diff --git a/src/go/core.py b/src/go/core.py
--- a/src/go/core.py
+++ b/src/go/core.py
@@ -35,7 +35,7 @@ class Go:
 			self._helper.clear()
 			if not self._helper.floodFill(-color,row+r,col+c,EMPTY): self._remove()
 
-		# check for suicide
+		# check for suicide and prevent it
 		self._helper.clear()
 		if not self._helper.floodFill(color,row,col,EMPTY):
 			self.board[row][col]=EMPTY
@@ -46,7 +46,7 @@ class Go:
 		return True
 
 	def undoMove(self,r,c,captures):
-		assert self.board[r][c]==-1*self.toMove
+		assert self.board[r][c]==-1*self.toMove, "{0}!={1}".format(self.board[r][c],-1*self.toMove)
 		self.toMove*=-1
 		self.board[r][c]=self.toMove
 		if len(captures)>0:
@@ -62,6 +62,11 @@ class Go:
 		(r,c,color)=res
 		return self.doMove(color,r,c)
 
+	def load(self,board):
+		for (r,row) in enumerate(board):
+			for (c,x) in enumerate(row):
+				self.board[r][c]=x
+
 	def hash(self):
 		return hashBoard(self.board)