W[sg]
 ;B[ra]
 ;W[sf])
 (;B[ra]
 ;W[se]
 ;B[sb]
 ;W[sg]
 ;B[rc]
 ;W[sf]))
 (;B[pe]
 ;W[rb]
 ;B[sc]
 ;W[sd]
 ;B[pa]
 ;W[qa]
 ;B[qb])))
 (;W[pc]LB[nc:B][qc:A]
 (;B[qc]
 ;W[qb]LB[rb:A][rc:B]
 (;B[rb]
 ;W[rc]
 ;B[qd]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[pb]
 ;W[sa]
 ;B[ob]
 ;W[sd])
 (;B[rc]
 ;W[mc]))
 (;B[nc]LB[qb:A][qc:B]
 (;W[qb]
 ;B[rc]
 ;W[rb]LB[ob:B][qd:A]
 (;B[qd]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[sb]
 ;W[pa])
 (;B[ob]
 ;W[qc]
 ;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[pb]
 ;B[pa]
 ;W[nb]))
 (;W[qc]
 ;B[rb]
 ;W[qd]
 ;B[pe]
 ;W[qb]
 ;B[ob]
 ;W[ra]
 ;B[sb])))
 (;W[pc]
 ;B[qc]
 ;W[qb]))
 (;W[qc]LB[ob:C][pb:B][pc:A]C['a', 'b' or 'c'.]
 (;B[pc]
 ;W[rb]
 ;B[pb]
 ;W[qd]LB[sc:B][pe:A]C['a' or 'b' don't kill.]
 (;B[pe]
 ;W[sc])
 (;B[sc]
 ;W[pe]
 ;B[sd]
 ;W[sb]))
 (;B[pb]
 ;W[oc]LB[pc:A][od:B]C['a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[pe]
 ;W[md]
 ;B[nf]
 ;W[nc]LB[og:B][ph:A]
 (;B[ph]
 ;W[oh]LB[og:B][pg:A]
 (;B[pg]
 ;W[og]
 ;B[pf])
 (;B[og]
 ;W[pg]
 ;B[pf]))
 (;B[og]
 ;W[ph]
 ;B[pf]))
 (;B[od]
 ;W[pc]
 ;B[nc]
 ;W[ob]
 ;B[rb]
 ;W[qb]LB[rc:B][qd:A]C['a' is less bad than 'b'.]
 (;B[qd]
 ;W[rc])
 (;B[rc]
 ;W[qd]
 ;B[sd]
 ;W[pe]
 ;B[nb]
 ;W[se]
 ;B[sf]
 ;W[sh]LB[oa:B][sc:A]C['a' or 'b' don't help.]
 (;B[sc]
 ;W[sg]
 ;B[se]
 ;W[ra])
 (;B[oa]
 ;W[pa]
 ;B[na]
 ;W[sg]
 ;B[se]
 ;W[sc]))))
 (;B[ob]
 ;W[pb]LB[rb:A][pc:B]C['a' is better than 'b'.]
 (;B[rb]
 ;W[oc]
 ;B[pc]
 ;W[nb]
 ;B[qb]
 ;W[oa]
 ;B[od]
 ;W[lc])
 (;B[pc]
 ;W[rb]
 ;B[pa]
 ;W[qb]
 ;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[ra]
 ;B[sb]
 ;W[oa]
 ;B[pa]
 ;W[oc]
 ;B[nb]
 ;W[pe]LB[od:A][qd:B]C['a' or 'b' don't kill.]
 (;B[qd]
 ;W[od]
 ;B[se]
 ;W[rc]
 ;B[na]
 ;W[sg])
 (;B[od]
 ;W[qd]))))))
 (;W[lc]
 ;B[me]LB[oc:A][qc:B]
 (;W[oc]
 ;B[nc]LB[qc:B][rd:A]
 (;W[rd]
 ;B[rc])
 (;W[qc]
 ;B[rd]
 ;W[pc]
 ;B[nb]))
 (;W[qc]
 ;B[rd]
 ;W[oc]
 ;B[nc])))
 (;W[rf]
 ;B[ph]
 ;W[oh]
 ;B[qi]LB[oi:B][pj:A]C['a' is usual. 'b' was played by Kitani Minoru.]
 (;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[ql]LB[rf:8][og:A][om:B]C[White wants to connect on 'a' and push down on 'b' at once, so White 8 was a mistake.]
 (;W[og]
 ;B[pl]
 ;W[ol]
 ;B[pn])
 (;W[om]
 ;B[og]
 ;W[ng]
 ;B[pg]
 ;W[pf]
 ;B[nf]
 ;W[ne]
 ;B[mf]
 ;W[od]
 ;B[oc]
 ;W[oe]
 ;B[md]
 ;W[qk]
 ;B[rk]
 ;W[rj]
 ;B[ri]
 ;W[rl]
 ;B[sj]
 ;W[qm]
 ;B[rg]
 ;W[qd]
 ;B[qc]
 ;W[rd]
 ;B[rc]))
 (;W[oi]
 ;B[pj]
 ;W[mf]LB[ld:B][me:A]C['a' is correct. 'b' is a mistake.]
 (;B[me]LB[oc:A][lf:B]C['a' is correct. 'b' is a mistake.]
 (;W[oc]
 ;B[od]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[qb]LB[nc:B][re:A]C['a' is correct, 'b' is questionable.]
 (;B[re]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[lf]
 ;W[pg]
 ;B[oj]
 ;W[lg]LB[mg:A][mj:B]C['a' or 'b' are possible.]
 (;B[mg]
 ;W[mh]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[mj])
 (;B[mj]
 ;W[mh]
 ;B[kf]
 ;W[kg]))
 (;B[nc]
 ;W[re]))
 (;W[lf]
 ;B[ng]
 ;W[nf]
 ;B[pg]))
 (;B[ld]
 ;W[pl])))
 (;W[re]
 ;B[rd]
 ;W[pe]
 ;B[qd]
 ;W[qi]
 ;B[rg]
 ;W[rf]
 ;B[ri]
 ;W[rj]
 ;B[ph]
 ;W[oh]
 ;B[qj]
 ;W[si]
 ;B[rh]
 ;W[rk]
 ;B[oi]
 ;W[pj]
 ;B[oj]
 ;W[pk]
 ;B[og]
 ;W[nh]
 ;B[pg]
 ;W[ng]
 ;B[pf]
 ;W[oe]
 ;B[sf]
 ;W[nk]
 ;B[nf]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[od]
 ;W[nf]
 ;B[le]))
 (;B[qj]
 ;W[qi]
 ;B[ri]
 ;W[ph]
 ;B[rh]
 ;W[pj]
 ;B[qk]
 ;W[pk]
 ;B[ql]
 ;W[om]
 ;B[pg]C[This is bad.]
 ;W[og]
 ;B[pf]
 ;W[pe]
 ;B[qg]
 ;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[rf]
 ;W[re]
 ;B[qf]
 ;W[od]
 ;B[pc]
 ;W[oc]
 ;B[pb]
 ;W[ob]
 ;B[qc]
 ;W[gd]))
 (;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[ob])
 (;W[oh]
 ;B[qe]
 ;W[rf]
 ;B[qj]
 ;W[mf]C[White got not much.])
 (;W[pk]
 ;B[oh]
 ;W[mf]
 ;B[rd])
 (;W[qj]LB[pg:B][oh:A]C['a' is easy, 'b' is also possible, but complicated.]
 (;B[oh]
 ;W[rh]C[White can't connect...]
 ;B[pg]LB[pf:A][qg:B]C[... because of this sente move.
 'a' or 'b' don't give a good result.]
 (;W[pf]
 ;B[ri])
 (;W[qg]
 ;B[pf]
 ;W[qe]
 ;B[pe]))
 (;B[pg]
 ;W[pf]
 ;B[ng]
 ;W[rh]
 ;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[og]
 ;B[oh]
 ;W[pi]LB[rf:A][sh:B]C['a' is correct. 'b' is a mistake.]
 (;B[rf]
 ;W[nh]
 ;B[oi]
 ;W[mh]
 ;B[oj]
 ;W[mf]
 ;B[qk]
 ;W[rj]
 ;B[sh]
 ;W[rk]
 ;B[ql]
 ;W[rl]
 ;B[qm]
 ;W[rm]
 ;B[qn])
 (;B[sh]
 ;W[rf]
 ;B[rj]
 ;W[qk]
 ;B[nf]
 ;W[rk]
 ;B[sj]
 ;W[sf]
 ;B[sg]
 ;W[qc]))))
 (;B[nc]
 ;W[pi]LB[nc:5][qe:A][ph:B]TR[nd]C['a' is joseki. 'b' is a mistake.
 If Black 5 would be on the triangled point instead, 'a' would be wrong and 'b' correct.]
 (;B[qe]LB[rf:B][qi:A]C['a' is joseki, 'b' depends on a ladder.]
 (;W[qi]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[rh]LB[rd:B][ph:A]C[
 * Joseki *
 Later, White plays 'a' threatening to capture two stones on 'b'. Playing 'b' immediately is too early.]
 (;W[ph]C[Black can tenuki ...]
 ;W[rd]LB[rc:A][re:B]C[... and White captures two stones. 'a' is correct. 'b' is a mistake.]
 (;B[rc]LB[qc:B][re:A]C['a' or 'b' are ok.]
 (;W[re]
 ;B[qd]
 ;W[sg]
 ;B[sd]
 ;W[sf])
 (;W[qc]
 ;B[rb]LB[qd:B][re:A]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[qd]
 ;W[sf]
 ;B[sd]
 ;W[sg])
 (;W[qd]
 ;B[re]
 ;W[pe]
 ;B[pc]
 ;W[qb]
 ;B[sd])))
 (;B[re]
 ;W[qc]LB[ob:A][pb:B]C['a' or 'b' don't kill.]
 (;B[ob]
 ;W[pc]
 ;B[oc]
 ;W[rb]
 ;B[sc]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[lc]
 ;W[sd]
 ;B[qa]
 ;W[ld]
 ;B[kc]LB[mf:A][nf:B]C['a' is correct. 'b' is a mistake.]
 (;W[mf]
 ;B[me]
 ;W[ra]
 ;B[sb]
 ;W[le]
 ;B[nf]
 ;W[ng]
 ;B[pe]
 ;W[lg]
 ;B[pb]
 ;W[pf]
 ;B[qb]
 ;W[sg]
 ;B[qd]
 ;W[rc]
 ;B[se]
 ;W[sf])
 (;W[nf]
 ;B[me]
 ;W[lf]
 ;B[le]
 ;W[ke]
 ;B[kd]))
 (;B[pb]
 ;W[pc]
 ;B[oc]
 ;W[rb]
 ;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[mf]
 ;B[nf]
 ;W[ng]
 ;B[me]
 ;W[le]
 ;B[pe]
 ;W[lg]
 ;B[ra]
 ;W[sb]
 ;B[qb]
 ;W[sg]
 ;B[qd]
 ;W[rc]
 ;B[ob]
 ;W[sf]
 ;B[sa]
 ;W[pf])))
 (;W[rd]C[Later, this doesn't work.]
 ;B[re]
 ;W[qc]LB[ob:A][pb:B][pc:C]C['a' or 'b' kill, 'c' fails.]
 (;B[ob]
 ;W[pc]LB[oc:A][od:B]C['a' kills, 'b' fails.]
 (;B[oc]
 ;W[rb]
 ;B[qa]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc]LB[mf:B][nf:A]C['a' or 'b' don't save the corner.]
 (;W[nf]
 ;B[me]LB[kd:B][lf:A]C['a' or 'b' don't save the corner.]
 (;W[lf]
 ;B[le]
 ;W[ke]
 ;B[kd])
 (;W[kd]
 ;B[mf]
 ;W[mc]
 ;B[mb]
 ;W[jc]
 ;B[jb]))
 (;W[mf]
 ;B[nf]
 ;W[ng]
 ;B[og]
 ;W[pf]
 ;B[mg]
 ;W[nh]
 ;B[me]
 ;W[lf]
 ;B[le]
 ;W[ke]
 ;B[pe]LB[kd:A][ph:B]C['a' or 'b' don't save the corner.]
 (;W[kd]
 ;B[pg])
 (;W[ph]
 ;B[kd])))
 (;B[od]
 ;W[oc]LB[nb:B][nd:A]C['a' or 'b' don't kill.]
 (;B[nd]
 ;W[pb]
 ;B[nb]
 ;W[rb])
 (;B[nb]
 ;W[nd]
 ;B[qd]
 ;W[rc]
 ;B[ra]
 ;W[oe]
 ;B[rb]
 ;W[pe]
 ;B[qb]
 ;W[sg]
 ;B[pb]
 ;W[se]
 ;B[sc]
 ;W[sf])))
 (;B[pb]
 ;W[pc]
 ;B[oc]
 ;W[rb]
 ;B[sc]
 ;W[sd]LB[qa:A][oe:B]C['a' kills, 'b' fails.]
 (;B[qa]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc]LB[mf:A][nf:B]C['a' or 'b' don't save the corner.]
 (;W[mf]
 ;B[nf]
 ;W[ng]
 ;B[og]LB[pf:A][oh:B]C['a' or 'b' don't save the corner.]
 (;W[pf]
 ;B[pe]
 ;W[ph]
 ;B[me]
 ;W[le]
 ;B[lf]
 ;W[mg]
 ;B[kf]
 ;W[ke]
 ;B[je]
 ;W[jf]
 ;B[kd])
 (;W[oh]
 ;B[pf]
 ;W[ph]
 ;B[me]
 ;W[le]
 ;B[lf]))
 (;W[nf]
 ;B[me]
 ;W[lf]
 ;B[le]
 ;W[ke]
 ;B[kd]))
 (;B[oe]
 ;W[qa]LB[ob:A][sb:B]C['a' or 'b' don't kill.]
 (;B[ob]
 ;W[qb]
 ;B[sb]
 ;W[sa]
 ;B[ra]
 ;W[rc])
 (;B[sb]
 ;W[qb]
 ;B[sa]
 ;W[ob]
 ;B[oa]
 ;W[nb]
 ;B[mb]
 ;W[pa])))
 (;B[pc]
 ;W[rb]
 ;B[pb]LB[sc:B][qd:A]C['a' is correct and gives life. 'b' is wrong and makes only a ko.]
 (;W[qd]LB[sc:B][pe:A]C['a' or 'b' don't kill.]
 (;B[pe]
 ;W[sc])
 (;B[sc]
 ;W[pe]
 ;B[sh]
 ;W[ri]LB[qb:B][sd:A]C['a' or 'b' don't help.]
 (;B[sd]
 ;W[sb]LB[qb:A][se:B]C['a' or 'b' don't help.]
 (;B[qb]
 ;W[rc]
 ;B[se]
 ;W[sg]
 ;B[sf]
 ;W[sg])
 (;B[se]
 ;W[sg]
 ;B[sf]
 ;W[rc]
 ;B[sg]
 ;W[si]))
 (;B[qb]
 ;W[sd]LB[sb:B][se:A]C['a' or 'b' don't help.]
 (;B[se]
 ;W[rc]
 ;B[ra]
 ;W[sb]
 ;B[qa]
 ;W[sg]
 ;B[sf]
 ;W[sg])
 (;B[sb]
 ;W[se]
 ;B[ra]
 ;W[sg]
 ;B[rc]
 ;W[sf]))))
 (;W[sc]
 ;B[qb]
 ;W[qd]
 ;B[ra]
 ;W[pe]
 ;B[sb]
 ;W[sa]))))
 (;W[rf]LB[ph:A][fq:B]C[Black can play 'a' with the ladder or a ladder breaker like 'b'.]
 (;B[ph]
 ;W[oh]
 ;B[oi]LB[qi:B][oj:A]C['a' starts the ladder. White cannot get a good result without the ladder on 'b'.]
 (;W[oj]
 ;B[ni]
 ;W[nh]
 ;B[pj]
 ;W[qi]
 ;B[qj]
 ;W[ri]
 ;B[rh]
 ;W[rj]
 ;B[rk]
 ;W[qk]
 ;B[pk]
 ;W[mi]
 ;B[nj]
 ;W[ok]
 ;B[pl]
 ;W[nk])
 (;W[qi]LB[og:A][ri:B]C['a' is correct. 'b' is a mistake.]
 (;B[og]
 ;W[nh]
 ;B[pf]
 ;W[ng]
 ;B[pg]
 ;W[rh]
 ;B[oj]C[Good for Black.])
 (;B[ri]
 ;W[rh]LB[og:B][rg:A]C[Neither 'a' nor 'b' help Black.]
 (;B[rg]
 ;W[qg]
 ;B[sh]
 ;W[pg]
 ;B[rh]
 ;W[qk]C[White is successful.])
 (;B[og]
 ;W[nh]
 ;B[pf]
 ;W[ng]
 ;B[pg]
 ;W[qg]
 ;B[pe]
 ;W[rj]C[Good for white.]))))
 (;AW[dp]
 ;B[fq]LB[qh:3][qi:B][dn:A]C[White can answer the ladder breaker with 'a' which is recommended or capture Black 3 on 'b' what is wrong.]
 (;W[dn]
 ;B[ph]
 ;W[qi]
 ;B[oi]
 ;W[oj]
 ;B[oh]
 ;W[rh]
 ;B[nj]
 ;W[ok]
 ;B[nk]
 ;W[ol]
 ;B[nl]
 ;W[om]C[Equal result.])
 (;W[qi]
 ;B[cn]C[Black is better.]))))
 (;B[ph]
 ;W[oh]
 ;B[qi]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[om]LB[md:A]C[Later White can press on 'a'.]
 ;W[md]
 ;B[mc]
 ;W[ld]C[White's influence is better than the Black territory.]))
 (;B[qk]
 ;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[oc]
 ;W[md]
 ;B[rd]
 ;W[re]
 ;B[qc]C[White is better.])
 (;B[qe]
 (;W[rf]C[Heavy for White.]
 ;B[oh]LB[od:B][pe:A]
 (;W[pe]
 ;B[od]
 ;W[qd]
 ;B[qc]LB[rd:B][re:A]
 (;W[re]
 ;B[rc])
 (;W[rd]
 ;B[oe]
 ;W[pf]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[og]
 ;B[qk]))
 (;W[od]
 ;B[pf]
 ;W[pg]
 ;B[pe]
 ;W[oe]
 ;B[og]
 ;W[pc]
 ;B[re]
 ;W[qc]
 ;B[ph]))
 (;W[re]
 ;B[rd]
 ;W[od]
 ;B[oc]
 ;W[nd]C[White is slightly better off.])
 (;W[qg]
 ;B[ph]
 ;W[nd]
 ;B[ne]
 ;W[oe]
 ;B[od]
 ;W[me]
 ;B[nc]
 ;W[nf]
 ;B[mc]
 ;W[pk]C[Michael Redmond vs Alexander Dinerchtein. The position is equal.]))
 (;B[pg]
 ;W[pf]
 ;B[nd]LB[pi:B][pk:A]C['a' is correct, 'b' is inferior.]
 (;W[pk])
 (;W[pi]
 ;B[qi]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[om]
 ;B[qm]
 ;B[ph]
 ;W[oh]
 ;B[og]
 ;W[ng]
 ;B[nf]
 ;W[nh]
 ;B[mf])))
 (;W[dp]LB[nc:B][pf:A]C['a' or 'b'.]
 (;B[pf]
 ;W[pe]LB[oe:B][qe:A]C['a' takes a lot of territory on the right, 'b' builds a wall to the top.]
 (;B[qe]
 ;W[oe]
 ;B[of]
 ;W[qd]
 ;B[re]
 ;W[ne]
 ;B[qc]
 ;W[nf]
 ;B[ng]
 ;W[mg]
 ;B[nh]
 ;W[mh]
 ;B[ni]
 ;W[mi]
 ;B[nj])
 (;B[oe]
 ;W[qe]
 ;B[pg]
 ;W[qd]
 ;B[pc]
 ;W[qc]LB[pb:B][qb:A]C['a' is correct, 'b' is questionable.]
 (;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[rg]
 ;B[jd]LB[ne:A]C[Later, White wants to play 'a'.])
 (;B[pb]
 ;W[qb]
 ;B[nf]
 ;W[jd])))
 (;B[nc]LB[qc:C][qd:A][of:B]C['a' makes a group, 'b' influence. 'c' is unfavorable, makes a group too tightly enclosed.]
 (;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[qe]
 ;W[rd]LB[pe:A][re:B]C['a' is correct. 'b' is only possible if there is an additional stone on the right side.]
 (;B[pe]LB[pc:A][re:B]C['a' makes a safe enclosed corner group. 'b' makes a group running out.]
 (;W[pc]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[sb]
 ;B[re]
 ;W[ra]
 ;B[pl])
 (;W[re]
 ;B[qb]
 ;W[pf]
 ;B[rg]
 ;W[rf]
 ;B[qk]
 ;W[nf]
 ;B[qn]))
 (;B[re]
 ;W[pe]
 ;B[rf]
 ;W[pc]
 ;B[od]
 ;W[pb]
 ;B[og]))
 (;W[of]
 ;B[qd]
 ;W[pi]
 ;B[qi]
 ;W[pj]
 ;B[ph]
 ;W[oh]
 ;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[om]
 ;B[qn]
 ;W[og]LB[of:6]C[If Black can eliminate White's influence with his next move, White 6 was a wrong choice.])
 (;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[me])))
 (;W[qd]
 ;B[qc]
 (;W[rc]LB[pc:B][qe:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[qe]
 ;W[rd]
 ;B[pe]
 ;W[pc]LB[qb:A][oc:B]C['a' for the right, 'b' for the top side.]
 (;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[sb]
 ;B[re]
 ;W[ra])
 (;B[oc]LB[pb:B][qb:A]C['a' is correct. 'b' is a mistake.]
 (;W[qb]
 ;B[pb]
 ;W[re]
 ;B[pf]
 ;W[rf]
 ;B[jd])
 (;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[re])))
 (;B[pc]
 ;W[re]
 ;B[ld]TR[qh]C[Now, the triangled stone is alone.]))
 (;W[pc]C[Hamete.]
 ;B[od]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[oc]
 ;W[pb]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[sc]
 ;B[pf]C[Correct punishment]))
 (;W[od]C[Invented by Wang Yang 5P. Good technique against san-ren-sei fuseki.]
 ;B[pe]
 ;W[pc]
 ;B[qc]
 ;W[qb]
 (;B[rc]
 ;W[oc]
 ;B[pf]
 ;W[kc]C[New joseki (2010).])
 (;B[oc]
 ;W[pb]
 ;B[nc]
 ;W[rd]
 ;B[pf]C[Very rare joseki.]))
 (;W[og]C[Joseki developed by O Meien 9P.]
 (;B[pf]
 (;W[pg]
 ;B[qg]
 ;W[pe]
 ;B[qe]
 ;W[of]
 ;B[rf]
 ;W[od]
 ;B[pc]
 ;W[oc]
 ;B[pf]
 ;W[oe]C[Equal])
 (;W[pe]
 ;B[oe]
 ;W[pg]
 ;B[qe]
 ;W[qg]C[Rare joseki. Black is favorable]))
 (;B[pj]C[Best way for Black]
 (;W[nd]
 ;B[pf]
 ;W[pg]
 ;B[qg]
 ;W[pe]
 ;B[qe]
 ;W[of]
 ;B[rf]C[Black is favorable, if White has no threats for starting this ko])
 (;W[nc]C[Most active way. Complicated]))))
 (;B[qi]LB[nc:b][qc:a][qd:e][of:c][pi:f][qn:d]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 Black 3, the two-space low pincer, at best indicates a special strategy.
 The two-space low pincer is not as forceful as the one-space pincer, nor as relaxed as the three-space pincer, which is most often used as a dual purpose move to pincer and extend at the same time. Neither fish nor fowl, the two-space low pincer is less able to secure territory compared to the one-space pincer, if the selected variation comes to that, and perhaps more likely to later come under attack if White establishes a base for White 2.
 White continues with 'a' to 'c'.
 'd' continues on the right side against a Black komoku. This variation explains when Black 3 can be applied.
 White 'e' and 'f' are not recommended.
 e5, d4, c3, b2, a1
+]
 (;W[qc]LB[pc:b][qd:a]C[White 4 is a natural choice.
 Black continues with 'a' or 'b'.]
 (;B[qd]
 ;W[pc]LB[rc:b][od:a]C[Black continues with 'a' or 'b'.]
 (;B[od]LB[oc:b][rd:a]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]
 ;B[pf]C[Black 3 does not contain White 2 as well as a one-space pincer
 would (the marked spot).]MA[qh])
 (;W[oc]
 ;B[nd]
 ;W[mc]
 ;B[le]))
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[pg]))
 (;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[qe]
 ;B[pf]LB[pg:b][qg:a]C[White continues with 'a', or begins an aggressive sequence with 'b'. White should have support in the lower right to play 'b'.]
 (;W[qg]
 ;B[oh])
 (;W[pg]C[White should have support in the lower right to play this way.]
 ;B[qg]
 ;W[og]
 ;B[rg]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[nc]
 ;W[pl]
 ;B[oi]
 ;W[mg])))
 (;W[nc]LB[nd:a][oe:c][pf:b]C[Black continues with 'a' or 'b' or 'c'.
+]
 (;B[nd]
 ;W[md]LB[oc:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]LB[oc:b][qc:a]C[White takes the corner with 'a', or builds thickness to the top with 'b'.]
 (;W[qc]C[White goes for the corner.]
 ;B[oc]
 ;W[qd]
 ;B[mc])
 (;W[oc]C[White begins a sequence to build thickness.]
 ;B[pc]
 ;W[od]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg]))
 (;B[oc]
 ;W[ne]
 ;B[od]
 ;W[mc]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[qh]
 ;W[qg]
 ;B[rd]))
 (;B[pf]LB[qc:a][pe:C][pg:b]C[White continues with 'a' or 'b'.]
 (;W[qc]LB[pc:a][qe:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]
 ;B[ph]
 ;W[kc])
 (;B[qe]
 ;W[pc]
 ;B[lc]
 ;W[mc]
 ;B[ld]))
 (;W[pg]
 ;B[qg]
 ;W[pe]
 ;B[of]LB[oe:c][qe:a][qh:b]C[White continues with 'a'. White 'b' is unreasonable. White 'c' likewise leads to a bad result for White.]
 (;W[qe]
 ;B[oe]
 ;W[rg]
 ;B[qh]LB[od:B][qd:A]C[White continues with 'a' or 'b'.]
 (;W[qd]
 ;B[oc]
 ;W[qc]
 ;B[nd])
 (;W[od]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[sf]
 ;B[ob]
 ;W[nb]
 ;B[sd]
 ;W[rh]
 ;B[ri]
 ;W[sh]
 ;B[oc]
 ;W[nd]
 ;B[oh]))
 (;W[qh]C[White 10 is a mistake.]
 ;B[rg]
 ;W[rf]
 ;B[og]
 ;W[ph]
 ;B[rh]
 ;W[oe]
 ;B[qe]
 ;W[re]
 ;B[qd]
 ;W[rd]
 ;B[od]
 ;W[ne]
 ;B[rc]
 ;W[pi]
 ;B[sd])
 (;W[oe]C[White 10 is not recommended.]
 ;B[qe]
 ;W[rf]
 ;B[re]
 ;W[nf]
 ;B[og]
 ;W[qd]
 ;B[rd]
 ;W[qc]
 ;B[rc]
 ;W[pc]
 ;B[ne]
 ;W[od]
 ;B[ng]))
 (;W[pe]LB[oe:a][qe:b]C[White 6 is not recommended.
 Black continues with 'a' or 'b'.]
 (;B[oe]
 ;W[qe]
 ;B[nd]
 ;W[oc]
 ;B[od]
 ;W[pg]
 ;B[of]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[qh]
 ;W[qg]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[qb])
 (;B[qe]
 ;W[oe]
 ;B[qd]
 ;W[pg]
 ;B[od]
 ;W[of]
 ;B[nd])))
 (;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[pg]))
 (;W[of]
 ;B[nd]
 ;W[oi]
 ;B[pk]
 ;W[lc]
 ;B[me]
 ;W[jd]
 ;B[qe]
 ;W[rf]
 ;B[re])
 (;AB[pq]
 ;W[qn]
 ;B[qp]
 ;W[qk]LB[pi:A][qi:3][qk:6][qn:4][qo:B]C[If Black had played 3 onto 'a' instead, White could have continued White 6 onto 'b'. Now he got only a more narrow group with 4.
 ])
 (;W[qd]C[White 4 is not recommended.]
 ;B[qc]
 ;W[pc]C[This cross-cut is a possible continuation.]
 ;B[od]
 ;W[oc]
 ;B[qe]
 ;W[rd]
 ;B[qb]C[White has no good continuation.])
 (;W[pi]LB[ph:b][pj:a]C[White 4 may lead to complications.
 Black continues with 'a' or 'b'.]
 (;B[pj]
 ;W[qh]
 ;B[qj]LB[nc:a][md:c][nd:b]C[White may switch directions by trying 'a' to 'c'.]
 (;W[nc]
 ;B[nd]
 ;W[md]LB[oc:a][ne:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oc]
 ;W[ne]
 ;B[od]LB[nb:b][mc:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mc]
 ;B[re])
 (;W[nb]C[White 14 attempts to later infiltrate the corner, but this move is not recommended.]
 ;B[me]
 ;W[ld]
 ;B[nf]LB[le:b][oi:a]C[White continues with 'a' or 'b'.]
 (;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[le]
 ;W[kd]
 ;B[pf]
 ;W[pg]
 ;B[qe])
 (;W[le]
 ;B[oe]
 ;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[lf]
 ;W[kf]
 ;B[lg]
 ;W[rd]
 ;B[rh]
 ;W[pg]
 ;B[rg]
 ;W[rf]
 ;B[qc])))
 (;B[ne]LB[oc:a][pc:b][qc:c]C[Black 11 is a mistake.
 White continues with 'a'. White 'b' is an overplay. White 'c' is likewise not recommended.]
 (;W[oc]LB[pc:a][qe:b]C[Black may try 'a' or 'b'.]
 (;B[pc]
 ;W[rd]
 ;B[rh]
 ;W[pg]
 ;B[rg]
 ;W[rf]LB[od:b][pe:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]
 ;W[oi])
 (;B[od]C[Black 19 is a mistake.]
 ;W[ld]C[White 20 prepares for a sacrifice play.]
 ;B[qg]
 ;W[of]
 ;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[mf]C[Black cannot escape or live in the corner.]))
 (;B[qe]LB[pf:b][pg:a]C[White continues with 'a'. White 'b' is too slow.]
 (;W[pg]
 ;B[pf]
 ;W[of]
 ;B[pe]
 ;W[qb]
 ;B[og]
 ;W[oi]
 ;B[ng]
 ;W[mi]C[White has the better position.])
 (;W[pf]C[White 14 is too slow.]
 ;B[pe]
 ;W[qb]
 ;B[oi]
 ;W[ng]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[nh])))
 (;W[pc]C[White 12 is unreasonable.]
 ;B[oc]
 ;W[ob]
 ;B[od]
 ;W[mb]
 ;B[qc]
 ;W[oi]
 ;B[lc]
 ;W[mc]
 ;B[pb])
 (;W[qc]C[White 12 nullifies White 4: better to have invaded without playing 4.]
 ;B[oc]
 ;W[qd]
 ;B[mc])))
 (;W[nd]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qe]
 ;B[od]
 ;W[rc]
 ;B[oi]
 ;W[og]
 ;B[mf]
 ;W[ng]
 ;B[me]
 ;W[mg]
 ;B[qc]
 ;W[rb]
 ;B[lc])
 (;W[md]
 ;B[oe]
 ;W[oi]
 ;B[qe]
 ;W[pf]
 ;B[oc]
 ;W[nc]
 ;B[ob]))
 (;B[ph]
 ;W[qh]
 ;B[qg]
 ;W[rh]
 ;B[oh]LB[pg:a][rg:b]C[White continues with 'a' or 'b'.]
 (;W[pg]
 ;B[og]
 ;W[rg]
 ;B[oe]
 ;W[pj]
 ;B[jc])
 (;W[rg]
 ;B[pj]
 ;W[nc]
 ;B[oe]
 ;W[rd]
 ;B[oi]
 ;W[qc]
 ;B[pc]))))
 (;B[qj]LB[nc:c][qc:a][md:e][nd:d][qd:b]C[Outdated.
 -Space Low Pincer = Sangen Basami = Sekan Hyeopgong = San Jia
 ---------------------------------------------------------------
 White continues with 'a', 'b', 'c', 'd' or 'e'.
 e5, d4, c3, b2, a1
+]
 (;W[qc]LB[pc:b][qd:a]C[Black continues with 'a'. Black 'b' is out of the question.]
 (;B[qd]
 ;W[pc]LB[oc:c][rc:b][od:a]C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]LB[nd:c][pf:a][dp:b]C[Black solidifies with 'a'.
 Variation 'b' shows the consequence of playing elsewhere.
 Black 'c' builds a grand moyo, but sacrifices too much territory doing so.]
 (;B[pf]C[
 * Joseki *]
 ;W[pg]LB[of:b][og:a]C[White attempts mischief. Black continues with 'a'. Black 'b' is no good.]
 (;B[og]
 ;W[of]
 ;B[nf]
 ;W[pe]
 ;B[oe]LB[pf:b][pi:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[pi])
 (;W[pf]
 ;B[ph]))
 (;B[of]C[Black 15 is a mistake.]
 ;W[pi]))
 (;B[]C[Black plays elsewhere.]
 ;W[of]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[mf]
 ;B[ld]
 ;W[kf])
 (;B[nd]C[Black attempts to build a great moyo, but gives away too much territory.]
 ;W[mc]
 ;B[md]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[ke]
 ;W[jd]))
 (;B[rc]C[Black 7 is not recommended, though may be reasonable with some support at top.]
 ;W[rb]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[pg]LB[me:a]C[Black is reluctant to push at 'a', but it is a good point for White later.]
 ;W[me])
 (;B[oc]LB[qj:3]SQ[pi]C[Black 7 is a mistake. The punishment is the same as in the variation of Black 3 being on the squared point, look there for continuations.]))
 (;B[pc]C[Black 5 is a mistake.]
 ;W[qd]
 ;B[pe]
 ;W[qg]C[Even with a stone at top as shown, Black should not play this way.]))
 (;W[qd]
 ;B[qc]
 ;W[pc]LB[qb:A][oc:B]C['a' or 'b'.]
 (;B[qb]LB[pb:B][oc:C][rd:A]C['a', 'b' or 'c'.]
 (;W[rd]
 ;B[od]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[rc]
 ;B[oc])
 (;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[qe])
 (;W[oc]
 ;B[od]
 ;W[nd]
 ;B[oe]
 ;W[mc]
 ;B[qe]))
 (;B[oc]
 ;W[pb]
 ;B[qe]
 ;W[rd]
 ;B[od]LB[ob:a][rc:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ob]
 ;B[re]
 ;W[rc]
 ;B[pf])
 (;W[rc]C[White 12 is not recommended.]
 ;B[ob]LB[qb:b][pe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[qb]
 ;W[rb]
 ;B[pa])
 (;W[qb]LB[re:b][pf:a]C[White 14 is not recommended. Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pf]
 ;W[re]
 ;B[pg])
 (;B[re]C[Black 15 is a mistake.]
 ;W[rf]
 ;B[pe]
 ;W[se]C[White is not as well contained as the alternate variation.])))))
 (;W[nc]LB[qc:d][nd:a][oe:b][pf:c]C[Best way to punish Black
  continues with 'a' or 'b'.
 Black 'c' is a mistake in direction. 'd' is inferior.]
 (;B[nd]C[Attaching on the side where there is no pincer is the rule.
 Nowadays this rule considered to be wrong]
 ;W[md]LB[oc:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]LB[oc:a][pc:d][qc:b][me:c]C[White continues with 'a', 'b' or 'c'.
 White 'd' is not recommended.]
 (;W[oc]LB[pc:a][pf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]LB[jc:a][od:e][re:c][pg:b][pi:d]C[White continues with 'a', 'b' to 'd'. White 'e' is not recommended.
 e5, d4, c3, b2, a1]
 (;W[jc]
 ;B[qe])
 (;W[pg]
 ;B[qe]LB[pe:b][re:a]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[re]LB[rd:b][pf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pf]
 ;W[rf]
 ;B[rd]LB[rc:B][ng:A]C['a' is usual. 'b' is a trick play.]
 (;W[ng]LB[pb:a][mf:b]C[Black continues with 'a' or 'b'.]
 (;B[pb])
 (;B[mf]
 ;W[kc]LB[ob:A][oj:B]C[Black 'a' is necesary. Playing elsewhere, such as 'b', is a mistake.]
 (;B[ob]C[
 * Joseki *])
 (;B[oj]C[Black 19 is a mistake.]
 ;W[rc]C[White gouges out the corner.]
 ;B[se]
 ;W[qc]
 ;B[qd]
 ;W[pb])))
 (;W[rc]LB[pb:A][se:B]C[White 16 is an attempted trick play. Black continues wtih 'a'.
 Black 'b' is a mistake.]
 (;B[pb]
 ;W[sd]
 ;B[mc]
 ;W[lc]
 ;B[mb]
 ;W[ld])
 (;B[se]C[Black 17 is a mistake.]
 ;W[sc]
 ;B[sd]
 ;W[qc]
 ;B[qd]
 ;W[pb])))
 (;B[rd]C[Black 13 is vulgar.]
 ;W[pe]
 ;B[qd]
 ;W[ng]
 ;B[od]
 ;W[kc]))
 (;W[pe]C[White 12 is an overplay.]
 ;B[re]
 ;W[ng]
 ;B[od]
 ;W[lc]
 ;B[me]
 ;W[kd]
 ;B[lf]))
 (;W[re]LB[pe:a][pf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]
 ;W[qh]
 ;B[kd]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[rd]
 ;W[oh]
 ;B[ng]
 ;W[rc]C[Continuation. White 20 does not work.]
 ;B[qe]
 ;W[rf]
 ;B[sd]
 ;W[qc]
 ;B[rb]C[Black 25 prevents White from connecting underneath.]
 ;W[qb]
 ;B[pb])
 (;B[pf]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[od]
 ;W[kc]
 ;B[pg]
 ;W[qh]
 ;B[oi]
 ;W[rc]C[White is sealed in, but there are gaps in Black's shape (aji).
 A White success.]))
 (;W[pi]LB[qe:b][pj:a]C[White 10 is a tough move. White intends to lean on Black's pincer stone, aiming to pushing through and cutting off Black 1 & 9.
 Black continues with 'a' or 'b'.]
 (;B[pj]LB[qi:a][oj:b]C[White continues with 'a' or 'b'.]
 (;W[qi]LB[oi:b][oj:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[oj]
 ;W[re]
 ;B[pe]
 ;W[kc]
 ;B[oi]
 ;W[rc])
 (;B[oi]C[Black 13 is not recommended.]
 ;W[oj]LB[oh:b][ri:a]C[Black continues with 'a' or 'b'.]
 (;B[ri]
 ;W[rh]
 ;B[rj]
 ;W[pg]CR[od]C[The push through now looms. The cut of White 14 is disagreeable for Black.])
 (;B[oh]
 ;W[rj]
 ;B[rk]
 ;W[ri])))
 (;W[oj]C[White 12 is a tough-minded move.]
 ;B[qi]
 ;W[ph]
 ;B[qe]
 ;W[ok]
 ;B[qm]LB[kd:b][oi:a]C[Black aims to cut at 'a' and play the checking extension of 'b'.]))
 (;B[qe]
 ;W[pj]
 ;B[kd]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[pf]
 ;W[qk]LB[lb:a][lc:b]C[Black continues with 'a' or 'b'.]
 (;B[lb]LB[mb:b][mc:a]C[White continues with 'a' or 'b'.]
 (;W[mc]
 ;B[id])
 (;W[mb]
 ;B[lc]
 ;W[mc]))
 (;B[lc]LB[mb:b][mc:a]C[White obviously continues with 'a'. White 'b'?]
 (;W[mc])
 (;W[mb]C[Yoshio Ishida's Dictionary of Basic Joseki calls this a "well-timed"
 sequence, but that is not necessarily apparent.]
 ;B[mc]
 ;W[kc]))))
 (;W[od]C[White 10 is not good.]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]LB[pg:a][qg:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pg])
 (;B[qg]C[Black 15 is a mistake.]
 ;W[pg]
 ;B[ph]
 ;W[og]
 ;B[qh]
 ;W[pb]
 ;B[qb]
 ;W[qc]LB[ob:b][qd:a]C[Black must play 'a'. Black 'b' is a fatal mistake.]
 (;B[qd]
 ;W[rc]
 ;B[rd]
 ;W[rb]
 ;B[rf]C[Black suffers a loss in gote.])
 (;B[ob]C[Black 23 loses the game.]
 ;W[qe]
 ;B[pa]
 ;W[qd]
 ;B[pb]
 ;W[rb]C[Black dies.]
 ;B[nb]
 ;W[mb]
 ;B[ra]
 ;W[rc]
 ;B[rf]LB[na:b][re:a]C[White can play 'a' or 'b' and win by a move.]))))
 (;B[pf]C[Black 9 is a fearful mistake.]
 ;W[pc]
 ;B[qe]LB[qg:a]C[White still threatens to extend to 'a' later.]))
 (;W[qc]LB[oc:a][qd:b]C[Black continues with 'a' or 'b'.]
 (;B[oc]LB[mc:b][qd:a]C[White continues with 'a' or 'b'.]
 (;W[qd]
 ;B[mc]TR[qj]C[Old joseki
 White is slightly better, because the marked stone is not effective.]
 ;W[]C[White plays elsewhere.]
 ;B[qh]C[Black plays a checking extension (post-joseki).]
 ;W[qg]
 ;B[ph])
 (;W[mc]
 ;B[qd]
 ;W[rd]LB[nb:B][rb:A][re:C]C['a' is joseki. 'b' is possible, 'c' is a mistake, because White can connect the corner to the top.]
 (;B[rb]
 ;W[rc]
 ;B[qb]
 ;W[qh]LB[ob:C][jd:B][oj:A]C[
 * Joseki *
 Black can continue on 'a' or 'b'. White cannot connect on 'c'.]
 ;W[ob]
 ;B[pb]
 ;W[pc]
 ;B[od]LB[nb:B][re:A])
 (;B[nb]LB[mb:b][rb:a]C[White continues with 'a'. White 'b' is bad.]
 (;W[rb]
 ;B[mb]LB[kc:a][kd:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[kc]
 ;B[kd]
 ;W[jd]
 ;B[lc]C[Black 19 is interesting.]
 ;W[ld]
 ;B[ke]
 ;W[lb]
 ;B[me]
 ;W[hc]LB[le:a]C[White will not necessarily connect if Black gives atari at 'a'.])
 (;W[kd]C[White 16 is a not recommended. White plays this way when insecure.]
 ;B[kc]LB[jc:a][jd:b]C[White continues with 'a' or 'b'. White 'b' is weak, but may be reasonable in a global context.]
 (;W[jc]
 ;B[lc]
 ;W[ld]
 ;B[jd])
 (;W[jd]
 ;B[jc])))
 (;W[mb]C[White 'b' is inconsistent with White's 3-3 invasion.]
 ;B[re]
 ;W[ob]
 ;B[pb]
 ;W[na]
 ;B[pc]C[White loses the corner, and White 2 has no meaning (though aji).]))
 (;B[re]C[Black 13 is a mistake.]
 ;W[rc]
 ;B[qe]
 ;W[ob]C[White connects underneath.]
 ;B[me]
 ;W[le]
 ;B[lf]
 ;W[ke])))
 (;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[od]LB[mb:a][mc:b]C[White continues with 'a' or 'b'.]
 (;W[mb]
 ;B[me]
 ;W[ld]
 ;B[oj]C[
 * Joseki *])
 (;W[mc]LB[nb:a][me:b]C[Black first cuts at 'a'. Black 'b' immediately is a mistake.]
 (;B[nb]C[The sacrifice cut is important. Compare to the other variation.]
 ;W[pb]
 ;B[me]
 ;W[kd]
 ;B[le]
 ;W[jc]
 ;B[oj])
 (;B[me]C[Black 15 is a mistake.]
 ;W[rc]
 ;B[rd]
 ;W[le]
 ;B[lf]
 ;W[ke]))))
 (;W[me]LB[oc:A][mf:B][nf:C]C['a' is joseki. 'b' is possible. 'c' is questionable.]
 (;B[oc]
 ;W[mc]LB[qd:b][nf:a]C[Black continues with 'a', or, for fighting, 'b'.]
 (;B[nf]
 ;W[qc]
 ;B[qd]
 ;W[rd]LB[nb:a][rb:b][re:c]C[Black continues with 'a' or 'b'.
 Black 'c' is a mistake.]
 (;B[nb]
 ;W[rb]
 ;B[mb]
 ;W[kc]
 ;B[mf]
 ;W[ke]C[
 * Joseki *])
 (;B[rb]
 ;W[rc]
 ;B[qb]
 ;W[qh]C[
 * Joseki *]
 ;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[kg]
 ;W[jf]LB[nb:a][rg:b]C[Black must play 'a'.
 Black 'b' looks tempting, but is a mistake.]
 (;B[nb])
 (;B[rg]C[Black 25 is a mistake.]
 ;W[rf]LB[nb:a][rh:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nb]LB[mb:b][rh:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rh]
 ;B[mb]
 ;W[kc])
 (;W[mb]C[White 28 is a mistake.]
 ;B[qg]
 ;W[pg]
 ;B[rh]LB[ob:b][pb:a]C[White may try 'a' or 'b'. Black is still connected.]
 (;W[pb]
 ;B[ob])
 (;W[ob]
 ;B[pb])))
 (;B[rh]C[Black 27 is a mistake.]
 ;W[ob]C[White can now connect and capture the two Black stones because of White 26 (from the Black peep of 25 and the pullback of 27).])))
 (;B[re]C[Black 15 is inexcusably submissive.]
 ;W[rc]
 ;B[qe]
 ;W[ob]C[White connects underneath.]))
 (;B[qd]C[Black 11 starts a fight.]
 ;W[nf]
 ;B[mf]
 ;W[ng]
 ;B[lf]
 ;W[jd]))
 (;B[nf]
 ;W[oc]
 ;B[pc]LB[od:A]C[White can later push on 'a'.]
 ;W[od]
 ;B[pe])
 (;B[mf]LB[mc:A][oc:B][nf:C]C['a' is correct. 'b' and 'c' are mistakes.]
 (;W[mc]
 ;B[pf]
 ;W[qc]
 ;B[qe]
 ;W[pc]
 ;B[lf])
 (;W[oc]
 ;B[pc]
 ;W[od]
 ;B[oe]
 ;W[pe]
 ;B[mc])
 (;W[nf]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[ng]
 ;B[oh])))
 (;W[pc]C[White 8 is not recommended.]
 ;B[oc]
 ;W[ob]
 ;B[od]
 ;W[mb]
 ;B[qc]
 ;W[pb]
 ;B[me]
 ;W[ld]LB[pg:b][ni:a]C[Black plays on a large scale with 'a', or the tighter 'b'.]
 (;B[ni]LB[qb:b][qd:a]C[White can cut at 'a'. If White plays elsewhere, Black 'b' is big.]
 (;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf])
 (;W[]C[White plays elsewhere.]
 ;B[qb]))
 (;B[pg]LB[qd:a][dp:b]C[White continues with the cut of 'a', or by playing elsewhere ('b').]
 (;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[pf])
 (;W[]C[White plays elsewhere.]
 ;B[qb]))))
 (;B[oc]
 ;W[ne]
 ;B[od]LB[nb:b][mc:a][me:d][of:c]C[White continues with 'a' to 'c'.
 White 'd' is a mistake.]
 (;W[mc]C[White 10 is suitable for a handicap game, as this leaves White in a difficult position.]
 ;B[pf]
 ;W[pg]
 ;B[of]LB[re:a][pi:b]C[White continues with 'a' or 'b'.]
 (;W[re]
 ;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]
 ;W[pi]
 ;B[pj]
 ;W[oi]C[
 * Joseki *]
 ;B[rh]
 ;W[qg]
 ;B[oj])
 (;W[pi]
 ;B[pj]
 ;W[oj]
 ;B[qi]
 ;W[qh]
 ;B[ok]
 ;W[oi]
 ;B[re]))
 (;W[nb]
 ;B[me]LB[ld:a][of:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ld]
 ;B[nf]
 ;W[le]
 ;B[oe]LB[rd:a][mg:b]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[lf]
 ;W[kf]
 ;B[lg]LB[qh:a][dp:b]C[White continues with 'a'. Playing elsewhere ('b') is a mistake.]
 (;W[qh]
 ;B[oj]
 ;W[rb])
 (;W[]C[White plays elsewhere, which is a mistake.]
 ;B[rg]
 ;W[rf]
 ;B[qg]
 ;W[qc]
 ;B[ob]
 ;W[rb]LB[lb:a][kc:b][jd:c]C[Black continues at 'a', 'b' or 'c']))
 (;W[mg]
 ;B[re]
 ;W[ng]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[oi]
 ;B[pi]
 ;W[oj]
 ;B[pk]))
 (;W[of]LB[mc:b][ld:a]C[White 12 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ld]
 ;W[mc]
 ;B[mf]
 ;W[kc]
 ;B[qe]LB[rf:b][pg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pg]
 ;B[ob]C[Black settles his group, leaving White with two weak groups.])
 (;W[rf]C[White 18 is a mistake.]
 ;B[pf]
 ;W[pg]
 ;B[nf]
 ;W[oe]
 ;B[og]C[White is caught in a snap-back.]))
 (;B[mc]C[Black 13 is a mistake.]
 ;W[ld]
 ;B[mb]
 ;W[mf]C[White gets away; the pincer stone seems a waste.])))
 (;W[of]
 ;B[mc]
 ;W[ld]LB[nb:a][oj:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nb])
 (;B[oj]C[Black 13 is a mistake.]
 ;W[nb]C[White 14 begins a sacrifice squeeze play.]
 ;B[lb]
 ;W[lc]
 ;B[mb]
 ;W[kb]
 ;B[ob]
 ;W[jc]))
 (;W[me]C[White 10 is a mistake.]
 ;B[mc]
 ;W[lc]
 ;B[nb]LB[mb:a][of:b]C[White may try 'a' or 'b'.]
 (;W[mb]
 ;B[pf]
 ;W[pg]
 ;B[of]C[White is split in two.])
 (;W[of]
 ;B[lb]))))
 (;B[oe]C[Black 5 aims for simplicity.]
 ;W[qc]
 ;B[qd]
 ;W[pc]LB[rc:d][md:b][me:a][pg:c]C[Black continues with 'a', or possibly the fighting move of 'b'. Black 'c' is not recommended. Black 'd' is a genuine mistake.]
 (;B[me]C[
 * Joseki *]
 ;W[ld]
 ;B[oj])
 (;B[md]C[Black 9 provokes a fight.]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[kd]LB[ld:b][mf:a]C[White continues with 'a', possibly 'b'.]
 (;W[mf]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[og]LB[pi:a]C[White has the shoulder hit of 'a' to keep the situation unsettled.])
 (;W[ld]C[White 14 is not recommended.]
 ;B[le]
 ;W[mc]
 ;B[mf]))
 (;B[pg]C[Capturing White 2 by playing Black 9 is too small in the early game. Black becomes over-concentrated.]
 ;W[od]LB[nd:A][pe:B]C['a' is correct, 'b' is inferior.]
 (;B[nd]
 ;W[oc]
 ;B[pe]
 ;W[md]
 ;B[ne]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe])
 (;B[pe]
 ;W[ne]
 ;B[nf]
 ;W[me]))
 (;B[rc]C[Black 9 is a mistake in direction.]
 ;W[rb]
 ;B[rd]LB[ne:a][pi:b]C[White continues with 'a' or 'b'.]
 (;W[ne]
 ;B[nf]
 ;W[me]
 ;B[pg]
 ;W[mf])
 (;W[pi]C[White 12 might be a good move in a handicap game.])))
 (;B[pf]C[Black 5 is a mistake in direction.
 When there are two small knight approach moves, the rule is to attach on the side where there is no pincer, then make full use of the influence of the pincer. The pincer goes to waste playing this direction.]
 ;W[pg]
 ;B[of]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rg]
 ;B[qc]
 ;W[rd]
 ;B[og]
 ;W[ph]
 ;B[jc]C[If Black plays 17...]
 ;W[kd]TR[qj]C[...the shoulder hit of White 18 makes Black gain problematic.
 The marked stone is in strange position as well])
 (;B[qc]
 ;W[oe]))
 (;W[nd]LB[ne:b][oe:d][qe:c][pf:a]C[Black continues with 'a', 'b', 'c', 'd'.]
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qe]LB[od:a][qd:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[od]LB[nc:b][qc:c][rc:a]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[rc]LB[nc:a][jd:b]C[Black continues with 'a' or 'b'.]
 (;B[nc]C[
 * Joseki *]
 ;W[mc]
 ;B[md]
 ;W[ne]LB[lc:b][ld:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ld]CR[mf]LB[lc:a][oc:b]C[Black aims to capture the stones by playing at the marked spot.
 White may try 'a' or 'b'. Neither work to White's advantage.]
 (;W[lc]
 ;B[kc]
 ;W[kb]
 ;B[kd]
 ;W[nb]
 ;B[oc]
 ;W[jb]
 ;B[mf])
 (;W[oc]
 ;B[nb]))
 (;B[lc]C[Black 15 is a mistake.]
 ;W[mb]LB[lb:b][nb:a]C[Black continues with 'a' or 'b'.]
 (;B[nb]
 ;W[lb]
 ;B[kc]
 ;W[ld]
 ;B[me]
 ;W[kd]LB[jc:b][mf:a]C['a' and 'b' are miai.])
 (;B[lb]
 ;W[nb]
 ;B[oc]
 ;W[ld]
 ;B[me]
 ;W[kd]LB[kb:b][mf:a])))
 (;B[jd]LB[nb:b][og:a]C[White continues with 'a', possibly 'b'.]
 (;W[og]
 ;B[me]
 ;W[ng]
 ;B[mf])
 (;W[nb]LB[pb:b][qc:a]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[rb]
 ;B[mf]
 ;W[pb]
 ;B[og]
 ;W[ph]
 ;B[rh]
 ;W[rg]
 ;B[oj])
 (;B[pb]))))
 (;W[nc]C[White 10 is an overplay.]
 ;B[qd]
 ;W[qh]
 ;B[oj]
 ;W[nh]
 ;B[me]
 ;W[kc]
 ;B[oc]C[Black gets a nice corner, and White has two insecure groups on either side.])
 (;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[rb]
 ;B[qg]
 ;W[qh]
 ;B[rg]LB[sc:A][rh:B]C[Neither 'a' nor 'b' work.]
 (;W[sc]
 ;B[rh])
 (;W[rh]
 ;B[og]
 ;W[ph]
 ;B[re]
 ;W[rf]
 ;B[sd])))
 (;B[qd]C[Black 9 is unreasonable.]
 ;W[pe]
 ;B[oe]
 ;W[od]LB[rd:A][qg:B]C['a' or 'b'.]
 (;B[rd]
 ;W[qh]
 ;B[mf]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[ld]C[Black needs another move in the corner, but is busy in the center.
 Not good.])
 (;B[qg]
 ;W[rd]
 ;B[rc]
 ;W[re]LB[qb:b][rg:a]C[Black continues with 'a' or 'b'.]
 (;B[rg]
 ;W[qb]LB[rb:b][qc:a]C[Neither Black 'a' nor 'b' work.]
 (;B[qc]
 ;W[rb]LB[pb:a][sc:b]C[Neither Black 'a' nor 'b' work.]
 (;B[pb]
 ;W[sc]
 ;B[pc]
 ;W[ob])
 (;B[sc]
 ;W[pc]
 ;B[pb]
 ;W[oc]
 ;B[sb]
 ;W[sd]))
 (;B[rb]
 ;W[qc]
 ;B[pc]
 ;W[pb]))
 (;B[qb]
 ;W[qh]))))
 (;B[ne]LB[qc:b][od:d][me:a][oe:c]C[Black 5 is a strong move.
 White continues with 'a', 'b' or 'c'. White 'd' is bad
 style, and not recommended.]
 (;W[me]
 ;B[oe]LB[qc:a][ld:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qc]C[
 * Joseki *]
 ;B[qd]
 ;W[pc]LB[oc:c][rc:a][md:b]C[Black continues with 'a' to 'c'.]
 (;B[rc]
 ;W[od]
 ;B[pf]
 ;W[rb]
 ;B[rd]
 ;W[md]
 ;B[oj]C[
 * Joseki *])
 (;B[md]
 ;W[nc]LB[nc:4][pc:8][qc:6][md:9][nd:10][pd:1][qd:7][me:12][ne:11][oe:5][qf:2][qj:3]C[A fight ensues. See the variation referenced by the numbers.])
 (;B[oc]LB[od:A][rd:B]C['a' is joseki, 'b' is a trick play.]
 (;W[od]
 ;B[ob]LB[nc:a][md:b]C[White continues with 'a' or 'b'.]
 (;W[nc]
 ;B[rc]
 ;W[pe]
 ;B[qe]
 ;W[pf]
 ;B[og]LB[rd:A][ng:B]C['a' is correct. 'b' is a mistake.]
 (;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[pb]
 ;B[rf]
 ;W[ld]
 ;B[ng]C[
 * Joseki *])
 (;W[ng]
 ;B[of]
 ;W[oh]
 ;B[pg]
 ;W[rf]
 ;B[re]
 ;W[sf]
 ;B[qb]
 ;W[ph]
 ;B[qg]
 ;W[rh]
 ;B[mf]))
 (;W[md]
 ;B[rc]
 ;W[pe]
 ;B[qe]
 ;W[pf]LB[nf:a][og:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nf]
 ;W[pi])
 (;B[og]C[Black 19 is a mistake.]
 ;W[ng]
 ;B[of]
 ;W[oh]
 ;B[pg]
 ;W[qh]
 ;B[nh]
 ;W[ph]
 ;B[nf]
 ;W[mg]
 ;B[qg]
 ;W[rf])))
 (;W[rd]LB[md:A][re:B]C['a' is the correct punishment. 'b' is a mistake.]
 (;B[md]
 ;W[ob]
 ;B[nb]
 ;W[mc]
 ;B[ld]
 ;W[nc]
 ;B[od]
 ;W[mb]
 ;B[rc]
 ;W[qb]
 ;B[re]LB[lb:A]C[Later, Black has 'a'.])
 (;B[re]
 ;W[rc]
 ;B[qe]
 ;W[od]LB[nc:B][md:A]C[Neither 'a' nor 'b' work.]
 (;B[md]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[ic]
 ;W[pf]
 ;B[pe]
 ;W[rf]
 ;B[se]LB[mf:B][pi:A]C['a' is correct. 'b' is a mistake.]
 (;W[pi]
 ;B[pj]
 ;W[ni])
 (;W[mf]
 ;B[nf]
 ;W[ng]
 ;B[og]LB[of:A][oh:B]C[Neither 'a' nor 'b' work.]
 (;W[of]
 ;B[mg]
 ;W[nh]
 ;B[lf])
 (;W[oh]
 ;B[mg]
 ;W[nh]
 ;B[lf])))
 (;B[nc]
 ;W[md]
 ;B[mc]
 ;W[pf]
 ;B[pe]
 ;W[rf]
 ;B[se]
 ;W[mf]
 ;B[ng]
 ;W[nf]
 ;B[of]
 ;W[og]
 ;B[pg]
 ;W[oh]
 ;B[sf]
 ;W[sg])))))
 (;W[ld]LB[qc:a][pg:b]C[White 8 is not recommended. Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qc]C[Black gets a good result whatever follows.])
 (;B[pg]C[Black 9 is not recommended.]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[rc]
 ;W[od]
 ;B[pf]
 ;W[rb]
 ;B[rd]CR[oj]C[Now Black 9 is misplaced: it should be at the marked location.])))
 (;W[qc]
 ;B[qd]LB[pc:a][od:b]C[White continues with 'a'. White 'b' is a trick play.]
 (;W[pc]
 ;B[od]
 ;W[oc]LB[md:b][of:a]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[md]
 ;B[oj]C[
 * Joseki *])
 (;B[md]
 ;W[nc]
 ;B[of]
 ;W[me]LB[ld:A][mf:B]C['a' is correct, 'b' gives White too much territory.]
 (;B[ld]
 ;W[mf]LB[pg:A][oh:B]C['a' or 'b'.]
 (;B[pg]
 ;W[ke]
 ;B[jc])
 (;B[oh]
 ;W[rd]
 ;B[re]
 ;W[qe]
 ;B[rc]))
 (;B[mf]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[kf]
 ;W[je]
 ;B[oj])))
 (;W[od]LB[pc:a][oe:b]C[White 8 is a trick play. Black continues with 'a'. Black 'b'
 is a mistake.]
 (;B[pc]
 ;W[oe]LB[pf:a][dp:b]C[Black continues with 'a'. Black may also play elsewhere ('b').]
 (;B[pf]
 ;W[pe]
 ;B[qe]
 ;W[qg]LB[of:a][pg:b]C[Black continues with 'a' or 'b'.]
 (;B[of]
 ;W[nf]
 ;B[ph]
 ;W[me]
 ;B[oh])
 (;B[pg]
 ;W[ph]
 ;B[nf]C[One of the two White groups is forfeit.]))
 (;B[]C[Black plays elsewhere.]
 ;W[oi]LB[rb:a]C[White 11 creates flexible shape.
 White now threatens mischief by playing 'a'.]))
 (;B[oe]C[Black 9 is a mistake.]
 ;W[pc]C[Now White has played the vital point of 8.]
 ;B[pe]
 ;W[md]LB[rd:A]C[Later, White 'a' is sente.])))
 (;W[oe]C[With the board as is, White 6 is not recommended.]
 ;B[od]LB[pe:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[pe]
 ;B[qd]C[
 * Joseki *
 Black 9 is the vital point of this shape.]
 ;W[nc]C[
 If you know the follow-up, please email: kogo@waterfire.us.])
 (;W[of]
 ;B[md]
 ;W[nc]
 ;B[mc]LB[nb:a][ob:b]C[White continues with 'a' or 'b'.]
 (;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[pc]LB[ob:a][qb:b]C[Now 'a' and 'b' are miai.])
 (;W[ob]
 ;B[mb]C[According to Ishida's Dictionary of Basic Joseki, Black wins the capturing race.]
 ;W[qb]
 ;B[oc]
 ;W[nb]
 ;B[pb])))
 (;W[od]C[White 6 is obviously bad style, but seems possible. Nonetheless, Black should come out with a favorable result.]
 ;B[oe]LB[pc:a][pe:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pc]LB[qc:a][qd:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]C[Black 9 is a tesuji.]
 ;W[qd]
 ;B[pe]LB[oc:b][qe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qe]
 ;B[oc]
 ;W[pb]
 ;B[nc]
 ;W[qb]
 ;B[md]C[Black 17 makes the "tortoise shell" shape, supposedly a shape twice as strong as ponnuki.])
 (;W[oc]C[White 12 is a mistake.]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[me]))
 (;B[qd]C[Black 9 is a mistake.]))
 (;W[pe]C[White 8 is not recommended.]
 ;B[qd]LB[md:a][pg:b]C[White may try 'a' or 'b'. Either way, Black should be able to wrest an advantageous position.]
 (;W[md]
 ;B[pg])
 (;W[pg]
 ;B[md]))))
 (;B[qe]C[Black 5 is a strong response.]
 ;W[pf]
 ;B[oe]LB[qc:B][pe:A]C[The combination of Black 5 and 7 may be unreasonable unless Black's neighboring positions are strong.
 'a' is joseki, 'b' is inferior.]
 (;W[pe]LB[od:a][qd:b]C[Black continues with 'a'. Black 'b' is hard to fathom.]
 (;B[od]
 ;W[qd]
 ;B[qc]
 ;W[re]LB[rc:B][rd:A]C['a' or 'b'.]
 (;B[rd]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[nc]C[
 * Joseki *])
 (;B[rc]C[Black 13 unwillingness to fight the ko contradicts Black's original strategy of the diagonal attachement.]
 ;W[nc]C[White 14 starts a sequence where it's hard to tell who's attacking whom; a big change from Black's early uncompromising moves.]
 ;B[ne]
 ;W[me]
 ;B[mf]
 ;W[le]
 ;B[og]
 ;W[ph]))
 (;B[qd]C[Black 9 is hard to justify.]
 ;W[od]
 ;B[ne]
 ;W[pi]
 ;B[me]
 ;W[ob]C[Black faces a hard fight. The three Black stones in the corner may have to fight for life, and three Black stones in the center are a good attack target.]))
 (;W[qc]
 ;B[pc]LB[qd:A][re:B]C['a' is correct, 'b' is inferior.]
 (;W[qd]LB[pe:B][re:A]C['a' is correct, 'b' is only good, if Black is already strong on the top side.]
 (;B[re]
 ;W[pe]
 ;B[qb]
 ;W[od]
 ;B[rc]
 ;W[nf])
 (;B[pe]
 ;W[re]
 ;B[rd]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[of]
 ;W[ph]
 ;B[qh]
 ;W[rg]
 ;B[pg]
 ;W[qg]
 ;B[og]
 ;W[jd]))
 (;W[re]
 ;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[nf]
 ;B[of]
 ;W[og]
 ;B[ng])))
 (;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[rc]
 ;W[od]
 ;B[pf]LB[rb:A][ne:B]C['a' is joseki, though 'b' is possible.]
 (;W[rb]
 ;B[rd]LB[ne:a][pg:b]C[
 * Joseki *
 White 'a' is a possible continuation. White 'b' is not recommended if the shape at the top is unsettled.]
 (;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[mg]
 ;B[nh])
 (;W[pg]LB[ne:A][og:B]C[White 14 is not recommended with the shape at top unsettled; the move is something of an overplay. White 14 is a tactic for stirring complication, as in a handicap game.]
 (;B[ne]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[le]LB[kd:a][qh:b]C[White continues with 'a' or 'b'.]
 (;W[kd]
 ;B[qh]
 ;W[qg]
 ;B[oh]
 ;W[og]
 ;B[ng]C[White must abandon the stones on the right, though they retain some aji.])
 (;W[qh]
 ;B[kd]
 ;W[kc]
 ;B[jc]
 ;W[lb]
 ;B[kb]
 ;W[lc]
 ;B[jd]))
 (;B[og]
 ;W[pi])))
 (;W[ne]
 ;B[nf]
 ;W[pg]LB[re:A][og:B]C['a' is correct. 'b' is a mistake.]
 (;B[re])
 (;B[og]
 ;W[rd]
 ;B[re]
 ;W[qe]
 ;B[sd]
 ;W[pe]))))
 (;W[md]LB[nc:d][nd:a][rd:e][oe:b][pf:c]C[Black continues with 'a' or 'b'. Attaching at 'c', on the side with the pincer, is not good. 'd' is possible. 'e' is weak.]
 (;B[nd]LB[mc:d][nc:a][me:c][ne:b]C[White continues with 'a', 'b' or 'c'. White 'd' is not recommended.]
 (;W[nc]
 ;B[ne])
 (;W[ne]
 ;B[nc]LB[qd:b][oe:a]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[qd]LB[mc:b][me:c][lf:a]C[
 * Joseki *
 White continues with 'a'.
 'b' and 'c' are inferior.]
 (;W[lf]
 ;B[mc]
 ;W[ld])
 (;W[mc]
 ;B[me]
 ;W[og]
 ;B[le]
 ;W[kc]
 ;B[mb]
 ;W[lb]
 ;B[nb]
 ;W[kd]
 ;B[lg]TR[qj]C[The triangled Black stone limits the right White group.])
 (;W[me]
 ;B[lb]))
 (;W[qd]LB[qc:b][me:a]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[me]LB[qc:A][oe:B][of:C]C['a' is correct. 'b' is a mistake. 'c' is possible.]
 (;W[qc]
 ;B[nf])
 (;W[oe]
 ;B[pe]
 ;W[pf]
 ;B[pc]
 ;W[qe]
 ;B[ld]
 ;W[mf]
 ;B[le]TR[qj]C[The triangled Black stone limits the right White group.])
 (;W[of]
 ;B[ld]
 ;W[mf]
 ;B[le]
 ;W[pc]
 ;B[pe]
 ;W[qc]
 ;B[lf]))
 (;B[qc]C[Black 9 is submissive. Nothing good comes to Black from this variation.]
 ;W[pe]LB[pc:c][od:a][rd:b]C[Black continues with 'a' to 'c'.]
 (;B[od]
 ;W[oe])
 (;B[rd]
 ;W[qe]
 ;B[oe]
 ;W[of]
 ;B[od]
 ;W[mf])
 (;B[pc]
 ;W[mf]))))
 (;W[me]
 ;B[pf]
 ;W[pg]
 ;B[of]LB[nc:B][qd:A]C['a' or 'b'.]
 (;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]LB[nc:b][qh:a]C[White continues with 'a' or 'b'.]
 (;W[qh]
 ;B[nc]C[
 * Joseki *])
 (;W[nc]
 ;B[oc]
 ;W[ne]
 ;B[od]))
 (;W[nc]
 ;B[oc]
 ;W[ne]
 ;B[od]
 ;W[nb]
 ;B[pi]
 ;W[rd]
 ;B[qg]
 ;W[qc]
 ;B[ob]
 ;W[rg]
 ;B[qh]
 ;W[rf]
 ;B[nh]))
 (;W[mc]C[White 6 is a heavy move.]
 ;B[nc]LB[rd:a][me:b]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[me]
 ;W[kd]
 ;B[qc]
 ;W[qh]
 ;B[oj]
 ;W[oh]
 ;B[nf])
 (;W[me]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc])))
 (;B[oe]LB[qc:b][rd:a][og:c]C[White continues with 'a' or 'b'. 'c' is inferior.]
 (;W[rd]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qc]
 ;B[pc])
 (;W[qc]
 ;B[qd]LB[pc:b][rd:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[nc]
 ;B[nf]LB[oc:A]TR[kc]C[
 * Joseki *
 Later, Black continues on 'a' only with a stone on the triangled position.]
 (;AB[kc]
 ;B[oc]C[Later, Black can continue here.]
 ;W[ob]
 ;B[nb]LB[mb:A][pb:B]C[Now, 'a' and 'b' are miai.])
 (;B[oc]
 ;W[ob]
 ;B[nb]LB[pb:A][pc:B]C['a' is recommended, 'b' leads to a ko.]
 (;W[pb]
 ;B[mb]
 ;W[lc])
 (;W[pc]
 ;B[nd])))
 (;W[pc]C[White 8 is not recommended.]
 ;B[oc]
 ;W[ob]
 ;B[nc]C[White 4 is isolated, and White cannot connect to 2 either.]))
 (;W[og]
 ;B[qe]LB[mf:A][rf:B]C['a' or 'b'.]
 (;W[mf]
 ;B[rf])
 (;W[rf]
 ;B[nf]
 ;W[ng]
 ;B[mf])))
 (;B[pf]C[Black 5 is not recommended. Attaching on the side of the pincer in a double approach situation is almost never good.]
 ;W[pg]
 ;B[of]LB[qd:A][qe:B]C['a' or 'b'.]
 (;W[qd]LB[qc:A][qe:B]C['a' or 'b'.]
 (;B[qc]
 ;W[qe]
 ;B[pc]LB[nc:B][qh:A]C['a' or 'b'.]
 (;W[qh]LB[nc:a]C[White 'a' is sente, so White's second approach move has good development potential.])
 (;W[nc]
 ;B[pe]
 ;W[qh]))
 (;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rg]
 ;B[qc]
 ;W[rd]TR[md]C[The wall is restricted by the triangled White stone.]))
 (;W[qe]
 ;B[qd]
 ;W[qi]
 ;B[pj]
 ;W[pe]
 ;B[oe]
 ;W[od]LB[oc:A][nd:B]C['a' is correct. 'b' is inferior.]
 (;B[oc]
 ;W[nd]
 ;B[og]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[ph]
 ;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[qc]
 ;W[sb]
 ;B[ob]
 ;W[qg]
 ;B[mb])
 (;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[nb]
 ;W[qc]
 ;B[me])))
 (;B[nc]
 ;W[nd]
 ;B[mc]
 ;W[lc]
 ;B[od]
 ;W[kd]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qh])
 (;B[rd]
 ;W[oe])))
 (;B[ph]LB[nc:d][qc:b][nd:e][qd:c][of:a]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 ----------------------------------------------------------------------------
 Unknown in classical Go, Black 3 shows a modern approach to fuseki.
 White plays 'a', 'b', 'c', 'd' or 'e'.
 With an extension the marked spot, Black would welcome the invasion of 'b'.
 ]MA[jd]
 (;W[of]
 ;B[nd]LB[qc:b][rd:a]C[White continues with 'a'. White 'b' is not recommended, but O Rissei (9p) likes this move.]
 (;W[rd]LB[qc:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[rh]LB[jc:B][kc:C][og:A]C[
 The result is equal
+]
 (;B[og]LB[nf:A][og:9][pg:B][qg:C]C[White must defend against Black 9.
 'a' is good defense.
 'b' is not recommended.
 'c' is the Black attack after playing elsewhere.]
 (;W[nf]
 (;B[kc]
 ;W[pe]C[Important move to prevent a ko fight.])
 (;B[qg]
 ;W[rg]
 ;B[pf]
 ;W[pe]
 ;B[qe]C[Later Black may start this ko fight.]))
 (;W[pg]
 ;B[qh]
 ;W[rg]
 ;B[qj]
 ;W[ng]
 ;B[oh]
 ;W[mf]
 ;B[kc]C[Now Black is solid on both sides, bad for White.])
 (;B[qg]
 ;W[rg]
 ;B[pf]
 ;W[pe]
 ;B[qe]C[Ko for life, not what White wanted.]))
 (;B[jc])
 (;B[kc]
 ;B[og]C[Later, the game continued like this.]
 ;W[ne]
 ;B[ng]
 ;W[md]
 ;B[od]
 ;W[pf]
 ;B[me]
 ;W[ld]
 ;B[mf]C[White ladder.]
 ;W[kd]
 ;B[jd]
 ;W[kf]
 ;B[mc]
 ;W[lc]
 ;B[lb]
 ;W[je]
 ;B[jb]
 ;W[id]
 ;B[jc]
 ;W[qi]
 ;B[oj]
 ;W[ie]))
 (;B[qg]LB[rf:B][pg:A]C['a' is typical. 'b' is old style.]
 (;W[pg]
 ;B[qh]
 (;W[rf]C[Slow]
 ;B[qc]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[ni]
 ;W[mh])
 (;W[qc]
 ;B[rf]
 (;W[re]
 ;B[qe]
 ;W[pf]
 ;B[rg]
 ;W[ob]C[Modern joseki])
 (;W[qe]C[Joseki, but somewhat slack for White.])))
 (;W[rf]
 ;B[qc]LB[mf:a][oh:c][pk:b]C[White continues with 'a', 'b' or 'c'.])))
 (;W[qc]C[White 6 is not recommended.]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]LB[qe:b][rf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rf]LB[ob:a][qg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ob]
 ;B[qg]C[Black is very thick])
 (;W[qg]C[White 12 is a mistake.]
 ;B[qh]
 ;W[rg]
 ;B[qe]
 ;W[ob]
 ;B[rh]LB[og:A][sg:B]C['a' White stones heavy, 'b' White stones dead.]
 (;W[og]
 ;B[sg])
 (;W[sg]
 ;B[og]
 ;W[oe]
 ;B[pf]
 ;W[pg]
 ;B[od]
 ;W[pe]
 ;B[ng])))
 (;B[qe]C[Black 11 is a mistake.]
 ;W[ob]
 ;B[qg]LB[rf:a]C[White has the aji of 'a' later.])))
 (;W[qc]LB[pc:a][qd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pc]
 ;W[qd]
 ;B[pe]LB[qb:b][qe:a][pf:c]C[White continues with 'a', 'b' or 'c'.]
 (;W[qe]
 ;B[pf]LB[pg:b][qg:a]C[White continues with 'a'. White 'b' is a bit unreasonable.]
 (;W[qg]
 ;B[pg]C[
 * Joseki *])
 (;W[pg]LB[og:b][qg:a]C[White 10 is an overplay.
 Black continues with 'a'. Black 'b' is too mild.]
 (;B[qg]
 ;W[og]
 ;B[rg]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[nc])
 (;B[og]C[Black 11 is too kind to White.]
 ;W[qg]
 ;B[oh])))
 (;W[qb]
 ;B[pf]
 ;W[qg]
 ;B[pg]LB[qi:A]C[White cannot jump to 'a' now.]
 ;W[qi]
 ;B[qh]
 ;W[rh]
 ;B[rg])
 (;W[pf]
 ;B[qe]
 ;W[re]
 ;B[rd]
 ;W[rc]
 ;B[rf]
 ;W[sd]LB[of:A][rg:B]C['a' or 'b'.]
 (;B[of]
 ;W[rg]
 ;B[qg]
 ;W[sf]
 ;B[pg]
 ;W[rf]
 ;B[ng])
 (;B[rg]
 ;W[of]
 ;B[md])))
 (;B[qd]C[Black's pincer is in acceptable position.]
 ;W[pc]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]LB[pf:a]C[Black 'a' would make Black somewhat over-concentrated, but doing nothing leaves White open to setting White 2 in motion. Still, Black's shape is not bad after tenuki.])
 (;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]
 ;B[ob]C[Complicated, but possible])))
 (;W[qd]
 ;B[qc]
 ;W[pc]LB[oc:A][od:B]C['a' is joseki, 'b' is inferior.]
 (;B[oc]
 ;W[pb]
 ;B[qe]
 ;W[rd]LB[od:A][pe:B]C['a' is joseki and makes a wall to the top side. 'b' is a variaton and give White the choice of the direction of the Black wall.]
 (;B[od]LB[rc:A][pe:B]C['a' is joseki, 'b' slightly inferior.]
 (;W[rc]
 ;B[ob]
 ;W[qb]
 ;B[pf]C[
 * Joseki *])
 (;W[pe]
 ;B[oe]
 ;W[re]
 ;B[og]))
 (;B[pe]LB[ob:A][re:B]C[If 'a', Black wall faces the right side. If 'b', Black wall faces the top side.]
 (;W[ob]
 ;B[re]
 ;W[rc]
 ;B[nc])
 (;W[re]
 ;B[ob]
 ;W[qb]
 ;B[pf]
 ;W[qg]
 ;B[pg])))
 (;B[od]
 ;W[rc]
 ;B[qb]
 ;W[re]LB[rb:B][pf:A]C['a' keeps the Black stones connected. 'b' tries to attack the White stones.]
 (;B[pf]
 ;W[ob]
 ;B[mc]
 ;W[pb]
 ;B[qg])
 (;B[rb]
 ;W[of]
 ;B[qk])))
 (;W[nc]
 ;B[pf]LB[qc:A][pe:B][pg:C]C['a' is joseki. 'b' is a mistake and loses a big corner for a small wall to the right side. 'c' is a mistake, because the White corner will be more tightly enclosed than in the joseki.]
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]
 ;B[jd]C[
 * Joseki *])
 (;W[pe]
 ;B[qe]
 ;W[oe]
 ;B[qd]
 ;W[pg]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[qg]
 ;B[nd])
 (;W[pg]
 ;B[og]
 ;W[qg]
 ;B[qh]
 ;W[pe]
 ;B[of]
 ;W[qd]
 ;B[oe]
 ;W[qe]
 ;B[oc]
 ;W[qc]
 ;B[nd]))
 (;W[nd]
 ;B[pf]LB[qc:A][pe:C][pg:B]C['a' is joseki.
 'b' is inferior and trades the corner for outside influence, White needs the ladder.
 'c' is a mistake and loses a big corner for a small wall to the right.]
 (;W[qc]LB[pc:A][qe:B][ph:3]C['a' is correct, 'b' is a mistake with Black 3.
+]
 (;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]
 ;B[jd])
 (;B[qe]
 ;W[pc]LB[qf:2][qg:A]C[Later White 2 can escape on 'a'.
 ]))
 (;W[pg]LB[og:B][qg:A]C['a' is correct. 'b' is a mistake.]
 (;B[qg]
 ;W[og]LB[qe:B][qh:A]C['a' or 'b'. White needs the ladder for 'b'.]
 (;B[qh]
 ;W[pe]LB[qe:A][of:B]C['a' is correct. 'b' is nonsense.]
 (;B[qe]
 ;W[of]
 ;B[rf]
 ;W[qd]
 ;B[pf]
 ;W[oe]
 ;B[qc])
 (;B[of]
 ;W[oe]
 ;B[nf]
 ;W[qd]))
 (;B[qe]
 ;W[qh]
 ;B[rf]
 ;W[rg]
 ;B[qf]
 ;W[pi]LB[lc:C][nd:4][of:B][rh:A]C[Black lives in the corner, so shouldn't provoke a White ponnuki by playing A, but use the ladder for a ladder breaker. So, Black is still better. One ladder breaker is 'b' to capture White 4, so an attack against White 4 like C is sente.]))
 (;B[og]
 ;W[qg]
 ;B[qh]
 ;W[pe]
 ;B[of]
 ;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[re]
 ;W[rd]
 ;B[rg]
 ;W[pc]C[White has got more points.]))
 (;W[pe]
 ;B[qe]
 ;W[oe]
 ;B[qd]
 ;W[pg]
 ;B[of]LB[og:A][qg:B]
 (;W[og]
 ;B[nf]
 ;W[qg]
 ;B[md])
 (;W[qg]
 ;B[og]
 ;W[ri]
 ;B[oh]
 ;W[qj]
 ;B[mc]
 ;W[md]
 ;B[nc]
 ;W[ld]
 ;B[od]
 ;W[ne]
 ;B[lh]))))
 (;B[pi]LB[nc:c][qc:a][nd:d][of:b][qk:e]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 Black 3 is used most often when Black has an extension at top.
 White continues with 'a', 'b', 'c' or 'd'. 'b' leads to the Cataccio joseki which is used to reduce a big Black moyo, but not advisable in other cases. 'e' is a special strategy.
+]
 (;W[qc]LB[pc:b][qd:a]C[Black continues with 'a' or 'b'. 'b' is played when Black
 has support at top.]
 (;B[qd]C[When Black has no extension at top.]
 ;W[pc]LB[oc:b][od:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]
 ;B[pf]C[
 * Joseki *])
 (;B[oc]LB[ob:c][rc:a][rd:b]C[Black 7 is a mistake.
 White continues with 'a', possibly 'b'. White 'c' is not recommended.]
 (;W[rc]LB[od:a][rd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[od]
 ;W[rd]
 ;B[kd]C[Black plays an extension towards the top as shown (11 being just one possible point; others nearby may be preferred). Black may also play elsewhere.
 This sequence is very favoable to White.])
 (;B[rd]C[Black prevents White's attempt to connect, but at considerable cost.]
 ;W[od]C[Black has no adequate continuation, as either the Black 7 cutting stone or three Black stones are subject to capture.]
 ;B[oe]C[Black gives up on the cutting stone.]
 ;W[nd]
 ;B[pf]
 ;W[nc]C[The result is very favorable to White, as White gains territory
 and thickness.
 White 2 still has aji.]))
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[od]LB[nc:b][pf:a]C[Black continues with 'a'. Black 'b', or descending from 7 is a mistake.]
 (;B[pf]C[At this point, Black must submit with 13.]
 ;W[nc]
 ;B[oe]
 ;W[nd])
 (;B[nc]C[Black 13 or descending from 7 is not good.]MA[ob]
 ;W[rf]LB[oe:a][se:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[oe]
 ;W[se]
 ;B[pe])
 (;B[se]C[Black 15 is a mistake.]
 ;W[oe]C[Black is doomed.])))
 (;W[ob]LB[nb:b][nc:a]C[White 8 fails to punish Black for playing 7, a missed opportunity.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe])
 (;B[nb]C[Black 9 is unreasonable. Black has too many cutting points.]
 ;W[od]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[pe]))))
 (;B[pc]C[When Black has an extension at top.]
 ;W[qd]
 ;B[pe]LB[qb:a][qe:b][pf:c][qg:d][rg:e]C[White continues with 'a', 'b', 'c', 'd' or 'e'.
 e5, d4, c3, b2, a1]
 (;W[qb]LB[pb:b][pf:a]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[qg]
 ;B[pg]C[
 * Joseki *]
 ;W[pb]LB[ob:B][nc:A]C[Continuation later
 Black answers on 'a' or 'b'.]
 (;B[nc])
 (;B[ob]
 ;W[nb]
 ;B[nc]))
 (;B[pb]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[pg]
 ;W[nf]LB[oe:a][qe:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oe]
 ;W[rg]
 ;B[qg]
 ;W[rf]
 ;B[qi]
 ;W[ng]
 ;B[md]
 ;W[ni])
 (;B[qe]C[Black 15 is a mistake, upsetting Black's strategy of gaining thickness for less than 20 points of territory.]
 ;W[oe]
 ;B[re])))
 (;W[qe]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qg]LB[ng:a][nh:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ng]LB[nh:a][mi:b]C[
 * Joseki *
 White hopes later to play 'a', while Black would like to eliminate the White aji with Black 'b'.])
 (;B[nh]C[Black 15 is a mistake.]
 ;W[ng]
 ;B[oi]
 ;W[of]
 ;B[oh]
 ;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[qb]
 ;W[od]
 ;B[pa]
 ;W[oe]
 ;B[pb]
 ;W[nb]))
 (;W[pf]
 ;B[qe]
 ;W[re]LB[rd:a][rf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rd]LB[rc:A][rg:B]C['a' is joseki, 'b' is good only if White is very strong on the right, while the top is worthless.]
 (;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[of]LB[og:b][rg:a]C[White continues with 'a' or 'b'.]
 (;W[rg]LB[og:A][qg:B]C['a' is joseki, 'b' takes sente.]
 (;B[og]LB[lc:A][mc:B]C[Later, White invades on 'a' or 'b'.]
 (;W[lc]
 ;B[kc]
 ;W[nc]
 ;B[ne]
 ;W[kb]
 ;B[jb]
 ;W[kd]
 ;B[jc]
 ;W[md]
 ;B[ke]
 ;W[ob]
 ;B[pb]
 ;W[mb])
 (;W[mc]
 ;B[ld]
 ;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[nb]
 ;B[od]
 ;W[oa]))
 (;B[qg]
 ;W[pg]
 ;B[og]
 ;W[qh]
 ;B[ph]
 ;W[sf]))
 (;W[og]LB[ng:b][pg:a]C[Black continues with 'a' or 'b'.]
 (;B[pg]
 ;W[qg]LB[rg:A][ph:B]C['a' is joseki, 'b' is inferior.]
 (;B[rg]LB[ph:B][qh:A]C[Black 19 is a sacrifice.
 'a' is correct, 'b' is very bad without the ladder.]
 (;W[qh]
 ;B[ph]
 ;W[ri]LB[nf:a][rj:b]C[Black continues with 'a'. Black 'b' is playable, but not recommended.]
 (;B[nf]LB[qj:b][dp:a]C[
 * Joseki *
 White can play elsewhere ('a'), or continue locally with 'b'.]
 (;W[]LB[oj:b][pj:c][qj:a][pk:e][qk:d][ql:f]C[White plays elsewhere. Black 'a' through 'f' are sente.]
 (;B[qj]LB[lc:c][mc:b][nd:d][rh:a]C[Black 24, otherwise Black plays 'a' and captures the White stones.
 Later, White invades on 'b' or c, not on 'd'.]
 (;W[mc]
 ;B[jf]
 ;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[od]
 ;W[nb]
 ;B[nc]
 ;W[oa])
 (;W[nd]LB[ob:A][ne:B]C['a' is correct. 'b' is a mistake.]
 (;B[ob]
 ;W[oe]C[Doesn't work.]
 ;B[nc])
 (;B[ne]
 ;W[pb]
 ;B[ob]
 ;W[oc])))
 (;B[oj]C[Black 24 is sente.]
 ;W[]C[White plays elsewhere; a mistake.]
 ;B[rh]
 ;W[qi]
 ;B[qj]
 ;W[rj]
 ;B[rk]
 ;W[qk]
 ;B[sj]
 ;W[pj]
 ;B[si]
 ;W[qj]
 ;B[ql]))
 (;W[qj]C[White 24 eliminates the aji problem of the other variation, but gives Black additional thickness.]
 ;B[pj]
 ;W[qk]
 ;B[pk]LB[pl:b][ql:a]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[ql])
 (;W[pl]C[White 28 is an overplay.]
 ;B[ql]
 ;W[qm]
 ;B[rk]LB[rh:b][rj:B][rl:a]C[White 'a' and 'b' are both traumatic.]
 (;W[rl]
 ;B[qi]
 ;W[rh]
 ;B[rj])
 (;W[rj]
 ;B[rl]
 ;W[rh]
 ;B[qn]
 ;W[rm]
 ;B[pm]
 ;W[sk]
 ;B[ol]
 ;W[sl]
 ;B[pl]))))
 (;B[rj]C[Black 23 is not recommended, as it removes aji of Black sente (see the joseki variation).]
 ;W[rh]
 ;B[si]
 ;W[sf]
 ;B[nf]))
 (;W[ph]
 ;B[qh]
 ;W[pg]
 ;B[ng]
 ;W[oh]
 ;B[nh]))
 (;B[ph]
 ;W[rg]
 ;B[nf]))
 (;B[ng]C[Black 17 was invented by Abe against Tozawa in a preliminary round of the 1970 Nihon Ki-in Chamionship.]
 ;W[pg]C[Further resistence would be futile, so connecting at 18 is proper.]
 ;B[nh]LB[oe:b][nf:a]C[Tozawa played 'a', but 'b' looks like a missed opportunity.]
 (;W[nf]
 ;B[oe]
 ;W[rg]
 ;B[mf])
 (;W[oe]
 ;B[nf]
 ;W[pb]LB[oc:a][nd:b]C[Black continues with 'a' or 'b'.]
 (;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[rg]LB[nb:a]C[White 'a' is a good forcing move later.])
 (;B[nd]
 ;W[nc]
 ;B[od]
 ;W[md]
 ;B[rg]
 ;W[lc]C[The joseki concludes.]
 ;B[]
 ;W[qh]C[White tries to extract his stones.]
 ;B[rh]
 ;W[qi]
 ;B[ph]
 ;W[qg]
 ;B[qj]
 ;W[ri]
 ;B[rj])))))
 (;W[rg]
 ;B[se]
 ;W[rf]
 ;B[rc]
 ;W[nf]))
 (;B[rf]LB[rd:b][rg:a]C[Black 11 is a mistake.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]
 ;W[nf])
 (;W[rd]C[White 12 is a mistake.]
 ;B[of]C[Black is satisfied that White has let Black overcome the mistake of Black 11.])))
 (;W[qg]LB[qe:A][pf:B]C['a' is joseki, 'b' is an inferior variation.]
 (;B[qe]
 ;W[re]
 ;B[rf]LB[rd:A][rg:B]C['a' is joseki. 'b' is a mistake unless the corner is smaller than the right side.]
 (;W[rd]LB[pf:a][pg:b]C[Black continues with 'a' or 'b'. 'a' is joseki and builds the wall. After 'b', Black cannot stop White from entering the top by giving the right side.]
 (;B[pf]
 ;W[pg]
 ;B[og]LB[rg:A][oh:B]C['a' and 'b' are joseki.]
 (;W[rg]
 ;B[oh]C[
 * Joseki *])
 (;W[oh]
 ;B[ph]
 ;W[rg]
 ;B[ng]C[
 * Joseki *]))
 (;B[pg]LB[pb:b][pf:a]C[The combination of Black 11 and 13 was invented by Shimamura Toshihiro, first played against Takagawa Kaku in game 5 of the 1956 Honinbo title.
 White continues with 'a' to keep the right side or 'b' to enter the top side and give the right side.]
 (;W[pf]
 ;B[of]LB[rg:A][ph:B]C['a' is correct, 'b' is only possible with the ladder.]
 (;W[rg]
 ;B[og])
 (;W[ph]
 ;B[qh]
 ;W[og]
 ;B[rg]
 ;W[pg]
 ;B[ng]))
 (;W[pb]LB[ob:b][pf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pf]
 ;W[ob]
 ;B[rg])
 (;B[ob]C[Black 15 is a mistake.]
 ;W[pf]
 ;B[of]
 ;W[og]
 ;B[rg]
 ;W[qh]
 ;B[qb]
 ;W[ph]
 ;B[rh]
 ;W[qi]
 ;B[rb]
 ;W[ri]
 ;B[rc]
 ;W[nf]))))
 (;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]
 ;W[og]LB[pi:3]C[This is only good if Black 3 has now been severely damaged, such as with strong White support on the lower right.]))
 (;B[pf]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qb]
 ;B[ng]))
 (;W[rg]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qg]
 ;B[ng]C[
 * Joseki *])))
 (;W[of]LB[nc:C][nd:A][qe:B]C['a' is joseki, 'b' is possible.
 'c'  is not recommended.]
 (;B[nd]LB[qc:b][qd:c][rd:a]C[When Black has no extension at top.
 White continues with 'a' or 'b'.
 'c' is bad.
+]
 (;W[rd]
 ;B[qc]LB[ri:a][dp:b]C[White continues with 'a'. Playing elsewhere ('b') is a mistake.]
 (;W[ri]LB[jc:a][mf:b]C[
 Catenaccio
 ------------
 Traditionally seen as joseki, but the result is often considered favorable for Black, because White is too low. The joseki is only okay if used to reduce a big moyo.
 Black plays 'a' if there is no extension, or 'b' if Black already has an extension at top.
 Catenaccio is Italian. It means "lock," and refers to the football strategy of putting all forces into defense to avoid opponents' goals.
+]
 (;B[jc]LB[ni:c][qi:a][dp:b]C[White continues with 'a'. 'b' shows the result of White playing elsewhere. White 'c' is not good.
+]
 (;W[qi]C[Continuation.
 The large knight's move is thin, so White 10 is worth devoting a move to.])
 (;W[]LB[pg:a][qg:b]C[Black continues at 'a' or 'b'.]
 (;B[pg]
 ;W[pf]LB[rh:a][rj:b]C[Black plays 'a' to block White from the lower right side, or 'b' to split White into two groups.]
 (;B[rh]C[Black aims to seal White off from the lower right side.]
 ;W[qh]
 ;B[qi]
 ;W[rg]
 ;B[rj]
 ;W[sh])
 (;B[rj]LB[rh:b][qj:a]C[Black aims to separate White into two groups.
 Fighting spirit dictates White continues with 'a'. White 'b' is painfully submissive.]
 (;W[qj]
 ;B[qi]
 ;W[rk]
 ;B[rh]
 ;W[sj]
 ;B[qg])
 (;W[rh]
 ;B[qj])))
 (;B[qg]
 ;W[rg]
 ;B[rf]LB[pg:a]C[Black 12 is a tesuji.
 White must decide how best to continue. White 'a' gives away the corner.]
 ;W[pg]
 ;B[qe]C[Black takes the corner.]))
 (;W[ni]
 ;B[pk]
 ;W[nk]
 ;B[pg]
 ;W[pf]LB[nh:A][rh:B]C[Black can now select to cut on 'a' or 'b'.
 ]))
 (;B[mf]C[Black plays 9 if there is already an extension as shown.]))
 (;W[]C[White cannot afford to play elsewhere.]
 ;B[pg]
 ;W[pf]
 ;B[qg]
 ;W[rg]C[White 11 is necessary, though submissive.]
 ;B[rh]
 ;W[rf]
 ;B[rc]
 ;W[mf]))
 (;W[qc]C[White 6 was invented by Kitani Minoru in 1956 (Kitani-Shimamura,1956 2nd Top Position Tournament league).]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[ob]
 ;B[pg]
 ;W[pf]
 ;B[rg]C[
 * Joseki *]
 ;W[ni]LB[nb:A]C[Because of the aji of the White outside group, the attachment of Black 'a' is not good.
 ])
 (;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[qe]
 ;W[rd]
 ;B[pe]
 ;W[re]
 ;B[pf]LB[of:4]C[Now White 4 is wasted.
 ]))
 (;B[qe]LB[rf:A][rg:B]
 (;W[rf]
 ;B[nd])
 (;W[rg]
 ;B[re]
 ;W[qj]))
 (;B[nc]C[
 If you know the follow-up, please email: kogo@waterfire.us.]))
 (;W[nc]LB[qc:B][oe:C][pf:A]C['a' is joseki. 'b' is possible.
 'c' is an easy variation.]
 (;B[pf]LB[qc:b][pg:a]C[White continues with 'a' or 'b'.]
 (;W[pg]C[White 6 is conventional.]
 ;B[of]LB[qc:A][qe:B][og:C]C['a' or 'b'. 'c' is a mistake.]
 (;W[qc]
 ;B[qe]
 ;W[pc]LB[rd:C][rf:A][og:B]C['a', 'b' or 'c'.]
 (;B[rf]LB[ob:b][lc:a]C[Black can later play 'a' in sente, aiming at an attack at 'b'.]
 ;W[qg]C[Later this move doesn't work.]
 ;B[rg]
 ;W[qh]
 ;B[qi]
 ;W[rh]
 ;B[ri]
 ;W[sg]
 ;B[og]
 ;W[re]
 ;B[rd]
 ;W[sf]
 ;B[qd])
 (;B[og])
 (;B[rd]
 ;W[kc]
 ;B[pl]))
 (;W[qe]LB[nd:B][qd:A]C['a' or 'b' are ok.]
 (;B[qd]LB[pe:B][og:A]C['a' or 'b'.]
 (;W[og]
 ;B[nd]
 ;W[md]LB[oc:B][ng:A]C['a' is correct, 'b' is disadvantageous.]
 (;B[ng]
 ;W[od]
 ;B[pe]
 ;W[qh]
 ;B[ne]LB[lc:A][nh:B]C['a' and 'b' are ok.
 This pattern was very popular in Korea in 90's]
 (;W[lc]
 ;B[qi]
 ;W[oh]LB[jc:B][kd:C][nj:A]C['a', 'b' or 'c' are ok.]
 (;B[nj]
 ;W[nh]
 ;B[mg]
 ;W[mi]
 ;B[ob]C[If necessary and sente, Black plays an extension to the lower right before this move.]
 ;W[ic]
 ;B[pm])
 (;B[jc]LB[jd:A][le:B]C['a' or 'b'.]
 (;W[jd]LB[mb:A][id:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[mb]
 ;W[mc]
 ;B[id]
 ;W[je]LB[kc:A][ie:B]C['a' or 'b' give a position which is not bad for either Black or White.]
 (;B[kc]
 ;W[kd]
 ;B[hc]
 ;W[mf]
 ;B[me]
 ;W[le]
 ;B[mg]
 ;W[lf]
 ;B[nf]
 ;W[oi]
 ;B[pk]LB[pb:A][mi:B]C['a' if White is in the lower right. 'b' if Black is in the lower right.]
 (;W[pb]
 ;B[mi]
 ;W[oj]LB[pl:B][qn:A]C['a' if White is in the lower right. 'b' if Black is in the lower right.]
 (;B[qn]
 ;W[ok]
 ;B[pl]
 ;W[mk]
 ;B[kh])
 (;B[pl]))
 (;W[mi]))
 (;B[ie]
 ;W[ic]
 ;B[hc]
 ;W[ib]
 ;B[jf]
 ;W[jb]
 ;B[kd]LB[kc:A][ke:B]C['a' is correct. 'b' is a mistake.]
 (;W[kc]
 ;B[ke])
 (;W[ke]
 ;B[le]
 ;W[kf]
 ;B[kg]
 ;W[lf]
 ;B[mf]
 ;W[lg]
 ;B[lh]
 ;W[kc]
 ;B[mg]
 ;W[ld]
 ;B[nj])))
 (;B[id]
 ;W[je]
 ;B[kc]
 ;W[kd]
 ;B[hc]
 ;W[oi]
 ;B[pk]
 ;W[pb]))
 (;W[le]LB[je:A][nj:B]C['a' is correct.
 'b' is ok, if Black can make an extension in sente on one of both sides to come back to the other one.]
 (;B[je]
 ;W[pb]
 ;B[mh]
 ;W[oi]
 ;B[pk]
 ;W[oj]
 ;B[pl]
 ;W[mj]
 ;B[kh])
 (;B[nj]
 ;W[nh]
 ;B[mg]
 ;W[mi]
 ;B[kg]
 ;W[je])))
 (;B[kd]
 ;W[kc]
 ;B[jd]
 ;W[ic]
 ;B[nj]
 ;W[nh]
 ;B[lg]
 ;W[mi]
 ;B[pm]))
 (;W[nh]
 ;B[mg]
 ;W[oi]LB[kc:B][mc:A]C['a' is correct. 'b' is disadvantageous.]
 (;B[mc]LB[lc:A][mh:B]C['a' and 'b' are both okay.]
 (;W[lc]
 ;B[mb]
 ;W[lb]LB[nb:A][ld:B]C['a' is correct. 'b' is not recommended.]
 (;B[nb]
 ;W[hc])
 (;B[ld]
 ;W[ma]
 ;B[nb]
 ;W[kd]
 ;B[me]
 ;W[hc]))
 (;W[mh]LB[lc:C][lg:B][lh:A]C['a' is correct. 'b' and 'c' are disadvantageous.]
 (;B[lh]LB[lg:A][li:B]C['a' is correct. 'b' is questionable.]
 (;W[lg]LB[kh:B][li:A]C['a' or 'b' are ok.]
 (;B[li]
 ;W[lc]
 ;B[mb]
 ;W[ld]
 ;B[nb]
 ;W[kg]
 ;B[ji]
 ;W[hd])
 (;B[kh]
 ;W[lc]
 ;B[mb]
 ;W[ld]
 ;B[nb]LB[hd:A][kg:B]C['a' is correct. 'b' is a mistake.]
 (;W[hd])
 (;W[kg]
 ;B[jh]
 ;W[jg]
 ;B[ig])))
 (;W[li]
 ;B[ki]
 ;W[lj]
 ;B[kh]))
 (;B[lg]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[ld]
 ;W[ma]
 ;B[nb]
 ;W[kd]
 ;B[me]
 ;W[hc])
 (;B[lc]
 ;W[lg])))
 (;B[kc]
 ;W[pl]
 ;B[ke]
 ;W[kb]C[Later, White makes a ko.]
