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Subject: an interesting pawn endgame

Author: Uri Blass

Date: 05:44:23 02/15/04


[D]8/8/1p2k2p/p3p3/1PP3p1/P2K2P1/7P/8 w - - 0 40

It is interesting that chess programs give Ke4 a big advantage when it leads to
a draw.

I am not sure if white can win.

It seems that Ke3 is an interesting move

New game - Yace Paderborn
8/8/1p2k2p/p3p3/1PP3p1/P2K2P1/7P/8 w - - 0 1

Analysis by Shredder 7.04:

40.bxa5
  ²  (0.67)   Depth: 1/2   00:00:00
40.bxa5
  ²  (0.67)   Depth: 1/2   00:00:00
40.bxa5 Kf6
  ±  (0.99)   Depth: 2/3   00:00:00
40.bxa5 bxa5 41.c5
  +-  (2.00)   Depth: 2/4   00:00:00
40.bxa5 bxa5 41.h4
  +-  (2.00)   Depth: 2/4   00:00:00
40.bxa5 bxa5 41.Ke4 Kd6
  =  (-0.04)   Depth: 3/4   00:00:00
40.bxa5 bxa5 41.Ke4 Kd6
  ±  (0.86)   Depth: 3/4   00:00:00
40.bxa5 bxa5 41.Ke4 Kd6 42.Kf5
  ±  (0.83)   Depth: 4/7   00:00:00
40.bxa5 bxa5 41.Ke4 Kd6 42.a4 Kc5
  ±  (0.82)   Depth: 5/8   00:00:00
40.bxa5 bxa5 41.Ke4 Kd6 42.Kd3 Kc5 43.h4
  ²  (0.55)   Depth: 6/9   00:00:00  1kN
40.bxa5 bxa5 41.Ke4 Kd6 42.a4 Kc5 43.Kd3
  ²  (0.42)   Depth: 6/9   00:00:00  1kN
40.c5 Kf5 41.cxb6 e4+ 42.Kc3 h5 43.bxa5
  ²  (0.43)   Depth: 6/9   00:00:00  2kN
40.c5 axb4 41.axb4 bxc5 42.b5 Kd5 43.b6
  ²  (0.66)   Depth: 6/9   00:00:00  3kN
40.c5 axb4 41.axb4 bxc5 42.bxc5 Kd5 43.Kd2
  ²  (0.41)   Depth: 7/13   00:00:01  4kN
40.c5 axb4 41.cxb6 bxa3 42.b7 a2 43.b8Q a1Q 44.Qd6+ Kxd6
  =  (-0.09)   Depth: 7/13   00:00:01  5kN
40.c5 axb4 41.cxb6 bxa3 42.b7 a2 43.b8Q a1Q 44.Qc8+ Kd5 45.Qxg4
  =  (-0.12)   Depth: 7/13   00:00:01  6kN
40.bxa5 Kf5
  =  (0.18)   Depth: 7/13   00:00:01  6kN
40.bxa5 Kf5 41.axb6 h5 42.c5 e4+ 43.Kd4
  ²  (0.53)   Depth: 7/13   00:00:01  6kN
40.bxa5 bxa5 41.c5 Kd5 42.h3 gxh3 43.Kc3 Kxc5
  ²  (0.53)   Depth: 7/13   00:00:01  8kN
40.bxa5 bxa5 41.Ke4 Kd6 42.a4 Kc5 43.Kxe5 Kxc4 44.h3
  ²  (0.28)   Depth: 8/13   00:00:01  11kN
40.bxa5 bxa5 41.Ke4 Kd6 42.a4 Kc5 43.Kxe5 Kxc4 44.Kf5
  =  (0.08)   Depth: 8/13   00:00:01  12kN
40.Ke4 Kf6 41.bxa5 bxa5
  =  (0.09)   Depth: 8/13   00:00:01  16kN
40.Ke4 a4 41.c5 b5 42.Kd3 Kd5 43.Ke3 e4
  =  (0.25)   Depth: 8/13   00:00:01  17kN
40.Ke4 a4 41.c5 b5 42.c6 Kd6 43.c7 Kxc7 44.Kxe5
  ²  (0.31)   Depth: 9/13   00:00:01  26kN
40.Ke3 a4 41.Ke4 Kf6 42.c5 Kf7
  ²  (0.32)   Depth: 9/14   00:00:01  37kN
40.Ke3 a4 41.Ke4 Kd6 42.Kd3 Kc6 43.b5+ Kd6 44.c5+ bxc5
  ²  (0.32)   Depth: 9/14   00:00:01  38kN
40.Ke3 a4 41.Kd3 Kd6 42.Ke4 Ke6 43.c5 b5 44.c6 Kd6 45.c7 Kxc7 46.Kxe5
  ²  (0.31)   Depth: 10/14   00:00:02  65kN
40.Ke3 a4 41.Kd3 Ke7 42.Ke4 Kf6 43.c5 bxc5 44.bxc5 Ke6 45.c6 Kd6 46.Kf5 Kxc6
47.Kxe5
  ²  (0.30)   Depth: 11/16   00:00:02  130kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.Kd3 Kd7 44.Ke3 Ke7 45.Kd3 Ke6 46.Ke3 Kd7 47.Kd3
Ke7 48.Kd2 Kd7 49.Ke3 Ke7 50.Kd3 Ke6 51.Ke3 Kd7 52.Kd3 Ke7 53.Kd2 Kd7 54.Ke3
  ²  (0.51)   Depth: 12/25   00:00:02  236kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.Kd3 Kd7 44.Ke3 Ke7 45.Kd3 Ke6 46.Ke3 Kd7 47.Kd3
