Author: John Merlino
Date: 10:50:49 04/02/02
Go up one level in this thread
On April 01, 2002 at 13:40:13, Roy Eassa wrote: > >[d] 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 >Black to move and draw. > >I would think this would be trivially easy for today's programs running on fast >PCs, but (maybe) it isn't. There are only two first moves for Black that draw; >everything else loses: > >1...g5! > > [also drawing is 1...Kf7 2.Kd6 > (2.h4 g5 3.h5 gxf4 4.Ke5 Ke7 5.Kxf5 Kf7 6.Kxf4 Kf6 7.g3 Ke6 =) > 2...Kf6 3.h4 g5 4.g3 Kg6 5.hxg5 > (5.Ke6 g4=) > 5...hxg5 6.Ke6 gxf4 7.gxf4 Kg7 8.Kxf5 Kf7 =] > > [1...h5? 2.h4 +- > (2.g3 also wins)] > > [1...Ke7? 2.Ke5+-] > >2.g3 g4 3.h4 > > [3.hxg4 fxg4 and Black pushes the pawn to h4 for a simple draw.] > >3...Kg6 4.Ke5 Kh5 = Chessmaster doesn't fail low on 1...Kf7 until depth 19, so it doesn't find 1...g5 until 2:16 on a PIII-600: Time Depth Score Positions Moves 0:00 5/6 0.38 1849 1...g5 2.g3 gxf4 3.gxf4 h5 4.h4 Ke7 5.Ke5 0:00 5/6 0.34 2336 1...Ke7 2.Ke5 h5 3.g3 Kd7 4.Kd5 0:00 5/6 0.32 2567 1...Kf7 2.Ke5 h5 3.g3 Ke7 4.h4 0:00 6/7 0.36 3745 1...Kf7 2.Ke5 h5 3.g3 Ke7 4.h4 Kd7 0:00 6/7 0.34 6166 1...g5 2.g3 h5 3.fxg5+ Kxg5 4.Ke5 h4 5.Kd4 0:00 7/8 0.48 9356 1...g5 2.g3 h5 3.fxg5+ Kxg5 4.Ke5 h4 5.Kd4 f4 0:00 7/8 0.36 12261 1...Kf7 2.Kd6 Kf6 3.g3 h5 4.h4 Kf7 5.Ke5 Ke7 0:00 8/9 0.36 17209 1...Kf7 2.Kd6 Kf6 3.g3 h5 4.h4 Kf7 5.Ke5 Ke7 0:00 9/10 0.32 26881 1...Kf7 2.Kd6 Kf6 3.g3 h5 4.h4 Kf7 5.Kd5 Ke7 6.Ke5 0:00 10/11 0.36 50666 1...Kf7 2.Kd6 Kf6 3.h4 g5 4.g3 Kg6 5.Ke6 g4 6.Ke5 h5 0:01 11/12 0.26 94103 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.Kd5 Kf7 5.Ke5 Ke7 6.g3 Kf7 7.Kd5 Kf6 0:01 12/13 0.26 140511 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.Kd5 Kf7 5.Ke5 Ke7 6.g3 Kf7 7.Kd5 Kf6 0:01 13/14 0.22 198888 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.Kd5 Kf7 5.Ke5 Ke7 6.g3 Kf7 7.Kd6 Kf6 8.Kd5 0:02 14/15 0.14 294276 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.Kd5 Kf7 5.Ke5 Ke7 6.g3 Kf7 7.Kd5 Ke7 8.Kc5 Ke6 9.Kd4 0:03 15/16 0.14 407154 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.Kd5 Kf7 5.Ke5 Ke7 6.g3 Kf7 7.Kd5 Ke7 8.Kc5 Ke6 9.Kd4 0:06 16/17 0.49 817163 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.g3 Kf7 5.Kd7 Kf6 6.Ke8 Kg7 7.Ke7 Kg8 8.Kf6 Kh7 9.Ke6 Kg7 10.Ke5 0:07 17/18 0.34 1063213 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.g3 Kf7 5.Kd7 Kf6 6.Ke8 Kg7 7.Ke7 Kg8 8.Kf6 Kh7 9.Ke5 Kg7 10.Ke6 0:10 18/19 0.48 1359492 1...Kf7 2.Kd6 Kf6 3.h4 h5 4.g3 Kf7 5.Kd7 Kf6 6.Ke8 Kg7 7.Ke7 Kg8 8.Kf6 Kh7 9.Ke5 Kg7 10.Ke6 Kh6 11.Kd5 0:49 19/20 2.03 5419964 1...Kf7 2.h4 Kf6 3.h5 gxh5 4.g3 Ke7 5.Ke5 Kf8 6.Kf6 Ke8 7.Kg6 Ke7 8.Kxh6 Kf6 9.Kxh5 Ke7 10.Kg5 Ke6 11.g4 2:16 19/20 0.37 13308671 1...g5 2.g3 g4 3.h4 Kg6 4.Ke5 Kh5 5.Kd6 Kg6 6.Kd5 Kh5 7.Ke5 Kg6 8.Ke6 Kh5 9.Kd7 Kg6 10.Kd6 Kh5 11.Kc6 Kg6 12.Kc5 Kh5 13.Kd4 Kg6 2:55 20/21 0.12 17437136 1...g5 2.g3 g4 3.h4 Kg6 4.Ke5 Kh5 5.Kd6 Kg6 6.Kd5 Kh5 7.Ke5 Kg6 8.Ke6 Kh5 9.Kd7 Kg6 10.Kd6 Kh5 11.Ke6 Kg6 12.Kd7 Kh5 13.Kc6 Kg6 14.Kc5 Kf6 3:48 21/22 0.46 22907936 1...g5 2.g3 g4 3.h4 Kg6 4.Ke5 Kh5 5.Kd6 Kg6 6.Kd5 Kh5 7.Ke5 Kg6 8.Ke6 Kh5 9.Ke7 Kg6 10.Kd6 Kh5 11.Ke6 Kg6 12.Ke7 Kh5 13.Kd7 Kg6 14.Kc6 Kh5 15.Kd5 jm
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