Author: John Merlino
Date: 16:00:37 07/25/03
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On July 25, 2003 at 18:53:38, Dave Gomboc wrote: >On July 25, 2003 at 18:14:25, Ed Schröder wrote: > >>On July 25, 2003 at 17:50:21, Ernst Walet wrote: >> >>>This afternoon my account on the chessbase server played a game against Rebel >>>12. To my astonishment Rebel missed a mate in one, and got mated right away. >>>Any thoughts on this, Ed? >> >>Yes, I have. >> >>Rebel claims a draw (50 moves rule) after 151.Bd3 which is ignored by the >>interface. >> >>Since blacks last pawn move is at move 101 is black allowed to make its 151th >>move? It's no capture, neither a pawn move. >> >>If so I have a bug in Rebel of over 20 years :) >> >>101. Bc2 d4 >>102. Bd3 Kg7 >> >>151. Bd3 Qg1# >> >>So what's the verdict? >> >>Ed > >Bug! > >You can only make draw claims when it is your turn. White cannot make a valid >draw claim based on the fifty-move rule after playing 151. Bd3. After Black >plays 151...Qg1# the game ends immediately due to checkmate. White never gets >another turn, so he has no chance to claim that the position is drawn by the >fifty-move rule. > >Dave Agreed. And would you believe that we had a similar bug to this in Chessmaster for many years? :-) jm
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