diff --git a/src/gui.py b/src/gui.py
old mode 100644
new mode 100755
--- a/src/gui.py
+++ b/src/gui.py
@@ -1,13 +1,14 @@
 import tkinter as tk
 from PIL import ImageTk
 import PIL
-import math
-from epoint import *
 from corners import *
 from grid import *
 from image_analyzer import *
 from go import *
 
+showBigPoints=True
+showGrid=False
+
 
 class Application(tk.Frame):
   def __init__(self, master=None):
@@ -57,10 +58,18 @@ class Application(tk.Frame):
   ## Redraws the current image and its overlay.
   def redrawImgView(self):
     self.imgView.create_image(2,2,anchor="nw",image=self.img)
+
+    origWidth,origHeight=self.imgOrig.size
+    widthRatio=origWidth/self.img.width()
+    heightRatio=origHeight/self.img.height()
+    sizeCoef=max(widthRatio,heightRatio)
+    tresB=self.scaleTresB.get()
+    tresW=self.scaleTresW.get()
+
     for corner in self.corners.corners:
       self.markPoint(corner.x,corner.y)
     
-    if self.boardGrid!=None:
+    if self.boardGrid!=None and showGrid:
       for r in range(19):
         a=self.boardGrid.intersections[r][0]
         b=self.boardGrid.intersections[r][-1]
@@ -69,16 +78,15 @@ class Application(tk.Frame):
         a=self.boardGrid.intersections[0][c]
         b=self.boardGrid.intersections[-1][c]
         self.imgView.create_line(a.x,a.y,b.x,b.y,fill='#00ff00')
+
+    if self.boardGrid!=None and showBigPoints:
+      for r in range(19):
+        for c in range(19):
+          ((r1,c1),(r2,c2))=self.boardView.detector.relevantRect(self.boardGrid.intersections[r][c],*(self.boardGrid.stoneSizeAt(r,c,sizeCoef)))
+          self.imgView.create_rectangle(r1,c1,r2,c2,outline="#00ffff")
     
     self.imgView.grid()
     
-    origWidth,origHeight=self.imgOrig.size
-    widthRatio=origWidth/self.img.width()
-    heightRatio=origHeight/self.img.height()
-    sizeCoef=max(widthRatio,heightRatio)
-    tresB=self.scaleTresB.get()
-    tresW=self.scaleTresW.get()
-    
     shift=EPoint(origWidth-self.img.width()*sizeCoef,origHeight-self.img.height()*sizeCoef)/2
     
     self.boardView.redrawState(self.imgOrig,sizeCoef,shift,tresB,tresW)
@@ -91,7 +99,7 @@ class Application(tk.Frame):
     self.imgView.grid()
 
 
-## Handles and presents the game state as detected by the program.   
+## Handles and presents the game state as detected by the program.
 class BoardView(tk.Canvas):
   def __init__(self, master=None):
     self.detector=ImageAnalyzer()
@@ -99,7 +107,7 @@ class BoardView(tk.Canvas):
     
     tk.Canvas.__init__(self, master)
     self.configure(width=360,height=360,background="#ffcc00")
-    
+
     self.drawGrid()
     
     self.grid()
@@ -109,6 +117,9 @@ class BoardView(tk.Canvas):
   # @param tresB upper intensity treshold for a pixel to be considered black, [0-100]
   # @param tresW lower intensity treshold for a pixel to be considered white, [0-100]
   def redrawState(self,img,sizeCoef,shift,tresB,tresW):
+    self.create_rectangle(0,0,360,360,fill="#ffcc00")
+    self.drawGrid()
+
     self.detector.analyze(img,tresB,tresW,sizeCoef,shift)
     
     for r,row in enumerate(self.detector.board):