Author: Ricardo Gibert
Date: 09:38:02 05/07/03
Go up one level in this thread
On May 07, 2003 at 02:39:21, Jarkko Pesonen wrote: >On May 06, 2003 at 18:36:37, Ricardo Gibert wrote: > >>On May 06, 2003 at 08:55:07, Robert Hyatt wrote: >> >>>On May 06, 2003 at 07:05:02, Jarkko Pesonen wrote: >>> >>>>Crafty 19.3 ends up in this position >>>> white black >>>> 1 d5 e5 >>>> 2 c6+ bxc6 >>>> 3 bxc6+ Kc8 >>>> 4 d6 e4 >>>> 5 Kd4 h5 >>>> 6 g4 hxg4 >>>> 7 hxg4 f4 >>>> 8 Kxe4 ... >>>> >>>>[D]2k5/8/2PP4/6p1/4KpP1/8/8/8 b >>>> >>>> 21-> 1:40 6.47 1. ... Kd8 2. Kd4 Kc8 3. Kd3 Kd8 4. >>>> Ke4 Kc8 5. Kf3 Kd8 6. Kf2 Kc8 7. Ke2 >>>> Kd8 8. Kd3 Kc8 9. Kc3 Kd8 10. Kd2 Kc8 >>>> 11. Ke1 f3 >>>> >>>>Seems that crafty isn't doing any progress and score is totally wrong(seems to >>>>be draw). >>>> >>>>Is there an easy way to fix this? >>>>Or is this some kind off odd situation that is so rare that it is not >>>>worth fixing? >>>> >>>>Jarkko >>> >>> >>>That can be fixed. It is the classic problem of two connected passed pawns >>>being valued too high in a king and pawn ending. If they were separated, >>>white would win easily. But together, they can be stopped. I will look >>>at this and fix it. The code is already there, it just has a hole that I >>>apparently overlooked. >> >>From the diagrammed position: >> >>1...Kd8 2.d7 Ke7 3.Kd4 Kd8 4.Kd5 Ke7 >> >> if 4...Kc7? 5.Ke6 f3 6.Ke7 7.f2 e8=Q+ wins more easily. >> >>5.Kc5 f3 6.Kb6 f2 >> >> if 6...Kd8? 7.Kb7 f2 8.c7+ Kxd7 9.c8=Q+ wins more easily too. >> >>7.Kc7 f1=Q 8.d8=Q+ looks like a win to me. > >You mean that the original position wasn't draw after all. >Can you refute moves Probably not. Not because I don't think they can be refuted, but because I'm too damn lazy to try! Sorry. > white black > 1 d5 e5 > 2 c6+ bxc6 > 3 bxc6+ Kc8 > 4 d6 e4 > 5 Kd4 h5 > 6 g4 hxg4 > 7 hxg4 f4 > 8 Kxe4 ...
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