def valid_givens(self, position=None, color=None):
if position:
candidates = self.adjacent_givens(position)
else:
candidates = self.givens.keys()
for gpos in candidates:
number = self.givens[gpos]
adjs = self.given_adjacencies[gpos]
if not valid.count_black(self, adjs, number):
return False
return True
def valid_domino(self, position=None, color=None):
for pos in self.black_positions:
adjs = self.adjacencies[pos]
if not valid.count_black(self, adjs, 1):
return False
return True