 ;B[lb]
 ;W[lc]
 ;B[ld]
 ;W[mb])))
 (;B[oc]
 ;W[ne]
 ;B[od]
 ;W[ng]
 ;B[mc]
 ;W[ld]))
 (;W[pe]LB[od:B][oe:A]C['a' or 'b'.]
 (;B[oe]
 ;W[od]
 ;B[qg]
 ;W[rd]
 ;B[rc]
 ;W[re]
 ;B[qc]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[sf]
 ;B[ob])
 (;B[od]
 ;W[oe]
 ;B[nd]
 ;W[ne]
 ;B[md])))
 (;B[nd]LB[oc:C][md:A][qd:B]C['a' is correct, 'b' is a bit better for Black.
 'c' is not recommended.]
 (;W[md]
 ;B[oc]
 ;W[ne]
 ;B[od]
 ;W[rc]
 ;B[og]
 ;W[ic]
 ;B[kc]C[Later]
 ;W[kd]
 ;B[lc]
 ;W[jd]
 ;B[mc])
 (;W[qd]
 ;B[oc]
 ;W[qc]
 ;B[mc]TR[pi]C[The triangled stone stops White from enlarging his group, a difference from similar joseki.])
 (;W[oc]
 ;B[qd]
 ;W[od]
 ;B[pe]
 ;W[og]
 ;B[ng]
 ;W[qh]
 ;B[ld]
 ;W[md]
 ;B[le])))
 (;W[og]
 ;B[qe]
 ;W[qg]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[rf]
 ;W[rb]
 ;B[rg]LB[qh:A][ni:B]C[A and 'b' are miai.]))
 (;W[qc]LB[pc:A][qe:B]C[White 6 is a recent Korean innovation.
 Black can block at 'a' or at 'b'.]
 (;B[pc]LB[qd:B][pg:A]C['a' goes outside, 'b' takes the corner.]
 (;W[pg]
 ;B[qd]
 ;W[of]
 ;B[nd]
 ;W[ld])
 (;W[qd]LB[pe:a][qe:b]C[Black can simply connect at 'a', which gives White the chance to play a fast-paced fuseki. If Black wants to forestall that, he can also wedge at 'b'.]
 (;B[pe]
 ;W[qe]
 ;B[qg]LB[pb:b][jd:a][rg:c]C[White can now choose a fast-paced strategy at 'a'.
 'b' emphasises territory to the top, 'c' to the right. Both give simple results which are considered slack.]
 (;W[jd]
 ;B[rg]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[oc]C[White now has sente again and can continue his fast-paced strategy.])
 (;W[pb]
 ;B[ob]
 ;W[qb]LB[oc:B][rg:A]C['a' or 'b'.]
 (;B[rg]
 ;W[oc]
 ;B[pl])
 (;B[oc]
 ;W[jd]
 ;B[rg]))
 (;W[rg]
 ;B[rh]
 ;W[qh]
 ;B[pg]
 ;W[ri]
 ;B[ph]
 ;W[qi]
 ;B[kd]))
 (;B[qe]
 ;W[re]
 ;B[pe]LB[rf:a][qg:b][rg:c]C[White 'a', the connection, is the only choice. White 'b' gives away the corner, while White 'c' leads to a painfully low position.]
 (;W[rf]LB[pb:C][kc:B][jd:A]C['a' is joseki. 'b' shows a complicated continuation.
 Black 'c' presses the White corner.]
 (;B[jd]C[
 * Joseki *])
 (;B[kc]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qg]LB[ng:a][nh:b]C[Black 'a' is a calm play leading to an even exchange. Black 'b' is a mistake.]
 (;B[ng]
 ;W[nh]
 ;B[mg]
 ;W[mh]
 ;B[lg]
 ;W[nj]LB[lh:a][pl:b]C[Black builds considerable thickness in exhange for White territory with 'a'. Black 'b' is a tactic to complicate the situation and start a fight in the center of the board.]
 (;B[lh]
 ;W[pk])
 (;B[pl]))
 (;B[nh]
 ;W[ng]
 ;B[oi]
 ;W[of]C[Black has no defense against this powerful countertactic.]))
 (;B[pb]LB[qb:b][jd:a]C['a' disable Black to make a moyo on the top side, 'b' secures the corner and gives Black the choice.]
 (;W[jd]LB[rb:a][qg:b]C[Black 'a' takes away White's base. Black 'b' is not so good, as Black can't seal White in.]
 (;B[rb]LB[pg:b][ph:d][rh:a][ri:c]C['a', 'b' or 'd'.
 White 'c' leaves him with an inferior position.]
 (;W[rh]LB[qg:a][ri:b]C['a' is correct. 'b' is a mistake.]
 (;B[qg]
 ;W[qh]LB[pg:B][ph:A]C['a' or 'b'.]
 (;B[ph]
 ;W[qj]
 ;B[qi]
 ;W[ri]
 ;B[rg]
 ;W[sg]
 ;B[pg]
 ;W[pj]
 ;B[oj]
 ;W[ok]
 ;B[pk]
 ;W[nj]
 ;B[oi]
 ;W[qk]
 ;B[pl]
 ;W[ql]
 ;B[pm]
 ;W[qm]
 ;B[pn])
 (;B[pg]
 ;W[qj]
 ;B[rg]
 ;W[sg]
 ;B[ph]
 ;W[pj]
 ;B[qi]
 ;W[rj]
 ;B[ri]
 ;W[si]
 ;B[oj]
 ;W[ok]C[White can make good shape after 30.]))
 (;B[ri]
 ;W[ph]
 ;B[oh]
 ;W[qi]
 ;B[qj]
 ;W[qh]
 ;B[oi]
 ;W[rj]
 ;B[rk]
 ;W[si]
 ;B[qk]))
 (;W[pg]
 ;B[og]
 ;W[ph]
 ;B[oh]
 ;W[qi]
 ;B[qj]
 ;W[rh]
 ;B[ri]
 ;W[qh]
 ;B[pj]C[White is sealed in.])
 (;W[ri]
 ;B[qh]
 ;W[rh]
 ;B[qg]
 ;W[rg]
 ;B[qj]C[White's position on the second line is painfully low.])
 (;W[ph]LB[oh:A][qh:B]C['a' is correct. 'b' is a mistake.]
 (;B[oh]
 ;W[qh]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[rh]
 ;B[oi]
 ;W[pg]
 ;B[og])
 (;B[qh]
 ;W[pg]
 ;B[qg]
 ;W[qi]
 ;B[oh]
 ;W[og]
 ;B[ng]
 ;W[of])))
 (;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[qb]))
 (;W[qb]LB[kc:A][qg:B]C['a' makes a moyo on the top side, 'b' encloses to the right side.]
 (;B[kc]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qg]
 ;B[ng]
 ;W[nh]
 ;B[mg]
 ;W[mh]
 ;B[lg]
 ;W[nj])
 (;B[qg]
 ;W[jd]
 ;B[rg]))))
 (;W[qg]C[White 12 is not recommended.]
 ;B[rf]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]C[Black is satisfied to take the corner.])
 (;W[rg]C[White 12 is not recommended, as White is too low.]
 ;B[qg]
 ;W[rf]
 (;B[kc]C[White is forced to play on the second line three times, after which Black can play the ideal point of 15.
 But it's possible to meet it in pro games])
 (;B[pb]
 ;W[kc]
 ;B[qh]
 ;W[rb]C[Shikshin (B) vs Dinerchtein, 2012])))))
 (;B[qe]
 ;W[pc]
 (;B[qg]LB[qg:9]C[Black's shape is a bit overconcentrated, so Black 9 is maybe omitted.])
 (;B[od]C[Modern joseki]
 ;W[mc])
 (;B[rd]C[Bad aji inside, but sharp]))))
 (;B[qc]
 ;W[oe]
 ;B[od]
 ;W[nd]
 ;B[pf])
 (;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[me]))
 (;W[nd]
 ;B[pf]LB[qc:B][pg:A]C['a' and 'b' are joseki.]
 (;W[pg]
 ;B[of]
 ;W[qe]LB[od:A][qd:B]C['a' is joseki, 'b' is a disastrous mistake.]
 (;B[od]LB[rc:A][og:B]C['a' is joseki, 'b' is a mistake.]
 (;W[rc]
 ;B[og]
 ;W[qg]
 ;B[ni]C[
 * Joseki *])
 (;W[og]
 ;B[ng]LB[ng:11][og:10][oh:A][oi:B][pi:3]C[In the Tsuke-Nobi-joseki, White 3 occupies the shape-point of the White stones. So after White 11 White is pushed into the bad empty triangle shape on 'a'. If here he tried to resist on 'b', the result is worse.]
 (;W[oh])
 (;W[oi]
 ;B[oh]
 ;W[qh]
 ;B[qd]C[White has a small group. Black has anything else.])))
 (;B[qd]LB[nd:4]C[This is impossible after White 4.]
 ;W[pe]
 ;B[oe]
 ;W[od]))
 (;W[qc]
 ;B[pc]LB[qd:A][pg:B]C['a' is joseki to keep the corner. 'b' is an inferior variation to go outside.]
 (;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]
 ;B[jd]LB[pg:A]C[
 * Joseki *
 After the joseki, White can attack on A, but must choose the
 right time.]
 ;W[pg]
 ;B[og]
 ;W[of]
 ;B[qb]
 ;W[rb]
 ;B[ob]
 ;W[mc]
 ;B[ra]
 ;W[rc]
 ;B[nf]
 ;W[oe]
 ;B[nc])
 (;W[pg]
 ;B[qe]
 ;W[of]
 ;B[pe]
 ;W[og]
 ;B[rg])))
 (;W[qk]LB[qe:B][pf:A]C['a' is possible. 'b' is not recommended.]
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qe]
 ;B[qd]
 ;W[og]LB[ng:B][qh:A]C['a' is possible, 'b' is not recommended.]
 (;B[qh]
 ;W[qg]
 ;B[nd]
 ;W[mg]
 ;B[oj])
 (;B[ng]LB[qh:A][qi:B][ok:C]C['a' is correct. 'b' depends on a ladder. 'c' is an overplay.]
 (;W[qh]LB[nd:A][qi:B]C['a' is necessary. 'b' is a mistake.]
 (;B[nd]
 ;W[qi]LB[pi:3]C[Now Black 3 is just heavy.])
 (;B[qi]
 ;W[pe]
 ;B[oe]
 ;W[od]C[The cut works now,]))
 (;W[qi]LB[nd:A][qg:B][qh:C]C['a' is correct without the ladder. 'b' is best with the ladder. 'c' gives up the corner.]
 (;B[nd]
 ;W[qh])
 (;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rf]
 ;B[ph]LB[sg:B][oh:A]C['a' with the ladder leads to Black's destruction. If White doesn't have the ladder, he plays 'b' and connects, while Black gets overwhelming thickness.]
 (;W[oh])
 (;W[sg]
 ;B[rh]
 ;W[ri]
 ;B[oh]
 ;W[sh]))
 (;B[qh]
 ;W[qg]
 ;B[ri]
 ;W[pe]
 ;B[oe]
 ;W[od]))
 (;W[ok]LB[nd:A][qg:B][nh:C]C['a' is correct and creates much influence, 'b' depends on the
 ladder, 'c' is slow.]
 (;B[nd]LB[qh:B][oi:A][qi:C]C['a' connects the White stones, 'b' and 'c' don't.]
 (;W[oi]
 ;B[qh]
 ;W[qg]LB[oj:A][qj:B]C['a' tales influence, 'b' takes away the base of the White group.]
 (;B[oj]
 ;W[pj]
 ;B[oh]LB[ph:B][ni:A]C['a' or 'b'.]
 (;W[ni]
 ;B[ph]
 ;W[rh]
 ;B[nh]
 ;W[ri]
 ;B[qj]
 ;W[pk]
 ;B[qi]
 ;W[rj]
 ;B[mi]
 ;W[nj])
 (;W[ph]
 ;B[ni]
 ;W[qi]
 ;B[nk]))
 (;B[qj]))
 (;W[qh]
 ;B[qi]
 ;W[oi]
 ;B[oh]
 ;W[ph]
 ;B[nh]
 ;W[ri]
 ;B[rh]
 ;W[qg]
 ;B[rj]
 ;W[qj]
 ;B[si]
 ;W[pj]
 ;B[ri]
 ;W[rg]
 ;B[ni]
 ;W[oj]
 ;B[re]
 ;W[rk]
 ;B[pe]
 ;W[sk]
 ;B[rf])
 (;W[qi]
 ;B[qh]
 ;W[qg]
 ;B[ri]
 ;W[qj]
 ;B[ph]
 ;W[rh]
 ;B[rg]
 ;W[sh]
 ;B[sg]
 ;W[oh]
 ;B[oi]
 ;W[ni]
 ;B[nh]
 ;W[oj]
 ;B[si]
 ;W[rh]
 ;B[sh]
 ;W[pj]
 ;B[rh]
 ;W[rj]
 ;B[re]
 ;W[sj]
 ;B[rf]))
 (;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[ph]
 ;W[oh])
 (;B[nh]
 ;W[qh]LB[nd:A][qi:B]C['a' is correct, 'b' gives up the corner.]
 (;B[nd]
 ;W[qi])
 (;B[qi]
 ;W[pe]
 ;B[oe]
 ;W[od]
 ;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[nb]
 ;W[rb]
 ;B[rd]
 ;W[pc]
 ;B[rg]
 ;W[qg]
 ;B[rh]
 ;W[se]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[sc]
 ;B[sf]
 ;W[rc]
 ;B[sg]
 ;W[qc]
 ;B[se]
 ;W[ri])))))
 (;B[qe]
 ;W[pf]
 ;B[nd]
 ;W[ng])))
 (;B[pj]LB[nc:b][qc:a][nd:c][qh:d]C[Outdated
 -Space High Pincer = Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia
 -----------------------------------------------------------------------------
 Black may play this way with a san-ren-sei at top, in which case White may enter the corner at 'a'.
 The double approach moves of 'b' or 'c' and 'd' are also possible.
+]
 (;W[qc]LB[pc:a][qd:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]C[Black 5 is appropriate given Black support at top.]
 ;W[qd]
 ;B[pe]
 ;W[rg])
 (;B[qd]
 ;W[pc]
 ;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc]
 ;B[nd]
 ;W[mc]
 ;B[md]))
 (;W[nc]LB[nd:c][oe:b][pf:a]C[Best way to punish Black.
 Traditional joseki continues with Black 'a'. Black 'b' and 'c' may be playable as well.]
 (;B[pf]LB[qc:b][pg:a]C[White 'a' is traditional joseki. White 'b' is a new line of play.]
 (;W[pg]
 ;B[of]LB[qc:b][qd:a][qe:c][re:d]C[White continues with 'a' to 'd'.]
 (;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]LB[rd:a][rg:b]TR[qn]C[White continues with 'a' (rare)  or 'b']
 (;W[rd]LB[qc:b][qg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qg]
 ;W[rf]LB[oc:a][qh:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[oc]LB[nd:b][qh:a]C[Black 15 is the best way to keep White from connecting.
 White continues with 'a'. White 'b' is an overplay in the face of Black thickness.]
 (;W[qh]
 ;B[og]
 ;W[ph]LB[qi:a][ri:b]C[Black has influence, White territory. The result is considered equal.
 Black continues with an extension at top.
 Black can later exchange 'a' for 'b'.])
 (;W[nd]C[White 16 is a mistake. The two White stones are heavy in front of such Black thickness.]))
 (;B[qh]C[Black 15 is a mistake.]
 ;W[pc]C[White is connnected, and White's profit exceeds Black influence.]))
 (;B[qc]C[Black 13 is a mistake. White can even later cut at the X.]MA[pc]
 ;W[qg]
 ;B[og]
 ;W[rj]C[Black 3 has lost effectiveness.]))
 (;W[rg]TR[qn]C[White 12 is not recommended, except when there is an additional White stone on the triangled position.]
 ;B[qc]
 ;W[rd]
 ;B[og]
 ;W[ph]
 ;B[oh]C[Most professionals prefer White's position.
 White has sente, so he can extend on the top and make the wall useless.]
 ;AW[qn]
 ;W[pi]
 ;B[oi]
 ;W[qj]
 ;B[qk]C[This stone is wrong now.]
 ;W[pk]
 ;B[oj]
 ;W[ql]
 ;B[rk]
 ;W[rj]))
 (;W[qc]
 ;B[qe]
 ;W[pc]LB[lc:c][rf:a][og:b]C[Locally, Black continues with 'a' to 'c'. Black may also play elsewhere.]
 (;B[rf])
 (;B[og])
 (;B[lc]))
 (;W[qe]
 ;B[qd]LB[qh:a][oi:b]C[White continues with 'a' or 'b'.]
 (;W[qh]
 ;B[oc]
 ;W[nd]
 ;B[od]LB[jc:b][jd:c][ri:a]C[Black has follow-up moves at 'a' to 'c', but White should first extend on the top.]
 ;W[kd]C[White 14 is a likely continuation.])
 (;W[oi]
 ;B[oc]
 ;W[oj]
 ;B[pk]C[White still lacks settled shape.]))
 (;W[re]C[This gives the same result as variation 'a', but with a different order of moves.]
 ;B[qe]
 ;W[qd]
 ;B[pe]LB[qd:10][re:8]C[For the continuations see the variation where White 10 is played before White 8.]))
 (;W[qc]LB[pc:a][qe:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pc]
 ;W[qd]LB[pe:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rf]C[Black has imperfect thickness (the pincer is too far, and White 4 has considerable aji), while White has meager territory.])
 (;B[pe]
 ;W[qe]
 ;B[qg]
 ;W[jc]C[White may prefer a two-space extension instead of three, depending on the board position.]))
 (;B[qe]C[Black 7 is a mistake in direction.]
 ;W[pc]
 ;B[qg])))
 (;B[oe]LB[qc:A][of:B]C['a' or 'b'.]
 (;W[qc]
 ;B[qd]
 ;W[pc]LB[md:a][me:b]C[Just looking at the current position (tewari analysis), Black 5 would be better placed at the 'x'. Further, a White play at 'x' presents a problem for Black.
 Black continues with 'a'. Black 'b' is too mild.]MA[od]
 (;B[md]LB[mc:d][nd:b][od:a][rd:c]C[White continues with 'a' to 'd'.]
 (;W[od]LB[pe:a][pf:b][pg:B]C[Black continues with 'a', or, to create thickness in sente (by sacrifice), 'b'.]
 (;B[pe]LB[rd:a][ne:b]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[re]
 ;W[rc]LB[qe:b][pg:a]C[Black continues with 'a'. Black 'b' makes a bad shape.]
 (;B[pg]C[Black has thickness, keeping to the original strategy.])
 (;B[qe]C[Black 15 is a mistake. Black has bad shape.]
 ;W[ne]
 ;B[nd]
 ;W[oc]
 ;B[le]
 ;W[nf]
 ;B[pg]
 ;W[og]
 ;B[qg]))
 (;W[ne]C[White 12 displays an aggressive style.]
 ;B[nd]
 ;W[oc]LB[le:b][pg:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[pg]
 ;W[nf]LB[rc:b][le:a]C[The fight begins.
 Black continues with 'a'. Black 'b' is also seen in professional
 play.]
 (;B[le]
 ;W[nh]C[White 18 is a possible continuation. The fight continues from here.])
 (;B[rc]C[Black 17 is a greedy move.]
 ;W[rd]
 ;B[re]
 ;W[ld]
 ;B[mc]
 ;W[lc]
 ;B[me]
 ;W[mb]
 ;B[le]
 ;W[mg]
 ;B[sd]
 ;W[kb]
 ;B[kf]
 ;W[kh]
 ;B[if]))
 (;B[le]C[Black 15 is an overplay.]
 ;W[rd]
 ;B[pg]
 ;W[re]
 ;B[nf]C[White has undermined Black's position in sente. This is a White success.])))
 (;B[pg]C[Black 11 initiates a sacrifice sequence to build thickness in sente.]
 ;W[pe]
 ;B[nd]
 ;W[oc]
 ;B[pf]
 ;W[qe]
 ;B[qg]
 ;W[rg]
 ;B[rd]
 ;W[re]
 ;B[se]
 ;W[rf]
 ;B[rh]
 ;W[rc]))
 (;W[nd]
 ;B[ne]
 ;W[me]LB[mc:b][kd:a]C[Black continues with 'a' or 'b'.]
 (;B[kd]LB[ld:b][mf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mf]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[og]
 ;W[kf]
 ;B[id])
 (;W[ld]C[White 14 is a mistake.]
 ;B[le]
 ;W[mc]
 ;B[mf]
 ;W[ke]
 ;B[md]
 ;W[lc]C[White is not likely to have a large enough ko threat, so must submit.]
 ;B[id]))
 (;B[mc]
 ;W[mb]
 ;B[kd]
 ;W[le]
 ;B[lb]
 ;W[nb]
 ;B[jd]
 ;W[mg]
 ;B[og]))
 (;W[rd]C[White 10 leaves the shape at top unresolved.]
 ;B[re]
 ;W[rc]
 ;B[pg]LB[oc:d][nd:c][od:a][pe:b]C[This shows a position in a professional game between Rin Kaiho (Black) and Kobatashi Koichi (White).
 White could play 'a', forcing Black 'b', but that would preclude pushing at c and cutting. White may reserve further play locally.
 The possibility of Black 'd' remains, so there is a tradeoff to White playing elsewhere.])
 (;W[mc]C[White 10 is submissive, but may be acceptable from a whole-board perspective.]
 ;B[ld]LB[nd:a][od:b]C[Black's shape still has defects at 'a' and 'b' that White may exploit later.]))
 (;B[me]C[Black 9 is too mild; Black should press White.]))
 (;W[of]
 ;B[nf]
 ;W[og]LB[qc:A][qe:B]C['a' starts a fight, 'b' aims to build influence by pressing down White on the top side.]
 (;B[qc]
 ;W[ne]LB[nd:B][mf:A]C['a' is correct. 'b' is a mistake.]
 (;B[mf]
 ;W[me]
 ;B[lf]
 ;W[kd]
 ;B[ni])
 (;B[nd]
 ;W[me]
 ;B[md]
 ;W[ld]))
 (;B[qe]
 ;W[rf]
 ;B[md]
 ;W[lc]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[jd]
 ;W[kb]
 ;B[lf]
 ;W[ic]
 ;B[id]
 ;W[hc]
 ;B[hd]
 ;W[gc]
 ;B[fe])))
 (;B[nd]C[Black 5 is not traditional joseki, and so is best considered a special strategy, but may be playable with a Black position at the upper left.]
 ;W[md]
 ;B[ne]
 (;W[oc]LB[pc:a][pe:b]C[Black continues with 'a'. Black 'b' is not recommended, as it gives away too much territory.]
 (;B[pc]LB[jc:a][od:b][pg:c]C[White continues with 'a'. White 'b' and 'c' are not recommended.]
 (;W[jc]
 ;B[pf])
 (;W[od]C[Without support at top, White 10 is at best premature.]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[of]
 ;B[pg]C[White must now extend towards the top, but the aji of the two Black stones and the cutting point present problems for White.]MA[mc])
 (;W[pg]LB[mc:a][qe:b]C[White 10 is not recommended, as White is thin in two places.
 Black continues with a sacrifice play at 'a'. Black 'b' is weak.]
 (;B[mc]C[Black 11 is a sacrifice to build strength to attack the two White stones at right.]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[me]
 ;W[ld]
 ;B[od]
 ;W[nb]
 ;B[ob]
 ;W[ma]
 ;B[oh]C[White can only try to live underneath, giving Black great strength on the outside.])
 (;B[qe]LB[re:c][ng:a][oh:b]C[Black 11 allows White's splitting maneuver to work.
 White continues with 'a'. White 'b' is a bit slow, but puts more pressure on Black 3.
 White 'c' is not recommended as being too low, and giving Black influence unnecessarily.]
 (;W[ng])
 (;W[oh]C[White 12 is a bit slow, but may be effective given the whole board situation. White 12 puts a bit more pressure on Black 3 than jumping up from White 10.])
 (;W[re]C[White 12 is not recommended, even though White can easily live.]
 ;B[pf]LB[qd:a][rf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qd]
 ;B[pe]
 ;W[rg]C[Black cannot capture White 14.]
 ;B[og]
 ;W[ph]
 ;B[oh]
 ;W[pi]
 ;B[oi]
 ;W[qj]
 ;B[qk]
 ;W[pk]
 ;B[oj]
 ;W[rj]C[White 26 ends in White sente, as Black must do something about the cut of White 24.]
 ;B[ql]
 ;W[kc])
 (;W[rf]C[White 14 is cowardly.]
 ;B[rd]
 ;W[of]
 ;B[pe]
 ;W[og]C[White is at a significant disadvantage as Black torments White while making territory and influence.]
 ;B[mg]
 ;W[nh]
 ;B[nj]
 ;W[mh]
 ;B[me]
 ;W[ld]
 ;B[kf])))))
 (;B[pe]C[Black 9 leaves the corner open, which Black must then defend in gote.]
 ;W[qb]
 ;B[qc]
 ;W[rb]
 ;B[rc]
 ;W[pc]
 ;B[qd]
 ;W[ic]C[White 16 may also be played one line closer to White's stones.]
 ;B[oh]))
 (;W[qc]C[Best way for White]
 ;B[oc]
 ;W[qd]
 ;B[mc]TR[pj]C[Marked stone is in bad position])))
 (;W[nd]LB[ne:A][pf:B]C['a' or 'b' are okay.
+]
 (;B[ne]
 ;W[me]
 ;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[od]
 ;B[pf]
 ;W[pc]
 ;B[rc]
 ;W[rb]
 ;B[rd])
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qe]
 ;B[od]LB[rc:b][og:a]C[White continues with 'a', possibly 'b'.]
 (;W[og]C[White 10 pushes to the center so as not to give too much thickness.]
 ;B[qd]C[The only move.]
 ;W[mg]
 ;B[ng]
 ;W[nh]
 ;B[nf]
 ;W[oi])
 (;W[rc]C[White 10 is a classic move, but yields much thickness to Black.]
 ;B[og]LB[oh:B][ph:A]C['a' is correct, 'b' is questionable.]
 (;W[ph]
 ;B[oh]C[Black 3 and 13 are working well together.])
 (;W[oh]
 ;B[ph]
 ;W[qg]
 ;B[nh]
 ;W[oi]
 ;B[nj]
 ;W[pi]
 ;B[qi]
 ;W[qh]
 ;B[ni]
 ;W[qj]
 ;B[oj]
 ;W[ri]C[Black built a lot of thickness in sente.]))))
 (;W[qh]
 ;B[qe]
 ;W[pf]
 ;B[nc]
 ;W[rj]))
 (;B[oe]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
 Black 3 is an invention of Takemiya Masaki. The move only makes sense with a Black supporting stone as shown, as part of a moyo strategy.
+]
 ;W[qc]LB[pc:A][qd:B]C[White naturally takes profit.
 'a' and 'b' are both correct and build a wall to the top. After 'b', that wall is stronger.]
 (;B[pc]
 ;W[qd]
 ;B[pg]LB[pf:b][qg:a][dp:c]C[Black 7 continues moyo strategy. White continues with 'a' for territory or 'b' to provoke a fight.
 Tenuki 'c' is not recommended.]
 (;W[qg]
 ;B[ph])
 (;W[pf]
 ;B[of]
 ;W[og]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[rf]
 ;B[pi]C[While Black may have influence, White should not be at a disadvantage in the coming fight.])
 (;W[dp]
 ;B[qg]C[Black forces in sente.]
 ;W[rf]))
 (;B[qd]C[This move is recommended by Takemiya Masaki.]
 ;W[pc]LB[nc:A][oc:B]C['a' is correct. 'b' is a mistake and builds the wall to the wrong direction.]
 (;B[nc]LB[nb:A][rd:B]C['a' or 'b'. With 'b', White wants to lure Black into taking gote.]
 (;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]LB[qe:B][dp:A]C[Black takes sente by playing tenuki 'a' as the wall to the top is enough. In the rare case of no large strategic point on the board, Black can play 'b'.]
 (;B[dp])
 (;B[qe]))
 (;W[rd]
 ;B[re]
 ;W[rc]LB[oc:A][qe:B]C['a' to take sente. After 'b', Black ends up in gote.]
 (;B[oc]
 ;W[qe])
 (;B[qe]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc])))
 (;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe])))
 (;B[of]LB[nc:c][qc:a][rd:d][og:e][ph:b]C[
 High Knight's Cap = Takageima
 -------------------------------
 Black 3 is played with an extension at top, such as marked.
 White continues with 'a', 'b', 'e', or possibly 'd'.
 White 'c' is a trick play.
 ]MA[jc]
 (;W[qc]LB[pc:A][qd:B]C['a' is correct. 'b' is a mistake.]
 (;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[rg]
 ;B[je])
 (;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nb]
 ;B[mc]TR[jc]C[Black has not used the marked stone.]))
 (;W[ph]
 ;B[qe]
 ;W[pf]LB[oe:A][pe:B]C['a' is correct. 'b' is a mistake.]
 (;B[oe]
 ;W[qc]
 ;B[pc]
 ;W[re]
 ;B[qd]
 ;W[rd]
 ;B[rc])
 (;B[pe]
 ;W[og]
 ;B[nf]))
 (;W[nc]LB[qc:a][nd:e][oe:d][pe:c][qe:b]C[White 4 is a trick.
 Black 'a' is best. Black 'b' gives an equal result.
 Black 'c', 'd', and 'e' are mistakes.]
 (;B[qc]LB[md:a][ph:b]C[Regardless of White's next move, Black 'a' or 'b' are good follow-up moves.])
 (;B[qe]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[rf]
 ;W[rb]
 ;B[qg])
 (;B[pe]C[Black 5 is a mistake. If Black was worred about being overextended, the capping move of Black 3 was not a good idea.]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[oc]
 ;W[re])
 (;B[oe]C[Black 5 is the same mistake as the previous variation (c).]
 ;W[qc]
 ;B[pc]
 ;W[qd])
 (;B[nd]C[Black 5 is a mistake.]
 ;W[md]
 ;B[oc]
 ;W[ne]
 ;B[od]
 ;W[mc]
 ;B[ph]C[Black 11 is a possible continuation.]
 ;W[qh]CR[rd]C[White can also slide into the corner at the marked spot.]))
 (;W[rd]C[White slides to settle his shape.]
 ;B[qc]
 ;W[ph]
 ;B[je])
 (;W[og]
 ;B[ng]LB[pg:B][oh:A]C['a' is possible, 'b' is questionable.]
 (;W[oh]
 ;B[pf]
 ;W[qg]
 ;B[qe]
 ;W[qj])
 (;W[pg]
 ;B[nh]
 ;W[nf]
 ;B[oe]
 ;W[mf]
 ;B[md])))
 (;B[pg]C[
 Shoulder Hit = Kata-tsuki
 --------------------------
+]
 ;W[pf]
 ;B[of]LB[oe:A][og:B]C['a' or 'b'.]
 (;W[oe]
 ;B[pe]
 ;W[og]
 ;B[nf]
 ;W[ph]
 ;B[ng]
 ;W[qg]LB[nd:A][re:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[nd]
 ;W[rd])
 (;B[re]
 ;W[oc]LB[pc:B][od:A]C['a' or 'b'.]
 (;B[od]
 ;W[ne]
 ;B[nd]
 ;W[me]
 ;B[nc]
 ;W[nh])
 (;B[pc]
 ;W[od])))
 (;W[og]
 ;B[ph]
 ;W[oe]
 ;B[nf]
 ;W[pe]
 ;B[qd]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[ob]
 ;W[me]
 ;B[nb]
 ;W[oh]
 ;B[oi]
 ;W[mg]
 ;B[oj]
 ;W[mi]))
 (;B[jd]LB[nc:a][qc:c][md:b]C[White continues with 'a', 'b' or 'c'.]
 (;W[nc]LB[nd:A][pf:B]C['a' is ok, 'b' is old-fanhioned.
+]
 (;B[nd]LB[qc:A][md:B]C['a' or 'b'.
+]
 (;W[qc]
 ;B[oc]
 ;W[qd]
 ;B[mc])
 (;W[md]
 ;B[ne]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[od]
 ;W[mb]
 ;B[qc]
 ;W[pb]
 ;B[lc]
 ;W[mc]
 ;B[qe]))
 (;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rg]))
 (;W[md]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[qe]
 ;B[qd]LB[rd:b][pe:a]C[White continues with 'a' or the trick play of 'b'.]
 (;W[pe]
 ;B[oe]
 ;W[od]
 ;B[nd]
 ;W[oc]
 ;B[rd]
 ;W[qh]
 ;B[nc]LB[ob:a][pc:b]C[White continues with 'a', or the trick play at 'b'.]
 (;W[ob]
 ;B[nb]LB[qb:b][ne:a]C[White continues with 'a', sacrificing the three White corner stones, or 'b' to try to trick Black.]
 (;W[ne]
 ;B[nf]
 ;W[me]
 ;B[pb]
 ;W[mg]
 ;B[lc])
 (;W[qb]C[White 20 is a trick play.]
 ;B[rb]
 ;W[ra]LB[sb:b][me:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[me]LB[sb:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]
 ;B[pb]LB[pa:a][pc:b]C[White continues with 'a' or 'b'.]
 (;W[pa]
 ;B[pc]
 ;W[oa]
 ;B[na]
 ;W[qa]
 ;B[sb])
 (;W[pc]
 ;B[qc]
 ;W[pa]
 ;B[sc]
 ;W[re]
 ;B[na]
 ;W[oa]C[The corner can be regarded as seki, unless someone starts a ko by playing at the 1-1 point.
 Black sente and the Black hane at 23 makes this a favorable result for Black.]))
 (;W[sb]
 ;B[rc]
 ;W[re]
 ;B[sc]C[The ko is not important: the hane of Black 23 is sufficient profit, according to Yoshio Ishida.]))
 (;B[sb]C[Black 23 is a mistake; Black has been tricked.]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[lc]
 ;W[mg]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[pa]
 ;B[na]
 ;W[oa]
 ;B[sa]
 ;W[mc]
 ;B[qa]
 ;W[mb]
 ;B[pb]
 ;W[mf]C[White has great thickness, and Black is sealed in. This is a success for White.])))
 (;W[pc]LB[nb:c][qb:b][qc:a]C[White 18 is a trick play. Black continues with 'a'. Black 'b' and 'c' are mistakes.]
 (;B[qc]
 ;W[nb]
 ;B[mc]
 ;W[qb]
 ;B[rb]
 ;W[mb]
 ;B[lc]
 ;W[pb]
 ;B[ra]
 ;W[lb]
 ;B[kc]
 ;W[oa]LB[sc:b][mf:a]C[Black continues with 'a'. Black 'b' to save the corner stones looks necessary, but is not.]
 ;B[mf]
 ;W[sc]C[White 32 attempts to kill the Black corner stones.]
 ;B[re]
 ;W[rf]C[White must play 34 to prevent Black from playing there.]
 ;B[sb]
 ;W[se]
 ;B[rc]
 ;W[sd]
 ;B[sf]
 ;W[se]
 ;B[sd])
 (;B[qb]C[Black 19 is a mistake.]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[nb]
 ;W[mg]
 ;B[qc]
 ;W[mf]
 ;B[ob]LB[pc:18][jd:3]C[Black is worse off than in the result of the main variation, where White doesn't try the trick play move of 18 and Black connects to Black 3 with a stone at the marked location.]MA[lc])
 (;B[nb]C[Black 19 is a mistake.]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[qb]C[Black must fight a ko, which is a disadvantgeous result for Black.]
 ;W[pb]
 ;B[ra]
 ;W[qa]
 ;B[sb]
 ;W[sa])))
 (;W[rd]LB[rc:a][od:b]C[White 10 is a trick play.
 Black continues with 'a'. 'b' is a mistake.]
 (;B[rc]
 ;W[pe]
 ;B[oe]
 ;W[od]LB[re:b][qg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qg]LB[re:a][rg:b]C[White continues with 'a' or 'b'.]
 (;W[re]
 ;B[oc]LB[nd:b][qh:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qh]
 ;B[nd])
 (;W[nd]C[White 18 is a mistake.]
 ;B[rg]C[Black captures the 5 White stones.]))
 (;W[rg]
 ;B[qh]
 ;W[rh]LB[re:b][qi:a]C[Black continues with 'a' or 'b'.]
 (;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[re]LB[oc:a][nd:b]C[Black continues with 'a' to live in the corner, or 'b' for outside influence.]
 (;B[oc]C[Black for corner territory.]
 ;W[nd]LB[qb:b][rb:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rb]
 ;W[ng]C[White 26 starts a difficult fight for Black.]
 ;B[og]
 ;W[oh]C[A classic squeeze play.]
 ;B[nh]
 ;W[nf]
 ;B[ph]
 ;W[oi]LB[mb:a]C[Further, White 'a' is sente against the Black corner group.])
 (;B[qb]LB[pc:a]C[If Black plays 25 here, it leaves aji for White to play 'a' later and reduce Black to one eye.]
 ;W[pc]C[White can play 26 with support as shown.]
 ;B[qc]
 ;W[ob]
 ;B[pb]
 ;W[nb]LB[ra:a][sb:b]C['a' and 'b' are miai, and Black dies.]))
 (;B[nd]C[Black sacrifices the corner for influence.]
 ;W[oc]
 ;B[nc]
 ;W[qc]
 ;B[ob]
 ;W[pc]
 ;B[me]C[The result is considered clearly favorable for Black, as Black's thickness is superior to White's 20 points in the corner.]))
 (;B[re]
 ;W[rf]
 ;B[sd]
 ;W[qi]
 ;B[nd]LB[oc:a]C[With the White stone captured, White's extending to 'a' is fruitless.]
 ;W[og]
 ;B[me]C[Black gets a favorable result.])))
 (;B[re]C[Black 15 is a mistake.]
 ;W[qg]LB[oc:b][nd:a]C[Black may try 'a' or 'b'.]
 (;B[nd]
 ;W[oc]
 ;B[nc]
 ;W[qc])
 (;B[oc]
 ;W[nd]
 ;B[nc]
 ;W[mg]C[Black's three stones are trapped.])))
 (;B[od]C[Black 11 is weak. Black has tricked himself.]
 ;W[rc])))
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[pf]
 ;B[qe]
 ;W[re]
 ;B[rd]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[of]
 ;W[og]
 ;B[ng]
 ;W[ph]
 ;B[nf]
 ;W[nh]
 ;B[mh]
 ;W[ni]
 ;B[mi]
 ;W[nj]
 ;B[mj]
 ;W[nk]))
 (;B[]LB[nc:a][qc:c][qd:b][of:d][qj:e]C[
 Tenuki
 -------
 Black plays elsewhere.
 White continues with 'a' or 'd'. White 'b' is a trick. White
 'c' is also possible. 'e'.
+]
 (;W[nc]LB[oe:a][pf:c][cq:b]C[Black continues with 'a' or 'c'. 'b' shows Black playing elsewhere.]
 (;B[oe]
 ;W[qc]LB[md:B][qd:A]C['a' to take a side or 'b' for a center moyo.]
 (;B[qd]
 ;W[pc]
 ;B[md]LB[nd:B][od:A]C['a' is correct. 'b' is inferior.]
 (;W[od]
 ;B[pe]
 ;W[rd]
 ;B[re]
 ;W[rc]LB[qe:B][pg:A]C['a' is correct. 'b' is a mistake.]
 (;B[pg]LB[qe:B][qf:2][rf:A]C[Later, White activates White 2 on 'a', not on 'b'.]
 (;W[rf]
 ;B[qe]
 ;W[se]
 ;B[qg])
 (;W[qe]LB[qe:16][rf:A][qg:B]C[White 16 is wrong, because Black can make a border of his territory in sente unto the second line by sacrificing another stone on 'a'. 'b' is a mistake.]
 (;B[rf]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[se]
 ;B[pf]
 ;W[sf])
 (;B[qg]
 ;W[rf]
 ;B[rg])))
 (;B[qe]
 ;W[ne]
 ;B[nd]
 ;W[oc]
 ;B[le]
 ;W[nf]
 ;B[pg]
 ;W[og]
 ;B[pf]
 ;W[lg]))
 (;W[nd]
 ;B[ne]
 ;W[me]
 ;B[kd]
 ;W[mf]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[og]
 ;W[kf]
 ;B[hc]
 ;W[li]
 ;B[pj]))
 (;B[md]
 ;W[qd]
 ;B[pg]
 ;W[qg]
 ;B[ph]))
 (;B[]LB[qc:B][oe:A]C[Black plays elsewhere.
 'a' or 'b'.]
 (;W[oe]LB[oc:a][qc:b]C[A go proverb states: "in a symmetrical position, play in the center", but that is not the case here.
 Go Seigen insists Black 'a' is the best move. Black 'b' also
 gives life.]
 (;B[oc]LB[nb:a][od:b]C[White 'a' seals Black in. White 'b' results in an exchange, with Black getting out on the right.]
 (;W[nb]
 ;B[re]
 ;W[rf]
 ;B[od]
 ;W[nd]
 ;B[ob]C[
 If you know the follow-up, please email: kogo@waterfire.us.])
 (;W[od]
 ;B[qe]
 ;W[pc]
 ;B[qc]
 ;W[ob]
 ;B[rf]
 ;W[rg]
 ;B[qg]
 ;W[pf]
 ;B[rh]
 ;W[re]
 ;B[sg]
 ;W[rd]))
 (;B[qc]
 ;W[pb]LB[qb:b][qe:a]C[Black continues with 'a'. Black 'b' is less favorable.]
 (;B[qe]LB[re:A][rf:B]C['a' or 'b'.]
 (;W[re]
 ;B[pe]
 ;W[pf]
 ;B[rd]
 ;W[rf]
 ;B[pc]
 ;W[ob]
 ;B[qb])
 (;W[rf]
 ;B[qb]
 ;W[pc]
 ;B[od]
 ;W[nd]
 ;B[pe]
 ;W[pf]
 ;B[re]C[
 * Joseki *]
 ;W[rd]
 ;B[se]
 ;W[rb]
 ;B[ra]
 ;W[rc]
 ;B[qd]
 ;W[sc]
 ;B[sb]
 ;W[sa]
 ;B[qa]C[Black lives.]))
 (;B[qb]
 ;W[pc]
 ;B[re]
 ;W[qe]
 ;B[qd]
 ;W[rf]
 ;B[od]
 ;W[nd]
 ;B[pa]
 ;W[mb]
 ;B[sd]
 ;W[qa]LB[ra:B][rb:A]C['a' is correct and brings life, 'b' is wrong and leads to death.]
 (;B[rb]LB[oa:B][sf:A]C[Neither 'a' or 'b' kill.]
 (;W[sf]
 ;B[sc]C[
 * Joseki *])
 (;W[oa]
 ;B[ra]
 ;W[sf]
 ;B[rd]))
 (;B[ra]
 ;W[sb]
 ;B[rb]
 ;W[sf]
 ;B[sc]
 ;W[rd]))))
 (;W[qc]
 ;B[pf]
 ;W[pg]
 ;B[qe]))
 (;B[pf]
 ;W[pg]LB[qe:A][of:B]TR[pj]C['a' or, with an additional stone on the triangled position, 'b'.]
 (;B[qe]
 ;W[of]
 ;B[pe]
 ;W[qg]
 ;B[nd]
 ;W[md]
 ;B[ne]
 ;W[ob]
 ;B[pb]
 ;W[pc]
 ;B[qc]
 ;W[oc]LB[qb:a][kd:b]C[Black continues with 'a', possibly 'b'.]
 (;B[qb]C[White 19 is the obvious continuation for a solid base in the corner.]
 ;W[re]
 ;B[rd]
 ;W[jc])
 (;B[kd]C[Black 19 is feasible with support at the top left.]
 ;W[qb]
 ;B[rb]
 ;W[pa]
 ;B[rd]
 ;W[kc]C[White 24 is one possible continuation. White must play locally to settle the group.]
 ;B[jc]LB[kb:a][lc:b]C[White continues with 'a' or 'b'.]
 (;W[kb])
 (;W[lc])))
 (;AB[pj]
 ;B[of]LB[qc:B][qd:A]C['a' is correct, 'b' is inferior.]
 (;W[qd]
 ;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rg]
 ;B[qc]
 ;W[rd]LB[og:B][qh:A]C['a' or 'b'.
+]
 (;B[qh]
 ;W[qg]
 ;B[oc])
 (;B[og]
 ;W[ph]
 ;B[oh]
 ;W[pi]
 ;B[oi]
 ;W[qj]
 ;B[qk]
 ;W[pk]
 ;B[oj]
 ;W[rk]
 ;B[ql]
 ;W[rl]
 ;B[qm]
 ;W[rm]
 ;B[qn]
 ;W[jc]))
 (;W[qc]
 ;B[qe]
 ;W[pc]
 ;B[og]))))
 (;W[qd]C[White 3 is a trick play.]
 ;B[qc]LB[pc:B][rc:A]C['a' is correct, 'b' an overplay.]
 (;W[rc]
 ;B[pc]
 ;W[re]
 ;B[ld])
 (;W[pc]LB[qb:A][oc:B][od:D][qe:C]C['a' punishes the White overplay. 'b' and 'c' fail to do so. Black 'd' is a mistake.]
 (;B[qb]LB[pb:B][oc:C][rd:A]C['a', 'b' or 'c'.]
 (;W[rd]
 ;B[oc])
 (;W[pb]
 ;B[ob]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[qe])
 (;W[oc]
 ;B[od]
 ;W[nd]
 ;B[oe]
 ;W[mc]
 ;B[qe]))
 (;B[oc]
 ;W[pb]
 ;B[qe]
 ;W[rd]
 ;B[od]LB[ob:a][rc:b]C[White continues with 'a' or 'b'.]
 (;W[ob]
 ;B[re]
 ;W[rc]
 ;B[pf])
 (;W[rc]
 ;B[ob]
 ;W[qb]
 ;B[kc]))
 (;B[qe]C[Black 6 is not recommended. White gets good shape on top.]
 ;W[rd]
 ;B[od]
 ;W[qb]
 ;B[re]
 ;W[rc]
 ;B[pf]
 ;W[nc])
 (;B[od]C[Without supporting stones nearby, Black 6 is a mistake.]
 ;W[qb]
 ;B[rc]
 ;W[rd]
 ;B[pb]
 ;W[oc]
 ;B[rb]
 ;W[nc])))
 (;W[qc]LB[pc:b][qd:a]C[Black continues with 'a' or 'b'.]
 (;B[qd]
 ;W[pc]LB[oc:b][od:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[od]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qe]
 ;W[nc])
 (;B[oc]C[Black 6 is a mistake.]
 ;W[rc]LB[od:a][rd:b]C[White 7 is the only move.
 Black continues with 'a', but, given the initial overplay, the mistake of 'b' may be expected.]
 (;B[od]
 ;W[rd]C[White connects, and has no wasted stones.])
 (;B[rd]C[White 8 is a mistake.]
 ;W[od]LB[ob:c][nc:b][oe:a]C[Black continues with 'a'. 'b' and 'c' are mistakes.]
 (;B[oe]
 ;W[nd]
 ;B[pf]
 ;W[nc])
 (;B[nc]C[Black 10 is a mistake. White captures the three Black stones.]
 ;W[pe]
 ;B[rf]
 ;W[re]))))
 (;B[pc]C[Black plays 4 with support as shown.]
 ;W[qd]
 ;B[pe]
 ;W[qe]
 ;B[og]
 ;W[ph]C[The continuation from here depends upon strategic considerations.]))
 (;W[of]
 ;B[nd]
 ;W[mf]
 ;B[ld]
 ;W[pk])
 (;W[qj]
 ;B[ql]C[These variations are included as Hoshi-Tenuki-Nirensei variations.]))
 (;B[re]LB[nc:b][pc:c][qe:f][of:e][rf:d][pj:a]C[
 Low Knight's Move = Hikui Keima
 ----------------------------------
 White continues with 'a' to 'd'. White should be prepared for a fight with 'b' and 'c'.
 White 'e' is a special strategy, not recommended.
 White 'f' is a mistake.
+]
 (;W[pj]LB[of:B][pg:D][ph:C][qh:A]C['a', 'b', 'c' or 'd'.]
 (;B[qh]LB[rf:b][qj:a]C[White can emphasize the bottom right with 'a', or fight with 'b'.]
 (;W[qj]
 ;B[of])
 (;W[rf]))
 (;B[of])
 (;B[ph]LB[nc:C][of:B][rf:A][qh:D]C['a' takes territory in the corner.
 'b' creates influence to the top side.
 'c' takes small territories on both sides.
 'd' is a disadvantageous way to build territory on the right side.]
 (;W[rf]LB[pf:B][rh:A]C['a' is correct. 'b' is disadvantageous.]
 (;B[rh]
 ;W[of]
 ;B[nh]
 ;W[qd]
 ;B[qc]
 ;W[qe]LB[pc:B][rc:A]C['a' or 'b'.]
 (;B[rc]
 ;W[nd]
 ;B[ne]LB[pc:B][me:A]C['a' is correct. 'b' is a mistake.]
 (;W[me]
 ;B[nf]
 ;W[pc]
 ;B[od]
 ;W[pb]
 ;B[nc]
 ;W[rb]
 ;B[qb]
 ;W[qa])
 (;W[pc]
 ;B[pb]
 ;W[oc]
 ;B[oe]
 ;W[ob]
 ;B[qa]
 ;W[rd]
 ;B[rb]))
 (;B[pc]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[sc]
 ;B[ra]
 ;W[qb]
 ;B[pb]
 ;W[mf]
 ;B[md]
 ;W[kf]
 ;B[mj]))
 (;B[pf]
 ;W[qe]
 ;B[pe]
 ;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[ra]))
 (;W[of]LB[rf:A][nh:B]C['a' or, with an additional stone on the top, 'b'.]
 (;B[rf]LB[od:A][oh:B]C['a' is correct, 'b' is only possible with additional strength in the lower right.]
 (;W[od]
 ;B[oc]
 ;W[pc]
 ;B[pb]
 ;W[qc]
 ;B[qd]LB[ob:B][nc:C][nd:A]C['a' is correct, 'b' and 'c' are disadvantageous.]
 (;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[rc]
 ;W[ld])
 (;W[ob]
 ;B[nc]
 ;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[qg])
 (;W[nc]
 ;B[ob]
 ;W[nd]
 ;B[qg]
 ;W[nb]
 ;B[qb]
 ;W[jc]))
 (;W[oh]
 ;B[oi]
 ;W[pi]
 ;B[qh]LB[nh:A][ni:B]C[If 'a', White gets two weak groups. If 'b', Black gets a huge territory.]
 (;W[nh]
 ;B[ni]
 ;W[ok]
 ;B[mi]
 ;W[lg]
 ;B[ki])
 (;W[ni]
 ;B[og]
 ;W[oj]
 ;B[ng])))
 (;AB[ic]
 ;B[nh]
 ;W[qh]
 ;B[pg]
 ;W[qg]
 ;B[pf]
 ;W[qe]
 ;B[pe]
 ;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[pb]))
 (;W[nc]
 ;B[oc]
 ;W[nd]
 ;B[pf]
 ;W[pg]
 ;B[og]
 ;W[qg]
 ;B[qe]
 ;W[qh]
 ;B[oh]
 ;W[qj]
 ;B[ri]
 ;W[qi]
 ;B[of]
 ;W[jc])
 (;W[qh]
 ;B[pg]
 ;W[qg]
 ;B[pf]
 ;W[qe]
 ;B[qd]
 ;W[pe]
 ;B[oe]
 ;W[pi]
 ;B[nf]))
 (;B[pg]LB[pf:A][rf:C][qg:B]C['a', 'b' and 'c' are disadvantageous.]
 (;W[pf]LB[of:B][qg:A]C['a' is correct. 'b' is disadvantageous.]
 (;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[of]
 ;B[og]LB[rd:A][nf:B]C['a' takes small territory. 'b' a large influence to the top in sente.]
 (;W[rd]
 ;B[nf])
 (;W[nf]
 ;B[sf]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[nd]
 ;W[md]
 ;B[oe]
 ;W[ne]
 ;B[od]
 ;W[mc]LB[ob:A][dp:B]C['a' is necessary, tenuki 'b' is bad.]
 (;B[ob])
 (;B[dp]
 ;W[ob]LB[pb:B][qc:A]C['a' is possible, 'b' is not.]
 (;B[qc]
 ;W[pb]LB[qb:A][co:B]C['a' is honte. Tenuki 'b' is not recommended.]
 (;B[qb])
 (;B[co]
 ;W[rd]LB[rc:B][qe:A]C['a' or 'b'.]
 (;B[qe]
 ;W[rc]LB[qb:A][rb:B]C['a' loses less than 'b'.]
 (;B[qb]
 ;W[rb]LB[qa:B][qd:A]C['a' saves stones, 'b' loses stones.]
 (;B[qd]
 ;W[qa])
 (;B[qa]
 ;W[qd]
 ;B[pe]
 ;W[pc]
 ;B[se]
 ;W[sd]
 ;B[sg]))
 (;B[rb]
 ;W[qb]
 ;B[sb]
 ;W[qd]
 ;B[sd]
 ;W[pc]))
 (;B[rc]
 ;W[qe]
 ;B[se]
 ;W[sd]
 ;B[sg]
 ;W[qd])))
 (;B[pb]
 ;W[qd]LB[rd:B][qe:A]
 (;B[qe]
 ;W[pe]
 ;B[pc]
 ;W[rd]
 ;B[se]
 ;W[sd]
 ;B[sg]
 ;W[qb]LB[pa:B][nb:A]C[Neither 'a' nor 'b' help.]
 (;B[nb]
 ;W[pa]
 ;B[oa]
 ;W[qa]
 ;B[mb]
 ;W[lb])
 (;B[pa]
 ;W[qc]
 ;B[nb]
 ;W[mb]
 ;B[oa]
 ;W[qa]
 ;B[rb]
 ;W[ma]
 ;B[sc]
 ;W[na]
 ;B[ra]
 ;W[ob]))
 (;B[rd]
 ;W[qc]LB[rc:B][qe:A]
 (;B[qe]
 ;W[pe]
 ;B[pc]
 ;W[qb])
 (;B[rc]
 ;W[qb]))))))
 (;B[of]LB[oe:C][og:B][qg:A]C['a' is correct, 'b' is disadvantageous, 'c' is a mistake.]
 (;W[qg]
 ;B[og]
 ;W[qi]
 ;B[oe]
 ;W[ql])
 (;W[og]
 ;B[qg]
 ;W[rg]
 ;B[oh]
 ;W[ng]
 ;B[rf]
 ;W[oe]
 ;B[ph])
 (;W[oe]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[pe]
 ;B[sf])))
 (;W[qg]
 ;B[pf]
 ;W[qe]
 ;B[qd]
 ;W[pe]
 ;B[oe]
 ;W[qh])
 (;W[rf]
 ;B[pf]
 ;W[qe]
 ;B[pe]LB[qd:B][rd:A]C['a' is correct. 'b' provokes a big Black wall.]
 (;W[rd]
 ;B[rc]
 ;W[qi])
 (;W[qd]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[rd]
 ;W[ra]
 ;B[rg]
 ;W[sd]
 ;B[qg]
 ;W[se]))))
 (;W[nc]
 ;B[oc]
 ;W[nd]
 ;B[of]C[Fighting erupts. Continuation depends on overall board position.]
 ;W[pe]C[White 8 shows toughness.]
 ;B[oe]
 ;W[od]
 ;B[pc]LB[qd:a][og:b]C[White 'a' and 'b' are possibilities.]
 (;W[qd]
 ;B[qe]
 ;W[pf]
 ;B[og]LB[rd:b][rf:a]C[White 'a' and 'b' are possibilities.]
 (;W[rf]
 ;B[rd]
 ;W[qi]
 ;B[oi])
 (;W[rd]
 ;B[rf]
 ;W[qb]
 ;B[qg]
 ;W[ob]))
 (;W[og]
 ;B[ng]
 ;W[qd]LB[qc:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[pf]
 ;B[pg]
 ;W[rf]
 ;B[rd]
 ;W[oh]
 ;B[nf]
 ;W[nh]
 ;B[mg]
 ;W[qh])
 (;B[qc]C[The additional stones are from the professional game where this variation arose: 1973 Pro Best Ten: Takagawa (White) versus Cho Chikun (Black).]
 ;W[rd]
 ;B[rc]
 ;W[pg]
 ;B[qe]
 ;W[nf]
 ;B[pf]
 ;W[ne]
 ;B[pe]
 ;W[nh]
 ;B[mg]
 ;W[li]
 ;B[mh]
 ;W[mi]
 ;B[oh]
 ;W[ni]
 ;B[ph]
 ;W[qg]
 ;B[qh]
 ;W[lh]
 ;B[rg]
 ;W[lg]
 ;B[rf])))
 (;W[pc]LB[oc:b][qc:a]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[oc]LB[qb:b][od:a]C[Black 'a' is preferable to 'b'.]
 (;B[od]
 ;W[nc]
 ;B[qb]
 ;W[nd]
 ;B[of]
 ;W[jd])
 (;B[qb]
 ;W[od]
 ;B[pe]
 ;W[kd]))
 (;B[oc]
 ;W[qd]
 ;B[qe]
 ;W[od]LB[qc:b][pe:a]C[Black continues with 'a' or 'b'.]
 (;B[pe]
 ;W[nc]
 ;B[qc]
 ;W[pb]LB[qb:b][oe:a]C[Black continues with 'a'. Black 'b' is not as favorable.]
 (;B[oe]
 ;W[nd])
 (;B[qb]
 ;W[ob]LB[ne:b][oe:a]C[Now Black 'a', White 'b', not as favorable for Black as the other variation.]))
 (;B[qc]
 ;W[pe]
 ;B[rd]
 ;W[pd]
 ;B[qb]
 ;W[nc]
 ;B[pf])))
 (;W[rf]LB[qe:B][qi:A]C[White 4 was played by Fujisawa Shuko = Fujisawa Hideyuki against Kato Masao in game 4 of the 1978 Kisei Title.
 'a' with support in the lower right, or 'b'.
+]
 (;B[qi]
 ;W[qd]
 ;B[qc]
 ;W[qe]LB[pc:B][rc:A]C['a' or 'b' are joseki, 'a' takes the corner.
+]
 (;B[rc]LB[od:A][of:B]C['a' is joseki, 'b' is too afraid.
+]
 (;W[od]LB[pc:A][pe:B]C['a' is correct. 'b' is a mistake.
+]
 (;B[pc]
 ;W[of]
 ;B[pe]
 ;W[ng])
 (;B[pe]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[oe]
 ;W[nd]
 ;B[ob]
 ;W[nf]
 ;B[ne]
 ;W[me]
 ;B[md]
 ;W[nc]))
 (;W[of]
 ;B[nd]))
 (;B[pc]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[sc]
 ;B[ra]
 ;W[qb]
 ;B[pb]
 ;W[of]))
 (;B[qe]
 ;W[pf]
 ;B[nd]
 ;W[qj]))
 (;W[of]C[White 4 gives away much profit, but breaks up the center.]
 ;B[nd]
 ;W[mf]LB[kf:b][rf:a]C[Black continues with 'a' to solidify the corner position. Black 'b' is premature.]
 (;B[rf]LB[kf:b][qg:a]C[White continues with 'a' or 'b'.]
 (;W[qg]
 ;B[kf]
 ;W[qd]
 ;B[qe]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[qc])
 (;W[kf]
 ;B[if]
 ;W[qg]))
 (;B[kf]C[Black 7 is premature.]
 ;W[qd]
 ;B[qe]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[qc]
 ;W[rf]
 ;B[rd]
 ;W[nj]))
 (;W[qe]C[White 4 is a mistake, giving Black solid territory.]
 ;B[qd]
 ;W[rf]
 ;B[rd]
 ;W[pj]C[White may extend nearby 8 (instead of White 8).]
 ;B[md]C[Black may also play above Black 9, at n17.]))
 (;B[qc]C[
 -3 = San-san
 ---------
+]
 ;W[of]
 ;B[md]
 ;W[pj])
 (;B[rf]LB[qe:B][re:A]C['a' is tricky. 'b' is the right defense.]
 (;W[re]
 ;B[qe]
 ;W[rg]
 (;B[rd]C[Wrong timing.]
 ;W[sf])
 (;B[pf]
 ;W[qg]
 ;B[rd]
 ;W[sf]C[Slightly better result for Black.]))
 (;W[qe]
 ;B[qd]
 ;W[re]
 ;B[rd]
 (;W[se]C[Too passive.]
 ;B[mc])
 (;W[qi]C[Correct.])))
 (;B[qe]C[This variation is included in two other branches:
 . as Hoshi (r11) variation for White corner invasions after White made a base, and
 . as Hoshi-Tenuki-Sanrensei variation for White on the run.
+]
 ;W[pf]
 (;B[pi]
 ;W[od]
 ;B[oc]
 ;W[nd]
 (;B[pe]C[Correct answer]
 ;W[of]
 ;B[pc]
 ;W[mg]
 ;B[mc]C[Joseki])
 (;B[nc]C[Mistake]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[pe]
 ;B[qd]
 ;W[mc]
 ;B[ob]
 ;W[nb]
 ;B[pa]
 ;W[ld]C[White's wall is really good, so White is favorable]))
 (;B[nd]
 ;W[pj]C[Joseki]
 ;B[qh]C[Invented by Lee Changho. It helps defend the corner in sente.]
 ;W[ph]
 ;B[rf]
 ;W[rg]
 ;B[re]
 ;W[qg]C[Korean joseki])))
 (;W[pf]LB[nd:a][qf:f][ph:c][qh:d][pj:b][qj:g][dp:e]C[
 -Space High Approach = Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaojia
 ------------------------------------------------------------------------------
 Black typically responds at 'a' or 'g'. Black 'b' is played when Black finds play on the right side advantageous. Black 'c' or 'd' may be played when Black has support at top.
 Black 'e' shows White follow-up if Black plays elsewhere.
 Black 'f' makes territory like 'a', but forgets to care for additional influence which is created by 'a'.
 f6, e5, d4, c3, b2, a1
+]
 (;B[nd]LB[lc:e][qc:b][qd:a][pj:c][qj:d]C[
 -Space Jump = Ikken Tobi = Hankan Ddwim = Yi Tiao`
 ----------------------------------------------------
 White continues with 'a'. White 'b' to 'e' are not recommended.
+]
 (;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]
 ;W[qj]
 ;B[jc]C[
 * Joseki *])
 (;W[qc]C[White 4 contradicts the strategy of enphasizing the center with the high approach move.]
 ;B[qd]LB[pb:A][rd:B]C['a' is correct. 'b' is questionable.]
 (;W[pb]LB[nb:A][rc:B]C['a' leaves a possibility to kill White, 'b' doesn't.]
 (;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]LB[nc:A][sd:B]C[Later, Black 'a' is a threat to kill, Black 'b' kills if Black has the ladder.]
 (;B[nc]
 ;W[ob])
 (;B[sd]
 ;W[rb]
 ;B[qa]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[nc]LB[mc:A][oc:B]
 (;B[mc]
 ;W[oc]
 ;B[mb]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[md]
 ;W[pe]
 ;B[of]
 ;W[pg]
 ;B[qe]
 ;W[nf])
 (;B[oc]
 ;W[mc]
 ;B[mb]
 ;W[na]
 ;B[ma]
 ;W[qb]
 ;B[na]
 ;W[lb])))
 (;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[sb]))
 (;W[rd]LB[pc:A][re:B]C['a' attempts to attack White, 'b' just lets him settle himself.]
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[pb]
 ;W[qe]
 ;B[rf]C[And Black attacks White's weakness.]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[re]
 ;W[rh]
 ;B[ra])
 (;B[re]
 ;W[rc]
 ;B[qf]
 ;W[ob])))
 (;W[pj]C[White 4 prior to taking part of the corner is not recommended.]
 ;B[qf]C[Black solidifies the corner.]
 ;W[qg]
 ;B[qe])
 (;W[qj]
 ;B[jc]LB[rd:A][qf:B]C[Later White 'a' or Black 'b'.]
 (;W[rd]
 ;B[qe]
 ;W[qf]
 ;B[re]
 ;W[rf]LB[rc:A][se:B]C['a' is easier than 'b'.]
 (;B[rc]
 ;W[se]
 ;B[qd])
 (;B[se]
 ;W[oc]))
 (;B[qf]
 ;W[qg]
 ;B[qe]))
 (;W[lc]
 ;B[me]LB[jd:A][qj:B]C['a' or 'b'.]
 (;W[jd]
 ;B[qj])
 (;W[qj]
 ;B[kd])))
 (;B[pj]C[
 -Space High Pincer = Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia
 -----------------------------------------------------------------------------
+]
 ;W[nd]LB[pc:b][qc:c][oe:a]C[Black responds with 'a' to 'c'.]
 (;B[oe]
 ;W[qc]LB[pc:b][qd:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qd]
 ;W[pc]
 ;B[of]
 ;W[od]LB[pe:b][pg:a]C[Black continues with 'a' or 'b'.]
 (;B[pg])
 (;B[pe]
 ;W[mf]))
 (;B[pc]C[Black 7 is the wrong direction.]
 ;W[qd]
 ;B[qe]
 ;W[pe]
 ;B[re]
 ;W[pb]
 ;B[ob]
 ;W[od]
 ;B[oc]
 ;W[nb]
 ;B[qb]
 ;W[nc]
 ;B[pa]
 ;W[nf]))
 (;B[pc]
 ;W[nf]
 ;B[nb])
 (;B[qc]))
 (;B[ph]C[
 -Space High Pincer = Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia
 ----------------------------------------------------------------------------
 This situation arises when Black has support at top.
+]
 ;W[qd]
 ;B[qc]
 ;W[pc]LB[qb:c][rc:d][od:a][pe:b]C[White must have the ladder to play this way (especially for d4).
 Black has various continuations.]
 (;B[od]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[sc])
 (;B[pe]
 ;W[rc]
 ;B[qb]
 ;W[rb]LB[pb:b][oc:a]C[Black continues at 'a' or 'b'.
 Black 'a' is more sensible, as Black yields the corner for thickness.]
 (;B[oc]
 ;W[pb]
 ;B[qe]
 ;W[rd]
 ;B[ob]
 ;W[qa])
 (;B[pb]C[Black crawls along the second line (the line of defeat).]
 ;W[oc]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[qe]))
 (;B[qb]
 ;W[od]
 ;B[pb]
 ;W[oc]
 ;B[rd]
 ;W[qe]
 ;B[ob])
 (;B[rc]C[White must have the ladder to play this way.]
 ;W[od]LB[pb:a]C[White 8 at 'a' does not work.]))
 (;B[qh]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 Black 3 was played by Kitani Minoru against Iwamoto Kaoru in game 3 of the 4th Honinbo title in November, 1947.
+]
 ;W[nd]
 ;B[pc]
 ;W[ph]
 ;B[qg]
 ;W[qf]
 ;B[pg]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[nc]
 ;W[ld]
 ;B[mc]
 ;W[kf])
 (;B[]LB[nd:a][ne:b]C[
 Tenuki
 -------
 Black plays elsewhere.
 White continues with 'a' or 'b'.
+]
 (;W[nd]LB[qc:A][qd:C][oe:B]C['a', 'b' or 'c'.]
 (;B[qc]
 ;W[nf]LB[oe:a][cq:b]C[Black continues locally with 'a', or plays elsewhere (b).]
 (;B[oe]C[White 6 aims to take more corner territory. Black cannot hope to break into the center.]
 ;W[of]
 ;B[ne]
 ;W[me]
 ;B[md]
 ;W[ld]
 ;B[mc]
 ;W[lc]
 ;B[nb]
 ;W[mb]
 ;B[nc]
 ;W[lf])
 (;B[]C[Black plays elsewhere again.]
 ;W[oc]LB[qf:b][rf:a]C[Black continues with 'a' or 'b'.
 Black 'a' risks abandoning the corner stones (White's choice).]
 (;B[rf]LB[qg:a][rg:b]C[White continues with 'a' or 'b'.]
 (;W[qg]C[White gains further influence.]
 ;B[rg]
 ;W[qe]
 ;B[re]
 ;W[qd]
 ;B[rd]
 ;W[pc]
 ;B[qb]
 ;W[qh])
 (;W[rg]C[White takes the corner.]
 ;B[qg]
 ;W[qf]
 ;B[rh]
 ;W[re]
 ;B[sg]
 ;W[qe]
 ;B[oh]))
 (;B[qf]
 ;W[qg]
 ;B[qe]
 ;W[rg]
 ;B[]C[Black plays elsewhere.]
 ;W[rd]C[White 11 is the vital point.]
 ;B[re]
 ;W[qb]
 ;B[rb]
 ;W[pb]
 ;B[ra])))
 (;B[oe]
 ;W[qc]
 ;B[pc]
 ;W[qd]LB[ne:B][of:A]C['a' is correct. 'b' is a mistake.]
 (;B[of]
 ;W[pg]
 ;B[kd])
 (;B[ne]
 ;W[md]))
 (;B[qd]
 ;W[nf]
 ;B[rf]))
 (;W[ne]
 ;B[nc]
 ;W[mc]
 ;B[mb]
 ;W[nb]LB[ob:a][nd:b]C[Black continues with 'a' to take the corner, or 'b' to get out to the center.]
 (;B[ob]
 ;W[nd]
 ;B[oc]
 ;W[lb]
 ;B[na]
 ;W[ld])
 (;B[nd]LB[ob:a][md:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[ob]
 ;B[pc]
 ;W[lc]
 ;B[md]
 ;W[kd]
 ;B[ke]
 ;W[je]
 ;B[kf])
 (;W[md]C[White 9 is unreasonable.]
 ;B[lb]
 ;W[pc]
 ;B[ob]
 ;W[od]
 ;B[oc]
 ;W[oe]
 ;B[qd]
 ;W[pb]
 ;B[na]
 ;W[rc]
 ;B[qc]
 ;W[qb]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[pa]
 ;W[sa]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[re]
 ;B[oa]
 ;W[sd]
 ;B[qa]
 ;W[qe]
 ;B[rb]
 ;W[qb]))))
 (;B[qf]LB[pe:c][qe:b][qg:a]C[
 Attach to Draw Back = Tsuke-Hiki
 -----------------------------------
 White continues with 'a'. With a favorable ladder to the lower left, White may consider 'b'.
 'c' is not recommended.
+]
 (;W[qg]
 ;B[qe]
 ;W[ph]
 ;B[nc]LB[qk:A][ql:B]C['a' or 'b'.]
 (;W[qk]LB[qf:3]C[Unlike Black 3 onto the squared position, Black has no strong continuations into the center.]MA[nd])
 (;W[ql]))
 (;W[qe]C[White must have the ladder to the lower left to play this way.]
 ;B[pe]
 ;W[qg]
 ;B[rf]
 ;W[rg]LB[of:a][pg:b]C[Black continues with 'a'. If White has a favorable ladder, Black 'b' is a mistake.]
 (;B[of]
 ;W[pg]
 ;B[re]
 ;W[pk]
 ;W[qc]C[Later, White may want to use the aji here, but there is none!]
 ;B[pc]LB[pb:A][qb:B][qd:C]C['a', 'b', 'c' don't work.]
 (;W[pb]
 ;B[ob]
 ;W[qd]
 ;B[rd]
 ;W[rc]
 ;B[rb]LB[qb:A][oc:B]
 (;W[qb]
 ;B[sc])
 (;W[oc]
 ;B[od]
 ;W[nb]
 ;B[nc]
 ;W[oa]
 ;B[qb]
 ;W[oc]
 ;B[mc]))
 (;W[qb]
 ;B[qd]
 ;W[pb]
 ;B[ob])
 (;W[qd]
 ;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[sd]))
 (;B[pg]C[If White has a favorable ladder to catch Black 9, Black 9 is a mistake. Otherwise, White 4 was a mistake.]
 ;W[of]
 ;B[re]
 ;W[ph]))
 (;W[pe]
 ;B[qe]
 ;W[od]
 ;B[oc]
 ;W[pc]
 ;B[qd]
 ;W[nc]
 ;B[ob]
 ;W[ne]
 ;B[nb]
 ;W[mc]
 ;B[pg]))
 (;B[qj]C[
 -Space Low Pincer = Sangen Basami = Sekan Hyeopgong = San Jia
 ---------------------------------------------------------------
+]
 ;W[nd]
 ;B[oe]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[of]LB[od:A][pg:B]C['a' is joseki, 'b' is more complicated.]
 (;W[od]
 ;B[pg]C[
 * Joseki *])
 (;W[pg]
 ;B[oi]
 ;W[od]
 ;B[pe]
 ;W[og]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[mi])))
 (;W[pg]LB[md:c][nd:a][qj:b]C[
 -Space High Approach = Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaojia
 -------------------------------------------------------------------------------
 White 2 is a light approach move. Rarely played in even games, White 2 is typically employed in handicap games.
 Black continues with 'a' or 'b'.
 In Korean Sunjang Baduk Black has a stone on 'c'.
+]
 (;B[nd]LB[qd:b][qk:a]C[
 -Space Jump = Ikken Tobi = Hankan Ddwim = Yi Tiao`
 ----------------------------------------------------
 White continues with 'a' or 'b'.
+]
 (;W[qk]
 ;B[jc]C[
 * Joseki *]
 ;W[qd]TR[jc][qk]C[The continuations are the same as without the marked extensions.])
 (;W[qd]LB[qc:a][qe:b]C[Black continues with 'a' or 'b'. Black 'a' gives a clear-cut division of territory: Black at top, White at right.
 Black 'b' offers White choices.]
 (;B[qc]LB[rc:c][pe:b][qe:a]C[White continues with 'a' to 'c'.]
 (;W[qe]
 ;B[rc]
 ;W[pe]
 ;B[od]
 ;W[qk]
 ;B[jc]C[
 * Joseki *])
 (;W[pe]
 ;B[od]
 ;W[re]LB[rc:A][rd:B][qf:C]C['a' is correct. 'b' is bad, because the aji at C is destroyed.]
 (;B[rc]
 ;W[qk]
 ;B[jc])
 (;B[rd]
 ;W[qe]
 ;B[rc]))
 (;W[rc]LB[pc:a][qe:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[qe]
 ;B[rb]
 ;W[qk]
 ;B[jc])
 (;B[qe]
 ;W[rd]
 ;B[pc]
 ;W[pe]LB[oe:b][pf:a]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[oe]
 ;B[qg]
 ;W[of]
 ;B[qf]
 ;W[ph]
 ;B[ri]
 ;W[od]
 ;B[oc]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[rb]C[Black's territory is superior to White's thickness.])
 (;B[oe]
 ;W[pf]
 ;B[rb]
 ;W[re]
 ;B[jc]))))
 (;B[qe]
 ;W[pe]LB[oe:e][re:a][pf:b][qf:c][rf:d]C[White 6 is a trick play.
 Black 'a' offers Black an advantage.
 Black 'b' makes White fight a ko for life in the corner.
 Black 'c' is a mistake, with Black taking the corner and White getting superior thickness.
 'd' gives White the choice, but is good for Black.
 'e' is possible.]
 (;B[re]LB[pc:c][qc:b][od:d][rd:a]C[White continues with 'a' to 'c'.
 White 'a' results in an ongoing fight. White takes the corner with 'b' or 'c', yielding superior thickness to Black.
 'd' is not recommended.]
 (;W[rd]C[White 8 is a fighting move.]
 ;B[rg]LB[pc:b][od:a]
 (;W[od]
 ;B[pc]
 ;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[qc])
 (;W[pc]C[White 10 is not recommended.]
 ;B[od]
 ;W[ob]
 ;B[nb]LB[rb:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[rb]
 ;B[pf]C[White 14 is correct shape.
 Being sealed in the corner is painful for White.])
 (;W[pf]LB[qc:A][qh:B]
 (;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[qa]
 ;B[oc]LB[rf:b][rh:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rh]
 ;B[qh]
 ;W[rf]
 ;B[ri]
 ;W[qf]
 ;B[pk])
 (;W[rf]C[White 22 is a mistake.]
 ;B[qf]
 ;W[qg]
 ;B[sf]
 ;W[rh]
 ;B[ri]
 ;W[sd]
 ;B[se]
 ;W[qh]
 ;B[sh]
 ;W[qj]
 ;B[sb]LB[sa:a]C[Black wins by one move.
 The ko at 'a' is easily dismissed as out of question.]
 ;W[sa]
 ;B[ra]
 ;W[dp]C[White make a threat elsewhere.]
 ;B[pa]C[Black takes.]))
 (;B[qh]
 ;W[rb]
 ;B[ph]))))
 (;W[qc]C[White takes the corner, giving Black thickness.]
 ;B[pc]
 ;W[pb]
 ;B[pf]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[ob]
 ;W[qb]
 ;B[nc]
 ;W[rd]
 ;B[qg]
 ;W[sb])
 (;W[pc]
 ;B[od]
 ;W[rc]
 ;B[pf]
 ;W[nb]
 ;B[mb]LB[ob:a][mc:b]C[White continues with 'a'. White 'b' concedes a large corner.]
 (;W[ob]LB[qb:B][mc:A]C['a' or 'b'.]
 (;B[mc]LB[rb:A]C[Later, Black reduces on 'a'.]
 ;B[rb]
 ;W[qb]
 ;B[rd]
 ;W[ra]
 ;B[qc]
 ;W[sb])
 (;B[qb]LB[rb:a][qc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rb]
 ;B[nc]
 ;W[qc]
 ;B[lc])
 (;W[qc]C[White 16 is a mistake.]
 ;B[mc]LB[rb:a][dp:b]C[Black 17 is still sente. White continues with 'a'. White playing elsewhere ('b') and Black can get a ko on the White corner stones.]
 (;W[rb])
 (;W[]C[White plays elsewhere; a mistake.]
 ;B[rb]
 ;W[sb]
 ;B[na]
 ;W[ra]C[A ko results.]))))
 (;W[mc]
 ;B[ob]
 ;W[lb]
 ;B[oc]))
 (;W[od]
 ;B[pc]
 ;W[oe]
 ;B[oc]
 ;W[qf]
 ;B[rd]))
 (;B[pf]C[Black 7 makes White fight a ko for life in the corner.]
 ;W[oe]
 ;B[od]
 ;W[of]
 ;B[qc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[sd]
 ;W[sa]
 ;B[rb]
 ;W[ra]
 ;B[se]
 ;W[pb]
 ;B[ob]
 ;W[oa]
 ;B[nb]
 ;W[sc])
 (;B[qf]C[Black 7 is a mistake. Black gets a sizable corner, but White has great thickness.]
 ;W[pf]
 ;B[qc]
 ;W[rd]
 ;B[rc]
 ;W[od]
 ;B[pc]
 ;W[qg]
 ;B[re]
 ;W[rf]
 ;B[sd]
 ;W[oc])
 (;B[rf]LB[pc:A][od:B]C['a' or 'b'.]
 (;W[pc]
 ;B[od]
 ;W[rd]
 ;B[qh])
 (;W[od]
 ;B[pc]
 ;W[oe]
 ;B[oc]
 ;W[qf]
 ;B[re]
 ;W[rg]
 ;B[rd]))
 (;B[oe]
 ;W[pf]
 ;B[qc]
 ;W[rd]
 ;B[pc]
 ;W[re]))))
 (;B[qj]LB[nc:a][md:c][nd:b][od:d]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 White continues with 'a' to 'd'.
+]
 (;W[nc]
 ;B[nd]
 ;W[md]
 ;B[ne]
 ;W[oc]
 ;B[pc]
 ;W[od]
 ;B[oe]
 ;W[pe]LB[pb:B][mc:A]C['a' and 'b' are joseki. 'a' gives a large corner for huge influence. 'b' gives White the choice to give the corner or the right side.]
 (;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[pb]
 ;B[qb]
 ;W[ob]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[qc]
 ;B[og]C[
 * Joseki *])
 (;B[pb]
 ;W[lc]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]LB[rc:B][of:A]C['a' and 'b' are joseki. 'a' takes outside influence for the
 corner. 'b' takes the top side for the right side, while the
 corner becomes seki.]
 (;W[of]
 ;B[ng]
 ;W[og]
 ;B[rd]
 ;W[mg]C[
 * Joseki *]
 ;B[se]
 ;W[nf]
 ;B[qd]LB[me:A]C[A is gote until the endgame for White and ever for Black.])
 (;W[rc]LB[rb:A][qc:B]C['a' is joseki, 'b' a mistake leading to a disaster.]
 (;B[rb]
 ;W[sb]
 ;B[og]C[
 * Joseki *]
 ;W[qb]
 ;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[sd]
 ;B[qa]
 ;W[ob]
 ;B[sf]
 ;W[se]C[The corner is seki, because if one side starts the ko, the ko is in favor of the other side.])
 (;B[qc]
 ;W[rd]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[of]
 ;B[nf]
 ;W[og]
 ;B[qh]
 ;W[mg]
 ;B[se]LB[sc:B][me:D][mf:A][ng:C]C[White cannot take the Black corner stones and must play on 'a' (or C or D) and not connect on 'b'.]
 (;W[mf]
 ;B[sd]
 ;W[me]
 ;B[sa]
 ;W[ng]
 ;B[sc]C[ Very bad for Black. Compare this White influence to the Black influence after the correct joseki,])
 (;W[sc]
 ;B[sa]
 ;W[ng]
 ;B[qd]
 ;W[mf]
 ;B[sd]C[White wanted too much and got less.])))))
 (;W[nd]
 ;B[oe]LB[ld:b][ne:c][ng:a]C[White continues with 'a'. White 'b' and 'c' are not recommended.]
 (;W[ng]
 ;B[ne]
 ;W[ld]
 ;B[me]LB[md:a][le:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[md]
 ;B[le]LB[kd:a][ke:b]C[White must extend with 'a'. The White hane of 'b' is unreasonable.]
 (;W[kd]
 ;B[oh]
 ;W[og]
 ;B[lg])
 (;W[ke]C[White 12 is unreasonable.]
 ;B[kd]
 ;W[jd]
 ;B[kc]
 ;W[jc]
 ;B[lb]
 ;W[jb]
 ;B[nc]))
 (;W[le]C[White 10 is unreasonable.]
 ;B[md]
 ;W[mc]
 ;B[lc]
 ;W[kc]
 ;B[lb]
 ;W[mb]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hc]LB[ob:a][nc:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ob]
 ;W[hb]C[White 24 is not sente.])
 (;B[nc]C[Black 23 is a mistake.]
 ;W[qc]C[White 24 is possible because of Black 23 (threatening to extend from 16).])))
 (;W[ld]C[White 6 is not recommended.]
 ;B[ne]
 ;W[me]
 ;B[ng]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[oj]C[Because White is high on both sides, White cannot slide into the corner or invade at the 3-3.])
 (;W[ne]C[White 6 is not recommended.]
 ;B[of]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[nf]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[nh]
 ;W[oj]
 ;B[ok]
 ;W[nk]
 ;B[ol]))
 (;W[md]LB[ne:A][dp:B]C['a' or tenuki 'b'.]
 (;B[ne]LB[nd:b][me:a]C[White continues with 'a' or 'b'.]
 (;W[me]
 ;B[nf]
 ;W[nd]
 ;B[od]
 ;W[pi]
 ;B[pj]
 ;W[oi]
 ;B[mf]LB[qf:A]C[Later, White continues on 'a'.]
 ;W[qf]
 ;B[qe])
 (;W[nd]
 ;B[oe]
 ;W[ng]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]LB[kd:12][ld:10][md:8][nd:4][pd:1][le:11][me:9][ne:7][oe:5][ng:6][pg:2][qj:3]C[For continuation, see the variation referenced by the numbers.]))
 (;B[dp]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[me]LB[ld:A][ne:B]C['a' is correct. 'b' is questionable.]
 (;W[ld]
 ;B[nf])
 (;W[ne]
 ;B[ld]
 ;W[mc]
 ;B[nf]
 ;W[oe]
 ;B[of]
 ;W[pe]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[rd]
 ;B[lf])))
 (;W[od]LB[oc:c][oe:b][pe:a]C[Black continues with 'a'. Black 'b' or 'c' are a mistake, as White cross-cuts, and has the advantage of the nearby stone.]
 (;B[pe]
 ;W[oe]
 ;B[oc]
 ;W[nc]
 ;B[pc]
 ;W[of]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[oj])
 (;B[oe]C[Black 5 is a mistake.]
 ;W[pe])
 (;B[oc]C[Black 5 is a mistake.]
 ;W[pc])))
 (;AW[dd][jd][dg][dm][pm][jp][pp]AB[gd][md][dj][pj][dp][gp][mp]LB[qd:A]C[
 Sunjang Baduk
 ----------------
 Opening position of the traditional Korean Sunjang Baduk.
 'a' is the only possibility for a joseki that doesn't sacrifice the outside stone by taking the corner.
 ]PL[W]
 ;W[qd]
 ;B[qc]LB[pe:A][qe:B]C['a' is correct, 'b' is not recommended.]
 (;W[pe]
 ;B[od]LB[rc:A][qe:B]C['a' is correct. 'b' is a mistake.]
 (;W[rc]LB[qb:B][rd:A]C['a' is correct, 'b' is too shy.]
 (;B[rd]
 ;W[qe]
 ;B[rb]
 ;W[ne]LB[nd:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;B[nd]
 ;W[re])
 (;B[re]
 ;W[pc]
 ;B[qb]
 ;W[nd]
 ;B[oc]
 ;W[nc]))
 (;B[qb]
 ;W[qe]))
 (;W[qe]
 ;B[rc]C[White has a target to be attacked, Black has many points.]))
 (;W[qe]
 ;B[pc]C[Now White cannot make an extension so he has no eye space.])))
 (;W[qg]LB[mc:A][qe:B]C[
 -Space Low Approach = Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~
 -----------------------------------------------------------------------
 Two of the answers for Black are 'a', which is joseki, and 'b'.
+]
 (;B[mc]LB[qc:B][qd:C][rd:A]C['a', 'b' or 'c'.]
 (;W[rd]
 ;B[qc]
 ;W[qj]LB[rf:A]C[
 * Joseki *
 Although this is considered as joseki, Black has an unpleasant follow-up on 'a'.]
 ;B[rf]LB[rd:4][qe:B][qf:A]C[White should answer on 'a'. Resistance on 'b' is futile, as White 4 is lost.]
 (;W[qf]
 ;B[re]
 ;W[qe]
 ;B[qd]
 ;W[rg]
 ;B[rc])
 (;W[qe]
 ;B[qf]
 ;W[pf]
 ;B[rg]
 ;W[qh]
 ;B[re]
 ;W[qd]
 ;B[pe]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[sd]
 ;W[sa]
 ;B[rb]
 ;W[ra]
 ;B[se]C[Black captures.]))
 (;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]TR[qg]C[Black has not captured the marked stone, so the position is good for white.])
 (;W[qd]
 ;B[qc]LB[pe:B][qe:A]C['a' or 'b'.]
 (;W[qe]
 ;B[pc])
 (;W[pe]
 ;B[od]
 ;W[re]
 ;B[rc])))
 (;B[qe]LB[mc:B][qj:A]C['a' is usual.
 'b' shows the Three Crows.]
 (;W[qj]
 ;B[nc]
 ;W[qc]
 ;B[pc]LB[rd:B][re:A]C['a' or 'b' are ok.]
 (;W[re]LB[rd:A][rf:B]C['a' is correct, 'b' loses the corner.
+]
 (;B[rd]
 ;W[rf]
 ;B[rc])
 (;B[rf]
 ;W[rd]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[qb]))
 (;W[rd]
 ;B[re]
 ;W[pb]LB[ob:A][rb:B]C['a' or 'b' lead to ko.]
 (;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa]
 ;B[qb])
 (;B[rb]
 ;W[qb]
 ;B[ob]
 ;W[ra]
 ;B[sb]
 ;W[se]
 ;B[rf]
 ;W[pa]
 ;B[rc])))
 (;W[mc]
 ;B[oc]C[Three crows.]
 ;W[qc]C[White can't kill.]
 ;B[ob]
 ;W[re]
 ;B[rd]
 ;W[qd]
 ;B[rc]
 ;W[pe]
 ;B[qf]
 ;W[rf]
 ;B[pf]
 ;W[qb]
 ;B[rb])))
 (;W[]LB[ic:i][jc:a][kc:h][lc:g][mc:b][nc:c][jd:d][nd:e][pp:f]C[
 Tenuki
 -------
 White plays elsewhere.
 Black continuations shown are 'a' to 'f'.
 'a' = 3-10 extension.
 'b' = large knight extension.
 'c' = small knight extension.
 'd' = high double wing formation.
 'e' is possible, but not joseki. 'e' is shown to illustrate White invasions.
 'f' demonstrates joseki in the ni-ren-sei and san-ren-sei fuseki.
 'g' and 'h' show the correct answer to a kakari with an additional Black stone there.
 'i' is far away for two low extensions.
 f6, e5, d4, c3, b2, a1
+]
 (;B[jc]LB[qf:b][cq:a]C[
 -Space Extension = Goken Biraki = Daseochkan Peollim = Chai Wu~
 -----------------------------------------------------------------
 White plays elsewhere 'a', or approaches at 'b'.
+]
 (;W[]LB[nd:a][pf:b][qf:d][qg:c][qj:e]TR[qh][qi]C[White plays elsewhere again.
 Black continues with 'a' or 'b'.
 Any second low extension from the hoshi is wrong:
 Invasions after 'c' or 'd', general way of punishment (also to be applied after a Black stone on one of the triangled points) after 'e' are shown.
+]
 (;B[nd]LB[qc:a][qd:b][qg:c]C[Black 5 is usually played when Black already has an extension
 at the top such as Black 2.
 White continues with 'a', 'b' or 'c' before entering the corner.]
 (;W[qc]
 ;B[qd]
 ;W[pb]LB[nb:A][pc:B]C['a' or 'b' are ok.]
 (;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]LB[qa:B][qf:A]C[The joseki ends.
 Later, 'a' is sente, 'b' a mistake.]
 (;B[qf]
 ;W[ob])
 (;B[qa]C[Black 13 can stop White from getting two eyes, but White cannot be captured without additional local Black supporting stones.]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[qb]LB[na:b][oc:a]C[Black continues with 'a', make Black 13 futile.
 Black 'b' is not recommended.]
 (;B[oc]
 ;W[na]
 ;B[ma])
 (;B[na]C[Black 19 is unreasonable; White breaks out.]
 ;W[nc]
 ;B[mc]
 ;W[oc]
 ;B[lb]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[md]
 ;W[pe]C[White breaks out.])))
 (;B[pc]
 ;W[rb]LB[ob:A][rc:B]C['a' is correct. 'b' is inferior and only makes sense if Black needs sente very much.]
 (;B[ob]
 ;W[rd]
 ;B[re]LB[qa:B][sc:A][sd:C]C[White lives on 'a' or 'b' or takes sente playing elsewhere leaving a ko in the corner which begins with Black 'c'.]
 (;W[sc])
 (;W[qa])
 (;B[sd]
 ;W[sc]))
 (;B[rc]
 ;W[qb]
 ;B[ob]
 ;W[rd]
 ;B[re]
 ;W[sc])))
 (;W[qd]
 ;B[qc]LB[pe:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[rc]
 ;W[pe]
 ;B[od]
 ;W[qh])
 (;W[pe]
 ;B[qe]
 ;W[rd]
 ;B[re]
 ;W[od]
 ;B[pc]
 ;W[pf]LB[oc:b][qg:a]C[Black continues with 'a' or 'b'.]
 (;B[qg]
 ;W[pg]
 ;B[qh]
 ;W[oc]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc])
 (;B[oc]
 ;W[rf]
 ;B[rc]
 ;W[qf]
 ;B[sd]
 ;W[qj])))
 (;AW[qj]
 ;W[qg]
 ;B[qe]
 ;W[qc]LB[pc:B][rd:A]C[Black tries to take all on 'a' or defends the top side on 'b'.]
 (;B[rd]LB[nb:A][lc:B])
 (;B[pc]LB[rd:A][re:B]C['a' creates a ko in the corner. 'b' reduces.]
 (;W[rd]
 ;B[re]
 ;W[pb]LB[ob:A][rb:B]C['a' is simple, 'b' makes the ko bigger.]
 (;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa]
 ;B[qb])
 (;B[rb]
 ;W[qb]
 ;B[ob]
 ;W[se]
 ;B[rf]
 ;W[ra]
 ;B[sb]
 ;W[pa]
 ;B[rc]
 ;W[qd]
 ;B[sd]
 ;W[sc]))
 (;W[re]LB[rd:A][rf:B]C[With 'a', White reduces the corner in sente and secure his group on the right.
 'b' lives in the corner.]
 (;B[rd]
 ;W[rf]
 ;B[rc])
 (;B[rf]
 ;W[rd]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[qb])))))
 (;B[pf]LB[pc:A][qc:B]C['a' or 'b'.]
 (;W[pc]
 ;B[oc]LB[ob:b][qc:c][qd:a]C[White continues with 'a', possibly 'b'. White 'c' is a mistake.]
 (;W[qd]LB[pe:a][qe:b]C[Black continues with 'a' to emphasize the top, or 'b' to emphasize the right side.]
 (;B[pe]C[Black 7 emphasizes the top.]
 ;W[qb]
 ;B[ob]
 ;W[rf])
 (;B[qe]C[Black 7 emphasizes the right side.]
 ;W[od]
 ;B[pe]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[qc]
 ;W[pb]
 ;B[mc]
 ;W[rd]
 ;B[rc]
 ;W[rb]
 ;B[re]
 ;W[qb]
 ;B[sd]
 ;W[mb]
 ;B[lc]))
 (;W[ob]
 ;B[qc]
 ;W[pb]
 ;B[nc]
 ;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[rc]
 ;W[od]
 ;B[pe]
 ;W[nb]
 ;B[mc]LB[ob:8][pb:10][qd:12]C[Same position as a variation of White 12 played before White 8 and 10.
+]
 ;W[rb]
 ;B[re]
 ;W[qb]
 ;B[sd]
 ;W[mb]
 ;B[lc])
 (;W[qc]C[White 6 is heavy, vulgar, and a bad play.]
 ;B[ob]
 ;W[re]
 ;B[rf]
 ;W[qe]
 ;B[qf]
 ;W[pe]
 ;B[oe]
 ;W[qd]LB[ra:b][od:a]C[Black plays 'a' to seal White in with great thickness, or 'b' to fight a ko to kill White's corner stones.]
 (;B[od]
 ;W[pb])
 (;B[ra]
 ;W[od]
 ;B[nd])))
 (;AB[qj]
 ;W[qc]
 ;B[pc]
 ;W[rd]
 ;B[rf]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qb]LB[nc:A][sc:B]C['a' is usual, 'b' drives White out.]
 (;B[nc]LB[nf:B][og:A]C[This move or 'a' or 'b' cut the possibility for White to run out.]
 ;W[re])
 (;B[sc]
 ;W[sb]
 ;B[sd]
 ;W[re]
 ;B[se]
 ;W[qf]
 ;B[qg]
 ;W[qe]
 ;B[rg]
 ;W[pe])))
 (;B[qg]LB[pc:A][qc:B]C[White continues with 'a'.
 'b' gives Black more influence.]
 (;W[pc]LB[oc:A][qc:B]C['a' takes outside influence, 'b' takes corner territory.]
 (;B[oc]LB[ob:a][qc:b][qd:c]C[White continues with 'a'. White 'b' keeps the position simple.
 White 'c' is not recommended.]
 (;W[ob]LB[nc:C][qc:B][od:A]C['a' is correct, 'b' is not recommended. 'c' is a mistake.
+]
 (;B[od]LB[pb:a][qb:b]C[White continues with 'a'. With a favorable ladder, White may play 'b'.]
 (;W[pb]
 ;B[nb]
 ;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[mc]LB[rb:a][re:b][dp:c]C[White can defensively with 'a', leaving the aji on the right for later; play 'b' (only to play 'a' later); or play elsewhere, and suffer an approach-move ko.]
 (;W[rb])
 (;W[re]
 ;B[rf]
 ;W[pe]LB[oe:a][qf:b]C[Black can squeeze with 'b', or leave the cutting stone with 'a'.]
 (;B[oe]
 ;W[qf]
 ;B[pf]
 ;W[qe]
 ;B[rg]
 ;W[rb]
 ;B[pg])
 (;B[qf]))
 (;W[]LB[rb:A][re:B]C[White plays elsewhere.
 Black creates a ko with 'a' instead of pushing White to unconditional life with 'b'.]
 (;B[rb]C[Black proceeds to an approach-move ko. Black has to add extra moves to make it a proper ko, so this is premature.]
 ;W[qb]
 ;B[rc]
 ;W[ra]
 ;B[sb]
 ;W[qc]
 ;B[sd]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[oa]
 ;W[pa]
 ;B[na]
 ;W[sc])
 (;B[re]C[Mistake.]
 ;W[rb])))
 (;W[qb]C[White must have the ladder to play 8.]
 ;B[nb]
 ;W[qd]
 ;B[qe]LB[qb:10][rd:B][re:A]TR[pb]C['a' tries to trick Black if White has the ladder, White lives without ko.
 'b' gives White gote or an approach move ko like White 10 on the triangled position.]
 (;W[re]
 ;B[rd]
 ;W[qc]LB[qf:B][rf:A]C[Black continues with 'a'.
 'b' tries to avois the White ladder too early and a wall too
 small results.]
 (;B[rf]C[This variations illustrates the favorable ladder for White.]
 ;W[pe]
 ;B[se]
 ;W[nc]
 ;B[oa]
 ;W[pb]LB[mb:B][nd:A]C['a' avoids the ladder. 'b' is very bad for Black if White has the ladder.]
 (;B[nd]
 ;W[mc]
 ;B[md]
 ;W[mb]
 ;B[ld])
 (;B[mb]
 ;W[mc]
 ;B[lc]
 ;W[oe]
 ;B[nd]
 ;W[md]
 ;B[ne]
 ;W[ld]LB[kc:A][nf:B]C['a' or 'b' are different disasters for Black.]
 (;B[kc]
 ;W[nf])
 (;B[nf]
 ;W[lb])))
 (;B[qf]
 ;W[rc]))
 (;W[rd]
 ;B[oa]
 ;W[pb]
 ;B[mc]
 ;W[dp]
 ;B[rb]
 ;W[ra]
 ;B[rc]
 ;W[qc]
 ;B[sb]
 ;W[pa]
 ;B[sd]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[na])))
 (;B[qc]
 ;W[pb]
 ;B[nc]LB[qb:B][qd:A]C['a' is correct. If 'b', White dies.]
 (;W[qd]
 ;B[qb]
 ;W[od]
 ;B[pe]
 ;W[nb]
 ;B[qe]
 ;W[mc]
 ;B[nd])
 (;W[qb]
 ;B[rc]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[rb]
 ;B[sb]))
 (;B[nc]
 ;W[qc]
 ;B[qd]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]))
 (;W[qc]LB[ob:a][od:b]C[
 Black continues with 'a'. Black 'b' permits White sente.]
 (;B[ob]
 ;W[re]
 ;B[pf]
 ;W[rb])
 (;B[od]
 ;W[re]
 ;B[pf]C[White can afford to play elsewhere.]))
 (;W[qd]LB[qg:5]SQ[pf]C[White 6 is not recommended. The result is similar to the one in the variation of Black 5 being on the squared position instead.]
 ;B[qe]
 ;W[od]
 ;B[pe]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[qc]
 ;W[pb]
 ;B[mc]
 ;W[rd]
 ;B[rc]
 ;W[rb]
 ;B[re]
 ;W[qb]
 ;B[sd]
 ;W[mb]
 ;B[lc]LB[qg:5]SQ[pf]C[The result is similar to the one in the variation of Black 5 being on the squared point, but Black 5 is in a better position here.]))
 (;B[qc]
 ;W[oc]LB[qb:B][qd:A]C['a' or 'b' are ok.
+]
 (;B[qd]
 ;W[lc])
 (;B[qb]
 ;W[ne]
 ;B[pe]
 ;W[lc])))
 (;W[qc]
 ;B[pc]
 ;W[qd]LB[qb:A][pe:C][qe:B]C['a' is correct, 'b' gives less influence. 'c' does not close on the right side.
+]
 (;B[qb]LB[rb:b][qf:a]C[White continues with 'a'. White 'b' is a fatal mistake.]
 (;W[qf]
 ;B[pf]
 ;W[qe]
 ;B[pg]
 ;W[rb]
 ;B[pb]
 ;W[rg]
 ;B[rh]
 ;W[sg]
 ;B[qi])
 (;W[rb]
 ;B[pb]LB[qe:A][qf:B]C[White lives on 'a', but a cut in the Black wall is gone. White 'b' dies.]
 (;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[pf]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi])
 (;W[qf]
 ;B[pf]
 ;W[qe]
 ;B[rg]LB[ra:a][rf:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[ra]
 ;B[sd])
 (;W[rf]
 ;B[ra]))))
 (;B[qe]
 ;W[re]
 ;B[rf]
 ;W[pe]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[nc]
 ;W[sd]
 ;B[oe])
 (;B[pe]
 ;W[qe]
 ;B[pb]
 ;W[qf]
 ;B[pf]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi])))
 (;B[qf]LB[ob:C][pb:B][pc:A][qc:D]C[White can play 'a', 'b' or 'c'.
 'c' leads to many variations which are the same as after 'a' or 'b'.
 'd' is a mistake, creating only a ko.]
 (;W[pc]LB[oc:B][qc:A]C[Black can take influence on 'a' or territory on 'b'.]
 (;B[qc]
 ;W[oc]LB[qb:B][qd:A]C[Both 'a' and 'b' are possible.]
 (;B[qd]
 ;W[lc]
 ;B[mb]C[Later Black can attack.]
 ;W[lb]
 ;B[nc]
 ;W[nd]
 ;B[ob]
 ;W[pb]
 ;B[od])
 (;B[qb]
 ;W[od]
 ;B[pe]
 ;W[lc]))
 (;B[oc]LB[ob:A][qc:B][qd:C]C['a' is correct. With 'b' or 'c', White lives in the corner.]
 (;W[ob]LB[pb:B][qc:A][od:C]C['a', 'b' or 'c'.]
 (;B[qc]
 ;W[pb]LB[qb:B][nc:A]C['a' or 'b' give the corner.]
 (;B[nc]LB[nb:A][qb:C][rc:B][qd:D]C['a' is correct, 'b' is similar. If 'c' or 'd', White dies.]
 (;W[nb]
 ;B[mc]
 ;W[rc]LB[qb:B][qd:A]C['a' gives the corner. 'b' pushes White outside.]
