Author: Simon Finn
Date: 01:19:26 10/12/01
Go up one level in this thread
On October 11, 2001 at 23:12:54, Slater Wold wrote: >On October 11, 2001 at 22:51:46, Dann Corbit wrote: > >>I originally thought I might have found a bug in Yace, but I don't think that is >>the case now. Rather, I think this position is broken. Does a human player >>know if Kf7 really is unbreakable? If it is, then every program I have tested >>is wrong (not unimaginable). We discussed this one a couple of weeks ago. Dedrle thought that 1. Kf7 wins, but in 1982 Minev published the refutation in the Encyclopaedia of Chess Endgames, so the position is broken. Simon >> >>[D]8/8/6K1/k2p4/2p5/2P4p/3P3P/8 w - - bm Kf7; id "(JAFM F. Dedrle,1928)"; c0 >>"Yace says Kf5 is a draw (analysis 31 plies). Nobody likes Kf7 long term"; > >Deep Junior 7 - W,S >8/8/6K1/k2p4/2p5/2P4p/3P3P/8 w - - 0 1 > >Analysis by Deep Junior 7: > >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5 Ka4 2.Ke6 > = (0.21) Depth: 6 00:00:01 >1.Kf5! > ² (0.51) Depth: 9 00:00:01 >1.Kf5! > ± (0.81) Depth: 12 00:00:01 2kN >1.Kf5! Ka4 2.Ke5 Kb3 3.Kxd5 Kc2 4.Kxc4 Kxd2 > ± (0.83) Depth: 12 00:00:01 4kN >1.Kf5 Ka4 2.Ke5 Kb3 3.Kxd5 Kc2 4.Kxc4 Kxd2 5.Kd4 > ± (0.78) Depth: 15 00:00:01 8kN >1.Kf5 Kb5 2.Kf4 Kc5 3.Kg3 d4 4.Kxh3 Kd5 5.Kg4 Ke4 > ± (0.99) Depth: 18 00:00:01 24kN, tb=13 >1.Kf5 Kb6 2.Kg4 Ka5 3.Kxh3 > ± (0.97) Depth: 21 00:00:01 104kN, tb=103 >1.Kf5 Kb5 2.Kf4 Kc5 3.Kg3 Kd6 4.Kxh3 Ke5 5.Kg3 Ke4 6.h4 Kd3 > ± (0.78) Depth: 24 00:00:02 251kN, tb=378 >1.Kf5 Kb5 2.Kf4 Kc5 3.Kg3 Kd6 4.Kxh3 Ke5 5.Kg4 Ke4 6.h4 Kd3 7.h5 d4 8.cxd4 Kxd4 > ± (0.91) Depth: 27 00:00:03 427kN, tb=1041 >1.Kf5 Kb5 > ² (0.61) Depth: 30 00:00:06 1025kN, tb=3133 >1.Kf5 Kb5 2.Kf4 Kc5 3.Kg4 d4 4.Kf3 dxc3 5.dxc3 Kb6 6.Kf4 Kb5 7.Ke4 Ka4 > ² (0.32) Depth: 33 00:00:10 2203kN, tb=7372 >1.Kf5 Kb5 > = (0.02) Depth: 36 00:00:19 5403kN, tb=16686 >1.Kf5 Kb5 2.Kf4 Kc6 3.Kg4 d4 4.Kf3 dxc3 5.dxc3 Kd5 6.Kf4 Kd6 7.Kg4 Ke5 8.Kh4 Kf4 >9.Kxh3 > = (0.00) Depth: 39 00:00:33 10689kN, tb=33511 >1.Kf7 Kb5 2.Ke7 Kc5 3.Kd7 d4 4.Ke6 dxc3 5.dxc3 Kc6 6.Ke5 Kc5 7.Ke4 Kc6 8.Ke3 Kd7 >9.Kf2 Ke6 10.Kg3 > ² (0.31) Depth: 39 00:00:39 12058kN, tb=40673 >1.Kf7 Kb5 > = (0.01) Depth: 42 00:01:18 34308kN, tb=88522 >1.Kf7 Kb5 2.Ke7 Kc5 3.Kd7 d4 4.Ke6 dxc3 5.dxc3 Kc6 6.Ke5 Kc5 7.Ke4 Kc6 8.Ke3 Kd5 >9.Kf4 Kd6 10.Kg4 > = (0.01) Depth: 45 00:02:55 114097kN, tb=238289 >1.Kf7 Kb5 2.Ke7 Kc5 3.Kd7 d4 4.Ke6 dxc3 5.dxc3 Kc6 6.Ke5 Kc5 7.Ke4 Kc6 8.Ke3 Kd5 >9.Kf4 Kd6 > = (0.01) Depth: 47 00:16:44 1498229kN, tb=1595350 > >(W, 11.10.2001) > >I was a little confused on your first post. Does Kf7 draw, and all others lose? > > > > > >Slate
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