Author: Robert Hyatt
Date: 12:32:13 07/12/99
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On July 12, 1999 at 15:21:18, Sylvain Renard wrote: >On July 12, 1999 at 10:16:11, Robert Hyatt wrote: > >>On July 12, 1999 at 03:46:02, Sylvain Renard wrote: >> >>>Using Crafty 16.5T (Fritz interface) with endgame tablebases, >>>I have noticed this bug (easy for me, my program has the same!!) : >>> >>>Start position: >>> >>>4k3/8/6P1/4K1P1/8/8/8/8 w - - 0 1 >>> >>>White: Ke5, pawns g5 & g6 >>>Black: Ke8 >>>white to move (machine = black, white = weak player!). >>>1.Kd6?? (there are several wining moves!) 1...Kf8= 2.Ke5 Ke8?? leading >>>to the start position, so Crafty 16.5T (Fritz interface) evaluation is 0.00 , >>>because of the repetition of the position! >>> This bug is not present in "normal" Crafty 16.11 (Winboard interface) so I >>>wanted to ask Mr Hyatt his explanation. >>> Thank you and best regards, >>> Sylvain Renard >> >> >>There doesn't appear to be anything wrong. Crafty considers two repetitions a >>draw, as it always has. In that regard, the above is a draw as far as it is >>concerned. > > A program should never play a losing move in this position! >Now the opponent can play 3.Ke6, 3.Kf5 or even 3.g7 and win. >I still consider that this is a bug! In a way it is. But then again, the human screwed up the first time he made a move too. Fixing it is easy. But it hurts performance. And it makes it much harder to find some cute draws that happen. I personally accept the problem as it generally is a non-issue...
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