 (;B[qd]
 ;W[qb]
 ;B[rd]
 ;W[rb])
 (;B[qb]
 ;W[qd]
 ;B[rd]
 ;W[qe]
 ;B[rb]
 ;W[pe]
 ;B[od]
 ;W[re]
 ;B[sc]))
 (;W[rc]LB[qb:B][qd:A]C['a' gives White a small group in the corner.
 If 'b', White destroyes the side.]
 (;B[qd]
 ;W[qb]
 ;B[nb]
 ;W[ra])
 (;B[qb]
 ;W[qd]
 ;B[rb]
 ;W[pe]
 ;B[od]
 ;W[qe]))
 (;W[qb]
 ;B[rc]
 ;W[nb]
 ;B[mc]
 ;W[rb]
 ;B[sb]
 ;W[mb]
 ;B[lb])
 (;W[qd]
 ;B[rd]))
 (;B[qb]
 ;W[od]
 ;B[nc]
 ;W[qd]
 ;B[pe]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[rd]
 ;B[rc]
 ;W[sb]))
 (;B[pb]
 ;W[qc]LB[nb:B][qb:A]C['a' is correct. If 'b', White easily lives.]
 (;B[qb]LB[od:A][qd:B]C['a' is correct, 'b' is old.]
 (;W[od]
 ;B[nc]
 ;W[qd]
 ;B[pe]
 ;W[nb]LB[rb:A][mc:B]C['a' takes the corner, 'b' the outside.]
 (;B[rb]
 ;W[mc]
 ;B[nd]LB[md:A][me:B]C['a' if White is strong on the top left; 'b' if Black is strong on the top left.]
 (;AW[ec][hc]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[je])
 (;AB[dc][gc]
 ;W[me]
 ;B[md]
 ;W[ld]
 ;B[ne]
 ;W[nf]
 ;B[oe]
 ;W[le]
 ;B[lc]C[Later this continuation is not favorable for Black.]
 ;W[kc]
 ;B[mb]
 ;W[lb]
 ;B[mc]
 ;W[kd]
 ;B[kb]
 ;W[jb]
 ;B[la]
 ;W[ic]))
 (;B[mc]
 ;W[rb]))
 (;W[qd]LB[od:B][pe:A]C['a' is better than 'b'.]
 (;B[pe]LB[nb:A][od:B]C[White continues with 'a' to sacrifice the three corner stones for life at top.
 White 'b' lets White live in the corner with just two eyes; an unacceptable loss for White in the early game.]
 (;W[nb]
 ;B[rb]
 ;W[kc]
 ;B[jd]
 ;W[od]
 ;B[nc]
 ;W[mc]
 ;B[nd])
 (;W[od]C[White 12 is a mistake. White's two-eyed corner is nothing to Black's thickness.]
 ;B[nc]
 ;W[rb]
 ;B[nb]
 ;W[qa]
 ;B[oa]
 ;W[sc]))
 (;B[od]
 ;W[rb]
 ;B[nb]
 ;W[qe]
 ;B[pf]
 ;W[qa]
 ;B[oa]
 ;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qh])))
 (;B[nb]
 ;W[od]
 ;B[nc]
 ;W[qb]
 ;B[oa]
 ;W[pe]))
 (;B[od]
 ;W[pb]
 ;B[nb]
 ;W[qd]
 ;B[qe]
 ;W[rd]LB[rb:B][mc:A]C['a' is correct. 'b' is a mistake.]
 (;B[mc]C[White can tenuki, because Black can only make a disadvantageous ko.]
 ;W[]
 ;B[rb]LB[qb:A][rc:B]C['a' is followed by a better endgame than 'b',]
 (;W[qb]
 ;B[rc]
 ;W[ra]
 ;B[sb]LB[pa:C][qa:B][qc:A]C[If 'a', ko. White dies with 'b' or 'c'.]
 (;W[qc]
 ;B[oa]
 ;W[pa]
 ;B[sd]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[na]
 ;W[sc])
 (;W[qa]
 ;B[oa]
 ;W[re]
 ;B[rf]
 ;W[se]
 ;B[sc])
 (;W[pa]
 ;B[qc]))
 (;W[rc]
 ;B[qb]
 ;W[sb]
 ;B[ra]LB[qc:A][sc:B][re:C]C[If 'a', ko. White dies with 'b' or 'c'.]
 (;W[qc]
 ;B[re]
 ;W[sd]
 ;B[pa]
 ;W[oa]
 ;B[na]
 ;W[qa])
 (;W[sc]
 ;B[re]
 ;W[qa]
 ;B[oa])
 (;W[re]
 ;B[qc])))
 (;B[rb]
 ;W[nc]LB[mb:A][mc:B]C['a' or 'b'.]
 (;B[mb]LB[ne:A][pe:B]C[Later, White has continuations on 'a' or 'b'.])
 (;B[mc]
 ;W[qb]
 ;B[rc]
 ;W[na]
 ;B[mb]
 ;W[ra]
 ;B[sb]
 ;W[qc]C[White lives in double ko.]))))
 (;W[qc]
 ;B[ob]
 ;W[re]
 ;B[rf]
 ;W[qe]
 ;B[pe]
 ;W[qd]LB[ra:B][pf:A]C['a' or 'b'.]
 (;B[pf]
 ;W[pb])
 (;B[ra]
 ;W[pf]))
 (;W[qd]LB[qc:B][pe:A]C[With 'a', White in the corner. With 'b', White on the right side.]
 (;B[pe]
 ;W[qb]
 ;B[ob]
 ;W[re]
 ;B[rf]
 ;W[rc])
 (;B[qc]
 ;W[pb]
 ;B[ob]
 ;W[pe]
 ;B[od]
 ;W[qe]
 ;B[rc]
 ;W[pf]))))
 (;W[pb]LB[nb:C][oc:B][pc:A]C['a', 'b' or 'c'.]
 (;B[pc]LB[ob:A][qb:B]C['a' right, 'b' wrong.]
 (;W[ob]
 ;B[qb]
 ;W[rb]LB[qa:B][qc:A]C['a' right, 'b' wrong.]
 (;B[qc]
 ;W[lc]
 ;B[je]
 ;W[le]LB[nc:A][nd:B]C[Later, White wants to play 'a'. White 'b' is a mistake.]
 (;W[nc])
 (;W[nd]C[White 11 is a mistake.]
 ;B[oc]
 ;W[nc]
 ;B[mb]C[Black 14 gouges White's living space.]))
 (;B[qa]
 ;W[mc]
 ;B[]LB[qc:A][rd:C][qg:B]C[Later, White may use the aji on 'a' by occupying 'b', aiming at 'c'.]
 ;W[qg]LB[pf:A][rf:D][pg:B][rg:C]
 (;B[pf]
 ;W[rf]
 ;B[re]
 ;W[rd]
 ;B[qd]
 ;W[rc]
 ;B[qc]
 ;W[se])
 (;B[pg]
 ;W[qe])
 (;B[rg]
 ;W[qe])
 (;B[rf]
 ;W[pe]
 ;B[qe]
 ;W[qc]
 ;B[rc]
 ;W[od]TR[rf][qg]C[Now, the exchange of the marked stones is bad for Black.])))
 (;W[qb]
 ;B[ob]C[White is dead.]))
 (;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[nc]LB[mb:A][mc:B]C[Black can enclose White on 'a' or hunt White on 'b'.]
 (;B[mb]
 ;W[qd]
 ;B[qe]
 ;W[rd]
 ;B[od]C[This is not bad shape in this situation.]
 ;W[rb])
 (;B[mc]
 ;W[nd]
 ;B[mb]
 ;W[qd]
 ;B[qc]
 ;W[pc]
 ;B[rd]
 ;W[od]
 ;B[qe]C[White has no eyes and must run.]))
 (;B[nb]LB[oc:B][qc:A]C['a' correct. Black wants to lure White into the mistake 'b'.]
 (;W[qc]
 ;B[qd]LB[rb:B][rd:A]C['a' lives or goes out. 'b' lives.]
 (;W[rd]LB[rb:B][re:A]C['a' encloses White living. 'b' attacks White pushing him out.]
 (;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[nc]LB[ob:A][nc:15][dp:B]C[Black 15 is sente against the life of the White group. White must answer on 'a'. Tenuki on 'b' is wrong.]
 (;W[ob])
 (;W[]
 ;B[qa]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]LB[nc:15]C[After Black 15, White cannot go out and dies.]))
 (;B[rb]
 ;W[rc]
 ;B[re]
 ;W[sb]
 ;B[ra]
 ;W[sd]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[nc]
 ;B[mb]
 ;W[mc]
 ;B[lb]
 ;W[od]))
 (;W[rb]LB[nc:A][rd:B]C[Neither 'a' or 'b' kill.]
 (;B[nc]
 ;W[rd]
 ;B[re])
 (;B[rd]
 ;W[ob]
 ;B[nc]
 ;W[rc]
 ;B[oa]
 ;W[qa]
 ;B[sc]
 ;W[sb])))
 (;W[oc]
 ;B[qc]
 ;W[nc]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[ne])))
 (;W[ob]LB[pb:b][nc:d][oc:c][pc:a]C[
 Black continues with 'a' to 'c'. Black 'd' is not recommended.]
 (;B[pc]
 ;W[pb]LB[ob:6][pb:8]C[Same variation as White 8 first.])
 (;B[pb]LB[oc:c][pc:a][pe:b]C[White continues with 'a'.
 White 'b' is a trick play.
 White 'c' is a mistake.]
 (;W[pc]LB[oc:A][qc:B]C[Black continues with 'a' or 'b'.]
 (;B[oc]LB[pc:8]C[Same variation as White 8 first.])
 (;B[qc]
 ;W[oc]
 ;B[qb]
 ;W[od]
 ;B[pe]
 ;W[lc]))
 (;W[pe]C[White 6 is a trick play.]
 ;B[qe]
 ;W[pc]LB[oc:a][qc:b]C[Black continues with 'a'. Black 'b' falls for the trick.]
 (;B[oc]
 ;W[qc]
 ;B[od]LB[nb:b][qb:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[mc])
 (;W[nb]C[White 12 is a mistake.]
 ;B[qb]))
 (;B[qc]C[Black 9 is a mistake.]
 ;W[oc]
 ;B[qb]
 ;W[od]
 ;B[qd]
 ;W[lc]))
 (;W[oc]C[White 6 is a mistake.]
 ;B[pc]
 ;W[lc]
 ;B[od]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[je]
 ;W[lf]
 ;B[nf]C[The solid connection of Black 15, preventing White from attaching there, is the right way to attack.]))
 (;B[oc]LB[pb:A][qc:B]C['a' or 'b'.]
 (;W[pb]LB[nb:A][qc:B]C['a' is correct, 'b' is questionable.]
 (;B[nb]LB[pb:8]C[Same variation as White 8 first.])
 (;B[qc]
 ;W[nc]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[ld]
 ;W[pc]
 ;B[od]LB[qb:A][rc:B]C['a' or, with the ladder, 'b'.]
 (;W[qb]
 ;B[rc]
 ;W[kb])
 (;W[rc]
 ;B[qd]
 ;W[qb]
 ;B[rd]
 ;W[sc])))
 (;W[qc]
 ;B[nb]
 ;W[qd]
 ;B[qe]
 ;W[pb]
 ;B[mc]
 ;W[rb]))
 (;B[nc]C[Black 5 is slack; not recommended.]
 ;W[nb]
 ;B[mc]
 ;W[oc]
 ;B[od]
 ;W[qc]
 ;B[qd]
 ;W[rc]
 ;B[rd]
 ;W[sd]))
 (;W[qc]
 ;B[pc]LB[pb:A][qd:B][rd:C]C['a' or 'b' lead to ko. White runs out to the right with 'c'.]
 (;W[pb]
 ;B[ob]LB[rb:A][rd:B]C['a' or 'b' -> ko.]
 (;W[rb]LB[pa:A][rd:B]C['a' leads to ko. With 'b', Black can attempt to kill if he has additional outside strength.]
 (;B[pa]
 ;W[qa]
 ;B[qb])
 (;B[rd]
 ;W[qd]LB[qe:A][re:B]C['a': White lives with 'a'. White fights to the outside with 'b'. ]
 (;B[qe]
 ;W[rc])
 (;B[re]
 ;W[oc])))
 (;W[rd]
 ;B[re]
 ;W[qd]
 ;B[pe]
 ;W[rb]
 ;B[pa]
 ;W[qa]))
 (;W[qd]
 ;B[qe]
 ;W[pb]
 ;B[ob]LB[qb:B][rb:A]C['a' leads to ko. White dies with 'b'.]
 (;W[rb]
 ;B[pa]
 ;W[qa]
 ;B[qb])
 (;W[qb]
 ;B[rd]
 ;W[rc]
 ;B[re]))
 (;W[rd]
 ;B[qb]
 ;W[rb]
 ;B[qd]
 ;W[rc]
 ;B[pb]LB[re:B][rf:A]C[With 'a', White tries to more stones find a connection on the right. White dies with 'b'.]
 (;W[rf]
 ;B[re]
 ;W[se]
 ;B[qe]
 ;W[rg])
 (;W[re]
 ;B[rf]))))
 (;B[qj]C[Bad
+]
 ;W[oj]C[Punishment
+]
 ;B[ph]
 ;W[qc]))
 (;W[qf]LB[nd:A][qe:B]C['a' is usual. 'b' can punish a White mistake.]
 (;B[nd]LB[lc:b][qc:a][md:c]C[White invades at 'a' to 'c'. 'a' is simplest and most effective.]
 (;W[qc]
 ;B[qd]
 ;W[rd]LB[pc:b][re:a]C[White continues with 'a' or 'b'. White 'a' is typical. Black plays 'b' to get sente (and pays a bit for it).]
 (;B[re]LB[rb:b][rc:a]C[White continues at 'a' or 'b'. 'b' leaves White a little thin.]
 (;W[rc]
 ;B[qe]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[od]
 ;B[oe]
 ;W[pc]
 ;B[ne])
 (;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qe]
 ;W[nb]C[White's shape is a little thin.]))
 (;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]))
 (;W[lc]LB[kd:a][ld:b]C[Black continues with 'a' or 'b'.]
 (;B[kd]LB[nc:b][oc:a]C[White continues with 'a' or 'b'.]
 (;W[oc]LB[pc:b][od:a]C[Black continues with 'a'. Black 'b' lets White into the center.]
 (;B[od]LB[nc:b][pc:a]C[White continues with 'a' or 'b'.]
 (;W[pc]
 ;B[qc]
 ;W[qb]LB[rb:a][rd:b]C[Black continues with 'a' or 'b'. Black 'b' captures White 6.]
 (;B[rb]
 ;W[ld]
 ;B[le]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[pb]
 ;B[rd])
 (;B[rd]
 ;W[rb]
 ;B[mb]
 ;W[nb]
 ;B[mc]LB[re:a]C[Later, White 'a' is sente.]))
 (;W[nc]
 ;B[pc]
 ;W[ld]
 ;B[le]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[ic]
 ;W[mb]
 ;B[me]))
 (;B[pc]
 ;W[od]
 ;B[oe]
 ;W[nc]
 ;B[pe]
 ;W[le]C[White 14 is the only way to play.]))
 (;W[nc]
 ;B[oc]
 ;W[md]
 ;B[ne]
 ;W[ob]
 ;B[nb]
 ;W[mb]C[White intends to fight the ko.]))
 (;B[ld]
 ;W[mc]LB[kd:b][md:a]C[Black continues with 'a' or 'b'.]
 (;B[md]
 ;W[kc]LB[jd:b][kd:a]C[Black continues with 'a' or 'b'.]
 (;B[kd]
 ;W[jb]LB[ic:b][nc:a]C[Black continues with 'a' or 'b'.]
 (;B[nc]
 ;W[ic]
 ;B[jd]
 ;W[lb])
 (;B[ic]
 ;W[ib]
 ;B[hc]
 ;W[ob]
 ;B[qc]))
 (;B[jd]
 ;W[pb]
 ;B[qb]LB[ob:A][qc:B]C[White continues with 'a' or 'b'. With 'b', White gives up the three stones, takes the corner and can connect to White 4.]
 (;W[ob]
 ;B[qc]
 ;W[jb]
 ;B[ib]
 ;W[ka]
 ;B[kd])
 (;W[qc]
 ;B[pc]
 ;W[rb]
 ;B[ob]
 ;W[qa])))
 (;B[kd]LB[pc:a][qc:b]C[White continues with 'a' or 'b'.]
 (;W[pc]LB[oc:a][qc:b]C[Black continues with 'a' or 'b'.]
 (;B[oc]C[Black 11 captures the two stones, and is a good result for Black.]
 ;W[qc]
 ;B[ob]
 ;W[qd]
 ;B[pe]
 ;W[qe]
 ;B[og])
 (;B[qc]
 ;W[qb]
 ;B[rd]
 ;W[oc]
 ;B[od]
 ;W[nc]
 ;B[rb]
 ;W[pa]
 ;B[md]))
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[qb]
 ;B[pb]
 ;W[pf]C[Black gets a good result.]))))
 (;W[md]LB[me:b][ne:a]C[Black continues with 'a' or 'b'.]
 (;B[ne]
 ;W[kd]
 ;B[jd]LB[ke:a][kf:b]C[White continues with 'a' or 'b'.]
 (;W[ke]
 ;B[je]
 ;W[kf]
 ;B[ig])
 (;W[kf]
 ;B[je]
 ;W[mf]
 ;B[qe]
 ;W[pf]
 ;B[nf]
 ;W[mg]
 ;B[ng]))
 (;B[me]
 ;W[ld]
 ;B[ne]LB[jd:b][le:a]C[White continues with 'a' or 'b'.]
 (;W[le]
 ;B[je]
 ;W[lg])
 (;W[jd]
 ;B[id]
 ;W[je]
 ;B[kc]
 ;W[le]
 ;B[mb]))))
 (;AW[qi]PL[W]
 ;B[qe]
 ;W[pf]C[Now the White extension is too narrow.]
 ;B[nd]
 ;W[qc]LB[pc:A][qd:C][re:B]C['a' for security if White is strong, 'b' for fight if White is weak, 'c' as a compromise between both if White is not strong and not weak.]
 (;B[pc]
 ;W[re]LB[qd:A][rd:B]C['a' to capture the White stone, or 'b' to maximize eye space.]
 (;B[qd]LB[rd:A][rg:B]TR[qk]C[Usual is White 'a'.
 If there is a Black stone at the triangled position, Black 'b' or White 'a'.]
 (;W[rd]
 ;B[rc]LB[rb:A][sd:B]C[Later continuation White 'a' or Black 'b'.]
 (;W[rb]
 ;B[qb]
 ;W[sc])
 (;B[sd]LB[se:B][rf:A]C['a' or 'b'.]
 (;W[rf])
 (;W[se]LB[rb:B][sc:A]C['a' gote or 'b' sente.]
 (;B[sc]
 ;W[rf]
 ;B[qb])
 (;B[rb]
 ;W[sc]))))
 (;AB[qk]LB[rd:B][rg:A]PL[W]
 (;B[rg]
 ;W[rf]
 ;B[ri]
 ;W[rc]
 ;B[rd]
 ;W[sd]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[ra])
 (;W[rd]
 ;B[rc]
 ;W[dp]
 ;B[rg]
 ;W[rf]
 ;B[ri])))
 (;B[rd]
 ;W[qd]LB[qb:B][rc:A]C['a' is correct. 'b' is a mistake.]
 (;B[rc]
 ;W[pe]
 ;B[qb])
 (;B[qb]LB[rc:A][pe:B]C['a' is the correct punishment. 'b' misses punishment and reverts to joseki.]
 (;W[rc]
 ;B[pe]
 ;W[sd])
 (;W[pe]
 ;B[rc]))))
 (;AB[qk]
 ;B[re]LB[ob:B][oc:A][nd:7]TR[nc]C['a' in this position.
 'b' if Black 7 is on the triangled position instead.]
 (;W[oc]
 ;B[od]
 ;W[nc]
 ;B[pc]
 ;W[pb]
 ;B[mc]LB[mb:B][rb:A]C['a' or 'b'.]
 (;W[rb]
 ;B[mb]
 ;W[oa]
 ;B[nf]
 ;W[oi]
 ;B[ok])
 (;W[mb]
 ;B[qb]
 ;W[ob]
 ;B[rc]
 ;W[kc]
 ;B[jd]
 ;W[md]
 ;B[me]
 ;W[lc]
 ;B[ke]
 ;W[oi]
 ;B[ok]))
 (;AE[nd]AB[nc]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]
 ;W[rb]
 ;B[nd]
 ;W[rd]))
 (;B[qd]LB[pb:A][pc:B]C[Later, 'a' gives life, 'b' a ko, which is not necessarily worse than 'a'.]
 (;W[pb]
 ;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[ob]LB[rd:A]C[This move instead of 'a' is the right one, because Black seals his territory to the top and will get a better position to slide into the right.]
 ;W[rd]
 ;B[re]
 ;W[sc]LB[se:A][sf:B]C['a' and 'b' damage White on the right and are sente against the White corner.]
 (;B[se])
 (;B[sf]))
 (;W[pc]
 ;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc]LB[rc:A][se:B]C['a' is necessary, the mistake 'b' gives life to the White corner.]
 (;B[rc])
 (;B[se]
 ;W[ob]
 ;B[rc]
 ;W[sb]
 ;B[nb]
 ;W[pb]))))
 (;B[qe])))
 (;B[mc]LB[qc:a][qd:b][qf:c][dp:d]C[
 -Space Extension = Nikken Biraki = Dukan Peollim = Chai E`r
 -------------------------------------------------------------
 White continues with 'a' to 'c' or elsewhere 'd'.
+]
 (;W[qc]
 ;B[qd]
 ;W[pc]LB[oc:A][rc:C][od:B]TR[qj]C['a' or 'b' are ok.
 If Black has an additional stone on or near the triangled position, he build his moyo on 'c'.]
 (;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[od]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]LB[pa:b][pb:a][oe:c]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[pb]
 ;B[oe]LB[nd:a][se:b]C[White 'a' is useless.
 Later, Black 'b' is sente.]
 (;W[nd]
 ;B[me]
 ;W[pe]
 ;B[qe]
 ;W[ne]
 ;B[nf]
 ;W[of]
 ;B[md]
 ;W[oe]
 ;B[og])
 (;B[se]TR[na]C[Later, this is sente. 'a' Black stone on the triangled position would not be sente.]
 ;W[dp]
 ;B[rb]
 ;W[sb]
 ;B[qa]
 ;W[sd]
 ;B[sa]
 ;W[qb]
 ;B[sc]))
 (;W[pa]
 ;B[na]TR[se]C[Later, this is sente.
 A Black stone on the triangled position would not be sente.]
 ;W[dp]
 ;B[pb]
 ;W[qb]
 ;B[ra])
 (;W[oe]CR[qj]LB[pb:b][pf:a]C[White 15 is not recommended, and might only make sense with White support on the right near the marked point.
 Black continues with 'a' if White has such support. Otherwise, Black proceeds to kill the White corner stones with 'b'.]
 (;B[pf]C[Black answers with 16 if White has a supporting stone such as shown.]
 ;W[pb]
 ;B[nf]
 ;W[md]C[White can escape, but in doing so makes bad shape and will suffer relentless attack if no support exists to connect to. In other words, White should only play 19 at the right time.]
 ;B[me]
 ;W[nd]
 ;B[ld]
 ;W[le]
 ;B[kd]
 ;W[mf]
 ;B[of]
 ;W[ne]
 ;B[pe]
 ;W[me]
 ;B[mg])
 (;B[pb]C[Black to kill the White corner stones. White has made a terrible mistake.]
 ;W[qb]
 ;B[oa]
 ;W[pf]
 ;B[qe]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[sd]LB[rj:a]C[White 'a' is not sente.])))
 (;B[od]LB[ob:B][oc:A]C['a' is correct. 'b' loses territory.]
 (;W[oc]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;W[ob]LB[nb:A][rc:B]C['a' is usual. 'b' gives more territory for more influence.]
 (;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[nc]
 ;B[nd]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc])))
 (;AB[qj]
 ;B[rc]LB[rb:B][nc:A]C['a' is correct. 'b' is a mistake.]
 (;W[nc]
 ;B[nd]
 ;W[od]
 ;B[oe]
 ;W[oc]
 ;B[md]
 ;W[rb]
 ;B[rd]
 ;W[mb]
 ;B[lb]LB[ma:B][na:A]C['a' is correct, 'b' is bad.]
 (;W[na]
 ;B[kc]
 ;B[sb]C[Later Black plays here.]
 ;W[ra]LB[ka:B][la:A]C['a' and 'b' are sente.]
 (;B[la]
 ;W[pa])
 (;B[ka]LB[pa:A][dp:B]C['a' is correct. Tenuki with 'b': White dies.]
 (;W[pa])
 (;W[dp]
 ;B[ma]
 ;W[nb]
 ;B[pb])))
 (;W[ma]
 ;B[kc]
 ;B[oa]
 ;W[ob]
 ;B[qa]
 ;W[qb]
 ;B[la]LB[pa:A][nb:B]C['a': White loses points.
 'b': White dies.]
 (;W[pa]
 ;B[pb]
 ;W[ra]
 ;B[nb]
 ;W[pa]
 ;B[na])
 (;W[nb]
 ;B[sb]
 ;W[ra]
 ;B[pa])))
 (;W[rb]
 ;B[rd]
 ;W[nc]
 ;B[nd]
 ;W[od]
 ;B[oe]
 ;W[oc]
 ;B[mb]C[And Black punishes White's wrong move order.])))
 (;W[qd]LB[qc:A][qe:B]C['a' is usual. 'b' requires the ladder.]
 (;B[qc]LB[pc:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[rc]
 ;W[of]LB[od:a][pe:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[od]
 ;W[qh])
 (;B[pe]C[Black 8 is not recommended. White gets superior thickness to Black territory.]
 ;W[pf]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[pc]
 ;W[rg]
 ;B[re]
 ;W[nf]))
 (;W[pc]
 ;B[od]
 ;W[rc]
 ;B[qb]
 ;W[qe]
 ;B[rb]
 ;W[qh]))
 (;B[qe]
 ;W[re]
 ;B[pe]
 ;W[rc]
 ;B[rf]
 ;W[pc]
 ;B[se]
 ;W[rd]
 ;B[oc]
 ;W[ob]
 ;B[pb]
 ;W[qc]LB[nb:B][nc:A]C['a' lets White live. 'b' provokes the ladder.]
 (;B[nc]
 ;W[qb])
 (;B[nb]
 ;W[od]
 ;B[oa]
 ;W[qf]
 ;B[rg]
 ;W[oe]
 ;B[pf]
 ;W[qg]
 ;B[of]
 ;W[rh]
 ;B[qh]
 ;W[pg]
 ;B[ri]
 ;W[ph]
 ;B[qi]
 ;W[nf])))
 (;W[qf]
 ;B[qd]
 ;W[qi])
 (;W[dp]LB[qe:A][qf:D][qg:C][pj:B][qj:E]TR[qh][qi][qk]C['a' or 'b' are correct,
 'c' and 'd' are bad, also any second low extension from the hoshi (triangled points). The general way to punish is shown after 'e'.
+]
 (;B[qe]CR[kc]LB[ob:D][nc:E][oc:A][qc:B][dd:C]TR[jc]C[To reduce the top side, White starts on 'a'.
 To reduce the right side, White starts on 'b'.
 If White has a stone on the triangled or circled position, he can invade at 'a'.
 If White has a stone on the circled position, he can invade at 'd' or 'e'.
 If White has a stone on the squared position, he can invade at B.
 After another tenuki 'c', White can no more invade.
 ]MA[qg]
 (;W[oc]LB[pc:A][nd:B][od:C]C['a' is correct, 'b' and 'c' are bad.]
 (;B[pc]
 ;W[me]LB[kd:C][md:B][od:A][pp:D]C['a' is correct, 'b', 'c' and tenuki 'd' are questionable.]
 (;B[od]C[End of joseki]
 ;W[lc]LB[lb:A][nc:E][ld:C][md:D][pp:B]C[Later continuation for White.
 'a' and tenuki 'b' are possible. 'c' depends on the ladder. 'd'and 'e' are not recommended.]
 (;B[lb]
 ;W[mb]LB[nb:B][kc:C][ld:A]C['a' is best, gives a large fight, 'b' gives a low position, 'c'
 if Black has the ladder.]
 (;B[ld]LB[kc:A][md:B]C['a' is correct, 'b' is questionable.]
 (;W[md]LB[kc:B][nc:A]C['a' pushes the fight to the top left, 'b' to the right center.]
 (;B[nc]
 ;W[kc]
 ;B[le]
 ;W[lf]
 ;B[jd])
 (;B[kc]
 ;W[nc]LB[lc:A][nd:B]C['a' big fight, 'b' ko.]
 (;B[lc])
 (;B[nd])))
 (;W[kc]
 ;B[md]C[White in deep trouble.]))
 (;B[nb]
 ;W[md]LB[ma:A][nc:B]C['a' is correct. 'b' is a mistake.]
 (;B[ma]
 ;W[nc]
 ;B[mb]
 ;W[kc]LB[ke:A]C[Black in low position.
 A is a big follow-up for both.])
 (;B[nc]
 ;W[kb]
 ;B[ma]
 ;W[kd]))
 (;B[kc]LB[nc:A][ld:B]C['a' if Black has the ladder, 'b' if White has the ladder.]
 (;W[nc]
 ;B[ld]
 ;W[md]LB[nb:B][lc:A]C['a' big fight, 'b' ko.]
 (;B[lc]
 ;W[nd]
 ;B[kf]
 ;W[mg]C[Result depends on how the fight fits in the whole board position.])
 (;B[nb]))
 (;W[ld]
 ;B[nb]
 ;W[kb]
 ;B[ma]
 ;W[jc])))
 (;B[pp])
 (;B[ld]
 ;W[md]
 ;B[kc]
 ;W[lb]
 ;B[kb]
 ;W[mb]
 ;B[nc]
 ;W[kd]
 ;B[le]
 ;W[jd])
 (;B[md]
 ;W[ld]LB[lb:B][le:A]C[White 'a' is less bad than 'b'.]
 (;B[le]
 ;W[ke]
 ;B[lf]
 ;W[mb]C[White's sacrifice stone works well.])
 (;B[lb]
 ;W[kb]
 ;B[mb]
 ;W[le]))
 (;B[nc]C[Black overconcentrated.]))
 (;B[md]
 ;W[ne]
 ;B[od])
 (;B[kd]LB[nc:A][pf:B]C['a' makes a low position on one side, but gives the other to Black.
 'b' avoids strenghening Black.]
 (;W[nc]LB[md:B][nd:A][oe:C]C['a' is usual. 'b' and 'c' don't hurt White.]
 (;B[nd]
 ;W[md]LB[ld:A][od:B]C['a' keeps the top side, 'b' the right side.]
 (;B[ld]
 ;W[od]
 ;B[ne]
 ;W[oe]
 ;B[nf]
 ;W[of]
 ;B[ng]
 ;W[qf]
 ;B[rf]
 ;W[rg])
 (;B[od]
 ;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[ob]
 ;W[ld]))
 (;B[md]
 ;W[oe])
 (;B[oe]
 ;W[lc]))
 (;W[pf]
 ;B[qf]
 ;W[pg]LB[nc:A][od:B]C[Later, White 'a' or 'b' or Black 'b'.]))
 (;B[pp]LB[lc:A][nc:B][od:C]C['a', 'b' or 'c'.]
 (;W[lc])
 (;W[nc])
 (;W[od])))
 (;B[nd]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[rc]LB[rb:B][od:A]C['a': White lives, 'b': White dies.]
 (;W[od]
 ;B[oe]
 ;W[qd]
 ;B[pe]
 ;W[rd]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qb])
 (;W[rb]
 ;B[rd]))
 (;B[od]
 ;W[nc]LB[md:A][nd:B]C[Black cannot kill on 'a' or 'b'.]
 (;B[md]
 ;W[qc])
 (;B[nd]
 ;W[mb]LB[lb:B][lc:A]C['a' goes outside, 'b' takes the corner.]
 (;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[qb])
 (;B[lb]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[nb]
 ;W[la]
 ;B[ob]))))
 (;W[qc]LB[pc:A][rd:B][re:C]C['a' is usual, 'b' is not recommended.]
 (;B[pc]LB[rd:C][pf:A][qf:B]C['a' or 'b' depending on the surrounding stones. 'c' makes a ko.]
 (;W[pf]LB[nf:C][qf:A][qg:B]C['a' is correct, 'b' and 'c' are not good.]
 (;B[qf]
 ;W[ph])
 (;B[qg]
 ;W[qf]
 ;B[rf]
 ;W[re]LB[rd:A][rg:B]C['a' ladder, 'b' ko in the corner.]
 (;B[rd]
 ;W[rg]
 ;B[se]
 ;W[qh])
 (;B[rg]
 ;W[pb]
 ;B[ob]
 ;W[rb]))
 (;AB[qj]
 ;B[nf]LB[nf:9][qf:A]TR[qj]C[Even with the marked stone, Black 9 is bad and should be on 'a'.]
 ;W[qf]
 ;B[re]
 ;W[pi]))
 (;W[qf]LB[pf:B][rf:A]C['a' or 'b'.]
 (;B[rf]
 ;W[rg]LB[pf:B][qg:A]C['a' or 'b'.]
 (;B[qg]
 ;W[pf]LB[pf:12][qf:8][rg:10]C[Same variation as White 12 before 8 and 10.])
 (;B[pf]
 ;W[qg]LB[re:A]C[Later, White can capture at 'a' in sente.]))
 (;B[pf]
 ;W[qg]LB[re:A][pg:B]C[A and 'b' are miai for White.]))
 (;W[rd]
 ;B[re]
 ;W[pb]LB[ob:A][rb:B]TR[kc]C['a' is correct.
 'b' is correct, if there is an additional Black stone on the triangled position.]
 (;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa])
 (;B[rb]
 ;W[qb]
 ;B[rc]
 ;W[qd]
 ;B[sd]
 ;W[ra]
 ;B[sc]
 ;W[nb]
 ;B[oe]
 ;W[mb]LB[rb:11]TR[kc]C[If there is an additional Black stone on the triangled position,
 Black kills.
 Else Black 11 was a mistake.])))
 (;B[rd]
 ;W[ob]LB[rb:B][nc:A]C[White gets something after 'a' or 'b'.]
 (;B[nc]
 ;W[rc]
 ;B[pc]
 ;W[pb]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[qa])
 (;B[rb]
 ;W[lc]))
 (;B[re]C[White has a lot of aji in the corner.]))
 (;W[dd]
 ;B[qh]
 ;W[qc]
 ;B[pc]
 ;W[rd]LB[pb:A][re:B]C[Black kills on 'a' or 'b'.]
 (;B[pb])
 (;B[re]
 ;W[pb]
 ;B[rb]
 ;W[qb]
 ;B[ob]
 ;W[ra]
 ;B[sb]
 ;W[se]
 ;B[pa]))
 (;AW[kc]LB[ob:B][nc:C][oc:A]C['a', 'b' or 'c'.
+]
 (;W[oc]
 ;B[pc]
 ;W[nc]LB[md:B][ne:A]
 (;B[ne]
 ;W[md])
 (;B[md]
 ;W[mb]
 ;B[lb]
 ;W[oe]
 ;B[od]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[ld]
 ;B[lc]
 ;W[kb]))
 (;W[ob]LB[pb:A][nc:B]C['a' saves mosts points. 'b' tries to get all in a ko.
+]
 (;B[pb]
 ;W[nc]
 ;B[nd]
 ;W[mb])
 (;B[nc]
 ;W[oc]
 ;B[od]
 ;W[rc]
 ;B[qb]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[oa]
 ;B[nb]
 ;W[qa]C[Ko
 ]))
 (;W[nc]LB[oc:B][md:C][nd:A]C['a' or 'b' are okay.
 'c' is not recommended.]
 (;B[nd]
 ;W[mb]LB[nb:B][oc:A]C['a' is correct. 'b' is a mistake.]
 (;B[oc]
 ;W[nb]
 ;B[md])
 (;B[nb]
 ;W[oc]
 ;B[lb]
 ;W[od]))
 (;B[oc]LB[nb:A][nd:B]C['a' or 'b' are okay.]
 (;W[nb]
 ;B[nd]
 ;W[mb]
 ;B[md])
 (;W[nd]
 ;B[nb]
 ;W[md]))
 (;B[md]
 ;W[mb]
 ;B[lb]
 ;W[ob]
 ;B[ma]
 ;W[nb]
 ;B[lc]
 ;W[nd]
 ;B[ne]
 ;W[pc]))))
 (;B[pj])
 (;B[qg]
 ;W[qc]
 ;B[pc]LB[qd:A][rd:B]TR[qi]C['a' big Ko, 'b' creates a small living group, Black gets better shape.
 'b' isn't possible if there is an additional Black stone on the marked position.]
 (;W[qd]
 ;B[qe]
 ;W[re]
 ;B[rf]
 ;W[pe]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa])
 (;W[rd]
 ;B[qb]
 ;W[rb]
 ;B[qd]
 ;W[rc]
 ;B[pb]
 ;W[rf]LB[ra:C][qf:B][rg:A]TR[qi]C['a' or 'b'.
 With an additional stone on the marked position, 'c' kills.]
 (;B[rg]
 ;W[qf]
 ;B[pf]
 ;W[ra])
 (;B[qf]
 ;W[rg]
 ;B[rh]
 ;W[se])
 (;AB[qi]
 ;B[ra])))
 (;B[qf]LB[pc:A][qc:B]C['a' is correct, leading to life. 'b' is a mistake, makes only a ko.]
 (;W[pc]LB[oc:A][qc:B]C['a' is usual, 'b' can be possible.]
 (;B[oc]
 ;W[qd]LB[qc:B][pe:A]C['a': White lives enclosed. 'b': fight for the right side.]
 (;B[pe]
 ;W[qb]
 ;B[ob]
 ;W[re]
 ;B[rf]
 ;W[rc]
 ;B[pb]
 ;W[qc])
 (;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[pe]
 ;B[od]
 ;W[qe]
 ;B[rf]))
 (;B[qc]LB[nc:B][oc:A]
 (;W[oc]
 ;B[od]
 ;W[qb]
 ;B[nc]
 ;W[rc]
 ;B[qd]
 ;W[ob]TR[mc]C[If this is good for Black, depends on the usefullness of the triangled stone.])
 (;W[nc]
 ;B[nd]
 ;W[od]
 ;B[oe]
 ;W[oc]
 ;B[md]
 ;W[qd]
 ;B[pe]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[mb]
 ;B[lb]
 ;W[nb])))
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[pa]
 ;W[qa]))
 (;B[qj]C[Two low extensions from the hoshi: bad.
+]
 ;W[oj]C[Whtie punishes.
+]
 ;B[ph]
 ;W[qc])))
 (;B[nc]LB[qc:B][qd:D][re:A][qf:C][dp:E]C[
 Keima Biraki
 --------------
 White continues with 'a'.
 White 'b' gives life in a small space, with considerable black thickness.
 White 'c' and 'd' are not recommended.
 After White tenukis 'e', Black closes the corner.
 If there is one more additional Black stone on or near the marked point, White must play differently. For this case, see the variation, where a Black stone on the 3-10-point of the top site is included first.
 ]MA[qj]
 (;W[re]LB[qd:A][rd:B]C['a' or 'b'.]
 (;B[qd]
 ;W[rd]
 ;B[rc]
 ;W[rb]
 ;B[qc]
 ;W[qh])
 (;B[rd]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]
 ;W[od]
 ;B[pc]
 ;W[pe]))
 (;W[qc]C[White 4 leaves White with a small corner.]
 ;B[qd]LB[pc:a][rd:b]C[White 'b' starts a ko. White 'a' leads to death in the corner.]
 (;W[pc]C[White 6 can lead to loss of the game, as White cannot live in the corner.]
 ;B[oc]LB[ob:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[re]
 ;W[rc]LB[pb:b][qf:a]C['a' lets White live, 'b' tries to kill, but may just drive White out.]
 (;B[qf]
 ;W[ob]
 ;B[nb]
 ;W[pb])
 (;B[pb]LB[qe:B][rf:A]C[White flees on 'a'. 'b' is an overplay.]
 (;W[rf]
 ;B[qe]
 ;W[se])
 (;W[qe]
 ;B[rf]
 ;W[qb]
 ;B[ob]
 ;W[sb]
 ;B[ra]C[Unless White can make something with 12, White in the corner is dead.])))
 (;W[ob]C[White 8 is a fatal mistake.]
 ;B[nb]
 ;W[pa]LB[rc:B][rd:A]C['a' and 'b' kill, but 'b' gives a stone outside.]
 (;B[rd]LB[qb:B][rb:A]C['a' or 'b' don't help.]
 (;W[rb]
 ;B[na]LB[oa:A][qa:B][ra:C][sb:D]C[White dies after 'a' to 'd'.]
 (;W[oa]
 ;B[qa]
 ;W[pb]
 ;B[rc])
 (;W[qa]
 ;B[rc]
 ;W[sb]
 ;B[pb]LB[oa:A][qb:B]C['a' or 'b' don't help.]
 (;W[oa]
 ;B[qb])
 (;W[qb]
 ;B[oa]))
 (;W[ra]
 ;B[oa]LB[pb:A][sb:B]C['a' or 'b' don't help.]
 (;W[pb]
 ;B[sb])
 (;W[sb]
 ;B[pb]))
 (;W[sb]
 ;B[ra]
 ;W[qa]
 ;B[pb]))
 (;W[qb]
 ;B[rb]
 ;W[rc]
 ;B[sc]))
 (;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pb]
 ;B[sb]
 ;W[rd]
 ;B[ra])))
 (;W[rd]C[White 5 starts a ko.]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc]C[Black has first capture of the ko.
 If White loses the ko, it will be difficult for White to make territory in this part of the board.]))
 (;W[qf]LB[qd:b][rd:a]C[White 4 is the standard approach move. Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[qi])
 (;B[qd]
 ;W[qi]))
 (;W[qd]LB[qc:b][qe:a]C[White 3 is not recommended.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qe]LB[pc:a][qc:c][re:b]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[pc]
 ;B[od]LB[qc:B][rc:A][rd:C]C[White lives on 'a', less big on 'b' or 'c'.]
 (;W[rc]
 ;B[re]
 ;W[ob]
 ;B[nb]
 ;W[qb])
 (;W[qc]
 ;B[re]LB[ob:b][sb:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sb]
 ;B[ob]
 ;W[ra])
 (;W[ob]C[White 9 is a mistake.]
 ;B[sb]
 ;W[nb]
 ;B[mb]))
 (;W[rd]
 ;B[re]
 ;W[qb]
 ;B[ob]
 ;W[sb]LB[ra:b][pb:a]C['a' and 'b' are miai.]
 (;B[pb]
 ;W[ra])
 (;B[ra]
 ;W[pb]
 ;B[rc]
 ;W[rb])))
 (;W[re]LB[qc:A][rd:B][pe:C]C['a', 'b' or 'c' are ok.]
 (;B[qc]
 ;W[rd]LB[rc:B][qf:A]C['a' or 'b'.]
 (;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[qb]
 ;B[pc]
 ;W[rc]
 ;B[pb]
 ;W[qa])
 (;B[rc]
 ;W[pe]
 ;B[qf]
 ;W[pc]
 ;B[od]
 ;W[rf]LB[pb:B][qg:A]C['a' goes outside, 'b' keeps the corner.]
 (;B[qg]
 ;W[pb]
 ;B[qb]
 ;W[ra]LB[qa:A][sb:B]C['a' or 'b' fail.]
 (;B[qa]
 ;W[sc]
 ;B[pa]
 ;W[oa])
 (;B[sb]
 ;W[qa]
 ;B[ob]
 ;W[sd]
 ;B[oc]
 ;W[pa]
 ;B[oa]
 ;W[sc]))
 (;B[pb]
 ;W[qg])))
 (;B[rd]
 ;W[qc]
 ;B[rc]
 ;W[pe]
 ;B[qf]
 ;W[pc]
 ;B[od]
 ;W[rf]LB[rb:A][qg:B]C['a' keeps the corner, 'b' takes influence.]
 (;B[rb]
 ;W[qg]
 ;B[pf]
 ;W[pg]
 ;B[of]
 ;W[pk])
 (;B[qg]
 ;W[rb]
 ;B[rg]
 ;W[sc]))
 (;B[pe]
 ;W[rd]
 ;B[rf]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[qg]
 ;W[dp]
 ;B[rb]
 ;W[rc]
 ;B[qb]
 ;W[sb]
 ;B[ra]
 ;W[qc]
 ;B[se]
 ;W[sd]
 ;B[pa]
 ;W[ob]
 ;B[nb]
 ;W[oa]
 ;B[sf]
 ;W[qa]))
 (;W[qc]C[White 5 is a mistake.]
 ;B[re]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]
 ;W[rb]
 ;B[rd]C[Black 12 prevents White from getting two eyes.]))
 (;B[qc]C[Black 5 is not recommended.]
 ;W[qe]
 ;B[rc]
 ;W[qh]))
 (;W[]LB[rd:B][qe:A][qf:C]TR[qg][qh][qi][qj][qk]C['a' or 'b' are usual.
 'c' secures more territory, but is almost always bad: if there are White stones on the sides nearby, a fatal cut is left, if there are no White stones nearby, a placement of a White stone is sente to use that aji and makes Black overconcentrated.
 Adding a Black stone on any of the triangled points is wrong.
+]
 (;B[qe])
 (;B[rd])
 (;B[qf]
 ;W[qc]LB[qd:B][re:A]C['a' kills, 'b' is a mistake, only ko.
+]
 (;B[re]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[od]
 ;W[rb]
 ;B[oa]
 ;W[pb]
 ;B[sc]
 ;W[sb]
 ;B[qa]
 ;W[pa]
 ;B[ra]LB[nd:A]C[White aji on 'a':
+]
 ;AW[jc][qj]LB[qf:5]C[If White is strong, Black 5 was wrong.
+]
 ;W[nd]
 ;B[lc]
 ;W[ne]
 ;B[le]
 ;W[qd]
 ;B[qe]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[of]
 ;W[pg])
 (;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[sc]))))
 (;B[jd]LB[qc:B][qf:A][dp:C]C[White 'a', 'b' or tenuki.]
 (;W[qf]LB[nd:A][qh:B]C['a' or 'b'.
+]
 (;B[nd]
 ;W[rd]
 ;B[pg]
 ;W[pf]
 ;B[qg]
 ;W[of]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[qc]
 ;W[qd]
 ;B[qb]
 ;W[nc]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nb]
 ;B[md]
 ;W[pb]
 ;B[ng]
 ;W[nf]
 ;B[mf]C[Later, taking an outside liberty is sente for Black.])
 (;B[qh]
 ;W[nc]
 ;B[qc]
 ;W[ph]
 ;B[pi]
 ;W[pg]
 ;B[ne]
 ;W[qi]
 ;B[qj]
 ;W[ri]
 ;B[pj]
 ;W[rh]))
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[qb]
 ;W[rb]
 ;B[rf]
 ;W[pe]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[qa])
 (;W[]LB[qh:C][pi:B][pj:A]C[White plays elsewhere.
 'a', 'b' or 'c'.]
 (;B[pj]LB[nc:b][qc:a][pf:c]C[White approaches with 'a' to 'c'.]
 (;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]LB[nb:b][nc:a]C[Black continues with 'a' or 'b'.]
 (;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;B[nb]LB[nc:a][od:c][rd:b]C[White continues with 'a' or 'b'.
 'c' is questionable.]
 (;W[nc]
 ;B[od]LB[mb:a][pb:b]C[White continues with 'a'. White can also play 'b' and live in the corner.]
 (;W[mb]LB[pb:b][nd:a]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[na]
 ;B[mc]
 ;W[nb]LB[lc:a]C[Black extending at 'a' is good, but most often Black plays elsewhere.])
 (;B[pb]
 ;W[na]
 ;B[qb]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[mf]LB[mg:B][ng:A]C['a' is correct. 'b' is a mistake.]
 (;B[ng])
 (;B[mg]
 ;W[ng]LB[pf:A][mh:B]C['a' is necessary, 'b' is another mistake.]
 (;B[pf])
 (;B[mh]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[re]
 ;W[oe]
 ;B[of]
 ;W[pf]
 ;B[pe]
 ;W[og]
 ;B[oe]
 ;W[qe]))))
 (;W[pb]LB[mb:a][mc:b]C[White 14 let White live in the corner. Given Black's overwhelming thickness, this may not be such a good idea.
 Black continues with 'a' or 'b'.]
 ;B[mb]LB[md:b][rd:a]C[White continues with 'a'. Anywhere else, such as White 'b', is a mistake.]
 (;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc])
 (;W[md]C[White cannot afford to play anywhere other than the corner.]
 ;B[rb]
 ;W[rc]
 ;B[rd]
 ;W[sc]
 ;B[ra]
 ;W[qa]
 ;B[oa])))
 (;W[rd]
 ;B[re]
 ;W[qe]LB[rc:A][od:A][pe:B]C['a' to take the corner, 'b' to stay outside.]
 (;B[od]
 ;W[rf]
 ;B[rc]
 ;W[se]
 ;B[rb]
 ;W[qh])
 (;B[pe]
 ;W[rc]
 ;B[nd]
 ;W[pb]))
 (;W[od]C[White 'c' shows a special strategy to keep the corner; not necessarily a wise strategy considering the overwhelming thickness Black already has.]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]
 ;B[qf]
 ;W[pb])))
 (;W[nc]LB[oc:a][pf:b]C[Black continues with 'a'. Black 'b' is too easygoing.]
 (;B[oc]
 ;W[nd]
 ;B[pf]LB[jb:b][kc:c][lc:d][ld:a]C[White continues with 'a'. White 'b' to 'd' are not recommended.]
 (;W[ld]LB[kc:a][jf:b]C[Black continues with 'a'. Black 'b' lacks force.]
 (;B[kc]
 ;W[je]C[White 10 is one possible continuation.]
 ;B[ie]
 ;W[jf]
 ;B[kd]
 ;W[ke]
 ;B[lc]
 ;W[nf])
 (;B[jf]C[Black 9 lacks force, and gives White the chance to settle his group.]
 ;W[jc]
 ;B[ic]
 ;W[jb]
 ;B[ib]
 ;W[kd]
 ;B[je]
 ;W[ob]
 ;B[pb]
 ;W[nb]))
 (;W[jb]C[White 8 is feasible, but White gets a low position.]
 ;B[jc]
 ;W[kb]
 ;B[ib]
 ;W[lc]
 ;B[ob]C[With Black 13, White is still not settled.])
 (;W[kc]C[White 8 is not recommended in this situation.]
 ;B[jc]
 ;W[kd]LB[je:a][ke:b]C[Black continues with 'a' or 'b'.]
 ;B[ke]C[The old proverb: at the head of two stone, hane.]
 ;W[jb]
 ;B[ib]
 ;W[kb]
 ;B[je]C[White can barely make life, and has given Black wonderful thickness.])
 (;W[lc]C[White 8 is small, low, and easily blocked. White should emphasize instead jumping to the center for life.]
 ;B[kc]))
 (;B[pf]C[Black 5 is too sedate.]
 ;W[pb]
 ;B[qc]
 ;W[lc]))
 (;W[pf]
 ;B[nd]
 ;W[qh]LB[qe:b][qi:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qi]
 ;W[ph]
 ;B[nj]
 ;W[rd]LB[qc:a][qe:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qc]
 ;W[rc]
 ;B[qe]C[Black 13 is a continuation which is not recommended until Black has a more solid position locally. As is, Black 13 is an overplay.]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rh]
 ;B[qg]
 ;W[sg]
 ;B[qb]C[White does not have two eyes, but Black also has weaknesses in his position. Hence, Black should only play this continuation after fortifying his local position.])
 (;B[qe]C[Black 11 is a mistake.]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rh]))
 (;B[qe]LB[qf:b][rj:a]C[Black 7 is not recommended.
 White slides with 'a'. White 'b' is too submissive.]
 (;W[rj]
 ;B[qf]LB[qj:a][pk:b]C[White 'a' are 'b' are possible continuations.])
 (;W[qf]C[White 8 is submissive.]))))
 (;B[pi]
 ;W[pf]
 ;B[nd]
 ;W[qd]
 ;B[qc]
 ;W[qe]
 ;B[rc]
 ;W[nf]
 ;B[qg]C[Black aims for a connection.]
 ;W[oh]
 ;B[pg]
 ;W[og]
 ;B[re]
 ;W[rd]
 ;B[sd]
 ;W[rf]
 ;B[qf]
 ;W[pe]
 ;B[se]
 ;W[pc]
 ;B[od]
 ;W[ob]
 ;B[oc]
 ;W[pb]
 ;B[qb]
 ;W[ph]
 ;B[qh]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[rg]
 ;W[oj]LB[ob:26][pb:28][pc:24]C[Black has territory and the connection, White has influence.
 After he secured his center group he can still activate the 24-26-28-group.])
 (;B[qh]
 ;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[qf]
 ;W[rf]
 ;B[pe])))
 (;B[nd]LB[qc:a][qd:b][dp:c]C[
 -Space Jump = Ikken Tobi = Hankan Ddwim = Yi Tiao`
 ----------------------------------------------------
 A White single-handed 3-3 invasion is unusual, but possible.
 White continues with 'a' or 'b'.
 Tenuki 'c' is also possible.
+]
 (;W[qc]LB[pc:b][qd:a]TR[jc]C[There are similar variations like these, when Black has an additional stone at the marked location included before the one on the 6-4-point.
 Black continues with 'a' or 'b'.]
 (;B[qd]
 ;W[pb]
 ;B[pc]
 ;W[rb]LB[ob:a][rc:b]C[Black continues with 'a' or 'b'.]
 (;B[ob]
 ;W[rd]
 ;B[re]
 ;W[qa]
 ;B[sd]
 ;W[rc])
 (;B[rc]
 ;W[qb]LB[ob:b][rd:a]C[Black continues with 'a' to perfect thickness. Black 'b' gives White a stone with no compensation for Black.]
 (;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[sb]
 ;B[nc]
 ;W[ob])
 (;B[ob]C[Black 10 gives White a stone with no compensation for Black.]
 ;W[rd]
 ;B[re]
 ;W[sc])))
 (;B[pc]
 ;W[qd]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[pb]
 ;B[ob]
 ;W[qb]))
 (;W[qd]LB[qc:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]LB[qc:a][re:b]C[White continues with 'a' or 'b'.]
 (;W[qc]LB[pc:b][re:a]C[Black continues with 'a'. Black 'b' is not generally recommended.]
 (;B[re]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[od]
 ;B[oe]
 ;W[pc]
 ;B[pe]
 ;W[rd])
 (;B[pc]C[Black 6 is generally not recommended.]
 ;W[re]LB[qf:b][rf:a]C[Black plays 'a' to take the corner or 'b' for thickness.]
 (;B[rf]
 ;W[qf]
 ;B[pe]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]
 ;W[ph])
 (;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[pb]
 ;B[ob]
 ;W[qb])))
 (;W[re]
 ;B[pe]LB[qc:a][rd:b]
 (;W[qc]
 ;B[rf]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[rd]
 ;B[qg])
 (;W[rd]
 ;B[rf]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[qg]CR[rb]C[White next plays at the marked location, the vital point. White risks a ko otherwise.]
 ;W[]CR[rb]C[White plays elsewhere. Black can get a ko.]
 ;B[rb]LB[qb:b][rc:a]C[White continues with 'a'. White 'b' is not recommended, as it lacks the aji the results from playing 'a'.]
 (;W[rc]
 ;B[qb]
 ;W[sb]
 ;B[ra]
 ;W[qc]
 ;B[se]
 ;W[sd]
 ;B[pa]
 ;W[ob]
 ;B[nb]LB[oa:a][sf:b]C[White continues with 'a' or 'b'.]
 (;W[oa]
 ;B[sf]CR[na]C[The liberty at the marked point must be filled before the White group is faced with a life-and-death ko.])
 (;W[sf]LB[oa:a][sg:b]C[White threatens to escape down the side.
 Black can pull his stones out 'a', or block White with 'b'.]
 (;B[oa]
 ;W[rg]
 ;B[qf]
 ;W[rh])
 (;B[sg]
 ;W[oa]CR[na]C[Now White faces an approach move double ko (the marked point being the approach move).])))
 (;W[qb]C[White 14 is not recommended, as White ends up lacking the aji of the other variation.]
 ;B[rc]
 ;W[ra]
 ;B[sb]
 ;W[qc]
 ;B[ob]
 ;W[pa]
 ;B[sd]
 ;W[se]))))
 (;B[qc]TR[jc]C[For continuation see the variation with an additional Black stone on the triangled position included first.]))
 (;W[dp]
 ;B[pj]LB[qd:B][qf:A]C['a' leads to ko on the side. 'b' results in life in the corner.]
 (;W[qf]
 ;B[pg]
 ;W[pf]
 ;B[og]
 ;W[of]
 ;B[nf]
 ;W[ng]
 ;B[nh]
 ;W[mg]
 ;B[mf]
 ;W[mh]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[re]LB[rd:A][sg:B]C['a' leads to ko. White lives with 'b'.]
 (;B[rd]LB[qd:A][qi:B]C['a' leads to ko. White dies with 'b'.]
 (;W[qd]
 ;B[qc]
 ;W[pe]
 ;B[oe]
 ;W[rc])
 (;W[qi]
 ;B[qh]
 ;W[pi]
 ;B[ri]
 ;W[qj]
 ;B[rj]
 ;W[qk]
 ;B[qe]))
 (;B[sg]
 ;W[rf]
 ;B[qi]
 ;W[qc]
 ;B[pc]
 ;W[qb]
 ;B[ni]))
 (;W[qd]
 ;B[qe]LB[pc:B][qc:C][re:A]C['a' or 'b' give Black the choice where White lives.
 'c' gives Black too much thickness.]
 (;W[re]LB[qc:A][pe:B]C['a' White lives on the right side.
 'b' White corner with an approach move ko.]
 (;B[qc]
 ;W[rd]
 ;B[qf]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[qb]
 ;W[pe]
 ;B[od]
 ;W[rb]
 ;B[ob]
 ;W[rc]
 ;B[pa]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh])
 (;B[pe]
 ;W[rd]
 ;B[rf]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[rb]C[Later Black can start this approach move ko.]
 ;W[rc]
 ;B[qb]
 ;W[sb]
 ;B[ra]
 ;W[qc]
 ;B[se]
 ;W[sd]
 ;B[pa]
 ;W[ob]
 ;B[nb]
 ;W[oa]
 ;B[sf]
 ;W[qa]))
 (;W[pc]LB[oc:B][od:A]C['a' White lives on the top.
 'b' White lives on the right.]
 (;B[od]
 ;W[rc]
 ;B[re]
 ;W[nb])
 (;B[oc]
 ;W[pe]
 ;B[od]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[qc]
 ;W[rd]
 ;B[qg]
 ;W[pb]
 ;B[qb]
 ;W[rb]
 ;B[ob]
 ;W[rc]
 ;B[pa]
 ;W[rg]
 ;B[qh]))
 (;W[qc]
 ;B[re]
 ;W[ob]
 ;B[nb]
 ;W[oc]
 ;B[nc]
 ;W[od]
 ;B[oe]
 ;W[pc]
 ;B[pe]
 ;W[rd]))))
 (;B[pp]LB[qj:b][cq:a]C[
 Ni-Ren-Sei = I-Yeon-Seong = E`r-Lia´n-Xing = Two Star Points
 -------------------------------------------------------------
 This variation demonstrates joseki in the san-ren-sei and ni-ren-sei fuseki.
 'a' = san-ren-sei (three star points)
 'b' = ni-ren-sei (two star points)
+]
 (;W[]C[White plays elsewhere.]
 ;B[pj]LB[nc:a][qc:c][qf:b]C[
 Three Star Points = San-Ren-Sei = Sam-Yeon-Seong = San-Lia´n-Xing
 ------------------------------------------------------------------
 White approaches at 'a'. Approaching at 'b', where Black is strong,
 is not recommended. Invading at 'c' immediately is not recommended.
 For 'c', see the variation of the invasion onto the 3-3-point behind the Hoshi without additional stones.
+]
 (;W[nc]LB[lc:c][jd:e][kd:d][nd:a][ne:f][pf:b]C[Black continues with 'a' to 'e'. 'a' is not recommended for Black.
 For 'c', see 'c' here and the same variation without the additional Black stones.
 For 'd' and 'e', see the same variations without the additional Black stones.]
 (;B[nd]C[This is not recommended for Black.]
 ;W[md]
 ;B[ne]LB[ob:c][oc:a][pc:b]C[White continues with 'a' to 'c'.]
 (;W[oc]
 ;B[pc]
 ;W[jc])
 (;W[pc]LB[oc:a][qc:b]C[Black continues with 'a' or 'b'.]
 (;B[oc]
 ;W[ob]
 ;B[od]
 ;W[mb]
 ;B[qc]
 ;W[pb]
 ;B[me]
 ;W[ld])
 (;B[qc]
 ;W[ob]
 ;B[pb]
 ;W[oc]
 ;B[qb]
 ;W[jc]
 ;B[pf]))
 (;W[ob]
 ;B[pc]
 ;W[jc]))
 (;B[pf]LB[pb:a][jd:b]C[White continues with 'a' or 'b'.]
 (;W[pb]
 ;B[qc]
 ;W[kc])
 (;W[jd]))
 (;B[lc]LB[qc:b][ld:a][qf:c]C[White continues with 'a' or 'b'. 'c' is also possible, depending upon the whole board.
+]
 (;W[ld]
 ;B[kd]
 ;W[md]LB[jc:a][pf:b]C[Black continues with 'a' or 'b'.]
 (;B[jc]LB[ke:a][lf:A][pf:b]C[White continues with 'a' or tries 'b'.]
 (;W[lf]
 ;B[pf]
 ;W[ke]
 ;B[je]
 ;W[jf])
 (;W[pf]
 ;B[oe]
 ;W[lf]
 ;B[of]
 ;W[ke]
 ;B[je]
 ;W[jf]
 ;B[ie]
 ;W[ph]))
 (;B[pf]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jd]
 ;W[lb]
 ;B[oc]))
 (;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[od]LB[nb:a][rc:b]C[White continues with 'a' or 'b'.]
 (;W[nb]
 ;B[me])
 (;W[rc]
 ;B[nd]
 ;W[nb]
 ;B[rd]))
 (;W[qf]
 ;B[qc]
 ;W[ld]
 ;B[kd]
 ;W[md]
 ;B[of]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jd]
 ;W[lb])))
 (;W[qf]LB[nd:B][qe:A]C[The inside approach move is not recommended, as White is starting a fight where Black is strongest.
 This does however demonstrate a high handicap joseki.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qe]
 ;W[pf]LB[nc:B][nd:A]C['a' is correct, 'b' is not recommended.
+]
 (;B[nd]LB[ph:a][qh:c][qi:d][rj:b]C[White may try 'a', 'b' or 'c'.
 'd' is a special case joseki, if White has the lower side.
+]
 (;W[ph]LB[ni:C][qi:B][qj:A]C['a' is correct. 'b' is possible. 'c' is completely wrong, because White can live near the edge.
+]
 (;B[qj]
 ;W[mg]
 ;B[mi]
 ;W[kg]
 ;B[me]
 ;W[mf]
 ;B[ki])
 (;B[qi]LB[mg:C][ni:B][oj:A]C['a' or 'b' give White a more broad standing, 'c' doesn't.
+]
 (;W[oj]
 ;B[ok]
 ;W[nj]
 ;B[pi]
 ;W[oi]
 ;B[qh]
 ;W[nf]
 ;B[pg]C[Mistake.
+]
 ;W[og]
 ;B[oh]
 ;W[nh]C[White pushed into nice shape.
 ])
 (;W[ni]
 ;B[nj]
 ;W[mj]
 ;B[nk]
 ;W[mi]
 ;B[mk])
 (;W[mg]
 ;B[nj]C[The joseki ends here.
 The continuation shows a White invasion in the corner. This should
 not be attempted as long as the White outside group is weak.]
 ;W[qc]
 ;B[re]
 ;W[oc]
 ;B[od]LB[nb:B][nc:A][pc:C]C[White can live with 'a', 'b' or 'c'.]
 (;W[nc]LB[mc:A][pc:B]TR[jc]C['a' or, with an additional stone on the triangled position, 'b'.]
 (;B[mc]
 ;W[mb]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[ob]
 ;B[rc]LB[kc:B][lc:A]C['a' or 'b'.]
 (;W[lc]
 ;B[md])
 (;W[kc]))
 (;AB[jc]
 ;B[pc]
 ;W[pb]
 ;B[mc]LB[mb:A][rb:B]C['a' lives on the side, 'b' in the corner.]
 (;W[mb]LB[mc:21][pc:19]C[This reverts to the variation where 21 is played before 19.])
 (;W[rb]
 ;B[mb]
 ;W[oa])))
 (;W[nb]LB[nc:A][pc:B]C['a' closes in the corner from the top side.
 'b' pushes White to the top side.]
 (;B[nc]
 ;W[ob]
 ;B[mb]
 ;W[rc])
 (;B[pc]
 ;W[pb]
 ;B[nc]
 ;W[ob]
 ;B[rc]
 ;W[rb]
 ;B[qd]
 ;W[qb]
 ;B[sb]
 ;W[lc]))
 (;W[pc]
 ;B[nc]LB[nb:B][rb:A]C['a': White lives. 'b': White dies.]
 (;W[rb])
 (;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[sb]))))
 (;B[ni]
 ;W[rj]LB[qi:B][qk:A]C['a' encloses, 'b' fails to kill.
+]
 (;B[qk]
 ;W[rk]
 ;B[qm])
 (;B[qi]
 ;W[ri]
 ;B[qh]
 ;W[rh])))
 (;W[rj]LB[rh:b][qi:c][qj:a][rk:d]C[Black continues with 'a' or 'b'. Black 'c' and 'd' are mistakes.
+]
 (;B[qj]LB[ri:a][rk:b]C[White continues with 'a'. White 'b' doesn't work.]
 (;W[ri]
 ;B[rk]LB[ph:B][qh:A]C['a' is correct. 'b' is a mistake.
+]
 (;W[qh])
 (;W[ph]
 ;B[qi]LB[qh:B][rh:A]C['a' is correct. 'b' is a mistake.]
 (;W[rh]
 ;B[re])
 (;W[qh]
 ;B[rg])))
 (;W[rk]C[White 11 is a mistake.]
 ;B[ri]
 ;W[qi]
 ;B[rh]LB[rg:A][qh:B]C['a' or 'b' don't help.]
 (;W[rg]
 ;B[qh]
 ;W[pi]
 ;B[oi]
 ;W[ph]
 ;B[pg]
 ;W[oh]
 ;B[og]
 ;W[nh]
 ;B[qg])
 (;W[qh]
 ;B[rg])))
 (;B[rh])
 (;B[qi]C[Black 10 is a mistake.]
 ;W[ri]
 ;B[rh]
 ;W[qh]LB[qg:a][rg:b]C[Black possibilities are 'a' and 'b'.]
 (;B[qg]
 ;W[rg]
 ;B[ph]
 ;W[sh]
 ;B[qh]
 ;W[re]
 ;B[rd])
 (;B[rg]
 ;W[pk]
 ;B[ph]
 ;W[qj]
 ;B[pi]
 ;W[qn]))
 (;B[rk]
 ;W[qk]
 ;B[qj]
 ;W[rl]
 ;B[ri]
 ;W[sk]))
 (;W[qh]
 ;B[qi]
 ;W[ph]
 ;B[nj]
 ;W[mg]
 ;W[rg]C[Later White can live here.]
 ;B[re]
 ;W[ri]
 ;B[rj]
 ;W[sh])
 (;AW[dp][jp][nq]
 ;W[qi]
 ;B[qj]
 ;W[pi]
 ;B[oi]
 ;W[oh]
 ;B[nh]
 ;W[rj]
 ;B[rk]
 ;W[qk]LB[oj:B][pk:A]C['a' is correct, 'b' is nonsense.
+]
 (;B[pk]
 ;W[ri]
 ;B[ql]
 ;W[ni]
 ;B[oj]
 ;W[og])
 (;B[oj]
 ;W[rl]
 ;B[ri]
 ;W[sk]
 ;B[rh]
 ;W[qg])))
 (;AW[dp]C[It is likely that White has the ladder.
+]
 ;B[nc]
 ;W[od]C[White prepares the punishment.
+]
 ;B[oc]
 ;W[qc]LB[pc:A][qd:C][pe:B][re:D]C['a' or 'b' are possible, 'c' is not recommended, 'd' is wrong.
+]
 (;B[pc]
 ;W[re]
 ;B[qd])
 (;B[pe]
 ;W[oe]
 ;B[rf]
 ;W[pc]
 ;B[rd])
 (;B[qd]
 ;W[pc])
 (;B[re]
 ;W[pc]
 ;B[pe]
 ;W[oe]
 ;B[rf]
 ;W[rg]
 ;B[of]
 ;W[md])))
 (;B[nd]C[White 6 is a mistake.]
 ;W[rd]
 ;B[qc]
 ;W[qh]C[White easily lives.])))
 (;W[qj]C[White 3 is a flexible invasion.]
 ;B[ql]LB[qf:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[qf]LB[mc:c][nc:d][nd:a][qh:b]C[Black continues with 'a', 'b', 'c' or 'd'.]
 (;B[nd]
 ;W[rd]LB[qc:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[ph])
 (;B[qh]
 ;W[qc]
 ;B[pc]LB[qg:c][ph:b][rh:a]C[White continues with 'a' to 'c'.]))
 (;B[qh]LB[of:a][rh:b]C[White continues with 'a' or 'b'.]
 (;W[of]LB[nc:B][nd:A][pi:C]C['a' or 'b' are ok.
 'c' is not recommended.]
 (;B[nd]LB[nd:9][rd:B][pi:A]TR[nc]C['a' is correct, 'b' is a mistake with Black 9 played here and not onto the triangled point.]
 (;W[pi]LB[rd:A][qe:B]C['a' is correct, 'b' is inferior.]
 (;B[rd]LB[lc:B][ph:A]C['a' gives a clear result, 'b' leads to a difficult fight.]
 (;W[ph]
 ;B[kc])
 (;W[lc]
 ;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[oj]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[rk]
 ;B[qk]
 ;W[sj]
 ;B[pj]))
 (;B[qe]C[Black 10 limits White's incursion into the corner.]
 ;W[rf]C[Black 6 still has considerable aji.]
 ;B[kc]
 ;B[ph]C[Later]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[oj]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[rj]
 ;W[rk]
 ;B[qk]
 ;W[sj]
 ;B[pj]))
 (;W[rd]
 ;B[oh]
 ;W[qc]
 ;B[nf]))
 (;B[nc]LB[rd:B][pi:A]C['a' secures taking the side, 'b' takes more territory on the
 side or enters the corner.]
 (;W[pi]
 ;B[rd]
 ;W[ph])
 (;W[rd]LB[qc:B][pi:A]C['a' is correct, 'b' is inferior.]
 (;B[pi]
 ;W[qc]
 ;B[kc]LB[pj:A][qn:B]C['a' is correct, 'b' is questionable.]
 (;W[pj]
 ;B[ni]
 ;W[oj]
 ;B[ng]
 ;W[pl]LB[pm:B][qm:A]C['a' or 'b'.]
 (;B[qm]LB[mk:A][pm:B]C['a' or 'b'.]
 (;W[mk]
 ;B[nf]LB[dd:A][ph:D][dp:B][jp:C]C[With two white stones on 'a' and 'b', White now wants to occupy 'c' to help his running group.
 Later, if necessary, White can connect his two groups on 'd'.]
 ;W[ph]
 ;B[pg]
 ;W[rh])
 (;W[pm]
 ;B[pn]
 ;W[on]
 ;B[po]
 ;W[mk]))
 (;B[pm]
 ;W[om]
 ;B[ol]
 ;W[nl]
 ;B[pk]
 ;W[ok]
 ;B[pl]
 ;W[mk]))
 (;W[qn]
 ;B[qq]
 ;W[pj]
 ;B[pm]))
 (;B[qc]
 ;W[pi])))
 (;B[pi]
 ;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[oc]
 ;W[md]
 ;B[rd]
 ;W[id]LB[pj:A][qn:B]C[White later continuations on 'a' or 'b'.]))
 (;W[rh]LB[nc:a][rg:c][ri:b]C[Black continues with 'a' to 'c'. Black 'a' is peaceful; 'b' is a fighting move.]
 (;B[nc]
 ;W[ph]
 ;B[qe]
 ;W[pf]
 ;B[rf]
 ;W[rg]LB[rd:A]C[Later, White can live on 'a'.]
 ;W[rd]
 ;B[re]
 ;W[qc]LB[pb:B][pc:A]
 (;B[pc]
 ;W[rb]
 ;B[pb]
 ;W[qd]
 ;B[pe]
 ;W[sc])
 (;B[pb]
 ;W[pc]
 ;B[oc]
 ;W[qb]
 ;B[ob]
 ;W[sd]LB[rb:B][qd:A]
 (;B[qd]
 ;W[rb]
 ;B[qa]
 ;W[ra])
 (;B[rb]
 ;W[se]
 ;B[sf]
 ;W[pe]
 ;B[qd]
 ;W[od]
 ;B[rc]
 ;W[sg])))
 (;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[pg]
 ;B[pf]
 ;W[rf]
 ;B[sh]
 ;W[qd]
 ;B[pe]
 ;W[qc]
 ;B[rj]
 ;W[pc]
 ;B[nd]
 ;W[oj])
 (;B[rg]
 ;W[qg]
 ;B[ri]LB[rf:A][ph:B]C['a' makes a living group in the corner, 'b' influence.]
 (;W[rf]
 ;B[qi]
 ;W[qd]
 ;B[qc]
 ;W[pc]
 ;B[od]
 ;W[pb]
 ;B[mc]LB[qb:A][rd:B]C['a' or 'b'.]
 (;W[qb]
 ;B[og])
 (;W[rd]
 ;B[og]))
 (;W[ph]
 ;B[qi]
 ;W[pi]
 ;B[rj]
 ;W[rf]CR[pg]LB[mc:a]C[Black must now decide; Black 'a' is possible, as are other moves.
 White must defend against the cut at the marked point.]))))
 (;B[mc]LB[qc:C][rd:A][dp:B]C['a' is correct. tenuki 'b' is also possible.
 'c' is a mistake.]
 (;W[rd]LB[qc:B][qh:A]C['a' is ok, 'b' is possible, but gives White a very good shape.
+]
 (;B[qh]
 ;W[of]
 ;B[pi]LB[oc:C][pc:A][qg:B]C['a' or 'b'.
 'c' is a mistake.]
 (;W[pc]
 ;B[oc]
 ;W[qc]
 ;B[oe]
 ;W[nf]
 ;B[jc]LB[re:A]C[Later, Black wants to play 'a'.])
 (;W[qg]LB[qc:A][rg:C][rh:B]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[qc]
 ;W[rh]
 ;B[pj])
 (;B[rh]
 ;W[oc]
 ;B[od]
 ;W[pc]
 ;B[qd]
 ;W[qc]
 ;B[re]
 ;W[nd]
 ;B[nc]
 ;W[rc]
 ;B[qe]
 ;W[md]
 ;B[lc]
 ;W[ld]LB[kc:A][sf:B]C['a' and a cut near 'b' are miai.]
 (;B[kc]
 ;W[rf])
 (;B[sf]
 ;W[kc]
 ;B[kb]
 ;W[jb]
 ;B[jc]
 ;W[kd]))
 (;B[rg]LB[oc:A][rf:B]C['a' is correct. 'b' is a mistake.]
 (;W[oc]LB[od:B][rf:A]C['a' saves few points. 'b' leads to a disaster.]
 (;B[rf]
 ;W[od]
 ;B[pe]
 ;W[oe]
 ;B[qe]
 ;W[pc]
 ;B[pf]
 ;W[jc])
 (;B[od]
 ;W[pc]
 ;B[qd]
 ;W[qc]
 ;B[re]
 ;W[nd]
 ;B[nc]
 ;W[rc]
 ;B[qe]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[rf]
 ;B[sf]
 ;W[rh]
 ;B[sg]
 ;W[ph]
 ;B[qi]
 ;W[ri]))
 (;W[rf]
 ;B[qc]
 ;W[rh]
 ;B[ri]
 ;W[sg]
 ;B[qi])))
 (;W[oc]
 ;B[pc]
 ;W[od]
 ;B[pe]
 ;W[oe]
 ;B[pf]
 ;W[pg]
 ;B[qg]))
 (;B[qc]
 ;W[ph]))
 (;W[dp]LB[qd:A][qh:B]C['a' or 'b'.]
 (;B[qd]
 ;W[ph])
 (;B[qh]
 ;W[rh]LB[rg:A][qi:B][ri:C]C['a' or 'b'. 'c' is a mistake.]
 (;B[rg]
 ;W[qg]
 ;B[ri]
 ;W[rf]
 ;B[qi]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]C[
 * Joseki *])
 (;B[qi]
 ;W[ri]
 ;B[pj]
 ;W[qk]
 ;B[pk]
 ;W[rl]
 ;B[rm]
 ;W[pi]
 ;B[ph]
 ;W[pl]
 ;B[qm]
 ;W[oi]
 ;B[ok]LB[pe:B][oh:A]C['a' or 'b'.]
 (;W[oh]
 ;B[pg]
 ;W[of]
 ;B[pf]
 ;W[pe]
 ;B[oe]
 ;W[qe]
 ;B[og]
 ;W[od]
 ;B[nf]
 ;W[pc]
 ;B[nd]
 ;W[oc]
 ;B[rg]
 ;W[qg]
 ;B[rj]
 ;W[rk]
 ;B[sj]
 ;W[ng]
 ;B[of]
 ;W[mf]
 ;B[ne])
 (;W[pe]
 ;B[oh]
 ;W[qd]
 ;B[pc]
 ;W[qc]
 ;B[rg]
 ;W[qg]
 ;B[rj]
 ;W[rk]
 ;B[sj]
 ;W[kc]
 ;B[me]))
 (;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[pg]
 ;B[pf]
 ;W[rf]
 ;B[sh]
 ;W[qd]
 ;B[pe]
 ;W[qc]
 ;B[rj]
 ;W[pc]
 ;B[nd]
 ;W[oj])))
 (;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[od]
 ;W[oc]
 ;B[rd]
 ;W[nc]
 ;B[nd]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[qh]))
 (;B[nc]LB[rd:A][of:C][ph:D][oj:B][dp:E]C['a', 'b', 'c' and tenuki 'e' are correct, 'd' is inferior.]
 (;W[rd]LB[qc:B][qh:A]C['a' is ok, 'b' is possible, but gives White a very good shape.
+]
 (;B[qh]
 ;W[of]
 ;B[pi]
 ;W[qc]
 ;B[kc])
 (;B[qc]
 ;W[ph]))
 (;W[oj]
 ;B[qh]
 ;W[pg]
 ;B[rd]
 ;W[ph])
 (;W[of]
 ;B[qh]
 ;W[pi]LB[rd:A][qe:B]C['a' is correct, 'b' is inferior.]
 (;B[rd]
 ;W[ph])
 (;B[qe]
 ;W[rf]
 ;B[kc]))
 (;W[ph]
 ;B[qe]
 ;W[pf])
 (;W[dp]
 ;B[qh]
 ;W[rh]LB[de:C][rg:A][ri:B]C['a'. 'b' and tenuki 'c' are ok.]
 (;B[rg]
 ;W[qg]
 ;B[ri]LB[rf:A][ph:B]C['a' is correct. 'b' is a mistake.]
 (;W[rf]LB[sh:B][qi:A]C['a' is correct. 'b' is a mistake.]
 (;B[qi]
 ;W[qc]
 ;B[qd]
 ;W[rd]
 ;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[kd])
 (;B[sh]
 ;W[ph]
 ;B[qi]
 ;W[pi]
 ;B[rj]
 ;W[qc]
 ;B[qd]
 ;W[rd]C[White has too much: the corner and influence.]))
 (;W[ph]
 ;B[qi]
 ;W[pi]
 ;B[rj]
 ;W[rf]
 ;B[rd]C[White has not gained much.]))
 (;B[ri]
 ;W[qi]
 ;B[rg]
 ;W[ph]
 ;B[qg]
 ;W[pg]
 ;B[pf]
 ;W[rf]
 ;B[sh]LB[qd:A][sf:B]C['a' White takes the corner.
 'b' White makes a large sacrifice to gain more strength on the outside.]
 (;W[qd]
 ;B[pe]
 ;W[qc]
 ;B[rj]
 ;W[oj])
 (;W[sf]
 ;B[sg]
 ;W[rj]
 ;B[qe]
 ;W[of]
 ;B[pe]LB[sj:A][sk:B]C[Later, White 'a', 'b' are sente.]))
 (;B[de]
 ;W[ph]
 ;B[qe]
 ;W[pf]
 ;B[rf]
 ;W[rg]))))
 (;W[qg]LB[nd:A][qe:B]C['a' or 'b'.]
 (;B[nd]
 ;W[rd]CR[rf]C[White must later cover the marked weak point.])
 (;B[qe]LB[mc:A][oj:B]C['a' or 'b'.]
 (;W[mc]
 ;B[oc]
 ;W[jc]
 ;B[oj]
 ;W[og]
 ;B[mg]
 ;W[pk]
 ;B[nl])
 (;W[oj]LB[mc:B][nd:A]C['a' or 'b' are okay.
+]
 (;B[nd]LB[lc:A][qc:B]C['a' or 'b' are okay with support on the top side.]
 (;W[lc]LB[nb:A][nc:C][rf:B]C['a' or 'c' keep the corner, 'b' invites White into the corner to make a strong wall, hurting all White outside stones.]
 (;B[nb]LB[qc:B][rf:A]C['a' is better than 'b'.]
 (;W[rf]
 ;B[re])
 (;W[qc]
 ;B[rd]))
 (;B[rf]LB[nb:A][oc:B]C['a' reduces, 'b' enters.]
 (;W[nb]
 ;B[pb]
 ;W[og])
 (;W[oc]LB[nc:A][pc:B]C['a' starts enclosing, 'b' keeps a reduced corner.]
 (;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rc]
 ;B[qb]
 ;W[qc]
 ;B[pc]
 ;W[pb]
 ;B[rb]
 ;W[ra]
 ;B[qa]
 ;W[sb]
 ;B[sa]
 ;W[sc]
 ;B[na]
 ;W[pa]
 ;B[od]
 ;W[ra]C[Black can now attack the White middle group and build something on the top side. Taking the corner was not worth that.])
 (;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[ob])))
 (;B[nc]
 ;W[qc]LB[pb:A][rd:B]C['a' or 'b'.]
 (;B[pb]LB[re:B][rf:A]C['a' reduces, 'b' makes the Black corner bigger.]
 (;W[rf]
 ;B[re]
 ;W[se]
 ;B[sd]
 ;W[sf]
 ;B[rd]
 ;W[jd])
 (;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qf]))
 (;B[rd]LB[mb:A][nb:B]C['a' reduces, 'b' dies.]
 (;W[mb]
 ;B[nb]
 ;W[na]
 ;B[oa]
 ;W[ma]
 ;B[ob])
 (;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rc]
 ;B[pb]
 ;W[pc]
 ;B[oc]LB[pa:A][ra:B]C['a' or 'b' don't live.]
 (;W[pa]
 ;B[na]
 ;W[qb]
 ;B[ra])
 (;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[oa]
 ;W[qd]
 ;B[rf]
 ;W[pe]
 ;B[pf]
 ;W[od]
 ;B[oe]
 ;W[pd]
 ;B[qf]
 ;W[of]
 ;B[ne]
 ;W[pg]
 ;B[og]
 ;W[nf]
 ;B[rg]C[White dies.])))))
 (;W[qc]
 ;B[rd]
 ;W[oc]
 ;B[pc]
 ;W[pb]LB[nb:B][rc:A]C['a' drives White to the top side, 'b' encloses a living White group.]
 (;B[rc]
 ;W[mc]
 ;B[qb])
 (;B[nb]
 ;W[ob]
 ;B[nc]
 ;W[od]
 ;B[oe]
 ;W[rc]
 ;B[qd]
 ;W[rb])))
 (;B[mc]
 ;W[qc]
 ;B[pc]
 ;W[re]LB[rd:A][rf:B]C['a' is correct. 'b' is a mistake.
+]
 (;B[rd]
 ;W[rf]
 ;B[rc])
 (;B[rf]
 ;W[rd]
 ;B[qf]
 ;W[pb]
 ;B[ob]
 ;W[qb]C[White alive.
 ])))))))
 (;B[lc]LB[qf:A][dp:B]C[White 'a' or tenuki.
+]
 (;W[qf]
 ;B[qd])
 (;W[]LB[pj:A][qj:B]TR[qf][qg][qh][qi][qk]C[Black 'a' is possible, any of the triangled points and 'b' are wrong.
+]
 (;B[pj])
 (;B[qj]C[Bad
+]
 ;W[oj]C[Punishment
+]
 ;B[ph]
 ;W[qc])))
 (;B[kc]LB[qf:A][dp:B]C[White 'a' or tenuki.
+]
 (;W[qf]
 ;B[qd])
 (;W[]LB[pj:A][qj:B]TR[qf][qg][qh][qi][qk]C[Black 'a' is possible, any triangled stone and 'b' are wrong.
+]
 (;B[pj])
 (;B[qj]C[Bad
+]
 ;W[oj]C[Punishment
+]
 ;B[ph]
 ;W[qc])))
 (;B[ic]
 ;B[qk]C[If Black has a low extension this far away or more, this way of play is possible.
 ]))
 (;W[qc]C[
 -3 = San-san
 ---------
 White 2 is not joseki, but illustrates possbilities without considering surrounding stones.
+]
 ;B[qd]
 ;W[pc]LB[nc:B][oc:A]C['a' is usual, 'b' closes off the top side or takes sente.]
 (;B[oc]
 ;W[ob]LB[nb:b][pb:c][nc:a]C[Black continues with 'a' or 'b'. Both end with Black gote.
 'c' is only possible with the ladder]
 (;B[nc]
 ;W[nb]
 ;B[mc]LB[rd:a][dp:b]C[White continues with 'a'.
 It is not advisable, but possible for White to play elsewhere and still live in the corner.]
 (;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]C[The sequence ends.]
 ;W[]C[White plays elsewhere.]
 ;B[mb]LB[pa:a][dp:b]C[White plays locally at 'a', but can survive after playing elsewhere ('b').]
 (;W[pa]
 ;B[na]
 ;W[ra])
 (;W[]LB[na:a][pa:b]C[White plays elsewhere.
 Black may try 'a' or 'b'.]
 (;B[na]LB[pa:B][pb:A]C['a' or 'b' are ok.]
 (;W[pb])
 (;W[pa]
 ;B[ra]LB[qa:b][rb:a]C[White continues with 'a' or 'b'.]
 (;W[rb]LB[qa:a][qb:b]C['a' and 'b' are miai.]
 ;B[ma]
 ;W[qa]
 ;B[pb]
 ;W[sa]
 ;B[oa])
 (;W[qa]
 ;B[rb]
 ;W[sb])))
 (;B[pa]
 ;W[pb]
 ;B[ra]
 ;W[qa]
 ;B[qb]
 ;W[rb]
 ;B[qa]
 ;W[oa]
 ;B[sd]
 ;W[sc])))
 (;W[]LB[rc:B][rd:A]C[White plays elsewhere. White can still live in the corner in gote.
 Black can attack on 'a' or 'b'.]
 (;B[rd]
 ;W[mb]
 ;B[lc]LB[rb:B][rc:A]C[White lives on 'a'. If he doesn't, Black kills on 'b'.]
 (;W[rc])
 (;B[rb]
 ;W[qb]LB[pa:A][qa:B]C['a' kills, 'b' is only ko.]
 (;B[pa]
 ;W[lb]
 ;B[kb]
 ;W[qa]
 ;B[la]
 ;W[rc]
 ;B[sc]
 ;W[sb]
 ;B[sa])
 (;B[qa]LB[pa:B][ra:A]C['a' is correct making ko. 'b' simply dies.]
 (;W[ra]
 ;B[sa]
 ;W[pa]
 ;B[rc])
 (;W[pa]
 ;B[ra]))))
 (;B[rc]
 ;W[rb]
 ;B[rd]LB[mb:A][sb:B]C[White lives on 'a' or 'b'.]
 (;W[mb]
 ;B[lc])
 (;W[sb]C[White 14 is necessary.]))))
 (;B[nb]LB[nc:a][od:c][rd:b]C[White continues with 'a' to 'c'.]
 (;W[nc]
 ;B[od]
 ;W[mb]LB[pb:b][nd:a]C[Black continues with 'a', possibly 'b'. Black 'a' gives thickness, Black 'b' the corner.]
 (;B[nd]C[Black 11 plays for thickness.]
 ;W[na]
 ;B[mc]
 ;W[nb]
 ;B[lc])
 (;B[pb]C[Black 11 to take the two White corner stones.]
 ;W[na]
 ;B[qb]LB[rc:a]C[Unlikely to realize, but the White stones have some aji at 'a'.]))
 (;W[rd]
 ;B[re]
 ;W[qe]LB[od:a][pe:b]C[Black 'a' next keeps things simple for Black and gives him a good result. Black 'b' is sometimes possible, but Black needs to be careful.]
 (;B[od]
 ;W[rf]
 ;B[rc]
 ;W[se]
 ;B[rb])
 (;B[pe]LB[nc:b][rc:a]C[White can now defend at 'a'. Cutting at 'b' does not produce a good result for White.]
 (;W[rc]
 ;B[qf]
 ;W[pb]
 ;B[nd]C[Black gets a thick position and White a living L+2 group.])
 (;W[nc]C[White 12 is a mistake.]
 ;B[od]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[qb]C[Compared to the usual variation with Black taking the corner,
 White 8 and 10 don't serve any purpose.])))
 (;W[od]C[White 8 was played by Kato Masao against Cho Chikun in game 1 of the 21st Judan Title, March 3, 1983.]
 ;B[nc]
 ;W[rd]
 ;B[re]
 ;W[rb]
 ;B[sd]
 ;W[rc]LB[pb:b][qf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qf]
 ;W[pb]
 ;B[oe])
 (;B[pb]C[Black 15 is unreasonable.]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[rf]
 ;W[pf]
 ;B[oe]
 ;W[rg])))
 (;B[pb]LB[nb:B][qb:A]C['a' if Black has the ladder, else 'b'.]
 (;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[nc])
 (;W[nb]LB[qb:B][rc:A]C['a' if Black doesn't have the ladder, else Black may choose 'b'.]
 (;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[pa])
 (;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[re]
 ;W[od]
 ;B[nc]
 ;W[qe]
 ;B[pe]
 ;W[mc]
 ;B[nd]
 ;W[oe]
 ;B[pf]
 ;W[ne]))))
 (;B[nc]LB[nb:A][oc:B]C['a' is usual, 'b' is not recommended.]
 (;W[nb]LB[mb:A][mc:B]C[Black can either play 'a' to close off the top side or tenuki,
 if he has already secure territory on the right side, after which later White continues on 'b'.]
 (;B[mb]
 ;W[ob]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;W[mc]
 ;B[nd]
 ;W[lb]))
 (;W[oc]LB[nd:A][od:B]C[To close off the top side, Black must play 'a'. 'b' is not recommended.]
 (;B[nd]
 ;W[od]
 ;B[oe]
 ;W[pe]
 ;B[rd]
 ;W[ne]
 ;B[of]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[lc]
 ;W[rc]
 ;B[pf]C[White has unnecessarily strenghtened Black's influence.])
 (;B[od]
 ;W[nb]LB[mb:B][mc:A]C['a' is necessary, 'b' is nonsense.]
 (;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf])
 (;B[mb]
 ;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[ob]
 ;W[ma]
 ;B[qb]
 ;W[rc]
 ;B[pb]
 ;W[rb]
 ;B[ra]
 ;W[oa]
 ;B[qa]
 ;W[na]
 ;B[rd]
 ;W[pa])))))
 (;W[qi]C[White may try 2 when Black has already played at top as shown.]
 ;B[qk]
 ;W[qf]
 ;B[qe]
 ;W[pf]LB[nc:B][nd:A]TR[jc]C['a' is correct, 'b' is also possible without the triangles stone.
+]
 (;B[nd]
 ;W[qc]LB[pc:a][qd:c][re:b]TR[oi]C[Black continues with 'a', if White is already safe, e.g. with an additional stone on the triangled position, or 'b', to kill one side. Black 'c' is a special tactic.
+]
 (;B[pc]
 ;W[re]LB[qd:A][rd:B]TR[jc]C['a' is correct, 'b' is the wrong choice, when Black has a secure base, here guaranteed by the triangled stone.
+]
 (;B[qd]LB[rd:B][dp:A]C[White should play elsewhere and immediately at 'b' what is only yose.
+]
 (;W[]C[White plays elsewhere.]
 ;B[rg]C[The peep at 13 is not recommended.]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[ri]
 ;W[rc]C[White gets more in the corner.
+]
 ;B[rd]
 ;W[sd]
 ;B[sb]
 ;W[rb]
 ;B[ra]
 ;W[qa]
 ;B[pa]C[Ko
 ])
 (;W[rd]
 ;B[rc]LB[rb:B][rd:12][rg:A]C[Black punishes on 'a', if White  12 was too early. White's endgame is on 'b'.
+]
 (;B[rg]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[ri])
 (;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[ra]
 ;W[qc])))
 (;B[rd]
 ;W[qd]
 ;B[rc]
 ;W[pe]
 ;B[qb]))
 (;B[re]C[Black 9 shows an uncompromising attitude. Black accepts a reduction at top for an attack on the three White stones at right.
 * Joseki *
+]
 ;W[oc]
 ;B[od]LB[nb:B][nc:A][pc:C]C[White lives with 'a', 'b' or 'c'.]
 (;W[nc]
 ;B[pc]
 ;W[pb]
 ;B[mc]LB[mb:b][rb:a]C[White continues with 'a' to live in the corner, 'b' to live on
 the top.]
 (;W[rb]C[White 16 to live in the corner.]
 ;B[mb]
 ;W[oa]
 ;B[nf]
 ;W[oi]
 ;B[ok])
 (;W[mb]C[White 16 to live at top (and give Black the corner).]
 ;B[qb]
 ;W[ob]
 ;B[rc]LB[kc:A][lc:B]C['a' or 'b' are ok.]
 (;W[kc]
 ;B[jd]
 ;W[md]
 ;B[me]
 ;W[lc]
 ;B[ke]C[Black gets good outside strength with 25.]
 ;W[oi])
 (;W[lc]
 ;B[md])))
 (;W[nb]LB[nc:A][pc:B]C['a' is correct, 'b' is questionable.]
 (;B[nc]
 ;W[ob]
 ;B[mb]
 ;W[rc])
 (;B[pc]
 ;W[pb]
 ;B[nc]
 ;W[ob]
 ;B[rc]
 ;W[rb]
 ;B[qd]
 ;W[qb]
 ;B[sb]
 ;W[lc]))
 (;W[pc]
 ;B[nc]LB[nb:B][rb:A]C['a': White lives.
 'b': White dies.]
 (;W[rb])
 (;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[sb])))
 (;B[qd]
 ;W[pb]LB[nb:B][pc:A]C[White 10 is the right move when the time comes, after the White group on the right is secured.
 Black 'a' is usual, 'b' doesn't make sense without extra strength.]
 (;B[pc]
 ;W[rb]LB[ob:A][rc:B]C['a' is correct, 'b' doesn't kill.]
 (;B[ob]
 ;W[rd]
 ;B[re]
 ;W[qa])
 (;B[rc]
 ;W[qb]
 ;B[rd]
 ;W[nb]
 ;B[mb]
 ;W[nc]
 ;B[mc]
 ;W[sb]))
 (;B[nb]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[sd]
 ;W[rb]
 ;B[qa]
 ;W[ra]
 ;B[pa]
 ;W[ob]
 ;B[oa]
 ;W[nc]
 ;B[mc]
 ;W[oc]
 ;B[mb]
 ;W[od]
 ;B[oe]
 ;W[ne]
 ;B[md]
 ;W[pe]
 ;B[of]
 ;W[rf])))
 (;
 ;B[nc]LB[pb:B][qc:A]C['a' or 'b' are ok.
+]
 (;W[qc]LB[pc:A][re:B]C['a' is ok, 'b' is questionable.
+]
 (;B[pc]
 ;W[re]
 ;B[qd]LB[rd:B][dp:A]C[White should play elsewhere and not immediately play 'b'.
+]
 (;W[]
 ;B[rg]C[If Black comes here ...
+]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[ri]
 ;W[rc]C[... White gets more in the corner ...
+]
 ;B[rd]
 ;W[sd]
 ;B[sb]
 ;W[rb]
 ;B[ra]
 ;W[qa]
 ;B[pa]
 ;W[sa]C[... a ko.
 ])
 (;W[rd]
 ;B[rc]
 ;B[rg]C[Soon the punishment.
+]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[ri]))
 (;B[re]
 ;W[ob]
 ;B[nb]LB[oc:B][od:A]C['a' or 'b'.
+]
 (;W[od]
 ;B[oc]
 ;W[pc])
 (;W[oc]
 ;B[od]
 ;W[rc]
 ;B[nd]
 ;W[ra])))
 (;W[pb]LB[ob:B][pc:A]C['a' or 'b' are possible.
+]
 (;B[pc])
 (;B[ob]))))
 (;W[qd]LB[qc:a][qe:b]C[White 2 is exceptional, used only when 'a' and 'b' are miai.]
 (;B[qc]
 ;W[qe]LB[pc:b][rc:a]C[Black continues with 'a' or 'b'.]
 (;B[rc]LB[od:c][pe:b][qh:a]C[White continues with 'a'. White 'b' is recommended only if a Black play at 'c' is not disadvantageous (forcing Black along the fourth line is generally bad).]
 ;W[qh])
 (;B[pc]
 ;W[qh]
 ;B[pe]))
 (;B[qe]
 ;W[qc]LB[pc:a][re:b]C[Black continues with 'a' or 'b', depending upon the side of interest.]
 (;B[pc]
 ;W[re]LB[qf:a][rf:b]C[Black continues with 'a' for thickness, or 'b' for the corner.]
 (;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[nc])
 (;B[rf]
 ;W[qf]
 ;B[pe]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]))
 (;B[re]
 ;W[pc]
 ;B[od]LB[nc:b][oc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc]LB[nc:b][nd:a]C[White must crawl once more with 8.
 Black continues with 'a'. Black 'b' creates too many cutting points.]
 (;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[pj])
 (;B[nc]C[Black 9 leaves one too many cutting points.]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]))
 (;W[nc]C[White 8 is a mistake.]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc]
 ;W[rb]
 ;B[rd]
 ;W[qa]LB[oa:b][sb:a]C['a' and 'b' are miai.
 Black has superior thickness.]))))
 (;W[qh]C[
 -Space Approach = Sangen Kakari = Sekan Keolch'im = San Gua`jiao~
 -------------------------------------------------------------------
+]
 ;B[qf]LB[ob:B][nc:A]C[This is the only local continuation for Black. White can approach on 'a' or 'b'.]
 (;W[nc]
 ;B[pb])
 (;W[ob]LB[pb:B][pc:A]C['a' or 'b'.]
 (;B[pc]
 ;W[lc])
 (;B[pb]LB[pc:A][pe:B]C['a' is the usual continuation, 'b' is trick move.]
 (;W[pc]LB[oc:B][qc:A]C[Black keeps the corner on 'a' or goes outside on 'b'.]
 (;B[qc]
 ;W[oc]
 ;B[qb]
 ;W[od]
 ;B[pe])
 (;B[oc]
 ;W[qc]
 ;B[od]
 ;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[mc]))
 (;W[pe]LB[oc:A][oe:B][qe:C]C[Black plays on 'a' or 'b' or falls into White's trap on 'c'.]
 (;B[oc]
 ;W[qe]
 ;B[oe]
 ;W[pf]
 ;B[qd])
 (;B[oe]LB[pc:A][qd:B]C['a' emphasizes the top, 'b' the right.]
 (;W[pc]
 ;B[qc]
 ;W[oc]
 ;B[qb]LB[od:A][qd:B]C['a' is correct, 'b' is an overplay.]
 (;W[od]
 ;B[qd]
 ;W[ne]
 ;B[of]
 ;W[nf]
 ;B[og])
 (;W[qd]
 ;B[od]
 ;W[qe]
 ;B[pf]
 ;W[rf]LB[se:A][rg:B]C[Black captures on 'a' or 'b'.]
 (;B[se]
 ;W[rc]
 ;B[sd]LB[sc:D][rd:C][sd:19][re:A][se:17][sf:B]C[Black 17 and 19 are a tesuji called "patting the racoon's belly."
 White 'a', 'b', 'c' or 'd' don't help.]
 (;W[re]
 ;B[rg])
 (;W[sf]
 ;B[rg])
 (;W[rd]
 ;B[rb])
 (;W[sc]
 ;B[rb]))
 (;B[rg]
 ;W[rc]
 ;B[rb]
 ;W[of]
 ;B[nf]
 ;W[qg]
 ;B[og]
 ;W[rd]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lb])))
 (;W[qd]
 ;B[qc]
 ;W[od]
 ;B[pc]
 ;W[of]
 ;B[ne]
 ;W[qe]
 ;B[pf]
 ;W[rf]
 ;B[og]))
 (;B[qe]
 ;W[pc]LB[oc:B][qc:A]C['a' or 'b'.]
 (;B[qc]
 ;W[oc]LB[qb:A][od:B]C['a' or 'b'.]
 (;B[qb]
 ;W[od]
 ;B[qd]LB[pe:6][qe:7]C[Now Black 7 is positioned inefficient. White is better than in the same sequence without playing 6 beforehand.]
 ;W[og])
 (;B[od]
 ;W[qb]
 ;B[rb]
 ;W[pa]LB[rc:A][nd:B]C[As 'a' and 'b' are miai, White gets one follow-up move in sente and is better.]))
 (;B[oc]
 ;W[qc]
 ;B[od]
 ;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[mc]))))))
 (;W[qj]
 ;B[ql]
 ;W[qf]C[These variations are included as Hoshi-Tenuki-Nirensei variations.])
