diff --git a/src/go/helperboard.py b/src/go/helperboard.py
new file mode 100644
--- /dev/null
+++ b/src/go/helperboard.py
@@ -0,0 +1,37 @@
+from util import EMPTY
+
+
+## Utility class for finding continuous regions on a Go.board.
+class HelperBoard:
+	def __init__(self,board):
+		self._refBoard=board # Go.board, readonly
+		self._boardSize=len(board)
+		self._board=[[EMPTY]*self._boardSize for i in range(self._boardSize)]
+		self._usedCoords=[0]*(self._boardSize**2)*2
+		self._usedCount=0
+
+	def floodFill(self,filling,r,c,needle=None):
+		if c<0 or c>=self._boardSize or r<0 or r>=self._boardSize: return False # out of range
+		if self._board[r][c]: return False # already visited
+		if self._refBoard[r][c]==needle: return True # found something
+		if self._refBoard[r][c]!=filling: return False # out of area boundary
+		self._board[r][c]=True # set visited
+		self._usedCoords[self._usedCount*2]=r
+		self._usedCoords[self._usedCount*2+1]=c
+		self._usedCount+=1
+
+		# check neighbors
+		return self.floodFill(filling,r,c-1) or \
+			self.floodFill(filling,r,c+1) or \
+			self.floodFill(filling,r-1,c) or \
+			self.floodFill(filling,r+1,c)
+
+	def continuousArea(self):
+		for i in range(self._usedCount):
+			yield (self._usedCoords[i*2],self._usedCoords[i*2+1])
+
+	def clear(self):
+		for i in range(self._usedCount):
+			(r,c)=(self._usedCoords[i*2],self._usedCoords[i*2+1])
+			self._board[r][c]=EMPTY
+		self._usedCount=0