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Subject: Re: Testposition - Pawn ending II

Author: Andrew Dados

Date: 12:35:26 12/28/01

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On December 28, 2001 at 12:17:30, Dieter Buerssner wrote:

>On December 28, 2001 at 05:12:55, Sune Larsson wrote:
>
>>
>> [D]8/2p1k3/3p3p/2PP1pp1/1P1K1P2/6P1/8/8 w - - 0 1
>>
>> It's amazing how many tricks and tactics there can be hidden in
>> apparently simple pawn endings! Like this one - 5 pawns each, nicely
>> grouped. White has a latent passer on the queenside - and black ditto
>> on the kingside. Both kings are occupied by keeping an eye on these
>> runners, so it should be a draw - or...?
>>
>> It's a position from Camacho Martinez - Hernandez, 1995.
>> White won it with the brilliant 1.g4!!
>
>Again, I have no idea how Tiger an Rebel reach this depth so fast.

They just prune as hell... notice they see g4 at d=17 or d=20; Yace sees it at
d=15 :)

-Andrew-

Yace on my
>K6-2 475 with 30M hash:
>
> 171706680 16:51.7   0.33 13.  1. Ke3 dxc5 2. bxc5 g4 3. Kd4 h5 4. Ke3 Kf6 5.
>                               Kd3 Ke7 6. Ke2 Kd7 7. Kd2 Ke7 8. Kd3 Kd7 9. Kc4
>                               h4 10. gxh4 g3 11. c6+ Ke7 {HT} {80}
> 424150223 41:09.2   0.00 14t  1. Ke3 c6 2. dxc6 dxc5 3. b5 Kd6 4. Kf3 Kc7 5.
>                               Ke3 Kd6 {0}
> 441335848 42:59.6   0.01 14t+ 1. fxg5 hxg5 2. c6 Kd8 3. Ke3 Kc8 4. Kd3 Kb8 5.
>                               Kc4 Kc8 6. b5 g4 7. b6 cxb6 8. Kd3 Kc7 {-80}
> 455265135 44:28.2   0.09 14t  1. fxg5 hxg5 2. c6 Kd8 3. Ke3 Kc8 4. Kd3 Kb8 5.
>                               Kc4 Ka7 6. b5 f4 7. gxf4 gxf4 8. Kd3 Kb6 9. Ke4
>                               f3 10. Ke3 {0}
> 541680597 52:55.7   0.09 14.  1. fxg5 hxg5 2. c6 Kd8 3. Ke3 Kc8 4. Kd3 Kb8 5.
>                               Kc4 Ka7 6. b5 f4 7. gxf4 gxf4 8. Kd3 Kb6 9. Ke4
>                               f3 10. Ke3 {0}
> 614406340 1:00:35   0.00 15t  1. fxg5 hxg5 2. Ke3 dxc5 3. bxc5 Kf6 4. Kd3 Ke5
>                               5. Kc4 f4 6. gxf4+ gxf4 7. d6 cxd6 {EGTB} 8. c6
>                               f3 9. c7 f2! {Not all positions found in TB}
>                               {-80}
>1184883984 1:59:35   0.01 15t+ 1. g4 fxg4 2. f5 h5 3. cxd6+ cxd6 4. Ke3 g3 5.
>                               b5 g2 6. Kf2 g1=Q+ 7. Kxg1 g4 8. Kg2 h4 9. f6+
>                               Kxf6 10. b6 h3+ 11. Kg3 Ke7 12. b7 Kf6 13. b8=Q
>                               Ke5H {HT} {841}
>1377396792 2:19:04   0.49 15++ 1. g4 fxg4 2. f5 h5 3. cxd6+ cxd6 4. Ke3 g3 5.
>                               b5 g2 6. Kf2 h4 7. f6+ Kxf6 8. b6 h3 9. b7 h2
>                               10. Kxg2 g4 11. b8=Q h1=R
>1570536197 2:38:49   1.49 15++ 1. g4 fxg4 2. f5 h5 3. cxd6+ cxd6 4. Ke3 g3 5.
>                               b5 g2 6. Kf2 h4 7. f6+ Kxf6 8. b6 h3 9. b7 h2
>                               10. Kxg2 g4 11. b8=Q h1=R
>
>After which I stopped it.
>
>Regards,
>Dieter



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