 (;W[rd]C[This move is covered as Hoshi-Tenuki-variation with additional Black stones.])
 (;W[re]C[This move is covered as Hoshi-Tenuki-variation with additional Black stones.])
 (;W[rb]C[Trick move.]
 ;B[qc]
 ;W[rc]
 ;B[rd]
 ;W[qb]
 (;B[pb]
 ;W[re]
 ;B[sd]
 ;W[ob]
 ;B[pa]
 ;W[oc]
 ;B[pc]
 ;W[qe]
 ;B[qd]C[Bad result for Black. Black is not yet alive in the corner, even after killing 3 stones.])
 (;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]C[Good punishment. Black is clearly ahead.])))
 (;B[oc]LB[qc:c][qd:a][oe:e][pe:b][qe:d][dp:f]C[
 -3 Point = Mokuhazushi = Waemok = Wai`mu`
 ---------------------------------------------------
 The mokuhazushi (5-3) point was popular in the Edo period in Japan (1600 - 1867). It emphasizes influence. Territorially, it is inferior to the 3-4 point.
 Approach moves for White range from 'a', 'b' or 'c'. White 'a' is typical.
 After 'a', the 5-3 point can lead to different complicated joseki: the taisha and the near low pincer. Both can be avoided or simplified.
 White 'b' forfeits the corner, and emphasizes the right side, so locally this is disadvantageous for White.
 White 'c' leads to a division of profit for White and influence for Black. A ladder helps when playing White 'c'.
 White 'd' is played by amateurs who don't know 3,5-point-joseki and professionals in situations where an equal result in this corner is unimportant. 'd' is inferior to 'a', 'b' and 'c'.
 White 'e' can be played as part of center-moyo-strategy, but is not joseki, but more like playing a reduction after tenuki once.
 After White plays tenuki 'f', Black can choose between two shimari and a trick play.
+]
 (;W[qd]LB[ic:d][jc:c][kc:b][lc:k][pe:a][pf:i][qf:e][pg:h][qg:f][ph:j][qh:g]TR[cd]C[
 Komoku Kakari
 -----------------
 White 2 is the standard approach because of its solidity and
 stability.
 Black replies with 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'
 Black 'd' is strategically correct, if there is a Black stone
 on the triangled, a White stone on the squared point.
 The most difficult of all joseki is the taisha 'i'. Once Black has played this move, he has only one inferior move to simplify. So, if he doesn't know the '1000 variations', he may well choose one of the five pincers, who are much easier. But if he knows them and White does not, White need not fear Black 'i', because he still has several opportunities to avoid the complex variations with an equal or well acceptable result.
 'e' is the most complicated of the five pincers, you may well learn it at least. White can simplify.
 'k' is a mistake.
 j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
 outcomes:
 a1, b2, c3, d4 - Black top, White right
 e5 - Black right, White top, with some White choice
 f6, g7 - Black top & right, White corner & out
 h8 - Black top, White corner & out
 i9 - taisha (Black ladder); Black top, White right generally
 ]MA[ec]
 (;B[pe]LB[pd:b][qe:a][qf:d][dp:c]C[
 Kake (pressing down)
 -----------------------
 A direct attempt to make the most of Black's superior influence.
 Joseki continues with White 'a'.
 White 'b' may be reasonable given support at top.
 White suffers a terrible loss locally to play elsewhere ('c').
 White 'd' is a mistake.
+]
 (;W[qe]LB[pf:a][pg:b]C[Black continues with 'a' or 'b'.]
 (;B[pf]LB[qf:b][qg:a]C[White continues with 'a', possibly 'b'.]
 (;W[qg]LB[ic:e][jc:a][qc:d][qf:b][pg:c]C[Black continues with 'a', 'b', 'c', 'd' or 'e'.
 e5, d4, c3, b2, a1]
 (;B[jc]C[
 * Joseki *]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[nh]
 ;B[mg]
 ;W[qf]LB[od:a]C['a' is a key point for both players.]
 ;B[je]C[A post-joseki extension.]
 ;W[od]
 ;B[pd]
 ;W[pc]
 ;B[pb]
 ;W[qc]
 ;B[nd]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[qb]
 ;B[na]
 ;W[pa]LB[lc:a][dp:b]C[Black continues with 'a'. Black cannot afford to play elsewhere ('b').]
 (;B[lc])
 (;B[]LB[mc:b][ne:a]C[Black plays elsewhere, a mistake.
 White continues with 'a' or 'b'. Both lead to the same result.]
 (;W[ne]
 ;B[oe]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[lb]
 ;W[ld]LB[kb:b][me:a]C['a' and 'b' are miai.])
 (;W[mc]
 ;B[md]
 ;W[ne]
 ;B[oe]
 ;W[lc]
 ;B[lb]
 ;W[ld]LB[kb:b][me:a]C['a' and 'b' are miai.])))
 (;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rh]
 ;B[pg]
 ;W[qh]
 ;B[re]
 ;W[sg]
 ;B[qc]
 ;W[rd]
 ;B[jc]C[
 * Joseki *]
 ;W[pd]C[Later.]
 ;B[od]
 ;W[ne])
 (;B[pg]
 ;W[qh]
 ;B[ph]
 ;W[pi]LB[qf:b][oi:a][qi:c]C[Black continues with 'a' or 'b'.
 'c' brings the same variations as 'b'.
+]
 (;B[oi]
 ;W[oj]
 ;B[qf]
 ;W[rf]
 ;B[re]
 ;W[rg]
 ;B[qc]
 ;W[rd]
 ;B[pj]
 ;W[qi]
 ;B[ni])
 (;B[qf]
 ;W[rf]
 ;B[qi]LB[pc:b][oi:a][qj:c]C[White continues with 'a', 'b' or 'c'.]
 (;W[oi]
 ;B[ri]
 ;W[rh]
 ;B[sh]
 ;W[rg]
 ;B[qk]
 ;W[qc]
 ;B[ne]C[
 * Joseki *])
 (;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[pd]
 ;W[qc]
 ;B[ri]LB[rg:a][rh:b]C[White continues with 'a' or 'b'.]
 (;W[rg]
 ;B[pj]
 ;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[nd]C[
 * Joseki *])
 (;W[rh]
 ;B[si]
 ;W[rg]
 ;B[pj]
 ;W[oi]
 ;B[oj]
 ;W[ni]
 ;B[nd]))
 (;W[qj]
 ;B[ri]
 ;W[rh]
 ;B[sh]
 ;W[rg]
 ;B[rj]
 ;W[qk]
 ;B[rk]
 ;W[ql]
 ;B[rl]
 ;W[qm]
 ;B[rm]
 ;W[qn]LB[rc:b][rn:a]C[Black continues with 'a' and 'b'.]
 (;B[rn]LB[pc:a][qo:b]C[White continues with 'a'. White 'b' is a fatal mistake.]
 (;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[pd]
 ;W[qc]
 ;B[oi]
 ;W[pj]
 ;B[qo]
 ;W[po]
 ;B[pp]
 ;W[qp]
 ;B[ro]
 ;W[op]
 ;B[pq]
 ;W[oq]
 ;B[oo]
 ;W[pn]
 ;B[pr]
 ;W[no])
 (;W[qo]C[White 28 is a mistake.]
 ;B[oi]
 ;W[pj]
 ;B[qb]LB[rb:b][ro:a]C[White 'a' is the obvious response, but does not work. Neither does the more promising looking 'b'.]
 (;W[ro]
 ;B[rc]C[Black wins the capture race.])
 (;W[rb]
 ;B[qc]
 ;W[rc]
 ;B[ra]
 ;W[se]
 ;B[rd]LB[sb:a][sd:b]C[Neither 'a' nor 'b' work for White.]
 (;W[sb]
 ;B[sd]
 ;W[sg]
 ;B[pd])
 (;W[sd]
 ;B[sb]
 ;W[re]
 ;B[sg]
 ;W[ro]
 ;B[so]
 ;W[sn]
 ;B[sp]
 ;W[rp]
 ;B[sm]
 ;W[sq]
 ;B[si]
 ;W[sk]
 ;B[pd]
 ;W[sn]
 ;B[so]
 ;W[sp]
 ;B[qa]
 ;W[sn]
 ;B[sa]))))
 (;B[rc]LB[qc:a][rn:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qc]C[The following sequence, from White 28 to Black 37, is a one-way street.]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[pc]
 ;B[ob]
 ;W[pa]
 ;B[rd]
 ;W[re]
 ;B[qa]LB[mb:d][sb:a][od:b][sd:c][qi:13]TR[pp]C[White continues with 'a'. White 'b', leads to a ko White can
 win. White 'c' is a mistake. If White has an additional stone on the triangled position, Black 13 was wrong and is punished on 'd'.
+]
 (;W[od]LB[nd:b][pd:a]C[Black may try the obvious 'a', or 'b'.]
 (;B[pd]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[mc]
 ;W[na]
 ;B[nd]
 ;W[oa]
 ;B[oe]
 ;W[lb]LB[sd:a][rn:b]C[Now, the captures at 'a' and 'b' are miai.])
 (;B[nd]
 ;W[mb]C[White threatens escape as in the other variation.]
 ;B[oa]
 ;W[pd]
 ;B[mc]
 ;W[oe]C[White cannot be caught.]))
 (;W[sb]
 ;B[sa]
 ;W[ra]
 ;B[pd]
 ;W[sd]
 ;B[sa]
 ;W[oa]C[White hates to make this play, reinforcing Black, but has no choice, lacking other other ko threats.]
 ;B[mb]
 ;W[ra]
 ;B[oi]
 ;W[pj]
 ;B[sa]
 ;W[nb]
 ;B[nc]
 ;W[ra]
 ;B[rn]
 ;W[sc]
 ;B[qo]
 ;W[po]
 ;B[pp]
 ;W[qp]
 ;B[ro]
 ;W[op]
 ;B[pq]
 ;W[oq]
 ;B[oo]
 ;W[pn]
 ;B[pr]
 ;W[no])
 (;W[sd]C[White 38 is a mistake. White loses.]
 ;B[sc]
 ;W[sa]
 ;B[se]
 ;W[sf]
 ;B[oa]
 ;W[sd]
 ;B[pd])
 (;AW[pp]
 ;W[mb]
 ;B[rn]
 ;W[ro]
 ;B[sn]
 ;W[si]))
 (;W[rn]C[White 28 is a mistake.]
 ;B[rd]
 ;W[re]
 ;B[qc]C[White cannot evade capture.]))))
 (;B[qi]LB[pc:B][oi:A][qj:C]C[White continues with 'a', 'b' or 'c'.
+]
 (;W[oi]
 ;B[qf]
 ;W[rf]LB[qf:13][rf:14][oi:12][qi:11]C[Same variation as Black 13, White 14 played before Black 11, White 12, see there for continuation.
 ])
 (;W[pc]
 ;B[qf]
 ;W[rf]LB[pc:12][qf:13][rf:14][qi:11]C[Same variation as Black 13, White 14 played before Black 11, White 12, see there for continuation.
 ])
 (;W[qj]
 ;B[ri]
 ;W[rh]
 ;B[qf]
 ;W[rf]LB[qf:15][rf:16][qi:11][qj:12]C[Same variation as Black 15, White 16 played before Black 11, White 12, see there for continuation.
 ])))
 (;B[qc]
 ;W[pg]
 ;B[pd]
 ;W[ng]
 ;B[qf]
 ;W[rf]
 ;B[rc]C[White may play elsewhere, sacrificing the two stones.])
 (;B[ic]LB[qc:A][pg:B]C[Black can make an extra wide extension. In this situation, White simply plays 'a' and is reluctant to push at 'b', as in variation 1, as Black builds even better thickness towards the wide extension.]
 (;W[qc]CR[mc]C[White 8 aims at an invasion at the marked location, where link-up or escape are possibilities.])
 (;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[pi]
 ;B[nh]
 ;W[ni]
 ;B[mi]
 ;W[nj]
 ;B[mj]
 ;W[nk]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[re])))
 (;W[qf]LB[jc:b][pg:a]C[White 6 is a special strategy, intending to make a splitting play between Black strength at the top left and right. Black continues with 'a', or, anticipating White playing at 'b', Black plays there first. In other words, 'a' and 'b' are miai.]
 (;B[pg]LB[jc:A][qh:B]C['a' or 'b'.]
 (;W[jc]C[White 8 makes sense as a splitting attack if Black has strength in the upper left as well as the upper right as shown.]
 ;B[qg]
 ;W[qb]C[White 10 allows White to live in the corner.])
 (;W[qh]
 ;B[jd]))
 (;B[jc]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ph]
 ;W[qg]
 ;B[ng]
 ;W[oi])))
 (;B[pg]LB[pd:c][pf:a][qf:b]C[Black plays 5 for rapid devlopment.
 White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[pf]LB[of:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[of]
 ;W[qf]LB[ng:b][og:a][qg:c][qh:d]C[Black continues with 'a', 'b' to 'd'.]
 (;B[og]LB[pc:a][qh:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pc]LB[ob:a][nd:b]C[Black continues with 'a'. Black 'b' is too mild.]
 (;B[ob]C[Black 11 threatens encroachment into the corner.]
 ;W[qh]
 ;B[jc]LB[pi:a]C[
 * Joseki *
 'a' is now a good point for both players.])
 (;B[nd]C[Black 11 is not recommended. White can easily make life in the
 corner.]
 ;W[ic]CR[qg]C[Being secure in the corner, White plays the extension at top first, spoiling Black's thickness.
 The marked location is gote for Black.]))
 (;W[qh]C[White 10 is premature.]
 ;B[qc]
 ;W[rc]
 ;B[qg]
 ;W[rg]
 ;B[pd]
 ;W[qb]
 ;B[pc]
 ;W[re]
 ;B[jd]))
 (;B[ng]
 ;W[oh]
 ;B[og]
 ;W[pc]
 ;B[ob]
 ;W[qh]
 ;B[jc]C[
 * Joseki *]
 ;W[]C[White plays elsewhere.]
 ;B[ph]C[Black continues with 16 to build further thickness.]
 ;W[qi]
 ;B[oj])
 (;B[qg]
 ;W[og]
 ;B[oe]
 ;W[pc]
 ;B[ob]
 ;W[oh]
 ;B[rg]
 ;W[pb]
 ;B[qj])
 (;B[qh]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[nh]
 ;W[mg]
 ;B[ne]))
 (;B[qf]C[Black 7 is a mistake.]
 ;W[of]
 ;B[qg]
 ;W[pd]
 ;B[oe]
 ;W[od]
 ;B[ne]
 ;W[nd]))
 (;W[qf]C[White 6 is a mistake.]
 ;B[pf]
 ;W[qh])
 (;W[pd]C[White 6 is vulgar.]
 ;B[od]
 ;W[pf]
 ;B[of]
 ;W[oe]
 ;B[ne]LB[pe:b][og:a]C[Neither White 'a' nor 'b' are good.]
 (;W[og]
 ;B[pe]
 ;W[qf]
 ;B[oe])
 (;W[pe]C[White has terrible shape.]
 ;B[ng]))))
 (;W[pd]C[White 4 only makes sense with surrounding support.]
 ;B[od]
 ;W[oe]LB[qe:B][pf:A]C['a' is the joseki, but unknown to amateurs, who often play 'b'.
 Both moves end with White having a small corner territory and a cutting stone, while Black has both sides, but not totally secured.
+]
 (;B[pf]
 ;W[ne]LB[qb:a][re:b]C[Black continues with 'a' or 'b'. Black 'b' if White does not have a pincer at top (giving Black room to make life).]
 (;B[qb]LB[rb:B][rf:A]C['a' is correct. 'b' is a mistake.
+]
 (;W[rf]LB[rc:B][qg:A]C['a' is ok, 'b' is possible.
+]
 (;B[qg]
 ;W[rb]
 ;B[pb]
 ;W[rc]LB[lc:B][rg:A]C[Black continues with 'a' or 'b'.
+]
 (;B[rg]
 ;W[re]
 ;B[lc]
 ;W[ng]
 ;B[pk])
 (;B[lc]LB[ng:A][rg:B]C['a' is ok, 'b' is questionable.
+]
 (;W[ng]
 ;B[rg]
 ;W[re]
 ;B[pj])
 (;W[rg]
 ;B[qi]
 ;W[qh]
 ;B[ph]
 ;W[rh]
 ;B[le]
 ;W[ng]
 ;B[oj])))
 (;B[rc]C[If you know the follow-up, please email: kogo@waterfire.us.
+]
 ;W[qg]
 ;B[re]
 ;W[qe]
 ;B[qf]
 ;W[rd]
 ;B[rg]
 ;W[se]
 ;B[pg]
 ;W[qh]
 ;B[rh]
 ;W[ph]
 ;B[og]
 ;W[ri]
 ;B[lc]
 ;W[le]))
 (;W[rb]
 ;B[qc]
 ;W[rc]
 ;B[qe]C[W dead.
 ]))
 (;B[re]
 ;W[rd]
 ;B[og]
 ;W[qe]C[If White tries pushing through.]
 ;B[rf]
 ;W[qf]
 ;B[qg]))
 (;B[qe]
 ;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qg]
 ;W[pb]
 ;B[ob]
 ;W[rb]))
 (;W[]C[White plays elsewhere. This is conceivable only when Black 3 is a ko threat.]
 ;B[qe]
 ;W[qi]LB[qg:a][cq:b]C[Black must play 'a' to capture White 2. White can live in the corner if Black plays elsewhere ('b').]
 (;B[qg])
 (;B[]C[Black plays elsewhere. White can live in the corner.]
 ;W[pd]
 ;B[od]
 ;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qg]C[Black must defend.]
 ;W[pb]C[Allowing White life in the corner.]
 ;B[ob]
 ;W[rb]))
 (;W[qf]C[White 4 is a mistake, perhaps from confusion with the 3-4 variation in the Shusaku joseki of Black pressing after White tenuki.]
 ;B[qe]
 ;W[re]LB[pd:a][rf:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[rd]
 ;B[og]
 ;W[qg]
 ;B[jd]C[Black gets good position with a shape having no defects. White is too low.])
 (;B[rf]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[pd]C[Black gets corner profit.])))
 (;B[kc]LB[mc:c][pe:a][pf:b][dp:d]C[
 -Space Extension = Sangen Biraki = Sekan Peollim = Chai San
 -------------------------------------------------------------
 Three spaces is the minimum extension. Two spaces is too mild, as White attaches against the 5-3 stone.
 White can play at 'a' through 'c', or play elsewhere.
+]
 (;W[pe]
 ;B[]C[Black plays elsewhere.]
 ;W[mc]LB[mb:a][oe:b]C[Black continues with 'a' or 'b'.]
 (;B[mb]
 ;W[lb]
 ;B[lc]
 ;W[nb]
 ;B[md]
 ;W[nc]
 ;B[nd]
 ;W[od]
 ;B[ob]
 ;W[ma]
 ;B[oa]
 ;W[na]
 ;B[kb]
 ;W[pc]
 ;B[oe]
 ;W[pd]
 ;B[of])
 (;B[oe]
 ;W[of]
 ;B[ne]LB[pc:A][ld:B]
 (;W[pc]
 ;B[ob]
 ;W[pg]
 ;B[ld]C[
 * Joseki *])
 (;W[ld]C[Trying to escape with White 9 is a costly overplay.]
 ;B[pf]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[re]LB[rd:a][rg:b]C['a' and 'b' are miai.]
 (;W[rd]
 ;B[rg]C[White loses.])
 (;W[rg]
 ;B[rd]))))
 (;W[pf]C[Black may play elsewhere after this.]
 ;B[qc]
 ;W[rc]
 ;B[pd]LB[qb:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[]C[Black plays elsewhere.]
 ;W[qb]LB[pb:a][pc:b]C[Black continues with 'a'. Black 'b' is too submissive.]
 ;B[pb])
 (;W[qb]
 ;B[qe]
 ;W[pc]LB[rd:a][pe:b]C[Black continues with 'a'. Black 'b' is timid.]
 (;B[rd]LB[qc:A][od:B]C['a' or 'b'.]
 (;W[qc]
 ;B[pe]
 ;W[ob]
 ;B[nc])
 (;W[od]
 ;B[qc]
 ;W[pb]LB[nc:b][oe:a]C[Black continues with 'a', or the fierce fighting move of 'b'.
 Black must have the ladder to play 'b'.]
 (;B[oe]
 ;W[nd]
 ;B[pe]
 ;W[mc])
 (;B[nc]C[Black must have the ladder to play 15.]
 ;W[qd]
 ;B[pe]
 ;W[oe]
 ;B[qf]
 ;W[md]
 ;B[mc]
 ;W[qg]
 ;B[rg]
 ;W[pg]
 ;B[rh]
 ;W[re]
 ;B[rf]
 ;W[sd]LB[of:a][qj:b]C[Black plays 'a' with a favorable ladder. Without the ladder, Black must play 'b', and let White make good shape.]
 (;B[of]C[Black 29 starts a squeeze play. Black must have the ladder to play this way.]
 ;W[oh]C[White 30 is correct shape.]
 ;B[me]C[Black 31 is a tesuji to squeeze White into bad shape.]
 ;W[nf]
 ;B[ne]
 ;W[og]
 ;B[nd]
 ;W[of]
 ;B[pi])
 (;B[qj]C[Black 29 is necessary if Black does not have a favorable ladder, leaving White the opportunity to make good shape toward the center.]
 ;W[ld]
 ;B[lc]
 ;W[ng]))))
 (;B[pe]C[Black 11 is not recommended. Black gives up too much.]
 ;W[ob]
 ;B[nc]
 ;W[re]
 ;B[qf]
 ;W[pi])))
 (;W[mc]LB[mb:c][oe:a][pe:b]C[Black continues with 'a' or 'b'. Black 'c' is submissive.]
 (;B[oe]LB[pf:A][qg:B]C['a' is correct. 'b' is a mistake.]
 (;W[pf]LB[qc:B][ld:A]C['a' or 'b'.]
 (;B[ld]
 ;W[pc]
 ;B[ob]LB[qj:a][dp:b]C[
 * Joseki *
 White continues with an extension near 'a'. White cannot afford to play elsewhere ('b').]
 (;W[qj]LB[ne:b][of:a]C[Depending on the position, White may extend one space further than 10, as White 'a' forces Black 'b'.])
 (;W[]LB[of:b][ph:a]C[White plays elsewhere, a mistake.
 Black continues locally with 'a'. Black 'b' is a mistake.]
 (;B[ph]
 ;W[of]
 ;B[ne]
 ;W[pb]C[White must play 13 to secure a base in the corner.])
 (;B[of]C[Black 10 is a mistake, allowing White to solidify on the right.]
 ;W[pg])))
 (;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[pd]
 ;B[od]
 ;W[qi]
 ;B[ld]))
 (;W[qg]
 ;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[pd]
 ;B[od]C[White must make a slow move to secure his group. If he plays
 elsewhere, he will suffer a lot.]
 ;W[dp]
 ;B[re]
 ;W[rd]
 ;B[qf]
 ;W[pf]
 ;B[rg]
 ;W[qh]
 ;B[rh]LB[pe:A][qi:B]C['a' puts White on the run. With 'b', White dies.]
 (;W[pe]
 ;B[qi])
 (;W[qi]
 ;B[pe]
 ;W[qe]
 ;B[rf]
 ;W[ri]
 ;B[rb])))
 (;B[pe]LB[pd:b][qe:a]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pf]
 ;W[qg]
 ;B[ld]LB[pc:A][md:B]C[
 'a' is correct. 'b' is a mistake.]
 (;W[pc]
 ;B[pd]
 ;W[qc]
 ;B[ob]
 ;W[pg]
 ;B[ne]C[
 * Joseki *])
 (;W[md]C[White 10 is not recommended.]
 ;B[me]
 ;W[ne]
 ;B[nf]
 ;W[nd]
 ;B[pg]
 ;W[pd]
 ;B[qf]C[The result favors Black.
 Though Black has cutting points, the threat of a Black play at the marked location keeps White from losing liberties by squeezing Black using the group of White stones on the left (without first connecting).]MA[od]))
 (;W[pd]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[md]
 ;W[pf]C[
 * Joseki *]
 ;B[]C[Black plays elsewhere.]
 ;W[ic]LB[jc:a][dp:b]C[If White makes an approach here, Black must respond at 'a'. Black cannot afford to play elsewhere ('b').]
 (;B[jc]
 ;W[id])
 (;B[]C[Black plays elsewhere, a mistake.]
 ;W[lc]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[ke]LB[kb:b][lf:a]C[Black continues with 'a' if Black has a favorable ladder to the lower left. Black 'b' is a mistake.]
 (;B[lf]
 ;W[kb]
 ;B[je]C[If Black does not have the ladder, Black is in trouble.])
 (;B[kb]C[Black 19 is a mistake. Black gets squeezed, give White massive thickness.]
 ;W[lf]
 ;B[me]
 ;W[mf]
 ;B[je]
 ;W[kf]
 ;B[mb]
 ;W[nf]
 ;B[nd]
 ;W[jd]))))
 (;B[mb]LB[lb:b][pe:a]C[Black 5 is not recommended.
 White can consider 4 as a forcing play and continue at 'a', play elsewhere, or, with a favorable ladder, play 'b'.]
 (;W[pe]
 ;B[md]
 ;W[pc]
 ;B[ob])
 (;W[lb]C[White must have the ladder to play this way.]
 ;B[lc]
 ;W[nb]
 ;B[md]
 ;W[nc]
 ;B[nd]
 ;W[od]
 ;B[pd]
 ;W[oe]LB[pc:b][pe:a]C[Black continues with 'a' if the ladder is favorable, or 'b' if not.]
 (;B[pe]LB[pc:a][pf:b]C[White plays 'a' with a favorable ladder. Without a favorable ladder, White must play 'b', with a result favoring Black.]
 (;W[pc]
 ;B[ob]
 ;W[ma]
 ;B[of])
 (;W[pf]C[White plays 16 if the ladder to the lower left is unfavorable.]
 ;B[pc]
 ;W[qe]
 ;B[ob]
 ;W[ma]
 ;B[oa]
 ;W[na]
 ;B[qf]
 ;W[of]
 ;B[qc]
 ;W[kb]
 ;B[jc]
 ;W[qg]
 ;B[jb]
 ;W[ka]
 ;B[rf]))
 (;B[pc]C[Black plays 15 when the ladder is not favorable.]
 ;W[pe]
 ;B[ob]
 ;W[ma]
 ;B[oa]
 ;W[na]
 ;B[qc]
 ;W[kb]
 ;B[jc]
 ;W[rd]
 ;B[rc]
 ;W[jb]
 ;B[ic]C[The result favors White.
 Further, White can get a seki in the corner.]))))
 (;W[]LB[qf:a][qg:b]C[White plays elsewhere.
 Black pincers with 'a' or 'b'.]
 (;B[qf]
 ;W[pe]
 ;B[pf]
 ;W[ne]
 ;B[of]
 ;W[oe]
 ;B[md])
 (;B[qg]
 ;W[pe]
 ;B[qj]LB[pc:b][of:a]C[White continues with 'a', possibly 'b'. White 'a' is preferred as White is out more in the center, and, as seen in variation 'a', likely has a chance to defend the corner with 'b' after playing 'a'.]
 (;W[of]C[White 7 aims at invading.]
 ;B[md]C[Black defends...]
 ;W[pc]C[...so White protects the corner.])
 (;W[pc]C[White defends the corner.]))))
 (;B[jc]LB[ld:e][md:d][pe:a][pf:b][qg:c][dp:f]C[
 -Space Extension = Yongen Biraki = Nekan Peollim = Chai Si`
 -------------------------------------------------------------
 The choice between the three and four-space extension is mainly influenced by the position in the top-left corner. White has no particularly severe attack against the wider extension.
 White can answer at 'a', 'b' through 'd', 'e' or play elsewhere (f).
+]
 (;W[pe]LB[md:a][nd:b][dp:c]C[White continues with 'a' or 'b', or plays elsewhere.]
 (;B[md]C[
 * Joseki *]
 ;W[pc]
 ;B[od]
 ;W[pg]LB[qb:A]C[If White omits this move, Black can play on 'a'.])
 (;B[nd])
 (;B[]LB[lc:b][nd:a]C[Black plays elsewhere. White attacks with 'a' or 'b'.]
 (;W[nd]
 ;B[nc]
 ;W[ld]
 ;B[mc]
 ;W[ne]
 ;B[lc]
 ;W[qj])
 (;W[lc]C[White 6 is a sacrifice to fix up his shape in the corner.]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[le])))
 (;W[pf]LB[qc:a][md:b]C[Black continues with 'a'. Black 'b' is too mild.]
 (;B[qc]
 ;W[rc]
 ;B[pd]LB[qb:b][qe:a]C[White continues with 'a', possibly 'b'.]
 (;W[qe]
 ;B[qb]
 ;W[qj]C[
 * Joseki *])
 (;W[qb]
 ;B[qe]
 ;W[pc]
 ;B[rd]
 ;W[qc]
 ;B[pe]
 ;W[od]
 ;B[oe]
 ;W[nd]
 ;B[nc]C[Black's prospects in the ensuing fight are good.]))
 (;B[md]C[Black 5 is too defensive.]
 ;W[pc]
 ;B[od]
 ;W[qi]))
 (;W[qg]C[White 4 provides stability. It is played when White cannot expect to develop down the right side from the high diagonal or knight move. With this move the right side is played out. Black is in no hurry to respond.]
 ;B[pf]
 ;W[qf]
 ;B[qc]
 ;W[rc]
 ;B[pd]
 ;W[qe]
 ;B[qb])
 (;W[md]
 ;B[oe]
 ;W[pf]LB[kd:a][ph:b]C[Black continues with 'a' or 'b'.]
 (;B[kd]
 ;W[mf]
 ;B[mc]
 ;W[nd]
 ;B[nc]
 ;W[od]
 ;B[pc]
 ;W[qc]
 ;B[pd]
 ;W[pe])
 (;B[ph]LB[of:a][pg:b]C[White continues with 'a' or 'b'.
 'b' is an invention of Go Seigen against Takagawa Kaku in a game in 1956.
+]
 (;W[of]
 ;B[ne]
 ;W[pc]
 ;B[ob]
 ;W[ng]
 ;B[me]C[
 * Joseki *]
 ;W[pk])
 (;W[pg]LB[oh:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[oh]
 ;W[nf]LB[mb:B][qc:A][of:C]C[Black continues with 'a' or 'b'.
 'c' is a mistake.
+]
 (;B[qc]
 ;W[rc]
 ;B[ne]LB[me:B][ng:A]C['a' is correct. 'b' is a mistake.]
 (;W[ng]
 ;B[me]
 ;W[pc]
 ;B[ob]LB[kd:B][pk:A]C[
 * Joseki *
 'a' is a possible continuation, 'b' is possible to take sente.
+]
 (;W[pk]C[Possible continuation.
+]
 ;B[mi])
 (;W[kd]
 ;B[jd]LB[ke:B][lf:A]C['a' or 'b' are possible.
+]
 (;W[lf]
 ;B[kc]
 ;W[pk]
 ;B[mi])
 (;W[ke]
 ;B[lc]LB[kc:B][pk:A]C['a' is possible, 'b' is not recommended.
+]
 (;W[pk]
 ;B[mi])
 (;W[kc]
 ;B[kb]LB[jb:A][lb:B]C['a' or 'b'.
+]
 (;W[jb]
 ;B[lb]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gc])
 (;W[lb]
 ;B[mb]
 ;W[jb]
 ;B[la]
 ;W[ib]
 ;B[hc]
 ;W[hb]
 ;B[gc])))))
 (;W[me]
 ;B[of]
 ;W[og]
 ;B[qe]
 ;W[pe]
 ;B[pd]
 ;W[rd]
 ;B[ng]))
 (;B[mb]
 ;W[pc]
 ;B[ob]
 ;W[ng])
 (;B[of]
 ;W[og]
 ;B[ng]
 ;W[ne]
 ;B[od]
 ;W[qh]
 ;B[qi]
 ;W[rg]
 ;B[mg]
 ;W[kd]C[Black in trouble.
 ]))
 (;B[qh]
 ;W[nf]
 ;B[mb]
 ;W[pc]
 ;B[ob]
 ;W[nh]))))
 (;W[ld]LB[nd:b][pe:c][of:a]C[Black continues with 'a' to 'c'.]
 (;B[of]
 ;W[qg]C[
 * Joseki *])
 (;B[nd]
 ;W[pf]
 ;B[lc]
 ;W[qj])
 (;B[pe]LB[pd:a][qe:b]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[md]
 ;W[pf]
 ;B[lc])
 (;W[qe]
 ;B[pf]
 ;W[qg]
 ;B[je]
 ;W[lf]
 ;B[pg]
 ;W[qh]
 ;B[ph])))
 (;W[]LB[qf:a][qg:b]C[White plays elsewhere. Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[pe]
 ;B[pf]
 ;W[ne]
 ;B[of]
 ;W[oe]
 ;B[md]LB[pc:a][pj:b]C[White plays 'a' or 'b'.])
 (;B[qg]
 ;W[pe]
 ;B[md]
 ;W[of]
 ;B[qj]
 ;W[pc]
 ;B[ob]
 ;W[pb]C[White 12 is necessary to secure his base in the corner, the price
 for paying elsewhere earlier.])))
 (;B[ic]LB[ld:c][pe:a][pf:b]C[
 -Space Extension = Goken Biraki = Daseochkan Peollim = Chai Wu~
 -----------------------------------------------------------------
 The maximum extension for Black. Black's choice of this extension is influenced by the position in the top-left corner.
 White can answer 'a', 'b' or 'c'. Playing elsewhere is not favorable, as Black can make effective use of this five-space extension. This is a relaxed extension so there are no fierce variations.
+]
 (;W[pe]LB[md:A][nd:B]C['a' or 'b'.]
 (;B[md]C[
 * Joseki *])
 (;B[nd]
 ;W[ne]
 ;B[me]
 ;W[nf]
 ;B[ld]
 ;W[qj]))
 (;W[pf]
 ;B[ld]C[
 * Joseki *]
 ;W[pc]C[Later.]
 ;B[od])
 (;W[ld]LB[pe:b][of:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[of]LB[oe:B][qg:A]C['a' is correct, 'b' is strenghening Black.]
 (;W[qg])
 (;W[oe]
 ;B[ne]
 ;W[pe]
 ;B[nd]
 ;W[nf]
 ;B[mf]
 ;W[ng]
 ;B[le]
 ;W[og]
 ;B[ie]))
 (;B[pe]C[Black 5 is not recommended.]
 ;W[pd]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[md]
 ;W[le]LB[lc:a][nf:b]C[Black cannot connect on the third line at 'a', and pushing at 'b' is bad, as Black extends along the fifth line.])))
 (;B[qf]LB[pc:e][od:c][pe:a][qe:d][pf:b]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 The aim of playing the close pincer of Black 3 is mainly to build influence on the right. Therefore a Black position in the lower right corner is desirable when making this pincer.
 White replies range from 'a', 'b', 'c', 'd' or 'e'. White 'a' is most popular. The other moves indicate a special strategy.
 White cannot play elsewhere, as Black 'a' gives White a very unfavorable result.
 White 'e' is the simplifying variation. It gives a secure corner territory for influence and sente. It isn't considers joseki, because, White gets completely surrounded.
+]
 (;W[pe]
 ;B[pf]LB[pc:d][nd:b][ne:a][oe:c][of:e]C[White continues with 'a', 'b' or 'd'. White 'c' and 'e' have also been played professionally.]
 (;W[ne]LB[lc:c][md:b][of:a]C[The combination of White 4 and 6 was invented by Shusaku, who mentioned in a letter that he contemplated the moves for six hours before playing them.
 Black continues with 'a', possibly 'b'. In the game where Shusaku first played the move (in 1853), his opponent, Ota Yuzo, played at 'c'.]
 (;B[of]LB[nc:b][oe:a]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[lc]LB[ob:b][pb:e][pc:d][md:a][pj:c]C[
 * Joseki *
 White continues with 'a', 'b', 'c' or 'd'.
 'e' is a mistake.]
 (;W[md]
 ;B[mc]
 ;W[pc]LB[rc:a][pj:b]C[Black continues with the tesuji at 'a'. The simple extension at 'b' is a mistake.]
 (;B[rc]LB[ob:A][rd:B]C[Black 13 is a sacrifice tesuji to help Black settle at top.
 'a' is joseki, 'b' is a mistake.]
 (;W[ob]LB[nb:a][rd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nb]
 ;W[od]
 ;B[nc]
 ;W[rd]
 ;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rb]
 ;B[pj])
 (;B[rd]C[Black takes much of the corner....]
 ;W[nc]C[... but White easily gets good eye shape.]
 ;B[ic]))
 (;W[rd]
 ;B[pb]
 ;W[qb]
 ;B[qc]
 ;W[pd]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[nc]
 ;B[nb]
 ;W[od]
 ;B[oa]))
 (;B[pj]C[Black 13 is a mistake (though not an obvious one).]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[ic]))
 (;W[ob]LB[nb:c][pb:a][pc:b]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[pb]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[oa]
 ;W[mc]
 ;B[rb]
 ;W[ld]C[
 * Joseki *])
 (;B[pc]
 ;W[nc]LB[nb:a][nd:b]C[Black continues with the sacrifice at 'a'. Black 'b' just makes Black heavy.]
 (;B[nb]
 ;W[mb]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lb]
 ;B[od]
 ;W[kc]
 ;B[ld]
 ;W[nf])
 (;B[nd]C[Black 13 is a mistake.]
 ;W[nb]
 ;B[md]
 ;W[qc]
 ;B[od]
 ;W[pb]))
 (;B[nb]C[Black 11 is too mild.]
 ;W[pb]LB[jc:a]
 ;B[jc]C[Black must play at top. White at 13 would put Black in considerable difficulty.]
 ;W[pj]CR[nc]C[Now White can ruin Black's hoped-for extension.
 The cutting point at the marked location remains.]))
 (;W[pj]
 ;B[mg]LB[md:a][le:b]C[White has a joseki continuation at 'a'. White 'b' is also playable, but gives Black an attack on the corner.]
 (;W[md]
 ;B[mc]
 ;W[pc]LB[rc:a][dp:b]C[The joseki move is 'a'. If Black plays tenuki ('b'), White can easily settle his stones and grab a bigger corner.]
 (;B[rc]
 ;W[ob]
 ;B[nb]
 ;W[od]
 ;B[nc]
 ;W[rd]
 ;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rb])
 (;B[]C[Black plays elsewhere.]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[ic]))
 (;W[le]C[White 12 gives Black an opportunity to tear into the corner.]
 ;B[qc]
 ;W[rc]
 ;B[pb]
 ;W[qb]
 ;B[pc]LB[re:b][rf:a]C[Black 'a' and 'b' are now forcing moves.]))
 (;W[pc]
 ;B[rc]
 ;W[ob]
 ;B[rd])
 (;W[pb]
 ;B[pc]
 ;W[qc]
 ;B[ob]
 ;W[nf]
 ;B[ng]
 ;W[mg]
 ;B[nh]))
 (;W[nc]LB[nb:a][mc:b]C[Black continues with 'a'. Black 'b' is also possible.]
 (;B[nb]
 ;W[mc]
 ;B[pc]
 ;W[oe]LB[mb:A][qc:B]C['a' or 'b' give the same result.]
 (;B[mb]LB[kc:A][lc:B]C[
 * Joseki *
 'a' is correct, 'b' is inferior.]
 (;W[kc]LB[lc:a][qc:b]C[Black continues with 'a'. Black 'b' is premature.]
 (;B[lc]
 ;W[ld]
 ;B[lb]
 ;W[kd]
 ;B[qc]
 ;W[rd]
 ;B[pj]C[
 * Joseki *]
 ;W[mg]
 ;B[]C[Black plays elsewhere.]
 ;W[kb]C[White 23 is not sente.]
 ;B[]C[Black plays elsewhere.]
 ;W[rb]
 ;B[oa])
 (;B[qc]C[Black 15 is out of order.
 Ishida Yoshio made this mistake against Rin Kaiho in game 2 of the 1971 Honinbo Title match.]
 ;W[rd]
 ;B[lc]
 ;W[ld]
 ;B[lb]
 ;W[pj]LB[kd:b][qm:a]C[White 20 breaks up Black's position.
 The game continued with 'a'. Ishida commented later that a Black
 cut at 'b' was fighting spirit.]
 (;B[qm]C[Game continuation.]
 ;W[mg]
 ;B[oi]
 ;W[kd]C[White is already in better position.]
 ;B[oj]
 ;W[pl]LB[nl:b][ql:a]C[The game continued with Black 'a'. Ishida later commented that 'b' was a better continuation for Black.]
 (;B[ql]C[Game continuation.]
 ;W[ok]
 ;B[qk]
 ;W[pk]
 ;B[mj]
 ;W[pm]
 ;B[pn]
 ;W[on]
 ;B[po]
 ;W[mm])
 (;B[nl]C[Suggested improvement over the game continuation.]
 ;W[pm]
 ;B[qn]
 ;W[nm]
 ;B[mm]
 ;W[nn]
 ;B[ql]))
 (;B[kd]C[Suggested improvement over the game continuation.]
 ;W[le]
 ;B[jd]
 ;W[mi])))
 (;W[lc]LB[lb:A][qc:B]C['a' is correct. 'b' is a mistake.]
 (;B[lb]
 ;W[kc]
 ;B[qc]
 ;W[rd]
 ;B[pj])
 (;B[qc]
 ;W[rd]
 ;B[pj]
 ;W[lb]LB[rc:A][dp:B]C['a' is necessary, tenuki 'b' is wrong.]
 (;B[rc])
 (;B[dp]
 ;W[rb]
 ;B[oa]
 ;W[ma]))))
 (;B[qc]
 ;W[rd]
 ;B[mb]
 ;W[kc]
 ;B[lc]
 ;W[ld]
 ;B[lb]
 ;W[kd]))
 (;B[mc]C[This variation is from a 1959 Japanese professional game (Sugiuchi (White) versus Nakamurs (Black)).]
 ;W[nb]
 ;B[nd]
 ;W[md]
 ;B[od]
 ;W[oe]
 ;B[ob]LB[mb:b][lc:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[lc]
 ;B[mb]
 ;W[lb]
 ;B[na]
 ;W[me]
 ;B[qb]
 ;W[pj]C[Locally, the result is rougly equal, but White should be satisfied with the influence at top, as well as breaking up Black's position on the right.])
 (;W[mb]C[White 16 is a mistake.]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[me]
 ;W[ld]
 ;B[mf]
 ;W[kd]
 ;B[qb]
 ;W[rb]
 ;B[qc]
 ;W[rc]
 ;B[qe]
 ;W[pd]
 ;B[rd]
 ;W[re]
 ;B[sd]
 ;W[se]
 ;B[nf]
 ;W[sc]
 ;B[rd]
 ;W[sd]
 ;B[ra]
 ;W[pa]
 ;B[qa]
 ;W[oa]
 ;B[pc]
 ;W[rd]
 ;B[rf]LB[sa:a]C[White can start a ko at 'a', but he has no ko threats, and so loses.]))))
 (;B[md]LB[pc:B][me:A][of:D][pj:C]C[Black 7 is a pattern developed by Kitani disciples.
 'a' is modern Korean fighting style. 'b' is old Japanese safety style.
 'c' is inferior to 'a'.
 White 'd' is not recommended.]
 (;W[me]
 ;B[ld]
 ;W[pj]
 ;B[of]
 ;W[nd]
 ;B[nc]
 ;W[pc])
 (;W[pc]
 ;B[me]LB[nc:a][nf:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[nc]
 ;B[nf]
 ;W[nd])
 (;W[nf]C[White 10 is not recommended.]
 ;B[od]
 ;W[oe]
 ;B[pi]))
 (;W[pj]
 ;B[oi]
 ;W[qn]LB[qb:a][me:b]C[Professional game examples of continuations include 'a' and 'b'.]
 (;B[qb]LB[lf:b][pi:a]C[Game continuations include 'a' and 'b'.]
 (;W[pi]C[Rin Kaiho (w) versus Fujisawa Shuko in game 2 of the 1970 Meijin title.]
 ;B[og]
 ;W[me]
 ;B[ld]
 ;W[mg]
 ;B[oj]
 ;W[pk]
 ;B[mi]
 ;W[kg]
 ;B[ki]LB[ke:a][ig:b]C[White should continue with 'a', but Rin played 'b'.]
 (;W[ke]C[White 22 is the vital point in this shape.]
 ;B[jc]
 ;W[hf])
 (;W[ig]C[Game continuation. White 22 is thin.]
 ;B[ke]LB[lf:a][jg:b]C[White 17 is the vital point, aiming at 'a' and 'b'.]
 ;W[he]
 ;B[ii]
 ;W[gg]LB[dg:a][jg:b]C[The game continued with 'a', but the splitting move of 'b' is possible.]
 (;B[dg]C[Rin Kaiho (w) versus Fujisawa Shuko = Fujisawa Hideyuki in game 2 of the 1970 Meijin title. Game continuation.]
 ;W[nq]
 ;B[pn]
 ;W[pm]
 ;B[qo]
 ;W[on]
 ;B[po]
 ;W[qm]
 ;B[np]
 ;W[mp]
 ;B[no]
 ;W[or]
 ;B[pr]
 ;W[pq]
 ;B[qq]
 ;W[oq]
 ;B[nl]
 ;W[jq]
 ;B[cn]
 ;W[nd]
 ;B[nc]
 ;W[hc]
 ;B[jc]
 ;W[kf]
 ;B[eo]
 ;W[cl]
 ;B[fq]
 ;W[fr]
 ;B[er]
 ;W[ep]
 ;B[dr]
 ;W[fp]
 ;B[gq]
 ;W[gr]
 ;B[hr]
 ;W[hq]
 ;B[gp]
 ;W[ir]
 ;B[hp]
 ;W[iq]
 ;B[cq]
 ;W[dp]
 ;B[fo]
 ;W[bp]
 ;B[bo]
 ;W[go]
 ;B[ho]
 ;W[gn]
 ;B[do]
 ;W[hn]
 ;B[io]
 ;W[jn]
 ;B[jo]
 ;W[ko]
 ;B[in]
 ;W[co]
 ;B[dn]
 ;W[bn]
 ;B[bm]
 ;W[ao]
 ;B[cm]
 ;W[bl]
 ;B[im]
 ;W[el]
 ;B[fm]
 ;W[br]
 ;B[al]
 ;W[ak]
 ;B[am]
 ;W[fl]
 ;B[gm]
 ;W[di]
 ;B[hh]
 ;W[je]
 ;B[bk]
 ;W[ck]
 ;B[aj]
 ;W[gh]
 ;B[hg]
 ;W[hf]
 ;B[gi]
 ;W[eh]
 ;B[fi]
 ;W[eg]
 ;B[df]
 ;W[dc]
 ;B[ec]
 ;W[cd]
 ;B[ed]
 ;W[cc]
 ;B[gf]
 ;W[fe]
 ;B[be]
 ;W[ce]
 ;B[bf]
 ;W[eb]
 ;B[fb]
 ;W[da]
 ;B[ef]
 ;W[ff]
 ;B[fa]
 ;W[bd]
 ;B[bb]
 ;W[ad]
 ;B[gc]
 ;W[ab]
 ;B[gd]
 ;W[ge]
 ;B[hd]
 ;W[kn]
 ;B[ri]
 ;W[rj]
 ;B[qi]
 ;W[ph]
 ;B[rg]
 ;W[qj]
 ;B[rn]
 ;W[rm]
 ;B[ro]
 ;W[oh]
 ;B[nh]
 ;W[ng]
 ;B[qh]
 ;W[pg]
 ;B[rd]
 ;W[rc]
 ;B[re]
 ;W[qc]
 ;B[qr]
 ;W[hj]
 ;B[hi]
 ;W[hl]
 ;B[hm]
 ;W[bi]
 ;B[lp]
 ;W[mo]
 ;B[lo]
 ;W[ln]
 ;B[mq]
 ;W[mn]
 ;B[lq]
 ;W[mr]
 ;B[lr]
 ;W[kp]
 ;B[ls]
 ;W[jk]
 ;B[jj]
 ;W[kk]
 ;B[gl]
 ;W[lj]
 ;B[ik]
 ;W[li]
 ;B[rb]
 ;W[fk]
 ;B[pc]
 ;W[hk]
 ;B[gk]
 ;W[il]
 ;B[jl]
 ;W[ij]
 ;B[gj]
 ;W[ik]
 ;B[cj]
 ;W[dj]
 ;B[ci]
 ;W[bj]
 ;B[ch]
 ;W[ak]
 ;B[bq]
 ;W[cr]
 ;B[bk]
 ;W[kr]
 ;B[op]
 ;W[ak]
 ;B[dk]
 ;W[dl]
 ;B[bk]
 ;W[ns]
 ;B[ps]
 ;W[ak]
 ;B[fh]
 ;W[fg]
 ;B[bk]
 ;W[ks]
 ;B[os]
 ;W[ak]
 ;B[hs]
 ;W[is]
 ;B[bk]
 ;W[kq]
 ;B[nr]
 ;W[ak]
 ;B[dq]
 ;W[aq]
 ;B[bk]
 ;W[nq]
 ;B[ms]
 ;W[ak]
 ;B[ar]
 ;W[as]
 ;B[bk]
 ;W[an]
 ;B[jm]
 ;W[ak]
 ;B[lh]
 ;W[ll]
 ;B[kh]
 ;W[mh]
 ;B[bk]
 ;W[of]
 ;B[sc]
 ;W[ak]
 ;B[ej]
 ;W[ek]
 ;B[bk]
 ;W[jh]
 ;B[ji]
 ;W[ak]
 ;B[mk]
 ;W[lk]
 ;B[bk]
 ;W[id]
 ;B[ic]
 ;W[ak]
 ;B[fs]
 ;W[gs]
 ;B[bk]
 ;W[cf]
 ;B[cg]
 ;W[ak]
 ;B[bs]
 ;W[cs]
 ;B[bk]
 ;W[jd]C[White wins by resignation.])
 (;B[jg]
 ;W[jf]
 ;B[kf]
 ;W[jh]
 ;B[lg]
 ;W[ph]
 ;B[oh]
 ;W[lh]
 ;B[lf]
 ;W[ji]
 ;B[li]
 ;W[jj]C[White 38 gives White good center position, which is a good reason for Black to reserve the splitting move that begins this sequence until later.])))
 (;W[lf]C[Hane (w) versus Takagawa in the 1973 Pro Best Ten title.]
 ;B[ld]
 ;W[pc]
 ;B[pb]
 ;W[od]
 ;B[nd]
 ;W[of]
 ;B[pi]
 ;W[qj]
 ;B[qi]C[White is thin in the upper right, but has sente.]
 ;W[nq]LB[kd:b][rd:a]C[Black has a move at 'a', while White can later aim at 'b'.]
 (;B[rd]C[White now faces a dilemma: if he tries to prevent Black from connecting, he faces a ko which he cannot afford to lose, owing the his thin shape.])
 (;B[]C[Later in the game, if White has secured his shape in the upper right corner...]
 ;W[nc]C[... a setup move.]
 ;B[ob]
 ;W[kd]C[White plays a tough forcing move.
 This is only possible with a more established shape than shown for White's stones in the upper right.]
 ;B[kc]
 ;W[jc])))
 (;B[me]C[Black 11 was played by Ishida Yoshio against Iwata in game 4 of the 1971 Pro Best Ten playoff.]
 ;W[pc]
 ;B[fh]
 ;W[fd]
 ;B[fc]
 ;W[cc]
 ;B[cb]
 ;W[dd]
 ;B[ec]
 ;W[bc]LB[od:a][nf:b]C[Black continued with 'a'.
 Blocking at 'b' would have been a mistake.]
 (;B[od]C[Game continuation.]
 ;W[oe]
 ;B[pi]
 ;W[nd]
 ;B[nc]
 ;W[pb]
 ;B[qj]
 ;W[qq]LB[mc:a]C[White 22 is big.
 White has left the cut at 'a' for later.])
 (;B[nf]C[Blocking at 21 makes Black overconcentrated in light of White 8.]
 ;W[nc])))
 (;W[of]C[White 8 is not recommended.]
 ;B[ph]
 ;W[pc]
 ;B[od]))
 (;B[lc]C[Shusaku versus Ota Yuzo in game 17 of what was supposed to be a 30-game title match; 1853-06-05.]
 ;W[pk]
 ;B[of]
 ;W[oe]
 ;B[mg]
 ;W[md]
 ;B[mc]
 ;W[pc]LB[rc:b][oo:a]C[Black continued with 'a', but should have played the placement of 'b' first.]
 (;B[oo]C[The actual game continuation.]
 ;W[kd]C[Because Black failed to play in the corner, White gets the forcing move of 16.]
 ;B[jc]
 ;W[mq]
 ;B[nk]
 ;W[pi]
 ;B[nf]
 ;W[qm]
 ;B[mo]
 ;W[qh]
 ;B[lq]
 ;W[lr]
 ;B[nq]
 ;W[kq]
 ;B[nr]
 ;W[lp]
 ;B[pm]
 ;W[pl]
 ;B[om]
 ;W[qn]
 ;B[ro]
 ;W[pn]
 ;B[po]
 ;W[np]
 ;B[op]
 ;W[on]
 ;B[no]
 ;W[ld]
 ;B[nm]
 ;W[kn]
 ;B[ni]
 ;W[ci]
 ;B[dj]
 ;W[di]
 ;B[ej]
 ;W[bk]
 ;B[eq]
 ;W[ep]
 ;B[fq]
 ;W[dp]
 ;B[go]
 ;W[hq]
 ;B[gq]
 ;W[hp]
 ;B[fo]
 ;W[fm]
 ;B[hr]
 ;W[ir]
 ;B[dr]
 ;W[cr]
 ;B[fr]
 ;W[hm]
 ;B[cs]
 ;W[bs]
 ;B[ds]
 ;W[bq]
 ;B[gs]
 ;W[is]
 ;B[hs]
 ;W[cf]
 ;B[gl]
 ;W[gm]
 ;B[ei]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[ic]
 ;W[rn]
 ;B[dg]
 ;W[cg]
 ;B[jf]
 ;W[bd]
 ;B[bc]
 ;W[dd]
 ;B[cc]
 ;W[de]
 ;B[ik]
 ;W[ge]
 ;B[hf]
 ;W[gf]
 ;B[gg]
 ;W[fg]
 ;B[gh]
 ;W[gc]
 ;B[hd]
 ;W[eb]
 ;B[dc]
 ;W[fc]
 ;B[be]
 ;W[gb]
 ;B[db]
 ;W[fh]
 ;B[gi]
 ;W[eh]
 ;B[mb]
 ;W[lf]
 ;B[lg]
 ;W[mp]
 ;B[oq]
 ;W[so]
 ;B[sp]
 ;W[sn]
 ;B[rq]
 ;W[kl]
 ;B[re]
 ;W[rc]
 ;B[kk]
 ;W[jl]
 ;B[jk]
 ;W[kf]
 ;B[kg]
 ;W[ho]
 ;B[rg]
 ;W[rh]
 ;B[ed]
 ;W[ee]
 ;B[cl]
 ;W[ck]
 ;B[dl]
 ;W[dk]
 ;B[en]
 ;W[bl]
 ;B[ag]
 ;W[gk]
 ;B[hk]
 ;W[ml]
 ;B[ll]
 ;W[mm]
 ;B[mk]
 ;W[lm]
 ;B[bh]
 ;W[fl]
 ;B[gj]
 ;W[ie]
 ;B[he]
 ;W[je]
 ;B[if]
 ;W[hc]
 ;B[id]
 ;W[ib]
 ;B[jb]
 ;W[em]
 ;B[dn]
 ;W[bf]
 ;B[af]
 ;W[ce]
 ;B[ad]
 ;W[cn]
 ;B[ek]
 ;W[ja]
 ;B[fd]
 ;W[gd]
 ;B[fe]
 ;W[ff]
 ;B[ch]
 ;W[dh]
 ;B[ea]
 ;W[fb]
 ;B[mf]
 ;W[me]
 ;B[sh]
 ;W[si]
 ;B[sg]
 ;W[rj]
 ;B[bj]
 ;W[cj]
 ;B[bi]
 ;W[lk]
 ;B[lj]
 ;W[oh]
 ;B[lo]
 ;W[ko]
 ;B[nh]
 ;W[rd]
 ;B[ka]
 ;W[ia]
 ;B[na]
 ;W[pb]
 ;B[kc]
 ;W[se]
 ;B[oj]
 ;W[pj]
 ;B[fk]
 ;W[jd]
 ;B[cm]
 ;W[bm]
 ;B[gn]
 ;W[hn]
 ;B[il]
 ;W[im]
 ;B[mr]
 ;W[fa]
 ;B[da]
 ;W[oa]
 ;B[ma]
 ;W[ms]
 ;B[ns]
 ;W[ls]
 ;B[ak]
 ;W[al]
 ;B[aj]
 ;W[og]
 ;B[fi]
 ;W[hl]
 ;B[pg]
 ;W[od]
 ;B[gk]
 ;W[ll]C[White wins by 3.])
 (;B[rc])))
 (;W[nd]LB[mc:a][nc:b][qc:c]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[mc]LB[pc:a][qj:b]C[White continues with 'a' or 'b'.]
 (;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[md])
 (;W[qj]
 ;B[of]
 ;W[oe]
 ;B[nf]
 ;W[md]
 ;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[lf]))
 (;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld]
 ;B[kc]LB[pi:A][qj:B]C['a' or 'b'.]
 (;W[pi]
 ;B[of]
 ;W[oe]
 ;B[nf]
 ;W[lf]C[
 * Joseki *])
 (;W[qj]
 ;B[nf]
 ;W[oe]
 ;B[of]
 ;W[lf]))
 (;B[qc]C[Black 7 is too territory oriented in emphasizing the corner.]
 ;W[rc]
 ;B[pc]
 ;W[oe]
 ;B[rb]
 ;W[rd]
 ;B[mb]
 ;W[qj]
 ;B[ng]
 ;W[ld]))
 (;W[oe]C[White 6 was played by Fujisawa Shuko = Fujisawa Hideyuki against Yoshio Ishida in the 1974 Meijin league. The game continuation follows.]
 ;B[of]
 ;W[ne]
 ;B[lc]
 ;W[pk]
 ;B[]C[Black plays elsewhere.]
 ;W[md]
 ;B[mc]
 ;W[pc]
 ;B[rc]
 ;W[ob]
 ;B[nb]
 ;W[od]
 ;B[nc]
 ;W[rd]
 ;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rb])
 (;W[pc]LB[nd:B][oe:A]C['a' or 'b'.]
 (;B[oe]
 ;W[ob]
 ;B[od]
 ;W[nb])
 (;B[nd]))
 (;W[of]C[Sakata Eio 9P played the move against Kitani Minoru 9P 1959.]
 ;B[oe]
 ;W[od]
 ;B[ne]
 ;W[nd]
 ;B[og]
 ;W[md]
 ;B[nf]
 ;W[pc]))
 (;W[pf]LB[pg:a][qg:b]C[Black continues with 'a'. Black 'b' is playable, but not so good by itself.]
 (;B[pg]LB[od:c][pe:a][of:b]C[White continues with 'a', 'b' or 'c'.]
 (;W[pe]LB[lc:B][og:C][qh:A]C['a', 'b' or 'c'.]
 (;B[qh]LB[lc:a][mc:c][nd:b]C[White continues with 'a' or 'b'.
 'c' is a mistake.]
 (;W[lc]LB[qb:c][nd:b][ng:a]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[ng]
 ;W[nd]C[
 * Joseki *]
 ;B[rc]C[This is Black's continuation from the joseki.]
 ;W[qc]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[pc]
 ;B[rd])
 (;B[nd]
 ;W[nf]
 ;B[ld]
 ;W[kd]
 ;B[le]
 ;W[mc]
 ;B[ne]
 ;W[og])
 (;B[qb]C[Black 'c' is not recommended.]
 ;W[nf]LB[rc:a][og:b]C[Black continues with 'a'. Black 'b' and Black lives in the corner in gote.]
 (;B[rc]
 ;W[og]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[ni]
 ;B[oj]
 ;W[rd])
 (;B[og]
 ;W[nd]
 ;B[rc]
 ;W[rd]
 ;B[nc]
 ;W[mc]
 ;B[qc])))
 (;W[nd]C[If White wants to play a good point elsewhere, he can take sente with White 8. The idea is to switch elsewhere, answering Black lightly if he plays locally.]
 ;B[mc]LB[nc:b][dp:a]C[White may play elsewhere ('a'), or make Black overconcentrated while getting good shape ('b').]
 (;W[]LB[qb:B][md:A]C[White plays elsewhere.
 'a' surrounds a living White group. 'b' makes a low living Black position to hunt White.]
 (;B[md]C[Black's continuation when White plays elsewhere.]
 ;W[pc]
 ;B[od]
 ;W[rf]
 ;B[nf]
 ;W[rg]
 ;B[qg]
 ;W[qe]LB[nh:a]C[Black 'a' rounds off Black's shape, but may not be necessary.])
 (;B[qb]
 ;W[nc]
 ;B[nb]
 ;W[ob]
 ;B[pb]
 ;W[od]
 ;B[oa]
 ;W[le]))
 (;W[nc]
 ;B[nb]
 ;W[ob]
 ;B[pb]
 ;W[od]
 ;B[oa]
 ;W[le]))
 (;W[mc]
 ;B[ng]
 ;W[ne]
 ;B[rc]
 ;W[qc]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[pc]
 ;B[rd]TR[mc]C[Now, the triangled White stone is one line too narrow.]))
 (;B[lc]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[ph]
 ;W[rf]LB[qb:A][pc:B]C[Later continuations are Black 'a' or White 'b'.])
 (;B[og]
 ;W[ne]
 ;B[lc]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[rf]))
 (;W[of]LB[qe:c][og:b][qg:a]C[Black continues with 'a' to 'c'.]
 (;B[qg]
 ;W[od]LB[pc:a][nd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pc]
 ;W[pd]LB[mc:a][qc:b][nd:c]C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
 (;B[mc]C[
 * Joseki *]
 ;W[qk]
 ;B[pj]
 ;W[pk]
 ;B[oj]
 ;W[ok]
 ;B[nj]
 ;W[mf]
 ;B[jc])
 (;B[qc]C[Black 11 is not recommended. White gets superior thickness.]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[qk]
 ;W[lb])
 (;B[nd]C[Black 11 is pointless, as White already has a solid position.]
 ;W[qc]C[Letting White play 12 in sente is a loss for Black.]
 ;B[mc]
 ;W[mf]LB[jc:a][pj:b]C[White 14 makes sente of 'a' and 'b'.]))
 (;B[nd]C[Black 9 is not recommended.]
 ;W[pc]LB[nc:a][oe:b]C[Black continues at 'a'. Black 'b' is not recommended.]
 (;B[nc]
 ;W[ne]
 ;B[ld]
 ;W[qe]
 ;B[qk]
 ;W[jc])
 (;B[oe]
 ;W[pe]
 ;B[pd]
 ;W[pb]LB[od:b][qe:a]C[Black continues with 'a' or 'b'; neither is appealing.]
 (;B[qe]
 ;W[od]CR[ne]C[Black will have to have a very big ko threat for White not to take Black 11 (the marked location).])
 (;B[od]
 ;W[qe]))))
 (;B[og]LB[od:a][nf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[od]LB[pc:a][nf:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[pc]
 ;W[pd]
 ;B[mc]LB[ng:a][qg:b]C[White continues with the hane at 'a'. The cut at 'b' is a mistake.]
 (;W[ng]LB[nh:B][qi:A]C[White 12 is the crucial point for both sides.
 'a' creates a snall group, 'b' influences the right side.]
 (;B[qi]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[jc]
 ;W[nh]LB[mf:b][nf:a]C[If Black 'a', White 'b'.])
 (;B[nh]C[The move was played by Honinbo Shuwa against Honinbo Shusaku, Oct 14th 1849.]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[mg]
 ;W[nf]
 ;B[rh]
 ;W[rf]
 ;B[oi]))
 (;W[qg]C[White 12 is a mistake.]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[rf]
 ;B[ng]C[Black takes the crucial point.]))
 (;B[nf]C[Black 9 is an overplay that gives White a big corner.]
 ;W[nd]
 ;B[ng]
 ;W[pc]LB[qg:a]C[The cut at 'a' is still and issue.]))
 (;W[nf]C[White 8 is a mistake.]
 ;B[qe]
 ;W[pd]
 ;B[ng]
 ;W[mf]
 ;B[lc]))
 (;B[qe]
 ;W[pd]LB[od:a][pe:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[od]
 ;W[pe]
 ;B[qh]
 ;W[pc]
 ;B[kc]C[
 * Joseki *
 The joseki ends.]
 ;W[mc]C[This is not much help for White now.]
 ;B[md]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mb])
 (;B[pe]C[Black 9 is a mistake.]
 ;W[od]C[White easily gets superior territory by sacrificing the two stones.]
 ;B[oe]
 ;W[nd]
 ;B[ne]
 ;W[md])))
 (;W[od]LB[pc:a][nd:b]C[White 6 is a light way of playing.
 Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[of]
 ;B[pd]
 ;W[qe]
 ;B[qg]
 ;W[pe]LB[qc:b][nd:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nd]
 ;W[qc]
 ;B[og]
 ;W[nf]
 ;B[ld])
 (;B[qc]C[Black 13 is not recommended.]
 ;W[md]LB[mb:a][nd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[mb]
 ;W[nh]
 ;B[pj]LB[lb:a]C[White 'a' is a severe follow-up move.])
 (;B[nd]C[Black 15 is not recommended.]
 ;W[nc]
 ;B[oe]
 ;W[ne]
 ;B[od]
 ;W[mc])))
 (;B[nd]LB[pc:b][of:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[of]LB[pc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[pd]
 ;B[qc]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[ph]
 ;W[rf])
 (;B[pd]
 ;W[pc]
 ;B[oe]
 ;W[pe]
 ;B[od]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[qc]
 ;W[rc]
 ;B[pb]
 ;W[rh]
 ;B[rd]
 ;W[qe]
 ;B[rb]))
 (;W[pc]C[White 8 is a mistake.]
 ;B[oe]
 ;W[pd]LB[nc:b][pe:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]LB[nc:a][ne:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[nc]
 ;B[md]LB[ob:a][dp:b]C[White takes at 'a'. Not taking the stone ('b') is a mistake.]
 (;W[ob]
 ;B[lc])
 (;W[]LB[ob:a]C[White fails to take at 'a'.]
 ;B[ob]C[Black aims to sacrifice the two stones to get thickness by squeezing
 White.]
 ;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[mc]
 ;W[oa]))
 (;W[ne]C[White 12 is a mistake.]
 ;B[nc]
 ;W[me]
 ;B[kc]LB[rd:c][qe:b][of:a]C[White does not have a good follow-up.
 White would like to play 'a', causing Black 'b', which threatens Black playing 'c'; that would be a disaster.]))
 (;B[nc]C[Black 11 is a mistake.]
 ;W[of]C[White splits Black in two.])))))
 (;B[qg]C[The idea behind Black 5 is not to give White momentum, but the move does little for Black either.]
 ;W[pe]LB[lc:a][pi:b]C['a' and 'b' are miai.]
 ;B[lc]
 ;W[pi]LB[pg:A][qi:B]
 (;B[pg]
 ;W[og]
 ;B[ri]
 ;W[nd]C[A sente forcing move by White.]
 ;B[nc]
 ;W[qj]
 ;B[rj]
 ;W[qk]C[Black has a low position on the right.])
 (;B[qi]LB[nd:a][qj:b]C[Black can play 9 with a favorable ladder.
 White continues with 'a' if the ladder is unfavorable to White, or 'b' if the ladder is favorable.]
 (;W[nd]
 ;B[nc]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[qk]
 ;W[pl])
 (;W[qj]C[White must have the ladder to play this way.]
 ;B[pj]
 ;W[qh]
 ;B[ri]
 ;W[oi]
 ;B[rh]
 ;W[pk]
 ;B[oh]
 ;W[oj]C[The ponnuki is excellent shape for White.]
 ;B[og]
 ;W[pc]C[White secures the corner in sente.]
 ;B[od]))))
 (;W[od]C[White 4 is a simple move that gives a less satisfactory result than variations 'a' and 'b'.]
 ;B[nd]LB[oe:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[pc]
 ;W[qe]LB[qc:a][pf:d][pg:b][qh:c]C[Black continues with 'a' if he doesn't bother about the right side.
 'b' is the traditional move to develop the right side.
 'c' is an alternative to 'b' in virtue of better shape and a trick move.
 Black 'd' is mistake.]
 (;B[qc]LB[ne:B][qh:A]C['a' is joseki. 'b' is possible, if White is strong in the lower right.]
 (;W[qh]LB[ne:A][qg:C]C[
 * Joseki *
 Now 'a' is a big sente move for both sides. Another continuation
 for Black is 'c'.]
 (;B[ne]
 ;W[pf]
 ;B[jc]C[Eight points for White have been solidified, but Black has gained
 more points.])
 (;W[ne]
 ;B[md]LB[qf:3][qg:A]C[White prevented a big Black sente move and capture Black 3, who cannot escape on 'a' now, although his aji may used more indirectly.]
 ;B[qg]
 ;W[ph]
 ;B[of]
 ;W[og]
 ;B[nf]
 ;W[pf]
 ;B[pg]
 ;W[pe]
 ;B[oh]
 ;W[ng]LB[mf:A][nh:B]
 (;B[mf]
 ;W[nh]LB[rh:B][oi:A]
 (;B[oi]
 ;W[rg])
 (;B[rh]
 ;W[ri]
 ;B[rg]
 ;W[oi]
 ;B[re]
 ;W[rd]
 ;B[sf]
 ;W[sh]
 ;B[me]
 ;W[si]
 ;B[sg]LB[rc:B][sd:A]C['a' is correct. 'b' is a mistake.]
 (;W[sd]
 ;B[rc]
 ;W[se]
 ;B[pd]
 ;W[rf])
 (;W[rc]
 ;B[rb]LB[sb:A][sd:B]C['a' is ko, 'b' is a failure.]
 (;W[sb]
 ;B[sd]
 ;W[qb]
 ;B[ra]
 ;W[qa]
 ;B[pb]
 ;W[sa]
 ;B[rb]
 ;W[ra]
 ;B[pa]
 ;W[sc]
 ;B[pd]
 ;W[se])
 (;W[sd]
 ;B[pd]))))
 (;B[nh]
 ;W[mf]))
 (;B[qg]C[Black must consider carefully before setting this sequence in motion.]
 ;W[ph]
 ;B[of]
 ;W[ne]
 ;B[og]
 ;W[md]
 ;B[nc]C[Black having to connect this way is painful. This is the cost of activating Black 3 without further play by Black at top.]
 ;W[me]))
 (;W[ne]LB[md:A][pg:B]C['a' is easy, 'b' starts a fight.]
 (;B[md]
 ;W[qh])
 (;B[pg]
 ;W[md]
 ;B[nc]
 ;W[pi])))
 (;B[pg]LB[qc:A][og:B]TR[qh]C[Black 9 emphasizes the right side, but leaves a weak point on
 the triangled position.
 White 'a' is joseki, 'b' is a mistake.]
 (;W[qc]
 ;B[ng]LB[qb:D][nc:D][md:E][ne:C][nf:A][mg:B]C['a' is joseki, and 'b' is disadvantageous.
 White 'c' is helping Black.
 White can simply secure his corner and take sente with 'd'.]
 (;W[nf]LB[lc:A][mg:B]C['a' is joseki.
 'b' aims to punish White, but is an overplay.
 If you know a better explanation why 'b' is disadvantageous than the one presented here, please email kogo@waterfire.us.]
 (;B[lc]
 ;W[mg]C[This move is helping Black, but that is okay in the overall balance of the joseki.]
 ;B[nh]LB[md:A][lf:B]TR[qh]C[Black must provoke being forced to this move, because it defends against invasions on the triangled point.
 'a' is usual, 'b' the old way.]
 (;W[md]
 ;B[nc]
 ;W[lf]LB[qj:A][ql:B]C[
 * Joseki *
 'a' or 'b'.]
 (;B[qj])
 (;B[ql]))
 (;W[lf]LB[qj:A][ql:B]C[
 'a' or 'b'.]
 (;B[qj])
 (;B[ql])))
 (;B[mg]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]LB[na:b][md:a]C[White 'a' is correct.
 White 'b' is a mistake, it takes the corner, but gives Black huge thickness.]
 (;W[md]C[With White 18, White gets out at the top, while Black makes a low group at top.]
 ;B[na]
 ;W[ne]
 ;B[ob]
 ;W[kc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[rc]
 ;B[kb]
 ;W[jb]
 ;B[lc]
 ;W[ld]
 ;B[jc]
 ;W[kd]
 ;B[la]
 ;W[ic]CR[oh]LB[oa:E][nd:D][mg:13][qj:C][pk:A][qk:B]TR[qh]C[The result is bad for Black. But the reason is not just Black's top group being pressed down, as White didn't get much points with his stones between the two Black groups. Black is in a bad position because of the triangled weakness in his wall on the right: He will either have to repair it with a stone too close to the wall or suffer severe invasions on the triangled point.
 In comparison to the joseki, one can see that Black 13 is inefficiently placed, Black failed to let himself being pushed onto the squared position, which would help against invasion on the triangled point by making impossible a kikashi on the circled point. Black 'a', 'b' or 'c' fail.
 Later, White 'd' is sente against the top group and must be answered on 'e'.]MA[nh]
 (;B[pk]MA[nf][mg]
 ;W[qh]LB[rf:A][ph:B]C['a' or 'b'.]
 (;B[rf]
 ;W[oh]LB[og:B][ph:A]C['a' or 'b'.]
 (;B[ph]
 ;W[pi]
 ;B[qi]
 ;W[qj]
 ;B[oi]
 ;W[ri]
 ;B[pj]
 ;W[qi]
 ;B[og]
 ;W[oj]
 ;B[ni]
 ;W[ql])
 (;B[og]
 ;W[qj]LB[ph:A][qk:B]C['a' or 'b'.]
 (;B[ph]
 ;W[pi]
 ;B[oi]
 ;W[oj]
 ;B[ni]
 ;W[pj]
 ;B[ok]
 ;W[qk]
 ;B[nj]
 ;W[pm])
 (;B[qk]
 ;W[oj])))
 (;B[ph]
 ;W[qj]LB[qi:A][qk:B]C['a' or 'b'.]
 (;B[qi]
 ;W[ri]
 ;B[pi]
 ;W[rg]
 ;B[rf]
 ;W[qk]
 ;B[pl]
 ;W[qm])
 (;B[qk]
 ;W[pi]
 ;B[oi]
 ;W[rf]LB[qg:A][rg:B]C['a' or 'b'.]
 (;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qi]
 ;B[rj]
 ;W[ri]
 ;B[pj]
 ;W[sh]
 ;B[nj])
 (;B[rg]
 ;W[qg]
 ;B[pf]
 ;W[rh]))))
 (;B[qk]
 ;W[qh]LB[rg:A][ph:B]C['a' or 'b'.]
 (;B[rg]
 ;W[oh]
 ;B[og]
 ;W[pj])
 (;B[ph]
 ;W[qj]
 ;B[pj]
 ;W[pi]
 ;B[oi]
 ;W[qi]
 ;B[pk]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[pf]
 ;W[rh]))
 (;B[qj]
 ;W[qm]LB[qh:B][oj:A]C[As Black's space on the left is small, White might first approach from the outside to take outside territory if Black defends on 'a' or invade on 'b' if he doesn't. Black can expect no good results from his narrow extension.]
 (;B[oj]
 ;W[qp])
 (;W[qh]LB[rf:A][ph:B]C['a' or 'b'.]
 (;B[rf]
 ;W[oh]
 ;B[og]
 ;W[pk]C[Black pressed down on the right.])
 (;B[ph]
 ;W[rf]LB[qg:A][rg:B]C['a' is correct. 'b' is a mistake.]
 (;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qp]
 ;W[ri]C[Later]
 ;B[qi]
 ;W[sh])
 (;B[rg]
 ;W[qg]
 ;B[rh]
 ;W[qi]
 ;B[pf]
 ;W[ri]
 ;B[re]
 ;W[pi]C[Black tricked.])))))
 (;W[na]C[White takes the corner, giving Black considerable thickness.]
 ;B[md]
 ;W[pb]
 ;B[mf]C[Black's thickness may be considered superior to White's corner.])))
 (;W[mg]LB[me:C][ne:A][nf:D][nh:B]C[Black can cut with 'a'.
 'b' reverts to joseki.
 'c' and 'd' fail.]
 (;B[ne]LB[nf:A][of:B]C[
 'a' is better than 'b'.]
 (;W[nf]
 ;B[of]
 ;W[mf]LB[lc:b][mc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mc]LB[qb:B][rf:A][dp:C]C[White has to live on 'a'. Living on 'b' gives less points. Tenuki 'c' and White dies in the corner.]
 (;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[ra]
 ;B[nh])
 (;W[qb]
 ;B[re]
 ;W[rd]
 ;B[rf]
 ;W[rb]
 ;B[pb]
 ;W[sc])
 (;W[dp]LB[rb:B][re:A]C[Black kills on 'a' and fails on 'b'.]
 (;B[re]
 ;W[rd]
 ;B[rb])
 (;B[rb]
 ;W[qb]
 ;B[re]
 ;W[ra]
 ;B[sb]
 ;W[sd])))
 (;B[lc]C[Black 17 is a mistake.]
 ;W[ob]LB[nb:a][pb:b]C[Black continues with 'a'. Black cannot resist with 'b'.]
 (;B[nb]
 ;W[pb])
 (;B[pb]C[Black 19 is a mistake.]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[md]
 ;W[mb])))
 (;W[of]
 ;B[nf]
 ;W[og]
 ;B[oh]C[Black's wall is superior.]))
 (;B[nh]
 ;W[nf]
 ;B[lc]
 ;W[lf]C[
 * Joseki *]
 ;B[qk])
 (;B[me]C[Black 13 is a mistake.]
 ;W[nf])
 (;B[nf]C[Black 13 is a mistake.]
 ;W[ne]
 ;B[me]
 ;W[nc]LB[mc:b][md:a]C[Black continues with 'a' or 'b'.]
 (;B[md]
 ;W[nb])
 (;B[mc]
 ;W[md]
 ;B[ld]
 ;W[mb]
 ;B[nd]
 ;W[nb]
 ;B[lb]
 ;W[md]
 ;B[lc]
 ;W[pb])))
 (;W[ne]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[le]
 ;B[kd]
 ;W[lg]
 ;B[qk])
 (;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ne]
 ;B[md]
 ;W[pb]
 ;B[ob]
 ;W[pd]
 ;B[na]
 ;B[rb]
 ;W[qb]
 ;B[rf]
 ;W[re]
 ;B[pa]
 ;W[ra]LB[sb:A][sc:B]
 (;B[sb]
 ;W[rc]
 ;B[sd]
 ;W[se]
 ;B[sc])
 (;B[sc]
 ;W[rc]
 ;B[se]
 ;W[sb]))
 (;W[md]
 ;B[ne]
 ;W[nc]
 ;B[mc]LB[nb:B][nf:A]
 (;W[nf]
 ;B[me])
 (;W[nb]
 ;B[mb]
 ;W[of]
 ;B[nf]
 ;W[og]
 ;B[oh]
 ;W[ph]))
 (;W[qb]LB[mc:A][nc:B]C[Black answers on 'a'. If he plays tenuki, Black later takes points in sente on 'b'.]
 (;B[mc])
 (;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[md])))
 (;W[og]
 ;B[oh]
 ;W[ng]
 ;B[qc]LB[ph:A]C[White doesn't get much, even if he cut at 'a'.]
 ;W[ph]
 ;B[pi]
 ;W[qh]
 ;B[qi]))
 (;B[qh]LB[qc:B][og:A]C['a' gets White more influence than 'b'.
 'b' is getting tricked.]
 (;W[og]LB[qc:C][pj:A][qk:B]C['a' is usual. 'b' if Black wants to be safe on the right.
 'c' denies White a base but gives him influence, while Black is pressed down on the right side.]
 (;B[pj]
 ;W[qc]
 ;B[kc])
 (;B[qk]
 ;W[qc]
 ;B[kc]
 ;W[pi]
 ;B[qi])
 (;B[qc]
 ;W[pi]
 ;B[qi]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[ql]
 ;W[om]
 ;B[qn]
 ;W[lc]))
 (;W[qc]
 ;B[ng]CR[pg]LB[qh:9]C[This is better shape than the traditional joseki where Black 9 is on the circled spot.]
 ;W[nf]LB[lc:B][mg:A]C[In contrast to the joseki, Black can now play 'a' instead of 'b' without developing bad shape on the right side.]
 (;B[mg]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[md]
 ;B[na]
 ;W[ne]
 ;B[ob]
 ;W[kc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[rc]
 ;B[lc]
 ;W[ld]
 ;B[kb]
 ;W[jb]
 ;B[jc]
 ;W[kd]
 ;B[la]
 ;W[ic]
 ;B[pm]LB[qh:9]TR[pg]C[White has no severe invasion as he would have if Black 9 were on the triangled point. So White is tricked.]
 ;W[rf]
 ;B[rg]
 ;W[pf]
 ;B[qg])
 (;B[lc]LB[mg:A][og:B]C['a' is correct. 'b' is a mistake.]
 (;W[mg]
 ;B[nh]
 ;W[lf]LB[pl:A][pn:B]C['a' or, dependent on the lower right corner, 'b'. 'b' still allows an invasion.]
 (;B[pl]
 ;W[rf]
 ;B[rg]
 ;W[pf]
 ;B[qg])
 (;B[pn]LB[pf:A][qj:B]C['a' doesn't damage much. 'b' makes a small life for huge influence.]
 (;W[pf]
 ;B[rf]
 ;W[ph]
 ;B[pi]
 ;W[oh]
 ;B[oi]
 ;W[of]
 ;B[ni])
 (;W[qj]
 ;B[ql]
 ;W[oj]
 ;B[rj]
 ;W[ri]
 ;B[qi]
 ;W[rk]
 ;B[pj]
 ;W[qk]
 ;B[pk]
 ;W[sj]
 ;B[rl]
 ;W[rh]
 ;B[rg]
 ;W[sh]
 ;B[sl]
 ;W[sk]
 ;B[oi])))
 (;W[og]
 ;B[oh]LB[mg:A][nh:B]C[After 'a' Black has been strengthened, after 'b', White has been tricked.]
 (;W[mg]
 ;B[nh]
 ;W[lf]
 ;B[pm])
 (;W[nh]
 ;B[mg]
 ;W[ph]
 ;B[oi]
 ;W[pg]
 ;B[pi]
 ;W[mf]
 ;B[lg]
 ;W[qg]
 ;B[lf]
 ;W[qi]
 ;B[qj]
 ;W[rh]
 ;B[pk])))))
 (;B[pf]
 ;W[qc]LB[ld:A][pi:B]C[White is safe and can attack on 'a' or 'b'.]))
 (;W[pf]LB[pd:A][pg:C][qg:B]C['a', 'b' or 'c'.]
 (;B[pd]
 ;W[qe]
 ;B[pe]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[of]
 ;W[pg]
 ;B[qc]
 ;W[re]
 ;B[rd]
 ;W[sf])
 (;B[qg]
 ;W[pc]
 ;B[oe]
 ;W[pd])
 (;B[pg]
 ;W[of]
 ;B[pc]
 ;W[qc]
 ;B[pd]
 ;W[qe]
 ;B[qg]
 ;W[pe]
 ;B[kc])))
 (;W[qe]LB[pf:b][pg:a]C[Joseki continues with Black 'a'. Black 'b' has been played professionally, but is not recommended.]
 (;B[pg]LB[od:a][oe:b]C[White continues with 'a' or 'b'.]
 (;W[od]
 ;B[nd]LB[ne:b][oe:a]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[pb]
 ;W[qb]
 ;B[qc]
 ;W[rc]
 ;B[pc]
 ;W[rb]LB[re:A][ng:B]C['A '' is correct, 'b' is premature.]
 (;B[re]
 ;W[rd]
 ;B[ng]
 ;W[nf]
 ;B[lc]
 ;W[mg]
 ;B[nh]
 ;W[lf]C[
 * Joseki *])
 (;B[ng]
 ;W[nf]
 ;B[lc]
 ;W[mg]
 ;B[nh]
 ;W[re]))
 (;W[ne]LB[md:A][oe:B]C['a' or 'b'.]
 (;B[md]
 ;W[of]
 ;B[pc]
 ;W[me]
 ;B[ld]
 ;W[og])
 (;B[oe]
 ;W[of]
 ;B[pd]
 ;W[pe]
 ;B[od]
 ;W[pf]
 ;B[qc]
 ;W[me]
 ;B[lc]
 ;W[rc])))
 (;W[oe]LB[lc:a][md:b]C[Black continues with 'a' or 'b'.]
 (;B[lc]
 ;W[pc]
 ;B[ob]
 ;W[pb])
 (;B[md]
 ;W[nf]LB[pc:a]C[Black will probably extend down the right next, so White gets a base with 'a'.])))
 (;B[pf]C[Black 5 was played by Handa Dogen against Kitani Minoru in round 2 of the 18th (1963) Honinbo League.]
 ;W[od]
 ;B[pc]
 ;W[qc]
 ;B[qj]
 ;W[nd]
 ;B[mc]
 ;W[nc]
 ;B[nb]
 ;W[ob]C[The two Black stones are captured. In the game, Black played elsewhere.]))
 (;W[pc]LB[od:B][pe:A]C['a' or 'b'.]
 (;B[pe]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mc])
 (;B[od]LB[ob:A][rf:B]TR[pe]C['a' is correct, 'b' eliminates the marked cut.]
 (;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc])
 (;W[rf]
 ;B[rg]
 ;W[re]
 ;B[pg]))))
 (;B[qg]LB[od:b][pe:a]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 White may respond at 'a' or 'b'. He must not permit Black 'a' by playing elsewhere.
+]
 (;W[pe]LB[md:c][og:b][qj:a]C[Black continues with 'a' or 'b', continuing to emphasize the right side. Black 'c' is playable, but shifts Black focus to the top.]
 (;B[qj]LB[kc:d][lc:c][pc:a][nd:e][of:b]C[White continues with 'a', 'b', 'c' or 'd'. White 'e' is not recommended.]
 (;W[pc]
 ;B[od]
 ;W[pb]
 ;B[kc]C[
 * Joseki *])
 (;W[of]
 ;B[lc]
 ;W[pc])
 (;W[lc]LB[qb:b][nd:a]C[Black continues with 'a'. Sliding into the corner with Black 'b' is premature.]
 (;B[nd]
 ;W[of]
 ;B[me]
 ;W[pc]
 ;B[kd]
 ;W[jc]C[
 * Joseki *])
 (;B[qb]C[The slide of Black 7 is premature.]
 ;W[nd]
 ;B[nc]
 ;W[md]
 ;B[rc]
 ;W[og]))
 (;W[kc]
 ;B[qb]
 ;W[nd]
 ;B[nc]
 ;W[md]
 ;B[rc]
 ;W[og])
 (;W[nd]LB[mc:b][nc:a]C[White 6 is not recommended. There is no point giving away territory in this way.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nc]
 ;W[ld]
 ;B[mc]
 ;W[ne]
 ;B[kc]
 ;W[pc]C[Grabbing the corner is small compensation.])
 (;B[mc]C[Black 7 is not recommended.]
 ;W[nc]
 ;B[nb]
 ;W[od]LB[ob:b][pc:a]C[Black 'a' (a sacrifice play) and 'b' are possible continuations.]
 (;B[pc]
 ;W[ob]
 ;B[mb]
 ;W[pb])
 (;B[ob]
 ;W[le]))))
 (;B[og]LB[pc:b][nd:a][ne:c]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[nd]
 ;B[nc]
 ;W[pc]
 ;B[od]
 ;W[oe]
 ;B[kc]C[
 * Joseki *])
 (;W[pc]
 ;B[ne]C[White leaves until later how to attack Black's thinness.])
 (;W[ne]C[White 6 is not recommended.]
 ;B[md]LB[pc:b][me:a]C[Black 7 is a very effective move.
 White 'a' and 'b' are both unpleasant to White.]
 (;W[me]C[White 8, prompting Black to crawl along the fourth line, is painful.]
 ;B[ld]
 ;W[pc]
 ;B[od]
 ;W[oe]
 ;B[mg]C[Black forces another push by White.]
 ;W[le]
 ;B[kd])
 (;W[pc]
 ;B[od]
 ;W[oe]
 ;B[me]
 ;W[ng]
 ;B[mf]
 ;W[nf]
 ;B[oh]C[White has poor shape.])))
 (;B[md]C[Black 5 is a bit inconsistent. In this case, Black 3 would be better placed one space higher (4th line).]
 ;W[pc]
 ;B[od]LB[pb:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[pb]
 ;B[ic])
 (;W[of]LB[kc:B][ph:A]C[White can continue on 'a' or 'b'.])))
 (;W[od]C[The idea of White 4 is to settle shape quickly. Professionals shy away from such play, because while fortifying oneself, they also strengthen the opponent, foreclosing later options.]
 ;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[qc]LB[qb:c][kc:a][qj:b]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[kc]LB[qf:a][pj:c][dp:b]C[White continues with 'a'. White cannot afford to play elsewhere ('b'). If self-preservation of the White corner stones is not top priority, White 'c' may be feasible.]
 (;W[qf]C[White 10 is necessary.]
 ;B[rf]
 ;W[re]
 ;B[pf]
 ;W[qe]C[
 * Joseki *])
 (;W[]LB[qb:b][rf:a]C[White plays elsewhere, a mistake. Black continues with 'a', or
 the more sneaky 'b'.]
 (;B[rf]
 ;W[qe]
 ;B[og]
 ;W[nf]
 ;B[md])
 (;B[qb]LB[rb:b][qf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qf]LB[rb:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[re]
 ;B[pf]
 ;W[qe]LB[rb:a][rg:b]C['a' and 'b' are miai. White lives.])
 (;B[rb]
 ;W[og]))
 (;W[rb]C[White has been tricked.]
 ;B[pd]
 ;W[pe]
 ;B[qe]LB[pb:a][qf:b]C[White continues with 'a' or 'b'.]
 (;W[pb]
 ;B[nc]C[White still has to settle himself into a small corner. White prospects are dim.])
 (;W[qf]
 ;B[re]))))
 (;W[pj]
 ;B[og]
 ;W[ph]
 ;B[pg]
 ;W[nf]LB[qb:b][ng:a]C[Black may try 'a' or 'b'.]
 (;B[ng]
 ;W[nc]C[The ensuing fight may take several directions.])
 (;B[qb]
 ;W[rb]
 ;B[pd]
 ;W[pe]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[me]C[White lives in the corner, and Black must find eye-shape for the Black stones on the right.])))
 (;B[qj]
 ;W[kc]
 ;B[ne]LB[og:b][pg:a]C[White continues with 'a'. White 'b' is wrong.]
 (;W[pg]LB[ph:b][qh:a]C[Black continues with 'a'. Black 'b' is not as good.]
 (;B[qh]
 ;W[og]
 ;B[le]
 ;W[id])
 (;B[ph]C[Black 13 is not recommended: the move is not bad, but the other variation is slightly better.]
 ;W[og]C[Since White is going to play 14 anyway, Black shouldn't help.]
 ;B[qf]
 ;W[qe]
 ;B[le]
 ;W[id]))
 (;W[og]C[White 12 is a mistake.]
 ;B[le]
 ;W[id]
 ;B[lb]CR[nc]LB[kb:b][rf:a]C[Black 15 defends against the marked cutting point.
 White continues with 'a'. White cannot afford to defend at top
 with 'b'.]
 (;W[rf]
 ;B[qf]
 ;W[qe]
 ;B[rg]C[Black 17 and 19 strengthen Black for which White has no compensation.])
 (;W[kb]C[White 16 is a mistake.]
 ;B[pd]
 ;W[pe]
 ;B[qe]
 ;W[qf]
 ;B[pf]LB[re:b][of:a]C['a' and 'b' are miai, a terrible result for White.])))
 (;B[qb]C[Black 9 is a mistake.]
 ;W[rb]
 ;B[pd]
 ;W[pe]
 ;B[qe]LB[pb:b][nc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[qf]LB[lc:a][re:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[lc]
 ;W[re]
 ;B[md]C[White has played elsewhere once, Black 3 is now useless: the
 result favors White.])
 (;B[re]C[Black 19 only makes Black's situation worse.]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[lc]
 ;W[rf]
 ;B[ne]
 ;W[pg]
 ;B[nf]
 ;W[ph]))
 (;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[mc]))))
 (;B[qh]LB[pc:a][od:c][pe:b][dp:d]C[
 -Space Low Pincer = Sangen Basami = Sekan Hyeopgong = San Jia
 ---------------------------------------------------------------
 Black 1 is mainly influenced by the position in the bottom right corner. It indicates a special strategy and is not seen often.
 In the local context it is a slack move.
 White continues with 'a' or 'b'.
 'c' is bad. tenuki 'd' is possible.
+]
 (;W[pc]
 ;B[od]LB[pe:b][qf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qf]
 ;B[og]C[
 * Joseki *])
 (;W[pe]C[White 6 is a mistake.]
 ;B[qf]LB[pb:b][qe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qe]
 ;B[kc])
 (;W[pb]
 ;B[ld]
 ;W[]C[White plays elsewhere.]
 ;B[rd]LB[rc:b][re:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]
 ;B[qe]
 ;W[rc]
 ;B[pd]
 ;W[sd])
 (;W[rc]C[White 11 is a mistake. White cannot make two eyes in the corner.]
 ;B[re]
 ;W[ob]
 ;B[nb]
 ;W[ra]
 ;B[sb]
 ;W[sc]
 ;B[oa]
 ;W[pa]
 ;B[pd]
 ;W[qe]
 ;B[qb]C[If White is sealed in the corner, such as with the extra Black stones as shown, White dies when Black plays 22.]
 ;W[rb]
 ;B[qc]
 ;W[qa]
 ;B[qc]))))
 (;W[pe]LB[kc:B][lc:A]C['a' is correct. 'b' is a mistake.]
 (;B[lc]
 ;W[pc]
 ;B[od]C[
 * Joseki *]
 ;B[qf]LB[pb:B][qe:A]C[Later, Black can continue here.
 'a' or 'b'.]
 (;W[qe])
 (;W[pb]
 ;B[rd]LB[rc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;W[rc]
 ;B[re])
 (;W[re]
 ;B[qe]
 ;W[rc]
 ;B[pd]
 ;W[sd])))
 (;B[kc]
 ;W[pg]
 ;B[ph]
 ;W[mc]))
 (;W[od]
 ;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[qc]LB[kc:A][ne:B]C['a' or 'b'.]
 (;B[kc])
 (;B[ne]
 ;W[nf]
 ;B[of]TR[qh]C[This answer is enabled by the triangled Black stone.
 If you know the follow-up, please email: kogo@waterfire.us.]))
 (;W[dp]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[pb]
 ;B[pc]
 ;W[qc]
 ;B[ob]))
 (;B[pg]LB[od:b][pe:a]C[
 -Space High Pincer = Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia
 -----------------------------------------------------------------------------
 The aim of Black 3 is to take advantage of White's response to play at the top.
 White 'a' is more common. White 'b' is the same as the one-space pincer variations.
+]
 (;W[pe]LB[md:a][oe:b]C[Black continues with 'a' or 'b'.]
 (;B[md]
 ;W[pc]
 ;B[od]LB[pb:a][jd:b]C[White continues with 'a'. A checking extension such as 'b' is not possible.]
 (;W[pb]
 ;B[ic]C[
 * Joseki *])
 (;W[jd]C[White 8 is a mistake.]
 ;B[pd]
 ;W[qc]
 ;B[qe]LB[re:B][qf:A]C['a' or 'b'.]
 (;W[qf]
 ;B[re]
 ;W[pf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[rd])
 (;W[re]
 ;B[qf])))
 (;B[oe]
 ;W[of]
 ;B[pf]
 ;W[od]
 ;B[ne]
 ;W[nd]
 ;B[me]LB[nc:a][md:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[nc]
 ;B[lc]
 ;W[lb]C[White 14 helps strengthen Black, but secures White's position
 in sente.]
 ;B[kb]
 ;W[mb]
 ;B[kd])
 (;W[md]C[White 12 is an overplay; White cannot make territory so easily.]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[jc]
 ;B[qc]
 ;W[rc]
 ;B[rb]C[The two-step hane is the tesuji.]
 ;W[pc]
 ;B[qb]LB[pb:a][rd:b]C[White 'b' looks obviously right, but is wrong. White must play 'a' and concede the corner.]
 (;W[pb]
 ;B[rd]
 ;W[re]
 ;B[sc])
 (;W[rd]C[White 22 is a mistake.]
 ;B[pb]
 ;W[pd]
 ;B[nb]LB[mb:A][sb:B]
 (;W[mb]
 ;B[sb])
 (;W[sb]C[White 26 is a mistake.]
 ;B[mb]
 ;W[lb]
 ;B[lc]LB[kc:b][mc:c][kd:a]C[White must play 'a'; 'b' and 'c' are unreasonable.]
 (;W[kd]
 ;B[kb])
 (;W[kc]C[White 30 is a mistake.]
 ;B[mc]
 ;W[kd]
 ;B[kb])
 (;W[mc]C[White 30 is a mistake.]
 ;B[kc]
 ;W[kd]
 ;B[kb]))))))
 (;W[od]LB[nd:a][pd:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nd]LB[oe:A][pf:B]C['a' is joseki, 'b' is questionable.]
 (;W[oe]
 ;B[pc]
 ;W[qc]
 ;B[qf]
 ;W[qe]LB[oc:1][pc:7][qc:10][nd:5][od:4][qd:2][oe:6][qe:8][qf:3][pg:9]C[
 * Joseki *
 See the variation referenced by the numbers for the continuations.])
 (;W[pf]LB[qf:A]C[If you know the follow-up, please email: kogo@waterfire.us.
 'a' reverts to an equal result.]
 ;B[qf]LB[oc:1][nd:5][od:4][qd:2][pf:6][qf:3][pg:7]C[See the variation referenced by the numbers for continuation.]))
 (;B[pd]C[Regardless of the ladder, Black 5 is a mistake.]
 ;W[pe]
 ;B[pc]
 ;W[re]
 ;B[oe]
 ;W[of]
 ;B[nd]
 ;W[pf]C[Black 3 has lost all power, which is not compensated for by Black's ponnuki.])))
 (;B[pf]LB[od:d][pe:c][qe:a][qf:b][dp:e]C[
 Large Slant = Taisha = Daesa = Da`xie´ = Grosse Schiefe Ebene
 --------------------------------------------------------------
 Black 3 initiates the taisha (large slant) joseki, regarded as one of the most complex joseki, and noted for its multitude of variations. For the complex variations (variation 'd'), Black must have the ladder.
 White may play at 'a', 'b' or 'c', or play elsewhere 'e', to avoid complications. These are compromise moves, so slight disadvantages cannot be avoided. There are compromise moves even after attaching at 'd'.
+]
 (;W[qe]LB[qc:b][oe:a][qf:c]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
 (;B[oe]
 ;W[qg]
 ;B[jc]LB[pg:B][ph:C][qh:A]C[
 * Joseki *
 Later, White plays 'a' or 'b' or Black 'c'.]
 (;W[qh])
 (;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[nh]
 ;B[mg])
 (;B[ph]LB[qh:B][rh:A]C['a' is correct. 'b' is a mistake.]
 (;W[rh]
 ;B[pg]
 ;W[qj])
 (;W[qh]
 ;B[pi]
 ;W[qi]
 ;B[pj])))
 (;B[qc]
 ;W[rc]
 ;B[pc]LB[rb:C][qf:B][qg:A]C['a' is correct, 'b' and 'c' are unfavorable attempts to cut Black.]
 (;W[qg]
 ;B[rb]
 ;W[pg])
 (;W[qf]
 ;B[ph]
 ;W[od]
 ;B[nd]
 ;W[oe]
 ;B[rb])
 (;W[rb]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[od]
 ;B[nd]
 ;W[oe]
 ;B[re]
 ;W[rd]
 ;B[sf]))
 (;B[qf]C[Black 5 is an overplay.]
 ;W[od]
 ;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[qc]C[Black 3 should be at P13, not P14.]))
 (;W[qf]LB[pe:a][pg:c][qg:b]C[Black continues with 'a' or 'b'.
 'c' is a mistake.]
 (;B[pe]LB[qe:a][qg:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qe]
 ;B[pg]
 ;W[qh]
 ;B[jc]C[
 * Joseki *])
 (;W[qg]LB[qc:A][qe:B]C[White 6 gives Black a favorable result.
 'a' makes a secure base in the corner in sente, 'b' aims for influence over the top side, giving the corner in gote.]
 (;B[qc]
 ;W[qe]
 ;B[pc]
 ;W[qj])
 (;B[qe]
 ;W[re]LB[qc:b][pd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pd]LB[qc:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[jc])
 (;W[qc]C[White 10 is a mistake.]
 ;B[rf]
 ;W[rd]
 ;B[qh]LB[pg:b][rg:a]C[White must suffer and play 'a'. White 'b' is a mistake.]
 (;W[rg]
 ;B[pg])
 (;W[pg]C[White 14 offers White a fight with little propsect of gain.]
 ;B[rg]
 ;W[ph]
 ;B[qi])))
 (;B[qc]
 ;W[pd]
 ;B[od]
 ;W[rd]))))
 (;B[qg]LB[pe:a][pg:b]C[White continues with 'a' or 'b'. White 'b' leads to complications.]
 (;W[pe]C[White 6 is a simple variation.]
 ;B[rf]
 ;W[qe]
 ;B[pg]
 ;W[nd]LB[mc:a][qk:b]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[pc]
 ;B[qk]C[
 * Joseki *])
 (;B[qk]C[Black 11 is recommended if White is likely to pincer on the right.]
 ;W[nc]C[There is still aji in Black 1.]))
 (;W[pg]C[White 6 introduces complications. The ladder is important.]
 ;B[qe]
 ;W[rf]LB[pe:b][of:a]C[Black continues with 'a' or 'b'.]
 (;B[of]LB[re:a][qh:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]
 ;B[ph]
 ;W[pc]
 ;B[nd])
 (;W[qh]C[White 10 is a mistake.]
 ;B[re]
 ;W[rg]
 ;B[pd]C[Black's corner profit is substantial.]))
