Author: Dave Gomboc
Date: 15:53:38 07/25/03
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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
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