Game 180106 (AyaMC2_1CPU vs ControlBoy) on 9x9-GGOS shows how important it is to implement super-ko. White is so sure of it's win that it misses several oppotunities to "finish the deal". I haven't done it myself yet, because it does not happen very ofen, but when it happens like in this game, it's very annoying. Christoph