 (;B[pe]C[Black 9 is sensible with an unfavorable ladder.]
 ;W[re]
 ;B[qh]
 ;W[og]
 ;B[ne]
 ;W[qc]
 ;B[pj])))
 (;B[pg]
 ;W[od]
 ;B[pc]
 ;W[pd]
 ;B[qc]
 ;W[nc]))
 (;W[pe]LB[oe:a][of:b]C[White continues with 'a', or possibly the unorthodox 'b'.]
 (;B[oe]LB[od:b][qf:a]C[White continues with 'a' or 'b'.]
 (;W[qf]LB[pd:b][of:c][pg:a]C['a', 'b' and 'c' is joseki. 'a' is the most difficult, 'c' the easiest of the three.]
 (;B[pg]
 ;W[qg]
 ;B[ph]LB[qh:a][qi:b]C[White continues with 'a'. White 'b' is premature.]
 (;W[qh]
 ;B[pi]
 ;W[qj]LB[ic:a][qc:b]C[Black can play at 'a' or first force at 'b'.]
 (;B[ic]LB[od:a][dp:b]C[
 * Joseki *
 White 'a' makes Black thick, but playing elsewhere ('b') is also
 costly.]
 (;W[od]C[White 14 is after the joseki. The corner is at stake, but playing this early makes Black thick.]
 ;B[nd]
 ;W[pd]LB[nc:b][ne:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ne]
 ;W[nc]LB[ob:A][mc:B]C['a' or 'b'.]
 (;B[ob]
 ;W[nb]
 ;B[qb]
 ;W[qc])
 (;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ob]))
 (;B[nc]C[Black 17 is a mistake.]
 ;W[ne]
 ;B[of]
 ;W[me]
 ;B[lc]C[Black is low.]
 ;W[mg]C[Black's center stones will have to make life in the center, giving White opportunity for profit as well as ruining Black's thickness.]))
 (;W[]C[White plays elsewhere.]
 ;B[pd]
 ;W[qe]
 ;B[qc]
 ;W[rc]
 ;B[qb]))
 (;B[qc]LB[jc:c][rc:a][dp:b]C[White will normally answer at 'a' or 'c'. In a 1985 Meijin game against Kobayashi, Cho with Black didn't answer, and 'b' shows
 what happened.]
 (;W[rc]
 ;B[ic]LB[od:a]C[The exchange of the marked stones aims at dissuading White of wedging at 'a'. The continuation shows why.]
 ;W[od]
 ;B[nd]
 ;W[pd]
 ;B[pc]
 ;W[rb]
 ;B[mc]
 ;W[ne]
 ;B[of]
 ;W[me]
 ;B[kd]C[All of Black's stones are working together efficiently.])
 (;W[]
 ;B[pd]
 ;W[qe]
 ;B[qi]
 ;W[ri]
 ;B[pj]
 ;W[qk]
 ;B[rj]
 ;W[rk]
 ;B[rd]
 ;W[re]
 ;B[rc]
 ;W[rh])
 (;W[jc]
 ;B[pd]
 ;W[qe]
 ;B[rd]
 ;W[qi]
 ;B[hc])))
 (;W[qi]C[White 10 is a mistake.]
 ;B[pd]
 ;W[qe]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]LB[sb:b][rd:a]C[White continues with 'a'. White 'b' is unreasonble.]
 (;W[rd]LB[qh:a]C[White must defend with 18 because of the potential thrust at 'a'.]
 ;B[ic])
 (;W[sb]C[White 18 is a mistake.]
 ;B[qh]
 ;W[rh]
 ;B[ri]LB[rg:a][rj:b]C[White must play 'a'. White 'b' is a mistake.]
 (;W[rg]C[White 22 is necessary.]
 ;B[qj]C[Black cuts off the White stone.])
 (;W[rj]C[White 22 is a mistake.]
 ;B[rg]
 ;W[si]
 ;B[rd]
 ;W[rf]
 ;B[sc]))))
 (;B[pd]
 ;W[qe]
 ;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[pg]
 ;B[of]
 ;W[qj]C[
 * Joseki *])
 (;B[of]
 ;W[qg]C[
 * Joseki *]))
 (;W[od]C[The hanekomi of White 6 was invented by Kitani Minoru.]
 ;B[nd]
 ;W[pd]LB[nc:c][ne:a][of:b]C[Black continues with 'a' to 'c'.]
 (;B[ne]LB[nc:a][qf:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[nc]LB[ob:b][mc:a]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[nb]LB[mb:a][ld:b][qf:c]C[Black continues with 'a', 'b' or 'c'.]
 (;B[mb]
 ;W[ob]
 ;B[og])
 (;B[ld]
 ;W[ob]
 ;B[qf]C[
 * Joseki *])
 (;B[qf]
 ;W[mb]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[]C[White plays elsewhere.]
 ;B[qb]
 ;W[pb]C[White 19...]
 ;B[rd]C[... allows Black 20.]))
 (;B[ob]LB[nb:a][mc:b]C[Black 11 is a relatively recent innovation. White continues with 'a'. White 'b' is a mistake.]
 (;W[nb]LB[qb:b][lc:a]C[The joseki continues at 'a', but it is important to know how to answer Black 'b'.]
 (;B[lc]LB[lb:b][pb:a]C[White continues with 'a'. White 'b' is pointless.]
 (;W[pb]
 ;B[mc]
 ;W[pc]LB[og:A]
 (;B[og]C[
 * Joseki *])
 (;B[]C[Black plays elsewhere.]
 ;W[pg]LB[qf:a][og:b]C[Black fights back with 'a', or plays solidly with 'b'.]
 (;B[qf]C[Black 19 provokes a fight.]
 ;W[of]
 ;B[qg]
 ;W[og]
 ;B[qi]
 ;W[oi]LB[le:a][pk:b]C[Black continues with 'a' or 'b'.]
 (;B[le]C[Black 24 is honte (the correct defense).]
 ;W[qj]
 ;B[rj]
 ;W[pi]
 ;B[rh]
 ;W[qk]
 ;B[rk]
 ;W[ql])
 (;B[pk]
 ;W[mf]
 ;B[le]))
 (;B[og]
 ;W[qf]
 ;B[oh])))
 (;W[lb]C[White 14 is fruitless.]
 ;B[mc]
 ;W[mb]
 ;B[kc]
 ;W[pb]))
 (;B[qb]
 ;W[qc]LB[pb:b][lc:a]C[Black continues with 'a'. White cannot live in the corner with 'b'.]
 (;B[lc]LB[lb:b][pb:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[mc]
 ;W[oa]
 ;B[og])
 (;W[lb]C[White 16 is a mistake.]
 ;B[oa]LB[rb:b][kc:a]C[Black 17 is the tesuji.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[kc]
 ;B[ld]
 ;W[mc]
 ;B[rb]C[White faces a tough fight.])
 (;W[rb]C[White 18 is a mistake.]
 ;B[mb]
 ;W[mc]
 ;B[md]
 ;W[ma]
 ;B[na]
 ;W[mb]
 ;B[kb])))
 (;B[pb]C[Black cannot live in the corner.]
 ;W[lc]
 ;B[rc]
 ;W[rd]
 ;B[sc]
 ;W[qf]LB[pg:b][qg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qg]
 ;W[pg]
 ;B[of]
 ;W[rg]
 ;B[qh]
 ;W[re])
 (;B[pg]C[Black 23 is a mistake.]
 ;W[qg]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[og]
 ;W[nf]))))
 (;W[mc]C[White 12 is a mistake.]
 ;B[rc]LB[qc:b][qf:a]C[Black 13 is the tesuji. White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[sb]
 ;W[pb]
 ;B[ra]
 ;W[pa]
 ;B[rd]
 ;W[qe]
 ;B[ld])
 (;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[sb]
 ;W[pb]
 ;B[ra]
 ;W[pa]
 ;B[rd]
 ;W[nb]
 ;B[qf]))))
 (;W[qf]C[White 10 is not recommended, as it gives Black superior thickness.]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[qh]))
 (;B[of]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[md]
 ;W[ob])
 (;B[nc]LB[of:a][qf:b]C[Whit continues with 'a'. White 'b' is not recommended.]
 (;W[of]
 ;B[ne]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[rc]LB[rd:a][re:b]C[White continues with 'a'. White 'b' is less favorable.]
 (;W[rd]
 ;B[qc]LB[nf:b][og:a]C[
 * Joseki *
 Black can aim at the cutting point at 'a'. The atari at 'b' and connection of 'a' is less promising.]
 ;W[]C[White plays elsewhere.]
 ;B[og]
 ;W[nf]
 ;B[mf]
 ;W[ng]
 ;B[oh]
 ;W[mg]
 ;B[lf]C[Black 26 is the move Black wants to be forced into making: crawling
 on the sixth line.])
 (;W[re]C[White 18 is not recommended.]
 ;B[nf]
 ;W[og]
 ;B[rd]
 ;W[sf]))
 (;W[qf]C[White 10 is too mild.]
 ;B[of]
 ;W[qh]
 ;B[ic]))))
 (;B[of]LB[nd:a][oe:b]C[Black 5 was invented by Hashimoto Utaro in 1964 (played in the 19th Honinbo League agasint Kitani Minoru).
 White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[od]
 ;B[pc]
 ;W[qf]
 ;B[qg]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ph])
 (;W[oe]
 ;B[nf]
 ;W[qf]
 ;B[qg]
 ;W[ne]
 ;B[rf]
 ;W[qe]
 ;B[lc]
 ;W[mf]
 ;B[ph]
 ;W[jc])))
 (;W[od]LB[nd:B][pd:A]C['a' is joseki, If Black regrets what he has done so far and fears the consequence of the many variations of the taisha after 'a', he compromises on 'b'.]
 (;B[pd]LB[pc:B][pe:A]C['a' is correct. 'b' is a mistake.
+]
 (;W[pe]
 ;B[pc]LB[oe:a][qe:b]C[White continues with 'a' or 'b'.
 White 'a' has only one joseki continuation, but requires a favorable ladder.
 White 'b' gives White the choice between some easy and the '1000
 variations'.]
 (;W[oe]C[White 8 requires a favorable ladder.]
 ;B[qe]
 ;W[qf]
 ;B[re]LB[pg:A][qg:B]C['a' is joseki, 'b' is inferior.]
 (;W[pg]LB[mc:a][rf:b][dp:c]C[Black 'a' is joseki. Black 'b' leads to a slightly unfavorable position for Black. Black should not play elsewhere ('c').]
 (;B[mc]
 ;W[of]
 ;B[rd])
 (;B[rf]C[Black 13 is not recommended.]
 ;W[of]LB[rg:a][qh:b]C[Black 'a' is best. Black 'b' is riskier.]
 (;B[rg]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]C[White's thickness is better: Black has territory, but his position is too low.])
 (;B[qh]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[mc]
 ;W[nd]LB[lb:b][ob:a]C[Black continues with 'a'. Black 'b' involves a dangerous ko for Black.]
 (;B[ob]
 ;W[lc]LB[rg:a]C[White 'a' remains as bad aji in Black's position.])
 (;B[lb]
 ;W[rd]LB[ma:b][ob:a]C[Black continues with 'a'. Black 'b' only makes the ko worse for Black.]
 (;B[ob]
 ;W[rg]
 ;B[qg]
 ;W[se]
 ;B[pf]
 ;W[md]LB[lc:b][qf:a]C[Black connects the ko at 'a'. If]
 ;B[qf]
 ;W[lc]
 ;B[rc]C[Black has no choice but to connect the ko at 29. If he defends against 28, White will take the ko and ignore any ko threat.
 White has sente, making this a good result for him.])
 (;B[ma]C[Black 23 is a mistake.]
 ;W[rg]
 ;B[qg]
 ;W[se]
 ;B[pf]
 ;W[pb]TR[oc][pc][pd][qe][re][rf]C[Black will probably lose one of the marked groups.]))))
 (;B[]C[Black plays elsewhere; not recommended.]
 ;W[of]
 ;B[rd]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[mc]
 ;W[nd]
 ;B[ob]
 ;W[lc]))
 (;W[qg]
 ;B[rd]
 ;W[og]
 ;B[md]))
 (;W[qe]
 ;B[oe]LB[nd:b][of:a]C[White continues with 'a' or 'b'.
 White 'b' leads to the difficult and manyfold variations of the taisha. Learn these after you learned any other joseki you find here.]
 (;W[of]LB[nd:a][ne:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[ne:a][pg:b]C[White fights ko with 'a'. White 'b' to avoid ko is unthinkable.]
 (;W[ne]LB[md:b][od:d][me:a][nf:c]C[Black continues with 'a' or 'b'. Black 'c' is bold, as it requires
 Black having large ko threats. Black 'd' is a mistake.]
 (;B[me]
 ;W[od]
 ;B[qc]
 ;W[oe]
 ;B[md]LB[qi:B][qj:A][dp:C]C[White continues locally with 'a' or 'b'. White may play elsewhere,
 but this is not recommended.]
 (;W[qj])
 (;W[qi]LB[mf:B][mg:A]C[
 * Joseki *
 From the standpoint of tewari, this result is slightly favorable
 to Black.
 Continuations Black 'a' or White 'b'.]
 (;B[mg]C[Later, this is gote.]
 ;B[og]
 ;W[qg])
 (;W[mf]
 ;B[lf]
 ;W[mh]
 ;B[mg]
 ;W[ng]
 ;B[lg]
 ;W[lh]
 ;B[kh]
 ;W[ki]))
 (;W[]C[White plays elsewhere, not recommended.]
 ;B[ph]
 ;W[oh]
 ;B[oi]
 ;W[nh]
 ;B[pj]C[White's position has eroded considerably.]))
 (;B[md]
 ;W[od]
 ;B[qc]
 ;W[pg])
 (;B[nf]C[Black must have some very large ko threats to play this way.]
 ;W[od])
 (;B[od]C[Black 13 is a mistake.]
 ;W[qc]
 ;B[nf]
 ;W[og]
 ;B[me]
 ;W[pg]C[Despite the ponnuki, the result favors White.]))
 (;W[pg]C[White 12 is cowardice.]
 ;B[nf]
 ;W[og]
 ;B[ng]
 ;W[oi]
 ;B[nh]
 ;W[pi]))
 (;B[ne]
 ;W[pg]
 ;B[nf]
 ;W[og]LB[ng:A]C[
 * Joseki *
 A is now a big continuation for both sides.]))
 (;W[nd]LB[qc:A][qf:B]C[White 10 leads to the difficult variations.
 Black must have the ladders.
 'a' is correct.
 'b' is a mistake.]
 (;B[qc]LB[nc:b][qf:a]C[Black 11 is the only move.
 White 'a' is the only continuation. White 'b' is close to being
 a trick play, although it is a hard one to deal with. White needs
 the ladder for 'b'.]
 (;W[qf]LB[ld:d][ne:c][of:a][pg:b]C[White 12 is the only continuation.
 Black continues with 'a', 'b' or 'c'.
 Black 'd' is a trick play.]
 (;B[of]LB[nc:b][qh:a]C[Joseki continues with White 'a'. White 'b' is a trick play
 that requires careful answering.]
 (;W[qh]LB[mb:a][mc:b][ld:c][md:d][le:f][me:e]C[Black has six possible continuations: 'a' through 'e '. 'f'.
 f6, e5, d4, c3, b2, a1]
 (;B[mb]LB[ld:a][pg:b]C[White continues with 'a'. White 'b' may be playable if caring for the two White center stones is a burden.]
 (;W[ld]LB[mh:b][nh:c][oh:a]C[Black continues with 'a' to 'c'.]
 (;B[oh]LB[jd:b][lg:c][pj:a]C[White continue with 'a' to 'c'.]
 (;W[pj]
 ;B[lg]LB[kg:a]C[Black 19 at 'a' is also possible.]
 ;W[jd]C[
 * Joseki *])
 (;W[jd]
 ;B[qi]
 ;W[ri]
 ;B[ph]
 ;W[rg]
 ;B[qj]
 ;W[rj]
 ;B[qk])
 (;W[lg]
 ;B[qi]
 ;W[ri]
 ;B[ph]
 ;W[rg]
 ;B[qj]))
 (;B[mh]LB[ng:B][pg:A]C['a' is correct. 'b' is a mistake.]
 (;W[pg]
 ;B[mf]
 ;W[jd]
 ;B[pi]
 ;W[rj]
 ;B[og])
 (;W[ng]
 ;B[ph]
 ;W[nh]
 ;B[qi]
 ;W[qg]
 ;B[oh]
 ;W[ri]
 ;B[ni]
 ;W[qj]
 ;B[mg]))
 (;B[nh]LB[jd:b][pj:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pj]LB[kg:B][lg:A]C['a' or 'b'.]
 (;B[lg]
 ;W[jd]C[
 * Joseki *])
 (;B[kg]
 ;W[jd]))
 (;W[jd]C[White 18 is not recommended.]
 ;B[pj]
 ;W[rj]
 ;B[ph]
 ;W[qi]
 ;B[nk])))
 (;W[pg]C[White 16 is not recommended, but perhaps reasonable if caring
 for the two White center stones is a burden.]
 ;B[me]LB[md:a]C[Black later playing at 'a' to seal the White stones is a good idea.
 White cannot pull the two stones out, as the continuations show.]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[kd]LB[lb:a][ne:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[lb]
 ;B[lc]
 ;W[mc]
 ;B[kc]
 ;W[nb]
 ;B[ma]LB[na:b][nc:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[nc]
 ;B[ob]
 ;W[na]
 ;B[kb])
 (;W[na]
 ;B[nc]
 ;W[la]
 ;B[mb]
 ;W[ma]
 ;B[ne]
 ;W[mb]
 ;B[ob]))
 (;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[ng]
 ;W[mg]
 ;B[nh]
 ;W[mh]
 ;B[mi]
 ;W[li]
 ;B[ke]
 ;W[ni]
 ;B[oi]
 ;W[mj]
 ;B[oh]
 ;W[oj]
 ;B[pi])))
 (;B[mc]
 ;W[md]LB[lc:b][ld:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[ld]LB[nc:a][le:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[lc]
 ;W[ob]LB[na:a][me:b]C[Black must sacrifice another stone by playing 'a'. Black 'b'
 results in a ko unfavorable to Black.]
 (;B[na]LB[ma:b][me:a]C[White must play 'a'. White 'b' is a mistake.]
 (;W[me]LB[lb:a][pb:b]C[Black continues with 'a' or 'b'. If White plays properly, he may secure a favorable result.]
 (;B[lb]
 ;W[rc]
 ;B[pb]LB[qb:A][mg:B]C['a' or 'b',]
 (;W[qb]
 ;B[pa]
 ;W[le])
 (;W[mg]
 ;B[oh]
 ;W[mi]
 ;B[oj]
 ;W[rb]C[White 32 is big. This result favors White.]))
 (;B[pb]
 ;W[le]
 ;B[ke]
 ;W[kf]
 ;B[je]
 ;W[lg]LB[oh:a][pj:b]C[Black gets a good position at the top, but his three center stones
 are forfeit: Black 'a' prompts White 'b'.]))
 (;W[ma]
 ;B[me]
 ;W[oa]
 ;B[nb]
 ;W[na]
 ;B[ne]
 ;W[nb]LB[lb:A][rb:B]C['a' or 'b'.]
 (;B[lb]
 ;W[rc]
 ;B[qb]LB[qa:b][rb:a]C[White plays 'a' and is captured outright. White plays 'b' and gets an unfavorable ko.]
 (;W[rb]LB[pa:a][ra:b]C[Black can play 'a' or 'b' to capture.])
 (;W[qa]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[ra]
 ;B[sc]
 ;W[pb]
 ;B[sa]))
 (;B[rb])))
 (;B[me]
 ;W[na]
 ;B[ne]
 ;W[nb]LB[pb:A][rc:B]C['a' is correct. 'b' is a mistake.]
 (;B[pb]
 ;W[rc]
 ;B[rb]
 ;W[pa]
 ;B[qb]
 ;W[rd]
 ;B[sb]
 ;W[lb]
 ;B[kb]
 ;W[ra]
 ;B[qa]
 ;W[kc]
 ;B[jb]
 ;W[sc]
 ;B[oa]LB[le:a]C[A ko fight, but unfavorable to Black, as White has ko threats, beginning with 'a'.])
 (;B[rc]
 ;W[pb]
 ;B[qb]
 ;W[lb]
 ;B[kb]
 ;W[ra])))
 (;W[le]C[White 18 is a mistake.]
 ;B[nc]
 ;W[kd]
 ;B[lc]
 ;W[me]
 ;B[ke]))
 (;B[lc]C[Black 17 is too mild.]
 ;W[ld]
 ;B[kd]
 ;W[ke]
 ;B[jd]
 ;W[lf]
 ;B[oh]
 ;W[pj]C[White has a very favorable center position for the fight ahead; adequate compensation for Black's situation at top.]
 ;B[mg]C[Black looks more solid at top than he really is. The continuation demonstrates.]
 ;W[nc]
 ;B[nb]
 ;W[ob]LB[mb:a][pb:b]C[Now Black faces an uncomfortable choice: 'a' or 'b'.]
 (;B[mb]
 ;W[rc])
 (;B[pb]
 ;W[mb]
 ;B[oa]
 ;W[kc]
 ;B[lb]
 ;W[kb]C[White successfully separates the Black stones.])))
 (;B[ld]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[mc]LB[ob:A][me:B]C['a' is correct. 'b' is a mistake.]
 (;W[ob]
 ;B[na]LB[ma:B][me:A]C['a' is correct. 'b' is a mistake.]
 (;W[me]LB[lb:b][pb:a][le:c]C[Black continues with 'a' or 'b'. 'c' is inferior.]
 (;B[pb]
 ;W[le]
 ;B[kd]
 ;W[ke]
 ;B[jd]LB[je:a]C[The result favors White. 'a' is sente.]
 ;W[oh])
 (;B[lb]
 ;W[rc]
 ;B[pb]
 ;W[le]C[With Black's three center stones weak, this also favors White.]
 ;W[rb]C[Later, this is sente.]
 ;W[pa]
 ;B[oa]
 ;W[qa])
 (;B[le]
 ;W[mf]
 ;B[lb]
 ;W[rc]
 ;B[pb]
 ;W[lf]))
 (;W[ma]
 ;B[ne]
 ;W[oa]
 ;B[nb]
 ;W[na]
 ;B[md]
 ;W[nb]
 ;B[lb]
 ;W[rc]
 ;B[qb]))
 (;W[me]
 ;B[lb]
 ;W[rc]
 ;B[pb]))
 (;B[md]C[Black 15 is a trick play.]
 ;W[nc]LB[mc:a][ne:b]C[White 16 is the only move.
 Black continues with 'a' or 'b'.]
 (;B[mc]LB[nb:b][ne:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ne]
 ;B[nb]
 ;W[me]LB[le:c][oh:a][ph:b]C[Black continues with 'a'. Black 'b' can lead to ko. Black 'c' is not recommended.]
 (;B[oh]
 ;W[ke]LB[lb:a][qi:b]C[Black continues with 'a'.
 Black 'b' starts a fight that is tougher on Black than White.]
 (;B[lb]
 ;W[pj]C[White has a satisfactory result.])
 (;B[qi]C[Black 23 is not recommended.]
 ;W[rc]LB[lb:a][rb:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[lb]
 ;W[qb]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[ph]
 ;B[pi]
 ;W[oi])
 (;B[rb]C[Black 25 is not recommended.]
 ;W[ri]
 ;B[ph]
 ;W[rg]
 ;B[qj]
 ;W[rj]
 ;B[qk]
 ;W[mb]
 ;B[ob]
 ;W[lc]LB[rd:a]C[White 'a' is also sente.])))
 (;B[ph]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[qg]
 ;W[pi]LB[pg:a][rg:b]C[Black continues by filling the ko at 'a'.
 Black 'b' is a mistake.]
 (;B[pg]C[There is nothing that White can do to salvage the situation.])
 (;B[rg]C[Black 27 is a mistake.]
 ;W[pg]
 ;B[rf]LB[rd:b][ph:a]C[White may try 'a' or 'b'.]
 (;W[ph])
 (;W[rd]
 ;B[ph])))
 (;B[le]C[Black 21 is not recommended.]
 ;W[ng]LB[nf:a][ph:b]C[Black continues with 'a'. Black 'b' leads to a game-deciding ko.]
 (;B[nf]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[nh]
 ;W[ke]C[White also has the squeeze play at the marked stone.]MA[pg])
 (;B[ph]C[Black 23 is a game-ending mistake involving a ko for which no threat is large enough.]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[qg]
 ;W[pi]LB[rg:a]C[If Black continues with 'a', White takes the ko; there is no threat big enough to stop White from capturing. The game is over.])))
 (;W[nb]
 ;B[ne]
 ;W[mb]
 ;B[lb]
 ;W[ob]
 ;B[pb]
 ;W[rc]
 ;B[pa]LB[qa:a][qb:b]C[The White stones are captured.
 White may try 'a' or 'b'. Neither work.]
 (;W[qa]
 ;B[rb])
 (;W[qb]C[White 26 goes for ko.]
 ;B[rb]
 ;W[ra]
 ;B[ma])))
 (;B[ne]
 ;W[mc]LB[lc:a][ld:b]C[Black continues with 'a' or 'b'.]
 (;B[lc]
 ;W[lb]
 ;B[ld]
 ;W[ob]
 ;B[pb]LB[kb:a][nb:b]C[White continues with 'a' or 'b'.]
 (;W[kb]
 ;B[nb]
 ;W[mb]
 ;B[oa]
 ;W[jd])
 (;W[nb]
 ;B[kb]
 ;W[rc]
 ;B[pa]
 ;W[qa]
 ;B[rb]
 ;W[oa]
 ;B[qb]
 ;W[sb]
 ;B[ra]
 ;W[ma]
 ;B[rd]C[White can later aim at a ko at the marked location, but not immediately (with the stones as is).]MA[sd]
 ;W[]C[White plays elsewhere.]
 ;B[qg]
 ;W[rg]
 ;B[pg]
 ;W[rf]
 ;B[sc]C[White is still low, so the thrust of Black 36 was successful.]))
 (;B[ld]
 ;W[ob]
 ;B[pb]LB[kb:A][nb:B]C['a' or 'b'.]
 (;W[kb]
 ;B[kc]
 ;W[nb]LB[lb:b][rb:a]C[White 24 is sente, as Black must make eyes in the corner by playing 'a'.
 White 'b' is a mistake.]
 (;B[rb]
 ;W[jc])
 (;B[lb]C[Black 25, preventing White from escaping, seals the fate of the Black corner stones: Black loses the race to capture.]
 ;W[rc]
 ;B[rb]
 ;W[pa]
 ;B[qb]
 ;W[sc]C[Black loses the race to capture.]))
 (;W[nb]LB[rb:A][lc:B]C['a' or 'b'.]
 (;B[rb]
 ;W[kc])
 (;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[rc]LB[pa:B][rb:A]C['a' is correct, 'b' is inferior.]
 (;B[rb]
 ;W[pa]
 ;B[qb]
 ;W[rd]
 ;B[sb]
 ;W[ma]
 ;B[oa])
 (;B[pa]
 ;W[qa]
 ;B[rb]
 ;W[oa]
 ;B[qb]
 ;W[sb]
 ;B[ra]
 ;W[ma]
 ;B[rd]
 ;W[pg]
 ;B[mf]LB[sd:A]C[White is secure, but against Black there is still the ko on 'a'.]))))))
 (;B[me]LB[nc:a][md:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[lc]LB[ob:a][rc:b]C[White continues at 'a' or 'b'. White 'a' starts a fight. White 'b' gives up the three White stones.]
 (;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[rb]
 ;W[rd]
 ;B[qa]
 ;W[lb]LB[kb:b][kc:a]C[Black continues with 'a'. Black 'b' is unreasonable, but White must counter well or lose the game.]
 (;B[kc]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[ib]
 ;B[mg]LB[qj:A][qk:B]C['a' or 'b'.]
 (;W[qj]C[
 * Joseki *])
 (;W[qk]
 ;B[gc]))
 (;B[kb]LB[kc:C][ld:B][ne:A]C['a' is correct, 'b' leaves possibilities for Black, 'c' fails.]
 (;W[ne]
 ;B[nf]
 ;W[ld]
 ;B[md]
 ;W[mc]
 ;B[kc]
 ;W[mf]
 ;B[le]
 ;W[ng])
 (;W[ld]LB[md:C][le:A][ph:B]C[Black may try 'a' or 'b'. 'c' is a mistake.]
 (;B[le]LB[kc:a][kd:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[md]
 ;W[mc]LB[jb:a][ic:b]C[Black cannot win the ko. If Black 'a', White 'b' is a ko threat
 in itself.])
 (;W[kd]C[White 28 is a mistake. White loses.]
 ;B[md]
 ;W[kc]
 ;B[mc]
 ;W[mb]
 ;B[jb]))
 (;B[ph]LB[kc:b][qi:a]C[White continues with 'a', giving up the White stones at top (and 30 points of territory) for thickness.
 White 'b' saves the top stones, but the stones at right are hemmed in (in White gote). This variation is not recommended for White.]
 (;W[qi]
 ;B[md]
 ;W[ne]
 ;B[nf]
 ;W[kc]
 ;B[mc]
 ;W[mb]
 ;B[jb]
 ;W[mf]
 ;B[le]
 ;W[lf]
 ;B[ke]
 ;W[ng]
 ;B[oh]
 ;W[ni]
 ;B[pg]
 ;W[kf]
 ;B[je]
 ;W[jf]
 ;B[ie]
 ;W[nh]
 ;B[oa]
 ;W[oi]
 ;B[la]C[White's thickness compensates for the 30 point loss of territory.])
 (;W[kc]C[White 28 is not recommended.]
 ;B[qi]
 ;W[rh]
 ;B[ri]
 ;W[si]
 ;B[pi]
 ;W[sc]
 ;B[sb]
 ;W[se]))
 (;B[md]
 ;W[mc]
 ;B[kc]
 ;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[le]
 ;W[ng]LB[lf:a]C[Note that White plays 34, not at 'a'.]))
 (;W[kc]C[White 26 is a mistake.]
 ;B[ph]C[Black 27 initiates an exchange that favors Black.]
 ;W[qi]
 ;B[kd]
 ;W[jc]
 ;B[mb]
 ;W[ld]
 ;B[la]LB[md:b][le:a]C[White may try 'a' or 'b'.]
 (;W[le]
 ;B[md]
 ;W[mc]
 ;B[ne]
 ;W[lb]
 ;B[qg]C[The problem is that White has no ko threats...]
 ;W[lc]C[... so must connect...]
 ;B[rg]C[... giving Black considerable profit.])
 (;W[md]
 ;B[jd]LB[jb:c][ic:b][le:a]C['a' and 'b' are miai.
 White 'c' is a mistake.]
 (;W[le]
 ;B[ic])
 (;W[jb]C[White 36 is a mistake.]
 ;B[le]C[Black creates a ko situation.]
 ;W[mc]
 ;B[id]C[Extending with 39, waiting to play the ko, is good enough for Black.])))))
 (;W[rc]LB[nb:a][rb:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[nb]
 ;W[qb]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[rb]LB[mc:B][ne:A]C['a' or 'b'.]
 (;B[ne])
 (;B[mc]))
 (;B[rb]C[Black 19 is an overplay.]
 ;W[ob]
 ;B[pb]
 ;W[pa]
 ;B[qb]
 ;W[mb]
 ;B[rd]
 ;W[kc]
 ;W[ra]C[Later, White can make a picnic-ko.]
 ;B[sc]
 ;W[qa]
 ;B[re]
 ;W[rf]
 ;B[se]
 ;W[sb])))
 (;W[md]C[White 16 is a mistake.]
 ;B[le]
 ;W[nb]
 ;B[ob]LB[kc:a][ld:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[kc]LB[id:A][jd:B]C['a' or 'b'.]
 (;B[id]C[Black 21 is a good large-scale pressing move.]
 ;W[jc]
 ;B[je]
 ;W[hc]LB[oi:b][qj:a]C[Black continues with 'a' or 'b'.]
 (;B[qj]C[Black 25 provokes Black to the center.])
 (;B[oi]C[Black plays this way when the right side is uninteresting.]
 ;W[pj]
 ;B[nk]))
 (;B[jd]))
 (;W[ld]C[Black 20 is bad, as it only makes these stones heavier.]
 ;B[kd]
 ;W[kc]LB[jc:b][jd:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[jd]
 ;W[jc]
 ;B[id])
 (;B[jc]C[Black 23 is an overplay, even if the ladder to the lower left
 favors Black.]
 ;W[ke]
 ;B[jd]
 ;W[ne]
 ;B[nf]
 ;W[mf]
 ;B[lf]
 ;W[mg]C[Black has lost if the ladder is unfavorable. Even with a favorable
 ladder, this is not a favorable situation for Black.]))))
 (;B[le]
 ;W[nc]
 ;B[lc]
 ;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[rb]
 ;W[rd]
 ;B[qa]LB[kd:b][ld:a][me:c]C[White continues with 'a' if the ladder is favorable. White may also play 'b' or 'c' regardless of the ladder.]
 (;W[ld]LB[kd:a][md:b]C[White 24 is a tesuji.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[kd]
 ;W[md]LB[me:b][mf:a]C[Black continues with 'a' if the ladder is unfavorable.
 If the ladder is unfavorable for White, White has made a serious
 mistake, and Black continues with 'b'.]
 (;B[mf]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jd]
 ;W[lb]LB[jb:a][ke:b]C[White has a slightly favorable position, as Black 'a' is not sente, and the cutting point of 'b' is disfavorable aji.])
 (;B[me]C[Black plays 27 if the ladder to the lower left is unfavorable to White.]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[mb]LB[jb:A][ne:B]C['a' or, with the ladder, 'b'.]
 (;W[jb]
 ;B[ne]LB[ka:b][ma:a]C[Black 'a' is the best Black can do: a flower-viewing ko for White.
 Black 'b' results directly in a loss through a snapback.]
 (;W[ma]
 ;B[na]
 ;W[oa]
 ;B[la]
 ;W[mc]
 ;B[na]C[The marked location remains a ko threat for Black if needed.]MA[qg])
 (;W[ka]
 ;B[na]LB[oa:a][lb:b]C[White may try 'a' or 'b'; neither work.]
 (;W[oa]
 ;B[ma]
 ;W[lb]
 ;B[pa]
 ;W[mc]
 ;B[lc])
 (;W[lb]
 ;B[oa]
 ;W[mc]
 ;B[lc])))
 (;W[ne]C[White may play 32 with a favorable ladder.]
 ;B[nf]
 ;W[ke]
 ;B[jd]
 ;W[kf]
 ;B[lf]LB[id:A]C[Ladder on 'a'.])))
 (;B[md]C[Black 25 is a mistake.]
 ;W[ne]
 ;B[kd]
 ;W[ng]C[White captures the three Black stones]
 ;B[ph]
 ;W[oh]
 ;B[pg]
 ;W[pi]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qi]
 ;B[rf]
 ;W[sg]
 ;B[sf]
 ;W[ri]
 ;B[sh]
 ;W[rg]
 ;B[rc]
 ;W[og]
 ;B[sg]
 ;W[nf]
 ;B[rg]
 ;W[se]C[White 48 is the winning tesuji.]))
 (;W[kd]C[White 24 is an older joseki. Black gets a low position, but has the aji of a potential cutting point.]
 ;B[ld]
 ;W[kb]
 ;B[lb]
 ;W[la]
 ;B[kc]
 ;W[jb]
 ;B[id]
 ;W[hc]LB[mf:a]C[White is low, but can aim at 'a'.]
 ;B[ma]C[Black 33 may look a reasonable to separate White connection,
 but it's not.]
 ;W[rc]
 ;B[sb]
 ;W[pa]
 ;B[oa]
 ;W[na])
 (;W[me]LB[mf:a][ph:b]C[White 24 is playable regardless of the ladder.
 Black may try 'a' or 'b'.]
 (;B[mf]
 ;W[lf]LB[ld:b][md:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[md]
 ;W[ne]
 ;B[nf]
 ;W[lb]
 ;B[kb]
 ;W[lg]LB[oa:b][mb:c][nh:a]C[Black continues with 'a'. White 'b' and 'c' only look promising.]
 (;B[nh]
 ;W[kc]
 ;B[ld]
 ;W[jb]
 ;B[mb]
 ;W[ka]
 ;B[mc]
 ;W[ke]
 ;B[oa]
 ;W[qk]C[White discards seven stones, but gains a favorable result.])
 (;B[oa]
 ;W[mb]
 ;B[kc]
 ;W[pg]C[White wins the capturing race by one.])
 (;B[mb]
 ;W[mc]
 ;B[ld]
 ;W[ma]
 ;B[oa]
 ;W[jb]C[White 38 is the tesuji that puts White ahead.]))
 (;B[ld]C[Black 27 is not recommended.]
 ;W[nf]LB[ne:b][mg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mg]
 ;W[ne]LB[ng:b][oh:a][ph:c]C[Black may try 'a' to 'c'. None work.]
 (;B[oh]
 ;W[ng]
 ;B[ph]
 ;W[qi]
 ;B[nh]
 ;W[mh]
 ;B[lg]
 ;W[lh]
 ;B[kg]
 ;W[pg]
 ;B[og]
 ;W[ni]
 ;B[qg]
 ;W[oi]C[The black stones are captured.]
 ;B[rg]
 ;W[pi]
 ;B[pg]
 ;W[rf])
 (;B[ng]
 ;W[og]
 ;B[pg]
 ;W[oh])
 (;B[ph]
 ;W[oh]
 ;B[pg]
 ;W[pi]))
 (;B[ne]C[Black 29 is an obvious mistake.]
 ;W[mg]LB[md:b][oh:a]C[Black may try 'a' or 'b'. Neither work.]
 (;B[oh]
 ;W[md])
 (;B[md]
 ;W[mf]LB[oh:B][ph:A]
 (;B[ph]
 ;W[oh])
 (;B[oh]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[ng]
 ;W[qg]
 ;B[og]
 ;W[oi]
 ;B[nh]
 ;W[mh])))))
 (;B[ph]LB[lf:a][qi:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[lf]
 ;B[qi]
 ;W[qg]
 ;B[pi]
 ;W[ri]
 ;B[rj]
 ;W[sh]
 ;B[ke]
 ;W[mg]LB[na:a]C[White 'a' remains as sente.])
 (;W[qi]C[White 26 is an overplay.]
 ;B[mf]LB[ld:b][lf:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[lf]
 ;B[ld]
 ;W[nf]
 ;B[mg]
 ;W[ng]
 ;B[ne]
 ;W[md]
 ;B[oh]
 ;W[mh]
 ;B[lg]
 ;W[nh]
 ;B[oj]C[White has lost.])
 (;W[ld]
 ;B[kd]
 ;W[md]
 ;B[ke]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[mb]C[White loses the capturing race.]))))))
 (;W[nc]
 ;B[qg]
 ;W[rg]
 ;B[rh]LB[rc:A][qh:B]C[Black 15 and 17 are essential.
 'a' or 'b'.]
 (;W[rc]
 ;B[rb]
 ;W[sb]LB[nb:a][rd:b]C[White prepares for the ko.
 Black first plays the hane of 'a' to provide ko material. Jumping into the ko immediately with 'b' is a mistake.]
 (;B[nb]
 ;W[mb]
 ;B[rd]
 ;W[sd]
 ;B[sc]
 ;W[qh]
 ;B[pg]
 ;W[rc]
 ;B[mc]LB[ob:c][md:a][re:b]C[White continues the fight with 'a'. White 'b' and 'c' are mistakes.]
 (;W[md]
 ;B[sc]
 ;W[rf]
 ;B[se]
 ;W[ri]
 ;B[ph]
 ;W[qi]
 ;B[lc]LB[ob:b][ld:a]C[White continues with 'a' or 'b'.]
 (;W[ld]
 ;B[lb]
 ;W[jd]
 ;B[lg]C[Black gets a favorable result.])
 (;W[ob]
 ;B[ld]
 ;W[me]
 ;B[le]
 ;W[mf]
 ;B[lf]
 ;W[mg]
 ;B[pi]
 ;W[qk]
 ;B[pk]))
 (;W[re]C[White 30 is a mistake.]
 ;B[md]
 ;W[qi]
 ;B[ne]C[The result greatly favors Black.])
 (;W[ob]C[White 30 is a mistake.]
 ;B[sc]
 ;W[rf]
 ;B[se]
 ;W[ri]
 ;B[ph]
 ;W[qi]
 ;B[md]
 ;W[ne]
 ;B[mf]))
 (;B[rd]C[Black 21 is a mistake.]
 ;W[sd]
 ;B[sc]
 ;W[qh]
 ;B[pg]
 ;W[rc]
 ;B[rf]
 ;W[re]
 ;B[sg]
 ;W[qb]))
 (;W[qh]C[White 18 gives Black a favorable result.]
 ;B[pg]
 ;W[rf]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[lc]
 ;B[sb]
 ;W[se]
 ;B[ph])))
 (;B[pg]LB[ne:a][of:c][qg:d][rh:b]C[White continues with 'a' or 'd'. White must have the ladder to play 'b'. White must also have the ladder to play 'c', which White can use to simplify the position.]
 (;W[ne]
 ;B[of]LB[qg:A][rh:B]C['a' and 'b' are joseki.]
 (;W[qg]LB[nf:b][ph:a]C[Black continues with 'a' or 'b'.]
 (;B[ph]LB[nc:b][qh:a]C[White continues with 'a'. White 'b' is premature.]
 (;W[qh]
 ;B[pi]
 ;W[nc]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[mb]LB[na:b][ob:a]C[Black continues with 'a'. Black 'b' may be playable if Black has a favorable ladder to capture a cutting stone at the marked location.]MA[mc]
 (;B[ob]LB[sb:b][lc:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[lc]
 ;B[sb]
 ;W[ri]
 ;B[rj]
 ;W[sh]
 ;B[lg]LB[mg:b][qk:a]C[
 * Joseki *
 Black must not connect at 'a', as letting White play 'b' is bad.])
 (;W[sb]C[White 28 is not recommended.]
 ;B[lb]
 ;W[mc]
 ;B[ma]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[lc]
 ;W[ld]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hc]
 ;B[hb]
 ;W[gc]LB[qb:A][le:B]C[White seems to have built some thickness, but... 'a' or 'b'.]
 (;B[qb]
 ;W[ri]
 ;B[rj]
 ;W[sh]
 ;B[le]
 ;W[kd]
 ;B[nf])
 (;B[le]C[Black can erase it.]
 ;W[ke]
 ;B[nf]
 ;W[md]
 ;B[ra]
 ;W[ri]
 ;B[rj]
 ;W[sh]
 ;B[kf]C[Black 51 is a tesuji.]
 ;W[lf]C[If White 52...]
 ;B[lg])))
 (;B[na]C[This variation occurred in a 2002 game between 9-dan Chinese
 professionals Feng Yun and Jiang ZhuJiu.]
 ;W[ra]
 ;B[sb]
 ;W[pa]
 ;B[pb]
 ;W[ma]
 ;B[ob]
 ;W[qb]
 ;B[qa]
 ;W[ri]
 ;B[sa]LB[lc:b][qj:a]C[White can play 'a' if the two White stones at top cannot be caught in a ladder if Black cuts.]
 (;W[qj]C[White must have the ladder at the cutting point shown to play this way.]MA[mc]
 ;B[nf]C[Black plays here if the cut cannot be made.]
 ;W[ld])
 (;W[lc]C[White must play this way without a favorable ladder for the cutting point.]MA[mc]
 ;B[rj]
 ;W[sh])))
 (;W[nc]C[White 18 is not recommended.]
 ;B[qh]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[lc]
 ;B[sb]
 ;W[rh]
 ;B[ri]
 ;W[sh]
 ;B[qj]LB[sf:a][mg:B]
 (;W[sf]C[White must play 32 or die.]
 ;B[lg])
 (;W[mg]C[White 32 (or any other move than the marked location) is a mistake: White dies.]MA[sf]
 ;B[sf]
 ;W[rf]
 ;B[se]
 ;W[sc]
 ;B[sg])))
 (;B[nf]LB[nc:a][ph:b]C[White continues with 'a' or 'b'. White must have the ladder to play 'b'.]
 (;W[nc]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[qi]
 ;B[ph]
 ;W[rj]
 ;B[me]LB[lc:b][mc:a][ld:c]C[It is difficult to White to save the four stones. White may try 'a' to 'c'.]
 (;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc])
 (;W[lc]
 ;B[ld]
 ;W[mc]
 ;B[jc]LB[kc:a][kd:b]C[White may try 'a' or 'b'.]
 (;W[kc]
 ;B[jd])
 (;W[kd]
 ;B[ke]))
 (;W[ld]C[White may play 32 if he has occupied the star-point as shown.]
 ;B[pi]
 ;W[qj]
 ;B[md]
 ;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[kb]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[sb]
 ;B[qa]
 ;W[hb]
 ;B[hc]
 ;W[gb]
 ;B[fc]
 ;W[gc]
 ;B[gd]
 ;W[ib]
 ;B[fe]
 ;W[mf]
 ;B[le]
 ;W[mg]LB[ke:a][mi:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[ke]C[Black 57 is the vital point. Letting White play there and squeeze is bad.]
 ;W[mi]C[The joseki ends.]
 ;B[nh]C[Black 59 is an explemplary continuation.]
 ;W[mh]
 ;B[ok]LB[na:b][si:a]C[White may try for a two-stage ko with 'a', or risk damage with a direct ko beginning with 'b'.]
 (;W[si]C[Later, after playing White 62, the best White can do is get a two-stage ko.]
 ;B[pb]
 ;W[ra])
 (;W[na]C[White 62 is a direct ko, but White is in peril if losing the
 ko.]
 ;B[oa]
 ;W[pb]
 ;B[rg]
 ;W[si]
 ;B[rf]
 ;W[re]
 ;B[sa]C[White risks considerable damage if she loses the ko.]))
 (;B[mi]C[Black 57 or another similar move is a mistake.]
 ;W[ke]
 ;B[kd]
 ;W[lf]
 ;B[ld]
 ;W[je])))
 (;W[ph]LB[me:a][mf:b][oh:c]C[White must have the ladder. The continuation is based upon this.
 Black continues with 'a' or 'b'. 'c' is not recommended.]
 (;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[kd]LB[jd:B][je:A]C['a' or 'b'.]
 (;B[je])
 (;B[jd]
 ;W[jc]
 ;B[id]
 ;W[ic]
 ;B[hd]
 ;W[nb]
 ;B[ob]
 ;W[hc]
 ;B[gd]
 ;W[fc]))
 (;B[mf]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[ld]LB[id:a][qj:b]C[After this, 'a' and 'b' are miai for Black.])
 (;B[oh]
 ;W[pi]
 ;B[me]
 ;W[md]
 ;B[ld]))))
 (;W[rh]
 ;B[nc]
 ;W[nf]
 ;B[ph]LB[nh:B][qi:A]C['a' is joseki, 'b' a variation.]
 (;W[qi]
 ;B[rg]
 ;W[rf]
 ;B[ng]LB[le:A][mg:B]C['a' is joseki, 'b' a variation.]
 (;W[le]
 ;B[lg]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[jc]C[
 * Joseki *]
 ;B[pk])
 (;W[mg]LB[md:A][mh:B]C['a' or 'b'.]
 (;B[md]LB[le:A][nh:B]
 (;W[le]
 ;B[mh]LB[lg:A][nh:B]C['a' is correct, 'b' no help.]
 (;W[lg])
 (;W[nh]
 ;B[ni]))
 (;W[nh]
 ;B[ni]
 ;W[mi]
 ;B[oh]))
 (;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[oj])))
 (;W[nh]
 ;B[rg]
 ;W[qg]
 ;B[qh]
 ;W[rf]
 ;B[ri]
 ;W[sg]
 ;B[pj]
 ;W[rd]
 ;B[md])))
 (;W[rh]LB[nc:a][ne:b]C[White must have the ladder to play White 14 here: 'a' shows the continuation. Black 'b' shows Black's counter if the ladder is
 in Black's favor.]
 (;B[nc]LB[md:b][ne:a]C[White continues with 'a' or 'b'.]
 (;W[ne]
 ;B[of]LB[nf:a][qi:b]C[White 'a' is the correct continuation. White 'b' is a mistake.]
 (;W[nf]LB[ng:b][ph:a]C[Black continues with 'a', possibly the more reserved 'b'.]
 (;B[ph]
 ;W[qi]
 ;B[rg]
 ;W[rf]
 ;B[ng]LB[le:a][mg:b]C[White continues with 'a' or 'b'.]
 (;W[le]LB[kc:b][lg:a]C[Black continues with 'a' or 'b'.]
 (;B[lg]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[jc]
 ;B[qg]
 ;W[sg]
 ;B[pk]LB[pi:b][rk:a]C[White continues with 'a'. The counterattack of White 'b' is not recommended.]
 (;W[rk]LB[pi:a][ql:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pi]
 ;W[ql])
 (;B[ql]C[Black 35 is reckless.
 Yamabe played 35 against Sakata in a 1966 match, and regretted
 the move.]
 ;W[pi]
 ;B[oi]
 ;W[oj]
 ;B[pj]
 ;W[ni]
 ;B[oh]
 ;W[rl]
 ;B[qm]
 ;W[nj]
 ;B[nh]
 ;W[qo]
 ;B[nl]
 ;W[li]
 ;B[jg]
 ;W[rn]C[White 50 is a tight move that avoids the sente block at the marked location.]MA[rm]))
 (;W[pi]C[White 34 is an overplay.]
 ;B[oi]
 ;W[oj]
 ;B[pj]
 ;W[ni]
 ;B[oh]
 ;W[nj]LB[nh:a][rj:b]C[White 40 is sente. Black continues with 'a'. Black cannot play somewhere else, such as 'b'.]
 (;B[nh]
 ;W[rk]
 ;B[rj]
 ;W[qj]
 ;B[qk]
 ;W[sj]
 ;B[rl]
 ;W[ri]
 ;B[ol]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[lj]LB[mk:a][nl:b]C[White faces great difficulty trying to pull out the three White stones. White 'a' offers better prospects than 'b'.]
 (;W[mk]
 ;B[kl]
 ;W[mm]
 ;B[on]C[White faces a very difficult fight.])
 (;W[nl]C[White 54 is a mistake.]
 ;B[nm]
 ;W[ml]
 ;B[nk]
 ;W[mk]
 ;B[mj]
 ;W[ok]
 ;B[mi]
 ;W[nk]
 ;B[om]))
 (;B[rj]C[A move such as Black 41 is a mistake. Black must connect.]MA[nh]
 ;W[mg]
 ;B[mh]
 ;W[nh]
 ;B[mf]
 ;W[qh]
 ;B[og]
 ;W[mg])))
 (;B[kc]
 ;W[mg]
 ;B[mh]LB[lg:b][nh:a]C[White continues with 'a' or 'b'.]
 (;W[nh]
 ;B[ni]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[mi]
 ;W[pk]
 ;B[oj])
 (;W[lg]
 ;B[qg]
 ;W[sg]
 ;B[ni]
 ;W[ql])))
 (;W[mg]LB[md:d][mf:c][mh:a][nh:b]C[White 24 is a tough-minded move.
 Black continues with 'a' to 'd'.]
 (;B[mh]
 ;W[nh]
 ;B[ni]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[oj]
 ;W[ql]
 ;B[lh]
 ;W[ld]
 ;B[mc]
 ;W[kf]
 ;B[kc])
 (;B[nh]
 ;W[lf]
 ;B[mh]
 ;W[lh]
 ;B[li]
 ;W[kh]
 ;B[ki]
 ;W[jh])
 (;B[mf]
 ;W[nh]
 ;B[og]LB[md:c][le:b][lf:a]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[lf]
 ;B[me]
 ;W[md]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[kd]
 ;B[mh]
 ;W[lg]
 ;B[je]
 ;W[jd]
 ;B[ie]LB[hc:b][mi:a]C[White continues with 'a' or 'b'.]
 (;W[mi]
 ;B[id]LB[ic:a][pi:b]C[White continues with 'a'. White 'b' doesn't work.]
 (;W[ic]
 ;B[hc]
 ;W[jb]
 ;B[ib]
 ;W[jc]
 ;B[pi]C[Black escapes.]
 ;W[hb]
 ;B[gb]
 ;W[ia]
 ;B[qg]
 ;W[sg]
 ;B[pj])
 (;W[pi]C[White 42 is a mistake.]
 ;B[ni]
 ;W[lh]
 ;B[oi]C[Black escapes.]))
 (;W[hc]
 ;B[qg]
 ;W[sg]
 ;B[ni]
 ;W[lh]
 ;B[mi]
 ;W[li]
 ;B[lj]
 ;W[kj]
 ;B[lk]LB[qk:a]C[The fighting will continue to uncertain outcome. Black has the threat of the checking extension at 'a'.]))
 (;W[le]C[White 28 lacks force.]
 ;B[lf]
 ;W[ld]
 ;B[mh]
 ;W[lg]
 ;B[kf]C[White cannot possibly get a good result.]
 ;W[mb]
 ;B[ni]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[mc]
 ;W[lc]
 ;B[sb]LB[jd:c][qg:a][sg:b]C[Black easily lives in the corner with 41.
 Black still has the sente threat of 'a', followed by Black 'b'.
 There is also the threat of Black 'c'.
 This result clearly favors Black.])
 (;W[md]LB[ld:a][lf:b]C[Black continues with the tesuji of 'a', or possibly 'b' is Black has a favorable ladder.]
 (;B[ld]LB[mc:C][le:b][lf:a]C[Black 29 is a tesuji.
 White continues with 'a' or 'b'.]
 (;W[lf]
 ;B[mc]
 ;W[me]
 ;B[le]
 ;W[mf]
 ;B[mh]
 ;W[kf]
 ;B[ni]
 ;W[lh]
 ;B[mi])
 (;W[le]LB[lg:b][mh:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[mh]
 ;W[lg]
 ;B[mc]
 ;W[me]
 ;B[ke]
 ;W[lf]
 ;B[ni]
 ;W[lh]
 ;B[mi]LB[kd:a][pi:b]C[White continues with 'a' or 'b'.])
 (;B[lg]C[Black 31 is not recommended.]
 ;W[mh]LB[mc:a][lf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mc]
 ;W[me]
 ;B[ke]
 ;W[lf]
 ;B[kf]
 ;W[mf]C[Black has too many cutting points, and the Black group on the right is now in danger.])
 (;B[lf]C[Black 33 is a mistake, creating a race to capture that White wins.]
 ;W[lc]
 ;B[kd]
 ;W[mc]
 ;B[kc]
 ;W[kb]
 ;B[jb]
 ;W[lb]LB[jc:b][me:a][pi:c]C['b' and 'c' are miai. White wins the race to capture.
 Black may try 'a', but again loses.]
 ;B[me]
 ;W[ja]
 ;B[ib]
 ;W[nb]
 ;B[ob]
 ;W[pi])))
 (;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[le]
 ;W[lb]
 ;B[kb]
 ;W[kc]
 ;B[jc]LB[kd:a][lf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[kd]LB[jd:b][ke:a]C[Black continues with 'a', or 'b' if this is the only way for Black to have a favorable ladder.]
 (;B[ke]
 ;W[jd]
 ;B[id]
 ;W[lf]
 ;B[je]
 ;W[me]
 ;B[pi]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[sb]
 ;B[pb]LB[na:a]C[Black 'a' is sente; the corner is a ko.])
 (;B[jd]C[Black plays 39 only if it is the only way for Black to get a favorable ladder. This variation is slightly more favorable to White than playing on top of White 38.]
 ;W[lf]
 ;B[ke]
 ;W[me]))
 (;W[lf]C[White 38 is suicidal.]
 ;B[me]
 ;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[je]
 ;W[id]
 ;B[jb])))
 (;B[lf]C[Black might play 29 with a favorable ladder.])))
 (;B[md]LB[le:a][nh:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[le]C[White 26 is the proper move, showing good style.]
 ;B[mh]
 ;W[lg]
 ;B[lh]C[Black 29 is a likely continuation])
 (;W[nh]C[White 26 is not recommended.]
 ;B[ni]LB[oh:B][mi:A]C[Black 27 aims to set up a ko.]
 (;W[mi]
 ;B[oh]LB[qg:a]C[Black has a perfect ko threat at 'a', so White is at considerable
 disadvantage.])
 (;W[oh]C[White 28 is a mistake.]
 ;B[mh]
 ;W[og]
 ;B[oi]
 ;W[ng]
 ;B[lg]
 ;W[lf]
 ;B[mf]
 ;W[me]
 ;B[le])))))
 (;B[ng]
 ;W[mg]
 ;B[oh]LB[qg:a][nh:b]C[Black 21, seemingly yielding, is a cagey move.
 Black 21 was invented by Kajiwara Takeo. Variation 'a' is as first played in the 2nd round of the 1964 Oza title match against Otake Hideo.
 White 'b' is not recommended.]
 (;W[qg]
 ;B[ph]LB[mh:a][qj:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[mh]C[Original game continuation.]
 ;B[ri]
 ;W[rc]
 ;B[rb]
 ;W[sd]
 ;B[qh]
 ;W[sh]
 ;B[ld]
 ;W[lf]
 ;B[jd]
 ;W[qj]
 ;B[pj]
 ;W[qi]
 ;B[qk]
 ;W[rj]
 ;B[nj]
 ;W[lj])
 (;W[qj]C[White 24 is not recommended.]
 ;B[mh]LB[lf:a][lg:b]C[White may try 'a' or 'b'.]
 (;W[lf]
 ;B[lg]
 ;W[mf]
 ;B[kg]C[White will have trouble making good shape.])
 (;W[lg]
 ;B[le]C[Black 27 is the obvious move to ruin Black's shape.])))
 (;W[nh]LB[rg:b][qh:a]C[Black continues at 'a' or 'b'.]
 (;B[qh]
 ;W[rg]
 ;B[qj]
 ;W[ri]
 ;B[ni]
 ;W[mh]
 ;B[md])
 (;B[rg]
 ;W[qg]
 ;B[qh]
 ;W[rf]
 ;B[ri]
 ;W[sg]
 ;B[qi]))))
 (;W[qi]
 ;B[nf]C[The three white stones lose vital liberties.]))
 (;W[md]
 ;B[nf]LB[mc:b][rc:a][qi:c]C[White continues with 'a', 'b' or 'c'.]
 (;W[rc]
 ;B[rb]
 ;W[sd]
 ;B[lc]
 ;W[ld]
 ;B[kc]
 ;W[lf])
 (;W[mc]LB[rd:a][qh:b]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[re]
 ;B[qg]
 ;W[rg]
 ;B[se]
 ;W[rf]
 ;B[rb]
 ;W[pi]
 ;B[lg]LB[jd:a][qk:b]C['a' and 'b' are miai.])
 (;B[qh]
 ;W[rg]
 ;B[qj]
 ;W[ri]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[mb]
 ;W[lb]
 ;B[ma]
 ;W[kd]))
 (;W[qi]
 ;B[lf])))
 (;B[ne]
 ;W[md]
 ;B[me]
 ;W[ld]LB[le:B][qh:A]C['a' or 'b' are basically the same.]
 (;B[qh]
 ;W[ri]
 ;B[rg]
 ;W[qg]
 ;B[rf]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[og]
 ;W[qj]
 ;B[pi]
 ;W[oh]
 ;B[ng]
 ;W[oi])
 (;B[le]
 ;W[kd]
 ;B[qh]
 ;W[ri]
 ;B[rg]
 ;W[qg]
 ;B[rf]LB[rd:A][ph:B]
 (;W[rd]
 ;B[rc]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[og]
 ;W[qj]
 ;B[pi]
 ;W[oh]
 ;B[ng]
 ;W[oi])
 (;W[ph]
 ;B[qi]
 ;W[of]
 ;B[og]
 ;W[qj]
 ;B[pi]
 ;W[oh]
 ;B[ng]
 ;W[oi]))))
 (;W[of]C[White must have the ladder to play 14.]
 ;B[ne]
 ;W[og]
 ;B[md]
 ;W[ph])
 (;W[qg]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[ph]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rg]
 ;W[rf]
 ;B[rd]
 ;W[sd]
 ;B[sc]
 ;W[of]
 ;B[og]
 ;W[rc]
 ;B[mb]
 ;W[lb]
 ;B[sc]
 ;W[oh]
 ;B[ng]
 ;W[rc]
 ;B[mc]
 ;W[re]
 ;B[lc]
 ;W[jc]
 ;B[jb]
 ;W[ib]
 ;B[kb]LB[hd:A][nh:B]C['a' or 'b'.]
 (;W[hd])
 (;W[nh])))
 (;B[ne]LB[nc:B][md:A]C[White must have the ladder.
 'a' is correct. 'b' is a mistake.]
 (;W[md]LB[me:a][pg:b]C[White 14 is the only possible good move.
 Black continues with 'a' or 'b'.]
 (;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[ke]LB[nb:A][jd:B]C['a' or 'b'.]
 (;W[nb]
 ;B[ob]
 ;W[jd]LB[qg:B][qh:A]C['a' or 'b'.
 'a' is a trick play.]
 (;B[qh]LB[pg:a][rh:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pg]
 ;B[ph]LB[of:c][og:b][qg:d][rh:a]C[White continues with the tesuji of 'a'. White 'b', 'c' and 'd' is getting tricked, because White's life will depend on a ko.]
 (;W[rh]LB[rg:B][ri:A]C['a' to settlem 'b' to start a fight.]
 (;B[ri]
 ;W[og]
 ;B[qg]
 ;W[of]
 ;B[nh]C[
 * Joseki *]
 ;W[oh]
 ;B[oi]
 ;W[rg]
 ;B[pi]
 ;W[ng]
 ;B[mg]
 ;W[mh]
 ;B[ni]
 ;W[lg]
 ;B[mf]
 ;W[rc]
 ;B[rb]
 ;W[sc]LB[sb:a][sh:b]C[Black continues with 'a'. Black 'b is an overplay.]
 (;B[sb]
 ;W[re]LB[je:a][kh:b]
 (;B[je]LB[ie:a][lh:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ie]
 ;B[kh]
 ;W[if]
 ;B[lh])
 (;W[lh]C[White 48 is an overplay.]
 ;B[ie]))
 (;B[kh]C[Black 47 is an overplay, considering White can escape.]
 ;W[lh]
 ;B[ki]
 ;W[kg]
 ;B[jg]
 ;W[mj]
 ;B[mi]
 ;W[li]
 ;B[lj]
 ;W[kj]
 ;B[lk]
 ;W[jh]
 ;B[ji]
 ;W[jf]
 ;B[ih]
 ;W[kf]
 ;B[je]
 ;W[if]
 ;B[ie]))
 (;B[sh]C[Black 45 aims to kill, but White wins the capturing race with a sacrifice.]
 ;W[sf]
 ;B[re]
 ;W[rd]
 ;B[se]
 ;W[sb]
 ;B[qb]
 ;W[pa]
 ;B[nf]LB[oa:a][pf:b]C[White continues with 'a'. White cannot save the center stones with 'b'.]
 (;W[oa]
 ;B[pf]
 ;W[rf]
 ;B[si]
 ;W[nc]
 ;B[ra]
 ;W[qa]
 ;B[sg]
 ;W[sd]
 ;B[se]
 ;W[na])
 (;W[pf]C[White can resign now.]
 ;B[ra]
 ;W[oa]
 ;B[si]
 ;W[nc]
 ;B[sg]
 ;W[rf]
 ;B[sa]
 ;W[sd]
 ;B[se]
 ;W[re]
 ;B[se])))
 (;B[rg]
 ;W[qg]
 ;B[ri]
 ;W[ng]))
 (;W[og]C[White 26 is a mistake.]
 ;B[qg]
 ;W[of]
 ;B[nh]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[sd]
 ;B[sc]
 ;W[oh]
 ;B[rf]
 ;W[oi]
 ;B[re]
 ;W[pf]
 ;B[lh])
 (;W[of]C[White 26 is a mistake.]
 ;B[ng]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[sd]
 ;B[sc]LB[og:a][oh:b]C[White may try 'a' or 'b'.]
 (;W[og]
 ;B[oh]
 ;W[rc]
 ;B[re]
 ;W[rf]
 ;B[sc]
 ;W[nf]
 ;B[se]
 ;W[mg]
 ;B[nh]
 ;W[mf]
 ;B[je])
 (;W[oh]LB[se:b][rf:a]C[Black continues with the tesuji of 'a'. Black 'b' is a mistake.]
 (;B[rf]
 ;W[qg]
 ;B[og]
 ;W[rc]
 ;B[re]
 ;W[rg]
 ;B[rh]
 ;W[sf]
 ;B[sc]
 ;W[nf]
 ;B[se]
 ;W[mg]
 ;B[nh]
 ;W[mf]
 ;B[sg]
 ;W[pf]
 ;B[je])
 (;B[se]C[Black 35 is a mistake.]
 ;W[og])))
 (;W[qg]
 ;B[og]
 ;W[of]
 ;B[ng]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rd]
 ;W[sd]
 ;B[sc]))
 (;W[rh]C[White 24 is a mistake in order.]
 ;B[ri]
 ;W[pg]
 ;B[oh]C[There are several possible continuations, but generally White will have to get life on the side while Black builds thickness.]))
 (;B[qg]
 ;W[rg]
 ;B[pg]
 ;W[rh]
 ;B[pj]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[sb]
 ;W[qk]))
 (;W[jd]
 ;B[qh]
 ;W[pg]
 ;B[ph]
 ;W[rh]
 ;B[ri]
 ;W[og]
 ;B[qg]
 ;W[of]
 ;B[nh]
 ;W[oh]
 ;B[oi]
 ;W[ng]
 ;B[mg]
 ;W[rg]
 ;B[pi]
 ;W[rc]
 ;B[rb]
 ;W[sc]
 ;B[sb]
 ;W[mh]
 ;B[ni]
 ;W[lg]
 ;B[mf]
 ;W[re]))
 (;B[pg]LB[qg:b][rh:a]C[White plays 'a' with a favorable ladder, but must play 'b' if the ladder to the lower left is unfavorable.]
 (;W[rh]LB[me:d][ng:b][ph:c][qh:a]C[Black continues with 'a', 'b' to 'd'.
 'a' is only a punishment, if White doesn't have the ladder, not joseki.]
 (;B[qh]LB[qi:B][ri:A]C['a' is correct. 'b' is a mistake.]
 (;W[ri]
 ;B[me]
 ;W[ld]
 ;B[rg]
 ;W[qg]
 ;B[rf]
 ;W[ph]
 ;B[qi]
 ;W[of]
 ;B[og]
 ;W[qj]
 ;B[pi]
 ;W[oh]
 ;B[ng]
 ;W[oi])
 (;W[qi]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[ri]
 ;W[rg]
 ;B[rj]))
 (;B[ng]LB[nb:b][rc:c][kd:a][qi:d]C[White continues with 'a' or 'b'. White 'c' and 'd' not recommended.]
 (;W[kd]
 ;B[mb]LB[nb:a]C[The difference between Black 19 and a White forcing move at 'a' is big.]
 ;W[qi]LB[kg:A][kh:B]C['a' or 'b'.]
 (;B[kg]
 ;W[id]C[
 * Joseki *])
 (;B[kh]
 ;W[id]))
 (;W[nb]
 ;B[qg]
 ;W[rg]
 ;B[rd]
 ;W[se]
 ;B[ob]
 ;W[me]
 ;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[kf]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[rc]
 ;B[rb]
 ;W[sc]
 ;B[sb]
 ;W[sd]
 ;B[kg]
 ;W[jf])
 (;W[rc]C[White 18 is too small.]
 ;B[rb]
 ;W[sd]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[jc]
 ;B[lf])
 (;W[qi]C[White 18 is a mistake.]
 ;B[ke]
 ;W[nb]
 ;B[qg]
 ;W[rg]
 ;B[rd]
 ;W[se]
 ;B[ob]C[White will have trouble settling the group at top.]))
 (;B[ph]
 ;W[qi]LB[mb:a][rd:b]C[Black continues with 'a'. Black 'b' is not reocmmended.]
 (;B[mb]
 ;W[me]
 ;B[ng])
 (;B[rd]C[Black 19 is not recommended.]
 ;W[re]
 ;B[rg]LB[rc:a][qg:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rc]LB[rb:b][qg:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qg]
 ;W[rb]
 ;B[mb]
 ;W[me]LB[lb:b][ng:a]C['a' and 'b' are now miai. White has no complaints.])
 (;B[rb]LB[sd:b][qg:a]C[Black 23 is not recommended.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[qg]
 ;B[qh]
 ;W[ri]
 ;B[sc]
 ;W[sg]
 ;B[ng]
 ;W[me]
 ;B[mf]
 ;W[lf]
 ;B[lg]
 ;W[kf])
 (;W[sd]C[White 24 is a mistake.]
 ;B[qg]
 ;W[sb]
 ;B[qb]
 ;W[sf]
 ;B[sg]
 ;W[rf])))
 (;W[qg]C[White 22 is a mistake.]
 ;B[qh]LB[rc:b][sg:a]C[White continues with 'a' or 'b'.]
 (;W[sg]
 ;B[ri]
 ;W[rf]
 ;B[qj]
 ;W[nb]
 ;B[rc]
 ;W[se]
 ;B[ob]
 ;W[me])
 (;W[rc]
 ;B[ri]
 ;W[rb]
 ;B[lf]C[With 27, Black willingly discards the four Black stones in the corner.]
 ;W[kd]
 ;B[jf]C[White has considerable territory, but Black's thickness holds considerable promise.]))))
 (;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[sd]
 ;B[sb]LB[nb:b][ri:a]C[White continues with 'a'. White 'b' is premature.]
 (;W[ri]
 ;B[if]
 ;W[he]
 ;B[qj]
 ;W[nb]
 ;B[ob]
 ;W[rj]
 ;B[qk])
 (;W[nb]C[White 28 is premature.]
 ;B[ri]
 ;W[ob]
 ;B[rg]
 ;W[rf]
 ;B[qg]
 ;W[qb]
 ;B[pb]
 ;W[pa]
 ;B[qa]
 ;W[oa]
 ;B[nc]
 ;W[mc]
 ;B[qb]
 ;W[lb]
 ;B[sf]
 ;W[se]LB[rd:b][sg:a]
 (;B[sg]C[Black creates a seki.]
 ;W[ra]
 ;B[rd]
 ;W[re]C[The corner is a seki, leaving Black with superior thickness.])
 (;B[rd]C[Black goes for an approach-move-ko.]
 ;W[re]
 ;B[sc]))))
 (;W[qg]C[White 16 is an unfortunate necessity if White does not have a
 favorable ladder.]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[qh]
 ;W[rh]
 ;B[ri]LB[rc:c][sg:a][ph:b]C[White continues with 'a'.
 White 'b' is not recommended, but is part of a very famous game.
 White 'c' is a mistake.]
 (;W[sg]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[sc]
 ;B[sb]
 ;W[se]C[White ends in gote.]
 ;B[jf]C[Black gets the choice play.])
 (;W[ph]C[White fearlessly sets up a ko with 21.
 This pattern arose in a game between Gen'an Inseki (1798-1859) and Shusaku (1829-62); the famous game with the "ear-reddening" move 127 by Shusaku.]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[rg]
 ;W[rf]LB[rd:a][sh:b]C[Black continues with 'a' (as in the game), leaving ko threats.
 Taking with 'b' is a fatal mistake.]
 (;B[rd]
 ;W[sd]
 ;B[sc]LB[of:a][oh:b]C[White continues with 'a'. White 'b' is too leisurely.]
 (;W[of]
 ;B[og]
 ;W[rc]
 ;B[mb]
 ;W[lb]
 ;B[sc]
 ;W[oh]
 ;B[ng]
 ;W[rc]
 ;B[mc]
 ;W[re]
 ;B[lc]C[Black gets a favorable result.]
 ;W[jc]
 ;B[jb]
 ;W[ib]
 ;B[kb]
 ;W[nh]
 ;B[mg]
 ;W[ic]
 ;B[qb]
 ;W[nj]
 ;B[sh]
 ;W[sf]
 ;B[qm])
 (;W[oh]C[White 34 is a fatal mistake.]
 ;B[sf]
 ;W[sg]
 ;B[re]
 ;W[se]
 ;B[sf]
 ;W[se]
 ;B[of]C[White has lost.]))
 (;B[sh]C[Black 31 is a mistake.]
 ;W[qb]
 ;B[rd]
 ;W[sd]
 ;B[sc]
 ;W[of]
 ;B[og]
 ;W[rc]C[Black has no good ko threats.]))
 (;W[rc]C[White 24 is a mistake.]
 ;B[rb]
 ;W[sb]
 ;B[rg]
 ;W[rf]
 ;B[sh]
 ;W[rd]
 ;B[qb]
 ;W[nb]
 ;B[se]
 ;W[sf]
 ;B[ra]))))
 (;W[nc]LB[nb:A][pg:B]C['a' is one of different punishments, 'b' gives Black too much
 influence.]
 (;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[ld]
 ;B[me]
 ;W[kd]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[sb]
 ;W[ri]
 ;B[qj])
 (;B[pg]
 ;W[rh]
 ;B[rd]
 ;W[re]
 ;B[qg]
 ;W[rg]
 ;B[se]
 ;W[rf]
 ;B[me]
 ;W[lc]
 ;B[rb]
 ;W[pi]
 ;B[ld]
 ;W[mb]
 ;B[kc]
 ;W[kb]
 ;B[md]
 ;W[mc]
 ;B[jc]
 ;W[jb]
 ;B[ic]
 ;W[ob]
 ;B[pb]
 ;W[oa])))
 (;B[ld]LB[mc:Z][of:X][qh:Y]C[Black 13 is a trick play.
 For other possible continuations than the one given, learn what happens if, instead of Black 13 here, Black plays X, White Y, Black Z or 13.]
 ;W[ne]C[White first needs to provide escape for the two stones.]
 ;B[of]
 ;W[qh]C[White 16 is the only continuation.]))
 (;W[nc]LB[nb:a][ne:c][of:d][qf:b]C[Black 'a' is the correct refutation.
  'b' looks like a better move, and it leads to a more favorable position for Black. However the continuation is more complex, with more room for error. 'b' is where White needs the ladder.
 Black can always get a good result with 'c'.
 Black 'd' leads to a good result. Depending on the surrounding positions, the outcome can be reasonable for White too.]
 (;B[nb]
 ;W[mb]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rc]
 ;B[rb]
 ;W[of]
 ;B[ne]LB[me:b][qg:a]C[White 'a' shows how both settle the position, resulting in a slightly more favorable position for Black.
 White 'b' shows how White can introduce further complications in the position. This leads to a favorable ko for Black, but there is plenty of scope for a slip-up.]
 (;W[qg]
 ;B[mc]TR[pf][qf]C[If both marked groups are now captured, the result is considered favorable for Black.]MA[nc][nd][od]
 ;W[pg]
 ;B[md])
 (;W[me]
 ;B[nf]
 ;W[og]
 ;B[md]
 ;W[mc]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[rd]
 ;B[sf]
 ;W[qb]
 ;B[pb]
 ;W[ra]
 ;B[qa]
 ;W[se]
 ;B[re]
 ;W[sb]
 ;B[qb]
 ;W[rf]
 ;B[sg]
 ;W[qh]))
 (;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rc]LB[rb:a][sf:b]C[Black continues with 'a'. Black 'b' is possible, as shown by the professional game from which this variation came.]
 (;B[rb]
 ;W[of]
 ;B[ne]
 ;W[qg]LB[me:b][pg:a]C[Black 'a' leads to White setting up a ladder at 'a'. Black 'b' prevents the ladder, but the result is hardly better.]
 (;B[pg]
 ;W[me]LB[og:a]C[White captures two stones in a ladder, as White 'a' is atari.]
 ;B[nf]
 ;W[og]
 ;B[ph]
 ;W[ng])
 (;B[me]
 ;W[pg]
 ;B[nb]C[White has made a very thick capture. Later in the game White may have an opportunity to pull out the marked stones at the top.]MA[nc][nd][od]))
 (;B[sf]C[Black 17 was played by Yoshi Ishida against Sakata Eio in the 1st game of the 1975 Honinbo title.]
 ;W[rd]
 ;B[rb]
 ;W[qb]
 ;B[pb]
 ;W[ra]
 ;B[qa]
 ;W[sb]
 ;B[sa]
 ;W[of]
 ;B[ne]
 ;W[ra]
 ;B[me]
 ;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[ob]
 ;W[og]
 ;B[ph]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[na]
 ;B[mg]C[Black 41 is the proper continuation, but not the continuation of the 1st 1975 Honinbo title game.
 Given the situation as shown, Black has a favorable outcome, given the solid thickness on both sides, despite the corner sacrifice.]))
 (;B[ne]LB[ob:c][me:a][qf:b]C[Ishida Yoshio considered this move, playing Sakata Eio during the first game of the 1975 Honinbo title match. He discarded it, although it was actually the best move in that position.
 White has a reasonable continuation at 'a'. White 'b' leads to a favorable position for Black. White 'c' does not work.]
 (;W[me]
 ;B[qg]C[Black 15 is simple but effective.])
 (;W[qf]C[White 14 is not recommended.]
 ;B[me]
 ;W[nb]
 ;B[rd]
 ;W[pg]
 ;B[lc]
 ;W[ob]
 ;B[pb]LB[pa:a][lb:b]C[White's only chance is to set up a semeai with the corner at 'a'. The result is a seki, but favorable for Black.
 Trying to break out at 'b' doesn't work.]
 (;W[pa]C[White 22 creates a seki, to Black's advantage.]
 ;B[rb]
 ;W[ra]
 ;B[mb]
 ;W[re]
 ;B[sb]
 ;W[sd]
 ;B[rc]
 ;W[qa]
 ;B[oa]
 ;W[se]
 ;B[md]
 ;W[sc]
 ;B[mc]
 ;W[na]
 ;B[ma]
 ;W[oa]C[Black's thickness is an order of magnitude better than White's.])
 (;W[lb]
 ;B[of]
 ;W[qh]
 ;B[kb]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[mb]))
 (;W[ob]
 ;B[pb]
 ;W[nb]
 ;B[qf]C[Black captures the marked white stones, regardless of what White tries next.]MA[qd][pe][qe]
 ;W[rc]
 ;B[rb]
 ;W[pa]
 ;B[qb]
 ;W[rf]LB[sd:a][rg:b]TR[ne]C['a' is the key move for Black.
 Black 'b' reduces the effectiveness of the extension of Black 13.]
 (;B[sd]
 ;W[re]
 ;B[rg]
 ;W[qg]
 ;B[pg]LB[sg:b][qh:a]C[White 'a' nor 'b' work.]
 (;W[qh]
 ;B[sf])
 (;W[sg]
 ;B[rh]LB[sb:b][sc:a]C[If White plays 'a', Black captures cleanly. If White plays 'b' it becomes ko, but White will never have a big enough threat.]
 (;W[sc]
 ;B[sb]
 ;W[rd]
 ;B[se])
 (;W[sb]
 ;B[rd]
 ;W[ra])))
 (;B[rg]
 ;W[rd]LB[sb:a][sc:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[sb]
 ;W[qg]
 ;B[sf]
 ;W[re]
 ;B[pg]
 ;W[qh]
 ;B[rh]
 ;W[ph]C[The marked points are White's miai to reduce the effectiveness of the black wall.]MA[og][ri])
 (;B[sc]C[Black 25 is a mistake.]
 ;W[sb]C[White can now get a ko or seki.]))))
 (;B[of]LB[rc:b][re:c][qf:a]C[White continues at 'a' or 'b'. White 'c' has appeared in professional play.]
 (;W[qf]LB[nc:12][of:13][qf:14]C[For continuation see the variation of White playing 14 before 12.])
 (;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[nb]
 ;W[mb]LB[ob:A][qf:B]C['a' or 'b'.]
 (;B[ob]LB[lc:B][qg:A]C['a' is correct. 'b' is a mistake.]
 (;W[qg]
 ;B[mc])
 (;W[lc]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[sb]
 ;B[qb]))
 (;B[qf]
 ;W[sb]
 ;B[ob]TR[qb][mc]C[The marked points are miai for White.]))
 (;W[re]TR[cd][ed]C[White 14 appeared in a game with the marked black shimari in the upper left corner.]
 ;B[qf]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[ld]
 ;B[qb]
 ;W[rf]
 ;B[rg]
 ;W[rh]
 ;B[sg]
 ;W[sf]
 ;B[qh]
 ;W[sd]
 ;B[pa]
 ;W[ic]C[The relationship of White 32 with the black position in the upper left makes this a playable variation for both sides.]))))
 (;B[qf]LB[nc:B][qc:A]C[White punishes on 'a', 'b' is possible only with the ladder.]
 (;W[qc]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld]LB[kc:A][lc:B]C[Black has two weaknesses now.]
 (;B[kc]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[mf]
 ;W[rf]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[sf]
 ;W[sh]
 ;B[rd]
 ;W[pg]
 ;B[rf]
 ;W[rc]LB[kd:B][ke:A]
 (;B[ke]
 ;W[kd]
 ;B[jd]
 ;W[lc]
 ;B[lb]
 ;W[kb]
 ;B[jc]
 ;W[mb]
 ;B[le]
 ;W[la]
 ;B[me]
 ;W[lb]
 ;B[nb]
 ;W[pb])
 (;B[kd]
 ;W[le]
 ;B[kf]
 ;W[lf]
 ;B[lg]
 ;W[nf]))
 (;B[lc]
 ;W[kd]
 ;B[kc]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[mf]
 ;W[rf]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[sf]
 ;W[sh]
 ;B[rd]
 ;W[pg]
 ;B[rf]
 ;W[rc]
 ;B[jd]
 ;W[kf]))
 (;W[nc]
 ;B[qc]LB[of:A][rf:B]C['a' starts the ladder.
 'b' -> sente ko for Black.]
 (;W[of]
 ;B[ne]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[pg]
 ;W[me]
 ;B[nf]
 ;W[og]
 ;B[ph]
 ;W[ng]
 ;B[mf]
 ;W[lf])
 (;W[rf]
 ;B[rg]LB[re:B][qg:A]
 (;W[qg]
 ;B[re]
 ;W[rd]
 ;B[sf]
 ;W[of]
 ;B[ne]
 ;W[pg]
 ;B[rf])
 (;W[re]
 ;B[og]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ob]
 ;B[sd]
 ;W[sc]
 ;B[sf]
 ;W[rd]
 ;B[sg]
 ;W[se]
 ;B[sa]
 ;W[ra]
 ;B[qa]
 ;W[pa]
 ;B[sa])))))))
 (;W[pc]
 ;B[pe]
 ;W[nc]
 ;B[ob]LB[nb:A][pb:B]C['a' or 'b' fail.
+]
 (;W[nb]LB[pb:B][oe:A]C['a' takes some advantage in a safe way, 'b' destroyes everything, but depends on the ladder.
+]
 (;B[oe]
 ;W[nd]
 ;B[qc]
 ;W[pb]
 ;B[qb]
 ;W[oa]
 ;B[rd])
 (;B[pb]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[nd]
 ;W[oe]LB[mc:B][of:A]C['a' ladder, 'b' disaster.
+]
 (;B[of]
 ;W[ne]
 ;B[md]
 ;W[qa])
 (;B[mc]
 ;W[of]
 ;B[pg]
 ;W[og]
 ;B[oh]
 ;W[md]
 ;B[ne]
 ;W[me]
 ;B[nf]
 ;W[ng]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[mb]
 ;B[lg]
 ;W[ni]
 ;B[lc]
 ;W[qa])))
 (;W[pb]
 ;B[nd]
 ;W[oe]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[nf]
 ;W[ne]
 ;B[me]
 ;W[md]
 ;B[of]
 ;W[nd]
 ;B[qc]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[sb]
 ;B[sc]
 ;W[kb]
 ;B[pa])))
 (;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[qe]
 ;B[qc]
 ;W[qi]TR[pf]C[Now the triangled stone is a peep against a bamboo - questionable shape.]))
 (;W[]C[If simplicity is the only goal, White may play elsewhere. White lives in the corner, giving Black considerable thickness.]
 ;B[pd]LB[qc:b][qe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qe]LB[qc:b][qf:a]C[Black continues with 'a'. Black 'b' is too mild.]
 (;B[qf]
 ;W[pe]
 ;B[oe]
 ;W[pb]
 ;B[ob]LB[pc:b][rf:a]C[White continues with 'a'. White 'b' is a timing mistake.]
 (;W[rf]
 ;B[rg]
 ;W[re]
 ;B[of]LB[pc:A][qh:B][dp:C]C[White continues with 'a' or 'b'. White plays elsewhere 'c' at considerable cost.]
 (;W[pc]
 ;B[od]
 ;W[oa]C[
 * Joseki *])
 (;W[qh]
 ;B[qg]
 ;W[pc]
 ;B[od]
 ;W[oa])
 (;W[]C[White plays elsewhere at heavy cost (though not a fatal mistake).]
 ;B[qb]LB[rb:A][pc:B]C['a' is correct. 'b' is a mistake.]
 (;W[rb]LB[ra:B][qc:A]C['a' is correct. 'b' is a mistake.]
 (;B[qc]
 ;W[rc]
 ;B[ra]
 ;W[sd]
 ;B[sf]
 ;W[sb])
 (;B[ra]
 ;W[qc]
 ;B[pa]))
 (;W[pc]
 ;B[pa]
 ;W[od]
 ;B[nd])))
 (;W[pc]C[White 11 is a mistake.]
 ;B[od]
 ;W[rb]C[White must defend at 13 to live in the corner.]
 ;B[rf]
 ;W[rd]C[White must respond to Black 14.]))
 (;B[qc]C[Black 6 is too mild.]
 ;W[rc]
 ;B[qb]
 ;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qi]))
 (;W[qc]C[White 5 is a mistake.]
 ;B[qe]C[Black 6 gives good shape.]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[mc]
 ;W[rb]C[Black gets an extremely favorable result.])))
 (;B[ph]LB[od:A][qf:B]C[
 -Space High Pincer = Sangen Takabasami = Sekan Gaojia = San Gaojia
 --------------------------------------------------------------------
 Black 3 is not an effective pincer locally, but may be strategically sensible.
 'a' is correct, 'b' is questionable.
+]
 (;W[od]
 ;B[nd]
 ;W[oe]
 ;B[pc]
 ;W[qc]
 ;B[ne]
 ;W[nf]
 ;B[of]LB[pd:B][qf:A]C['a' or 'b'.]
 (;W[qf]
 ;B[pf]
 ;W[qe]
 ;B[nh]
 ;W[mf]
 ;B[lc])
 (;W[pd]
 ;B[lc]
 ;W[mf]
 ;B[pf]
 ;W[rf]))
 (;W[qf]LB[qc:a][of:b]C[Black continues with 'a'. Black 'b' is slack.]
 (;B[qc]
 ;W[rc]
 ;B[pd]
 ;W[qb]
 ;B[qe]
 ;W[pc]
 ;B[rd]
 ;W[qc]
 ;B[pe]LB[nc:A][re:B]C['a' gives a wall to the right, 'b' to the top side and center.]
 (;W[nc]
 ;B[od]
 ;W[ob]
 ;B[nd]
 ;W[mc]
 ;B[le])
 (;W[re]
 ;B[rf]
 ;W[sd]
 ;B[pf]C[End of joseki.]
 ;W[qg]C[That just helps Black.]
 ;B[rg]
 ;W[qh]
 ;B[qi]
 ;W[rh]
 ;B[ri]
 ;W[sf]
 ;B[pg]
 ;W[sg]))
 (;B[of]C[Black 5 is slack.]
 ;W[od]
 ;B[nd]
 ;W[pc]
 ;B[ob])))
 (;B[lc]C[
 Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
 -------------------------------------------------------------
 too narrow
+]
 ;W[pc]
 ;B[od]
 ;W[qf]C[Black overconcentrated.]))
 (;W[pe]LB[qc:e][pd:b][qd:a][oe:d][qg:c][qh:f]C[
 Takamoku Kakari
 -------------------
 White prevents Black from gaining influence, but in the local context, abandoning profit in the corner entails a loss.
 Black 'a' and 'b' are best. Black 'c' emphasizes the right side. Black 'd' emphasizes influence over the top side. Black 'e' emphasizes territory.
 'f' is not recommended.
 e5, d4, c 3, b2, a1
+]
 (;B[qd]LB[pd:b][qe:a]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 Black 3 secures the corner. In the local context Black is satisfied.
 White continues with 'a'. White 'b' is a vulgar mistake.
+]
 (;W[qe]LB[pd:b][rd:a]C[White 4 is absolutely necessary.
 Black continues with 'a' or 'b'.]
 (;B[rd]LB[nd:e][od:f][me:d][ne:c][qi:a][qj:b]C[White continues with 'a' to 'c', 'd'. White 'e' and 'f' are not recommended.
 e5, d4, c3, b2, a1]
 (;W[qi]LB[nd:a][dp:b]C[Black plays at 'a' or elsewhere ('b').]
 (;B[nd]LB[qg:a]C[
 * Joseki *
 Black 'a' after the joseki is not recommended.]
 ;W[]C[White plays elsewhere.]
 ;B[qg]C[Black 8 is not an effective invasion.]
 ;W[pg]LB[re:b][qh:a]C[Black may try 'a' or 'b'.]
 (;B[qh]
 ;W[ph]
 ;B[ri]
 ;W[rj]
 ;B[qj]
 ;W[pi]
 ;B[rk]
 ;W[rh]
 ;B[sj]
 ;W[rg])
 (;B[re]LB[rf:b][rg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rg]
 ;B[qf]
 ;W[rf]
 ;B[qh]
 ;W[ph]
 ;B[rh]
 ;W[ri]
 ;B[sf]
 ;W[pf]
 ;B[sg]
 ;W[oj])
 (;W[rf]C[White 11 is a mistake.]
 ;B[rg]C[Black can connect however White plays.])))
 (;B[]LB[mc:d][md:b][nd:a][re:c]C[Black plays elsewhere. White presses with 'a' or 'b'. White 'c' is also possible. White 'd' is unreasonable.]
 (;W[nd]
 ;B[od]
 ;W[oe]LB[ne:b][re:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[re]
 ;W[qg]
 ;B[mb])
 (;B[ne]C[Black 10 is needlessly aggressive.]
 ;W[ld]LB[md:b][nf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nf]
 ;W[nc]
 ;B[re]
 ;W[qg]C[Black gets the worst of it. Taking care of the two Black center
 stones will be a burden.])
 (;B[md]C[Black 12 is obvious, and a mistake.]
 ;W[me]
 ;B[nc]
 ;W[nf]C[White squeezes.])))
 (;W[md]C[keima kikashi (knight forcing move)]
 ;B[nc]
 ;W[ne]
 ;B[lc])
 (;W[re]LB[nd:a][dp:b]C[Black 'a' is essential. Black cannot afford to play elsewhere ('b').]
 (;B[nd]C[Black 8 is essential.])
 (;B[]C[Black plays elsewhere, a mistake.]
 ;W[pc]
 ;B[pd]
 ;W[od]
 ;B[pb]
 ;W[nc]
 ;B[ob]
 ;W[nb]LB[rb:a][nd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rb]C[Black makes eye shape.]
 ;W[nd])
 (;B[nd]C[Black 17 is not recommended.]
 ;W[oe]
 ;B[rb]
 ;W[md]
 ;B[ne]
 ;W[mf]
 ;B[nf]
 ;W[ng]C[Black cannot escape.])))
 (;W[mc]C[Locally, White 7 is unreasonable, though it may be helpful toward
 the upper left.]
 ;B[nc]
 ;W[md]
 ;B[oe]
 ;W[pg]
 ;B[ne])))
 (;W[qj]
 ;B[nd]LB[ne:b][ph:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ph])
 (;W[ne]C[White 8 is not recommended.]
 ;B[me]
 ;W[mf]LB[le:b][oe:a]C[Black continues with 'a'. Black 'b' is too mild.]
 (;B[oe]LB[nf:b][of:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[of]
 ;B[nf]
 ;W[ng]
 ;B[ne]
 ;W[og]
 ;B[lf]
 ;W[mg])
 (;W[nf]C[White 12 is a mistake.]
 ;B[of]
 ;W[pd]
 ;B[pc]LB[md:a][od:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[md]
 ;W[md]
 ;B[od]
 ;W[le]
 ;B[qh]C[Black captures the three White stones and gets a very favorable result.])
 (;W[od]C[White 16 is a mistake.]
 ;B[pg]C[Black captures White's four stones.])))
 (;B[le]C[Black 11 is too mild.]
 ;W[oe]
 ;B[mc])))
 (;W[ne]LB[md:B][od:A]C['a' is joseki, 'b' is a mistake.]
 (;B[od]
 ;W[oe]LB[md:b][re:a]C[Black continues with 'a'. Black 'b' is a mistake in order.]
 (;B[re]
 ;W[qg]LB[lc:B][md:A]C['a' or 'b'.]
 (;B[md]C[
 * Joseki *])
 (;B[lc]))
 (;B[md]C[Black 9 is a mistake in order of play.]
 ;W[pd]
 ;B[pc]
 ;W[qc]LB[qb:b][rc:a][re:c]C[Answering White 12 is a problem for Black.
 Black continues with 'a'. Black 'b' makes White 'c' sente, giving White excellent thickness.]
 (;B[rc]
 ;W[qb]
 ;B[rb]
 ;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[pb]
 ;W[kc]C[Black has poor prospects in the fighting ahead.])
 (;B[qb]C[Black 13 is not recommended.]
 ;W[re]
 ;B[rc]
 ;W[pj])))
 (;B[md]C[Black 7 is a mistake.]
 ;W[pc]
 ;B[pd]
 ;W[od]
 ;B[nd]
 ;W[oe]LB[ob:B][pb:A]C['a' or 'b'.]
 (;B[pb]
 ;W[nc]
 ;B[ob]
 ;W[le]
 ;B[ld]
 ;W[kd]
 ;B[kc]
 ;W[me]
 ;B[jd]
 ;W[ke]
 ;B[lc]C[White gains magnificent thickness in sente.])
 (;B[ob]
 ;W[re]LB[qb:B][qc:A][pj:C]C[
 Black plays 'a'. 'b' is a minor mistake. Not playing in the corner, e.g. 'c', is a big mistake.]
 (;B[qc]
 ;W[pj])
 (;B[qb]
 ;W[rc])
 (;B[pj]
 ;W[qb]
 ;B[qc]
 ;W[sd]
 ;B[pb]
 ;W[rc]
 ;B[pc]
 ;W[rb]))))
 (;W[me]LB[mc:a][ne:b]C[Black continues with 'a' or 'b'.]
 (;B[mc]
 ;W[pj]C[
 * Joseki *])
 (;B[ne]
 ;W[nf]
 ;B[nd]
 ;W[mf]LB[ld:a][of:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[ld]
 ;W[md]
 ;B[mc]
 ;W[oe]
 ;B[pd])
 (;B[of]C[Black 11 is unreasonable.]
 ;W[oe]
 ;B[og]
 ;W[qg]
 ;B[pd]
 ;W[ph]
 ;B[oh]
 ;W[oi])))
 (;W[nd]C[White 6 is an overplay.]
 ;B[od]
 ;W[oe]
 ;B[ne]
 ;W[ld]
 ;B[nf]
 ;W[nc]
 ;B[re]
 ;W[qg]
 ;B[lf])
 (;W[od]C[White 6 is ineffective; a bad play.]
 ;B[nc]LB[pc:b][re:a]C[White continues with 'a'. White 'b' is hopeless.]
 (;W[re]
 ;B[pd]C[It is obvious that White 6 served no good purpose.]
 ;W[qi])
 (;W[pc]C[White 8 is a costly mistake.]
 ;B[pd]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[ob]
 ;W[qb]
 ;B[re]
 ;W[rf]C[White 16 is the cap to this unreasonble sequence.]
 ;B[qf]C[White cannot possibly save the situation.])))
 (;B[pd]LB[nd:b][oe:a]C[White 'a' is the traditional continuation, but 'b' is also
 playable.]
 (;W[oe]LB[nd:a][pi:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]LB[qi:a][qj:b]C[White continues with 'a'. White 'b' is too far an extension.]
 (;W[qi]LB[mf:A]C[
 * Joseki *
 A is now a big continuation for both.])
 (;W[qj]C[White 8 is too far an extension. This shows the value of the proverb: "from a wall of two, extend three" and so on.]
 ;B[mf]C[Now Black threatens an invasion...]
 ;W[pg]C[...which White must defend, making White 8 a bad move.]))
 (;B[pi]LB[nc:a][md:b]C[White continues with 'a' or 'b'.]
 (;W[nc]LB[nb:b][od:a]C[Black continues with 'a'. Black 'b' is weak.]
 (;B[od]
 ;W[nd]
 ;B[ne]LB[ob:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[rc]
 ;W[re]LB[nb:b][qb:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qb]
 ;W[nb]
 ;B[ob]
 ;W[ld]
 ;B[nf]
 ;W[og])
 (;B[nb]LB[mb:b][lc:a]C[Black 15 is not recommended.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[lc]LB[qb:a][nf:b]C[Black must play 'a' to live in the corner. Black 'b' is unreasonable.]
 (;B[qb]
 ;W[nf]
 ;B[me]
 ;W[ld]C[White's prospects are good in the fight ahead.])
 (;B[nf]C[Black 17 is a mistake.]
 ;W[qc]
 ;B[pb]
 ;W[rb]
 ;B[ld]
 ;W[mb]
 ;B[kc]
 ;W[na]
 ;B[ob]
 ;W[kb]))
 (;W[mb]C[White 16 is a mistake.]
 ;B[ob]
 ;W[lc]
 ;B[me]LB[ld:a][og:b]C[White may try 'a' or 'b'.]
 (;W[ld]
 ;B[of]C[White will struggle to have his 5 stones live.])
 (;W[og]
 ;B[ld]
 ;W[mc]
 ;B[jc]LB[kc:a][kd:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[kc]
 ;B[jd])
 (;W[kd]
 ;B[ke]
 ;W[jd]
 ;B[kc]
 ;W[ic]
 ;B[ib])))))
 (;W[ob]C[White 12 is a mistake.]
 ;B[pb]
 ;W[nb]
 ;B[re]
 ;W[rf]
 ;B[rd]
 ;W[pg]
 ;B[me]
 ;W[kc]
 ;B[kd]
 ;W[jc]
 ;B[nh]C[Black builds thickness if White struggles to live on the right.]))
 (;B[nb]C[Black 9 is submisive.]
 ;W[od]
 ;B[pb]
 ;W[mc]
 ;B[mb]
 ;W[lc]))
 (;W[md]LB[mb:a][nd:c][ne:b]C[Black continues with 'a'. If Black has the ladder to the lower left, Black may play 'b'. Black 'c' is a mistake.]
 (;B[mb])
 (;B[ne]C[Black must have the ladder to play this way.]
 ;W[nd]
 ;B[od]
 ;W[re]
 ;B[rd]
 ;W[og]
 ;B[nf]
 ;W[ng]
 ;B[le]
 ;W[ld]
 ;B[ke]
 ;W[jc])
 (;B[nd]C[Black 9 is a mistake.]
 ;W[ne]
 ;B[me]
 ;W[ld]
 ;B[mf]
 ;W[rd]
 ;B[rc]
 ;W[qc]LB[pc:a][od:b]C[Black may try 'a' or 'b'.]
 ;B[pc]
 ;W[nc]LB[od:b][re:a]C[Black continues with 'a'. Black 'b' only makes matters worse.]
 (;B[re]
 ;W[od]
 ;B[rf])
 (;B[od]C[Black 19 is a mistake.]
 ;W[qb]
 ;B[re]
 ;W[ob]
 ;B[sd]
 ;W[pb]
 ;B[rd]
 ;W[qg]
 ;B[rf]
 ;W[oh]
 ;B[rg]
 ;W[qh])))))
 (;W[nd]LB[od:b][oe:a]C[Black continues with 'a' or 'b'.]
 (;B[oe]C[Black 7 appeared in a professional game in 1956.]
 ;W[od]
 ;B[of]
 ;W[qg]
 ;B[pg]
 ;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[sd]
 ;W[re]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld]
 ;B[lc]
 ;W[kd]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[pf]
 ;B[oh]
 ;W[kc])
 (;B[od]
 ;W[oe]
 ;B[ne]LB[nc:b][md:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[md]
 ;B[nf]
 ;W[ph]
 ;B[jd])
 (;W[nc]
 ;B[me]
 ;W[lc]
 ;B[re]C[Black secures the corner.]
 ;W[rf]
 ;B[rd]
 ;W[pg]
 ;B[ld]C[Black takes advantage of White's bad shape.])))))
 (;W[pd]C[White 4 is an incredibly vulgar mistake, allowing Black to solidfy corner profit with no compensation.]
 ;B[pc]
 ;W[qe]
 ;B[rd]
 ;W[qi]LB[qg:a]C[The threat of Black 'a' is real.]))
 (;B[pd]LB[oe:a][qe:b]C[
 Diagonal Attachment = Kosumi-Tsuke
 ---------------------------------------
 Black 3 looks strange but can be quite practical.
 White continues at 'a' or 'b'.
+]
 (;W[oe]
 ;B[qe]
 ;W[qf]
 ;B[qd]LB[rf:b][pg:a]C[White continues with 'a' or 'b'.]
 (;W[pg]C[
 * Joseki *]
 ;B[]LB[nc:b][md:a]C[Black plays elsewhere.
 White continues locally with 'a'. White 'b' is unreasonable.]
 (;W[md])
 (;W[nc]C[White 9 is unreasonable.]
 ;B[nb]
 ;W[od]
 ;B[mc]
 ;W[pc]C[White 13 is unreasonable.]
 ;B[ob]C[White has not good follow-up.]))
 (;W[rf]
 ;B[nd]LB[og:A]
 (;W[og]LB[pg:a]C[
 * Joseki *
 White 10 is proper as Black 'a' would spoil White's shape.])
 (;W[]LB[pf:b][pg:a]C[White plays elsewhere.
 Black continues locally with the peep at 'a'. The cut at 'b'
 is not recommended.]
 (;B[pg]
 ;W[pf]C[Now Black can figure out how best to continue.])
 (;B[pf]C[Black 10 is not recommended.]
 ;W[og]C[White settles by sacrificing the two stones.]
 ;B[pg]
 ;W[ph]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[re]
 ;W[of]
 ;B[sf]
 ;W[ni]))))
 (;W[qe]
 ;B[oe]LB[qd:a][of:b]C[White continues with 'a' or 'b'.]
