Black is flagged for an illegal Ko at the end of game 738921 on CGOS. Black played H1, which looks legal to me. Server bug? Scanning through the log today, I found a similar situation in game 738998. The setup is that two stones in the corner are captured by playing 1 stone. Recapture of the capturing stone is declared a Ko. There was no SuperKo repetition involved in either game. Best, Brian
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