Author: Dieter Buerssner
Date: 06:06:33 12/19/00
Go up one level in this thread
On December 18, 2000 at 17:38:17, Scott Gasch wrote:
>On December 18, 2000 at 15:03:36, José Antônio Fabiano Mendes wrote:
>...
>>
>> Or maybe this famous and beautiful pawn ending :
>> H.Mattison,1918 White to play and draw
>> 8/5p2/7k/6p1/5P1P/8/8/7K w
>> "Corresponding squares" to the rescue! JAFM
>
>What is the solution? My engine does not seem to find it in any reasonable
>amount of time. Unfortunately I do not have any endgame tables, though, so this
>may take longer(?). Here's my results:
With EGTBs, this is rather easy.
>I failed low at every depth from 15-30 and never got a score anywhere near draw.
> What do others see in this position (with EGTB turned off)?
Yace without EGTBs first gets a fail low (which needs a long time) and the a
fail high at depth 19.
After 47 seconds, it shows a draw score (this -0.1 is the score from drawn
KPK for the side without the P). With different hash replacement stratagies,
the solution may be found at different depths, but the time does not vary
too much (less than a factor of 2). One interesting thing here also is,
that when I not fail low at root, after ther first move failed low,
but rather test the remaining moves with the same window first, the solution
time for this will be much smaller.
1030028 4.290 -8.38 19--: 1.Kg2 Kh5 2.Kf3 gxh4 3.f5 h3 4.Kf4 h2 5.Ke5 h1=Q
6.Kf6 null 7.Kxf7 null 8.f6 null {-921}
10754269 45.81 -8.10 19t : 1.Kg2 Kh5 2.Kf3 gxh4 3.f5 h3 4.f6 Kg5 5.Kg3 Kxf6
6.Kxh3 Kf5 7.Kh4 Ke4 8.Kh5 f5 9.Kg6 f4 10.Kf7 f3
{HT} {-80}
10816896 46.10 -7.78 19t+: 1.hxg5+ Kh5 2.g6 fxg6 3.f5 gxf5 4.Kg1 Kg4 5.Kg2
f4 6.Kf2H Kf5H 7.Kf3H Ke5H 8.Kf2H Ke4H 9.Ke2H
Kd5H 10.Kf2H Kc5H 11.Kg1H Kd4H 12.Kf2H Kc4H
13.Kg1H Kd3H 14.Kf1H Ke3H 15.Ke1H Kf3H 16.Kf1H
Kg3H 17.Ke2H Kg2H 18.Kd2H f3H 19.Kc3H f2H
20.Kc4H f1=Q+H 21.Kc5H {-1001}
10844019 46.22 -7.14 19++: 1.hxg5+ Kh5 2.g6 Kxg6 3.Kg2 Kf5 4.Kf3 Kg6 5.Ke3
f6 6.Kd3 Kh5 7.Ke3 Kg4 8.Ke4 Kg3 9.f5 Kg4 10.Kd4
Kxf5 {-80}
10894321 46.43 -0.10 19t : 1.hxg5+ Kh5 2.g6 fxg6 3.f5 gxf5 4.Kg1 Kg4 5.Kg2
Kf4 6.Kf2 Ke4 7.Ke2 f4 8.Kf2 Kf5 9.Kf3 Kg5
10.Kf2 Kg4 {-80}
10914459 46.51 -0.10 19. : 1.hxg5+ Kh5 2.g6 fxg6 3.f5 gxf5 4.Kg1 Kg4 5.Kg2
Kf4 6.Kf2 Ke4 7.Ke2 f4 8.Kf2 Kf5 9.Kf3 Kg5
10.Kf2 Kg4 {-80}
Regards,
Dieter
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