Author: Vine Smith
Date: 13:10:00 05/19/01
Go up one level in this thread
On May 19, 2001 at 11:03:49, Dieter Buerssner wrote:
>In the game Yace - Goldbar in Leiden, the following position was on the board:
>
>[D] 1r3rk1/p1q2pp1/3b3p/7Q/2b5/3NB2P/n1P2PP1/R3RBK1 w - -
>
>I think, this may be suitable as a test position. Yace here played Bxh6.
>What do other programs think?
>
>Regards,
>Dieter
>
>Yace on AMD K6-2 475, 30M hash:
>
> 4731871 32.256 0.33 9t 1.Qg4 f5 2.Qd4 Rf7 3.Be2 Bh2+ 4.Kf1 Bd6 5.Nc5
> Bxc5 6.Qxc5 {10}
> 10210373 1:09.6 0.34 9t+ 1.Bxh6 gxh6 2.Re4 Bxd3 3.cxd3 Bh2+ 4.Kh1 Qc4
> 12640730 1:27.3 0.66 9t 1.Bxh6 gxh6 2.Re4 Be6 3.Qxh6 Qc3 4.Rxe6 Qxa1
> 5.Qg5+ Qg7 6.Qxg7+ Kxg7H {HT} {-340}
> 13611852 1:33.3 0.66 9. 1.Bxh6 gxh6 2.Re4 Be6 3.Qxh6 Qc3 4.Rxe6 Qxa1
> 5.Qg5+ Qg7 6.Qxg7+ Kxg7 {HT} {-340}
> 48138295 5:21.8 0.86 10t 1.Bxh6 gxh6 2.Re4 Bh2+ 3.Kh1 Rb6 4.Qg4+ Rg6
> 5.Rxc4 Rxg4 6.Rxc7 Bxc7 {HT} {-420}
> 52663477 5:50.6 0.86 10. 1.Bxh6 gxh6 2.Re4 Bh2+ 3.Kh1 Rb6 4.Qg4+ Rg6
> 5.Rxc4 Rxg4 6.Rxc7 Bxc7 {HT} {-420}
I ran this past two Winboard programs in analysis mode on a Celeron 433 with
128M hash allocated in each case. Little Goliath 2000 v3 required 1 hour, 24
minutes to hit upon Bxh6, which was the 6th candidate in the 13th ply, initially
evaluated at +0.58. This rose to +1.27 when it finally finished evaluating this
candidate at 2 hours and 55 minutes (!), yielding the line 1.Bxh6 Rb5 2.Qg4 f5
3.Qg5 Ra8 4.Nf4 Bxf1 5.Ne6 Qe7.
Phalanx XXII on the other hand required only 3 minutes, 1 second to find Bxh6 in
the 8th ply, first evaluated at +0.14. At 3:56, the line was shown as 1.Bxh6 Rb5
2.Qg4 f5 3.Qg6 Rb6 4.Kh1 Nc3, eval +0.55.
Regards,
Vine Smith
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