Author: Dieter Buerssner
Date: 16:22:15 05/31/05
Go up one level in this thread
On May 31, 2005 at 18:24:33, Richard Pijl wrote:
>I've been using the arasan testsuites quite a lot as they contain a nice mix of
>different type of positions. Today I was looking at a position that was always
>solved by the Baron in 30 seconds, but not anymore by the latest test version.
>I'm talking about the position with id Arasan.81:
>1B4k1/5p2/K5p1/7p/P4P2/5P2/8/6n1 b - -
>Bestmove is said to be f5, to block the bishop from stopping the black pawn on
>h5 from queening. This seems to be confirmed by many engines with about a draw
>score. But now, after an initial drawish score, the Baron shows a show of minus
>1 pawn in a second, quickly decreasing to - 3 pawns for f5, later switching to
>Nxf3 with a similar score. Somehow f5 doesn't seem to be that good.
Yace finds f5 fast, but later:
15480540 14.375 0.52 15. 1...f5 2.a5 h4 3.Kb6 h3 4.a6 h2 5.a7 h1=Q
6.a8=Q Qxf3 7.Qa2+ Kh7 8.Qf7+ Kh6 9.Be5 Ne2
10.Qc4 {70}
20803408 19.297 0.12 16-- 1...f5 2.Ba7 Nxf3 3.Bf2 Kf7 4.a5 Nd2 5.Kb7 Nc4
6.a6 Nd6+ 7.Kb6 Kf8 8.a7 Nc4+ 9.Kc5 Na5 {70}
21991391 20.391 0.00 16t 1...f5 2.Ba7 Nxf3 3.Bf2 h4 4.Bxh4 Nxh4 5.a5 Nf3
6.Kb7H Nd4H 7.a6H Nb5H 8.Kc6H Na7+H 9.Kb7H Nb5H
10.Kc6H Na7+H 11.Kb7H Nb5HR {340}
36075711 36.438 0.00 16. 1...f5 2.Ba7 Nxf3 3.Bf2 h4 4.Bxh4 Nxh4 5.a5 Nf3
6.Kb7 Nd4 7.a6 Nb5 8.Kc6 Na7+ 9.Kb7 Nb5 10.Kc6
Na7+ 11.Kb7 Nb5 {340}
42826451 43.438 -0.31 17t 1...f5 2.Ba7 Nxf3 3.Bf2 g5 4.a5 h4 5.Kb6 h3
6.Bg3 gxf4H 7.a6H fxg3H 8.a7H g2H 9.a8=Q+H Kg7H
10.Qb7+H Kf6H {-421}
72447094 1:19.5 -0.31 17. 1...f5 2.Ba7 Nxf3 3.Bf2 g5 4.a5 h4 5.Kb6 h3
6.Bg3 gxf4 7.a6 fxg3 8.a7 g2 9.a8=Q+ Kg7
10.Qb7+ Kf6 {-421}
87059959 1:35.0 -0.47 18t 1...f5 2.Ba7 Nxf3 3.Bf2 g5 4.a5 h4 5.fxg5 f4
6.Kb6 h3 7.a6 h2 8.a7 h1=Q 9.a8=Q+ Kg7 10.Bd4+
Kg6 11.Qd5 {-10}
133034210 2:27.3 -0.47 18. 1...f5 2.Ba7 Nxf3 3.Bf2 g5 4.a5 h4 5.fxg5 f4
6.Kb6 h3 7.a6 h2 8.a7 h1=Q 9.a8=Q+ Kg7 10.Bd4+
Kg6 11.Qd5 {-10}
151845579 2:45.5 -0.87 19-- 1...f5 2.Ba7 Nxf3 3.Bf2 g5 4.a5 h4 5.Kb6 h3
6.Bg3 h2 7.Bxh2 gxf4
186348870 3:19.0 -1.34 19t 1...f5 2.Ba7 Nxf3 3.Bf2 h4 4.Bxh4 g5 5.Bf2 Nd2
6.Kb7 Ne4 7.a5H Kf8H 8.a6H Nd6+H 9.Kc6H Nf7H
{HT} {-10}
237622632 4:23.4 -1.33 19t+ 1...Nxf3 2.a5 f5 3.Kb6 h4 4.a6 h3 5.a7 h2
6.a8=Q h1=Q 7.Be5+ Kf7 8.Bd4
278984309 5:09.8 -1.32 19t 1...Nxf3 2.a5 f5 3.Kb6 h4 4.a6H h3H 5.a7H h2H
6.a8=QH h1=QH 7.Be5+H Kf7H 8.Qb7+H Kf8H 9.Qa8+H
Ke7H 10.Qb7+H Kf8H 11.Qa8+H Ke7H 12.Qb7+H Kf8HR
{70}
357120192 6:36.4 -1.32 19. 1...Nxf3 2.a5 f5 3.Kb6 h4 4.a6 h3 5.a7 h2
6.a8=Q h1=Q 7.Be5+ Kf7 8.Qb7+ Kf8 9.Qa8+ Ke7
10.Qb7+ Kf8 11.Qa8+ Ke7 12.Qb7+ Kf8 {70}
496569100 9:23.5 -1.62 20t 1...Nxf3 2.a5 f5 3.Kb6 h4 4.a6 h3 5.a7 h2
6.a8=Q h1=Q 7.Be5+ Kf7 8.Qb7+ Kf8 9.Qg7+ Ke8
10.Qxg6+ Ke7 11.Qf6+ Ke8 12.Qe6+ Kf8 {HT} {-10}
679352876 12:30.2 -1.62 20. 1...Nxf3 2.a5 f5 3.Kb6 h4 4.a6 h3 5.a7 h2
6.a8=Q h1=Q 7.Be5+ Kf7 8.Qb7+ Kf8 9.Qg7+ Ke8
10.Qxg6+ Ke7 11.Qf6+ Ke8 12.Qe6+ Kf8 {HT} {-10}
See also http://chessprogramming.org/cccsearch/ccc.php?find_thread=352588
Cheers,
Dieter
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