Author: Kurt Utzinger
Date: 13:38:35 04/01/02
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 = ------------------------------------------------------------------------------- A fantastic test position and it seems as if all programs have some difficulties with it (Ath 1.4/256 32 MB hash) New position 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 Analysis by Shredder Paderborn: 1...g5 2.g3 h5 3.h4 g4 4.Kd6 Kg6 5.Ke5 = (0.00) Depth: 1/2 00:00:00 = (0.24) Depth: 8/16 00:00:01 10kN, tb=639 1...Kf7 2.Kd6 g5 3.g3 gxf4 4.gxf4 Kf6 5.Kd5 h5 6.h4 Kf7 7.Ke5 Kg6 = (0.23) Depth: 8/16 00:00:01 14kN, tb=712 = (0.24) Depth: 9/18 00:00:01 24kN, tb=977 1...g5 2.g3 Kf7 3.Ke5 g4 4.hxg4 fxg4 5.Kf5 h5 6.Kg5 Ke6 7.Kxh5 = (0.23) Depth: 9/18 00:00:01 30kN, tb=1159 +- (1.94) Depth: 11/22 00:00:02 80kN, tb=2243 1...Kf7 2.h4 g5 3.Ke5 Kg6 4.h5+ Kxh5 5.Kd6 gxf4 6.Ke7 f3 7.g3 f4 8.Ke6 fxg3 9.Kf6 Kh4 +- (1.93) Depth: 11/22 00:00:03 105kN, tb=2474 ± (1.15) Depth: 17/29 00:00:12 1643kN, tb=12232 1...g5 2.g3 g4 3.h4 Kg6 4.Kd6 Kh5 5.Ke5 Kg6 6.Kd6 Kh5 7.Ke5 Kg6 8.Kd6 Kh5 ± (1.14) Depth: 17/29 00:00:15 1777kN, tb=14589 ± (1.14) Depth: 29/41 00:02:03 19924kN, tb=187264 (Utzinger, MyTown 01.04.2002) ------------------------------------------------------------------------------------------- Utzinger,K - Fritz 7 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 Analysis by Fritz 7: 1...h5 2.g3 Kf7 3.Kd6 Kf6 4.h4 Kf7 5.Kd7 Kf6 6.Ke8 Ke6 7.Kf8 Kf6 8.Kg8 Ke6 = (0.00) Depth: 11/16 00:00:00 102kN, tb=22 ± (1.34) Depth: 18/26 00:00:05 1196kN, tb=3235 1...Kf7 2.h4 g5 3.g3 Kg6 4.Ke5 g4 5.Ke6 Kh5 ± (1.31) Depth: 18/26 00:00:08 1808kN, tb=4886 ± (1.25) Depth: 27/45 00:02:32 39590kN, tb=86475 (Utzinger, MyTown 01.04.2002) -------------------------------------------------------------------------------------------- Utzinger,K - Chess Tiger 14.0 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 Analysis by Chess Tiger 14.0: 1...h5 2.g3 Kf7 3.Kd6 Kf6 4.h4 Kf7 5.Kd7 Kf6 6.Ke8 Ke6 7.Kf8 Kf6 8.Kg8 Ke6 9.Kg7 Kd5 10.Kxg6 Ke6 11.Kg5 = (0.14) Depth: 14 00:00:00 119kN, tb=509 +- (2.88) Depth: 20 00:00:10 3558kN, tb=12613 1...g5 2.g3 g4 3.h4 Kg6 4.Ke5 Kh5 5.Kd4 Kg6 6.Kc5 Kh5 7.Kc4 Kg6 8.Kd5 Kh5 9.Ke5 Kg6 10.Ke6 Kh5 11.Kd6 +- (2.48) Depth: 20 00:00:13 4645kN, tb=17208 +- (1.86) Depth: 26 00:02:39 102649kN, tb=153317 (Utzinger, MyTown 01.04.2002) -------------------------------------------------------------------------------------------- Utzinger,K - Crafty 18.13 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 Analysis by Crafty 18.13: 1...Ke7 2.Ke5 -+ (-1.57) Depth: 1/3 00:00:00 ² (0.33) Depth: 2/3 00:00:00 1...g5 2.g3 g4 3.hxg4 fxg4 4.Kd4 Kf5 5.Kd3 h5 6.Ke3 h4 7.gxh4 ³ (-0.33) Depth: 2/3 00:00:00 ² (0.67) Depth: 11/17 00:00:00 158kN, tb=763 1...Kf7 2.Kd6 Kf6 3.g3 g5 4.Kd5 g4 5.hxg4 fxg4 6.Ke4 Ke6 7.Ke3 h5 8.Ke4 Kd6 9.Kf5 h4 10.Kxg4 = (0.00) Depth: 11/17 00:00:01 237kN, tb=1093 = (0.01) Depth: 25/45 00:02:29 67893kN, tb=91519 (Utzinger, MyTown 01.04.2002) -------------------------------------------------------------------------------------------- Utzinger,K - Gandalf 4.32h 8/8/5kpp/3K1p2/5P2/7P/6P1/8 b - - 0 1 Analysis by Gandalf 4.32h: 1...Kg7 2.Ke6 µ (-0.96) Depth: 2 00:00:00 1...h5 2.g3 g5 3.fxg5+ Kxg5 4.Ke5 µ (-0.97) Depth: 2 00:00:00 µ (-1.00) Depth: 5 00:00:00 1kN 1...g5 2.fxg5+ Kxg5 3.Ke5 f4 4.Ke4 h5 5.Kf3 µ (-1.02) Depth: 5 00:00:00 1kN ³ (-0.49) Depth: 7 00:00:00 10kN 1...h5 2.g3 Ke7 3.Kd4 Kf8 4.Ke3 Kg7 5.Kf3 ³ (-0.51) Depth: 7 00:00:00 10kN ³ (-0.36) Depth: 8 00:00:00 27kN 1...g5 2.g3 gxf4 3.gxf4 h5 4.h4 Kf7 5.Ke5 Kg6 6.Ke6 ³ (-0.38) Depth: 8 00:00:00 27kN +- (1.61) Depth: 11 00:00:01 139kN 1...Kg7 2.Ke6 h5 3.h4 Kg8 4.Kf6 Kh7 5.Kf7 +- (1.59) Depth: 11 00:00:01 150kN +- (1.52) Depth: 11 00:00:01 150kN 1...h5 2.h4 Kf7 3.Kd6 Kf6 4.g3 Kf7 5.Kd7 Kf6 6.Ke8 +- (1.50) Depth: 11 00:00:01 150kN +- (3.61) Depth: 19 00:00:22 8350kN 1...Kf7 2.Kd6 Kf6 3.h4 g5 4.g3 Kg6 5.Ke6 g4 +- (3.59) Depth: 19 00:00:58 27350kN +- (2.54) Depth: 19 00:02:06 73700kN 1...g5 +- (2.52) Depth: 19 00:02:08 74300kN 1...Kf7 2.h4 g5 3.g3 Kg6 4.Ke5 g4 5.Ke6 Kh5 6.Ke7 +- (2.38) Depth: 20 00:03:16 130700kN +- (2.38) Depth: 20 00:03:16 130700kN (Utzinger, MyTown 01.04.2002) ----------------------------------------
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