There seems to be a bug in GNU Chess 5.0 which caused it to lose the attached game (with 23... Kh8) rather than settle for a draw by perpetual check with (23...Kf8 24. Qe7+ Kg8 25. Qe6+ Kf8 and so on). It seems strange that the program chooses to give white mate in two rather than settle for a draw.

Mike Roberts

Attachment: Loss over Perpetual.pgn
Description: application/chess-pgn

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