 (;W[qd]LB[qc:a][of:b]C[Black continues with 'a' or 'b'.]
 (;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[of]
 ;B[ne]
 ;W[nf]
 ;B[me]
 ;W[qj]C[
 * Joseki *])
 (;B[of]LB[pb:c][qc:a][qh:b]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[qc]
 ;B[jc])
 (;W[qh]C[White 8 is a mistake.]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[rd]
 ;B[jc])
 (;W[pb]
 ;B[qc]
 ;W[pc]
 ;B[od]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[rf]LB[rd:c][pg:a][dp:b]C[White continues with 'a'. Playing elsewhere ('b') is a mistake.
 Playing 'c' is submissive, but may be okay depending on the right side.]
 (;W[pg]C[White plays 16 to introduce some complication into the situation.]
 ;B[pf]
 ;W[qf]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rd]
 ;B[qi])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[rd]
 ;W[re]
 ;B[pf])
 (;W[rd]C[Black 16 is submissive.]))))
 (;W[of]
 ;B[qd]
 ;W[ne]
 ;B[od]
 ;W[nf]
 ;B[pf]LB[re:b][pg:a]C[White continues with 'a' or 'b'.]
 (;W[pg]
 ;B[qf]
 ;W[re]LB[qg:b][rg:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rg]
 ;W[qg]
 ;B[rf]
 ;W[rh]
 ;B[rd]
 ;W[qi])
 (;B[qg]C[Black 15 is vulgur.]
 ;W[qh]
 ;B[ph]
 ;W[rg]
 ;B[og]
 ;W[rf]
 ;B[pg]
 ;W[qi]))
 (;W[re]LB[qf:b][pg:a]C[White 12 is a move of strong resistance.
 Black continues with 'a', possibly 'b'.]
 (;B[pg]
 ;W[qh]C[The fighting prospects from here are equal.])
 (;B[qf]
 ;W[rg]LB[rf:b][qh:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qh]
 ;W[qg]
 ;B[pg]
 ;W[ph]
 ;B[og]
 ;W[rf]
 ;B[pi]
 ;W[oh]
 ;B[ng]
 ;W[qi]
 ;B[mf])
 (;B[rf]C[Black 15 is a mistake.]
 ;W[pg]))))))
 (;B[qg]LB[qc:b][nd:c][qd:a]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 Black 3 is somewhat an exception. White continues with 'a' to revert to joseki. White 'b' is also possible, but there is trick play potential.
 'c' is also possible.
+]
 (;W[qd]LB[qd:4][pe:2]C[
 * Joseki *
 This gives the same result as when White plays 5 before 2.])
 (;W[qc]LB[lc:A][pd:B][qd:C]C['a' is mild and easy, 'b' leads to several more difficult variations.
 'c' is a mistake.]
 (;B[lc]
 ;W[rf])
 (;B[pd]LB[qd:b][qe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qe]LB[qd:b][oe:a]C[Black continues with 'a'; White takes the corner, Black outside.
 Black 'b' is not as favorable.]
 (;B[oe]LB[of:B][pf:A]C[White continues with 'a'.
 'b' will be cut and running.]
 (;W[pf]
 ;B[qd]
 ;W[rd]LB[rc:b][re:a]C[Black 'a' is better than 'b'.]
 (;B[re]
 ;W[rf]
 ;B[rc]
 ;W[se]
 ;B[qb])
 (;B[rc]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[rf]
 ;W[of]
 ;B[ne]
 ;W[nf]
 ;B[me]
 ;W[mf]
 ;B[le]
 ;W[pi]LB[pb:b][pc:a]C[White can aim for 'a' and 'b' in the endgame, in which case the corner is worth 7 points.]))
 (;W[of]
 ;B[pf]
 ;W[ne]
 ;B[od]
 ;W[qd]LB[md:B][og:A]C['a' is correct, 'b' is possible.]
 (;B[og]
 ;W[nf]
 ;B[lc]
 ;W[ng]C[The fight continues on equal footing.])
 (;B[md]
 ;W[og]
 ;B[qi]LB[nd:A]C[
 The aji of the cut of 'a' is not nice for Black.]
 ;W[nd]
 ;B[nc]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb])))
 (;B[qd]
 ;W[rd]
 ;B[oe]
 ;W[of]LB[rc:b][pf:a]C[Black continues with 'a' for center orientation or 'b' to take the corner.]
 (;B[pf]LB[ne:B][rf:A]C[Black emphasizes thickness.
 'a' or 'b'.]
 (;W[rf]
 ;B[og]
 ;W[nf]
 ;B[ng]
 ;W[mf]
 ;B[qb]
 ;W[pc]
 ;B[od]
 ;W[pb]
 ;B[ob]
 ;W[rb]
 ;B[ld]
 ;W[mg])
 (;W[ne]
 ;B[od]
 ;W[rf]C[White is not bad off. Whatever happens next depends on fighting strength.]))
 (;B[rc]C[Black takes the corner.]
 ;W[re]
 ;B[qb]
 ;W[ne]
 ;B[od]
 ;W[pg]
 ;B[nf]
 ;W[me])))
 (;W[qd]C[White 6 is a mistake.]
 ;B[qe]LB[oe:a][re:b]C[White 'a' is bad enough. White 'b' is worse.]
 (;W[oe]
 ;B[re]LB[ob:b][nc:a]C[White 'a' and the White corner stones die. White 'b' and the two White stones on the outside are left weak.]
 (;W[nc]
 ;B[pc]
 ;W[qb]
 ;B[nb]
 ;W[mc]
 ;B[mb]
 ;W[lc]
 ;B[lb]LB[kc:A][od:B]C['a' is correct. After White 'b' Black may just sacrifice three stones.]
 (;W[kc]
 ;B[kb]
 ;W[jc]C[Black pushing on the second line is good for White, although the result as a whole is still good for Black.]
 ;B[rd])
 (;W[od]
 ;B[pb]
 ;W[pa]
 ;B[ob]
 ;W[kb]
 ;B[rd]
 ;W[rc]
 ;B[ra]))
 (;W[ob]LB[nb:B][od:A]C['a' gives White a secure corner which is shut in and an unsettled center group, 'b' is a mistake and gives White good shape.]
 (;B[od]
 ;W[nb]
 ;B[ne]
 ;W[og]
 ;B[mc]
 ;W[rb]
 ;B[mb])
 (;B[nb]
 ;W[nc]
 ;B[nd]
 ;W[od]
 ;B[mc]
 ;W[pc])))
 (;W[re]
 ;B[qf]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc])))
 (;B[qd]
 ;W[pd]
 ;B[pc]
 ;W[qe]))
 (;W[nd]
 ;B[nc]
 ;W[md]
 ;B[lc]
 ;W[pj]))
 (;B[oe]LB[od:a][pd:c][of:b]C[
 Jump-Attach = Tobi-Tsuke
 ---------------------------
 Black 3 only makes sense, if Black can build a moyo on the top side which is bigger than the corner or right side.
 White may respond with 'a' or 'b'.
 'c' is inferior.
+]
 (;W[od]LB[nd:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[nd]
 ;W[pd]
 ;B[pc]
 ;W[qc]LB[qb:b][mc:a]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[mc]
 ;W[of]
 ;B[ne]
 ;W[rd]C[
 * Joseki *])
 (;B[qb]C[Black 9 is not recommended, as White gets a favorable result.]
 ;W[rd]LB[rb:b][rc:a]C[Black may try 'a' or 'b'.]
 (;B[rc]
 ;W[qd]LB[rb:B][mc:A]C['a' is correct. 'b' is a mistake.]
 (;B[mc]
 ;W[of]
 ;B[ne]
 ;W[rb]
 ;B[ra]
 ;W[sc]C[White need not worry now about the cutting point below White 14.]MA[pf])
 (;B[rb]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[ne]
 ;W[mb]
 ;B[ob]
 ;W[pg]))
 (;B[rb]C[Black 11 show determination, but leads to a tough position for Black.]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[mb]LB[lc:A][ne:B]C['a' or 'b'.]
 (;W[lc]
 ;B[ne]
 ;W[pg]
 ;B[le]
 ;W[jc]C[Black's stones in the center are floating. White faces favorable prospects by making profit by threatening the Black center stones.])
 (;W[ne]
 ;B[md]
 ;W[of]
 ;B[lc]))))
 (;B[pd]
 ;W[nd]LB[nc:c][pc:a][qd:b][pf:d]C[Black continues with 'a'. Black 'b' to 'd' are not recommended.]
 (;B[pc]LB[qe:b][of:a]C[White continues with 'a' or 'b'. White must have the ladder to play 'a'.]
 (;W[of]C[White must have the ladder to play 8.]
 ;B[qe]
 ;W[ne]
 ;B[qf]
 ;W[nc])
 (;W[qe]
 ;B[of]
 ;W[nc]LB[rc:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[qh]
 ;B[kd]
 ;W[le])
 (;B[qg]
 ;W[rc]
 ;B[rb]
 ;W[rg]LB[qh:A][rh:B]C['a' is correct. 'b' is a mistake.]
 (;B[qh]
 ;W[rd]
 ;B[nb]
 ;W[mb]
 ;B[oa]
 ;W[ld]
 ;B[sb]
 ;W[rh]
 ;B[ri]
 ;W[qf]
 ;B[qi]
 ;W[sf]
 ;B[oh]
 ;W[ic])
 (;B[rh]
 ;W[re]LB[qb:B][qh:A]C[Neither 'a' nor 'b' work.]
 (;B[qh]
 ;W[qb])
 (;B[qb]
 ;W[qh])))))
 (;B[qd]C[Black 7 may look like good shape, but is a slack move here.]
 ;W[nc]LB[pb:b][pf:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pf]
 ;W[ne]
 ;B[of]
 ;W[pc]
 ;B[qc]
 ;W[ob])
 (;B[pb]C[Black 9 is not recommended.]
 ;W[ob]
 ;B[pc]
 ;W[pf]
 ;B[ne]
 ;W[ld]
 ;B[me]
 ;W[kd]))
 (;B[nc]LB[md:B][of:A]C[Black 7 looks tough, but Black faces difficulties.
 'a' is correct. 'b' is a mistake.]
 (;W[of]
 ;B[ne]
 ;W[md]
 ;B[me]LB[qd:a][le:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qd]
 ;B[pc]
 ;W[ld]LB[qc:b][qe:a]C[Black may try 'a' or 'b'.]
 (;B[qe]
 ;W[pf]
 ;B[re]
 ;W[lf]C[The three Black stones are captured, a success for White.])
 (;B[qc]
 ;W[pf]C[Black must decide what to do about the three stones in the center. White has favorable propects.]))
 (;W[le]C[White 12 is not recommended.]
 ;B[ng]
 ;W[pc]
 ;B[qd]
 ;W[qc]
 ;B[rc]
 ;W[rd]
 ;B[qe]
 ;W[rb]
 ;B[ld]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[ob]
 ;B[pf]C[Black's thickness is better than White's corner profit.]))
 (;W[md]
 ;B[qd]
 ;W[of]
 ;B[qe]
 ;W[ne]
 ;B[pg]))
 (;B[pf]
 ;W[qe]
 ;B[qd]
 ;W[qf]
 ;B[of]
 ;W[nc]
 ;B[pb]
 ;W[ob]
 ;B[pc]
 ;W[qh])))
 (;W[of]LB[ne:a][pf:b]C[Black continues with 'a' or 'b'. Black must have the ladder to play 'b'.]
 (;B[ne]
 ;W[pd]LB[pc:B][pf:A]C['a' is joseki, 'b' is ok.]
 (;B[pf]LB[pc:b][qf:a][pg:c]C[White continues with 'a'. White 'b' is bad timing. Black 'c' is unreasonable.]
 (;W[qf]C[White plays 8 to take the corner.]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]LB[pc:a][qi:b]C[White continues with 'a'. White 'b', hoping to cut off Black
 next, is unreasonable.]
 (;W[pc]LB[ob:b][qi:a]C[Black continues with 'a' for the right, 'b' for the top side.]
 (;B[qi]
 ;W[nb]LB[ob:a][od:b]C[White 16 is a tesuji - if Black 'a', White 'b' is good.])
 (;B[ob]
 ;W[qj]
 ;B[ic]C[
 * Joseki *]))
 (;W[qi]
 ;B[pj]
 ;W[od]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[ob]
 ;W[mb]
 ;B[qc]LB[lc:b][rd:a]C[White plays 'a' and give Black magnificant thickness. White plays 'b' and Black lives in the corner.]
 (;W[rd]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[rc]
 ;B[kb]
 ;W[pc]
 ;B[qj]C[Black has beautiful thickness.])
 (;W[lc]
 ;B[rd]
 ;W[re]
 ;B[qj]
 ;W[rj]
 ;B[rk]
 ;W[si]
 ;B[le]
 ;W[ic]LB[se:a][dp:b]C[Black plays 'a' to live comfortably in the corner. Not playing 'a', such as playing elsewhere ('b'), jeopordizes the corner.]
 (;B[se]
 ;W[sf]
 ;B[sd]
 ;W[rg]C[White ends in gote.])
 (;B[]C[Black plays elsewhere. Not recommended, but not fatal.]
 ;W[md]
 ;B[me]
 ;W[rb]C[The placement of White 35 is the tesuji.]
 ;B[qb]
 ;W[oa]
 ;B[pa]
 ;W[rc]
 ;B[qd]
 ;W[qe]
 ;B[ra]C[Black has to capture the two White stones...]
 ;W[pc]LB[pb:b][sb:a]C[...allowing White to capture two Black stones ('a'). White cannot connect at 'b'.]
 (;B[sb]
 ;W[pb])
 (;B[pb]C[Black cannot connect.]
 ;W[sd]C[Atari, and the game is over.])))))
 (;W[pc]LB[qf:a][og:b]C[White 8 is not recommended.
 Black continues with 'a', or, with a favorable ladder, 'b'.]
 (;B[qf]
 ;W[og]
 ;B[ph]
 ;W[nb]
 ;B[mf]
 ;W[oh]
 ;B[pi]
 ;W[nc]
 ;B[mh])
 (;B[og]C[Black plays 3 with a favorable ladder.]
 ;W[qf]
 ;B[nf]
 ;W[qg]
 ;B[ob]))
 (;W[pg]C[White 8 is unreasonable. White cannot capture the Black stone.]
 ;B[qf]
 ;W[qg]
 ;B[re]C[Black 11 is a standard tesuji enabling him to capture the two White stones.]
 ;W[rg]
 ;B[rd]LB[pc:a][qc:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[pc]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[nc]C[If White tries 18...]
 ;B[mc]C[... Black keeps the situation in check with 19.])
 (;W[qc]
 ;B[pc]
 ;W[qd]
 ;B[rc]LB[qb:b][rb:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[rb]
 ;B[qb]C[Black 19 starts a common squeeze tesuji.]
 ;W[pb]
 ;B[qa]
 ;W[pa]
 ;B[qe]
 ;W[ra]
 ;B[qb]
 ;W[qa]
 ;B[od]
 ;W[qb]
 ;B[sb]C[White has lost.])
 (;W[qb]
 ;B[rb]))))
 (;B[pc]LB[qc:B][pi:A]C['a' for the center, 'b' for the corner.]
 (;W[pi]
 ;B[dp]C[Possible White continuation later.]
 ;W[qc]LB[qb:B][mc:A]C['a' is ok, 'b' is possible.]
 (;B[mc]
 ;W[qb])
 (;B[qb]C[
 If you know the follow-up, please email: kogo@waterfire.us.]
 ;W[od]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[qd]
 ;W[rc]
 ;B[pf]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[mb]LB[pb:B][og:A]C['a' takes the right side, 'b' the corner.]
 (;W[og]
 ;B[ob])
 (;W[pb]
 ;B[og]
 ;W[rf]
 ;B[qh])))
 (;W[qc]
 ;B[pf])))
 (;B[pf]LB[od:b][qd:c][qe:a]C[Black must have the ladder to play 5. White continues with 'a' or 'b'. White 'c' results in a loss.]
 (;W[qe]LB[ne:a][qf:b]C[Black continues with 'a' or 'b'.]
 (;B[ne]
 ;W[pg]
 ;B[nf]
 ;W[og]
 ;B[qc]
 ;W[qj]C[
 * Joseki *])
 (;B[qf]LB[od:b][rf:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[rf]LB[og:A][rg:B]C['a' is correct, 'b' is disadvantageous.]
 (;B[og]
 ;W[nf]LB[pc:1][oe:5][pe:4][qe:2][nf:10][of:6][pf:3][qf:7][rf:8][og:9]TR[oc]C[There is a similar position starting with 1 instead of the marked stone, refererenced by the numbers.
+]
 ;B[ne]LB[ng:a][qh:b]C[With an unfavorable ladder, White must play 'a'. But if the ladder favors White, White plays 'b'.]
 (;W[ng]C[White plays this way when the ladder is unfavorable.]
 ;B[rg]
 ;W[re]
 ;B[qg]LB[pb:a][oh:b]C[White continues with 'a' or 'b'.]
 (;W[pb]LB[pc:a][nh:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[qc]
 ;B[ob]
 ;W[oh]LB[qb:b][qj:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qj]
 ;W[qb]
 ;B[le]C[
 * Joseki *])
 (;B[qb]C[Black cannot afford to play 21. Black loses the race to capture by a move.]
 ;W[rb]
 ;B[pa]
 ;W[qi]
 ;B[ri]
 ;W[rj]
 ;B[rh]
 ;W[qk]LB[rc:b][qd:a]C[Black may try 'a' or 'b', but loses the race to capture.]
 (;B[qd]
 ;W[rc])
 (;B[rc]
 ;W[qh])))
 (;B[nh]LB[lf:A][lg:B]C['a' or 'b'.]
 (;W[lf]
 ;B[pc]
 ;W[qc]
 ;B[ob]
 ;W[qb]
 ;B[ld]
 ;W[lh]
 ;B[oi])
 (;W[lg]
 ;B[oi]
 ;W[ob]
 ;B[me]
 ;W[lf]
 ;B[kd])))
 (;W[oh]
 ;B[qc]
 ;W[qi]
 ;B[ri]
 ;W[rj]
 ;B[rh]
 ;W[qk]
 ;B[rd]
 ;W[me]))
 (;W[qh]C[White plays 12 if the ladder to capture the two White center stones does not work for Black.]
 ;B[pg]
 ;W[rd]
 ;B[oi]
 ;W[mf]
 ;B[ld]
 ;W[qj]C[White has favorable position.]))
 (;B[rg]
 ;W[re]
 ;B[ph]
 ;W[od]
 ;B[ne]
 ;W[nd]
 ;B[md]
 ;W[me]
 ;B[nf]
 ;W[nc]
 ;B[mc]
 ;W[pc]
 ;B[og]
 ;W[le]
 ;B[kc]
 ;W[kd]
 ;B[lb]
 ;W[jc]
 ;B[jb]
 ;W[ic]
 ;B[ib]
 ;W[hc]))
 (;W[od]C[White 8 is unreasonable.]
 ;B[ne]
 ;W[nd]
 ;B[pd]
 ;W[qd]
 ;B[pc]
 ;W[md]
 ;B[me]
 ;W[qc]
 ;B[qb]
 ;W[rb]LB[ob:b][ld:a]C[Black plays simply with 'a', or tenaciously with 'b'.]
 (;B[ld]
 ;W[nb]
 ;B[og]
 ;W[lb]
 ;B[re]
 ;W[rd]
 ;B[sd]
 ;W[rc]
 ;B[rg]LB[pb:a][dp:b]C[White has to add a corner move, such as 'a'. Playing elsewhere risks a ko.]
 (;W[pb])
 (;W[]C[White plays elsewhere. Black gets a flower-viewing ko (a ko where Black has nothing to lose).]
 ;B[ra]
 ;W[pb]
 ;B[sb]))
 (;B[ob]C[Black 19 is tough-minded, going for a big ko fight.]
 ;W[le]
 ;B[og]
 ;W[qa]
 ;B[pa]
 ;W[pb]
 ;B[ld]
 ;W[lc]
 ;B[kd]
 ;W[mc]
 ;B[qb]
 ;W[ra]
 ;B[kc]
 ;W[pb]C[The fight continues...]))))
 (;W[od]C[White 6 is vulgar, but playable.]
 ;B[ne]
 ;W[pd]
 ;B[nd]LB[nc:a][pc:b]C[White continues with 'a'. White 'b' is also playable if White
 does not mind giving Black good outside influence.]
 (;W[nc]LB[mc:b][pc:a]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[qc]
 ;B[qb]
 ;W[rd]
 ;B[nb]
 ;W[mc]LB[mb:A][rb:B]C['a' gives an equal result, 'b' is disadvantageous.]
 (;B[mb]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;W[lc]
 ;B[rb]
 ;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]LB[mb:23][nb:21][qb:19][rb:25][lc:24][mc:22][nc:18][oc:7][pc:1][qc:8][nd:17][od:16][pd:6][rd:20][ne:5][oe:3][pe:2][of:4][pf:9][qf:10][pg:11][qg:12][ph:13][qh:14][pi:15]C[Same result as the variation refererenced by the numbers, look
 there (flipped by the ascending diagonal line) for the continuation.])
 (;B[rb]
 ;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]
 ;W[mb]
 ;B[ob]C[See variation 2-4-4-1-2-1-1-1-1-1 for continuation.]))
 (;B[mc]
 ;W[nb]LB[ob:a][qf:b]C[Black continues with the tough-minded move of 'a', or the simpler 'b'.]
 (;B[ob]
 ;W[mb]
 ;B[qc]
 ;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]LB[lc:C][rd:A][qh:B]C['a' is correct, if White wants to take less territory for giving less influence than after 'b', 'b' is ok, 'c' is wrong.]
 (;W[rd]
 ;B[lc]
 ;W[lb]
 ;B[kc]
 ;W[rc]
 ;B[kb]
 ;W[pc]
 ;B[qh])
 (;W[qh]C[If you know the follow-up, please email: kogo@waterfire.us.]
 ;B[pi]
 ;W[qi]
 ;B[pj]LB[mb:22][nb:20][ob:21][mc:19][nc:18][oc:1][qc:23][nd:17][od:16][pd:6][ne:5][oe:3][pe:2][of:4][pf:7][qf:8][pg:9][qg:10][ph:11][qh:12][pi:13][qi:14][pj:15]C[For continuation see the variation referenced by the numbers.])
 (;W[lc]
 ;B[rd]
 ;W[re]
 ;B[qh]C[White dies.]))
 (;B[qf]
 ;W[ob]
 ;B[og]C[Black's ponnuki shape from capturing White 4 gives Black a very favorable result.])))
 (;W[pc]LB[nc:b][qf:a]C[Locally, White 10 is not recommended, but is okay if the resulting Black outside influence does not count for much.
 Depending on the side of favor, Black continues with 'a' or 'b'.]
 (;B[qf]
 ;W[nc]
 ;B[mc]
 ;W[ob]
 ;B[og]
 ;W[mb]LB[lc:a][nf:b]C[Black continues with 'a' or 'b'.]
 (;B[lc])
 (;B[nf]))
 (;B[nc]LB[qf:a][pg:b]C[White continues with 'a'. White 'b' loses the game.]
 (;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]
 ;W[qj]
 ;B[id])
 (;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[re]
 ;W[rg]
 ;B[qc]
 ;W[qb]
 ;B[pb]
 ;W[ob]
 ;B[pa]
 ;W[oa]
 ;B[qd]
 ;W[qa]
 ;B[pb]
 ;W[pa]
 ;B[qe]
 ;W[pb]
 ;B[nf]
 ;W[og]
 ;B[rb]
 ;W[rc]
 ;B[sb]
 ;W[mb]
 ;B[nb]
 ;W[na]
 ;B[lb]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[la]
 ;W[ma]
 ;B[le]))))
 (;W[qd]C[White cannot get a favorable result.]
 ;B[ne]LB[qf:a][og:c][pg:b]C[White continues with 'a'. White 'b' and 'c' are no good.]
 (;W[qf]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]
 ;W[qj]
 ;B[ic])
 (;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[re]LB[rd:b][rf:a]C[White continues with 'a'. White 'b is a mistake.]
 (;W[rf]
 ;B[qe]
 ;W[rd]
 ;B[pd]
 ;W[se]
 ;B[pe]
 ;W[rh]
 ;B[qc])
 (;W[rd]C[White 12 is a mistake.]
 ;B[rg]C[White is at a loss, with too many cutting points to succeed.]))
 (;W[og]
 ;B[qf]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[nb]
 ;W[pa]
 ;B[ob]
 ;W[rc]
 ;B[qi]))))
 (;W[pd]
 ;B[od]
 ;W[pc]
 ;B[pf]
 ;W[qf]
 ;B[qg]))
 (;B[qc]C[
 -3 = Sansan
 -------
 Black 3 is too low.
+]
 ;W[qd]LB[rc:a][rd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[rc]LB[nd:c][ne:b][qi:a]C[White continues with 'a' or 'b'.
 White 'c', attempting to press Black down before extending at 'a', is a mistake.]
 (;W[qi]LB[oe:a][dp:b]C[
 * Joseki *
 Black continues with 'a'. Playing elsewhere ('b') is not recommended.]
 (;B[oe]
 ;W[of]
 ;B[ne]
 ;W[pc]
 ;B[pb]
 ;W[pd]
 ;B[nb])
 (;B[]C[Black plays elsewhere.]
 ;W[nd]LB[nc:a][od:b]C[White presses.
 Black continues with 'a'. White 'b' is unreasonably strong resistance.]
 (;B[nc]
 ;W[md]
 ;B[lc])
 (;B[od]C[White 8 is unreasonable.]
 ;W[oe]
 ;B[ne]
 ;W[ld]
 ;B[nf]
 ;W[nc])))
 (;W[ne]LB[md:A][qi:B]C['a' is joseki, 'b' is possible.]
 (;B[md]LB[me:B][qj:A]C['a' is joseki, 'b' unneceassarily gives Black much territory.]
 (;W[qj]C[
 * Joseki *])
 (;W[me]
 ;B[ld]
 ;W[le]
 ;B[kd]
 ;W[qk]
 ;B[jf]))
 (;B[qi]
 ;W[nc]
 ;B[nb]
 ;W[od]
 ;B[pc]
 ;W[mc]
 ;B[mb]
 ;W[lc]))
 (;W[nd]LB[nc:B][od:A]C[White 6 is a mistake.
 'a' is correct, 'b' is too submissive.]
 (;B[od]
 ;W[oe]
 ;B[ne]
 ;W[ld]LB[me:A][nf:B]C['a' or 'b'.]
 (;B[me]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[kc]
 ;B[og]
 ;W[qg]
 ;B[pi])
 (;B[nf]
 ;W[nc]
 ;B[nb]
 ;W[pg]
 ;B[mb]
 ;W[lc]
 ;B[lf]))
 (;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld])))
 (;B[rd]C[Black 5 is a coarse move.]
 ;W[re]
 ;B[pd]
 ;W[qe]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[nf]
 ;B[me]
 ;W[rc]
 ;B[rb]
 ;W[sd]))
 (;B[qh]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 If you know the follow-up, please email: kogo@waterfire.us.
 ]))
 (;W[qc]LB[pd:c][qd:b][pe:a][qe:d][pf:f][qf:e]C[
 San-san
 --------
 White goes for profit at the expense of influence. A ladder helps White when playing 2.
 Black replies with 'a' to 'f'. Black must have the ladder to sucessfully play 'b'.
 e5, d4, c 3, b2, a1
+]
 (;B[pe]LB[ob:c][qe:a][re:b]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 White continues with 'a' or 'b'. White 'c' is a mistake.
+]
 (;W[qe]LB[pf:b][qf:a]C[Black continues with 'a' or 'b'.]
 (;B[qf]LB[ob:b][pd:c][qd:e][re:d][pf:a]C[White continues with 'a', 'b' or 'c'.
 White 'a' emphasizes the corner, with aji from 'a'.
 White 'a' may lead to complications.
 White 'b' emphasizes the top.
 White 'c' emphasizes the right.
 White 'd' and 'e' are not recommended.]
 (;W[pf]LB[pd:c][qd:a][oe:b]C[Black 'a' is the usual continuation.'b' is possible with the ladder. Black 'c' was played by Hashimoto Utaro against Sakata Eio in 1972.]
 (;B[qd]
 ;W[re]LB[pd:b][oe:a]C[Black continues with 'a' or 'b'.]
 (;B[oe]
 ;W[rd]
 ;B[pg])
 (;B[pd]
 ;W[rd]
 ;B[qg]
 ;W[pc]LB[ob:b][od:a]C[Joseki continues with 'a'. Black 'b' is a mistake.]
 (;B[od]
 ;W[of]
 ;B[pi]
 ;W[mf]
 ;B[ob]
 ;W[rb]
 ;B[ld]C[
 * Joseki *]
 ;W[ni]
 ;B[pk])
 (;B[ob]LB[od:b][ph:a]C[Black 13 is a mistake discovered by Yoshio Ishida in 1997 against Iwata. Ishida called the move "complacent".
 White continues with 'a' or 'b'. Black had expected 'b', but got 'a'.]
 (;W[ph]
 ;B[qh]
 ;W[qi]
 ;B[pg]
 ;W[of]
 ;B[ne]
 ;W[og]
 ;B[ri]
 ;W[pi]
 ;B[rj]
 ;W[rf]
 ;B[rh]
 ;W[rb]
 ;B[ql]C[Black 27 is questionable....]
 ;W[le]C[... because White 28 is such a severe attack. Black faces a difficult fight.])
 (;W[od]
 ;B[oe]C[Black builds thickness while White takes the top.]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[le]LB[mb:a][kd:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mb]
 ;B[kd]
 ;W[kc]
 ;B[jc]
 ;W[kb]
 ;B[jd])
 (;W[kd]C[White 22 is a mistake.]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[sc]
 ;B[pb]
 ;W[rc]
 ;B[mb]
 ;W[lb]
 ;B[ra])))))
 (;B[oe]
 ;W[qg]
 ;B[rf]
 ;W[re]
 ;B[rg]
 ;W[qh]
 ;B[pg]
 ;W[of]
 ;B[ph]
 ;W[rh]
 ;B[nf])
 (;B[pd]LB[qd:a][qg:b]C[White 'a' is the continuation of the game (Hashimoto v. Sakata, 1972). White 'b' also leads to an even exchange.]
 (;W[qd]
 ;B[rf]
 ;W[of]
 ;B[qh]LB[ob:b][nd:a]C[White 'a' shows the game continuation. White 'b' strengthens the black stones on the outside.]
 (;W[nd]
 ;B[nc]LB[ld:a][md:b]C[White continues with 'a' or 'b'. White 'a' keeps the corner alive, while 'b' sacrifices the corner for thickness at top.]
 (;W[ld]
 ;B[lc]
 ;W[kc]LB[mc:a][md:b]C[Black continues with 'a' or 'b'.
 Black 'a' gets Black out to the center (White lives in the corner).
 Black 'b' gets Black sealed in, but taking the taking the large
 corner territory.]
 (;B[mc]C[Black 17 gets black out to the center, but White lives in the corner.]
 ;W[kd]
 ;B[re]
 ;W[pc]
 ;B[od]
 ;W[ob]
 ;B[ne]
 ;W[rd]
 ;B[nb]
 ;W[pa]
 ;B[md]
 ;W[oh]
 ;B[ng]
 ;W[nf]
 ;B[mf]
 ;W[mg]
 ;B[lf]
 ;W[mh])
 (;B[md]C[Black 17 results in White sealing Black in, but Black takes the corner.]
 ;W[me]
 ;B[mc]
 ;W[kd]
 ;B[ne]
 ;W[nf]
 ;B[pb]
 ;W[qb]
 ;B[re]))
 (;W[md]C[White 14 discards the corner for thickness.]
 ;B[mc]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[jb]
 ;W[ic]))
 (;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nd]))
 (;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[of]
 ;W[pg]
 ;B[qd]
 ;W[re]
 ;B[rd]
 ;W[sf]C[White still has aji in the corner.])))
 (;W[ob]LB[nb:a][pc:c][qd:b]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
 (;B[nb]
 ;W[nc]
 ;B[od]LB[mb:a][pb:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[mb]
 ;B[pb]
 ;W[na]
 ;B[pc]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[nf]C[The two White stones in the corner are not captured yet.]
 ;W[qb]C[White can get a ko.]
 ;B[pa]
 ;W[re]
 ;B[rf]LB[sb:b][qd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qd]C[White 22 is the best move.]
 ;B[qa]
 ;W[ra]
 ;B[rb]
 ;W[sb])
 (;W[sb]C[White 22 is a mistake. White dies.]
 ;B[ra]
 ;W[qa]
 ;B[se]C[Now White cannot make two eyes.]))
 (;W[pb]C[White 10 is a mistake.]
 ;B[mc]
 ;W[nd]
 ;B[lb]LB[ne:b][re:a]C[White has to play 'a' to live in the corner. White cannot extend
 with 'b'.]
 (;W[re]C[White has to play 14 to live.]
 ;B[me])
 (;W[ne]C[White 14 is a mistake.]
 ;B[qd]
 ;W[re]
 ;B[rd]
 ;W[pd]
 ;B[pc]
 ;W[oe]
 ;B[pd]
 ;W[rc]
 ;B[rf]
 ;W[ra]
 ;B[oa])))
 (;B[qd]
 ;W[pc]
 ;B[re]
 ;W[nc]C[
 * Joseki *])
 (;B[pc]C[Black 7 is a mistake.]
 ;W[qd]
 ;B[pb]
 ;W[pf]
 ;B[pd]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[of]
 ;W[pg]))
 (;W[pd]
 ;B[od]
 ;W[rf]
 ;B[pf]
 ;W[rg]
 ;B[qb]
 ;W[rb]
 ;B[rd]
 ;W[qd]
 ;B[pb]
 ;W[rc])
 (;W[re]C[White 6 is a heavy move, and not recommended.]
 ;B[pf]
 ;W[ob]
 ;B[nb]LB[pb:a][nc:b]C[White draws back at 'a'. White 'b' is a mistake.]
 (;W[pb]
 ;B[mc]C[White has sente, but a small corner. Black's thickness is better.])
 (;W[nc]C[White 10 is a mistake.]
 ;B[od]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[qb]
 ;W[nd]
 ;B[ne]
 ;W[me]
 ;B[nf]))
 (;W[qd]C[White 6 is a heavy move, and not recommended.]
 ;B[pf]
 ;W[ob]LB[nb:b][nc:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nc]
 ;W[nb]
 ;B[pb]
 ;W[pc]
 ;B[mb]
 ;W[qb]
 ;B[mc])
 (;B[nb]C[Black 9 is a mistake.]
 ;W[nc]C[Black now lacks a good response.])))
 (;B[pf]LB[ob:b][qf:a]C[White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pg]LB[ob:b][qg:a]C[If White has followed this line, it is correct to continue at 'a'. White 'b' is a mistake in move order.]
 (;W[qg]
 ;B[ph]
 ;W[jc]C[
 * Joseki *]
 ;B[qh])
 (;W[ob]C[White 8 is a mistake in move order.]
 ;B[qd]LB[pd:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]
 ;B[pd]C[Black has now created the two marked cutting points. White is in trouble.]MA[pb][rc])
 (;W[pd]C[White 10 is a mistake.]
 ;B[rd]
 ;W[pc]
 ;B[rc]
 ;W[od]
 ;B[qg])))
 (;W[ob]LB[nb:b][pb:c][nc:a]C[Black continues with 'a'. Black 'b' and 'c' are mistake.]
 (;B[nc]
 ;W[qf]
 ;B[pg]
 ;W[nb]
 ;B[mc]
 ;W[pd]
 ;B[od]
 ;W[pc]C[
 * Joseki *])
 (;B[nb]C[Black 7 is a mistake.]
 ;W[nc]
 ;B[od]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[pc]
 ;W[kd]
 ;B[qf]LB[qb:a]C[The sequence ends in gote for Black.
 White can get a ko in the corner with 'a'.]
 ;W[qb]
 ;B[pa]
 ;W[re]
 ;B[rf]
 ;W[qd]
 ;B[qa]
 ;W[ra]
 ;B[rb]
 ;W[sb])
 (;B[pb]
 ;W[pc]
 ;B[nb]
 ;W[od]
 ;B[nc]
 ;W[pd]))))
 (;W[re]LB[qb:a][qf:b][rf:c]C[Black continues with 'a' or 'b'. Black 'c' is an overplay.]
 (;B[qb]LB[pb:a][rb:b]C[White continues with 'a'. White 'b' is not good.]
 (;W[pb]
 ;B[pc]
 ;W[rb]
 ;B[qd]
 ;W[rc]
 ;B[ob]
 ;W[qa]
 ;B[kd]C[
 * Joseki *])
 (;W[rb]LB[pb:a][qd:b]C[White 6 is not recommended: White is too low.
 Black continues with 'a' or 'b'.]
 (;B[pb]
 ;W[qg]
 ;B[kc])
 (;B[qd]LB[pb:b][rd:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rd]
 ;B[pc]
 ;W[rc]
 ;B[kc])
 (;W[pb]C[White 8 is not recommended.]
 ;B[pc]
 ;W[rc]
 ;B[ob]
 ;W[qa]))))
 (;B[qf]
 ;W[rf]
 ;B[qg]
 ;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc])
 (;B[rf]C[Black 5 is an overplay.]
 ;W[qf]
 ;B[qe]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[qd]
 ;W[pf]LB[oe:a][of:b]C[Black 'a' is submissive, but Black 'b' leaves aji for White 2.]))
 (;W[ob]C[White 'c' is a mistake.]
 ;B[nb]LB[pb:a][nc:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[pb]
 ;B[nc]
 ;W[re]
 ;B[rf]LB[nb:5][ob:4][pb:6][nc:7]C[Black 9 works here: White cannot afford to sacrifice the corner stones now.
 Compare this to the variation, where the exchanges of White 4, Black 5, White 6, Black 7 have been omitted.]
 ;W[rd]
 ;B[qf]C[Now Black has great thickness.])
 (;W[nc]LB[nd:a][od:b]C[Black continues with 'a'. Black 'b' is slack.]
 (;B[nd]
 ;W[mc]
 ;B[pb]
 ;W[od]
 ;B[pc]
 ;W[pd]
 ;B[qd]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[qe]
 ;W[mb]
 ;B[oa])
 (;B[od]C[Black 7 is a slack move.]
 ;W[mb]
 ;B[pb]
 ;W[na]C[Now Black must confine White 2, while White gets a nice extension
 on the side.]
 ;B[pc]))))
 (;B[qd]LB[pc:b][rd:a]C[
 Attach on top to draw back = Uezuke-Hiki
 --------------------------------------------
 Black must have the ladder to play this way.
 White continues with 'a'. White 'b' is not recommended.
+]
 (;W[rd]LB[pd:a][qe:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]LB[qe:a][re:b]C[White continues with 'a' or 'b'. White should play 'a' if the ladder to the bottom left is favorable to White.
 White 'b' does not involve a ladder.]
 (;W[qe]LB[rc:a][re:b]C[Black continues with 'a' with a favorable ladder, or 'b' if the ladder is unfavorable.]
 (;B[rc]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[qf])
 (;B[re]C[Black must play this way with an unfavorable ladder, though the result favors White.]
 ;W[rf]LB[rc:A][pe:B]C['a' or 'b'.]
 (;B[rc]
 ;W[se]
 ;B[qb]LB[pe:B][qh:A]C[Black's corner is small, and White's ponnuki shape powerful.
 'a' or 'b'.]
 (;W[qh])
 (;W[pe]))
 (;B[pe]LB[se:A][qf:B]C['a' is correct. 'b' is a mistake.]
 (;W[se]
 ;B[qf]
 ;W[qg]
 ;B[re]
 ;W[rh]
 ;B[pf]
 ;W[rb])
 (;W[qf]
 ;B[rc]
 ;W[se]
 ;B[qb]))))
 (;W[re]
 ;B[qb]
 ;W[rc]
 ;B[pc]
 ;W[pf]
 ;B[lc]))
 (;B[qe]
 ;W[pc]
 ;B[od]
 ;W[re]
 ;B[qg]LB[pd:b][rf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rf]
 ;B[og])
 (;W[pd]C[White 10 is not recommended.]
 ;B[pe]
 ;W[oe]
 ;B[pg]
 ;W[ne]
 ;B[ob]
 ;W[rb]
 ;B[lc]C[White faces a difficult fight.])))
 (;W[pc]C[White 4 is not recommended.]
 ;B[pd]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]C[Black's thickness is superior.]))
 (;B[pd]LB[qd:b][qe:a][re:c]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
 Black 3 is playable only in this situation. This shape is a bit vulgar, and so is not seen in other joseki.
 Black should have a favorable ladder to play this way.
 White continues with 'a'. White 'b' and 'c' are mistakes.
+]
 (;W[qe]LB[qd:A][pf:B]C[White 4 is the only good move.
 'a' or 'b'.]
 (;B[qd]
 ;W[rd])
 (;B[pf]
 ;W[qd]
 ;B[nf]
 ;W[qg]))
 (;W[qd]C[White 'b' is a mistake.]
 ;B[qe]LB[pe:b][re:a]C[White must now submit to playing 'a'. A cut at 'b', starting a fight, is unreasonable.]
 (;W[re]
 ;B[qf]
 ;W[rf]
 ;B[qg])
 (;W[pe]C[White 6 is unreasonable without more support.]
 ;B[re]LB[ob:B][oe:A]C[Neither 'a' nor 'b' work.]
 (;W[oe]
 ;B[pc]CR[kd]C[Black captures the corner stones.
 Without support for White at the marked location, this fight is unreasonable.])
 (;W[ob]
 ;B[nb]
 ;W[pb]
 ;B[nc]
 ;W[rb]
 ;B[qg])))
 (;W[re]C[White 4 is a mistake.]
 ;B[qe]LB[rd:a][qf:c][rf:b]C[White continues with 'a'. White cannot play 'b'.]
 (;W[rd]C[White must back up to connect.]
 ;B[qf])
 (;W[rf]C[White 6 is a mistake.]
 ;B[rd]
 ;W[qd]
 ;B[rc])
 (;W[qf]C[Assuming Black has the ladder, White 6 is a mistake.]
 ;B[rd]
 ;W[qd]
 ;B[pe]LB[rc:a][rf:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[qg])
 (;W[rf]C[White 10 compounds the mistake.]
 ;B[rc]C[White suffers a big loss.]))))
 (;B[qe]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 As the 3-3 point is easily settled, there must be some strategic advantage in attacking it with the pincer, namely, surrounding support. By itself, the pincer is somewhat unreasonable.
+]
 ;W[pd]LB[oe:B][pf:A]C['a' is correct, 'b' is a trick play.]
 (;B[pf]LB[od:a][pe:b]C[White continues with 'a' or 'b'.]
 (;W[od]LB[mc:a][nc:b]TR[jd]C[Black continues with 'a'. Black 'b' is only good with a stone on or near the marked position.]
 (;B[mc]LB[nc:b][nd:a]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[nc]
 ;W[nf]LB[rb:c][jc:a][pi:b]C[Pincers at 'a' and 'b' are miai for White, so Black should have had support before initiating this pincer.
 A Black placement at 'c' can deprive White of getting an eye in the corner.])
 (;W[nc]C[warikomi (thrust in)]
 ;B[nd]
 ;W[nb]
 ;B[md]
 ;W[ob]
 ;B[nf]))
 (;AB[jd]
 ;B[nc]LB[nd:A][of:B]C['a' or 'b'.]
 (;W[nd]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[nf]
 ;B[pi])
 (;W[of]LB[og:A][ph:B]C['a' or 'b'.]
 (;B[og]
 ;W[pg]LB[nd:A]C[White 'a' remains sente.])
 (;B[ph]
 ;W[md]))))
 (;W[pe]LB[of:B][qf:A]C['a' or 'b'.]
 (;B[qf]LB[nd:b][ne:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ne]
 ;B[md]
 ;W[of]
 ;B[ph])
 (;W[nd]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[ld]
 ;B[kc]CR[nf]C[A Black jump to the marked location is sente, so White has not really built thickness.]))
 (;B[of]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[re])))
 (;B[oe]
 ;W[pe]
 ;B[pf]
 ;W[od]
 ;B[nd]LB[of:B][qf:A]C['a' is correct, 'b' is getting tricked.]
 (;W[qf]
 ;B[of]
 ;W[qg])
 (;W[of]
 ;B[ne]
 ;W[qf]
 ;B[pg])))
 (;B[qf]LB[od:c][pd:b][qe:a]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 White continues with 'a' or 'b'.
 White 'c' is a mistake.
+]
 (;W[qe]LB[pe:a][pf:b]C[Black continues with 'a', possibly 'b'.]
 (;B[pe]LB[ob:b][pf:a]C[From here White cuts at 'a' or attaches underneath at 'b'.]
 (;W[pf])
 (;W[ob]))
 (;B[pf]C[Black 5 makes sense with local support on either side.]
 ;W[od]
 ;B[nc]
 ;W[pc]LB[ld:B][nd:A]C[White 8 is the proper move.
 'a' or 'b'.]
 (;B[nd]
 ;W[oe]LB[kd:a][pi:b]C[Now 'a' and 'b' are miai.])
 (;B[ld]
 ;W[re])))
 (;W[pd]
 ;B[of]
 ;W[od]
 ;B[mc]LB[nc:b][nd:a]C[White continues with 'a' to get outside, or 'b' to take the corner.]
 (;W[nd]
 ;B[md]
 ;W[nf])
 (;W[nc]
 ;B[nd]
 ;W[nb]
 ;B[md]
 ;W[ob]))
 (;W[od]C[White 4 is a mistake.]
 ;B[pd]
 ;W[pc]
 ;B[ob]LB[pe:a]C[White will have trouble looking after the corner stones. White could play 'a' and immediately sacrifice the stones, but the loss would be considerable.]
 ;W[pe]
 ;B[qd]
 ;W[qe]
 ;B[rd]
 ;W[re]LB[rc:a][oe:b]C[Simply taking with 'a' is good enough for Black. Black may also atari first with 'b' if that is strategically sensible.]))
 (;B[pf]C[
 Large Knight's Move = Oogeima = Nunmokcha = Da` Fei
 ----------------------------------------------------
+]
 ;W[od]
 ;B[pd]
 ;W[pc]
 ;B[ob]
 ;W[nd]
 ;B[qd]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[mc]
 ;W[md]
 ;B[lc]
 ;W[qe]
 ;B[pe]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[oh]
 ;W[mf]))
 (;W[qe]LB[qc:A][oe:B][qg:C]C['a' is better than 'b'.
 'c' is not recommended.]
 (;B[qc]LB[pg:B][qh:A]C['a' is correct, 'b' is questionable.]
 (;W[qh]
 ;B[pg]C[Black doesn't just take the corner, but still can go for influence.]
 ;W[qg]
 ;B[oe])
 (;W[pg]
 ;B[qi]))
 (;B[oe]
 ;W[qc]LB[oc:3][qc:2][oe:1][qe:4]C[This result is the same variation as the one referenced by the given numbers (which also has only one move continuation here).]
 ;B[pg])
 (;B[qg]
 ;W[qc]
 ;B[lc]))
 (;W[oe]LB[qc:B][qd:A]C['a' or 'b'.]
 (;B[qd]LB[oc:3][qd:1][oe:4]C[This result is similar to the variation referenced by the numbers.])
 (;B[qc]
 ;W[nc]LB[nd:B][od:A]C[The move is questionable.
 'a' is correct, 'b' is not recommended, Black falls back from a superior to an equal or inferior position.]
 (;B[od]
 ;W[nd]
 ;B[ne])
 (;B[nd]
 ;W[od]LB[ob:A][mc:B]C['a' fight, 'b' both settle.]
 (;B[ob]
 ;W[mc]
 ;B[me])
 (;B[mc]
 ;W[pc]
 ;B[nb]
 ;W[ob]
 ;B[nc]
 ;W[pd]
 ;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[rc]
 ;B[qa]
 ;W[qd]
 ;B[id]
 ;W[pi]))))
 (;W[dp]LB[qd:A][oe:C][pe:B][qe:D]C[
 Tenuki
 -------
 'a' or 'b'.
 'c' aims at a rare three-stone-shimari.
 'd' is a trick play.
+]
 (;B[qd]LB[oc:3][qd:1]C[These variations are covered as Komuku-Tenuki-Mokuhazushi, referenced by the numbers.])
 (;B[pe]LB[oc:3][pe:1]C[This variation is covered as Takamoku-Tenuki-Mokuhazushi, referenced by the numbers.])
 (;B[oe]
 ;W[pp]
 ;B[qe]C[Pillbox shape.
 ])
 (;B[qe]
 ;W[pd]
 ;B[oe]LB[qc:B][od:A]C['a' is correct, 'b' is inferior.]
 (;W[od]
 ;B[nd]LB[nc:C][pc:B][pe:A]C['a' is correct,
 'b' is possible.
 'c' is getting tricked.]
 (;W[pe]
 ;B[pf]LB[qc:A][of:B]C['a' is correct, 'b' is getting tricked.]
 (;W[qc])
 (;W[of]
 ;B[qd]
 ;W[pc]
 ;B[qc]
 ;W[pb]
 ;B[ne]))
 (;W[pc]
 ;B[pe]
 ;W[nc]
 ;B[mc]LB[nb:A][ob:B]C['a' is correct. 'b' gives a ko.]
 (;W[nb]
 ;B[mb]
 ;W[ob]LB[md:A]C[White aji to cut at 'a'.])
 (;W[ob]
 ;B[nb]))
 (;W[nc]
 ;B[pc]
 ;W[qd]
 ;B[qc]
 ;W[rd]
 ;B[pe]
 ;W[rc]
 ;B[rb]
 ;W[re]
 ;B[rf]
 ;W[ne]
 ;B[md]
 ;W[qf]
 ;B[qg]
 ;W[pf]
 ;B[of]
 ;W[pg]
 ;B[og]
 ;W[ph]
 ;B[rg]
 ;W[qb]
 ;B[qa]
 ;W[sb]
 ;B[ra]))
 (;W[qc]
 ;B[od]
 ;W[pe]
 ;B[pf]
 ;W[qf]LB[rf:A][qg:B]C['a' is correct. 'b' is a mistake.]
 (;B[rf]
 ;W[qg]LB[qd:B][rd:A]C['a' is correct, 'b' is questionable.]
 (;B[rd]
 ;W[rc]
 ;B[rg]
 ;W[qh]
 ;B[rh]LB[of:A][qi:B]C['a' os correct, 'b' is questioanable.]
 (;W[of]
 ;B[pg]
 ;W[qi]
 ;B[og]
 ;W[qd]
 ;B[re]
 ;W[pb]
 ;B[ri]
 ;W[ob]
 ;B[qj]
 ;W[nf])
 (;W[qi]
 ;B[of]
 ;W[qd]
 ;B[re]
 ;W[pb]
 ;B[ob]
 ;W[ri]
 ;B[sb]
 ;W[rb]
 ;B[sc]
 ;W[sd]
 ;B[se]
 ;W[qa]
 ;B[pc]
 ;W[sh]
 ;B[oa]
 ;W[sg]
 ;B[pa]
 ;W[si]
 ;B[qb]))
 (;B[qd]
 ;W[pc]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[ob]
 ;B[nb]LB[pb:B][qh:A]C['a' is correct, taking the corner, if White has the ladder, 'b' is inferior making the corner seki, but unavoidable, if Black has the ladder.]
 (;W[qh]LB[pb:B][og:A]C['a' is necessary, Black cannot capture on 'b' if White has the ladder.]
 (;B[og]
 ;W[sb])
 (;B[pb]
 ;W[qb]
 ;B[oa]
 ;W[of]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[pi]
 ;B[oh]
 ;W[nh]))
 (;W[pb]
 ;B[pg]
 ;W[rg]
 ;B[sb]LB[qa:B][sc:A]C['a' -> seki, 'b' -> unfavorable ko.]
 (;W[sc]
 ;B[sd]
 ;W[ra]
 ;B[sf]
 ;W[qi]
 ;B[mc])
 (;W[qa]
 ;B[oa]
 ;W[sf]
 ;B[na]
 ;W[pa]
 ;B[ra]
 ;W[sa]
 ;B[sc]
 ;W[re]
 ;B[ra]))))
 (;B[qg]
 ;W[rf]
 ;B[pg]
 ;W[re])))))
 (;B[od]LB[qc:b][qd:a][dp:c]C[
 -4 Point = Takamoku = Gomok = Gaomu`
 ----------------------------------------------
 The takamoku (high) point (5-4). With its emphasis on influence, the 5-4 point complements the 4-4 (hoshi) point in creating an influence-oriented fuseki.
 White approaches with 'a' or 'b'. White 'b' is played when Black has support at the top.
 After White play tenuki 'c', Black can choose a shimari.
 There are several 5-4 trick plays, often involving unfathomable reading, with pitfalls at any point. Some simple variations of trick plays are covered here.
+]
 (;W[qd]LB[qc:a][pd:h][qe:b][re:g][pf:c][qf:e][pg:d][qg:f]C[
 Komoku
 ---------
 Black responds with 'a', 'b', 'c', 'd ' to 'f'.
 Black 'c' is the most appropriate response given the influence orientation of the 5-4, but also the most complicated one.
 'e' and 'g' are trick plays. Black 'g' takes thickness for corner territory.
 'h' is not recommended.
 g7, f6, e5, d4, c3, b2, a1
+]
 (;B[qc]LB[kc:b][rc:a][pd:c]C[
 Low attach to draw back = Hikui-Tsuke-Hiki
 ---------------------------------------------
 White continues with 'a' or 'b'.
 'c' is a mistake.
+]
 (;W[rc]
 ;B[pc]LB[re:a][pf:b][qf:c]C[White continues with 'a' to 'c'.]
 (;W[re]LB[kc:a][qf:c][pg:b]C[Black continues with 'a'. If a Black extension such as 'a'
 already exists, Black continues with 'b'.
 Playing 'c' without having a is premature.]
 (;B[kc]LB[oe:b][pf:a][pg:d][dp:c]C[White continues with 'a' or 'b', or plays elsewhere ('c').
 'd' is a mistake.]
 (;W[pf]LB[oe:c][pg:b][dp:a]C[
 * Joseki *
 Black may play elsewhere ('a'). Black 'b' and 'c' are local continuations.]
 ;B[]LB[ic:c][ld:d][nd:b][ne:a]C[Black plays elsewhere. White can press with 'a', 'b' or 'd'.
 White 'a' emphasizes the right side, while 'b' and 'd' are pure reduction moves.
 White 'c' can be played if White values the top.]
 (;W[ne]LB[mc:a][nd:b]C[Black can protect at 'a' or 'b'.]
 (;B[mc])
 (;B[nd]))
 (;W[nd]
 ;B[me]
 ;W[ld])
 (;W[ic]CR[hc]LB[ke:a][cq:b]C[White plays 9 with support in the top-left corner.
 A Black extension to the red dot before White 10 is a first-rate fuseki point.
 Black continues with 'a'. Black should not ignore White 10 by playing elsewhere ('b').]
 (;B[ke]C[White 20 can be considered a forcing move.])
 (;B[]C[Black ignores White's checking extension, a mistake.
 White invades.]
 ;W[mc]LB[ld:b][md:a]C[Black continues with 'a', and lets White connect underneath.
 Black 'b' is unreasonable.]
 (;B[md])
 (;B[ld]C[Black 11 is unreasonable.]
 ;W[md]
 ;B[me]
 ;W[kb]
 ;B[jb]
 ;W[lb]
 ;B[jc]
 ;W[ib]
 ;B[ja]
 ;W[ne])))
 (;W[ld]C[White 9 is a simple reduction move.]
 ;B[lc]))
 (;W[oe]
 ;B[ne]
 ;W[of]
 ;B[qf]C[Black 11 is a tesuji at the vital point of White's shape.]
 ;W[pd]
 ;B[nd]
 ;W[pi]C[
 * Joseki *])
 (;W[]LB[qf:b][pg:a]C[White plays elsewhere.
 Black continues with 'a' or 'b'. Black 'a' aims for influence,
 while 'b' aims to build a presence on the right.]
 (;B[pg]LB[oe:b][qf:a]C[White continues with 'a' or 'b'.]
 (;W[qf]
 ;B[pf]LB[qh:a][cq:b]C[White continues locally with 'a', or switches elsewhere again ('b').]
 (;W[qh])
 (;W[]C[White plays elsewhere again.]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[]C[Amazingly, White plays elsewhere again.]
 ;B[sg]
 ;W[rf]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[pe]LB[pd:b][oe:a]C[Black continues with 'a'. Black 'b', making a false eye, is not
 recommended.]
 (;B[oe]
 ;W[pd]C[There is still a cutting point in Black's outside wall. This outcome should not favor Black (with three White moves elsewhere).])
 (;B[pd]C[Black should not play 20 here unless White can be killed.]
 ;W[oe])))
 (;W[oe]
 ;B[pe]
 ;W[pd]
 ;B[oc]
 ;W[ne]
 ;B[qe]
 ;W[rd]
 ;B[qg]
 ;W[qb]
 ;B[pb]
 ;W[qa]
 ;B[ng]C[Black 21 is a possible continuation.]
 ;W[mc]
 ;B[mb]LB[nb:b][le:a]C[White continues with 'a'. White 'b' does not work.]
 (;W[le])
 (;W[nb]LB[nc:b][md:a]C[White 24 is a mistake. Black continues with 'a'. Black 'b' is a mistake.]
 (;B[md]C[Black's double contact play is a tesuji.]
 ;W[lc]
 ;B[lb]
 ;W[nc]
 ;B[nd]
 ;W[ld]
 ;B[pa]
 ;W[sb]
 ;B[me]
 ;W[kd])
 (;B[nc]C[Black 24 is a mistake.]
 ;W[lb]
 ;B[md]
 ;W[lc]
 ;B[nd]))))
 (;B[qf]LB[pe:a][qg:b]C[Black 8 emphasizes the right side.
 White continues with 'a' or 'b'.]
 (;W[pe]LB[of:B][pg:A]C['a' is correct, 'b' is a trick play which is not recommended.]
 (;B[pg]LB[oe:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[oe]LB[nd:b][ng:a]C[Black continues with 'a'. Black 'b' is a mistake in direction.]
 (;B[ng]LB[me:B][mg:A]C['a' is correct. 'b' is a mistake.]
 (;W[mg]LB[nd:a][ne:c][mf:d][nf:b]C[Black continues with 'a'. Black 'b', 'c' and 'd' are unreasonable.]
 (;B[nd]
 ;W[nf]
 ;B[nh]
 ;W[lf]C[
 * Joseki *])
 (;B[nf]C[Black 15 is a mistake.]
 ;W[ne]LB[mc:A][mf:B]C['a' is less bad than 'b'.]
 (;B[mc]
 ;W[nc]
 ;B[nd]
 ;W[me]
 ;B[md]
 ;W[mf]
 ;B[nh]
 ;W[li])
 (;B[mf]
 ;W[mc]
 ;B[md]
 ;W[nd]
 ;B[nc]
 ;W[nb]
 ;B[oc]
 ;W[mb]
 ;B[ob]
 ;W[qb]))
 (;B[ne]C[Black 15 is a mistake.]
 ;W[nd]
 ;B[nc]
 ;W[md]
 ;B[mc]
 ;W[nf]
 ;B[me]
 ;W[og]C[Black may be better off at top, but the original aim of building the right side is ruined.]
 ;B[nh]
 ;W[oh])
 (;B[mf]
 ;W[nf]
 ;B[ne]
 ;W[of]
 ;B[me]
 ;W[og]))
 (;W[me]
 ;B[nd]
 ;W[ne]
 ;B[ld]))
 (;B[nd]C[Black 12 is change in direction from emphasis on the right, and as such a mistake.]
 ;W[og]
 ;B[oh]
 ;W[ng]
 ;B[ph]
 ;W[ne]))
 (;W[pf]LB[og:A][qg:B]C['a' or 'b'.]
 (;B[og]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[rf])
 (;B[qg]
 ;W[nf])))
 (;B[of]
 ;W[pf]
 ;B[pg]LB[oe:A][og:B]C['a' is correct. 'b' is getting tricked.]
 (;W[oe]
 ;B[ne]LB[og:B][qg:A]C['a' is correct. 'b' is getting tricked.]
 (;W[qg]LB[og:A][qh:B]C['a' is correct. 'b' is a mistake.]
 (;B[og]
 ;W[qh]TR[kc]C[The triangled stone is now too near to the wall.]
 ;B[md]LB[nf:A]C[Still a cut on 'a'.])
 (;B[qh]
 ;W[og]
 ;B[rg]
 ;W[nf]))
 (;W[og]
 ;B[qe]))
 (;W[og]
 ;B[oe]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi])))
 (;W[qg]LB[rf:b][pg:a]C[White 9 is an emergency measure, and not recommended as an ordinary play. White is too low.
 Black 'a', keeping White low, is good enough. If Black wants to play tough, 'b'.]
 (;B[pg]
 ;W[rg]
 ;B[ph]
 ;W[qi])
 (;B[rf]
 ;W[rg]
 ;B[se]
 ;W[sd]
 ;B[sf]
 ;W[pf]
 ;B[qe]
 ;W[pe]))))
 (;W[pg]
 ;B[pe]
 ;W[qg]))
 (;B[pg]C[Black plays 7 when Black already has support at top as shown.]
 ;W[qf]
 ;B[pf]C[White has been had. This variation demonstrates why White enters at the 3-3 point rather than play the 3-4 when Black has an extension at top as shown.])
 (;B[qf]
 ;W[pe]
 ;B[ph]LB[kd:B][ld:A]C['a' or 'b'.]
 (;W[ld])
 (;W[kd])))
 (;W[pf]C[White 6 is a strategy when Black has the lower right corner and White wants to make a significant extension to the lower side.]
 ;B[rb]
 ;W[qj])
 (;W[qf]C[White plays 6 when Black already has an extension as shown.]
 ;B[rb]
 ;W[qi]))
 (;W[kc]LB[pd:a][rd:b][qe:c]C[Black continues with 'a', 'b' or 'c'.]
 (;B[pd]
 ;W[qe]LB[pb:a][rc:b][qg:c]C[Black continues with 'a' and ends in sente. Black 'b' is not recommended, as Black gets a narrow extension and ends in gote.]
 (;B[pb]
 ;W[qh])
 (;B[rc]C[ Black 7 results in a narrow extension and ends in gote for Black.]
 ;W[qh]
 ;B[mc]C[Black 9 nine is one space too close.])
 (;B[qg]
 ;W[rc]
 ;B[rb]C[
 If you know the follow-up, please email: kogo@waterfire.us.]))
 (;B[rd]LB[pc:a][qe:b]C[White continues with 'a'. White 'b' is a mistake in order.]
 (;W[pc]
 ;B[pd]
 ;W[qe]LB[rc:a][re:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]
 ;W[oc]C[White 10 is a continuation.]
 ;B[nc]
 ;W[nb]
 ;B[nd]
 ;W[mb]
 ;B[pf])
 (;B[re]
 ;W[qf]
 ;B[qb]
 ;W[of]C[
 * Joseki *]
 ;B[]LB[ob:b][nd:a]C[Black plays elsewhere. White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[nc]
 ;W[md])
 (;W[ob]
 ;B[nb]
 ;W[nc]
 ;B[oc]
 ;W[mb]
 ;B[pb]
 ;W[na])))
 (;W[qe]C[White 6 is a mistake in order.]
 ;B[re]
 ;W[pc]
 ;B[qb]LB[pd:b][qf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qf]
 ;B[oc]LB[kc:4][pc:8][qe:6]C[In Comparision with the result of White 8 before White 6, one can see, that after the mistake White 6, there is now no aji of connecting White 8 to 4.])
 (;W[pd]C[White 10 is a mistake.]
 ;B[qf]
 ;W[oe]C[White is getting short of liberties.]
 ;B[nd]
 ;W[ne]
 ;B[ob]C[And the Black stones can connect with 15.]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[pa]
 ;W[pe]
 ;B[mb])))
 (;B[qe]
 ;W[pd]LB[pc:a][pe:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pc]
 ;W[pe]
 ;B[rd]LB[re:a][pf:b]C[Joseki continues with 'a'. White 'b' is from a professional game, but not recommended.]
 (;W[re]
 ;B[qf]LB[rc:b][oe:a]C[White continues with 'a' for influence, or 'b' to live peacefully in the corner at a loss of influence.]
 (;W[oe]
 ;B[rc]
 ;W[nd]
 ;B[oc]
 ;W[pg]
 ;B[rf]
 ;W[ng]C[
 * Joseki *])
 (;W[rc]C[White 12 gives a peaceful result.]
 ;B[of]LB[oc:b][sd:a]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[sd]
 ;B[pf]
 ;W[rb]
 ;B[oe]
 ;W[rd]CR[oc]C[Next, Black plays elsewhere. The marked cutting point is small early in fuseki.])
 (;W[oc]C[White cannot cut at 14.]
 ;B[oe]
 ;W[sd]
 ;B[pf]
 ;W[rd]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc]
 ;B[rb]
 ;W[sb]
 ;B[qb]LB[pa:b][rf:a]C[White 'a' results in a ko, but the stakes are too high. White 'b' and Black wins the fight outright.]
 (;W[rf]
 ;B[rg]
 ;W[rh]
 ;B[sg]
 ;W[sf]
 ;B[qh]
 ;W[pa]
 ;B[mb]
 ;W[lb]
 ;B[ld]
 ;W[lc]
 ;B[pb]
 ;W[ma]
 ;B[ra]
 ;W[na]
 ;B[sa]C[Black has first shot at the ko. White loses.])
 (;W[pa]
 ;B[rf]CR[sf]C[White can provoke a ko by playing at the marked spot, but a White loss is inevitable.]))))
 (;W[pf]LB[re:b][qf:a]C[White 10 was played by Sakata Eio against Rin Kaiho in the 2nd game of the 1965 Meijin Title match.
 Black gets a favorable result.
 Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qf]
 ;W[rc]
 ;B[pg]LB[re:b][of:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[of]
 ;B[rb]
 ;W[re]
 ;B[sc]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[se]
 ;W[oh])
 (;W[re]C[White 14 is not recommended. The corner ends in a seki. Black has a favorable position on the right, while the top equals out at best for White.]
 ;B[of]
 ;W[sd]
 ;B[oe]
 ;W[rd]
 ;B[qg]
 ;W[oc]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mb]
 ;B[rb]
 ;W[sb]
 ;B[ra]
 ;W[rf]
 ;B[rg]
 ;W[sf]
 ;B[pb]
 ;W[og]
 ;B[md]
 ;W[mc]
 ;B[mf]
 ;W[qa]
 ;B[pi]))
 (;B[re]C[Black must have the ladder to play this way. Even so, White gets a ladder block move in the lower left corner.]
 ;W[oc]
 ;B[nc]
 ;W[ob]
 ;B[nb]
 ;W[nd]
 ;B[oe])))
 (;B[pe]C[Black 7 is not recommended. Black builds thickness in gote, gives away a large corner in the process, while White's pincer stone retains its purpose.]
 ;W[pc]
 ;B[oc]
 ;W[pb]
 ;B[ob]
 ;W[re]
 ;B[rf]
 ;W[rd]
 ;B[oe])))
 (;W[pd]
 ;B[pc]
 ;W[oe]
 ;B[ne]
 ;W[nd]
 ;B[oc]
 ;W[nf]
 ;B[me]
 ;W[of]
 ;B[mf]C[White failed to establish eye-shape, and Black got more points.]))
 (;B[qe]LB[pd:B][re:A]C[
 High attach to draw back = Taka-Tsuke-Hiki
 ----------------------------------------------
 Black 3 aims to build influence, but this could alter. A favorable ladder for Black is desirable, but not necessary.
 'a' is correct. 'b' is a mistake.
+]
 (;W[re]LB[pe:a][qf:b]C[Black continues with 'a', possibly 'b'. 'b' is rare.]
 (;B[pe]LB[pc:c][qf:a][rf:b]C[White continues with 'a' (joseki).
 After White 'b', White is low.
 White 'c' is not joseki.]
 (;W[qf]LB[rd:a][pf:c][rf:b][pg:d]C[Black continues with 'a', 'b', 'c' or 'd'.
 Black must have the ladder to play 'a'.
 outcomes:
 a1 - Black outside (Black must have the ladder)
 b2 - Black inside
 c3 - Fighting
 d4 - Black avoids basic patterns, and may trick White]
 (;B[rd]C[Black plays 7 to take the outside. Black must have the ladder to catch White 6 to play this way.]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[qg]LB[ob:a][oc:c]C[
 * Joseki *
 Black must have the ladder.
 White continues at 'a' with joseki. To play elsewhere ('b') invites a loss. If White does it once, he might well do it twice more, get a ko and have good position on the whole board.
 White 'c' is a mistake.]
 (;W[ob]
 ;B[pf]
 ;W[]C[White plays elsewhere.]
 ;B[nb]LB[pb:c][nc:a][oc:b]C[This is Black's continuation to try to seal White in, but White trades the corner for the side with 'a'.
 White 'b' is vulgar.
 White 'c' preserves the corner if the side is not worth the corner sacrifice.]
 (;W[nc]
 ;B[oc]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[pc]LB[qb:B][nd:A]C['a' is correct, although White sacrifices the corner to take sente.
 After White 'b' the corner lives, but outside group is severely attacked.]
 (;W[nd]
 ;B[pa]LB[qb:a]C[If Black omits 23, White 'a' brings the corner back to life. The result is equal.])
 (;W[qb]
 ;B[pa]
 ;W[sb]
 ;B[jc]
 ;W[nd]
 ;B[mf]))
 (;W[oc]C[White 15 is a vulgar move.]
 ;B[nc]
 ;W[pd]
 ;B[qb]C[Black 19 is effectively timed.]
 ;W[pb]
 ;B[nd]C[Black gets good outside influence while retaining some ominous corner potential.])
 (;W[pb]C[White keeps the corner, giving Black the top.]
 ;B[nc]))
 (;W[]C[White playing elsewhere is a mistake.]
 ;B[pc]LB[qc:a]C[White plays 'a' to save the corner, or elsewhere ('b') and loses the corner.]
 (;W[qc]
 ;B[pf]C[White play elsewhere the second time.]
 ;B[pb]C[The move is sente, but White plays elsewhere the third time.]
 ;B[ra]C[After giving White three moves elsewhere, Black can nothing else but a ko.]
 ;W[rb]
 ;B[sb]
 ;W[qa]
 ;B[qb]
 ;W[sa])
 (;W[]C[White plays elsewhere.]
 ;B[qb]C[Black can capture the corner, but has taken many stones to do so.]))
 (;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[pf]
 ;W[nd]
 ;B[mc]
 ;W[ne]
 ;B[kd]C[The White center stones are heavy.]))
 (;B[rf]C[Black plays 7 to take the inside.]
 ;W[rg]LB[rd:a][pf:b]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[sf]
 ;B[qc]LB[pf:a][og:b][dp:c]C[White continues with 'a'. White 'b' is not recommended. White should not forget 'a' and play elsewhere on 'c'.]
 (;W[pf]LB[ne:b][of:a][dp:c]C[Black continues with 'a', 'b' or elsewhere.]
 (;B[of]C[Continuation.]
 ;W[og]
 ;B[nf]LB[jc:A][ng:B]
 (;W[jc]LB[lc:a][dp:b]C[Black continues with 'a'. Playing elsewhere ('b') is a mistake.]
 (;B[lc]C[Black 17 is a big point.])
 (;B[]C[Black should not play elsewhere.]
 ;W[rc]LB[pd:a][sd:b]C[Black continues with 'a'. Black 'b' is unreasonable.]
 (;B[pd]C[Black 18 is submissive, but necessary.]
 ;W[sd]
 ;B[rb]
 ;W[qd]
 ;B[pb])
 (;B[sd]C[Black 18 is a mistake, thanks to a White tesuji.]
 ;W[pc]LB[qb:b][pd:a]C[Black continues with 'a'. Black 'b' compounds the mistake.]
 (;B[pd]
 ;W[qb]
 ;B[qd]
 ;W[oc])
 (;B[qb]C[Black 20 compounds the mistake.]
 ;W[pd]
 ;B[oe]
 ;W[sc]))))
 (;W[ng]
 ;B[mf]))
 (;B[ne]LB[lc:A][nf:B]C[White can attack on 'a'. 'b' is wrong.]
 (;W[lc]C[Black should not tenuki.]
 ;W[rc]LB[pd:B][sd:A]C['a' is correct. 'b' is a mistake.]
 (;B[pd]
 ;W[sd]
 ;B[rb]
 ;W[qd]
 ;B[pb])
 (;B[sd]
 ;W[pc]LB[qb:B][pd:A]C['a' is bad, 'b' is worse.]
 (;B[pd]
 ;W[qb]
 ;B[qd]
 ;W[oc])
 (;B[qb]
 ;W[pd]
 ;B[oe]
 ;W[sc])))
 (;W[nf]LB[nf:14]C[White 14 is a mistake which only makes Black stronger.]
 ;B[mf]
 ;W[of]
 ;B[me]))
 (;B[]C[Black plays elsewhere.]
 ;W[ne]
 ;B[mc]))
 (;W[og]C[White 12 lacks force, as the continuation demonstrates.]
 ;B[]
 ;W[rc]C[White 13 no longer works because of the extra liberty to the right of Black 5 (where White 12 should be).]
 ;B[sd]
 ;W[pc]
 ;B[qb])
 (;W[dp]
 ;B[pg]
 ;W[qi]))
 (;B[pf]LB[sf:a][qg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sf]C[White 10 is the only move.]
 ;B[qg]LB[rf:B][qh:A]C[After White 'a' a complicated fight arises. White 'b' is simple, but weak.]
 (;W[qh]LB[rf:a][pg:b]C[White must not play 12 at 'a', letting Black extend to 12.
 Black continues with 'a' or 'b'.]
 (;B[rf]LB[rc:a][dp:b]C[White continues locally with 'a'.
 White 'b' is from a professional game, where White played elsewhere.]
 (;W[rc]LB[pg:a][ph:b]C[Black continues with 'a'. Black 'b' is vulgar.]
 (;B[pg]
 ;W[ri]
 ;B[oi])
 (;B[ph]C[Black 15 lets White improve his shape.]
 ;W[qi]
 ;B[pi]
 ;W[pj]
 ;B[oj]
 ;W[pk]CR[oi]C[White does not shrink from the ko, and aims to cut at the marked location.]))
 (;W[]LB[rd:b][dp:a]C[Variation 'a' is from the final preliminary round of the 1957 Honinbo Title: White - Sugiuchi; Black - Etsuo.
 In variation 'b', Black challenges the ko.]
 (;B[]C[Black responds to White's move by playing elsewhere.]
 ;W[qf]
 ;B[pg]
 ;W[ph]
 ;B[oh]
 ;W[oi]
 ;B[rf]
 ;W[nh]
 ;B[rh]
 ;W[qf]
 ;B[og]
 ;W[ri]
 ;B[ni]
 ;W[oj]
 ;B[]
 ;W[mh]
 ;B[rf]
 ;W[sh]
 ;B[rd]
 ;W[qf]
 ;B[qc])
 (;B[rd]C[Black challenges White, but lacks ko threats.]
 ;W[qf]
 ;B[qc]
 ;W[pg]
 ;B[og]
 ;W[oh]
 ;B[ng]
 ;W[nh])))
 (;B[pg]
 ;W[ph]
 ;B[rf]
 ;W[rc]
 ;B[rh]
 ;W[qf]
 ;B[oh]
 ;W[oi]
 ;B[rf]
 ;W[sg]
 ;B[nh]
 ;W[ni]
 ;B[mi]
 ;W[pj]
 ;B[mh]))
 (;W[rf]
 ;B[qh]
 ;W[qc]))
 (;W[qg]C[White 10 is a mistake.]
 ;B[rd]
 ;W[sf]
 ;B[qc]LB[pf:A]C[Now White is tricked, because after Black takes the corner, White wants to play 'a' as in the joseki, but the point is already occupied by the opponent.])))
 (;B[pf]LB[qg:A][rg:B]C[Black 7 is for strong fighters.
 'a' is correct. 'b' is a mistake.]
 (;W[qg]
 ;B[rf]LB[rc:C][rd:A][rg:B]C['a' is correct, 'b' and 'c' are mistakes.]
 (;W[rd]LB[pg:b][qh:a]C[Black continues with 'a'. Black 'b' builds thickness, but gives up too much territory.]
 (;B[qh]LB[pg:b][rg:a]C[White continues with 'a' or 'b'. White 'a' can give a settled shape or start a fight at White's choice. White 'b produces a fight.]
 (;W[rg]
 ;B[pg]LB[ph:a][rh:b]C[White 'a' starts a fight. Alternately, to avoid a fight, White may play 'b', which settles the shape without loss to White.]
 (;W[ph]C[White 14 is a fighting move.]
 ;B[rh]
 ;W[sf]
 ;B[qj]
 ;W[oh]
 ;B[oj]
 ;W[mh]
 ;B[ld]C[
 * Joseki *])
 (;W[rh]C[White plays it safe.]
 ;B[qi]))
 (;W[pg]C[White 12 starts a fight.]
 ;B[rg]LB[og:b][ph:a]C[White continues with 'a', possibly 'b'.]
 (;W[ph]
 ;B[qi]LB[oc:b][pi:a]C[White continues with 'a' or 'b'.]
 (;W[pi]
 ;B[qj]
 ;W[oc]
 ;B[nc]LB[ob:a][pc:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[ob]
 ;B[pd]
 ;W[pc]
 ;B[md]
 ;W[nb]
 ;B[lc]
 ;W[ne]
 ;B[nd]
 ;W[ng])
 (;W[pc]C[White 20 is not recommended.]
 ;B[nd]))
 (;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[pi]
 ;W[nh]
 ;B[oi]
 ;W[ng]
 ;B[nd]))
 (;W[og]C[White 12 is not recommended.]
 ;B[pc]LB[qc:A][pd:B]C['a' settles the corner.
 'b' creates a a ko, leading to furikawari with superior Black influence and a White corner.]
 (;W[qc]
 ;B[pb]
 ;W[qb]CR[pd]C[White is alive because of the liberty at the marked point, which
 makes a Black play there sente for the White group in the corner.]
 ;B[pi])
 (;W[pd]
 ;B[oe]
 ;W[oc]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[sc]
 ;W[sd]
 ;B[qa]
 ;W[rh]C[creates ko threats]
 ;B[ri]
 ;W[pa]
 ;B[sa]
 ;W[sf]
 ;B[sh]
 ;W[ra]
 ;B[ng]
 ;W[pb]
 ;B[oh]))))
 (;B[pg]
 ;W[qh]
 ;B[ph]
 ;W[qi]))
 (;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[qc]LB[pf:A][qg:8]TR[pg]C[White is tricked, because after Black takes the corner, White wants to play onto A, as he does in the joseki.
 White 8 would even be much better on the marked position.])
 (;W[rc]
 ;B[se]
 ;W[rd]
 ;B[qh]
 ;W[rg]
 ;B[pg]
 ;W[rh]
 ;B[qi]LB[sg:B][ri:A]C[Later, Black 'a' threatens a ko at 'a'.]))
 (;W[rg]
 ;B[qg]
 ;W[rf]
 ;B[qh]LB[qc:A]C[Black has a continuation at 'a' later.]))
 (;B[pg]LB[qc:a][pf:b][qg:d][qh:c]C[White continues with 'a' or 'b'. White 'c' and 'd' are mistakes.]
 (;W[qc]
 ;B[pf]
 ;W[rf])
 (;W[pf]C[soto-magari (outside turn)]
 ;B[of]
 ;W[rg]
 ;B[og]
 ;W[qi])
 (;W[qh]C[White 8 is a mistake.]
 ;B[rd]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[qg])
 (;W[qg]C[White 8 is a mistake.]
 ;B[qh]LB[ph:B][rh:A]C[White continues on 'a', 'b' is an overplay.]
 (;W[rh]
 ;B[ph])
 (;W[ph]
 ;B[pf]
 ;W[qi]
 ;B[rh]
 ;W[rg]
 ;B[sg]
 ;W[rf]
 ;B[ri]
 ;W[qj]
 ;B[rj]
 ;W[qk]
 ;B[rk]
 ;W[ql]
 ;B[rc]
 ;W[rd]
 ;B[qc]))))
 (;W[rf]C[White plays 6 to avoid the result in which his outside stone is captured, but in the local context this move is disadvantageous.]
 ;B[qc]LB[rc:a][rd:b]C[White continues with 'a'. White 'b' is not joseki.]
 (;W[rc]
 ;B[pd]
 ;W[rd]LB[qb:A][ph:B]C['a' is joseki, 'b' emphasizes the center.]
 (;B[qb]
 ;W[qh]
 ;B[kc]C[
 * Joseki *])
 (;B[ph]
 ;W[qb]))
 (;W[rd]
 ;B[pc]
 ;W[qh]
 ;B[kc]LB[qk:a]C[White does not have as good an eye shape as joseki, and needs to add a play at 'a' to get a satisfactory position.]))
 (;W[pc]CR[qc]LB[oc:b][rf:a]C[White attempts to forestall the Black contact play at the marked location.
 Black continues at 'a'. Black 'b' is not as good.]
 (;B[rf]
 ;W[oc]
 ;B[nc]LB[nb:a][nd:b]C[White continues with 'a'. White 'b' is unreasonable.]
 (;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[rd]
 ;B[qg])
 (;W[nd]LB[lc:A][mc:B]C[White 10 is unreasonable. White starts a losing fight.
 Both 'a' and 'b' are good for Black.]
 (;B[lc]
 ;W[ne]
 ;B[nb]
 ;W[rd]
 ;B[pg]
 ;W[le]
 ;B[jd])
 (;B[mc]
 ;W[md]
 ;B[ld]
 ;W[mf]
 ;B[kc]
 ;W[rd]
 ;B[pg]
 ;W[of]
 ;B[pi])))
 (;B[oc]C[Black 7 is not recommended.]
 ;W[rf]
 ;B[kc]LB[qc:a]C[Black cannot attach at 'a' successfully when White plays elsewhere.]
 ;W[]C[White plays elsewhere.]
 ;B[qc]C[Black cannot play 11 successfully, though White must play correctly.]
 ;W[qb]
 ;B[rc]
 ;W[pb]
 ;B[rd]
 ;W[pd]
 ;B[rb]
 ;W[ob]LB[nb:a][oe:b]C[Black cannot block at 'a' because of the cutting point at 'b'.]
 ;B[nb]
 ;W[oe])))
 (;B[qf]C[The wisdom of Black 5 is controversial.
 Yoshio Ishida commented that the Black 5 is "slightly vulgar in style".
 This variation is seldom played by professionals.
 Supporting stones may make this play smart for Black.]
 ;W[pd]
 ;B[oe]LB[ob:a][oc:c][rf:b]C[White 'a' is old Japanese style.
 White 'b' is modern Korean style.
 'c' is inferior.]
 (;W[ob]LB[nb:A][rf:B]C[Black 'a' is joseki and emphasizes the top, Black 'b' the right,
 but is inferior.]
 (;B[nb]C[Black values the top.]
 ;W[pb]
 ;B[mc]
 ;W[rf]LB[id:B][qh:A]C['a' is joseki, 'b' is questionable.]
 (;B[qh]CR[of]LB[pe:a]C[
 * Joseki *
 White has solid corner territory.
 Black still faces the aji of White's push at 'a' and the cut at the marked point, so the result is not generally considered equal.])
 (;B[id]
 ;W[og]
 ;B[of]
 ;W[qg]
 ;B[ng]
 ;W[oh]
 ;B[nh]
 ;W[oi]))
 (;B[rf]C[Black prefers the right.]
 ;W[mc]C[White moves out.]
 ;B[rd]
 ;W[rc]
 ;B[se]
 ;W[me]LB[pb:b][oc:a]C[White 14 gives White good position at top.
 White need not worry about connection. 'a' and 'b' are miai:
 Black 'a', White 'b'; Black 'b', White 'a'.]))
 (;W[rf]LB[rc:B][qh:A]C['a' is joseki. 'b' is a trick play.]
 (;B[qh]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[md]C[
 * Joseki *])
 (;B[rc]LB[rc:9][rd:B][pe:C][qg:A]C[Black 9 invites many White mistakes, but answered correctly it's just an empty threat.
 'a' gives White a better position. 'b' or 'c' fails to do so.]
 (;W[qg]
 ;B[pg]LB[ph:B][qh:A]C['a' is correct. 'b' is a mistake.]
 (;W[qh]LB[oc:A][rd:B]C[Black plays 'a'. 'b' does nothing.]
 (;B[oc]
 ;W[pb]LB[ob:A][rb:C][rd:B]C[Black plays 'a'. 'b' and 'c' do nothing.]
 (;B[ob]
 ;W[rb]LB[qc:B][ph:A]C['a' yields possible outside continuation. Inside with 'b', Black can do nothing.]
 (;B[ph]
 ;W[qi]
 ;B[id]
 ;W[pi]
 ;B[oi]
 ;W[oj]
 ;B[ni]
 ;W[po])
 (;B[qc]
 ;W[pc]
 ;B[qb]
 ;W[qa]
 ;B[sb]
 ;W[ra]
 ;B[rd]
 ;W[sd]))
 (;B[rd]
 ;W[rb])
 (;B[rb]
 ;W[qb]
 ;B[rd]
 ;W[ra]
 ;B[pc]
 ;W[qc]
 ;B[ob]
 ;W[sb]))
 (;B[rd]LB[pb:B][qb:A]C['a' is ok, 'b' fails.]
 (;W[qb]LB[pb:A][qc:B]C[Neither 'a' nor 'b' work.]
 (;B[pb]
 ;W[pc]
 ;B[ob]
 ;W[rb]C[White has a better position.])
 (;B[qc]
 ;W[pc]
 ;B[pb]
 ;W[ob]
 ;B[pa]
 ;W[oa]
 ;B[oc]
 ;W[qa]
 ;B[pb]
 ;W[pa]
 ;B[pe]
 ;W[pb]
 ;B[rb]
 ;W[mb]))
 (;W[pb]
 ;B[qb]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nb])))
 (;W[ph]
 ;B[rg]
 ;W[qh]
 ;B[rd]
 ;W[rh]
 ;B[pb]))
 (;W[rd]LB[oc:B][qh:A]C['a' is correct, 'b' a mistake.]
 (;B[qh]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[md])
 (;B[oc]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[jc]
 ;W[qg]
 ;B[pg]
 ;W[ph]
 ;B[og]
 ;W[qi]LB[jc:15]C[White comes out making Black 15 overconcentrated.]))
 (;W[pe]LB[rd:B][pf:A]C[Black continues on 'a', 'b' is a mistake.]
 (;B[pf]
 ;W[rd]LB[oc:B][qh:A]C['a' is correct, 'b' is questionable.]
 (;B[qh]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[md]
 ;W[rg]
 ;B[oh])
 (;B[oc]
 ;W[qh]LB[pb:B][of:A]C[A and 'b' are miai.]
 (;B[of]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[jd])
 (;B[pb]
 ;W[of]
 ;B[nf]
 ;W[og])))
 (;B[rd]
 ;W[pg]
 ;B[qg]
 ;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[se]
 ;W[pf]
 ;B[sf]
 ;W[oi]))))
 (;W[oc]C[White 8 is premature.]
 ;B[nc]
 ;W[pb]LB[ob:B][rf:A]C['a' influences the right side and is the right punishment. 'b' reverts to a balanced position.]
 (;B[rf]
 ;W[nb]
 ;B[mc])
 (;B[ob]
 ;W[pc]
 ;B[md]
 ;W[rf]
 ;B[qh]))))
 (;W[pd]
 ;B[pe]
 ;W[oc]
 ;B[nc]LB[pb:A][nd:B]C['a' or 'b'.]
 (;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[nd]C[Black's influence is superior.])
 (;W[nd]
 ;B[oe]LB[ob:A][mc:B]C['a' or 'b'.]
 (;W[ob]
 ;B[mc])
 (;W[mc]
 ;B[nb]LB[pb:A][md:B]C['a' is correct. 'b' is a mistake.]
 (;W[pb]
 ;B[mb]LB[rb:A][lc:B]C['a' is correct. 'b' is a mistake.]
 (;W[rb]
 ;B[lc])
 (;W[lc]
 ;B[md]
 ;W[ne]
 ;B[ld]
 ;W[kc]
 ;B[kd]LB[jc:B][nf:A]C[White loses stones on 'a' or 'b'.]
 (;W[nf]
 ;B[jc])
 (;W[jc]
 ;B[nf]
 ;W[me]
 ;B[lf]LB[rb:A]C[White still has to live on 'a', or Black enters on 'a'.]
 ;W[rb])))
 (;W[md]
 ;B[ob]
 ;W[pc]
 ;B[pb]
 ;W[qb]
 ;B[rd]
 ;W[qc]
 ;B[rc])))))
 (;B[pf]LB[oc:a][qf:b][rf:d][dp:c]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 Black 3 can be regarded as the most appropriate continuation from the 5-4 stone. At least, it is the most complicated.
 White continues with 'a' or 'b' or plays elsewhere ('c').
 White 'd' is not recommended.
 Most of the complications come after 'a', but White can simplify.
 White should have the ladder for 'b'.
+]
 (;W[oc]LB[nc:a][pc:c][pd:b]C[Black continues with 'a' to 'c'.
 Black 'a' and 'b' aim to build influence along the top and are easy.
 Black 'c' starts a difficult fight. Black must have the ladder off Black 3 to play this way.]
 (;B[nc]
 ;W[pc]LB[nb:c][md:b][nd:a]C[Black continues with 'a', 'b' or 'c'.
 C is for aggressive fighters]
 (;B[nd]LB[rf:b][dp:a]C[
 * Joseki *
 White often plays elsewhere (a). White continues locally with 'b'.]
 (;W[]LB[re:a][rf:b]C[White plays elsewhere.
 Black continues locally with 'a' or 'b'.
 'a' threatens to kill, 'b' to make a ko.]
 (;B[re]
 ;W[rd]LB[qe:a][dp:b]C[Black may continue locally with 'a' for thickness, though this is not played early in the game.
 'b' shows White's continuation locally (after Black tenuki).]
 (;B[qe]
 ;W[pd]
 ;B[pe]
 ;W[]C[White plays elsewhere.]
 ;B[ob]C[Black 13 is sente.]
 ;W[pb]
 ;B[nb]
 ;W[rb]C[White 16 is necessary to live.])
 (;B[]C[Black plays elsewhere.]
 ;W[pe]C[White 10 is normally vulgar style.]
 ;B[of]
 ;W[qf]
 ;B[qg]
 ;W[rf]CR[pg]LB[rg:b][oh:a]C[Black continues with 'a' or, if the cut at the marked spot is no problem, 'b'.]
 (;B[oh])
 (;B[rg]CR[pg]C[To play this way, Black must not be worried about a cut at the marked location.])))
 (;B[rf]C[Anything White would reply would be submissive, so naturally White plays elsewhere.]
 ;W[]C[White plays elsewhere.]
 ;B[rb]C[Black 9 is the obvious torment.]
 ;W[rc]
 ;B[qb]
 ;W[re]LB[pd:a][qe:b]C[Black continues with 'a'. Black 'b' is from professional play, but is not recommended.]
 (;B[pd]
 ;W[qc]
 ;B[qe]LB[nb:b][sb:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[sb]
 ;B[se]
 ;W[ra]
 ;B[qa]
 ;W[pb]
 ;B[sa]C[Ko])
 (;W[nb]C[White 16 is not recommended.]
 ;B[mb]
 ;W[sf]
 ;B[sg]
 ;W[se]
 ;B[rg]
 ;W[sb]
 ;B[sd]
 ;W[rd]
 ;B[ob]
 ;W[pb]
 ;B[na]
 ;W[pa]))
 (;B[qe]C[Black 13 was played by Hashimoto Shoji against Rin Kaiho in the 1965 Meijin league. This sequence is a mistake.]
 ;W[pe]
 ;B[qf]
 ;W[pd]
 ;B[nb]
 ;W[oe]
 ;B[ng]
 ;W[ne]
 ;B[me]
 ;W[ob]
 ;B[mf]
 ;W[sd]
 ;B[sf]
 ;W[sb]
 ;B[se]
 ;W[rd]
 ;B[qa]
 ;W[pa]C[Black can get a ko on the 1-1 point.]MA[sa])))
 (;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qi]))
 (;B[md]LB[oe:c][qf:b][dp:a]C[
 * Joseki *
 White continues by playing elsewhere (a). Local continuations at 'b' and 'c' are shown.]
 (;W[]C[White plays elsewhere.]
 (;B[re]
 ;W[rd])
 (;B[rf]C[Possible, but gote against the corner. Black cannot kill the corner, even if White plays tenuki.]))
 (;W[qf]C[White 8 is not recommended. Black gets good shape for small White profit.]
 ;B[qg]LB[rf:A][pg:B]C['a' or 'b'.]
 (;W[rf]
 ;B[pd]
 ;W[qc]
 ;B[ph])
 (;W[pg]
 ;B[of]
 ;W[rf]
 ;B[qh]))
 (;W[oe]C[White 8 is a mistake.]
 ;B[pe]
 ;W[pd]LB[nd:b][of:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[of]LB[nd:a][ne:b]C[White 'a' and 'b' are both bad.]
 (;W[nd]
 ;B[ne]
 ;W[od]
 ;B[me]C[White has achieved nothing.])
 (;W[ne]LB[nd:b][mf:a]C[Black continues with 'a' to seal White in, or 'b' to create a target of White stones running to the center.]
 (;B[mf]
 ;W[nd]
 ;B[mc])
 (;B[nd]
 ;W[me]
 ;B[ld]
 ;W[le]
 ;B[kd]
 ;W[mg]
 ;B[re]
 ;W[rd]
 ;B[oh])))
 (;B[nd]C[Black 11 is what White was hoping for.]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]C[White gets an efficient result.])))
 (;B[nb]LB[nd:b][rf:a][dp:c]C[White continues with 'a' or 'b'. Playing elsewhere ('c') is a mistake.]
 (;W[rf]
 ;B[ng]LB[ic:a][nd:b]C[White continues with a checking extension, such as 'a'. Because of Black 9, a White cut at 'b' only strengthens Black.]
 (;W[ic]
 ;B[rg]LB[re:a][qg:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[re]
 ;B[qg])
 (;W[qg]C[White 12 is an overplay.]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]LB[rd:b][qe:a]C[Black continues with 'a'. Black 'b' is tough, and trouble.]
 (;B[qe]
 ;W[rd]
 ;B[se]
 ;W[rb]
 ;B[pg]
 ;W[ph]
 ;B[qi]
 ;W[qh]
 ;B[qk])
 (;B[rd]C[Black 17 is not recommended.]
 ;W[rc]
 ;B[qe]
 ;W[pd]
 ;B[rb]
 ;W[oe]
 ;B[nd]
 ;W[of]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[pe]
 ;B[oh]
 ;W[me]
 ;B[qb]
 ;W[mf]
 ;B[kc])))
 (;W[nd]C[White 10 is a mistake.]
 ;B[md]
 ;W[ne]
 ;B[me]
 ;W[oe]
 ;B[pe]
 ;W[pd]
 ;B[nf]))
 (;W[nd]LB[pd:a][nf:b]C[Black continues with 'a' or 'b'.
 Black 'a' results in split groups and fighting.
 Black 'b' gives up the corner for the right side.]
 (;B[pd]
 ;W[qc]LB[md:b][nf:a]C[Black continues with 'a' or 'b'. Both result in split groups and continued fighting.]
 (;B[nf]
 ;W[md]
 ;B[lc])
 (;B[md]
 ;W[ne]
 ;B[of]
 ;W[nf]
 ;B[re]
 ;W[ng]LB[ob:b][ph:a]C[Black continues with 'a'. Black 'b', capturing the corner, is a mistake.]
 (;B[ph]
 ;W[ob]
 ;B[kc]
 ;W[qe]
 ;B[qf]
 ;W[ni]
 ;B[pk])
 (;B[ob]C[Black 17, capturing the corner, is a mistake.]
 ;W[qg]
 ;B[rg]
 ;W[rh]
 ;B[rf]
 ;W[pg]
 ;B[rd]LB[og:a]C[White 'a' is sente, so White builds a wall of steel.])))
 (;B[nf]
 ;W[md]
 ;B[pd]
 ;W[mc]
 ;B[qc]
 ;W[qb]
 ;B[rc]
 ;W[ob]
 ;B[rb]
 ;W[mb]))
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[re]
 ;W[rd]
 ;B[qe]
 ;W[pd]
 ;B[oe]
 ;W[ob]
 ;B[]C[Black plays elsewhere.]
 ;W[pe]C[If White plays 14....]
 ;B[of]
 ;W[qf]
 ;B[qg]C[Black gives up the two stones.])))
 (;B[pd]
 ;W[pc]LB[qc:a][qe:b]C[Black continues with 'a' or 'b'.
+]
 (;B[qc]LB[qb:c][rc:a][qe:b]C[White 'a' is joseki. White 'b' is a trick play. White 'c' is a mistake.
 R17: popular in the past, but now outdated. R15: modern joseki.]
 (;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[qe]
 ;W[rd]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[md]
 ;W[ne]
 ;B[nd]C[
 * Joseki *])
 (;W[qe]LB[qb:c][rc:a][qf:b]C[White 8 is a trick play.
 Black continues with 'a'. Played correctly, Black gets a "flower-viewing" ko.
 Black is tricked if he plays at 'b' or 'c'.]
 (;B[rc]LB[nc:c][rd:b][qf:a]C[White may try 'a' or 'b'. Neither work if Black plays correctly.
 'c' is very bad.]
 (;W[qf]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[qb]
 ;B[rb]LB[ob:A][pb:B]C[Neither 'a' nor 'b' help.]
 (;W[ob]
 ;B[mc]
 ;W[ra]LB[na:B][pa:A]C['a' makes a direct ko and is correct. 'b' only makes a two step ko.]
 (;B[pa]LB[qa:a][rd:b]C[White may try 'a' or 'b'. Both result in ko.]
 (;W[qa]
 ;B[na]
 ;W[pb]
 ;B[ma]
 ;W[oa]
 ;B[sa]
 ;W[sb]
 ;B[sc])
 (;W[rd]
 ;B[qa]
 ;W[sb]
 ;B[sa]))
 (;B[na]
 ;W[pa]
 ;B[ma]
 ;W[oa]
 ;B[sa]
 ;W[sb]
 ;B[sc]
 ;W[rd]))
 (;W[pb]
 ;B[oa]LB[mc:A][nd:B]C[Neither 'a' or 'b' help.]
 (;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[ob]
 ;W[ma]
 ;B[qa])
 (;W[nd]
 ;B[mc]
 ;W[of]
 ;B[ne]
 ;W[pe]
 ;B[md]
 ;W[oe]
 ;B[nd])))
 (;W[rd]
 ;B[qb]LB[nc:a][qf:b]C['a' and 'b' are miai. Black's reply (at 'b') to White 'a' is less obvious (than White 'b', Black 'a').]
 ;W[nc]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[sf]
 ;W[re]
 ;B[pg]
 ;W[qh]
 ;B[rh]LB[pe:B][qi:A][ri:C]C['a', 'b' or 'c' don't work.]
 (;W[qi]
 ;B[sd])
 (;W[pe]
 ;B[oe]
 ;W[of]
 ;B[sd])
 (;W[ri]
 ;B[qi]
 ;W[ph]
 ;B[rj]
 ;W[pe]
 ;B[oe]
 ;W[of]
 ;B[og]
 ;W[nf]
 ;B[sd]))
 (;W[nc]
 ;B[qf]))
 (;B[qf]CR[rc]C[Black 9 is a mistake. Black should have played at the red dot.]
 ;W[rc]LB[qb:a][nc:b]C[Black 'a' is better than 'b'.]
 (;B[qb]
 ;W[rb]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[nf])
 (;B[nc]
 ;W[qb]
 ;B[nd]LB[pe:A]C[White aji to cut at 'a'.]))
 (;B[qb]
 ;W[nc]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[rc]
 ;B[rb]
 ;W[rd]LB[sb:B][sc:A]C['a' is correct. 'b' is a mistake.]
 (;B[sc]
 ;W[sb]
 ;B[sa]
 ;W[se]
 ;B[pe]
 ;W[pb]
 ;B[qa]
 ;W[nd]LB[qg:A]C[White aji to cut at 'a'.])
 (;B[sb]
 ;W[pe]
 ;B[oe]
 ;W[of])))
 (;W[qb]C[White 8 is a mistake in style.]
 ;B[rc]LB[rb:a][nc:b]C[White continues with 'a' or 'b'. White 'b' somewhat salvages the situation.]
 (;W[rb]
 ;B[rd]
 ;W[nd]LB[nc:b][qe:a][dp:c]C[Black 'a' is good enough. Black 'b' wreaks havoc on White, but Black must have the ladder to play 'b'. Black may also play elsewhere ('c').]
 (;B[qe]
 ;W[mc])
 (;B[nc]C[Black must have the ladder to play this way.]
 ;W[mc]
 ;B[nb]
 ;W[ob]
 ;B[oa]
 ;W[pb]
 ;B[mb]
 ;W[ne]
 ;B[of]
 ;W[lc]
 ;B[lb]LB[kb:a][kc:b]C[Neither White 'a' nor 'b' work.]
 (;W[kb]
 ;B[kc]
 ;W[jb]
 ;B[md]
 ;W[ld]
 ;B[me]
 ;W[nf]
 ;B[jc]
 ;W[la]
 ;B[le])
 (;W[kc]
 ;B[sb]))
 (;B[]C[Black plays elsewhere. This variation illustrates that White cannot pull out White 2 by playing at the marked spot.]MA[qe]
 ;W[qe]C[White 13 does not work.]
 ;B[re]
 ;W[qf]
 ;B[qg]))
 (;W[nc]C[White cuts his losses.]
 ;B[rb]
 ;W[nd]
 ;B[of]
 ;W[jc])))
 (;B[qe]LB[qc:B][rc:C][rd:A]C[White continues with 'a', 'b', or 'c'.
+]
 (;W[rd]LB[nc:b][qc:a]C[Black continues with 'a' or 'b'.
 Some professionals think, that 'a' is advantageous for White, and play only 'b'.
+]
 (;B[qc]LB[qb:a][rc:b][re:c]C[White continues with 'a' or 'b'. 'c' is questionable.
