hard endgame test position

[BBauer]

Hi,
on an AMD X2 5200+, 256 MB hash Rybka 1.0 Beta took 6:19 min
to find 1. ..h4. As the score climbs from 1.51 to 2.85 one can hope that rybka will win the position.

Code: Select all

FEN: 8/5pk1/8/3bP1pp/3P1p2/7P/3B1K2/8 b - - 0 1 

Rybka 1.0 Beta:
  24	00:21	  16.079.546	803.977	+1,51	f7f6 h3h4 Kg7g6 e5xf6 Kg6xf6 Kf2g1 Kf6f5 h4xg5 Kf5xg5 Bd2b4
  25	00:33	  23.596.325	737.385	+1,51	f7f6 h3h4 Kg7g6 e5xf6 Kg6xf6 Kf2g1 Kf6f5 h4xg5 Kf5xg5 Bd2b4
  26	01:01	  36.100.275	611.869	+1,51	f7f6 h3h4 Kg7g6 e5xf6 Kg6xf6 Kf2g1 Kf6f5 h4xg5 Kf5xg5 Bd2b4
  26	06:19	 142.674.518	385.606	+2,85	h5h4 Bd2b4 Kg7g6 Kf2g1 Kg6f5 Bb4a5 Kf5e4 Ba5d8 g5g4 h3xg4
  27	10:34	 224.871.894	363.282	+2,65	h5h4 Bd2b4 Kg7g6 Kf2g1 Bd5e6

regards
Bernhard

[smirobth]

Here is analysis by Glaurung 1.2.1 SMP
Analysis by Glaurung 1.2.1 SMP:

1...h4 2.Ba5 f5 3.exf6+ Kxf6 4.Bd8+ Kf5 5.Kg1 Be4 6.Be7 Bf3 7.Kf1 Bd5 8.Kg1 Bb3 9.Kf2 Bc4 10.Bd8 Be6
-/+ (-1.03) Depth: 17 00:00:02 2654kN

2...f5 is a mistake and gives up the win. Does Glaurung switch away from 2...f5 for 2...Kg6 if given more time?

[playjunior]

Here is analysis by Glaurung 1.2.1 SMP
Analysis by Glaurung 1.2.1 SMP:

1...h4 2.Ba5 f5 3.exf6+ Kxf6 4.Bd8+ Kf5 5.Kg1 Be4 6.Be7 Bf3 7.Kf1 Bd5 8.Kg1 Bb3 9.Kf2 Bc4 10.Bd8 Be6
-/+ (-1.03) Depth: 17 00:00:02 2654kN

2...f5 is a mistake and gives up the win. Does Glaurung switch away from 2...f5 for 2...Kg6 if given more time?

Yes, here it is:
Analysis by Glaurung 1.2.1 SMP:

...

1...h4 2.Bb4 Kg6 3.Be7 Kf5 4.Kg1 g4 5.hxg4+ Kxg4 6.Bb4 Kf3 7.Be1 h3 8.Bd2 Ke4 9.Kh2 f3 10.Kxh3 Kxd4 11.Be1 Kxe5 12.Kg3 Ke4 13.Kf2 Bc4 14.Bc3 f5
-+ (-2.48) Depth: 26 00:12:19 931mN

(, 20.08.2007)