Author: Edward Screven
Date: 17:30:37 03/06/99
Go up one level in this thread
On March 05, 1999 at 18:38:40, Stuart Cracraft wrote:
>This is some kind of monster problem for some programs that don't
>have some feature.
>
>GNU Chess 5.0 took quite a while to find h4 and not until 8 ply at that.
>
>So the question is, Bob, what do you think in Crafty is enabling it
>to see the solution sooner than Rebel or GNU Chess 5.0 BETA?
i don't think finding this depends on anything special. maybe gnuchess
is pruning too agressively. i've included output from my own program
(on a pentium 133) so you can compare PVs.
- edward
0.14 5 -0.82 Re1 Bd7 Bf6 Kh5 e8=Q Bxe8 Rexe8
0.15 5 > +0.00 Rh4+
0.16 5 +0.00 Rh4+ Kg5 Bf6+ Kf5 Bd4+ Kg5 Bf6+
0.32 5 > +0.01 h4
0.36 5 > +0.51 h4
0.52 5 > +1.51 h4
0.68 5 +1.55 h4 g5 Rxe8 Qc1+ Kh2 Qc2 hxg5+ Kg6
0.84 6 > +1.85 h4
0.99 6 +2.21 h4 g5 Rxe8 Qb1+ Kh2 gxh4 Rh8+ Kg5 e8=Q Qxe4
1.73 7 > +2.51 h4
2.04 7 > +3.01 h4
2.28 7 +3.24 h4 g5 Rxe8 Qxe4 Rh8+ Kg6 e8=Q+ Kf5
3.79 8 +3.31 h4 g5 Rxe8 Qb1+ Kh2 Qxe4 Rh8+ Kg6 e8=Q+ Kf5 Bf6
final 4.72 8. +3.31 h4 g5 Rxe8 Qb1+ Kh2 Qxe4 Rh8+ Kg6 e8=Q+ Kf5 Bf6
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