Author: Robert Hyatt
Date: 08:27:09 04/11/01
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On April 11, 2001 at 03:01:27, Ernst Walet wrote: >On April 10, 2001 at 23:23:21, Derek wrote: > >>This position is a study that I saw on the following website: >>http://www.chesscafe.com/endgame/endgame.htm >> >>White: Kc5,Nd5,Ng6,Bh7 >>Black: Ka5,Ba2,a3 >> >>White to move >> >>Rebel-Tiger 14.0, using all 3,4, and 5-man tablebases >> >>After the moves: >> >>1.Nc3 Bb1 2.Nxb1 a2 3.Nd2 Bb1 is probably not the best move. It leads to an instant mate in 30 according to crafty, while Be6 prolongs it. Nxb1 a2 Nd2 leaves things at a mate in 29 for white. a1=B changes it to a mate in 12. There is a bug somewhere. I would suspect that the program is recognizing that KBNN vs KB is somehow a draw, when it is not. It ends up as a KBN vs K ending or a KBNN vs K ending, either of which is easily won. >> >>Tiger analyzes 3...a1=Q as lost for Black, but shows 3...a1=B as a draw for >>Black. This is clearly incorrect, as after 4 Nb3+ Ka4 5 Nxa1, it's evaluation >>changes to show that Black is mated in 10 moves. Is this a serious evaluation >>error in the program? > > >What happens if you disable the tablebases? > >Ernst. That would be a good test...
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