Counting Legal Positions in GoNumber of legal Go positions The 361 points on a 19x19 Go board can be colored empty, black, or white. Only some of the 3^361 possible positions are legal, namely those where every group of connected stones of the same color has an empty point adjacent to it. In the position above, black stones at E18 and N9 lack such ``liberties'', making the position illegal. Due to its capture rule, the positio