+]
 (;W[qb]
 ;B[re]
 ;W[rc]
 ;B[md])
 (;W[rc]LB[qb:A][nc:B]C['a' is correct, though Lee Changho recommended 'b' here.]
 (;B[qb]
 ;W[rb]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[md]
 ;W[ne]
 ;B[nd])
 (;B[nc]LB[pb:a][qb:b]C[White continues with 'a' or 'b'.]
 (;W[pb]
 (;B[me]LB[md:a]C[Black 13 can also be at 'a', depending whether Black wants to emphasize the center or the top.])
 (;B[ob]
 (;W[qb]
 ;B[md]C[Suggested by Lee Changho, but better for Black compared to sacrifising 2 stones.])
 (;W[nb]
 ;B[mc]C[Joseki too. Black has useful sente moves here.])))
 (;W[qb]
 ;B[ob]
 ;W[pb]
 ;B[md]
 ;W[ne]
 ;B[nd])))
 (;W[re]
 ;B[qb]LB[pb:A][qf:B]C[If 'a', White is enclosed in the corner. If 'b', White gets the right, Black gets the top side.]
 (;W[pb]
 ;B[nc]
 ;W[nb]
 ;B[pa]
 ;W[ob]
 ;B[mc]
 ;W[mb]
 ;B[rf]
 ;W[rb]
 ;B[lc])
 (;W[qf]
 ;B[nc]
 ;W[pe]
 ;B[oe]
 ;W[pg]
 ;B[of])))
 (;B[nc]LB[nb:a][re:b]C[
 White continues with 'a', possibly 'b'.
+]
 (;W[nb]LB[mb:b][mc:a]C[Black continues with 'a' to enlargen the wall. Black 'b' takes the corner for the top side.]
 (;B[mc]
 ;W[mb]
 ;B[lc])
 (;B[mb]
 ;W[mc]
 ;B[nd]
 ;W[lb]
 ;B[ob]
 ;W[ma]LB[pb:b][qc:a]C[Black 'a' and Black yields White 2 and 8 in gote. Black 'b' is a complete loss.]
 (;B[qc]
 ;W[pb]
 ;B[rc])
 (;B[pb]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[re]
 ;W[oa]
 ;B[sd]
 ;W[rc]
 ;B[qa]
 ;W[na])))
 (;W[re]LB[nd:b][rf:a]C[Black continues with 'a' to emphasize the top, 'b' to secure the right side.
 Black 'a' and White cuts at 'b'.]
 (;B[rf]LB[nb:b][nd:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[nd]C[White's cut provokes a fight.]
 ;B[mc]LB[md:b][ne:a]C[White continues with 'a', possibly 'b'.]
 (;W[ne]C[If White chooses to activate the stone for a fight.]
 ;B[kd]
 ;W[of]
 ;B[pe]
 ;W[lf]
 ;B[og]
 ;W[ng]
 ;B[oh])
 (;W[md]
 ;B[ld]
 ;W[nf]))
 (;W[nb]C[White 12 is not recommended, especially if Black has a favorable ladder to the top left.]
 ;B[mb]
 ;W[mc]
 ;B[nd]
 ;W[ob]LB[lb:b][lc:a]C[Black plays 'a' to catch 14 in a ladder, or 'b' if the ladder is unfavorable.]
 (;B[lc]C[Assuming Black has the ladder.])
 (;B[lb]CR[lc]C[If Black cannot capture White 14 in a ladder.
 The continuation depends upon local support. Without support, White cannot afford toward the direction of the marked stone. Typically White would not put White 14 into play until later.])))
 (;B[nd]
 ;W[qg]))))
 (;W[qc]LB[nc:C][md:B][nd:A]C['a' and 'b' are joseki.
 'c' is tough-minded; the most attractive way, but complicated.]
 (;B[nd]
 ;W[mc]
 ;B[le]
 ;W[lc]C[
 * Joseki *
 There is a small avalanche variation which results in the same shape of stones, but here the color of the outside wall has sente, while in the nadare variation it is the color of the upper side territory.])
 (;B[md]
 ;W[nd]LB[nc:B][ne:A]C['a' is joseki, 'b' is disadvantageous.]
 (;B[ne]
 ;W[nc]
 ;B[me]
 ;W[lc]LB[kd:a]C[
 * Joseki *
 Locally, 'a' is the next play for either player.])
 (;B[nc]
 ;W[ne]
 ;B[nb]
 ;W[of]
 ;B[pe]
 ;W[ob]
 ;B[lc]
 ;W[pg]
 ;B[qg]
 ;W[ph]))
 (;B[nc]LB[nb:C][mc:A][nd:B]C[Black 9 is tough-minded, but the outcomes do not necessarily favor Black.
 One result is giving White influence while struggling for life underneath; a change from Black's original strategy.
 White must reply carefully.
 White continues with 'a' or 'b'. White 'c' is submissive.]
 (;W[mc]C[White 10 is a mistake.]
 ;B[nb]
 ;W[nd]
 ;B[lc]
 ;W[ne]
 ;B[mb]
 ;W[of]
 ;B[pe]LB[pg:B][ph:A]C['a' is correct, 'b' is nonsense.]
 (;W[ph]
 ;B[og]
 ;W[ng])
 (;W[pg]
 ;B[qg]
 ;W[qh]
 ;B[rf]
 ;W[rg]
 ;B[rd]
 ;W[rc]
 ;B[og]
 ;W[qf]
 ;B[nf]))
 (;W[nd]LB[nb:B][mc:A]C[At best, Black ends up giving White thickness while Black crawls along the third line to make life of a group started by Black
 .
 'a' is correct. 'b' is a mistake.]
 (;B[mc]
 ;W[ne]
 ;B[of]LB[kd:a][ld:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[kd]LB[ob:b][kc:a]C[Black may try 'a' or 'b'.]
 (;B[kc]
 ;W[ld]
 ;B[lc]LB[jc:b][jd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[jd]
 ;B[ic]
 ;W[id]
 ;B[hc]
 ;W[ge])
 (;W[jc]C[White 18 is a mistake.]
 ;B[jd]
 ;W[ic]
 ;B[md]
 ;W[me]
 ;B[le]
 ;W[ke]
 ;B[lf]))
 (;B[ob]
 ;W[pb]
 ;B[le]
 ;W[ld]
 ;B[md]
 ;W[me]
 ;B[lf]
 ;W[lc]
 ;B[lb]
 ;W[kb]LB[mb:b][nb:c][mf:a]C[Black 'a', the only viable play, lets White connect his two groups.
 White 'b' and 'c' are the same mistake, and White wins the capturing
 race.]
 (;B[mf]C[Black 25 lets White connect his two groups.]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[nf]
 ;W[la]
 ;B[oe]
 ;W[ma]C[This quality of this result for either side depends upon surrounding stones. Certainly if Black wanted thickness, the original strategy, there was a better way to go about it.])
 (;B[mb]C[Also see variation 3 for a different take on the same mistake.]
 ;W[la]
 ;B[na]
 ;W[ka]
 ;B[mf]
 ;W[ma])
 (;B[nb]C[Also see variation 2 for a different take on the same mistake.]
 ;W[oa]
 ;B[na]
 ;W[pa]
 ;B[mf]
 ;W[ma])))
 (;W[ld]LB[kb:D][kc:A][lc:C][md:B]C[White 14 is a mistake.
 'a' or 'b' are correct. 'c' and 'd' are mistakes.]
 (;B[kc])
 (;B[md]
 ;W[me]
 ;B[le]
 ;W[ob]
 ;B[kd]
 ;W[lf]
 ;B[ke]
 ;W[mg]
 ;B[pj])
 (;B[lc]C[Pushing from behind.]
 ;W[kd])
 (;B[kb]C[Too low.]
 ;W[lf])))
 (;B[nb]
 ;W[of]
 ;B[pg]
 ;W[ne]
 ;B[pe]
 ;W[lc]))
 (;W[nb]C[White 10 is submissive.]
 ;B[mc]
 ;W[mb]
 ;B[lc]C[Great result for Black])))
 (;W[rc]
 ;B[rd]
 ;W[qc]
 ;B[nd]
 ;W[mc]C[Joseki])))
 (;B[pc]C[Black must have a ladder off 3 to play this way.]
 ;W[pd]LB[nc:b][qc:a]C[Black may continue at 'a'.
 'b' is a trick play.]
 (;B[qc]LB[nc:b][rc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rc]
 ;B[rb]LB[nc:b][rd:a]C[White continues with 'a' or 'b'. White 'a' is fighting.
 White 'b' is the peaceful variation to avoid all difficulties, but an unpleasant loss in the local context.]
 (;W[rd]
 ;B[ob]
 ;W[nc]LB[nb:a][sb:b]C[Black continues with 'a' or 'b'.]
 (;B[nb]LB[mc:a][oe:b]C[White continues with 'a' or 'b'.]
 (;W[mc]
 ;B[oe]
 ;W[sb]
 ;B[qb]LB[mb:b][qg:a]C[White continues with 'a'. White 'b' is a tempting mistake.]
 (;W[qg]LB[lc:b][ph:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[ph]LB[kc:a][ld:b]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[kc]LB[mb:a][qf:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[mb]
 ;W[lb]LB[ma:b][ld:a]C[Black continues with 'a'. Black 'b' misses a good moment to peep at 'a' without reason.]
 (;B[ld]
 ;W[lc]
 ;B[ma]LB[qf:a][qh:c][rh:b]C[White continues with 'a' or 'b'. White 'c' is vulgar.]
 (;W[qf]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[pg]
 ;B[og]
 ;W[oh]LB[ng:A][rg:B]C[The ladder must be favorable for Black because of White 32.
 'a' is correct. Trying to kill on 'b' doesn't work.]
 (;B[ng]LB[rg:B][sg:A]C[White lives with 'a'. If 'b', White dies.]
 (;W[sg]
 ;B[oi]
 ;W[hc]
 ;B[nh]LB[pe:A]C[Later, Black 'a' is sente.]
 ;B[pe]LB[qe:B][rf:A]C[White lives on 'a' and dies on 'b'. If White tenuki, Black kills on 'b'.]
 (;W[rf])
 (;W[qe]
 ;B[rf]
 ;W[re]
 ;B[sc]
 ;W[sd]
 ;B[sf])
 (;B[qe]
 ;W[re]
 ;B[rf]
 ;W[rg]
 ;B[sc]
 ;W[sd]
 ;B[sf]))
 (;W[rg]
 ;B[qj]
 ;W[hc]
 ;B[pe]LB[qe:A][sf:B]C['a' or 'b' are no help.]
 (;W[qe]
 ;B[sh]
 ;W[sf]
 ;B[sc]
 ;W[sd]
 ;B[re])
 (;W[sf]
 ;B[re]
 ;W[qe]
 ;B[sh]
 ;W[se]
 ;B[sc])))
 (;B[rg]
 ;W[rf]
 ;B[sh]
 ;W[ng]
 ;B[of]LB[mf:A][nf:B]C['a' or 'b'.]
 (;W[mf]
 ;B[nh]
 ;W[oi]
 ;B[me]
 ;W[lf]LB[kd:A][ke:B][le:C]C['a', 'b', 'c' don't escape.]
 (;B[kd]
 ;W[ne]
 ;B[nf]
 ;W[mg]
 ;B[nd]
 ;W[md]
 ;B[le]
 ;W[pe]
 ;B[ne]
 ;W[jd]
 ;B[ke]
 ;W[jf])
 (;B[ke]
 ;W[le]
 ;B[md]
 ;W[kd])
 (;B[le]
 ;W[kf]
 ;B[jd]
 ;W[kd]
 ;B[ke]
 ;W[je]
 ;B[jf]
 ;W[ie]
 ;B[jc]
 ;W[jb]
 ;B[nf]
 ;W[mg]
 ;B[ib]
 ;W[ne]
 ;B[nd]
 ;W[md]))
 (;W[nf]
 ;B[ne]
 ;W[me]
 ;B[nh]
 ;W[oi]
 ;B[mf]
 ;W[mg]
 ;B[md]
 ;W[le]
 ;B[lf]
 ;W[ke]
 ;B[mh]
 ;W[lg]
 ;B[kf]
 ;W[nd])))
 (;W[rh]LB[pg:A][qh:B]C[Black continues with 'a' or 'b'. Black 'a' emphasizes the top.
 Black 'b' emphasizes the right.]
 (;B[pg]
 ;W[qj]
 ;B[hc])
 (;B[qh]
 ;W[rf]
 ;B[qj]
 ;W[ri]
 ;B[oj]
 ;W[hc]))
 (;W[qh]C[White 26 is a vulgar move.]
 ;B[re]
 ;W[qe]LB[qf:a][qi:b]C[Black continues with 'a' to emphasize the right side, or 'b' to emphasize the top.]
 (;B[qf]C[Black plays 29 to emphasize the right side.]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[qi]
 ;W[rh]
 ;B[ri]
 ;W[pi]
 ;B[pg]
 ;W[sg]
 ;B[qk])
 (;B[qi]C[Black plays 29 to emphasize the top.]
 ;W[qf]
 ;B[pi]
 ;W[ri]
 ;B[rj]
 ;W[sh]
 ;B[hc])))
 (;B[ma]C[Black 23 is not too early.]
 ;W[qf]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[pg]
 ;B[og]
 ;W[oh]LB[ng:A][rg:B]C['a' is usual, Trying to kill with White on 'b' fails.]
 (;B[ng]
 ;W[sg]
 ;B[oi]
 ;W[hc]
 ;B[ld]LB[lc:B][ed:A]C[As this peep is played later compared to the more advantageous variation, White may more likely play tenuki (e.g., on 'a').
 Playing 'b' is just saving points without influencing the status of the Black center group.]
 (;W[ed]
 ;B[nh]
 ;W[dp]
 ;B[lc]C[Later]
 ;W[cd]
 ;B[jb]
 ;W[kb]
 ;B[jc]
 ;W[jd]
 ;B[kd]
 ;W[ic]
 ;B[je]
 ;W[id]
 ;B[ka]
 ;W[ib]
 ;B[la]C[Both sides gained the same amount of territory, but White has an elsewhere move and sente to counter the influence Black developed.])
 (;W[lc]
 ;B[nh]C[Same result as joseki.]))
 (;B[rg]C[Black 31 is a trick play.]
 ;W[rf]
 ;B[sh]
 ;W[ng]
 ;B[of]LB[mf:a][nf:b][mg:c]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[mf]LB[md:a][nh:b]
 (;B[md]
 ;W[lf]
 ;B[ld]
 ;W[lc]
 ;B[nh]
 ;W[oi]LB[kd:B][nd:A]C['a' and 'b' are miai now.])
 (;B[nh]
 ;W[oi]
 ;B[me]
 ;W[lf]
 ;B[le]
 ;W[kf]
 ;B[ke]
 ;W[je]
 ;B[jf]
 ;W[kd]
 ;B[ni]
 ;W[oj]LB[jg:b][kg:a][mg:c]C[Black may try 'a', 'b' or 'c'. Neither work.]
 (;B[kg]
 ;W[jg]
 ;B[if]
 ;W[mh])
 (;B[jg]
 ;W[lh]
 ;B[ne]
 ;W[kh]LB[jd:a][sf:b]C[Black may try 'a' or 'b'. White wins by a move either way.]
 (;B[jd]
 ;W[ie]
 ;B[id]
 ;W[he]
 ;B[jb]
 ;W[pe]
 ;B[kb]
 ;W[nf]
 ;B[la]
 ;W[ld])
 (;B[sf]
 ;W[nf]
 ;B[re]
 ;W[qe]
 ;B[se]
 ;W[ld]
 ;B[sd]
 ;W[md]))
 (;B[mg]
 ;W[nf]
 ;B[kg]
 ;W[jg]
 ;B[if]
 ;W[lg]
 ;B[kh]
 ;W[lh]
 ;B[li]
 ;W[ki]
 ;B[jh]
 ;W[mi]
 ;B[lj]
 ;W[nj])))
 (;W[nf]LB[md:a][ne:b]C[White 36 is a mistake.
 Black escapes with 'a'. Black 'b' is a mistake.]
 (;B[md]
 ;W[ld]
 ;B[me]LB[lf:a][lg:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[lf]
 ;B[mf]
 ;W[mg]
 ;B[lg]LB[le:a][nh:b]C['a' and 'b' are miai. Black is out, and the White group at the bottom right dies.])
 (;W[lg]
 ;B[nh]
 ;W[oi]
 ;B[mg]LB[mf:b][mh:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[mh]
 ;B[mf]
 ;W[ni]
 ;B[ke]
 ;W[le]
 ;B[nd]
 ;W[lc]
 ;B[lf])
 (;W[mf]
 ;B[le])))
 (;B[ne]
 ;W[me]
 ;B[md]LB[ld:B][le:A]C['a' is correct. 'b' is a mistake.]
 (;W[le]
 ;B[ld]
 ;W[kd]
 ;B[nh]
 ;W[oi]
 ;B[lg]
 ;W[mf]
 ;B[ke]
 ;W[pe])
 (;W[ld]
 ;B[nh]
 ;W[oi]
 ;B[mf])))
 (;W[mg]
 ;B[me]
 ;W[lf]
 ;B[kd]
 ;W[ld]
 ;B[le]
 ;W[ke]
 ;B[kf]
 ;W[jd]
 ;B[nh]
 ;W[oi]
 ;B[lg]))))
 (;B[qf]C[Black 21 is a mistake]
 ;W[rf]
 ;B[rh]
 ;W[rg]
 ;B[qh]
 ;W[pa]))
 (;W[ld]C[White 20 is an overplay.]
 ;B[mb]
 ;W[lb]
 ;B[kc]
 ;W[lc]
 ;B[ma]))
 (;B[lc]C[White 19 is not recommended.]
 ;W[mb]
 ;B[lb]
 ;W[me]
 ;B[ma]
 ;W[ld]LB[jc:a][kd:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[jc]
 ;W[jd]
 ;B[ic]
 ;W[qh]
 ;B[mf]C[If Black tries 29....]
 ;W[ke])
 (;B[kd]LB[ke:b][mf:a]C[Black 25 is not recommended. White continues with 'a'. White 'b' is a careless mistake.]
 (;W[mf]
 ;B[jc]
 ;W[qh])
 (;W[ke]C[White 26 is a mistake.]
 ;B[md]
 ;W[nd]
 ;B[ne]
 ;W[md]
 ;B[mf]
 ;W[le]
 ;B[jd]))))
 (;W[mb]LB[pa:a][qe:b]C[White 18 is a mistake. Black continues with 'a'. Black 'b' is a trick play that can be foiled.]
 (;B[pa]
 ;W[qg]
 ;B[jc]C[Black 21 deprives the White stones of a base. This move is the reason White 18 is a mistake.]
 ;W[le]
 ;B[ph])
 (;B[qe]LB[pa:b][rf:a]C[Black 19 is a trick play. White continues with 'a'. White 'b' is a mistake.]
 (;W[rf]
 ;B[re]
 ;W[se]
 ;B[qg]
 ;W[pa]
 ;B[ra]
 ;W[pb]
 ;B[rg]
 ;W[na])
 (;W[pa]C[White 20 is a mistake.]
 ;B[ra]LB[pb:a][rf:b]C[White may try 'a' or 'b'. Neither work.]
 (;W[pb]
 ;B[re])
 (;W[rf]
 ;B[re]
 ;W[se]
 ;B[rg]LB[sc:b][qf:a]C[White may try 'a' or 'b'. Neither work.]
 (;W[qf]
 ;B[pe]
 ;W[qg]
 ;B[sd]C[Black 29 drives the last nail in White's coffin.]
 ;W[sc]
 ;B[sa])
 (;W[sc]
 ;B[oa]))))))
 (;W[oe]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jc]LB[sb:a][jd:c][qf:b]C[Black continues with 'a' to live in the corner, or 'b' for thickness, while possibly sacrificing the corner.
 Black 'c' is a mistake.]
 (;B[sb]LB[pe:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[pe]
 ;B[jd]
 ;W[id]
 ;B[ie]
 ;W[hd]LB[qf:a][pg:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[qf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[mf])
 (;B[pg]C[Black 29 is an all-out play, but unreasonable. Black must have the ladder to play this way. White gets and favorable result, and Black ends in gote.]
 ;W[nf]
 ;B[ng]
 ;W[mf]
 ;B[mg]
 ;W[lf]
 ;B[kg]
 ;W[lg]
 ;B[lh]
 ;W[kh]
 ;B[kf]
 ;W[mh]LB[of:b][li:a]C[Black continues with 'a' or 'b'.]
 (;B[li]
 ;W[og]
 ;B[nh]
 ;W[oh]
 ;B[ni]
 ;W[ph]
 ;B[pj]
 ;W[rh]
 ;B[jh])
 (;B[of]
 ;W[li]
 ;B[ne]
 ;W[pi]
 ;B[rf]LB[ig:a]C['a' is the vital point of this shape: White's next move, if White plays in the center.])))
 (;W[qg]
 ;B[jd]
 ;W[id]
 ;B[ie]
 ;W[hd]
 ;B[qf]
 ;W[rf]
 ;B[re]LB[qe:b][rg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rg]
 ;B[qe]
 ;W[of]
 ;B[pg]
 ;W[pe]
 ;B[se]
 ;W[mf]
 ;B[kf]
 ;W[mh]
 ;B[pi])
 (;W[qe]C[White 32 is a mistake.]
 ;B[rg]
 ;W[se]
 ;B[qh])))
 (;B[qf]
 ;W[sb]LB[qa:a][ra:b]C[Black continues with 'a', and faces a ko. Black 'b' is a mistake.]
 (;B[qa]C[Black faces a ko.]
 ;W[ra]
 ;B[sa]
 ;W[pe]LB[sc:a][ng:b]C[Black continues with 'a' or 'b'. Black 'a' is the easy way out.
 Black 'b' is tough-minded.]
 (;B[sc]
 ;W[of])
 (;B[ng]C[Black 29 to fight the corner ko. Without other ko threats, Black loses, but gets thickness, giving what is considered an equal result.]
 ;W[ra]
 ;B[qb]
 ;W[pa]
 ;B[sa]
 ;W[of]
 ;B[og]
 ;W[ra]
 ;B[pb]
 ;W[mb]
 ;B[sa]
 ;W[sc]
 ;B[re]
 ;W[jd]
 ;B[nf]
 ;W[na]C[White captures, Black builds thickness. The result is considered equal.]))
 (;B[ra]C[Black 25 is a mistake; the Black corner stones will die.]
 ;W[pe]
 ;B[ng]
 ;W[pb]
 ;B[qb]
 ;W[pa]))
 (;B[jd]LB[sb:a][id:b]C[Black 23 is a rash mistake.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[sb]
 ;B[qa]
 ;W[ic]C[Now Black faces a ko in the corner.]
 ;B[qf]C[The following is from game 3 of the 1952 Honinbo Title between Hashimoto Utaro (White) and Takagawa (Black).]
 ;W[pe]
 ;B[ng]
 ;W[of]
 ;B[og]
 ;W[qh]
 ;B[re]
 ;W[ra]
 ;B[sa]
 ;W[rg]
 ;B[rf]
 ;W[ra]
 ;B[qb]
 ;W[pa]
 ;B[sa]
 ;W[se]
 ;B[ph]
 ;W[ra]
 ;B[pb]
 ;W[sf]
 ;B[qj]
 ;W[qi]
 ;B[pj]
 ;W[pi]
 ;B[oi]
 ;W[oj]
 ;B[ni]
 ;W[rj]
 ;B[rk]
 ;W[ri]
 ;B[ql]C[The remains unresolved, and the White group at right cannot live without winning the ko.])
 (;W[id]C[White 24 is a mistake.]
 ;B[ic]C[Black 25 starts a sacrifice.]
 ;W[hc]
 ;B[ib]
 ;W[hb]
 ;B[jb]
 ;W[kb]
 ;B[ie]
 ;W[hd]
 ;B[mb]C[Now Black lives in the corner.]
 ;W[ia]
 ;B[qf]C[Black 35 captures the White stones.]
 ;W[pe]
 ;B[ng]))))
 (;B[sb]C[Black 13 is a special strategy, and something of a trick play.]
 ;W[nb]LB[pb:a][oe:b]C[Black continues with 'a' or 'b'.]
 (;B[pb]
 ;W[oa]
 ;B[qa]LB[kc:b][oe:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oe]
 ;B[nd]LB[lc:a][me:b]C[White continues with 'a' to have the White stones at top live, or 'b' to sacrifice the top White stones for magnificant thickness on the right and center.]
 (;W[lc]LB[md:a][ne:b][pe:c]C[Black continues with 'a' to 'c'.]
 (;B[md]
 ;W[pe]
 ;B[mf]
 ;W[ld]
 ;B[ng]
 ;W[qg]LB[of:a][qf:b]C[White 26 is a stylish move that takes care of the White stones.
 If Black 'a', White 'b'.
 White is established on both sides, while Black's center stones are floating.])
 (;B[ne]LB[of:b][qf:a]C[White continues with 'a'. White 'b', a sacrifice play, comes from a professional game.]
 (;W[qf]LB[pg:a][qg:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[pe]
 ;B[nf]
 ;W[ri]CR[of]C[Black still has the marked point to worry about.])
 (;B[qg]C[Black 23 is a mistake.]
 ;W[of]))
 (;W[of]C[White 22 was played by Magari against Nakamura Yutaro in the 1958 4th Top Position Title League.]
 ;B[pe]
 ;W[og]
 ;B[pg]
 ;W[ph]
 ;B[re]
 ;W[oh]
 ;B[mf]
 ;W[qe]
 ;B[rf]
 ;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[sf]
 ;B[ri]
 ;W[se]
 ;B[pk]
 ;W[jd]
 ;B[mh]
 ;W[lg]
 ;B[mg]
 ;W[ni]
 ;B[qm]
 ;W[nk]
 ;B[jg]
 ;W[om]))
 (;B[pe]LB[of:b][qf:a]C[White continues with 'a' to save the White stones at lower right, or 'b' to sacrifice those stones to build thickness.]
 (;W[qf]
 ;B[pg]
 ;W[me]
 ;B[ne]
 ;W[nf]
 ;B[md]
 ;W[ld]
 ;B[of]
 ;W[mc]
 ;B[oe]
 ;W[qg]
 ;B[ph]
 ;W[ri]
 ;B[mf]
 ;W[le]
 ;B[ng]C[After getting such thickness at top, White does not mind Black's ponnuki shape.]
 ;W[qj])
 (;W[of]
 ;B[md]
 ;W[pg]
 ;B[qf]
 ;W[qg]
 ;B[rf]
 ;W[rg]
 ;B[se]
 ;W[og])))
 (;W[me]C[White plays 20 to build thickness (while sacrificing the stones at top).]
 ;B[md]
 ;W[ld]
 ;B[lc]
 ;W[ne]
 ;B[mc]
 ;W[pe]LB[kc:a]C['a' is the vital point for either player.]))
 (;W[kc]C[White 18 is a mistake.]
 ;B[oe]
 ;W[qg]
 ;B[qf]
 ;W[rf]
 ;B[re]LB[qe:B][rg:A]
 (;W[rg]
 ;B[qe]
 ;W[se]
 ;B[sd]
 ;W[sc]
 ;B[pe])
 (;W[qe]
 ;B[se])))
 (;B[oe]LB[oa:a][pb:c][qg:b]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[oa]
 ;B[qb]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[qf]
 ;W[re]
 ;B[rh]
 ;W[pb]C[White wins by one move.])
 (;W[qg]C[White 16 is a mistake.]
 ;B[pb]LB[ld:b][qf:a]C['a' and 'b' are miai.]
 (;W[qf]
 ;B[ld])
 (;W[ld]
 ;B[qf]
 ;W[rf]
 ;B[re]))
 (;W[pb]
 ;B[qb]
 ;W[oa]
 ;B[qe]))))
 (;W[nc]LB[rd:a][pe:b]C[White 10 is a peaceful reply, and a loss locally.
 Black continues with 'a'. Black 'b' is greedy.]
 (;B[rd]
 ;W[re]
 ;B[sc]
 ;W[oe]
 ;B[qe]
 ;W[nd]LB[re:12][of:A][ng:B]C[
 * Joseki *
 Black has a territorial advantage. White kept things simple.
 The aji of White 12 disables Black to press hard into the middle.
 Black continues with 'a'. 'b' is questionable..]
 (;B[of]C[Later.]
 ;W[nf]
 ;B[ng]
 ;W[mg]LB[mh:B][nh:A]C['a' is correct. 'b' is a mistake.]
 (;B[nh]
 ;W[mh]
 ;B[ni]
 ;W[mi]
 ;B[nj]
 ;W[mf])
 (;B[mh]
 ;W[og]
 ;B[nh]
 ;W[qf]
 ;B[pe]
 ;W[pg]))
 (;B[ng]LB[of:A][og:B]C[Mistake. 'a' and 'b' punish.]
 (;W[of]
 ;B[og]
 ;W[pg]
 ;B[qg]
 ;W[ph]
 ;B[qh]
 ;W[pi]LB[of:A][og:B][ni:B][qi:A][qj:C]C[Pushing from behind on 'a' weakens the center stones. Strengthening the center on 'b' allows White to settle on the right side. Jumping on 'a' can be foiled too.]
 (;B[qi]
 ;W[pj])
 (;B[ni]
 ;W[rf]
 ;B[qf]
 ;W[qi]
 ;B[rg]
 ;W[rh]
 ;B[se]
 ;W[pm])
 (;B[qj]
 ;W[qi]
 ;B[ri]
 ;W[rf]
 ;B[qf]
 ;W[rh]
 ;B[rg]
 ;W[rj]
 ;B[sh]LB[oj:B][qk:A]C['a' with the ladder. Without perhaps 'b'.]
 (;W[qk])
 (;W[oj]
 ;B[qk]
 ;W[ol]
 ;B[qm]
 ;W[li])))
 (;W[og]
 ;B[of]
 ;W[nf]
 ;B[mf]
 ;W[ne]LB[pg:A][oh:B]C['a' gives a disadavantageous position, 'b' a disaster for Black.]
 (;B[pg]
 ;W[oh])
 (;B[oh]
 ;W[qf]))))
 (;B[pe]C[Black 11 is a greedy attempt to capture all the White stones at right.]
 ;W[rd]LB[sb:c][sc:b][qe:a]C[Black 'a' is better than 'b' or 'c'.]
 (;B[qe]
 ;W[re]
 ;B[rf]
 ;W[oe]
 ;B[nd]
 ;W[of]LB[md:a][pg:b]C['a' and 'b' are miai.])
 (;B[sc]
 ;W[sb]
 ;B[sa]
 ;W[sd]LB[qb:a][qe:b]C[Black may try 'a' or 'b'. Neither work.]
 (;B[qb]
 ;W[rf]
 ;B[rg]
 ;W[re]C[White 20 is the tesuji to give White enough liberties to win the ensuing ko.]
 ;B[ob]
 ;W[nb]
 ;B[qf]
 ;W[oa]
 ;B[sf]
 ;W[pb]C[It is White's turn to take ko. Black cannot win this fight with only local ko threats.])
 (;B[qe]
 ;W[sb]
 ;B[qb]
 ;W[ra]
 ;B[qa]
 ;W[pa]
 ;B[sa]
 ;W[nd]C[White's big ko threat.]
 ;B[oe]
 ;W[ra]))
 (;B[sb]C[Black 13 aims to capture without ko.]
 ;W[ob]
 ;B[qb]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[qf]
 ;W[qe]LB[qh:a][rh:b]C[Black 'a' and 'b' are both hopeless.]
 (;B[qh]
 ;W[pg]
 ;B[og]
 ;W[oe])
 (;B[rh]
 ;W[oe]
 ;B[nd]
 ;W[of]
 ;B[pg]
 ;W[og]
 ;B[ph]
 ;W[md])))))
 (;W[nc]LB[rd:B][pe:A]C[White 8 is a mistake.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[pe]LB[rc:a][rd:b]C[White may try 'a' or 'b'. White 'b' depends upon a ladder to work.]
 (;W[rc]LB[rb:b][rd:a]C[Black continues with 'a' or 'b'.]
 (;B[rd]
 ;W[qe]
 ;B[re]
 ;W[qf]
 ;B[qg])
 (;B[rb]
 ;W[rd]LB[rb:9][nc:10][oc:4][pc:5][qc:7][rc:8][od:1][pd:6][qd:2][rd:12][pe:11][pf:3]C[See the variation referenced by the numbers, White 10 played before White 8, for continuation.]))
 (;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[qf]
 ;W[re]
 ;B[rg]
 ;W[qg]
 ;B[qh]
 ;W[pb]
 ;B[qb]
 ;W[ob]
 ;B[sf]
 ;W[oe]
 ;B[nd]
 ;W[of]
 ;B[og]
 ;W[md]
 ;B[ne]
 ;W[nf]
 ;B[me]
 ;W[mf]
 ;B[le]
 ;W[sb]C[White takes the corner but...]
 ;B[lf]C[... White's center stones are likely forfeit.]))
 (;B[rd]C[Black 9 is too mild.]
 ;W[oe]
 ;B[re]
 ;W[nd])))
 (;B[nc]
 ;W[ob]
 ;B[pb]LB[nb:A][nd:B][oe:C]C[Black 7 and 9 comprise a famous trick play.
 'a' is correct, 'b' and 'c' are mistakes.]
 (;W[nb]
 ;B[rc]LB[mc:B][qc:C][nd:D][rd:A]C[White punishes with 'a' or 'b'.
 'c' only gives an equal result.
 'd' is a mistake.]
 (;W[rd]LB[rb:B][qc:A]C['a' gives Black an inferior result.
 'b' loses the corner,]
 (;B[qc]LB[mc:B][rf:A]C['a' or 'b' are the same variation.]
 (;W[rf]LB[nd:C][oe:B][rg:A]C[Neither 'a', 'b' or 'c' give Black a satisfying result.]
 (;B[rg]LB[sd:A][qg:B]C['a' is correct, 'b' is inferior.]
 (;W[sd]LB[rb:B][qf:A]C[Black takes the right side on 'a' or a small corner on 'b'.]
 (;B[qf]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[pj])
 (;B[rb]LB[qa:B][qg:A]C['a' is correct. With 'b', White dies on the right.]
 (;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[qa])
 (;W[qa]
 ;B[pa]
 ;W[sc]LB[mb:B][sb:A]
 (;B[sb]
 ;W[ra]LB[re:B][qf:A]C[Black kills on 'a' or 'b'.]
 (;B[qf]
 ;W[sf]
 ;B[qh]
 ;W[qe]
 ;B[pe]
 ;W[oa]
 ;B[se]
 ;W[re]
 ;B[sg])
 (;B[re]
 ;W[qf]
 ;B[qg]
 ;W[qe]
 ;B[pe]
 ;W[se]
 ;B[sg]
 ;W[oe]
 ;B[nd]
 ;W[pg]
 ;B[of]
 ;W[ne]
 ;B[sf]))
 (;B[mb]
 ;W[nd]
 ;B[oe]
 ;W[mc]
 ;B[lb]
 ;W[oa]))))
 (;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[se]
 ;W[mc]LB[nd:B][oe:A]C['a' is correct, 'b' is inferior.]
 (;B[oe])
 (;B[nd]
 ;W[md]
 ;B[nf]
 ;W[ic]LB[og:A]C[White still has the forcing move at 'a'.])))
 (;B[oe]LB[mc:A][qg:B]C['a' is correct. 'b', giving the top stones, is a mistake.]
 (;W[mc]
 ;B[rg]LB[rb:C][sd:A][qg:B]C['a' is correct 'b' and 'c' are mistakes.
 'b' gives three stones to make a position on the right side.
 'c' gives a seki and strong Black influence.]
 (;W[sd]LB[rb:A][qf:B]C['a' keeps the corner, but the center stays weak.
 'b' gives the corner for the right side.]
 (;B[rb]
 ;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[qa])
 (;B[qf]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[qk]))
 (;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]LB[sd:B][se:A]C['a' is correct. 'b' risks a ko.]
 (;B[se])
 (;B[sd]
 ;W[se]LB[qe:B][sf:A]C['a' is correct. 'b' is a mistake.]
 (;B[sf])
 (;B[qe]
 ;W[sc]
 ;B[sb]LB[ra:B][sd:A]C['a' is satisfied to hunt the center stone, 'b' tries to take the corner with a ko.]
 (;W[sd]
 ;B[ra])
 (;W[ra]
 ;B[sd]))))
 (;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[pa]
 ;W[sd]
 ;B[re]
 ;W[sc]
 ;B[qe]
 ;W[sa]
 ;B[se]
 ;W[oa]
 ;B[pe]
 ;W[sb]))
 (;W[qg]
 ;B[mc]
 ;W[mb]C[White cannot escape.]
 ;B[lb]LB[kb:B][lc:A]C['a' or 'b' don't work.]
 (;W[lc]
 ;B[kb]
 ;W[ld]
 ;B[me])
 (;W[kb]
 ;B[lc]
 ;W[la]
 ;B[ma]
 ;W[na]
 ;B[pa]
 ;W[ka]
 ;B[oa]
 ;W[ma]
 ;B[jc])))
 (;B[nd]LB[mc:A][qg:B]C[White gives stones on the right side with 'a' or the top side with 'b'.]
 (;W[mc]
 ;B[rg]LB[rb:C][sd:A][qg:B]C['a' is correct. 'b' is inferior. 'c' results in a seki.]
 (;W[sd]
 ;B[rb]
 ;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[qa])
 (;W[qg]
 ;B[qf]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[se]
 ;W[md]
 ;B[nf]
 ;W[ic]LB[og:A]C[White still has the forcing move at 'a'.])
 (;W[rb]
 ;B[sb]
 ;W[ra]
 ;B[pa]
 ;W[sd]
 ;B[re]
 ;W[sc]
 ;B[qe]
 ;W[oa]
 ;B[se]
 ;W[sa]
 ;B[pe]
 ;W[sb]))
 (;W[qg]
 ;B[mb])))
 (;W[mc]LB[sd:D][oe:A][pe:C][re:B]C['a' is correct, Black cannot capture on 'b', 'c' or 'd'.]
 (;B[oe]
 ;W[rf]LB[mc:14][rf:16]C[Same variation as White 14 before White 16.])
 (;B[re]
 ;W[oe]
 ;B[nd]
 ;W[me])
 (;B[pe]
 ;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qg]
 ;W[rb]
 ;B[sc]
 ;W[sd]
 ;B[sf]
 ;W[pa])
 (;B[sd]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[sc]
 ;W[qf]
 ;B[qg]
 ;W[pe]
 ;B[oe]
 ;W[of]
 ;B[pg]
 ;W[ne])))
 (;B[rb]
 ;W[mc]LB[nd:B][oe:A]C['a' or 'b' don't help.]
 (;B[oe]LB[qf:B][rf:A]C['a' or 'b' take the corner,]
 (;W[rf]
 ;B[rg]
 ;W[pa]
 ;B[qc]LB[qa:A][ra:B]C['a' kills the corner.
 'b' is recommended by Ishida Yoshio, but a mistake.]
 (;W[qa]LB[ra:B][re:A]C['a' or 'b' don't help.]
 (;B[re]
 ;W[qe]
 ;B[qf]
 ;W[se]
 ;B[qh]
 ;W[ra]LB[sb:B][sc:A]C['a' or 'b' don't help.]
 (;B[sc]
 ;W[sd]LB[sa:B][sg:A]
 (;B[sg]
 ;W[qb]
 ;B[sf]
 ;W[sb])
 (;B[sa]
 ;W[oa]
 ;B[sg]
 ;W[qb]))
 (;B[sb]
 ;W[sd]
 ;B[sg]
 ;W[sa]
 ;B[sf]
 ;W[sc]
 ;B[pe]
 ;W[qb]))
 (;B[ra]
 ;W[sc]
 ;B[sb]
 ;W[sd]
 ;B[re]
 ;W[qe]
 ;B[qf]
 ;W[se]
 ;B[sg]
 ;W[oa]
 ;B[sf]
 ;W[qb]
 ;B[re]
 ;W[sa]))
 (;W[ra]
 ;B[re]
 ;W[sd]
 ;B[qa]LB[oa:B][qb:A]C['a' gives a ko, which is an inferior result. 'b' is recommended by Ishida Yoshio and a mistake, as Black lives.]
 (;W[qb])
 (;W[oa]
 ;B[sa])))
 (;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[rf]
 ;W[qe]
 ;B[qh]
 ;W[rh]
 ;B[ri]
 ;W[sf]
 ;B[qi]
 ;W[sd]))
 (;B[nd]
 ;W[md]LB[pe:A][nf:B]C[After 'a' or 'b', White takes the corner.]
 (;B[pe]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[qf]
 ;W[qe]
 ;B[sf]
 ;W[re]
 ;B[rh]
 ;W[oe]
 ;B[ne]
 ;W[of]
 ;B[pg]LB[mf:A][nf:B]C['a' captures some stone with a net, 'b' captures the left stones with a ladder.]
 (;W[mf])
 (;W[nf]))
 (;B[nf]
 ;W[qf]
 ;B[qg]
 ;W[rg]
 ;B[rf]
 ;W[qe]
 ;B[rh]
 ;W[pg]
 ;B[qh]
 ;W[of]))))
 (;W[mc]
 ;B[nd]
 ;W[rd]
 ;B[qc]LB[mc:12][rd:14]C[Same variation as White 14 before White 12.])
 (;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[sc]
 ;W[pa]
 ;B[sa]
 ;W[rb]
 ;B[sb]
 ;W[oa]
 ;B[rd]
 ;W[qa]
 ;B[re]
 ;W[rb]LB[nd:b][oe:a]C[Black continues with 'a' or 'b'. Black 'a' emphasizes the right at the expense of the top. Black 'b' gives Black positions at top and right. 'a' is safe. 'b' risks a fight.]
 (;B[oe]
 ;W[mc]
 ;B[qb]LB[qf:A]C[Prevents a White cut on 'a'.]
 ;W[jc])
 (;B[nd]
 ;W[qf]
 ;B[qe]
 ;W[pe]
 ;B[qg]
 ;W[oe]
 ;B[ld]C[Black is split, but White is still under attack.]))
 (;W[nd]
 ;B[oe]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[sc]
 ;W[pa]
 ;B[sa]
 ;W[rb]
 ;B[sb]LB[oa:A][rd:B]C['a' or 'b' don't help.]
 (;W[oa]
 ;B[rd]LB[qa:A][qe:B]C['a' or 'b' don't help.]
 (;W[qa]
 ;B[re]
 ;W[rb]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[qb]
 ;B[qg]
 ;W[lb]
 ;B[kc])
 (;W[qe]
 ;B[re]
 ;W[qf]
 ;B[qa]
 ;W[rf]
 ;B[mc]
 ;W[mb]
 ;B[se]))
 (;W[rd]
 ;B[oa]
 ;W[na]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[lc]
 ;B[md]
 ;W[kb]
 ;B[re])))
 (;W[nd]
 ;B[oe]
 ;W[nb]
 ;B[rc]LB[nb:12][nd:10]C[Same variation as White 12 before White 10.])
 (;W[oe]
 ;B[nd]
 ;W[pe]LB[rc:A][qf:B]C['a' takes the corner, 'b' is possible to develop the right side.
 In both cases White has only a small territory.]
 (;B[rc])
 (;B[qf]
 ;W[qb]
 ;B[nb]
 ;W[qc]
 ;B[oa]
 ;W[re])))
 (;B[pb]C[Trickmove of Alexander Dinerchtein]
 (;W[qf]C[Correct punishment]
 ;B[nc]
 ;W[oe]
 ;B[nd]
 ;W[pg]C[White is slightly better])
 (;W[ob]
 ;B[rc]
 ;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[sc]
 ;W[pa]
 ;B[sa]
 ;W[rb]
 ;B[sb]
 ;W[oa]
 ;B[rd]
 ;W[qa]
 ;B[qe]
 ;W[rb]
 ;B[nd]
 ;W[re]
 ;B[qb]
 ;W[rf]
 ;B[pe]
 ;W[pc]C[Black may consider tennuki here. Later it's possible to start big ko fight, or create the wall in sente.
 Black has a slightly favorable result.]))))
 (;W[qf]LB[qc:c][qe:d][pg:a][qg:b]C[White must have ladder to play this way.
 Black continues with 'a', 'b' or 'c'.
 If White doesn't have the ladder, 'b' forces him into an inferior
 variation.
 Black 'd' gains a big wall, but gives a big corner and is inferior.]
 (;B[pg]LB[oc:a][qg:b]C[White continues with 'a'. White 'b' is willing to give up the corner for influence over the lower right.]
 (;W[oc]LB[nc:a][pc:c][pd:b]C[Black continues with 'a' or 'b' for an exchange of White territory for Black influence.
 Black 'c' gives Black the corner. The exchange is even if White can use his sente to get an important point, such as nearby the marked point.]MA[gc]
 (;B[nc]
 ;W[pc]
 ;B[md]
 ;W[qg]
 ;B[ph]C[
 * Joseki *])
 (;B[pd]
 ;W[pc]
 ;B[qc]LB[rd:a][qe:b]C[White continues with 'a' for a peaceful resolution, or 'b' to start a fight.]
 (;W[rd]
 ;B[nc]
 ;W[qb]
 ;B[md]C[
 * Joseki *])
 (;W[qe]LB[qb:a][rc:b]C[White 10 is a good way to start a fight.
 Black continues with 'a'. Black 'b' is a mistake.]
 (;B[qb]
 ;W[nc]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[qh])
 (;B[rc]C[Black 11 is a mistake.]
 ;W[qb]
 ;B[rb]
 ;W[pb]C[The three Black stones cannot live.]
 ;B[qg]
 ;W[rd])))
 (;B[pc]C[Black 'c' was an innovation by Yoo Chang-hyuk in the 27th Wangwi.]
 ;W[pd]
 ;B[qc]LB[rc:A][oe:B]C[White plays 'a', 'b' is a mistake.]
 (;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]LB[nc:a][oe:b]C[White 'a' is the only continuation. White gets a terrible result with 'b'.]
 (;W[nc]
 ;B[nb]LB[mc:a][oe:b]C[White 'a' is the only continuation. White 'b' is unreasonable.]
 (;W[mc]
 ;B[oe]
 ;W[sb]
 ;B[qb]LB[ld:a][qg:b]C[White 'a' is correct; 'b' leads to an uphill battle for White.]
 (;W[ld]LB[mb:a][qg:b]C[Black 'a' is the correct continuation; 'b' is unreasonable and leads to an approach-move ko.]
 (;B[mb]
 ;W[lb]
 ;B[kc]
 ;W[lc]
 ;B[ma]
 ;W[qg]LB[ph:b][qh:a]C[Black continues with 'a'. Black 'b' is slack and gives White an advantage.]
 (;B[qh]
 ;W[rh]LB[rg:b][ri:a]C[The Black nidan-bane at 'a' is correct. Sealing White in with a move at 'b' is premature.]
 (;B[ri]
 ;W[ra]
 ;B[pa]
 ;W[qi]
 ;B[ph]
 ;W[rj]
 ;B[rg]
 ;W[si]
 ;B[qe]
 ;W[rf]
 ;B[re]
 ;W[sg]
 ;B[se]
 ;W[gc]C[Now White still gets his way, but Black captures the corner.])
 (;B[rg]C[Black 29 is a mistake.]
 ;W[rf]
 ;B[ri]
 ;W[sg]
 ;B[qi]
 ;W[gc]C[White grabs the point that is important to him.]))
 (;B[ph]
 ;W[ri]))
 (;B[qg]C[Black 21 is a mistake.]
 ;W[pa]
 ;B[qe]
 ;W[ra]
 ;B[pb]
 ;W[mb]
 ;B[qa]
 ;W[na]
 ;B[sa]
 ;W[sc]))
 (;W[qg]
 ;B[ld]))
 (;W[oe]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[pe]))
 (;W[oe]C[White 14 is a mistake.]
 ;B[nc]
 ;W[pe]
 ;B[qg]))
 (;W[oe]
 ;B[nd]
 ;W[pe]
 ;B[nc]
 ;W[ne])))
 (;W[qg]LB[qc:A][ph:B][qh:C]C[In absense of other stones, White 6 gives Black a slightly favorable
 result. There may be reasons for White to play this way.
 Black can take the corner with 'a', press down from above with 'b' or provoke a cut with 'c'.]
 (;B[qc]LB[rc:b][ph:a]C[White continues with 'a' or 'b'.]
 (;W[ph]
 ;B[pd]
 ;W[qe]
 ;B[rc]CR[qj]C[Locally, the result slightly favors Black.
 Next, White extends down the right side, at least as far as the
 mark.])
 (;W[rc]
 ;B[pd]
 ;W[qe]
 ;B[ph]LB[qb:a][qh:b]C[White continues with 'a' or 'b'.]
 (;W[qb]
 ;B[qh])
 (;W[qh]
 ;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[pi])))
 (;B[ph]LB[ic:B][oc:A][pf:3]C['a' is correct. The attempt to eliminate Black's thickness on the outside like on 'b' fails, except if White has strong positions in the upper left and lower right corner (in which case Black 3 is already questionable).]
 (;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[md])
 (;W[ic]
 ;B[qc]
 ;W[rc]
 ;B[pc]
 ;W[rb]LB[gc:A][qh:B]C[If Black is in the upper left, he will first attack the White stone with 'a'.
 Else he will immediately switch to 'b'.]
 (;AB[dd]
 ;B[gc]
 ;W[ld]
 ;B[qh])
 (;AW[ed]
 ;B[qh])))
 (;B[qh]
 ;W[pe]
 ;B[oe]
 ;W[ph]
 ;B[qi]
 ;W[oh]
 ;B[ng]
 ;W[oj]
 ;B[pk])))
 (;B[qg]LB[pe:b][pg:a]C[White cuts at 'a'. White 'b' is a gross mistake.]
 (;W[pg]LB[qe:a][of:b]C[Black continues with 'a' or 'b'.
 Black 'a' gives White the corner while Black takes thickness while persuing a White center group.
 Black 'b' is a powerful fighting method and trick play, and works whether the ladder is favorable or not.]
 (;B[qe]
 ;W[rf]LB[pe:a][of:b][qf:4]C[Black plays 'a', as the ladder should be unfavorable/
 If White made the mistake to play White 4 without the ladder, Black punishes on 'b'.]
 (;B[pe]
 ;W[re]LB[ph:c][qh:a][qi:b]C[Black continues with 'a'. 'a' can be regarded as trick play inviting a mistake.
 Black 'b' has also been played professionally. Black 'c' is sometimes seen in amateur games.]
 (;B[qh]LB[qb:C][oc:B][pd:A][ph:D]C['a' is correct and simple, 'b' is the old joseki, but inferior and gives chances for many trick play attempts.
 'c' leaves the cutting stone in the center heavy.
 'd' is being tricked.]
 (;W[pd]LB[oc:B][oe:A]C['a' is correct, 'b' is inferior endgame.]
 (;B[oe]
 ;W[og]
 ;B[ob]
 ;W[qb]
 ;B[pj]C[
 * Joseki *
 Black has as little influence over the top as possible, so now the White cutting stones have the best chances.])
 (;B[oc]
 (;W[og]LB[pb:A]C[Better to start at 'a' -]
 ;B[oe]
 ;W[qb]
 ;B[pj])
 (;W[pb]
 ;B[ob]
 ;W[pi]
 ;B[qi]
 ;W[qj]
 ;B[rj]
 ;W[ph]
 ;B[qk]
 ;W[pj]
 ;B[rl]
 ;W[rg]
 ;B[ri]
 ;W[nf]
 ;B[oe]
 ;W[pc]C[White is favorable!])))
 (;W[oc]LB[nc:B][pd:A][rd:C]C['a' and 'b' are joseki.
 'a' has many mistake continuations.
 'c' is a trick play.]
 (;B[pd]
 ;W[pc]
 ;B[qc]
 ;W[rd]LB[qb:B][nc:A]C['a' is joseki, 'b' takes more influence for more territory.]
 (;B[nc]
 ;W[qb]
 ;B[md])
 (;B[qb]LB[pb:B][nc:A]C['a' is correct. 'b' is a mistake.]
 (;W[nc]LB[rc:B][nd:A]C['a' is correct and reverts to a joseki-like position. 'b' leads to various ways of White's superiority.]
 (;B[nd]
 ;W[pb]
 ;B[mc]
 ;W[rb]
 ;B[nb]
 ;W[qa]
 ;B[ld]
 ;W[og]
 ;B[pj]C[Black has now more influence to the top side than necessary.])
 (;B[rc]LB[og:b][ph:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ph]LB[rg:b][qi:a]C[Black continues with 'a' or 'b'.]
 (;B[qi]LB[ng:a][pi:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[ng]LB[me:a][nf:b]C[Black cannot escape. Neither Black 'a' nor 'b' work.]
 (;B[me]
 ;W[ne]
 ;B[nd]
 ;W[md]
 ;B[nf]
 ;W[of]C[White captures in a snap-back.])
 (;B[nf]
 ;W[mf]
 ;B[me]
 ;W[of]LB[nd:b][ne:a]C[Neither 'a' nor 'b' work for Black.]
 (;B[ne]
 ;W[nd]
 ;B[oe]
 ;W[le])
 (;B[nd]
 ;W[md]
 ;B[mc]
 ;W[ld])))
 (;W[pi]C[White 22 is a mistake. Black escapes.]
 ;B[ne]))
 (;B[rg]C[Black 21 saves the five Black stones, in the process giving White a great wall in the center while Black takes 20 points in gote.]
 ;W[qi]
 ;B[ri]
 ;W[sg]
 ;B[rh]
 ;W[rj]
 ;B[qj]
 ;W[pi]
 ;B[rk]
 ;W[nd]
 ;B[of]
 ;W[nf]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[pj]
 ;B[qk]
 ;W[ni]
 ;B[sf]
 ;W[nh]
 ;B[sd]))
 (;W[og]C[White 20 is a mistake.]
 ;B[nf])))
 (;W[pb]
 ;B[nc]
 ;W[nb]
 ;B[pa]
 ;W[ob]
 ;B[rc]
 ;W[sb]
 ;B[md]LB[mc:B][sc:A]C[White loses the top side after 'a' or the right side after 'b'.]
 (;W[sc]
 ;B[mb]
 ;W[rb]
 ;B[oh])
 (;W[mc]
 ;B[sc]))))
 (;B[nc]
 ;W[pc]
 ;B[md]
 ;W[og]
 ;B[pj]
 ;W[mg])
 (;B[rd]LB[qc:A][rc:B][pd:C]C['a' is correct. 'b' or 'c' are being tricked.]
 (;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[pc]
 ;W[qb]
 ;B[nc]
 ;W[og])
 (;W[rc]
 ;B[qc]
 ;W[sd]
 ;B[pc])
 (;W[pd]
 ;B[ne]
 ;W[rc]
 ;B[nc]
 ;W[pc]
 ;B[ob]
 ;W[og]
 ;B[pb]
 ;W[sd]
 ;B[nf]
 ;W[pj]
 ;B[qj]
 ;W[pk]
 ;B[qi]LB[nj:B][qk:A]C[White cannot damage the Black group on the right with 'a' nor 'b'.]
 (;W[qk]
 ;B[oh])
 (;W[nj]
 ;B[ql]))))
 (;W[qb]LB[oh:A][pj:B]C[Black makes thickness on 'a' or 'b'.]
 (;B[oh])
 (;B[pj]))
 (;W[ph]LB[pi:B][qi:A]C[Black punishes on 'a' or 'b'.
 'a' is light, 'b' solidifies the position in the top right corner.]
 (;B[qi]
 ;W[pi]
 ;B[qj]
 ;W[qb]C[The White center stones are heavy.])
 (;B[pi]
 ;W[ng]
 ;B[qj]LB[pd:A][ni:B]C[White gets a hunted group after 'a' or a dead corner after 'b'.]
 (;W[pd]
 ;B[ne]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[ni])
 (;W[ni]
 ;B[qc]
 ;W[rc]
 ;B[pd]
 ;W[rd]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[rg]
 ;B[rh]
 ;W[sb]
 ;B[sg]
 ;W[sf]
 ;B[sd]))))
 (;B[qi]C[Black 11 is a pattern first played professionally by Otake Hideo against Ishida Yoshio in the 1974 Meijin league.]
 ;W[og]
 ;B[rg]
 ;W[pd]C[White 14 is an application of a 5-3 joseki, where a similar order of moves is produced one line closer to the upper edge.]
 ;B[oe]
 ;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[pc]
 ;B[md]
 ;W[oi]
 ;B[pk]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[lf]
 ;W[lh]
 ;B[jf]
 ;W[lc]
 ;B[mc]
 ;W[gd])
 (;B[ph]
 ;W[og]
 ;B[qh]
 ;W[oc]))
 (;B[of]C[Black must have the ladder to play this way.]
 ;W[re]
 ;B[ph]LB[qf:4]C[This variation is inferior for White, so White will avoid it and not play White 4 without the ladder.]))
 (;B[of]LB[pe:a][qh:b]C[Black starts a fight. This can be considered a trick play, though an equal result is possible.
 White continues with 'a' or 'b'.
 White needs the ladder for 'b'.]
 (;W[pe]
 ;B[rf]LB[oe:A]C[Black can just connect at A
 Atari at S14 is probably a mistake by the previous editor]
 ;W[qe]
 ;B[oe]LB[rg:A][qh:B]C['a' is correct. 'b' is a mistake.]
 (;W[rg]
 ;B[qh]
 ;W[rh]
 ;B[qi]
 ;W[pc]CR[oc]C[The red dot point is large for either player, depending on the importance of the top.])
 (;W[qh]
 ;B[rg]
 ;W[rh]
 ;B[og]
 ;W[ph]
 ;B[qc]LB[rc:A][re:B]C['a' is correct. 'b' is a mistake.]
 (;W[rc]
 ;B[rd]
 ;W[pc]
 ;B[qb]LB[pd:B][re:A]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[pd]
 ;W[sd]
 ;B[rb])
 (;W[pd]
 ;B[re]
 ;W[rb]
 ;B[pb]))
 (;W[re]
 ;B[rd]
 ;W[sf]
 ;B[rc])))
 (;W[qh]LB[qe:b][rg:a]C[Black continues with 'a' or 'b'. Black 'a' is complicated, 'b'
 simple.
 In professional games 'a' is more common]
 (;B[rg]LB[rf:A][rh:B]C[White continues with 'a'. White 'b' is getting tricked.]
 (;W[rf]
 ;B[rh]
 (;W[qi]LB[ph:a][ri:b]C[Black continues with 'a' if the ladder is favorable, 'b' if not.
 Usually the whole variation is bad for Black, if he has bad ladder]
 (;B[ph]
 ;W[og]
 ;B[pi]
 (;W[ri]
 ;B[ng])
 (;W[ng]
 ;B[qj]
 ;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[nf]
 ;W[nb]
 ;B[mg]C[Cho Hunhyun vs Kim Ilhwan, 2012. Looks strange for White, because Black is so thick.])
 (;W[nf]
 ;B[qj]
 ;W[ne]C[White may try to attack, but he has too many weak points. Bad fight for White.]))
 (;B[ri]
 ;W[qj]
 ;B[rj]
 ;W[qk]LB[qc:b][rk:a]C[Black must continue at 'a'. Black loses with White 'b'.]
 (;B[rk]
 ;W[ql]
 ;B[qc]
 ;W[rc]
 (;B[rb]LB[pc:b][rd:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[rd]LB[qb:b][rl:a]C[Black must continue with 'a'. Black cannot afford to play 'b': he will be one move short.]
 (;B[rl]
 ;W[pc]
 ;B[oc]
 ;W[qb]
 ;B[qm]
 ;W[og]
 ;B[ng]C[This is an equal result.])
 (;B[qb]
 ;W[rl]
 ;B[pd]
 ;W[sk]))
 (;W[pc]C[White 22 is a mistake.]
 ;B[qb]
 ;W[pd]
 ;B[oc]
 ;W[pb]
 ;B[rd]
 ;W[re]
 ;B[sd]
 ;W[ob]
 ;B[mc]
 ;W[mb]LB[lb:B][lc:A]C['a' is correct. 'b' is a mistake.]
 (;B[lc]
 ;W[nb]
 ;B[rl])
 (;B[lb]
 ;W[nb]
 ;B[lc]
 ;W[se]
 ;B[sc]
 ;W[rl])))
 (;B[pd]
 ;W[qb]
 ;B[qe]
 ;W[pc]
 ;B[re]C[Black can get cutting stones, but ponnuki is too good for White.]))
 (;B[qc]
 ;W[rk]
 ;B[rd]
 ;W[qe]
 ;B[pd]
 ;W[rc]
 ;B[rb]
 ;W[sg]
 ;B[pe]
 ;W[sj])))
 (;W[ph]C[White can fight here, if the ladder is bad for him.]
 ;B[qi]
 ;W[pi]
 ;B[qj]
 ;W[pj]
 ;B[qk]
 ;W[qb]C[In some cases it's fine for White, but on empty board it's not.]))
 (;W[rh]LB[rf:b][og:a]C[Black continues with 'a' or 'b'.]
 (;B[og]
 ;W[ph]
 ;B[qe]
 ;W[rf]
 ;B[re]
 ;W[sg]
 ;B[pd]C[Black has huge corner. He is favorable])
 (;B[rf]
 ;W[qe]
 ;B[ph]
 ;W[og]
 ;B[ng]
 ;W[oh]
 ;B[pi]LB[re:a][nf:b]C[White may try 'a' or 'b', neither favorable.]
 (;W[re]
 ;B[ni]
 ;W[sf]
 ;B[nh]
 ;W[sg]
 ;B[oi])
 (;W[nf]
 ;B[ne]
 ;W[nh]
 ;B[qi]
 ;W[mg]
 ;B[me]
 ;W[re]
 ;B[ri]
 ;W[pd]
 ;B[oe]
 ;W[ob]))))
 (;B[qe]LB[rf:b][rg:a]C[White 'a' is better than 'b'.]
 (;W[rg]
 ;B[rf]LB[pd:A][re:B][qg:C]C[White continues with 'a'. White 'A is tough, but White gets the corner through ko fights with 'a'.
 'b' starts a ko, bad, as in fuseki, there are no ko threats.
 'c' is getting tricked.
 Another good method is tenuki. White can create ko threats first and play ko later.]
 (;W[pd]
 ;B[oc]
 ;W[pe]
 ;B[qg]
 ;W[oe]
 ;B[ne]
 ;W[qf]
 ;B[re]
 ;W[rd]
 ;B[qg]
 ;W[nd]
 ;B[qf]
 ;W[nc]
 ;B[pb]
 ;W[nb]
 ;B[rb]
 ;W[qb]
 ;B[qc]
 ;W[pc]
 ;B[ob]
 ;W[rc]
 ;B[qa]
 ;W[oa]
 ;B[qc]
 ;W[me]
 ;B[nf]
 ;W[qb])
 (;W[re]
 ;B[qg])
 (;W[qg]
 ;B[pe]
 ;W[re]
 ;B[rd]
 ;W[sf]
 ;B[qc]))
 (;W[rf]
 ;B[re]
 ;W[rg]
 ;B[pd]C[Clearly bad for White])))
 (;W[rf]C[The most simple way]
 ;B[qh]LB[qb:B][oc:A]C[White can play at 'a' or 'b' next.])
 (;W[re]C[Rare Japanese joseki. Outdated.])))
 (;W[pe]C[White 6 is the epitome of vulgarity.]
 ;B[oe]LB[pg:a][rg:b]C[White 'a' and 'b' are possible continuations. Either way, Black still gets a favorable outcome.]
 (;W[pg]
 ;B[of]
 ;W[qh]
 ;B[rg]LB[rf:c][rh:b][pi:a]C[White continues with 'a', or with a favorable outside ladder, 'b'. White 'c' is a mistake.]
 (;W[pi]
 ;B[qc]LB[rc:b][rf:a]C[White continues with 'a'. White 'b' is ridiculous.]
 (;W[rf]
 ;B[og]
 ;W[ph]
 ;B[rd])
 (;W[rc]C[White 14 may look tough, but it is suicidal.]
 ;B[re]
 ;W[qe]
 ;B[rd]
 ;W[pc]
 ;B[qb]
 ;W[pd]
 ;B[pb]
 ;W[oc]
 ;B[nc]))
 (;W[rh]C[White must have the ladder to play this way.]
 ;B[rf]
 ;W[qe]
 ;B[ph]
 ;W[og]
 ;B[ng]
 ;W[oh]
 ;B[pi]
 ;W[re]
 ;B[ni])
 (;W[rf]C[White would only play 12 if the ladder on the outside were unfavorable.
 This variation greatly favors Black.]
 ;B[rh]
 ;W[qi]
 ;B[ri]
 ;W[qj]
 ;B[rj]
 ;W[qk]
 ;B[qc]
 ;W[rc]
 ;B[pd]
 ;W[rd]
 ;B[rk]LB[qb:a][ql:b]C[White continues with 'a'. White 'b' compounds the mistake.]
 (;W[qb]
 ;B[og]
 ;W[ph]
 ;B[ql]C[White's right side group is in trouble.])
 (;W[ql]C[White 24 begins a ko fight that White loses.]
 ;B[qb]
 ;W[rl]
 ;B[rb]
 ;W[sg]
 ;B[qe]
 ;W[re]
 ;B[sc]
 ;W[sk]
 ;B[sd]LB[og:a]C[A ko fight, but Black wins, as he has the ko threat at 'a'.]
 ;W[og])))
 (;W[rg]
 ;B[pg]
 ;W[rh]
 ;B[qc]
 ;W[rc]
 (;B[qb]C[Not the best way to punish White]
 ;W[rb]LB[jc:A][re:a]C[White must play 14 because of the threat of Black 'a'.]
 (;B[jc])
 (;B[re]))
 (;B[re]C[Much better]
 ;W[qe]
 ;B[rd]
 ;W[rf]
 ;B[rb]
 ;W[pc]
 ;B[qb]C[Now White has weak group and he is in trouble. It was once played in Cho Hunhyun vs Yoo Changhyuk game.])
 (;B[pd]
 ;W[qe]
 ;B[rb]C[Another way to punish White. Black is favorable]))))
 (;B[qc]LB[rc:c][re:a][pg:b]C[White continues with 'a' or 'b'; 'c' is not recommended.]
 (;W[re]LB[pc:a][rc:b][pg:c]C[Black continues with 'a', possibly 'b' if corner territory is important.
 Black gives the corner for influence on 'c'.]
 (;B[pc]
 ;W[pg]C[
 * Joseki *])
 (;B[rc]
 ;W[mc]
 ;B[oc]
 ;W[pg]
 ;B[nf]
 ;W[jc])
 (;B[pg]
 ;W[pc]
 ;B[pd]
 ;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[oc]
 ;W[pb]))
 (;W[pg]
 ;B[pd]LB[pe:B][qe:A]C['a' is correct. 'b' is a mistake.]
 (;W[qe]
 ;B[rc]
 ;W[qj])
 (;W[pe]
 ;B[of]
 ;W[qh]
 ;B[oe]
 ;W[qe]
 ;B[rc]))
 (;W[rc]C[White 6 is not recommended.]
 ;B[pd]
 ;W[re]
 ;B[pg]))
 (;B[qe]LB[pe:A][re:B]C['a' is correct. 'b' reverts to a joseki and fails to punish Black.]
 (;W[pe]
 ;B[re]
 ;W[pd]
 ;B[oe]
 ;W[rf]
 ;B[pg]
 ;W[qh]
 ;B[oc]
 ;W[pb]
 ;B[ob]
 ;W[qb])
 (;W[re]
 ;B[pe]
 ;W[qg]
 ;B[rf]
 ;W[rd]
 ;B[qh]LB[od:1][qd:2][rd:10][pe:5][qe:3][re:4][pf:7][qf:6][rf:9][qg:8][qh:11]C[Same variation as the referenced by the numbers giving a different order of moves.])))
 (;W[]LB[jc:C][qc:B][re:A]C[White plays elsewhere.
 'a' emphasizes the right, 'b' the top side side. Although both moves are correct local continuations, they might not be the best moves on the whole board, e.g. a move like 'c' first can be better timing.]
 (;B[re]LB[ob:a][oc:b][qe:d]C[White continues with 'a'. White 'b' is a mistake. Playing elsewhere
 ('c') is unfavorable.
 Living on 'd' is also possible, but gives less points.]
 (;W[ob]LB[mc:b][pc:a]C[Joseki continues with Black 'a'. Black 'b' is not recommended.]
 (;B[pc]LB[pb:b][lc:a]C[White continues with 'a'. White 'b' is big, but White loses aji of a play on the right (threatening to extract White 2).]
 (;W[lc]LB[jc:A]C[
 * Joseki *
 Later Black plays 'a' or tenuki.]
 (;B[jc]
 ;W[pb]
 ;B[qc]
 ;W[nd]
 ;B[ne]
 ;W[oc]
 ;B[pd]
 ;W[md])
 (;B[]C[Black plays elsewhere.]
 ;W[qc]C[This demonstrates the aji of White 2.]
 ;B[pb]
 ;W[pd]
 ;B[oc]
 ;W[qf]
 ;B[qe]
 ;W[pe]C[And White can live or get to the center.]))
 (;W[pb]
 ;B[qc]LB[lc:a][nd:b]C[White continues with 'a' or 'b'.]
 (;W[lc]CR[rg]C[White has lost the aji of a forcing move at the mark.])
 (;W[nd]LB[ld:A][ne:B]C[White 9 was played by Takagawa against Segawa in the 1952 Honinbo lead.
 'a' is correct. 'b' is a mistake.]
 (;B[ld]
 ;W[ne]
 ;B[mb]C[Black 12 is a nicely timed forcing move.]
 ;W[nc]
 ;B[ic])
 (;B[ne]
 ;W[oc]
 ;B[oe]
 ;W[md]C[Too easy for White.]))))
 (;B[mc]LB[mb:b][pd:a]C[Black 6 is not recommended.
 White continues with 'a'. White 'b' is also playable, but give Black better thickness.]
 (;W[pd]
 ;B[oc]
 ;W[pb]
 ;B[pe]
 ;W[nb]
 ;B[le]
 ;W[rd]C[Black's thickness is not impressive, and White is nicely settled considering the move elsewhere.])
 (;W[mb]
 ;B[lc]
 ;W[oc]
 ;B[pd]
 ;W[qc]
 ;B[qe]
 ;W[nc]
 ;B[nd]
 ;W[lb]
 ;B[kc])))
 (;W[oc]C[White 5 is a mistake.]
 ;B[nc]LB[ob:b][pc:a][nd:c]C[White continues with 'a' to 'c'. White 'c' is somewhat a trick play.]
 (;W[pc]C[White ends up living in the corner in gote.]
 ;B[nb]
 ;W[rd]
 ;B[qe]
 ;W[pd]
 ;B[oe]
 ;W[ob])
 (;W[ob]LB[nb:b][pd:a]C[Black 'a' and 'b' are possible continuations.]
 (;B[pd]
 ;W[pc]
 ;B[nb]LB[rd:a][qe:b]C[White 'a' and 'b' are possible continuations.]
 (;W[rd]
 ;B[qe]
 ;W[qb])
 (;W[qe]
 ;B[qc]
 ;W[rc]
 ;B[qb]
 ;W[rb]
 ;B[pb]
 ;W[rd]
 ;B[qf]
 ;W[pe]
 ;B[oe]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[qh]))
 (;B[nb]
 ;W[pd]
 ;B[oe]
 ;W[rd]
 ;B[qe]
 ;W[pc]))
 (;W[nd]LB[pc:c][pd:a][oe:b]C[White attempts to pull a trick with 7.
 Black continues with 'a'. Black 'b' is tolerable if Black has the ladder, but not recommended. Black 'c' is a mistake.]
 (;B[pd]
 ;W[pc]
 ;B[nb]
 ;W[qe]
 ;B[qf]
 ;W[rd]
 ;B[rf]
 ;W[qb]
 ;B[ob]
 ;W[pb]
 ;B[md]
 ;W[ne]
 ;B[pe]LB[rb:a][me:b]C[White must play 'a' to save the corner. Anywhere else is a mistake, including 'b'.]
 (;W[rb]C[White must play 21 to save the corner.]
 ;B[me])
 (;W[me]C[White 21 is a mistake.]
 ;B[ld]LB[rb:a][nh:b]C[White must play 'a'. White 'b' or anywhere else spells death for the White corner stones.]
 (;W[rb]
 ;B[le]
 ;W[mg])
 (;W[nh]C[White 23 is a fatal mistake.]
 ;B[rc]C[Black 24 kills White's corner stones.])))
 (;B[oe]LB[nb:a][mc:b]C[Black 8 is only possible if Black has the ladder to the lower left, but Black 8 is still not recommended: why give an opportunity for a ladder block if not necessary?
 White must play 'a' if the ladder is unfavorable. If White has ladder, White continues with 'b'.]
 (;W[nb]C[White plays 9 when the ladder to the lower left favors Black.]
 ;B[mc]
 ;W[mb]
 ;B[lc]
 ;W[pc])
 (;W[mc]C[White plays 9 if the ladder is favorable, in which case Black has made a mistake.]
 ;B[nb]
 ;W[mb]
 ;B[ob]
 ;W[pc]
 ;B[md]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[ld]
 ;W[pb]
 ;B[lf]C[Black must squeeze, but the result is unsatisfactory for Black.]
 ;W[oa]
 ;B[le]
 ;W[na]))
 (;B[pc]C[Black 8 is a mistake.]
 ;W[ob]
 ;B[pd]
 ;W[pb]
 ;B[qc]
 ;W[mc])))
 (;W[]C[White plays elsewhere a second time, not good at all.]
 ;B[ob]C[White may have played three good points elsewhere, but being
 captured like this is unfavorable.])
 (;W[qe]
 ;B[qf]
 ;W[rd]
 ;B[pc]
 ;W[rf]
 ;B[rg]
 ;W[se]
 ;B[qh]
 ;W[rb]))
 (;B[qc]
 ;W[re]
 ;B[rc]
 ;W[qg])
 (;B[jc]))
 (;W[rf]C[White 4 is a half-hearted move; White is too low.]
 ;B[qc]
 ;W[rc]
 ;B[pc]LB[rb:b][qh:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[qh]
 ;B[kc])
 (;W[rb]C[White 8 gives White a needlessly low position.]
 ;B[qe]LB[rd:b][re:a]C[White 'a' is bad enough. White 'b' is worse.]
 (;W[re]
 ;B[pd]
 ;W[rd]
 ;B[kc])
 (;W[rd]
 ;B[ph]))))
 (;B[pg]LB[oc:c][qf:b][dp:a]C[
 Large Knight's Move = Oogeima = Nunmokcha = Da` Fei
 ----------------------------------------------------
 Black presses on a large scale with 3, like a samurai brandishing a sword. Black aims at an immediate lead, so White must be cautious.
 White best response is to play elsewhere ('a'), but may locally continue with 'b'. White 'c' is possible.
+]
 (;W[]LB[qc:A][qf:B]C[White's best response is to play elsewhere. Black follows up with 'a' to emphasize the top or 'b' to emphasize the right side.]
 (;B[qc]LB[rc:a][re:b][qf:c]C[White continues with 'a' to 'c'. White is confined to the corner with 'a', and escapes to the side with 'b' or 'c'. White 'b' leaves some thinness for White.]
 (;W[rc]
 ;B[pc]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[rg]
 ;W[qh]
 ;B[qg]
 ;W[qb]
 ;B[pb]
 ;W[rb])
 (;W[re]
 ;B[rc]
 ;W[qh])
 (;W[qf]LB[pd:a][pf:b]C[Black continues with 'a' or 'b'.]
 (;B[pd]
 ;W[re]
 ;B[rc]
 ;W[qh])
 (;B[pf]
 ;W[rc]
 ;B[pc]
 ;W[re])))
 (;B[qf]LB[ob:b][oc:c][pc:a]C[White continues with 'a' to live in the corner, or 'b' or 'c' to sacrifice the corner for a postion at top.]
 (;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb])
 (;W[ob]
 ;B[pc]
 ;W[pb]
 ;B[qc]
 ;W[lc])
 (;W[oc]LB[nc:B][pc:A]C['a' or 'b'.]
 (;B[pc]
 ;W[pd]
 ;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[ob]
 ;B[rd]
 ;W[qb]
 ;B[sc]
 ;W[pb]
 ;B[rc]
 ;W[nd]
 ;B[oe]
 ;W[kc])
 (;B[nc]
 ;W[pc]
 ;B[nd]))))
 (;W[qf]LB[pf:a][qg:b]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[md]
 ;W[qg]
 ;B[ph])
 (;B[qg]LB[oe:B][pf:A]C['a' is correct, 'b' is possible.]
 (;W[pf]LB[of:A][og:B]C['a' is correct. 'b' is a trick play.]
 (;B[of]
 ;W[og]
 ;B[nf]
 ;W[oh]
 ;B[qi]
 ;W[pi]
 ;B[rh]
 ;W[qj]LB[rf:A][rj:B]C['a' or 'b'.]
 (;B[rf]
 ;W[re]
 ;B[rj]
 ;W[qk]
 ;B[rk]
 ;W[ql]C[
 * Joseki *]
 ;B[qc]C[Black cannot kill.]
 ;W[rc]
 ;B[pc]
 ;W[sf]
 ;B[rg]
 ;W[rb]
 ;B[sd]
 ;W[se]
 ;B[qb]
 ;W[ra])
 (;B[rj]
 ;W[qk]
 ;B[rk]
 ;W[ql]
 ;B[qc]LB[rc:A][rf:B]C['a' is correct, 'b' is questionable.]
 (;W[rc]
 ;B[pc]
 ;W[rf]
 ;B[rl]
 ;W[qm]
 ;B[si]
 ;W[rb]
 ;B[kc])
 (;W[rf]
 ;B[rd]
 ;W[qh]
 ;B[ph]
 ;W[rg]
 ;B[qh]
 ;W[sh]
 ;B[ri]
 ;W[oj]
 ;B[qe]
 ;W[rl]
 ;B[ni]
 ;W[oi]
 ;B[pe]
 ;W[sk]
 ;B[re]
 ;W[sj])))
 (;B[og]LB[ld:B][pk:A]C[White is alive in the corner and mustn't continue to enlargen it, because that will only give Black a big wall.
 But Black is two moves behind: a connection of his stones and an extension. White uses this on 'a' or 'b'.]
 (;W[pk]
 ;B[qc]
 ;W[rc]
 ;B[pc]
 ;W[re]
 ;B[rg]
 ;W[rb]
 ;B[lc]
 ;W[ne])
 (;W[ld]
 ;B[qc]
 ;W[rc]
 ;B[pc]
 ;W[re]
 ;B[pk]
 ;W[ne])))
 (;W[oe]LB[nd:B][ne:C][pe:A]C['a' is correct, 'b' emphasizes the top side, and should be played only Black has already an extension on either the top or right
 side. 'c' is a mistake.]
 (;B[pe]TR[qf][qg]C[In any coming result, the exchange of the triangled stones is bad for White.]
 ;W[pd]
 ;B[ne]LB[oc:a][of:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oc]LB[nd:b][of:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[of]
 ;W[nc]LB[qe:a][rf:b]C[Black 'a' and White 'b' are large points that remain.])
 (;B[nd]C[Black 11 is a mistake.]
 ;W[nc]
 ;B[ld]
 ;W[mc]
 ;B[lf]))
 (;W[of]C[White 10 is a mistake.]
 ;B[pf]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[ld]
 ;W[mc]
 ;B[lf]C[Black's thickness is superior to White's territory. The two White stones are forfeit.]))
 (;B[nd]
 ;W[of]
 ;B[og]
 ;W[mf])
 (;B[ne]
 ;W[of]
 ;B[pd]
 ;W[qe]))))
 (;W[oc]
 ;B[pc]
 ;W[pd]
 ;B[qc]LB[ob:A][rc:B]C['a' is simple, but White needs the ladder, 'b' is complicated.
+]
 (;W[ob]C[
 If you know the follow-up, please email: kogo@waterfire.us.
+]
 ;B[rd]
 ;W[rc]LB[rb:B][qe:A][re:C]C['a' starts the ladder, if White made the mistake not having it.
 'b' is ok.
 'c' is not recommended, because Black ends in gote still needing an extension move. Still, after 'c' Black gets influence, while White gets a small corner with few possibilities to enlarge it.
+]
 (;B[qe]
 ;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[qf]
 ;W[of])
 (;B[rb]
 ;W[sc]
 ;B[sd]
 ;W[qb]
 ;B[sb]
 ;W[rc]
 ;B[sc]
 ;W[pb]
 ;B[rc]LB[oe:A][qf:B]C['a' is correct. 'b' is a mistake.
+]
 (;W[oe]LB[nd:C][pe:B][qe:A]C['a' is correct, 'b' is disadavantageous.
 Going out is usually best, but here 'c' is bad.
+]
 (;B[qe]
 ;W[nd]
 ;B[qk]LB[ic:A][qf:B]C['a' is correct, 'b' has no result.
+]
 (;W[ic])
 (;W[qf]
 ;B[pf]
 ;W[re]
 ;B[pe]
 ;W[se]
 ;B[od]))
 (;B[pe]
 ;W[nd]
 ;B[qe]
 ;W[ic]
 ;B[qk]LB[pe:21]C[Black 21 is an unneccesary move losing sente.
 ])
 (;B[nd]
 ;W[qf]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi]LB[mc:B][qi:A]C['a' or 'b'.
+]
 (;W[qi]
 ;B[pj]
 ;W[mc])
 (;W[mc]
 ;B[qi]
 ;W[re]
 ;B[rh]
 ;W[se]
 ;B[rg]
 ;W[ra]
 ;B[sf]
 ;W[sa])))
 (;W[qf]
 ;B[qe]
 ;W[pe]
 ;B[pf]
 ;W[oe]
 ;B[re]
 ;W[nd]
 ;B[qh]
 ;W[ic]))
 (;B[re]
 ;W[qb]LB[oe:A][pe:B]C['a' or 'b' are the same.
+]
 (;B[oe])
 (;B[pe]
 ;W[pb]
 ;B[oe])))
 (;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]
 ;W[nc]
 ;B[nb]LB[mc:B][oe:A]C[White 'a' is ok, White 'b' is disadvantageous.]
 (;W[oe]
 ;B[nd]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[ld]
 ;W[kc]
 ;B[kd]
 ;W[jc]LB[sb:B][jd:A]C[Black continues with 'a'. Black 'b' is possible.]
 (;B[jd]LB[sb:B][ic:A][id:C]C[White continues with 'a'. White 'b' is a mistake. 'c' is questionable.]
 (;W[ic]
 ;B[sb]
 ;W[nf]
 ;B[ng])
 (;W[id]
 ;B[ie]
 ;W[hd]
 ;B[sb]
 ;W[nf]
 ;B[ng])
 (;W[sb]
 ;B[ic]LB[ra:C][pb:B][qb:A]C['a', 'b' or 'c' don't help.]
 (;W[qb]
 ;B[pb]
 ;W[ra]
 ;B[jb])
 (;W[pb]
 ;B[qb]
 ;W[ra]
 ;B[pa]
 ;W[sa]
 ;B[qa]
 ;W[sc]
 ;B[jb])
 (;W[ra]LB[pb:A][qb:B]C['a' is correct. 'b' is a mistake.]
 (;B[pb]
 ;W[qb]
 ;B[jb])
 (;B[qb]
 ;W[qa]
 ;B[pb]
 ;W[mb]))))
 (;B[sb]
 ;W[nf]
 ;B[jd]
 ;W[id]
 ;B[ie]
 ;W[hd]
 ;B[of]
 ;W[pf]
 ;B[og]
 ;W[ne]
 ;B[ng]
 ;W[lf]
 ;B[kg]LB[mg:a]C[Keeping 'a' in reserve is a tesuji.]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[rf]
 ;B[lg]
 ;W[sg]LB[qe:a]C[White must play 42 or Black 'a' kills him.]))
 (;W[mc]
 ;B[oe]
 ;W[sb]
 ;B[qb]
 ;W[rg]
 ;B[rh]
 ;W[qg]
 ;B[qh]
 ;W[pf]
 ;B[of]
 ;W[pe]
 ;B[og]
 ;W[rf]C[Having to make life in gote is painful. White's three stones at top will suffer.])))
 (;W[dp]
 (;B[qf]
 ;W[pc]
 ;B[oc]
 ;W[ob]
 ;B[nb]
 ;W[pb]C[White can still live inside])
 (;B[qc]
 ;W[re]
 ;B[qf]
 ;W[pc]
 ;B[pd]
 ;W[qb]C[White is alive])))
 (;B[qf]LB[oc:B][pe:A]C[
 -Space Low Pincer = Ikken Basami = Hankan Hyeopgong = Yi Jia
 --------------------------------------------------------------
 Black 3 is a special approach when Black is strong in the surrounding area, or a trick play.
 'a' is correct, 'b' is getting tricked.
+]
 (;W[pe]LB[qc:A][ne:B][pg:C]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[qc]
 ;W[rc]
 ;B[pc]
 ;W[re]LB[kc:b][md:c][of:d][pg:a]C[Black continues with 'a' or 'b'. Black 'c' is not recommended.
 Black 'd' is a simple trick move.]
 (;B[pg]LB[oe:a][pf:b]C[White continues with 'a' or 'b'.]
 (;W[oe]
 ;B[md]
 ;W[ne]
 ;B[lc]
 ;W[ng])
 (;W[pf]
 ;B[og]LB[nf:A][qg:B]C['a' is correct, 'b' fails to capture on the top side.]
 (;W[nf]
 ;B[of]
 ;W[oe]
 ;B[ne]
 ;W[qg]
 ;B[qh]
 ;W[nd]
 ;B[me]
 ;W[nc]
 ;B[rg]
 ;W[pd])
 (;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[rh]
 ;W[rf])))
 (;B[kc]C[Black 9 renders the pincer meaningless, but the local result is equal.]
 ;W[oe]
 ;B[nd]
 ;W[qh])
 (;B[md]C[Black 9 is not recommended, as White easily settles his group.]
 ;W[qg]LB[kc:a]C[White 10 is a tesuji that settles his group. White can now aim to play at 'a', so Black must extend to cover that. White can be satisfied to end in sente.])
 (;B[of]C[Black 9 is the simplest of trick plays.]
 ;W[oe]
 ;B[ne]
 ;W[pf]
 ;B[pg]LB[nf:c][og:b][qg:a]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[qg]
 ;B[og]
 ;W[qh]
 ;B[md])
 (;W[og]C[White 14 is a mistake.]
 ;B[qe])
 (;W[nf]C[White 14 is a mistake.]
 ;B[qe])))
 (;B[ne]
 ;W[pf]
 ;B[pg]
 ;W[qg]
 ;B[qh]
 ;W[rg]
 ;B[ph]
 ;W[rf]C[Black's thin center position doesn't equal White's territory.])
 (;B[pg]
 ;W[oe]
 ;B[md]
 ;W[ne]
 ;B[nd]
 ;W[ng]C[Black can defend only one side, White can pincer on the other.]))
 (;W[oc]
 ;B[pc]
 ;W[pd]LB[nc:A][qc:B]C['a' is correct, 'b' loses a semeai.]
 (;B[nc]
 ;W[ob]
 ;B[pb]LB[nb:A][oe:B]C['a' is correct, 'b' is not recommended.]
 (;W[nb]
 ;B[rc]LB[qc:A][rd:B]C[White 'a' or 'b' don't help.]
 (;W[qc]
 ;B[qb]
 ;W[rb]
 ;B[ra]
 ;W[sb]
 ;B[sc]
 ;W[pa]
 ;B[sa]
 ;W[rb]
 ;B[sb]
 ;W[oa]
 ;B[rd]
 ;W[qa]
 ;B[oe]
 ;W[rb]
 ;B[qb]LB[re:B][pf:A]C[Black must recapture to make White moves onto 'a' or 'b' useless.]
 ;W[mc]
 ;B[kc])
 (;W[rd]
 ;B[qc]LB[mc:B][pe:A][pf:C]C['a', 'b' or 'c' don't help.]
 (;W[pe]
 ;B[oe]
 ;W[pf]
 ;B[of]LB[og:B][pg:A]C['a' or 'b' don't help.]
 (;W[pg]
 ;B[mc]
 ;W[mb]
 ;B[lb])
 (;W[og]
 ;B[mc]
 ;W[mb]
 ;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[rf]
 ;B[qh]
 ;W[rg]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[jb]
 ;B[kc]
 ;W[ka]
 ;B[la]
 ;W[ma]
 ;B[jc]
 ;W[ib]
 ;B[ja]
 ;W[ia]
 ;B[oa]
 ;W[ic]
 ;B[pa]
 ;W[ja]
 ;B[rh]LB[sc:A]C[Later, Bäack can secure his corner on 'a' attacking the life of the White group.]))
 (;W[mc]
 ;B[oe]
 ;W[rf]
 ;B[rg]
 ;W[qg]
 ;B[pg]
 ;W[qh]
 ;B[re]
 ;W[pf]
 ;B[sf]
 ;W[pe]
 ;B[of])
 (;W[pf]
 ;B[pe]LB[nd:B][oe:A]C['a' is less bad than 'b'.]
 (;W[oe]
 ;B[nd]
 ;W[qg]
 ;B[mb])
 (;W[nd]
 ;B[oe]
 ;W[mc]))))
 (;W[oe]
 ;B[nd]
 ;W[qb]
 ;B[nb]
 ;W[qc]
 ;B[oa]
 ;W[pf]
 ;B[pg]
 ;W[og]
 ;B[ph]LB[re:A]C[Later, Black 'a' is sente, so White does not yet live.]))
 (;B[qc]
 ;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]
 ;W[nc]
 ;B[pe]
 ;W[rf]
 ;B[oe]
 ;W[nb]
 ;B[rg]
 ;W[sb]
 ;B[qb]
 ;W[pa]
 ;B[re]
 ;W[pb])))
 (;B[qg]LB[oc:A][pe:B][pf:C][qf:D]C[
 -Space Low Pincer = Nikken Basami = Dukan Hyeopgong = E`r Jia
 ---------------------------------------------------------------
 White continues with 'a', 'b', 'c' or 'd'.
+]
 (;W[oc]LB[nc:A][pc:B]C['a' is simple, 'b' complicated.]
 (;B[nc]
 ;W[pc]
 ;B[nd]LB[pe:A][pf:B]C['a' is ok, 'b' is bad.]
 (;W[pe]LB[of:B][og:A]C['a' or 'b'.]
 (;B[og]C[
 * Joseki *])
 (;B[of]LB[re:A]C[Later, Black has 'a'.]))
 (;W[pf]
 ;B[qe]))
 (;B[pc]
 ;W[pd]
 ;B[qc]LB[nc:B][rc:A]C['a' wants the right, 'b' the top side.]
 (;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]
 ;W[nc]
 ;B[pe]LB[nb:B][oe:A]C['a' is possible, 'b' is questionable.]
 (;W[oe]
 ;B[nd]
 ;W[pf]
 ;B[ne]
 ;W[of]
 ;B[mc])
 (;W[nb]
 ;B[qe]
 ;W[qb]
 ;B[pb]
 ;W[ra]
 ;B[qa]
 ;W[sb]
 ;B[sa]
 ;W[oe]
 ;B[nd]
 ;W[ra]
 ;B[md]
 ;W[qb]
 ;B[mb]
 ;W[pa]
 ;B[mc]
 ;W[oa]C[White took 13 points in the corner, they don't equal White's
 influence.]))
 (;W[nc]
 ;B[rd]
 ;W[re]
 ;B[rc]
 ;W[oe]
 ;B[qe]
 ;W[nd]
 ;B[pe]
 ;W[of]
 ;B[pg])))
 (;W[pe]LB[qc:b][og:a][qg:3]C[Black continues with 'a' or 'b'. Black 'a' leaves options for later play. After Black 'b' Black 3 is in a bad position. Both moves end with Black sente.]
 (;B[og]
 ;W[oe]
 ;B[md]
 ;W[ne])
 (;B[qc]C[tsuke-hiki (attach to draw back)]
 ;W[rc]
 ;B[pc]
 ;W[re]
 ;B[og]
 ;W[oe]
 ;B[md]
 ;W[me]
 ;B[ld]
 ;W[pj]))
 (;W[pf]LB[qc:b][pg:a]C[Black may try 'a' or 'b'. Black 'b' abandons Black 3.]
 (;B[pg]LB[oc:A][of:B]C['a' is correct. 'b' is a mistake.]
 (;W[oc]LB[nc:a][pc:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[nc]
 ;W[pc]
 ;B[nd]
 ;W[qf]LB[of:A][og:B]C['a' or 'b'.]
 (;B[of]LB[og:a]C[There is later the cutting point at 'a'.])
 (;B[og]))
 (;B[pc]
 ;W[pd]
 ;B[qc]LB[nc:a][rc:b]C[White may continue with 'a' or 'b'.]
 (;W[nc]
 ;B[rd]
 ;W[oe]
 ;B[re]
 ;W[nd])
 (;W[rc]
 ;B[rb]
 ;W[rd]
 ;B[ob]
 ;W[nc]
 ;B[nb]
 ;W[mc])))
 (;W[of]
 ;B[qf]
 ;W[pe]
 ;B[md]))
 (;B[qc]C[tsuke-hiki (attach to draw back)]
 ;W[rc]
 ;B[pc]
 ;W[qf]
 ;B[rb]
 ;W[qi]))
 (;W[qf]LB[pf:A][pg:B]C['a' or 'b'.]
 (;B[pf]
 ;W[pg]LB[pf:5][qg:3]C[See the variation where 5 is played before 3 for this joseki.])
 (;B[pg]
 ;W[oe])))
 (;B[re]LB[pd:A][pe:C][qe:B]C[
 Low Shoulder Attack = Hikui Katatsuki
 -----------------------------------------
 White 'a' is correct and disadvantageous for Black. White 'b'
 leads to a low position. White 'c' is being tricked the most.
+]
 (;W[pd]LB[oc:B][oe:A]C['a' or 'b'.]
 (;B[oe]
 ;W[qf]
 ;B[pf]
 ;W[rf]
 ;B[pg]
 ;W[qh]
 ;B[oc]
 ;W[pb])
 (;B[oc]
 ;W[pf]LB[oe:A][qg:B]C['a' is correct, 'b' makes it worse for Black.]
 (;B[oe]
 ;W[qf]
 ;B[qb])
 (;B[qg]
 ;W[qf]
 ;B[rf]
 ;W[nf]
 ;B[ld]
 ;W[qi])))
 (;W[qe]
 ;B[qf]LB[rd:c][pe:b][pf:a]C[White continues with 'a' or 'b'. 'c' is inferior.]
 (;W[pf]
 ;B[pe]LB[rf:a][qg:b]C[White 'a' yields an equal result. White 'b' results in a big ko, the outcome uncertain.]
 (;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]LB[rd:B][of:C][rh:A]C['a' is correct, 'b' is too anxious.
 'c' gives Black profit.]
 (;W[rh]
 ;B[of]LB[pd:b][qi:a]C[White continues with 'a' or 'b'.]
 (;W[qi]
 ;B[qc]
 ;W[rd]
 ;B[pg]
 ;W[pc]
 ;B[oc]
 ;W[qb]
 ;B[pb]
 ;W[rc])
 (;W[pd]
 ;B[pg]
 ;W[oc]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[pc]
 ;B[ld]))
 (;W[rd]
 ;B[of])
 (;W[of]
 ;B[rd]
 ;W[qc]
 ;B[rc]
 ;W[qb]
 ;B[rh]
 ;W[oe]
 ;B[md]
 ;W[oc]))
 (;W[qg]
 ;B[rf]LB[pg:B][rg:A]C['a' is correct. 'b' is a mistake.]
 (;W[rg]
 ;B[rd]
 ;W[qc]
 ;B[rc]
 ;W[rb]
 ;B[qb]
 ;W[pb]
 ;B[qa]LB[pa:b][pc:a]C[White continues at 'a'. White 'b' is a mistake, as White ends in a big loss.]
 (;W[pc]
 ;B[sb]LB[nc:B][oe:A]C['a' makes a ko, 'b' takes thickness and sente for territory.]
 (;W[oe]
 ;B[of]
 ;W[pd]
 ;B[pg]
 ;W[ne]
 ;B[pe])
 (;W[nc]
 ;B[pg]
 ;W[of]
 ;B[ph]
 ;W[nd]
 ;B[qj]))
 (;W[pa]
 ;B[pc]
 ;W[ra]
 ;B[qb]
 ;W[qa]
 ;B[of]
 ;W[pg]
 ;B[ob]LB[sb:A][sf:B]
 (;W[sb]
 ;B[pd]
 ;W[qb]
 ;B[oa]
 ;W[sf]
 ;B[sc]
 ;W[se]
 ;B[sa])
 (;W[sf]
 ;B[pd]
 ;W[qb]
 ;B[oa]
 ;W[se]
 ;B[sb])))
 (;W[pg]
 ;B[rg]
 ;W[rh]
 ;B[qc]
 ;W[rd]
 ;B[rc]
 ;W[pd]
 ;B[pc]
 ;W[oe]
 ;B[sd]
 ;W[pe]
 ;B[nd]LB[qh:A]C[Aji for Black on 'a'.])))
 (;W[pe]C[This normally bad shape is a calm play here.]
 ;B[rd]
 ;W[qc]
 ;B[ne]
 ;W[pf]
 ;B[qg]
 ;W[nf]
 ;B[mf]
 ;W[ng]LB[me:a][qj:b]C[Black continues with 'a'. Black 'b' invites a cut at 'a' and a subsequent loss.]
 (;B[me]
 ;W[qi])
 (;B[qj]
 ;W[me]
 ;B[le]
 ;W[md]
 ;B[ld]
 ;W[mc]
 ;B[lc]
 ;W[lb]
 ;B[kb]
 ;W[nb]))
 (;W[rd]
 ;B[pf]
 ;W[oc]
 ;B[nc]
 ;W[pc]
 ;B[nd]TR[qe][qf]C[Without the marked stones the situation would be joseki, their exchange is bad for White.]))
 (;W[pe]C[White 4 is a mistake.]
 ;B[qc]LB[rc:a][rd:b]C[White 'a' and 'b' both give bad results for White.]
 (;W[rc]
 ;B[rd]
 ;W[pc]
 ;B[qb]
 ;W[pd]
 ;B[rb])
 (;W[rd]
 ;B[rc]
 ;W[rf]
 ;B[pd]
 ;W[qe]
 ;B[lc])))
 (;B[pd]LB[qc:A][qe:B]C['a' or 'b' give White a favorable result.
+]
 (;W[qc]
 ;B[qe]
 ;W[re]
 ;B[qf]
 ;W[rf]
 ;B[qh]
 ;W[qg]
 ;B[pg]
 ;W[rg]
 ;B[oh]
 ;W[ob]
 ;B[nc]
 ;W[nb]
 ;B[lc]
 ;W[ri]C[Black failed to close one side to the second line.
 ])
 (;W[qe]
 ;B[qc]
 ;W[rc]LB[pb:B][rb:A]C['a' or 'b'.
+]
 (;B[rb]
 ;W[qb]
 ;B[pc]
 ;W[sb]
 ;B[pf]LB[ra:A][jd:B]C[White has the choice to put Black's influence to the top with 'a' or the right with 'b'.
+]
 (;W[ra]
 ;B[jd]
 ;W[qf]
 ;B[pg]
 ;W[qh])
 (;W[jd]
 ;B[rd]
 ;W[ra]
 ;B[re]
 ;W[qf]
 ;B[qg]
 ;W[rf]
 ;B[rg]
 ;W[sd]
 ;B[pe]
 ;W[se]
 ;B[oh]))
 (;B[pb]
 ;W[qb]
 ;B[pc]
 ;W[qh]
 ;B[kd]))))
 (;W[qc]LB[pc:b][qd:d][pe:c][qe:a]TR[jc]C[
 San-san
 --------
 White plays the 3-3 when Black has a stone at top such as marked.
 Black continues with 'a' to 'c'.
 Black 'd' is possible, but not recommended.
 Outcomes:
 'a' - White corner, Black thickness.
 'b' - White on the right, Black top.
 'c' - White corner, Black sente.
 'd' - Black choice; ladder is important.
+]
 (;B[qe]LB[oc:A][pd:B]C[
 Knight's Move = Keima = Narincha = Fei
 ---------------------------------------
 White lives in the corner. Black gets thickness.
 'a' or 'b'.
+]
 (;W[oc]LB[nc:B][nd:A]C['a' or 'b' are ok.]
 (;B[nd]
 ;W[re]
 ;B[qf]
 ;W[nc]
 ;B[md]
 ;W[rf]
 ;B[qg]
 ;W[pd]
 ;B[pe]
 ;W[qd])
 (;B[nc]LB[nd:B][pd:A]C['a' is ok, 'b' is questionable.]
 (;W[pd]
 ;B[pe]
 ;W[nb]
 ;B[nd]
 ;W[mb]
 ;B[rc]C[Later]
 ;W[rb]
 ;B[pb]
 ;W[pc]
 ;B[rd]
 ;W[qb])
 (;W[nd]
 ;B[pc]
 ;W[ob]LB[pd:A][oe:B]C['a' starts a fight and gives White a small corner. 'b' needs the ladder.]
 (;B[pd]
 ;W[pb]
 ;B[mc]LB[rd:B][re:A]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qg]
 ;W[ne]
 ;B[kd]
 ;W[ng]C[The White corner is small.])
 (;W[rd]
 ;B[re]
 ;W[ne]
 ;B[ld]LB[rb:A][ng:B]C[Now, 'a' is necessary. After 'b' the White corner dies.]
 (;W[rb]
 ;B[og])
 (;W[ng]
 ;B[rb]
 ;W[qb]
 ;B[ra]
 ;W[rc]
 ;B[nb]
 ;W[sb]
 ;B[sd]
 ;W[oa]
 ;B[qa])))
 (;B[oe]
 ;W[pb]
 ;B[md]))))
 (;W[pd]
 ;B[pe]
 ;W[oc]LB[oc:6][pd:4]C[White 4 and 6 may also be played in different order.]
 ;B[nc]LB[nb:a][nd:b]C[
 * Joseki *
 White continues with 'a'. White 'b' is vulgar.]
 (;W[nb]LB[mc:b][nd:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[nd]
 ;W[mb]
 ;B[rc]C[Black 11 is post-joseki.]