Ke7 48.Kd2 Kd7 49.Ke3 Ke7 50.Kd3 Ke6 51.Ke3 Kd7 52.Kd3 Ke7 53.Kd2 Kd7 54.Ke3
  ²  (0.51)   Depth: 13/25   00:00:02  321kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.Kd3 Ke7 44.Kc3 Kd7 45.Kd2 Kc6 46.h4 gxh3 47.g4
hxg4
  ²  (0.39)   Depth: 14/25   00:00:03  445kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.Kd3 Ke7 44.Ke3 Kd7 45.Kd3 Ke7 46.Ke3 Kd7 47.Kd3
Ke7 48.Ke3
  ²  (0.39)   Depth: 15/25   00:00:06  747kN
40.Ke4 axb4 41.axb4 h5 42.c5 Kf6
  ²  (0.40)   Depth: 15/30   00:00:08  1009kN
40.Ke4 axb4 41.axb4 h5 42.c5 Kf6 43.cxb6 Kg6
  ±  (0.75)   Depth: 15/30   00:00:08  1074kN
40.Ke4 a4 41.c5 b5 42.c6 Kd6 43.c7 Kxc7 44.Kxe5 Kc6 45.Kf4 h5 46.Kg5 Kd5 47.Kxh5
Kd4
  ±  (1.01)   Depth: 15/30   00:00:14  1544kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kd7 46.Kf4 Ke6
47.Kg5
  ±  (1.06)   Depth: 16/30   00:00:16  1752kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.c6 Kf7 44.Kxe5 h4 45.gxh4 g3 46.hxg3 Kg6
  ±  (1.07)   Depth: 16/30   00:00:17  2102kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.h3 gxh3 47.Kf6
Kd6 48.g4 hxg4
  ±  (1.37)   Depth: 16/32   00:00:19  2479kN
40.Ke3 a4 41.Ke4 h5 42.c5 b5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.h3 gxh3 47.Kf6
Kd6 48.g4 hxg4
  ±  (1.37)   Depth: 17/32   00:00:21  3017kN
40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5 44.c6 Kd6 45.Kf5 Kxc6 46.Kg6 Kd6
47.h4 gxh3 48.Kh7
  ±  (1.23)   Depth: 18/37   00:00:33  5355kN
40.Ke4 axb4 41.axb4 h5 42.c5 b5 43.c6 h4 44.gxh4 g3 45.hxg3 Kf7
  ±  (1.24)   Depth: 18/37   00:00:35  5686kN
40.Ke4 axb4 41.axb4 h5 42.c5 b5 43.c6 Kd6 44.Kf5 Kxc6 45.Kxe5 Kc7 46.Kf5 Kd7
47.Kg5 Ke6 48.Kg6 Ke5 49.Kxh5 Kf5 50.Kh4
  +-  (1.50)   Depth: 18/37   00:00:37  6174kN
40.Ke4 axb4 41.axb4 h5 42.c5 b5 43.c6 Kd6 44.Kf5 h4 45.gxh4 g3 46.hxg3 Kc7
  +-  (1.75)   Depth: 19/37   00:00:45  7809kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6
47.Kc4
  +-  (1.92)   Depth: 19/37   00:00:49  8608kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6
47.Kc4 Ke6 48.Kb4 Kd5 49.Kb5 Kd4 50.Kxa4
  +-  (2.06)   Depth: 20/37   00:01:01  10978kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6
47.Kc4
  +-  (1.98)   Depth: 21/41   00:01:28  16102kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6
47.Kc4 Ke5 48.Kb4 Kd4 49.Kxa4 Kc4 50.Ka5
  +-  (2.12)   Depth: 22/43   00:03:22  38502kN
40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7 Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6
47.Kc4
  +-  (2.16)   Depth: 23/44   00:05:13  58620kN
40.Ke3 axb4 41.axb4 Kd7 42.c5 b5 43.Kd3 h5 44.Ke4 Ke6 45.c6 Kd6 46.Kf5 h4
47.gxh4 e4 48.Kxg4 e3 49.c7 e2 50.c8Q e1Q 51.Qa6+ Kd7 52.Qxb5+
  +-  (2.17)   Depth: 23/47   00:07:16  82771kN
40.Ke3 axb4 41.axb4 Kd7 42.c5 b5 43.Ke4 Ke6 44.c6 Kd6 45.Kf5 Kc7
  +-  (2.51)   Depth: 23/47   00:08:36  103928kN

(Blass, Tel-Aviv 15.02.2004)



Uri



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