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Subject: Re: an interesting pawn endgame

Author: Dieter Buerssner

Date: 14:51:06 02/16/04

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On February 15, 2004 at 08:44:23, Uri Blass wrote:

>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.

Nothing imopressive, but at least a fail low to 0.0 for Ke4.

Yace, P4, 2.53 GHz:

  91949817  1:43.6   1.15 21.  40.Ke4 a4 41.c5 bxc5 42.bxc5 h5 43.c6 Kd6 44.c7
                               Kxc7 45.Kxe5 Kc6 46.Kd4 Kd6 47.Kc4 Kc6 48.Kb4
                               Kd5 49.Kxa4 Kc4 50.Ka5 Kd4 51.Kb4 {HT} {80}
 101492026  1:53.1   0.75 22-- 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
                               Ke4 49.Kxa4 Kf3 50.Ka5 Kg2 51.Kb5 Kxh2 52.Ka6
                               {0}
 161019049  2:53.7   0.00 22t  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
                               Ke4H 49.Kxa4H Kf3H 50.Ka5H Kg2H 51.Kb4H Kxh2H
                               52.a4H Kxg3H {HT} {-80}
 179036247  3:17.1   0.01 22t+ 40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 bxc5
                               44.bxc5 h5 45.c6 Kd6 46.c7 h4 47.gxh4 g3
                               48.c8=Q gxh2 49.Kf5 Kd5
 212062600  3:58.3   0.39 22t  40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5
                               44.c6 Kd6 45.c7 Kxc7 46.Kxe5 Kc6 47.Ke6 Kc7
                               48.Kd5 Kb6H 49.Ke4H Kc6H 50.Ke5H Kc7H 51.Kd5H
                               Kb6H 52.Ke4H Kc6H 53.Ke5H Kc7H 54.Kd5HR {0}
 255117519  4:57.1   0.39 22.  40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5
                               44.c6 Kd6 45.c7 Kxc7 46.Kxe5 Kc6 47.Ke6 Kc7
                               48.Kd5 Kb6 49.Ke4 Kc6 50.Ke5 Kc7 51.Kd5 Kb6
                               52.Ke4 Kc6 53.Ke5 Kc7 54.Kd5 {0}
 297052462  5:57.4   0.79 23++ 40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 bxc5
                               44.bxc5 h5 45.c6 Kd6 46.c7 h4 47.gxh4 g3
                               48.c8=Q g2
 363018522  7:26.6   1.19 23t  40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5
                               44.c6 Kd6 45.c7 Kxc7 46.Kxe5 Kc6 47.Ke6 Kc7
                               48.Kd5 Kb6 49.Kd6H h5H 50.Kd5H Kb7H 51.Kc5H
                               Kc7H 52.Kxb5H {HT} {80}
 408890893  8:31.3   1.19 23.  40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5
                               44.c6 Kd6 45.c7 Kxc7 46.Kxe5 Kc6 47.Ke6 Kc7
                               48.Kd5 Kb6 49.Kd6 h5 50.Kd5 Kb7 51.Kc5 Kc7
                               52.Kxb5 {HT} {80}
 555626825 11:59.3   1.47 24t  40.Ke3 Kd6 41.Ke4 axb4 42.axb4 Ke6 43.c5 b5
                               44.c6 Kd6 45.c7 Kxc7 46.Kxe5 Kc6 47.Ke6 Kc7
                               48.Kd5 Kb6 49.Kd6 Kb7 50.Kc5 Kc7 51.Kxb5 Kd6
                               52.Kc4 h5 {80}

>I am not sure if white can win.
>
>It seems that Ke3 is an interesting move

After Ke3 axb, I get a mate score (with a bit of backwards analysis). I guess,
with some patience, a mate score can be achieved for Ke3.

Regards,
Dieter




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