diff --git a/src/image_analyzer.py b/src/image_analyzer.py
--- a/src/image_analyzer.py
+++ b/src/image_analyzer.py
@@ -1,22 +1,26 @@
-from go import *
+import logging
+from go import *
 
 
 class ImageAnalyzer:
 
-	def __init__(self):
+	def __init__(self,tresB=30,tresW=60):
 		self.board=[[Go.EMPTY]*19 for r in range(19)]
 		self.grid=None
 
-	def analyze(self,image,tresB,tresW,sizeCoef,shift):
+		self.tresB=tresB
+		self.tresW=tresW
+
+	def analyze(self,image,sizeCoef,shift):
 		if self.grid==None: return False
 
 		for r in range(19):
 			for c in range(19):
 				intersection=self.grid.intersections[r][c]
 
-				self.board[r][c]=self.analyzePoint(image,intersection*sizeCoef+shift,*(self.grid.stoneSizeAt(r,c,sizeCoef)),tresB,tresW)
+				self.board[r][c]=self.analyzePoint(image,r,c,intersection*sizeCoef+shift,*(self.grid.stoneSizeAt(r,c,sizeCoef)))
 
-	def analyzePoint(self,image,imageCoords,stoneWidth,stoneHeight,tresB,tresW):
+	def analyzePoint(self,image,row,col,imageCoords,stoneWidth,stoneHeight):
 		b=w=e=0
 
 		((x1,y1),(x2,y2))=self.relevantRect(imageCoords,stoneWidth,stoneHeight)
@@ -28,10 +32,12 @@ class ImageAnalyzer:
 				I=(red+green+blue)/255/3
 				m=min(red,green,blue)
 				S=1-m/I
-				if 100*I<tresB: b+=1
-				elif 100*I>tresW: w+=1
+				if 100*I<self.tresB: b+=1
+				elif 100*I>self.tresW: w+=1
 				else: e+=1
 
+		logging.debug("(%d,%d) ... (b=%d,w=%d,e=%d)", row, col, b, w, e)
+
 		if b>=w and b>=e: return Go.BLACK
 		if w>=b and w>=e: return Go.WHITE
 		return Go.EMPTY