 ;W[rb]
 ;B[pb]
 ;W[pc]
 ;B[rd]
 ;W[qb])
 (;B[mc]C[Black 9 is not recommended.]
 ;W[mb]LB[ob:B][lc:A]C['a' is correct. 'b' is a mistake.]
 (;B[lc]LB[oe:a]C[White has sente, and Black is left with the cutting point at 'a'.])
 (;B[ob]
 ;W[pc]
 ;B[lb]
 ;W[nd]LB[ma:A][oe:B]C['a' or 'b'.]
 (;B[ma]
 ;W[oe])
 (;B[oe]
 ;W[lc]
 ;B[md]
 ;W[ld]
 ;B[me]
 ;W[kb]))))
 (;W[nd]C[White 8 is insensible. This move helps Black fix his shape.]
 ;B[oe]LB[nb:a][mc:b]C[White continues with 'a'. White 'b' may be played if there is no Black extension (as shown).]
 (;W[nb]C[White plays 10 is Black has an extension at top as shown.]
 ;B[mc]
 ;W[mb]
 ;B[lc]LB[nd:8][oe:9]C[Black has superior thickness. White 8 is no threat; better to
 have reserved the cutting point at Black 9, like in the variation
 without these two stones.])
 (;W[mc]C[White may try 10 if there is no Black stone at top.]
 ;B[nb]LB[mb:B][ob:C][ld:A]C['a' is ok, 'b' is okay with the ladder, 'c' is not recommended.]MA[jc]
 (;W[ld]MA[jc]
 ;B[rc]LB[ob:A][rb:B]C['a' is correct. 'b' is a mistake.]MA[jc]
 (;W[ob]MA[jc]
 ;B[ne]MA[jc]
 ;W[md]MA[jc]
 ;B[qb]MA[jc])
 (;W[rb]
 ;B[pb]
 ;W[pc]
 ;B[qb]))
 (;W[mb]
 ;B[ob]
 ;W[pc]
 ;B[md]
 ;W[ne]
 ;B[nf]
 ;W[me]
 ;B[ld]
 ;W[pb]
 ;B[lf])
 (;W[ob]
 ;B[mb]
 ;W[lc]
 ;B[lb]
 ;W[kc]
 ;B[kb]
 ;W[jc]
 ;B[rc]
 ;W[rb]
 ;B[qd]
 ;W[qb]
 ;B[jb]LB[ic:B][rd:A]C['a' is correct, 'b' makes the mistake larger.]
 (;W[rd]
 ;B[ne]
 ;W[md]
 ;B[ic])
 (;W[ic]
 ;B[rd]
 ;W[ib]
 ;B[pc]
 ;W[pb]
 ;B[sb]
 ;W[ja]
 ;B[oa]
 ;W[na]
 ;B[ma]
 ;W[ka]
 ;B[ra]
 ;W[ia]
 ;B[qa]
 ;W[pd]
 ;B[pa]
 ;W[ne]))))))
 (;B[pc]LB[qd:A][qe:B]C[
 Kosumi-Tsuke = Diagonal Attachment
 --------------------------------------
 Black must have a stone at top to play this way.
 White 'a' or 'b' are possible.
+]
 (;W[qd]LB[pe:b][of:a]C[Black continues with 'a' or 'b'.]
 (;B[of]C[ikken tobi (1-space jump)]
 ;W[qg])
 (;B[pe]LB[qe:B][rf:A]C[
 Diagonal attack = Kata-tsuki
 ------------------------------
 'a' is correct, 'b' is questionable.]
 (;W[rf]LB[pg:a][qg:b]C[Black continues with 'a'. Black 'b' is an overplay.]
 (;B[pg]
 ;W[qh])
 (;B[qg]LB[qf:a][rg:b]C[Black 7 is an overplay. A fight ensues.
 White continues with 'a'. White 'b' is timid.]
 (;W[qf]
 ;B[pf]
 ;W[pg]
 ;B[qh]
 ;W[og]C[Unless Black has support, the fight favors White.])
 (;W[rg]C[White 8 is faint-hearted.]
 ;B[qh]LB[pf:b][qf:a][pg:c]C[White 'a', Black 'b', the White cut of 'c' is not longer much of a threat.])))
 (;W[qe]
 ;B[pf])))
 (;W[qe]LB[pc:3][od:1]C[Same variation as Black 1 and 3 played in reverse.]
 ;B[qb]
 ;W[qd]
 ;B[ob]
 ;W[qh]))
 (;B[pe]LB[ob:a][re:b][dp:c]C[
 Diagonal = Kosumi = Ibkucha = Jian
 -----------------------------------
 Black 3 seems vague, as it does not much affect White 2, but is a steady move to create thickness. Further, White does not have an easy continuation.
 Black plays this way to get sente.
 Locally, White continues with 'a' or 'b'. White can consider these two points miai, and play elsewhere ('c').
+]
 (;W[ob]
 ;B[qd]LB[mc:A][pc:B][rc:C]C['a' goes outside. 'b' and 'c' are enclosed in the corner.]
 (;W[mc]
 ;B[pc]
 ;W[pb]
 ;B[qb]
 ;W[rc]
 ;B[rb]
 ;W[oc]
 ;B[pd]
 ;W[nd])
 (;W[pc]LB[nb:c][mc:a][qi:b]C[The joseki ends.
 Black continues at 'a' locally, or extends down the right side.
 Black 'c' is an overplay.]
 (;B[mc]C[Black 7 is a logical continuation at top.])
 (;B[qi]C[A possible Black extension on the right.])
 (;B[nb]C[Black 7 is a mistake.]
 ;W[nc]
 ;B[oc]
 ;W[mb]
 ;B[pb]
 ;W[na]
 ;B[qb]
 ;W[nd]LB[rc:a][ne:b]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rc]
 ;AB[jc]TR[jc]C[With the marked previous stone the joseki was a mistake in direction.])
 (;B[ne]C[Black 15 is a mistake because the aji of the two White stones can result in a huge ko or outright loss.]
 ;W[rc]C[White 16 leads to a favorable ko for White at worst.]
 ;B[rb]LB[pd:a][rd:b]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[oe]
 ;W[rd]LB[qe:a][re:b]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[re]
 ;B[rf]LB[sb:b][sf:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[sf]LB[sc:c][rg:b][sg:a]C[Black 'a' gives a ko favorable to White.
 Black 'b' leads to an outright loss for Black in the corner, but preserves influence.
 Black 'c' is an outright mistake.]
 (;B[sg]C[Black 25 gives a ko favorable to White.]
 ;W[rg]
 ;B[se]
 ;W[qf]
 ;B[sc]
 ;W[sf]CR[rf]C[White wins, as connecting at the marked spot gives White the corner and destroys Black's thickness.])
 (;B[rg]C[Black 25 gives away the three stones, but preserves influence.]
 ;W[sb]
 ;B[ra]LB[pa:a][sc:b]C[Black 27 gives Black the most liberties possible.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[pa]
 ;B[se]LB[oa:a][sc:b][sd:c]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
 (;W[oa])
 (;W[sc]
 ;B[sg]
 ;W[oa]
 ;B[sf]
 ;W[qa])
 (;W[sd]C[White 30 is a mistake.]
 ;B[sg]
 ;W[oa]
 ;B[se]C[White must find a ko threat.]))
 (;W[sc]C[White 28 is a mistake.]
 ;B[pa]C[Black 29 seals White's fate.]
 ;W[oa]
 ;B[se]
 ;W[sd]))
 (;B[sc]C[Black 25 is a mistake.]
 ;W[rg]
 ;B[qf]
 ;W[se]))
 (;W[sb]C[White 24 is a mistake.]
 ;B[se]
 ;W[sc]
 ;B[ra]
 ;W[pa]
 ;B[sf]
 ;W[oa]
 ;B[sd]))
 (;B[re]
 ;W[qe]
 ;B[qf]LB[pd:18][rd:20][oe:19][qe:22][re:21]C[See for continuation the variation where White 20 is played before White 18.]))
 (;W[rd]
 ;B[re]
 ;W[pd]
 ;B[oe]
 ;W[qe]
 ;B[qf]LB[qf:23]
 ;W[sb]
 ;B[ra]LB[pa:b][sc:a]C[Black 25 gives Black the most possible liberties.
 White may try 'a' or 'b'.]
 (;W[sc]
 ;B[pa]
 ;W[oa]
 ;B[qd]C[White must find the first ko threat.])
 (;W[pa]
 ;B[qd]
 ;W[se]
 ;B[sf]
 ;W[qe]LB[sd:b][rf:a]C[Black continues with 'a' or 'b'.]
 (;B[rf]
 ;W[sc]
 ;B[sd]
 ;W[oa]
 ;B[qd]
 ;W[se])
 (;B[sd]LB[oa:a][sc:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[oa]
 ;B[se]
 ;W[qa])
 (;W[sc]C[White 32 is a mistake.]
 ;B[se]
 ;W[oa]
 ;B[qd]C[White must find a ko threat.])))))))
 (;W[rc]C[White 6 overemphasizes the corner.]
 ;B[nb]LB[nc:b][oc:a]C[Black 7 is a severe move. White must continue with 'a'. White 'b' is a mistake.]
 (;W[oc]C[White has no choice but to seek life in the corner this way.]
 ;B[nc]
 ;W[rd]
 ;B[re]LB[pc:A][nd:B]
 (;W[pc]C[White 12 is necessary.]
 ;B[nd])
 (;W[nd]C[White 12 is a mistake. Black gets a ko fight for White's group in the corner.]
 ;B[oa]C[A ko fight ensues.]))
 (;W[nc]C[White 8 is a mistake.]
 ;B[pb]
 ;W[mb]
 ;B[pc])))
 (;W[re])
 (;W[]TR[jc]C[White plays elsewhere. This is not recommended if Black has an extension at top as marked.]
 ;B[qd]LB[ob:a][pc:b]C[White continues with 'a' or 'b'.]
 (;W[ob]LB[mc:a][rc:b]C['a' and 'b' are miai.]
 (;B[rc]
 ;W[mc])
 (;B[mc]
 ;W[rc]))
 (;W[pc]
 ;B[oc]
 ;W[rb]C[White 7 is a tesuji to live in the corner.]
 ;B[rd]
 ;W[ob]
 ;B[nb]LB[pa:b][qa:a]C[White continues with 'a'. White 'b' leaves White open to a ko threat.]
 (;W[qa])
 (;W[pa]C[Black can force a ko if White plays 11 here.]))))
 (;B[qd]LB[rd:B][qe:A]C[
 Jump-Attach = Tobi-Tsuke
 ---------------------------
 Black 3 is possible, but is not recommended.
 'a' is correct, 'b' leads to a low position.
+]
 (;W[qe]LB[pd:a][rd:b]C[Black 4 is better than a hane below Black 3 ('b').
 Black continues with 'a'. Black 'b' is unthinkable.]
 (;B[pd]
 ;W[rd]LB[rc:a][re:b]TR[od]C[THe triangled stone now is in bad position.
 Black plays 'a' when the ladder to capture White 4 is favorable.
 If that ladder is unfavorable, Black plays 'b'.]
 (;B[rc]
 ;W[rb]
 ;B[re]
 ;W[sc]
 ;B[qf]LB[ob:a][dp:b]C[White continues with 'a'. White cannot afford to play elsewhere ('b').]
 (;W[ob]
 ;B[pe]TR[od]C[The marked stone is now meaningless.])
 (;W[]C[White plays elsewhere, a mistake.]
 ;B[pb]
 ;W[qb]C[Painful sente move]))
 (;B[re]C[Black plays this way when White 4 cannot be caught in a ladder.]
 ;W[rf]
 ;B[rc]
 ;W[se]
 ;B[qb]
 ;W[ph]C[White gets a nice position on the right.]))
 (;B[rd]C[Black 5 is unreasonable.]
 ;W[pd]LB[pc:a][pe:b]C['a' and 'b' are miai. White gains advantage either way.]
 (;B[pc]
 ;W[pe]
 ;B[qb]
 ;W[oc]
 ;B[pb]
 ;W[nd]LB[nc:A]C[Continuation for Black on 'a'.])
 (;B[pe]
 ;W[pc]LB[pf:B][qf:A]C['a' or 'b'.]
 (;B[qf]
 ;W[oe]
 ;B[pf]
 ;W[nd]
 ;B[of]
 ;W[ne])
 (;B[pf]
 ;W[oc]
 ;B[nd]
 ;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qh]))))
 (;W[rd]
 ;B[qe]
 ;W[pc]
 ;B[oc]
 ;W[re]
 ;B[qg]
 ;W[rf]
 ;B[og])))
 (;W[dp]LB[qc:C][qd:A][qe:B]TR[kc][lc]C[
 Tenuki
 -------
 'a' or 'b'.
 'c' is bad, unless Black already has a stone on one of the triangled spots.
+]
 (;B[qd]C[This variation is covered as Komoku-Tenuki-Takamoku.])
 (;B[qe]LB[qc:B][qd:A][pp:C]C[
 Takageima Shimari
 --------------------
 'a' is the correct invasion. 'b' is inferior.
 After another tenuki 'c' Black can secure his corner completely.
+]
 (;W[qd]LB[qc:B][pd:A]C['a' takes the outside, 'b' the corner.]
 (;B[pd]
 ;W[qc]
 ;B[re]
 ;W[ob]LB[nb:B][nc:A]C['a' is correct, 'b' is a mistake: White sacrifices two stones
 and reduces in sente.]
 (;B[nc]
 ;W[nb]
 ;B[lc]
 ;W[rb]C[White lives in gote.])
 (;B[nb]
 ;W[nc]
 ;B[pb]
 ;W[mb]
 ;B[pc]))
 (;B[qc]
 ;W[pd]
 ;B[pc]
 ;W[pe]
 ;B[rd]
 ;W[re]
 ;B[qf]
 ;W[oe]
 ;B[rc]
 ;W[nd]
 ;B[oc]
 ;W[pg]
 ;B[rf]
 ;W[ng]))
 (;W[qc]LB[pb:B][pc:A]C['a' encloses White, 'b' drives him out.]
 (;B[pc]
 ;W[qd]
 ;B[pe]
 ;W[rb]
 ;B[pb]
 ;W[re]
 ;B[rf]
 ;W[sc]
 ;B[rd]
 ;W[se]
 ;B[qb]
 ;W[ra])
 (;B[pb]LB[qb:A][re:B]C['a' is correct, 'b' a mistake.]
 (;W[qb]
 ;B[pc]
 ;W[re]LB[rd:A][rf:B]C['a' drives White out, 'b' encloses him.]
 (;B[rd]
 ;W[qd]
 ;B[rf]
 ;W[pe]
 ;B[qf]
 ;W[pd]
 ;B[nc]
 ;W[rc]
 ;B[se])
 (;B[rf]
 ;W[rd]
 ;B[qf]
 ;W[sc]
 ;B[se]
 ;W[rb]))
 (;W[re]
 ;B[rf]
 ;W[rd]
 ;B[qf]
 ;W[qb]
 ;B[se]
 ;W[sc]
 ;B[rb]
 ;W[ra]
 ;B[sb]
 ;W[pc]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[nd]
 ;B[mc]
 ;W[oe]
 ;B[pd])))
 (;W[pp]
 ;B[nc]))
 (;B[qc]
 ;W[mc]LB[qc:3]TR[qd]C[Black has no move to secure an efficient amount of territory.
 If he'd like to make a light moyo with a wide extension, White 3 on the triangled position would be much better shape.])))
 (;B[nc]LB[pd:B][qd:A]C[
 Oomokuhazushi = 6-3 Point
 ------------------------------
 The large mokuhazushi point (6-3), a remnant of the "new fuseki" movement in Japan in the 1930's. As an initial corner point, its popular usage has not stood the test of time.
 'a' or 'b'.
+]
 (;W[qd]LB[qb:b][qc:a]C[
 -4 = Komoku
 ----------
 Black continues with 'a' or 'b'.
+]
 (;B[qc]LB[pc:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]LB[pc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]LB[rb:c][re:a][pf:b]C[White continues with 'a' to 'c'.]
 (;W[re])
 (;W[pf]
 ;B[rb]
 ;W[qi])
 (;W[rb]
 ;B[qf]
 ;W[qe]
 ;B[pf]
 ;W[od]
 ;B[mc]
 ;W[oc]
 ;B[ob]
 ;W[ne]
 ;B[kd]))
 (;B[pd]LB[pc:b][qe:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qe]LB[rb:b][pc:a]C[Black continues with 'a' or 'b'.]
 (;B[pc]
 ;W[rb])
 (;B[rb]LB[qb:a][pc:b]C[White continues with 'a' (a forcing move). White 'b' is a change of direction that results in Black's favor.]
 (;W[qb]C[White 8 is a simple forcing move.]
 ;B[pc]
 ;W[sb]
 ;B[pf])
 (;W[pc]C[White 8 aims to take the top, but is not recommended.]
 ;B[qb]
 ;W[od]
 ;B[pe]
 ;W[oc]
 ;B[oe]
 ;W[nd]
 ;B[qf]
 ;W[rf]
 ;B[rg]LB[pf:a][qg:b]C[White continues with 'a' or 'b'.]
 (;W[pf]
 ;B[qg]
 ;W[nf]
 ;B[of]
 ;W[og]
 ;B[pg]
 ;W[ne]
 ;B[pf]
 ;W[oh])
 (;W[qg]C[White plays 18 to fight for life with a ko.]
 ;B[pf]
 ;W[re]
 ;B[rh]
 ;W[sb]
 ;B[sd]
 ;W[sc]
 ;B[sf]
 ;W[rd]
 ;B[sg]
 ;W[se]
 ;B[sa]
 ;W[ra]
 ;B[qa]))))
 (;W[pc]
 ;B[qb]
 ;W[pe]
 ;B[od]
 ;W[re]
 ;B[rb]
 ;W[sb]
 ;B[pb]
 ;W[pg])))
 (;W[pc]
 ;B[pd]LB[qb:a][od:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[qb]
 ;B[rc]
 ;W[od]LB[pb:B][pe:A]C['a' is correct, 'b' is not recommended.]
 (;B[pe]
 ;W[oc]
 ;B[rb]LB[nd:B][pg:A]C['a' or 'b' are ok.]
 (;W[pg]
 ;B[of]LB[nd:a][og:b]C[White continues with 'a' or 'b'.]
 (;W[nd]
 ;B[og]
 ;W[kc]
 ;B[ph])
 (;W[og]
 ;B[nf]
 ;W[mc]
 ;B[qe]
 ;W[rf]
 ;B[re]
 ;W[qk]))
 (;W[nd]
 ;B[pg]
 ;W[kd]))
 (;B[pb]
 ;W[pe]
 ;B[oc]
 ;W[pd]
 ;B[rb]
 ;W[ob]
 ;B[qa]
 ;W[md]
 ;B[nb]C[The White thickness and sente are more valuable than the small Black corner.]))
 (;W[od]C[White 6 is not recommended.]
 ;B[pe]LB[qb:a][oc:b]C[White continues with 'a' or 'b'.]
 (;W[qb]
 ;B[oc]
 ;W[rc]
 ;B[pb]
 ;W[qc]
 ;B[ne])
 (;W[oc]
 ;B[qe]
 ;W[qb]
 ;B[rd]
 ;W[rc]
 ;B[ld]
 ;W[nd]
 ;B[qi]))))
 (;B[qb]LB[pd:c][qg:a][ph:b]C[White continues with 'a' to 'c'.]
 (;W[qg]
 ;B[kc])
 (;W[ph]
 ;B[ne]
 ;W[pd]
 ;B[oc]
 ;W[rb]
 ;B[jc])
 (;W[pd]
 ;B[oc]
 ;W[qh]
 ;B[rc]
 ;W[rd])))
 (;W[pd]C[
 -4 = Hoshi
 -------
+]
 ;B[qf]
 ;W[pf]
 ;B[pg]
 ;W[of]LB[qc:B][qe:A]C['a' or 'b'.]
 (;B[qe]
 ;W[qd]
 ;B[og]
 ;W[ng]LB[pe:A][nf:B]C['a' or 'b'.]
 (;B[pe]
 ;W[oe]
 ;B[od]
 ;W[qg]
 ;B[rd]
 ;W[rc]
 ;B[re]
 ;W[rg]
 ;B[nf]
 ;W[ne]
 ;B[me]
 ;W[mf]
 ;B[nd]
 ;W[nf]
 ;B[qc]LB[pc:B][oh:A]C['a' is correct, 'b' doesn't work.]
 (;W[oh])
 (;W[pc]
 ;B[qb]
 ;W[pb]
 ;B[rb]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[lc]))
 (;B[nf]
 ;W[nd]
 ;B[md]
 ;W[me]
 ;B[mf]
 ;W[le]))
 (;B[qc]
 ;W[qe]
 ;B[qg]
 ;W[pc]
 ;B[pb]
 ;W[rb]
 ;B[qb]
 ;W[rc])))
 (;B[nd]LB[pc:c][qc:d][pd:a][qd:b][pe:f][qe:e][dp:g]C[
 -4 Point = Ootakamoku = Chaogao
 ---------------------------------------
 The large takamoku (high) point (6-4), experimented with during the "new fuseki" movement in Japan in the 1930's. This point is seldom played as the initial corner point nowadays.
 White continues with 'a' to 'f'.
 Tenuki 'g' is also possible.
+]
 (;W[pd]LB[pc:d][qd:c][pe:b][pf:a]C[Black continues with 'a' or 'b'.
 'c' is not recommended.
 'd' is possible.
+]
 (;B[pf]LB[nd:1][pd:2][pf:3]C[See the variation starting with the 4-4-point, where after the high near approach move tenuki occurs, followed by the second kakari.])
 (;B[pe]
 ;W[qe]LB[qd:c][pf:b][qf:a]C[Black continues with 'a' to 'c'.]
 (;B[qf]LB[qd:b][oe:a][pf:c]C[White continues with 'a' or 'b'. White 'c' is an overplay.]
 (;W[oe]
 ;B[pf]
 ;W[od]
 ;B[qd]
 ;W[qc]
 ;B[re]
 ;W[rc]
 ;B[nb]
 ;W[ob]
 ;B[jc])
 (;W[qd]LB[oe:b][pf:a]C[Black continues with 'a' or 'b'.]
 (;B[pf]
 ;W[od]
 ;B[ne]
 ;W[nb]
 ;B[mb]
 ;W[ob]
 ;B[mc])
 (;B[oe]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]))
 (;W[pf]C[White 6 is an overplay.]
 ;B[oe]
 ;W[qg]
 ;B[rf]
 ;W[qd]
 ;B[qh]
 ;W[of]
 ;B[rg]
 ;W[nf]
 ;B[nc]
 ;W[pb]
 ;B[kd]))
 (;B[pf]LB[od:a][qf:b]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[od]
 ;B[ne]
 ;W[qf]LB[qd:b][qg:a]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[qg]
 ;W[qd]
 ;B[pg]
 ;W[nb]
 ;B[nc]
 ;W[ob]
 ;B[lc])
 (;B[qd]C[Black 9 is not recommended, as Black gains no advantage.]
 ;W[qc]
 ;B[rd]
 ;W[rc]
 ;B[qg]
 ;W[re]C[Black still has to cover the potential cutting point. This variation is not favorable to Black.]MA[pg]))
 (;W[qf]C[White 6 is not recommended.]
 ;B[qd]
 ;W[pc]
 ;B[rd]
 ;W[qg]
 ;B[qb]
 ;W[pb]
 ;B[qc]
 ;W[oe]
 ;B[pg]
 ;W[od]
 ;B[qh]
 ;W[rh]
 ;B[qi]C[The Black group in the corner may not live, but White is split in two, and the White group at right must crawl along the second line, to gain liberties, giving Black favorable thickness.]))
 (;B[qd]C[Black 5 results in Black building a moyo on the right, while White builds a moyo at top.]
 ;W[qc]
 ;B[rd]
 ;W[oe]
 ;B[pf]
 ;W[od]
 ;B[rc]
 ;W[pb]
 ;B[qf]
 ;W[of]
 ;B[og]
 ;W[ng]
 ;B[oh]
 ;W[nh]
 ;B[oi]
 ;W[jd]
 ;B[ni]
 ;W[lh]))
 (;B[qd]
 ;W[qc]
 ;B[pe]
 ;W[pc]
 ;B[re]
 ;W[rd]
 ;B[qe]
 ;W[nb]LB[pi:A][dp:B]C['a' is correct, tenuki 'b' is not recommended.]
 (;B[pi])
 (;B[dp]
 ;W[oe]
 ;B[od]
 ;W[of]LB[me:A][qh:B]C['a' or 'b'.]
 (;B[me]
 ;W[qg]
 ;B[rg]
 ;W[rh]
 ;B[rf]
 ;W[ph]
 ;B[qi]
 ;W[qh]
 ;B[rc]
 ;W[rb]
 ;B[sd]
 ;W[sb]
 ;B[sc])
 (;B[qh]
 ;W[me])))
 (;B[pc]
 ;W[qc]
 ;B[oc]
 ;W[qd]
 ;B[jc]
 ;W[qh]))
 (;W[qd]LB[qc:a][pd:b]C[Black continues with 'a' or 'b'.
+]
 (;B[qc]LB[pc:b][rc:a]C[White continues with 'a' or 'b'.]
 (;W[rc]LB[pc:a][pd:b]C[Black continues with 'a' or 'b'.]
 (;B[pc]LB[pd:c][re:a][qg:b]C[White continues with 'a' to 'c'.]
 (;W[re]
 ;B[jc])
 (;W[qg]
 ;B[rb]
 ;W[qj])
 (;W[pd]LB[rb:B][od:A][rd:C]C['a' settles on the top, giving the right.
 'b' has various outcomes.
 'c' is a mistake.]
 (;B[od]
 ;W[pb]
 ;B[qb]
 ;W[rb]
 ;B[ob]
 ;W[pf])
 (;B[rb]LB[oc:A][od:B]C['a' initiates the cut.
 'b' makes a big wall, but Black's shape is better.]
 (;W[oc]
 ;B[od]
 ;W[ob]LB[pb:B][rd:A]C['a' or 'b',]
 (;B[rd]LB[qb:B][re:A]C['a' or 'b'.]
 (;W[re]
 ;B[sc]
 ;W[mc]
 ;B[pf]
 ;W[qf]
 ;B[pe]
 ;W[qe]
 ;B[pg]
 ;W[qh]
 ;B[md]
 ;W[lc]
 ;B[qg]
 ;W[rg]
 ;B[se]
 ;W[rf]
 ;B[oi]
 ;W[qj]
 ;B[ke]
 ;W[jc])
 (;W[qb]
 ;B[sc]
 ;W[pb]
 ;B[rc]
 ;W[qf]
 ;B[re]
 ;W[of]
 ;B[mc]
 ;W[mb]
 ;B[lb]
 ;W[nc]
 ;B[ld]
 ;W[na]
 ;B[rf]
 ;W[qg]
 ;B[hc]
 ;W[rg]
 ;B[ra]
 ;W[pk]))
 (;B[pb]
 ;W[pa]
 ;B[qb]
 ;W[mc]
 ;B[md]
 ;W[lc]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[pf]
 ;B[ng]
 ;W[qj]))
 (;W[od]
 ;B[oc]
 ;W[ne]
 ;B[me]
 ;W[md]
 ;B[nc]
 ;W[nf]
 ;B[le]
 ;W[pj]
 ;B[rd]
 ;W[re]
 ;B[sc]
 ;W[qf]))
 (;B[rd]LB[rb:B][oc:A][re:C]C['a' avoids being tricked making a wall around a small corner.
 'b' destroys Black's position, but needs the ladder.
 'c' is bad.]
 (;W[oc]
 ;B[rb]
 ;W[pb]
 ;B[qb]
 ;W[re]
 ;B[sc]
 ;W[od])
 (;W[rb]
 ;B[re]
 ;W[qf]
 ;B[rf]
 ;W[qg]
 ;B[rg]
 ;W[qh]
 ;B[od]LB[pb:B][qe:A]C['a' if Black has the ladder, 'b' if White has the ladder.]
 (;W[qe]
 ;B[qb]
 ;W[ra]
 ;B[qa]
 ;W[rh]
 ;B[sc]
 ;W[sg]
 ;B[sb]
 ;W[sf])
 (;W[pb]
 ;B[qe]
 ;W[pe]
 ;B[pf]
 ;W[oe]
 ;B[of]
 ;W[ne]
 ;B[me]))
 (;W[re]
 ;B[rb]
 ;W[sd]
 ;B[od]))))
 (;B[pd]
 ;W[pe]
 ;B[pc]
 ;W[re]
 ;B[oe]
 ;W[pf]))
 (;W[pc]
 ;B[pd]LB[ob:d][pb:c][rc:b][od:a]C[White continues with 'a' to take the corner or top, 'b' to emphasize the right, 'c' to take the corner, or 'd' for influence at top, or possibly the right.]
 (;W[od]C[White 6 emphasizes the corner or top.]
 ;B[pe]
 ;W[oc]
 ;B[oe]LB[qb:b][rc:a]C[White continues with 'a' to take the corner, or 'b' to emphasize the top.]
 (;W[rc]
 ;B[qb]
 ;W[rb]LB[rd:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[rd]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[mf])
 (;B[rd]
 ;W[qe]
 ;B[qf]
 ;W[re]
 ;B[rf]
 ;W[sd]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[qa]
 ;B[ne]))
 (;W[qb]
 ;B[rc]
 ;W[rb]
 ;B[rd]
 ;W[mb]
 ;B[qj]))
 (;W[rc]C[White 6 emphasizes the right.]
 ;B[qb]
 ;W[pe]
 ;B[od]
 ;W[re]
 ;B[rb]
 ;W[sb]
 ;B[ob]
 ;W[pg])
 (;W[pb]LB[qb:a][qe:b]C[Black continues with 'a' or 'b', but 'a' is preferred.]
 (;B[qb]LB[rb:b][rd:a]C[White continues with 'a' or 'b'.]
 (;W[rd]
 ;B[oc]
 ;W[pe]
 ;B[od]
 ;W[rb]
 ;B[ob]
 ;W[rc]
 ;B[pa]
 ;W[qh])
 (;W[rb]LB[rc:a][rd:b]C[Black continues with 'a' or 'b'.]
 (;B[rc]LB[od:A][rd:B]C['a' or 'b'.]
 (;W[od]
 ;B[pe]
 ;W[oe]
 ;B[of]
 ;W[oc]
 ;B[qe]
 ;W[ne]
 ;B[pg]
 ;W[kc]LB[qa:A]C[In the endgame White 'a' is sente.])
 (;W[rd]LB[ra:b][sb:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[sb]
 ;W[ra]
 ;B[qa]
 ;W[nb]LB[od:b][pe:a]C[Black continues with 'a'.
 Black 'b' is not recommended.]
 (;B[pe]LB[sd:a][qf:b][rf:c]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
 (;W[sd]LB[mb:b][qe:a]C[Black plays 'a' to emphasize the right, 'b' to emphasize the top.]
 (;B[qe]C[Black 17 emphasizes the right.]
 ;W[sc]
 ;B[sa]
 ;W[rb]
 ;B[re]
 ;W[ra]
 ;B[se]
 ;W[pa])
 (;B[mb]C[Black 17 emphasizes the top.]
 ;W[sc]
 ;B[sa]
 ;W[rb]
 ;B[nc]))
 (;W[qf]C[White 16 is a mistake.]
 ;B[mb]
 ;W[sd]
 ;B[sa]
 ;W[qe]
 ;B[oc]
 ;W[ob]
 ;B[nc])
 (;W[rf]C[White 16 is a mistake.]
 ;B[qf]
 ;W[re]
 ;B[mb]
 ;W[sd]
 ;B[nc]
 ;W[ob]
 ;B[qh]))
 (;B[od]LB[sd:b][qf:a]C[Black 15 is not recommended, though White must play correctly to get a favorable result.
 White continues with 'a'. White 'b' is a mistake.]
 (;W[qf]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[oa]
 ;B[mb]
 ;W[lb]
 ;B[sa]
 ;W[pa]LB[ma:B][pf:A]
 (;B[pf]LB[sd:b][pe:a]C[White 'a' sacrifices the corner for the center and right side.
 White 'b' takes the corner, scraficing the center.]
 (;W[pe]C[White sacrifices for the right side and center.]
 ;B[oe]
 ;W[qe]LB[ma:b][of:c][qg:a]C[Black continues with 'a' to 'c'.
 Black 'b' requires a ladder block to the lower left corner.]
 (;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[pg]
 ;B[of]
 ;W[qh]
 ;B[ma]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[kb]
 ;W[ld]
 ;B[la]
 ;W[mg])
 (;B[ma]C[Black 29 is unreasonable without a ladder block to the lower left.]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[kb]
 ;W[of]
 ;B[ne]
 ;W[ld])
 (;B[of]C[Black 29 is slow but sure.]
 ;W[mc]
 ;B[qg]
 ;W[rg]
 ;B[rh]
 ;W[qh]
 ;B[pg]
 ;W[rf]
 ;B[ri]
 ;W[sd]))
 (;W[sd]C[White takes the corner.]
 ;B[qg]
 ;W[qe]
 ;B[ma]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[kb]
 ;W[sc]
 ;B[me]
 ;W[ld]
 ;B[la]
 ;W[rb]
 ;B[ke]))
 (;B[ma]
 ;W[mc]
 ;B[lc]
 ;W[md]
 ;B[kb]LB[ld:a][ne:b]C[White plays 'a' for thickness and the right side, or 'b' to take the top at the expense of the right side.]
 (;W[ld]C[White plays 30 for thickness and the right side.]
 ;B[la]
 ;W[ne]
 ;B[pe]
 ;W[pf]
 ;B[na])
 (;W[ne]C[White plays 30 to take the top.]
 ;B[me]
 ;W[ld]
 ;B[nf]
 ;W[kc]
 ;B[la]
 ;W[jb]
 ;B[lc]
 ;W[pe]
 ;B[oe]
 ;W[of]
 ;B[ne]
 ;W[lb]
 ;B[og]
 ;W[ka]
 ;B[qg]
 ;W[rg]
 ;B[pf]
 ;W[rf])))
 (;W[sd]C[White 16 is a mistake.]
 ;B[sa]
 ;W[mb]
 ;B[qe]
 ;W[rf]
 ;B[re]
 ;W[se]
 ;B[qf]
 ;W[rg]
 ;B[qh]LB[qg:b][rh:a]C[White dies quickly with 'a', or crawls along the second line (the "line of defeat") with 'b' to live in agony.]
 (;W[rh]
 ;B[sf]C[White dies.]
 ;W[sg]
 ;B[sc]
 ;W[sf]
 ;B[ri])
 (;W[qg]
 ;B[pg]
 ;W[pf]
 ;B[pe]
 ;W[ph]
 ;B[og]
 ;W[rh]
 ;B[sf]
 ;W[sg]
 ;B[qi]
 ;W[ri]
 ;B[qj]
 ;W[rj]
 ;B[qk]
 ;W[rk]
 ;B[ql]
 ;W[rl]
 ;B[qm]))))
 (;B[ra]C[Black 11 is a mistake.]
 ;W[sb]
 ;B[sc]LB[pa:a][nb:b]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pa]
 ;B[pe]LB[qa:A][rf:B]
 (;W[qa]
 ;B[sa]
 ;W[rb]LB[oc:b][re:a]C[Black plays 'a' to emphasize the right, 'b' to emphasize the top.]
 (;B[re]
 ;W[sb]
 ;B[qe]
 ;W[sd])
 (;B[oc]
 ;W[]C[White plays elsewhere.]
 ;B[ob]
 ;W[sb]
 ;B[oa]
 ;W[sd]))
 (;W[rf]C[White 16 is a mistake.]
 ;B[sa]LB[oc:b][re:a]C['a' and 'b' are miai.]))
 (;W[nb]C[White 14 is a mistake.]
 ;B[pe]LB[qf:a][rf:b]C[White may try 'a' or 'b'.]
 (;W[qf]
 ;B[mb]
 ;W[pa]
 ;B[qe]
 ;W[re]
 ;B[rf]
 ;W[rg]
 ;B[oc])
 (;W[rf]
 ;B[sa]LB[mb:b][re:a]C['a' and 'b' are miai.])))))
 (;B[rd]
 ;W[qe]
 ;B[rc]
 ;W[nb]LB[pa:b][pe:a]C[Black continues with 'a' or 'b'.]
 (;B[pe]
 ;W[qf]LB[sb:a][pf:b]C[Black plays 'a' to take the corner, and 'b' for influence toward the top.]
 (;B[sb]
 ;W[lc]
 ;B[og])
 (;B[pf]
 ;W[qg]
 ;B[pg]
 ;W[qh]
 ;B[mb]
 ;W[qa]LB[ra:b][nc:a]C[Black gives away the corner straight-away with 'a', or plays a ko for the corner with 'b'.]
 (;B[nc]
 ;W[re]
 ;B[ob])
 (;B[ra]C[Black 21 forces a ko fight for the corner.]
 ;W[sa]
 ;B[sb]
 ;W[sc]
 ;B[sd]
 ;W[re]
 ;B[sb]
 ;W[nc]
 ;B[mc]
 ;W[sc])))
 (;B[pa]LB[lc:b][nc:a]C[White continues with 'a'. White 'b' is an overplay.]
 (;W[nc]
 ;B[od]
 ;W[re]
 ;B[sb]
 ;W[md]
 ;B[me]
 ;W[ld]
 ;B[le]
 ;W[kd]
 ;B[ph]
 ;W[ke])
 (;W[lc]C[White 'b' is an overplay.]
 ;B[pe]
 ;W[qf]
 ;B[mb]LB[mc:b][nc:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[nc]
 ;B[pf]
 ;W[md]
 ;B[qg])
 (;W[mc]C[White 18 is a mistake.]
 ;B[ob]
 ;W[oc]
 ;B[nc]
 ;W[oa]
 ;B[qa]))))))
 (;B[qe]
 ;W[rd]
 ;B[pe]
 ;W[rc]))
 (;W[ob]C[Almost ironically, White 6 aims at influence at the top.]
 ;B[qe]
 ;W[rd]
 ;B[qb]LB[od:a][re:b]C[White plays 'a' for influence at top, or 'b' for territory on the right side.]
 (;W[od]
 ;B[pe]
 ;W[oe]
 ;B[re])
 (;W[re]
 ;B[oc]
 ;W[pb]
 ;B[nb]
 ;W[pe]
 ;B[od]
 ;W[rb]
 ;B[oa]
 ;W[rc]
 ;B[pa]
 ;W[qf]))))
 (;B[pd]))
 (;W[pc]
 ;B[pd]
 ;W[qc]LB[oc:a][qd:b]C[Black continues with 'a' to emphasize the top, 'b' to emphasize the right side.]
 (;B[oc]
 ;W[qd]
 ;B[pe]
 ;W[qe]
 ;B[pf]
 ;W[qg])
 (;B[qd]
 ;W[od]
 ;B[oe]
 ;W[oc]
 ;B[ne]
 ;W[nc]
 ;B[ld]
 ;W[pe]
 ;B[pf]
 ;W[qe]
 ;B[rd]
 ;W[rf]
 ;B[rg]
 ;W[re]
 ;B[qh]))
 (;W[qc]LB[pd:b][qe:a]C[Black continues with 'a' or'b'.]
 (;B[qe])
 (;B[pd]
 ;W[re]
 ;B[pc]
 ;W[qb]
 ;B[qf]LB[qe:b][rf:a]C[White continues with 'a' peaceably, or 'b' to cut and start a fight.]
 (;W[rf]
 ;B[qg]
 ;W[pb])
 (;W[qe]C[kiri (cut)]
 ;B[pe]
 ;W[pf]
 ;B[qh]
 ;W[of]
 ;B[rf]
 ;W[pb]
 ;B[qd]
 ;W[rd]
 ;B[ob]
 ;W[sc]
 ;B[ld])))
 (;W[qe]
 ;B[pd]
 ;W[rc]
 ;B[pf]
 ;W[qf]
 ;B[pg]
 ;W[rh])
 (;W[pe]
 ;B[pd]
 ;W[qd]
 ;B[qc]
 (;W[re]
 ;B[rc]
 ;W[od]
 ;B[pc]
 ;W[oe]
 ;B[oc]
 ;W[qi]C[Joseki])
 (;W[rc]
 (;B[pc]
 ;W[re]
 ;B[oe]
 ;W[pf]C[Joseki])
 (;B[qe]
 ;W[rd]
 ;B[qf]
 ;W[pc]
 ;B[od]
 ;W[pb]LB[of:A][og:B]C[Joseki
 Black can defend at 'a' or 'b' now or consider tenuki])))
 (;W[]
 ;B[qd]C[This variation is covered as Komoku-Tenuki variation.]))
 (;B[oe]LB[qc:a][pd:e][qd:b][qe:c][qf:d]C[
 -5 Point = Go-no-go = Wu~wu~
 -----------------------------------
 The 5-5 was experimented with briefly during the "New Fuseki" movement in Japan in the 1930s. The 5-5 point has not retained popularity because the 4-4 hoshi (star) point strikes a better balance between influence and territory. As one can see from the variations, though, the 5-5 is playable.
 White responds with 'a' to 'e'.
+]
 (;W[qc]LB[oc:a][pc:b]C[Best plan for White.
 -3 = San-san
 --------
 Black continues with 'a' or 'b'.
+]
 (;B[oc]LB[qe:a][qf:b]C[White continues with 'a' or 'b'.]
 (;W[qe]
 ;B[pg]LB[rg:A]C[White can tenuki here, because the corner is alive. Keima at 'a' is possible too.])
 (;W[qf]LB[qb:b][pg:a]C[Black continues with 'a' or 'b'.
 Another option is a top side extension.]
 (;B[pg]
 ;W[qg]
 ;B[ph]
 ;W[qh]
 ;B[pi])
 (;B[qb]
 ;W[rb]
 ;B[qd]
 ;W[pc]
 ;B[pd]
 ;W[rd]
 ;B[pb]
 ;W[rc]
 ;B[pg])
 (;B[jc])))
 (;B[pc]
 ;W[pb]
 ;B[qd]
 ;W[oc]
 ;B[pd]
 ;W[rb]
 ;B[rc]
 ;W[qb]
 ;B[nc]
 ;W[ob]
 ;B[nd]C[Joseki]))
 (;W[qd]LB[pc:b][qe:a][qf:c]C[
 -4 = Komoku
 ----------
 Black continues with 'a', 'b' or 'c'.
+]
 (;B[qe]LB[pe:b][re:a]C[White continues with 'a'. White 'b' gives Black great thickness to the top, though White gets good territory.]
 (;W[re]LB[pe:a][rf:b]C[Black continues with 'a'. Black 'b' is not recommended.]
 (;B[pe]LB[qf:b][rf:a]C[White continues with 'a'. White 'b' is not recommended.]
 (;W[rf]
 ;B[oc]
 ;W[pc]
 ;B[ob])
 (;W[qf]LB[rd:b][rf:a]C[Black continues with 'a'. Black 'b' is a mistake.]
 (;B[rf]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[qc])
 (;B[rd]C[Black 7 is a mistake.]
 ;W[rc]
 ;B[rf]
 ;W[sd]
 ;B[qg]
 ;W[oc])))
 (;B[rf]C[Black 5 is not recommended.]
 ;W[pe]
 ;B[qf]
 ;W[pd]
 ;B[pf]
 ;W[od]
 ;B[ne]
 ;W[nd]
 ;B[me]
 ;W[lc]))
 (;W[pe]C[White 4 gives Black great thickness towards the top, while White gets solid territory at right.]
 ;B[pd]
 ;W[pf]
 ;B[qc]
 ;W[rd]
 ;B[od]
 ;W[rc]
 ;B[og]LB[of:b][pg:a]C[White continues with 'a'. White 'b' is a mistake.]
 (;W[pg]
 ;B[ph]
 ;W[qh]
 ;B[of]
 ;W[pi]
 ;B[oh]
 ;W[qg])
 (;W[of]C[White's attempt to make cutting points in Black's shape does not work well, and Black gets better access to the right than in the alternate variation.]
 ;B[nf]
 ;W[qf]
 ;B[ng])))
 (;B[pc]LB[qc:A][qg:B]C['a' or 'b'.]
 (;W[qc]LB[pf:A][qf:B]C['a' or 'b'.]
 (;B[pf]LB[pd:a][rf:b]C[White continues with 'a' or 'b'.]
 (;W[pd]
 ;B[od]LB[ob:b][oc:a]C[White continues with 'a' or 'b'.]
 (;W[oc]
 ;B[nc]
 ;W[pb]
 ;B[ob]
 ;W[rf])
 (;W[ob]
 ;B[oc]
 ;W[pb]
 ;B[nb]
 ;W[rf]
 ;B[mc]
 ;W[qg]))
 (;W[rf]
 ;B[pb]
 ;W[qg]
 ;B[kc]))
 (;B[qf]LB[pb:B][oc:A]C['a' or 'b'.]
 (;W[oc]
 ;B[nc]
 ;W[ob]LB[nb:A][od:B]C['a' or 'b'.]
 (;B[nb]
 ;W[od]
 ;B[nd]
 ;W[ne]
 ;B[pe]LB[pd:C][me:B][nf:A]C['a' is correct, 'b' and 'c' are mistakes.]
 (;W[nf]
 ;B[kc]LB[qe:A][dp:B]C['a' is necessary, tenuki 'b' is a mistake.]
 (;W[qe]
 ;B[pg]
 ;W[ic]
 ;B[ke]
 ;W[nh]
 ;B[pj]
 ;W[kg]
 ;B[jf]
 ;W[ih])
 (;W[dp]
 ;B[og]
 ;W[lf]
 ;B[pd]
 ;W[pb]
 ;B[oa]
 ;W[re]
 ;B[pa]
 ;W[rf]
 ;B[rg]
 ;W[ra]
 ;B[qb]
 ;W[rb]
 ;B[sf]
 ;W[sc]))
 (;W[me]
 ;B[kc])
 (;W[pd]
 ;B[kc]
 ;W[nf]
 ;B[qi]))
 (;B[od]
 ;W[nb]
 ;B[mc]
 ;W[mb]
 ;B[lc]))
 (;W[pb])))
 (;W[qg]
 ;B[qc]
 ;W[qj]))
 (;B[qf]
 ;W[oc]LB[md:A][qi:B]C['a' or 'b'.]
 (;B[md]
 ;B[od]LB[nc:A][pc:B]C[Later, 'b' can increase his thickness here.
 'a' is correct. 'b' is submissive.]
 (;W[nc]
 ;B[pc]
 ;W[qc]LB[pb:A][pd:B]C['a' and 'b' are good.]
 (;B[pb]
 ;W[pd]
 ;B[mc]
 ;W[qb])
 (;B[pd]
 ;W[pb]
 ;B[ob]
 ;W[qb]
 ;B[nb]
 ;W[mc]
 ;B[lc]
 ;W[mb]
 ;B[lb]
 ;W[oa]
 ;B[ld]))
 (;W[pc]
 ;B[nc]C[Later.]))
 (;B[qi]
 ;W[mc]
 ;B[pc]
 ;W[pd]
 ;B[od]
 ;W[ob]
 ;B[rc]
 ;W[rd]
 ;B[qc]
 ;W[pb]
 ;B[se]
 ;W[sd]
 ;B[re]
 ;W[rb]
 ;B[pe]
 ;W[qb])))
 (;W[qe]LB[oc:a][pc:d][qd:b][qf:c]C[
 -3 = Mokuhazushi
 ---------------
 Black continues with 'a' to 'd'.
+]
 (;B[oc]LB[qc:b][qh:a]C[White continues with 'a' or 'b'.]
 (;W[qh]
 ;B[qc])
 (;W[qc]
 ;B[pg]
 ;W[rg]
 ;B[jd]))
 (;B[qd]LB[pd:b][rd:a]C[White continues with 'a' to settle on the right, or 'b' to start a fight.]
 (;W[rd]
 ;B[pd]LB[qc:b][rc:c][rf:d][qg:a]C[White continues with 'a', 'b' or 'c'.
 White 'a' emphasizes the right side. With 'b', White settles his stones in sente.
 'd' is a mistake.]
 (;W[qg]
 ;B[rc]
 ;W[qj])
 (;W[qc]C[White 6 is played if White wants sente.]
 ;B[pc]
 ;W[rb]
 ;B[qb]
 ;W[rc]
 ;B[qf]
 ;W[re]
 ;B[pf])
 (;W[rc]
 ;B[qf]LB[re:A][rf:B]C['a' is correct. 'b' is a mistake.]
 (;W[re]
 ;B[og]
 ;W[pb])
 (;W[rf]
 ;B[pe]
 ;W[re]
 ;B[qg]))
 (;W[rf]
 ;B[rc]
 ;W[sc]
 ;B[sb]
 ;W[sd]
 ;B[rb]
 ;W[pg]))
 (;W[pd]C[As always, White 4 is a fighting move.]
 ;B[pe]
 ;W[qc]
 ;B[rd]
 ;W[qf]
 ;B[pc]
 ;W[od]
 ;B[qb]
 ;W[oc]
 ;B[pb]
 ;W[md]
 ;B[ne]
 ;W[ld]
 ;B[pi]
 ;W[qh]
 ;B[og]
 ;W[qi]
 ;B[pj]
 ;W[qk]
 ;B[id]))
 (;B[qf]C[Black 3 emphasizes the right side, though White has the choice
 of that.]
 ;W[rf]
 ;B[pf]LB[qc:c][pd:a][qg:b]C[White continues with 'a'. White 'b' is not recommended. White 'c' is very loose.]
 (;W[pd]
 ;B[rg]
 ;W[od]
 ;B[re]
 ;W[rd]
 ;B[sf]
 ;W[md])
 (;W[qg]C[White 6 is not recommended.]
 ;B[rg]
 ;W[rh]
 ;B[re]
 ;W[sg]
 ;B[qd]
 ;W[pg]
 ;B[jd])
 (;W[qc]C[White 6 is a loose way of playing.]
 ;B[rg]
 ;W[nc]
 ;B[rd]))
 (;B[pc]LB[qc:A][pd:B]C['a' is better than 'b'.]
 (;W[qc]
 ;B[qf]
 ;W[rf]
 ;B[pf]
 ;W[rd]LB[pb:B][hd:A]C['a' is correct. 'b' is a mistake.]
 (;B[hd]LB[pb:A][oc:B]C['a' is better than 'b'.]
 (;W[pb]LB[ob:A][oc:B]C['a' is better than 'b'.]
 (;B[ob]LB[oc:B][pd:A]C['a' or 'b'.]
 (;W[pd]
 ;B[od]
 ;W[oc]
 ;B[nc])
 (;W[oc]
 ;B[nc]LB[od:A][pd:B]C['a' or 'b'.]
 (;W[od]
 ;B[nd]
 ;W[pd]
 ;B[ne])
 (;W[pd]
 ;B[od])))
 (;B[oc]
 ;W[ob]
 ;B[nc]))
 (;W[oc]LB[pb:B][pd:A]C['a' is correct. 'b' is a mistake.]
 (;B[pd]
 ;W[pb]
 ;B[nb]
 ;W[ob]
 ;B[nc]
 ;W[od]
 ;B[nd]
 ;W[pe]
 ;B[of])
 (;B[pb]
 ;W[pd]
 ;B[od]
 ;W[ob])))
 (;B[pb]
 ;W[kd]
 ;B[rg]
 ;W[pd]
 ;B[od]
 ;W[qb]
 ;B[nc]
 ;W[sg]
 ;B[rh]
 ;W[hd]))
 (;W[pd]
 ;B[od]
 ;W[qc]
 ;B[ob]
 ;W[qb]
 ;B[qf]
 ;W[rf]
 ;B[pf]
 ;W[rg]
 ;B[jd])))
 (;W[qf]C[
 -3 = Oomokuhazushi
 ------------------
 White forsakes the corner for the right.
+]
 ;B[qd]LB[nc:b][oc:c][qi:a]C[White continues with 'a' or 'b'. White 'c' is not recommended.]
 (;W[qi]
 ;B[nc])
 (;W[nc]
 ;B[pc])
 (;W[oc]C[White 4 is not recommended. White cannot have it both ways.]
 ;B[od]
 ;W[pc]CR[nc]C[Here is the real overplay, but going the other way (the marked location) makes little sense.]
 ;B[qe]
 ;W[lc]
 ;B[qc]
 ;W[pg]
 ;B[ob]
 ;W[pb]
 ;B[nc]
 ;W[nb]
 ;B[mb]
 ;W[oa]
 ;B[mc]
 ;W[qb]
 ;B[rb]
 ;W[qa]LB[jc:b][ld:a]C[Locally, Black may next address White 8. Depending upon circumstances,
 'a' and 'b' are possibilities.]))
 (;W[pd]C[Not the best way of invading 5-5
 -4 = Hoshi
 -------
+]
 ;B[pe]LB[oc:c][qd:a][qe:b]C[White continues with 'a' to 'c'.]
 (;W[qd]
 ;B[qe]LB[nc:b][od:a]C[White continues with 'a' or 'b'.]
 (;W[od]
 ;B[nd]
 ;W[nc]
 ;B[mc]
 ;W[nb]
 ;B[mb]
 ;W[pb]
 ;B[md])
 (;W[nc]
 ;B[oc]C[Painful for White]
 ;W[od]
 ;B[nd]LB[ob:a][md:b]C[White continues with 'a' or 'b'.]
 (;W[ob]
 ;B[mc]
 ;W[nb]
 ;B[md]LB[rc:B][rd:A][re:C]C[A-B-C yose is painful later, so the result is better for Black.])
 (;W[md]
 ;B[ne]
 ;W[mc]
 ;B[rd]
 ;W[pb]
 ;B[qb]
 ;W[pc]
 ;B[qc]
 ;W[ob])))
 (;W[qe]
 ;B[qf]
 ;W[qd]
 ;B[od]
 ;W[rf]
 ;B[qg]
 ;W[rg]
 ;B[qh]
 ;W[ob]
 ;B[oc]
 ;W[pb]
 ;B[mc])
 (;W[oc]LB[qd:b][qe:a]C[Black continues with 'a' or 'b'.]
 (;B[qe]
 ;W[mc]
 ;B[qc]
 ;W[jc])
 (;B[qd]
 ;W[qc]
 ;B[qe]
 ;W[rc]
 ;B[nc]
 ;W[nb]
 ;B[od]
 ;W[pc]
 ;B[mc]
 ;W[mb]
 ;B[lc]))))
 (;B[qj]LB[pg:G][oh:F][ni:E][oi:D][pi:A][oj:C][pj:H]C[
 Reductions against a stone on the third line on the side.
 ----------------------------------------------------------
 - shoulder hit on 'a'
 - shoulder hit against a niken-biraki on 'a'
 - boshi on 'c'
 - keima on 'c'
 - oogeima on 'e'
 - ear move against an ikken tobi on 'f'
 - attatchment at other stones on 'g' before a direct approach
 - tsuke on 'h'
 The choice of the reduction move depends on the type of Black moyo and the strategic plan of White.
+]
 (;AW[qp][oq]AB[kd][pd]
 ;W[pi]LB[qi:B][pj:A]C['a' is joseki, 'b' is too low.]
 (;B[pj]LB[ni:B][oi:A]C['a' or sabaki 'b'.]
 (;W[oi]LB[rh:A][qi:C][oj:B]C['a' is usual, 'b' and 'c' are also possible, 'b' gives both sides more strength.]
 (;B[rh]LB[li:C][mi:B][oj:A]C['a', 'b' or 'c'.]
 (;W[oj]LB[pg:A][qg:B][ok:C]C[
 * Joseki *
 Later, Black 'a' or 'c' or White 'b'.]
 (;B[pg])
 (;W[qg]
 ;B[qh]
 ;W[og])
 (;B[ok]
 ;W[nk]
 ;B[ol]LB[nj:A]C[Black aims at 'a'.]))
 (;W[mi])
 (;W[li]))
 (;B[oj]LB[mi:B][ni:A]C['a' is correct, 'b' is not recommended.]
 (;W[ni]LB[qh:F][rh:A][pi:2][qi:E][nj:C][mk:D][qn:B]C['a' is correct. 'b' is bad. 'c' makes more influence and is good if White 2 was a strategic mistake. 'd' is questionable. 'e' weakens the top side. 'f' is not recommended.]
 (;B[rh])
 (;B[qn]
 ;W[qi]C[White attacks both sides.])
 (;B[nj]
 ;W[mi])
 (;B[mk]
 ;W[li]
 ;B[kk]LB[qi:A]C[Later, White can play 'a'.])
 (;B[qi]LB[pg:A][qh:B]C['a' or 'b'.]
 (;W[pg]
 ;B[qn]LB[nd:A]C[White aims at 'a'.])
 (;W[qh]
 ;B[qn]))
 (;B[qh]C[Aji for White.]))
 (;W[mi]
 ;B[ni]
 ;W[nh]
 ;B[nj]LB[og:A][mh:B]C[Ater 'a' or 'b', White has a weak position.]
 (;W[og]
 ;B[nd])
 (;W[mh]
 ;B[pg])))
 (;B[qi]LB[pg:A][qh:B]C['a' settles the position. 'b' starts a fight.]
 (;W[pg]
 ;B[qh]LB[nd:B][nf:A]C['a' or 'b'.]
 (;W[nf]
 ;B[nd])
 (;W[nd]))
 (;W[qh]
 ;B[ph]
 ;W[qg]
 ;B[oh])))
 (;W[ni]LB[ph:D][oi:A][qi:C][oj:B]C['a' is correct, 'b' is possible. 'c' is too heavy. 'd' is not recommended.]
 (;B[oi]
 ;W[oh]
 ;B[oj]LB[mg:D][ng:C][mh:B][nh:A]C['a', 'b', 'c' or 'd' are ok.]
 (;W[nh]LB[qg:A][mk:C][qn:B]C[
 * Joseki *
 Later Black 'a' to connect, 'b' for territory, 'c' for influence. White 'a', White 'c', or White invades the top side.]
 (;B[qg])
 (;B[qn])
 (;B[mk])
 (;W[qg])
 (;W[mk]))
 (;W[mh])
 (;W[ng])
 (;W[mg]))
 (;B[oj]LB[ng:A][oi:B]C['a' or 'b'.]
 (;W[ng]LB[oi:A]C[A Black push at 'a' is slow and may not be answered immediately.])
 (;W[oi]))
 (;B[qi]C[Tenuki is better than continuing.]
 ;W[ph]
 ;B[oj]C[Tenuki is better than continuing.]
 ;W[mg]
 ;B[nd])
 (;B[ph]LB[oh:A][qi:B]C['a' is correct. 'b' is bad.]
 (;W[oh]LB[qh:A][qi:B]C['a' is submissive. 'b' hurts the top side.]
 (;B[qh])
 (;B[qi]
 ;W[pg]
 ;B[oi]
 ;W[qh]
 ;B[nh]
 ;W[pi]
 ;B[oj]
 ;W[ng]
 ;B[mh]
 ;W[mg]
 ;B[lh]
 ;W[nd]))
 (;W[qi]
 ;B[oi]
 ;W[oh]
 ;B[oj]C[Nothing but aji for White.]))))
 (;B[qi]LB[pg:B][ph:A]C['a' or 'b'.]
 (;W[ph]LB[qg:A][qh:B][pj:C]C['a' connects, 'b' gives a bit territory for more valuable influence, 'c' hurts the top side.]
 (;B[qg])
 (;B[qh]
 ;W[pg]
 ;B[qg]
 ;W[pf]
 ;B[re])
 (;B[pj]
 ;W[ni]
 ;B[oj]LB[nd:A][nf:C][mg:B]C['a' is correct, 'b' and 'c' are too slow.]
 (;W[nd])
 (;W[mg]
 ;B[nd]LB[lj:A]C[Black aims at 'a'.])
 (;W[nf]
 ;B[nd]LB[lj:A]C[Black aims at 'a'.])))
 (;W[pg]LB[ph:A][qh:B][oi:C]C['a' or 'b' are possible. 'c' hurts the top side.]
 (;B[ph]
 ;W[oh]
 ;B[qh]
 ;W[og]LB[qf:A]C[Black can connect on 'a'.])
 (;B[qh]
 ;W[ng])
 (;B[oi]LB[oh:A][pj:B]C['a' to weaken the top side, 'b' to fight.]
 (;W[oh]
 ;B[pj]
 ;W[ni]
 ;B[ph]
 ;W[qh]
 ;B[nh]
 ;W[pi]
 ;B[oj]
 ;W[ng]
 ;B[mh]
 ;W[mg]
 ;B[lh]
 ;W[nd])
 (;W[pj]
 ;B[ph]
 ;W[oh]
 ;B[qh]
 ;W[ni]
 ;B[oj]
 ;W[pk])))))
 (;AW[qp][oq]AB[kc][od][qd][qm]
 ;W[pi]LB[ni:C][qi:A][nj:D][pj:B]TR[qm]C['a' and 'b' are joseki.
 'a' leaves continuations to attack White, 'b' takes more territory.
 'c' builds thickness in the center. 'd' attacks the White group and pushes it into the Black moyo.
 The shoulder hit is bad, if the triangled stone is on the squared position instead.]MA[qn]
 (;B[qi]LB[pg:B][ph:A]C['a' or 'b' are ok.]
 (;W[ph]LB[qh:B][pj:C][ok:A]C['a' is correct, 'b' and 'c' lead to overconcentration.]
 (;B[ok]LB[mh:B][mi:A]C['a' or 'b'.]
 (;W[mi]LB[mg:B][rg:C][ni:A]C[
 * Joseki *
 Immediately or later, Black attacks the White group on 'a' or 'b'. 'c' is too defensive, as Black is already settled.]
 (;B[ni]
 ;W[nh]
 ;B[nj]
 ;W[mg]
 ;B[lh]
 ;W[mh]
 ;B[og]
 ;W[oh]
 ;B[lk])
 (;B[mg]
 ;W[nj]
 ;B[ml])
 (;B[rg]))
 (;W[mh]LB[ni:A][mj:B]C[Black can attack on 'a' or 'b'.]
 (;B[ni]
 ;W[nh]
 ;B[og]
 ;W[oh]
 ;B[lj]C[Black doesn't want to give White time for an invasion on the top side.])
 (;B[mj])))
 (;B[qh]
 ;W[pg]
 ;B[qg]
 ;W[mh]TR[qj][qm]C[Overconcentration marked.])
 (;B[pj]
 ;W[ni]
 ;B[oj]LB[nf:B][mg:A][lh:C]C['a', 'b' or 'c'.]
 (;W[mg])
 (;W[nf])
 (;W[lh])))
 (;W[pg]LB[ph:A][ni:C][oi:B]C['a' is usual, 'b' leads to a big fight, 'c' is an attack, if Black is stronger.]
 (;B[ph]
 ;W[oh]
 ;B[qh]
 ;W[pc]
 ;B[pd]
 ;W[ng]
 ;B[of]
 ;W[og]
 ;B[nj])
 (;B[oi]
 ;W[oh]
 ;B[pj]
 ;W[ni]
 ;B[ph]
 ;W[qh]
 ;B[nh]
 ;W[pi]
 ;B[oj]
 ;W[ng]
 ;B[mh]
 ;W[mg]
 ;B[lh])
 (;AE[qm]AW[oo]AB[pl][qn]
 ;B[ni]LB[pi:2]C[White 2 was already bad.])))
 (;B[pj]LB[ni:B][oi:A]C['a' is correct, 'b' makes White heavy.]
 (;W[oi]LB[rh:A][qi:C][oj:B]C['a' and 'b' are ok, 'c' is not recommended.]
 (;B[rh]LB[mi:B][pi:2][oj:A]TR[qm]C['a' is correct, 'b' is too easy for Black.
 Black would also play this variation, if the triangled stone was on the squared position instead, showing and using the mistake of White 2.]MA[qn]
 (;W[oj]LB[ok:B][om:A]C['a' is correct, 'b' unnecessarily helps White.]
 (;B[om]C[
 * Joseki *]
 ;W[qg]C[Continuation for White.]
 ;B[qh]
 ;W[og])
 (;B[ok]
 ;W[nk]))
 (;W[mi]))
 (;B[oj]
 ;W[ni]
 ;B[rh]LB[li:A][nj:B]C['a' is correct, 'b' is not recommended.]
 (;W[li])
 (;W[nj]
 ;B[nk]
 ;W[mk]
 ;B[mj]C[Depends on the ladder]
 ;W[lj]))
 (;B[qi]
 ;W[pg]LB[qh:B][nk:A]C['a' is better than 'b'.]
 (;B[nk]
 ;W[lh]LB[qh:A]C[White later plays 'a'.])
 (;B[qh]
 ;W[mg]C[Black overconcentrated.])))
 (;W[ni]LB[ph:B][oi:A]C['a' or 'b' punish White.]
 (;B[oi]
 ;W[oh]
 ;B[oj]
 ;W[nh]
 ;B[qg])
 (;B[ph])))
 (;B[ni]
 ;W[pj]
 ;B[qk]
 ;W[nj]
 ;B[mj]
 ;W[nk])
 (;B[nj]
 ;W[pj]
 ;B[qk]
 ;W[ni]
 ;B[mi]
 ;W[nh]))
 (;AB[pd][pp]
 ;W[oj]LB[qg:E][ph:A][qh:D][ni:H][oi:B][pi:F][mj:G][pj:C]C['a', 'b' and 'c' are joseki.
 If 'a', choose the side which gives more territory and follow-ups into the center and where your opponent would like to play.
 After 'b' White develops strength in the center.
 'c' makes territory and leaves Black the choice of direction but no aji or tricks.
 'c' is less preferable than 'a' and 'b'.
 'd' is extremly secure and anxious.
 'e' lets White have a simple attack.
 'f' is bad shape.
 'g' is possible if Black is very strong all around.
 'h' emphasizes the center not caring for the side.]
 (;B[ph]LB[nh:E][oh:D][lj:F][qk:C][ol:A][pl:B][dp:G]C[
 * Joseki *
 'a' can be good, if Black is safe on both sides. 'b' depends on the ladder.
 'c' is joseki to destroy Black territory.
 'd' is a special strategy if the center is most important.
 If the upper corner is secured by a shimari, 'd' is correct.
 'e' is too soft.
 'f' can be good as part of a center moyo.
 'g' shows follow-ups for Black.
+]
 (;W[ol]
 ;B[ql]
 ;W[lk])
 (;W[pl]
 ;B[ok]C[If White made a mistake and Black has the ladder, Black can cut.])
 (;W[qk]LB[ni:E][qi:D][pj:C][pk:B][qk:4][rk:A]C['a' is joseki.
 'b' is especially good with the ladder.
 'c' helps White making territory.
 'd' takes sente without fighting.
 If White 4 was wrong because the center is more important than the side, Black punishes on 'e'.]
 (;B[rk]LB[rj:A][pk:B][ql:C]C['a' is joseki.
 After 'b' White is heavy, after 'c' White has unsuccessful shape.]
 (;W[rj]LB[qi:D][ri:A][pj:C][pk:E][ql:B]C[Sacrifice for sente moves which settle White.
 'a' is joseki, 'b' depends on the ladder.
 'c' makes a fight, which is not bad for Black, possible. 'd' is possible.
  'e' invites a territorial loss.]
 (;B[ri]LB[qi:B][pj:A]C['a' is joseki, 'b' is a trick play.]
 (;W[pj]LB[qi:A][sj:B]C['a' is joseki, 'b' is a ko variation, if Black doesn't want to White another sente move.]
 (;B[qi]
 ;W[rl]
 ;B[sj]LB[pl:A][ql:B][qm:C]C['a', 'b' or 'c' are good.]
 (;W[pl]C[
 * Joseki *])
 (;W[ql])
 (;W[qm]))
 (;B[sj]
 ;W[qi]LB[qh:A][rj:C][ql:B]C['a' and 'b' start the ko. 'c' is gote.]
 (;B[qh])
 (;B[ql])
 (;B[rj]
 ;W[ql]
 ;B[pi]C[Necessary to eliminate bad aji.])))
 (;W[qi]LB[pj:A][sj:B]C['a' is correct, 'b' is getting tricked.]
 (;B[pj]
 ;W[pi]LB[sj:B][pk:A]C['a' takes territory for influence, 'b' starts a fight.]
 (;B[pk]
 ;W[qh]
 ;B[rh]
 ;W[ok]
 ;B[pl]
 ;W[oh])
 (;B[sj]
 ;W[pk]
 ;B[rj]
 ;W[qh]
 ;B[ok]))
 (;B[sj]
 ;W[pj])))
 (;B[ql]LB[qi:B][pk:A]C['a' if the ladder is White, 'b' if the ladder is Black.]
 (;W[pk]
 ;B[ri]
 ;W[rl]
 ;B[sj]
 ;W[qm])
 (;W[qi]
 ;B[pk]
 ;W[pj]
 ;B[qk]
 ;W[pi]
 ;B[oh]))
 (;B[pj]LB[ri:C][pk:B][rl:A]C['a' settles White, 'b' and 'c' start the fight.]
 (;W[rl]
 ;B[pk]
 ;W[ql]
 ;B[ri])
 (;W[pk]
 ;B[rl])
 (;W[ri]
 ;B[rl]))
 (;B[qi]LB[ql:B][rl:A]C['a' or 'b'.]
 (;W[rl]
 ;B[pk]
 ;W[ql]
 ;B[ok])
 (;W[ql]))
 (;B[pk]LB[qi:C][pj:B][ql:A]C['a' or 'b' are ok, 'c' is bad.]
 (;W[ql]
 ;B[pj]
 ;W[ri])
 (;W[pj]LB[qi:B][ql:A]C['a' is correct, 'b' helps White.]
 (;B[ql]
 ;W[qi])
 (;B[qi]
 ;W[ql]))
 (;W[qi]
 ;B[pj])))
 (;W[pk]
 ;B[rl])
 (;W[ql]
 ;B[pj]
 ;W[ok]
 ;B[rl]))
 (;B[pk]
 ;W[pj]LB[qi:A][ql:B]C['a' with the ladder, 'b' if the ladder is White.]
 (;B[qi]
 ;W[ql]
 ;B[ok])
 (;B[ql]LB[qi:B][rk:A]C[White makes a position with 'a' on the lower, with 'b' on the upper side.]
 (;W[rk]
 ;B[qi]
 ;W[pl]
 ;B[ok]
 ;W[qm])
 (;W[qi])))
 (;B[pj]
 ;W[pk]
 ;B[ok]LB[rj:A][pm:B]C['a' is correct. 'b' is a mistake.]
 (;W[rj]
 ;B[ri])
 (;W[pm]
 ;B[nk]
 ;W[oi]
 ;B[pg]))
 (;B[qi]LB[pk:B][ol:A]C['a' is light, 'b' is thick.]
 (;W[ol])
 (;W[pk]))
 (;B[ni]))
 (;W[oh]LB[og:A][pg:B]C['a' makes the top right corner big, 'b' avoids strenghening White.]
 (;B[og]LB[nh:A][pi:B]C['a' or 'b'.]
 (;W[nh]LB[ng:A][pg:C][pi:B]C['a' and 'b' are correct, 'c' unnecessarily is gote.]
 (;B[ng]LB[mg:A][mh:B]C['a' is correct. 'b' is a mistake.]
 (;W[mg]LB[pg:A][mh:B]C['a' is correct, 'b' is an overplay.]
 (;B[pg]
 ;W[lh]LB[qk:A]C[White 'a' has become attractive.])
 (;B[mh]
 ;W[pi]))
 (;W[mh]
 ;B[mg]C[Black makes territory on the 7th line.]))
 (;B[pi]LB[ng:C][mk:A][nl:B]C['a', 'b' or 'c'.]
 (;W[mk])
 (;W[nl])
 (;W[ng]
 ;B[of]LB[mk:A][nl:B]C['a' or 'b'.]
 (;W[mk])
 (;W[nl])))
 (;B[pg]))
 (;W[pi]
 ;B[qi]
 ;W[pg]
 ;B[qh]
 ;W[nh]
 ;B[ng]
 ;W[mg]
 ;B[pf]
 ;W[lh]LB[qk:A]C[White 'a' has become impossible.]))
 (;B[pg]LB[li:A][qk:B]C[White goes to the center onto or near 'a'. He aims at 'b' later.
 Playing 'b' now is too early.]
 (;W[li])
 (;W[qk]LB[pj:A][pk:B][rk:C]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[pj]
 ;W[pk]
 ;B[ok])
 (;B[pk]
 ;W[pj]
 ;B[ql]
 ;W[qi]
 ;B[rk]
 ;W[rj]LB[ri:B][qk:A]C['a' or 'b'.]
 (;B[qk]
 ;W[pi])
 (;B[ri]))
 (;B[rk]
 ;W[rj]
 ;B[ri]LB[qi:B][pj:A]C['a' or 'b'.]
 (;W[pj]LB[qi:B][sj:A]C['a' is correct, 'b' is bad.]
 (;B[sj]
 ;W[qi]
 ;B[rj]
 ;W[ql])
 (;B[qi]
 ;W[rl]))
 (;W[qi]
 ;B[sj]
 ;W[pj]
 ;B[rj]
 ;W[ql])))))
 (;AE[pd]AB[od][qd]
 ;W[oh]
 ;B[pg]
 ;W[qk]
 ;B[rk]
 ;W[rj]
 ;B[ri]
 ;W[pj]LB[qi:B][sj:A]TR[pg][oh]C[After the triangled exchange, 'a' is correct, 'b' wrong.
+]
 (;B[sj]
 ;W[qi]
 ;B[rj]
 ;W[ql])
 (;B[qi]
 ;W[rl]
 ;B[sj]
 ;W[om]))
 (;W[nh]LB[ni:A]C[Black threatens 'a'.])
 (;W[lj])
 (;W[dp]LB[ni:A][ok:B]C['a' or 'b'.]
 (;B[ni])
 (;B[ok])))
 (;B[oi]LB[ni:A][pi:C][pj:B]C['a' is joseki to develop the center.
 'b' is a variation to prevent Black territroy.
 C is a possibility after some invasions in the upper right corner.]
 (;W[ni]LB[oh:B][pi:A]C['a' is joseki, 'b' is sometimes possible.]
 (;B[pi]LB[nh:C][mj:B][nj:A]C['a' is the usual joseki, 'b' emphasizes the center.
 'c' starts a fight which can be possible.]
 (;W[nj]LB[nh:A][pk:B][pl:C][ql:D][dp:E]C[
 * Joseki *
 Black makes territory on the upper side with 'a' or on the lower side with 'b', 'c' or 'd'.
 'e' shows White's follow-ups.]
 (;B[nh]
 ;W[mh]LB[mg:B][ng:A]C['a' is usual. 'b' takes sente for influence.]
 (;B[ng]LB[mg:A][qk:B]C['a' or 'b'.]
 (;W[mg]
 ;B[nf]CR[mf]LB[nf:11][mg:10]C[If Black 11 is better on the circled position, White does not play 10.])
 (;W[qk]
 ;B[rk]
 ;W[ql]))
 (;B[mg]
 ;W[ng]
 ;B[oh]
 ;W[lh]
 ;B[lg]
 ;W[kg]
 ;B[nf]
 ;W[kh]))
 (;B[pk]
 ;W[ng])
 (;B[pl]
 ;W[ng])
 (;B[ql]
 ;W[ng])
 (;B[dp]LB[ng:A][qk:B]
 (;W[ng])
 (;W[qk])))
 (;W[mj]LB[nh:A][ok:B]
 (;B[nh]
 ;W[mh]
 ;B[mg]
 ;W[ng]
 ;B[oh]
 ;W[lh]
 ;B[lg]
 ;W[kg]
 ;B[nf]
 ;W[kf]LB[qk:A]C[White 'a' has become less dangerous.])
 (;B[ok]
 ;W[pk]C[Later.]
 ;B[pj]
 ;W[ol]))
 (;W[nh]LB[og:B][nj:A]C['a' is correct, 'b' is submissive.]
 (;B[nj])
 (;B[og]
 ;W[nl])))
 (;B[oh]
 ;W[pj]
 ;B[qi]LB[qk:A][pl:B]C['a' leads to a necessary fight, 'b' is too nild.]
 (;W[qk]LB[qg:B][oh:5][nj:A][rk:C]C['a' is necessary. The following fight will prove the value of Black 5.
 Avoiding the fight with 'b' or 'c' is too fearful.]
 (;B[nj]LB[pi:A][pl:B]C['a' or 'b'.]
 (;W[pi]
 ;B[ph]
 ;W[qh]
 ;B[rk]
 ;W[ql]
 ;B[rh]
 ;W[qg]
 ;B[rl]
 ;W[qm]
 ;B[mi])
 (;W[pl]
 ;B[pi]
 ;W[mi]
 ;B[nk]
 ;W[ol]))
 (;B[qg]
 ;W[nj])
 (;B[rk]
 ;W[ql]
 ;B[rl]
 ;W[qm]
 ;B[nj]
 ;W[mi]LB[pi:A]C[White aji at 'a'.]))
 (;W[pl]
 ;B[qk]
 ;W[nl])))
 (;W[pj]
 ;B[pi]
 ;W[qk]LB[qi:A][ri:D][nj:C][pk:B]C['a' is correct. 'b' is an overplay. 'c' is not recommended.
 'd' is inferior.]
 (;B[qi]LB[nj:A][pl:B]C['a' is correct, after 'b' White gets heavy.]
 (;W[nj])
 (;W[pl]
 ;B[nj]))
 (;B[pk]LB[pl:A][ql:B]C['a' or 'b'. White settles, no dependency on a ladder.]
 (;W[pl]
 ;B[ok]
 ;W[nj])
 (;W[ql]))
 (;B[nj]LB[qi:A][rj:B]C['a' leads to a fight, 'b' avoids it.]
 (;W[qi]
 ;B[rj]
 ;W[rk]
 ;B[ri]
 ;W[qh]
 ;B[rh]
 ;W[ni])
 (;W[rj]
 ;B[qi]
 ;W[pl]))
 (;B[ri]
 ;W[rj]
 ;B[qi]
 ;W[nj])))
 (;B[pj]LB[oh:B][oi:A]C['a' is correct, 'b' is not recommended.]
 (;W[oi]LB[ph:B][ok:A]C['a' is correct. 'b' makes less territory and gives White more influence.]
 (;B[ok]
 ;W[nk]LB[nj:C][nl:B][ol:A]C['a' is usual. 'b' is possible. 'c' leads to a disadvantageous fight.]
 (;B[ol]LB[pg:B][ph:A][mj:D][nl:C]C[
 * Joseki *
 White follow-ups are 'a' to 'd'.]
 (;W[ph])
 (;W[pg])
 (;W[nl])
 (;W[mj]))
 (;B[nl]
 ;W[ol]
 ;B[pk]LB[mk:A][om:B]C['a' is usual, 'b' starts a fight.]
 (;W[mk])
 (;W[om]))
 (;B[nj]
 ;W[pi]
 ;B[qi]
 ;W[pg]
 ;B[qh]
 ;W[ol]
 ;B[pk]
 ;W[ng]))
 (;B[ph]LB[ok:B][ol:A]TR[pn]C['a' is correct.
 'b' is correct, if there is an additional Black stone on the triangled position.]
 (;W[ol])
 (;AB[pn]
 ;W[ok])))
 (;W[oh]LB[qh:B][ok:A]C['a' is correct, 'b' misses the chance of punishing White.]
 (;B[ok]
 ;W[nj]
 ;B[nk]C[White heavy.])
 (;B[qh]
 ;W[ok])))
 (;B[qh]LB[qk:A]C[White 'a' is no more a big threat.]
 ;W[qk]
 ;B[pk]
 ;W[pj]
 ;B[ql]LB[qi:A][rk:B]C['a' splits Black who secures territory on both sides.
 'b' needs the ladder.]
 (;W[qi]
 ;B[rk]
 ;W[rj]
 ;B[qk]
 ;W[pi]
 ;B[rh]
 ;W[ri]
 ;B[ph])
 (;W[rk]
 ;B[rj]
 ;W[rl]LB[pl:B][qm:A]C['a' if the ladder is Black. 'b' if the ladder is White.]
 (;B[qm]
 ;W[pl]
 ;B[ok]
 ;W[pm])
 (;B[pl]C[Fight in Black's favor.])))
 (;B[qg]
 ;W[qk]LB[pk:A][rk:B]C['a' is being split, 'b' is being pressed down low.]
 (;B[pk]
 ;W[pj]
 ;B[ql]
 ;W[qi]
 ;B[rk]
 ;W[rj]
 ;B[qk]
 ;W[qh]
 ;B[pg]
 ;W[oh])
 (;B[rk]LB[rj:B][pk:A]C['a' or 'b'.]
 (;W[pk]
 ;B[rl]
 ;W[qi]
 ;B[ri]
 ;W[pj]
 ;B[rj])
 (;W[rj]
 ;B[ri]
 ;W[pj])))
 (;B[pi]
 ;W[oi]LB[oh:A][ph:B]C['a' bad shape, 'b' is slow.]
 (;B[oh]
 ;W[nh]
 ;B[og]
 ;W[qk]
 ;B[rk])
 (;B[ph]
 ;W[pl]))
 (;B[mj])
 (;B[ni]
 ;W[oi]
 ;B[oh]))
 (;AW[qp][oq]AB[kd][pd]
 ;W[oi]LB[ph:D][pi:F][oj:E][pk:A][qm:B][qo:C]C['a' prevents White pressing down on the lower side, White presses on the upper side.
 'b' has the same idea as 'a', but an a whole board thinking.
 'c' is a good preparation before playing 'a'.
 'd' is the contrary of 'a', prevents White pressing down on the upper side.
 'e' starts fighting, Black needs both ladders.
 'f' is a good variation.]
 (;B[pk]LB[qi:A][nk:B][ok:C]TR[qn][qo]C[Before continuing the joseki, Black likes to make an extension onto one of the triangled stones.
 'a' presses down. 'b' defends the center, needs the ladder.
 'c' doesn't need the ladder, but doesn't close off the center.]
 (;W[qi]
 ;B[ri]
 ;W[qh]
 ;B[rh]LB[qf:A][nj:B][ok:C]C['a' cuts the side.
 'b' emphasizes the center, 'c' leaves too many cuts.]
 (;W[qf]LB[qe:B][nj:A]C[
 * Joseki *
 Black aims at 'a' or defends on 'b'.])
 (;W[nj]LB[qg:A][nk:B]C['a' for territory or 'b' for attack.]
 (;B[qg]
 ;W[ol])
 (;B[nk]))
 (;W[ok]LB[oj:A][ol:B]C['a' is correct, 'b' is not recommended.]
 (;B[oj]
 ;W[nj]
 ;B[pj])
 (;B[ol]
 ;W[nk])))
 (;W[nk]LB[ph:A][nj:B]C['a' with a White ladder, 'b' with a Black ladder.]
 (;B[ph])
 (;B[nj]))
 (;W[ok]
 ;B[ol]
 ;W[nk]LB[nl:B][pm:A]C['a' or, if White can't block, 'b'.]
 (;B[pm])
 (;B[nl]LB[lk:A][ml:B][nl:7]C['a' if Black 7 was correct, 'b' if it wasn't.]
 (;W[lk]
 ;B[ml]
 ;W[li])
 (;W[ml]LB[mk:B][ml:8][nl:7][pm:A]C['a' after Black 7 was wrong, 'b' if White 8 was an overplay.]
 (;B[pm]
 ;W[lk])
 (;B[mk]
 ;W[mi]
 ;B[lk]
 ;W[pl]
 ;B[pm]
 ;W[ql]
 ;B[qm]
 ;W[rk])))))
 (;B[qm]
 ;W[ph]
 ;B[nd])
 (;B[qo]
 ;W[po]
 ;B[qn]
 ;W[rp]
 ;B[pn]
 ;W[oo]LB[oj:B][pk:A]C['a' or 'b'.]
 (;B[pk])
 (;B[oj]
 ;W[pj]
 ;B[pi]
 ;W[pk]
 ;B[qk]
 ;W[ql]
 ;B[pl]
 ;W[ok]
 ;B[ol]
 ;W[nk]
 ;B[rl]
 ;W[ph]
 ;B[qi]
 ;W[nh]
 ;B[nl]
 ;W[mk]))
 (;B[ph]
 ;W[qc]
 ;B[qd]
 ;W[pc]
 ;B[oc]
 ;W[ob]LB[nb:A][nc:B]C['a' is better than 'b'.]
 (;B[nb]
 ;W[nc]
 ;B[od]
 ;W[mb]
 ;B[nd]
 ;W[na]
 ;B[mc])
 (;B[nc]
 ;W[nb]
 ;B[mc]
 ;W[rd]
 ;B[re]
 ;W[rc]
 ;B[qf]
 ;W[pk]))
 (;B[oj]LB[pi:C][nj:A][pj:B]C['a' if White has the ladder to the top, 'b' if White has the ladder to the bottom, 'c' without any ladder.]
 (;W[nj]LB[ni:A][ok:B]C['a' depends on the ladder, 'b' gives White a good development.]
 (;B[ni]
 ;W[pj]
 ;B[ok]LB[oh:B][pi:A]C['a' with a Black ladder, 'b' with a White ladder.]
 (;W[pi]
 ;B[pk]
 ;W[qi]
 ;B[qk])
 (;W[oh]
 ;B[pk]
 ;W[mi]))
 (;B[ok]LB[pi:A][qi:B]C['a' or 'b' are ok.]
 (;W[pi]
 ;B[qi]
 ;W[qh])
 (;W[qi]
 ;B[ni]
 ;W[oh]
 ;B[rj]
 ;W[ne]C[White sabaki.])))
 (;W[pj]LB[pi:B][pk:A]C['a' with a White ladder, 'b' is a Black ladder.]
 (;B[pk]
 ;W[pi]
 ;B[qk]
 ;W[mi])
 (;B[pi]
 ;W[pk]
 ;B[qi]
 ;W[nj]))
 (;W[pi]LB[qi:B][pj:A]C['a' is correct, 'b' leaves too many cuts.]
 (;B[pj]
 ;W[ni]
 ;B[rh])
 (;B[qi]
 ;W[pj]
 ;B[pk]
 ;W[qh])))
 (;B[pi]LB[oh:B][oj:A]C['a' or 'b' are possible.]
 (;W[oj]
 ;B[oh]
 ;W[nh]
 ;B[ql])
 (;W[oh]
 ;B[oj]
 ;W[nj]
 ;B[ni]C[This move depends on the ladder.])))
 (;AW[qp][oq]AB[kd][pd]
 ;W[ni]LB[pf:D][ph:B][pi:C][oj:A][qm:E]C['a' is correct, 'b' is questionable. 'c' is possible. 'd' or 'e' are possible.]
 (;B[oj]LB[ph:B][nj:A]C['a' to make a position in the center, 'b' to cut deeper into the Black position.]
 (;W[nj]LB[oi:B][ok:A]C['a' is correct, 'b' helps White to build influence.]
 (;B[ok]LB[nk:B][ml:A]C['a' is correct, 'b' is questionable.]
 (;W[ml]C[
 * Joseki *]
 ;B[nd])
 (;W[nk]
 ;B[nl]))
 (;B[oi]LB[nh:B][nk:A]C['a' or 'b'.]
 (;W[nk]
 ;B[nh]
 ;W[qc])
 (;W[nh]
 ;B[nk])))
 (;W[ph]LB[oi:A][nj:B]C['a' starts a fight, 'b' is possible.]
 (;B[oi]
 ;W[oh]
 ;B[nh])
 (;B[nj]
 ;W[mi]
 ;B[mj]
 ;W[li]
 ;B[kk])))
 (;B[ph]C[White is light and can invade the Black corner.])
 (;B[pi]LB[nk:A]C[White can invade the Black corner, Black aims at 'a'.])
 (;B[pf]
 ;W[pi]
 ;B[qi]
 ;W[pj]
 ;B[qk]
 ;W[mg]LB[qh:A]C[White aims at 'a'.])
 (;B[qm]))
 (;AW[ql][op][qp][kq]AB[oc][jd][qd][oj]
 ;W[oh]LB[qh:A][mj:B]C['a' makes territory, 'b' attacks.]
 (;B[qh]
 ;W[oe])
 (;B[mj]
 ;W[qh]))
 (;AW[nc][kd][qm][pp]AB[pd][pf]
 ;W[pg]LB[of:A][qf:C][og:B][qg:D][oj:E]C['a' is a simple attack.
 'b' is a complicated attack.
 'c' is too soft.
 'd' takes territory for influence, White can reverse the result.
 'e' is bad.]
 (;B[of]LB[pi:A][oj:B]C['a' in this position, 'b' if Black has territory on the lower half of the right side.]
 (;W[pi]
 ;B[pj]LB[ni:A][oi:B]C['a' pulls Black a line. 'b' doesn't.]
 (;W[ni]
 ;B[oj]LB[ng:B][oi:A]C['a' is correct, 'b' is too thin.]
 (;W[oi]C[
 * Joseki *]
 ;B[mk]C[This continuation may be possible.]
 ;W[ol]
 ;B[nj]
 ;W[mi]
 ;B[kk])
 (;W[ng]
 ;B[qg]))
 (;W[oi]))
 (;AE[qm]AW[nq]AB[qn]
 ;W[oj]))
 (;B[og]LB[qf:C][qg:D][ph:A][pi:B]C['a' is joseki, 'b' and 'c' are variations.
 'd' is bad.]
 (;W[ph]LB[oc:B][of:A][qf:C][oh:D][qj:1]C['a' is joseki.
 'b' risks a counterattack.
 'c' aims to connect.
 'd' weakens Black 1 and is wrong.]
 (;B[of]LB[oh:A][pj:B]C['a' in this position, 'b' if Black has an extension in the lower half.]
 (;W[oh]
 ;B[oj]
 ;W[mh]C[
 * Joseki *])
 (;AE[qm]AW[nq]AB[qn]
 ;W[pj]
 ;B[pk]
 ;W[oj]))
 (;B[oc]LB[nd:A][qf:B]C['a' defends, 'b' is a counterattack.]
 (;W[nd]
 ;B[of])
 (;W[qf]))
 (;B[qf]LB[oh:A][pj:B]C['a' in this position, 'b' if Black has an extension in the lower half.]
 (;W[oh]
 ;B[rh]
 ;W[ng]
 ;B[of]
 ;W[nj]LB[ri:A]C[Aims at 'a'.]
 ;B[pk])
 (;AE[qm]AW[nq]AB[qn]
 ;W[pj]
 ;B[pk]
 ;W[oj]
 ;B[qi]
 ;W[rh]))
 (;B[oh]
 ;W[pi]))
 (;W[pi]C[Light.]
 ;B[qg]
 ;W[qi]
 ;B[pj]
 ;W[oi]
 ;B[pl])
 (;W[qf]LB[pe:B][qe:C][ph:A]C[Figthting on 'a' is necessary, 'b' misses the side, 'c' gives White center moves.]
 (;B[ph]LB[pe:A][qg:B]C['a' is better than 'b'.]
 (;W[pe]
 ;B[qg]LB[oe:A][of:B]C['A is correct and furikawari, 'b' is a mistake.]
 (;W[oe]
 ;B[qe]
 ;W[qd]
 ;B[rf]
 ;W[re]
 ;B[qf]
 ;W[qc]C[The loss of the corner isn't bad, because it could be lost by a 3-3 invasion.])
 (;W[of]
 ;B[oe]
 ;W[pg]
 ;B[nf]
 ;W[pf]
 ;B[rf]))
 (;W[qg]
 ;B[qe]
 ;W[oh]
 ;B[of]LB[pi:A][ri:B]C['a' is possible, 'b' is bad.]
 (;W[pi]
 ;B[qh]
 ;W[qi]
 ;B[rh]
 ;W[ri])
 (;W[ri]
 ;B[oi]
 ;W[nh]
 ;B[qh]
 ;W[rh]
 ;B[rj]C[White dead.])))
 (;B[pe]
 ;W[ph])
 (;B[qe]
 ;W[of]
 ;B[pe]
 ;W[ph]))
 (;W[qg]
 ;B[qf]
 ;W[pi]
 ;B[qi]
 ;W[ph]
 ;B[pl]))
 (;B[qf]LB[ng:A][qh:B]C['a' or 'b' are ok.]
 (;W[ng])
 (;W[qh]))
 (;B[qg]
 ;W[qh]LB[qf:B][ph:A][rh:C]C['a' is joseki.
 'b' is too anxious.
 'c' fails to connect immediately and starts a fight.]
 (;B[ph]LB[og:A][pi:B]C['a' is joseki.
 'b' gives Black thickness for territory.]
 (;W[og]LB[of:D][qf:B][oh:A][rh:C]C['a' is joseki,
 'b' is bad as White gets a ponnuki.
 'c' gives a low position or a fight.
 'd' is bad.]
 (;B[oh]LB[qf:A][qi:B]C['a' is correct.
 'b' is a trick play.]
 (;W[qf]
 ;B[rg]LB[pe:B][qe:C][ng:A]TR[qc]C['a' takes influence leaving aji giving territory.
 'b' takes the corner for the side giving Black good shape, but fails with an additional Black stone on the triangled position.
 'c' takes territory giving influence.]
 (;W[ng]
 ;B[rf]
 ;W[nh]
 ;B[oj]LB[qe:B][nk:A]C[
 * Joseki *
 Later, White can close the center with 'a' or use his side-and-corner-aji
 on 'b'.]
 (;W[nk])
 (;W[qe]
 ;B[pe]
 ;W[rh]LB[qd:A][qi:B]C['a' takes the corner, 'b' takes the side.]
 (;B[qd]
 ;W[rj])
 (;B[qi]
 ;W[re])))
 (;W[pe]
 ;B[of]
 ;W[oe]
 ;B[ng]LB[qd:A][qe:B]TR[qc]C['a' is correct. If the varition is wrong because of an additional Black stone on the triangled position, only 'b' is possible but fails.]
 (;W[qd]
 ;B[qc]LB[rc:B][rd:A]C['a' keeps the corner, 'b' fails.]
 (;W[rd]
 ;B[rc]
 ;W[od])
 (;W[rc]
 ;B[rd]
 ;W[qe]
 ;B[rb]
 ;W[sc]
 ;B[sd]
 ;W[qb]
 ;B[pc]
 ;W[pb]
 ;B[sb]
 ;W[rc]
 ;B[sc]))
 (;AW[pb]AB[qc]
 ;W[qe]
 ;B[rd]
 ;W[re]
 ;B[qb]
 ;W[ob]
 ;B[rb]C[Blacak lives.]
 ;W[sc]C[Proof of life.]
 ;B[sd]
 ;W[se]
 ;B[qa]))
 (;W[qe]LB[pe:A][rh:B]C['a' is joseki, 'b' is a mistake.]
 (;B[pe]
 ;W[rh]
 ;B[ng]
 ;W[of]LB[ne:B][oe:C][nf:A]TR[nc]C['a' is joseki, 'b' fails to hurt the triangled stones. 'c' captures, if the squared stone is Black.]MA[kd]
 (;B[nf]
 ;W[oe]
 ;B[nd]
 ;W[rf]LB[od:A][ne:B]C['a' or 'b'.]
 (;B[od]
 ;W[sg]
 ;B[mc]C[
 * Joseki *])
 (;B[ne]
 ;W[sg]
 ;B[qg]
 ;W[rg]LB[mc:A][qc:B][od:C]C['a' is correct, 'b' attacks White and is also possible.
 'c' is useless.]
 (;B[mc])
 (;B[qc])
 (;B[od]C[White doesn't connect before the endgame.])))
 (;B[ne])
 (;AB[kd]
 ;B[oe]
 ;W[nf]
 ;B[mf]
 ;W[ne]
 ;B[nd]
 ;W[me]
 ;B[le]
 ;W[md]
 ;B[mc]
 ;W[od]
 ;B[ld]
 ;W[nd]
 ;B[nb]
 ;W[oc]
 ;B[pc]))
 (;B[rh]
 ;W[pe]
 ;B[of]
 ;W[ng])))
 (;W[qi]LB[pi:A][pj:B]C['a' is correct, 'b' is getting tricked.]
 (;B[pi]
 ;W[rj]
 ;B[ng]
 ;W[of]
 ;B[ne]
 ;W[qf]
 ;B[rg])
 (;B[pj]
 ;W[qf]
 ;B[rg]
 ;W[rf])))
 (;B[qf]
 ;W[pi]
 ;B[rh]
 ;W[oh]
 ;B[qi])
 (;B[rh]
 ;W[qf]LB[rg:A][qi:B]C['a' is correct. 'b' is a mistake.]
 (;B[rg]LB[pe:A][qe:B]C['a' to press, 'b' to fight.]
 (;W[pe]
 ;B[qe]
 ;W[of]
 ;B[rf]
 ;W[qd]
 ;B[pf]
 ;W[oe]
 ;B[qc])
 (;W[qe]))
 (;B[qi]
 ;W[rg]
 ;B[qh]
 ;W[pe]
 ;B[qe]
 ;W[of]
 ;B[rf]
 ;W[qd]
 ;B[re]
 ;W[pc]
 ;B[pf]
 ;W[od]))
 (;B[of]
 ;W[pi]
 ;B[oh]
 ;W[ng]
 ;B[qi]
 ;W[rh]))
 (;W[pi]
 ;B[og]LB[oh:B][qi:A]C['a' is correct, 'b' is bad.]
 (;W[qi]
 ;B[oi]
 ;W[pj])
 (;W[oh]
 ;B[pg]
 ;W[qi]
 ;B[oi]
 ;W[nh]
 ;B[ni]LB[mh:B][pj:A]C[White saves some stones on 'a' or 'b' and loses the other stones.]
 (;W[pj]
 ;B[mh]
 ;W[ng]
 ;B[mf])
 (;W[mh]
 ;B[pj]))))
 (;B[qf]
 ;W[ph])
 (;B[rh]
 ;W[rg]
 ;B[qf]
 ;W[ri]
 ;B[ph]
 ;W[qi]
 ;B[pi]
 ;W[og]))
 (;B[oj]
 ;W[qf]
 ;B[qe]
 ;W[of]
 ;B[pe]))
 (;AW[nc][kd][kp][nq]AB[pd][pf][pn][pp]
 ;W[pj]LB[pi:A][qi:B]C['a' secures territory.
 'b' is not aggressive enough.]
 (;B[pi]
 ;W[qk]LB[qi:A][oj:C][pk:B]C['a' or, with the ladder 'b'.
 'c' gives White more thickness.]
 (;B[qi]LB[oj:B][pk:A][om:C]C['a' is joseki.
 'b' emphasizes the center of the lower right side.
 'c' is light.]
 (;W[pk]LB[pb:A][ni:B][nk:C]C[
 * Joseki *
 Securing more territory on 'a' is correct. Black can prevent
 White influence on 'b' before 'a'.
 Fighting on 'c' is an overplay.]
 (;B[pb]LB[oi:A][rn:D][qq:C][pr:B]C[White makes influence on 'a' or attacks on 'b', 'c' or 'd'.]
 (;W[oi]
 ;B[oh]
 ;W[ni]
 ;B[nh]
 ;W[nk]LB[mi:B][pr:A]C['a' or 'b'.]
 (;B[pr]
 ;W[mh])
 (;B[mi]
 ;W[pr]))
 (;W[pr])
 (;W[qq])
 (;W[rn]))
 (;B[ni]
 ;W[nk]
 ;B[pb])
 (;B[nk]
 ;W[oi]
 ;B[oj]
 ;W[oh]
 ;B[pg]
 ;W[om]))
 (;W[oj])
 (;W[om]
 ;B[np]
 ;W[mp]
 ;B[no]))
 (;B[pk]
 ;W[oj]LB[oi:C][qi:A][ok:B]C['a' is correct, 'b' and 'c' are mistakes.]
 (;B[qi]LB[pl:B][pm:A]C['a' is sabaki if Black has the ladder.
 'b' initiates the ladder.]
 (;W[pm]LB[ok:A][on:B]C['a' is correct, 'b' gives White much influence.]
 (;B[ok]
 ;W[qn])
 (;B[on]
 ;W[ok]
 ;B[pl]
 ;W[ol]
 ;B[ql]
 ;W[qm]
 ;B[rl]
 ;W[rm]
 ;B[rk]
 ;W[om]))
 (;W[pl]))
 (;B[ok]
 ;W[qi]
 ;B[rj]
 ;W[nj]
 ;B[qh]
 ;W[nk]
 ;B[ql]C[White has influence.])
 (;B[oi]
 ;W[qi]
 ;B[rj]
 ;W[pl]
 ;B[ok]
 ;W[nj]
 ;B[ql]
 ;W[ph]
 ;B[oh]
 ;W[og]))
 (;B[oj]
 ;W[pk]
 ;B[qi]
 ;W[ok]))
 (;B[qi]
 ;W[pl]LB[oj:B][pk:A]C['a' is better than 'b'.]
 (;B[pk]
 ;W[ok]
 ;B[qk])
 (;B[oj]
 ;W[ok]
 ;B[pi]
 ;W[nj]
 ;B[pk]
 ;W[qk]))))
 (;B[rb]C[Weird move, but we can see it in some games. For example, it is a favorite move of Andrei Cheburahov (5d from Russia).
 Tenuki is always a best option for White.]
 (;W[qc]C[Not the best way for White.]
 ;B[pd]C[Trick move.]
 ;W[qd]
 ;B[pc]
 ;W[qb]
 ;B[qe]
 ;W[re]
 ;B[rf]LB[pb:A]C[White 'a' is the right punishment.]
 ;W[pb]
 ;B[nc]
 ;W[qf]
 ;B[pe]
 ;W[rg]
 ;B[rd]
 ;W[sf]
 ;B[rc]
 ;W[ob]C[White can win the capturing race.])
 (;W[pd]LB[qc:A][qe:B]C[Black has 2 ways now: 'a' or 'b'.])
 (;W[qe]
 ;B[oc]
 ;W[qh]C[Best way for White. Black is low and there are a lot of forcing moves later.])))

src/diana/tests/sgfParser.py

➞

Show inline comments

@@ @@ -2,7 +2,7 @@ import unittest @@
 from unittest import TestCase
 import os
-from ..sgfParser import Collection
 from sgfParser import Collection
 dataDir=os.path.join(os.path.dirname(__file__), "data")
@@ @@ -15,5 +15,9 @@ class TestCollection(TestCase): @@
 		with open(os.path.join(dataDir, "simple.sgf")) as f:
 			Collection(f.read())
 	def testComplexSgf(self):
 		with open(os.path.join(dataDir, "kogos.sgf")) as f:
 			Collection(f.read())
 if __name__ == '__main__':
 	unittest.main()

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