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Subject: Re: Tricky pawn endgame

Author: Mike Byrne

Date: 06:52:10 08/22/03

Go up one level in this thread


gh5 is never considered

New game
[d]8/p2k2p1/1p6/5P1p/P5P1/5K1P/8/8 w - - 0 1

Analysis by Crafty 19.04 ST:

1.Kf4 Ke7 2.Kg5 hxg4 3.hxg4 Kd6
  =  (0.01)   Depth: 4   00:00:00
1.Kf4
  ²  (0.41)   Depth: 5   00:00:00
1.Kf4 Kd6 2.Kg5 hxg4 3.hxg4 Ke7 4.Kg6 Kf8
  ²  (0.41)   Depth: 5   00:00:00
1.Kf4 Kd6 2.Kg5 hxg4 3.hxg4 Ke7 4.Kg6 Kf8
  ²  (0.41)   Depth: 5   00:00:00
1.Kf4 Ke7 2.Kg5 a6 3.gxh5 b5 4.h6 gxh6+ 5.Kxh6 bxa4 6.Kg6 Kd6
  ²  (0.28)   Depth: 6   00:00:00  130kN
1.Kf4 Ke7 2.Kg5 a6 3.gxh5 b5 4.h6 gxh6+ 5.Kxh6 bxa4 6.Kg6 Kd6
  ²  (0.28)   Depth: 6   00:00:00  156kN
1.Kf4 Ke7 2.Ke5 h4 3.g5 a6 4.Kd5 b5 5.a5 Ke8 6.g6 b4
  =  (0.17)   Depth: 7   00:00:01  345kN
1.Kf4 Ke7 2.Ke5 h4 3.g5 a6 4.Kd5 b5 5.a5 Ke8 6.g6 b4
  =  (0.17)   Depth: 7   00:00:01  437kN
1.Kf4 hxg4 2.hxg4 a6 3.Ke4 Ke7 4.Ke3 Kd7 5.Kd4 Kd6
  ²  (0.46)   Depth: 8   00:00:01  1040kN
1.Kf4 hxg4 2.hxg4 a6 3.Ke4 Ke7 4.Ke3 Kd7 5.Kd4 Kd6
  ²  (0.46)   Depth: 8   00:00:01  1174kN
1.Kf4 Ke7 2.g5 a6 3.Ke5 b5 4.a5 Kf8 5.Kd5 Ke7 6.Kc5 h4 7.g6 Kd7
  =  (0.18)   Depth: 9   00:00:03  2868kN
1.Kf4 Ke7 2.g5 a6 3.Ke5 b5 4.a5 Kf8 5.Kd5 Ke7 6.Kc5 h4 7.g6 Kd7
  =  (0.18)   Depth: 9   00:00:03  3335kN
1.Kf4 Ke7 2.Ke5 a6 3.gxh5 Kf7 4.h4 b5 5.a5 b4 6.Kd4 Kf6 7.Ke4
  ²  (0.27)   Depth: 10   00:00:06  6360kN
1.Kf4 Ke7 2.Ke5 a6 3.gxh5 Kf7 4.h4 b5 5.a5 b4 6.Kd4 Kf6 7.Ke4
  ²  (0.27)   Depth: 10   00:00:07  7862kN
1.Kf4 Ke7 2.Ke5 a6 3.gxh5 Kf8 4.h4 Kf7 5.Kd4 Kf6 6.Ke4 Ke7 7.Ke5
  =  (0.12)   Depth: 11   00:00:11  12614kN
1.Kf4 Ke7 2.Ke5 a6 3.gxh5 Kf8 4.h4 Kf7 5.Kd4 Kf6 6.Ke4 Ke7 7.Ke5
  =  (0.12)   Depth: 11   00:00:14  14889kN
1.Kf4 Ke7 2.Ke5 a6 3.gxh5 Kf8 4.h4 Kf7 5.Kd4 Kf6 6.Ke4 Ke7 7.Ke5 Kd7
  =  (0.12)   Depth: 12   00:00:20  21425kN

(Byrne, Secane, PA USA 22.08.2003)

but it doen't see the win either after gh5

New game
[d]8/p2k2p1/1p6/5P1P/P7/5K1P/8/8 b - - 0 1

Analysis by Crafty 19.04 ST:

1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4
  =  (0.02)   Depth: 6   00:00:00  15kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4
  =  (0.02)   Depth: 6   00:00:00  22kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4 Ke7
  =  (0.02)   Depth: 7   00:00:00  35kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4 Ke7
  =  (0.02)   Depth: 7   00:00:00  48kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4 Ke7 5.Ke5 Kd7
  =  (0.12)   Depth: 8   00:00:00  83kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.Ke4 Ke7 5.Ke5 Kd7
  =  (0.12)   Depth: 8   00:00:00  114kN
1...Ke7
  ³  (-0.28)   Depth: 9   00:00:01  176kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.h6 gxh6 5.h5 b5 6.a5 b4 7.Ke4
  ³  (-0.34)   Depth: 9   00:00:01  257kN
1...Ke7 2.Kf4 Kf6 3.h4 a6 4.h6 gxh6 5.h5 b5 6.a5 b4 7.Ke4
  ³  (-0.34)   Depth: 9   00:00:01  322kN
1...Ke7 2.h4 Kf6 3.h6 gxh6 4.Ke4 a6 5.Kf4 b5 6.a5 b4 7.Ke4 b3
  ³  (-0.37)   Depth: 10   00:00:01  985kN
1...Ke7 2.h4 Kf6 3.h6 gxh6 4.Ke4 a6 5.Kf4 b5 6.a5 b4 7.Ke4 b3
  ³  (-0.37)   Depth: 10   00:00:01  1092kN
1...Ke7 2.h4 Kf6 3.Kf4 a6 4.Ke4 Kf7 5.Kd5 Kf6 6.Ke4
  =  (0.00)   Depth: 11   00:00:02  1808kN
1...Ke7 2.h4 Kf6 3.Kf4 a6 4.Ke4 Kf7 5.Kd5 Kf6 6.Ke4
  =  (0.00)   Depth: 11   00:00:02  2247kN
1...Ke7 2.h4 Kf6 3.Kf4 a6 4.Ke4 Ke7 5.Ke5 Kf7 6.Kd4 Kf6 7.Ke4
  =  (0.00)   Depth: 12   00:00:04  3427kN
1...Ke7 2.h4 Kf6 3.Kf4 a6 4.Ke4 Ke7 5.Ke5 Kf7 6.Kd4 Kf6 7.Ke4
  =  (0.00)   Depth: 12   00:00:04  3999kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 13   00:00:13  14146kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 13   00:00:14  15438kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 14   00:00:20  20669kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 14   00:00:21  21896kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 15   00:00:28  28942kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 15   00:00:31  31368kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 16   00:00:44  44295kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 16   00:00:48  48682kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 17   00:01:09  71858kN
1...Ke7 2.Ke4 Kf6 3.Kd5 a6 4.h6 gxh6 5.Kc6 b5 6.axb5 axb5 7.Kxb5
  =  (0.01)   Depth: 17   00:01:18  81432kN

(Byrne, Secane, PA USA 22.08.2003)




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