diff --git a/src/go.py b/src/go.py
--- a/src/go.py
+++ b/src/go.py
@@ -1,12 +1,15 @@
-class Go:
-	# 1: B, 0: _, -1: W
-	# resp. jakákoli čísla s opačnými znaménky
-	board=[[0]*19 for i in range(19)]
+BLACK=1
+WHITE=-1
+EMPTY=0
+
+
+class Go:
+	board=[[EMPTY]*19 for i in range(19)]
 	
-	def __init__(self): self.board=[[0]*19 for i in range(19)]
+	def __init__(self): self.board=[[EMPTY]*19 for i in range(19)]
 	
 	def move(self,color,y,x):
-		if self.board[x][y]!=0: return False
+		if self.board[x][y]!=EMPTY: return False
 
 		self.board[x][y]=color
 
@@ -15,14 +18,14 @@
 			if not self._floodFill(-color,x+i,y+j): self._remove()
 		self.temp=[[False]*19 for i in range(19)]
 		if not self._floodFill(color,x,y):
-			self.board[x][y]=0
+			self.board[x][y]=EMPTY
 			return False
 		return True
 
 	def _floodFill(self,color,x,y):
 		if x<0 or x>18 or y<0 or y>18: return False
 		if self.temp[x][y]: return False
-		if self.board[x][y]==0: return True
+		if self.board[x][y]==EMPTY: return True
 		if self.board[x][y]!=color: return False
 		self.temp[x][y]=True
 		return self._floodFill(color,x-1,y) or self._floodFill(color,x+1,y) or self._floodFill(color,x,y-1) or self._floodFill(color,x,y+1)
@@ -30,4 +33,4 @@
 	def _remove(self):
 		for i in range(19):
 			for j in range(19):
-				if self.temp[i][j]: self.board[i][j]=0
+				if self.temp[i][j]: self.board[i][j]=EMPTY