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Subject: Re: One mate to solve...

Author: Heiner Marxen

Date: 14:36:18 04/22/01

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On April 22, 2001 at 09:57:10, leonid wrote:

>Hi!
>
>If you want to solve one mate and say your result, then this is the position:
>
>[D]2R2bNn/Rp1n1k1b/1q1ppB1p/1Np1p1p1/2P1P2P/3P2PB/4Q2K/8 w - -
>
>If you program says nodes/per/second, please indicate it for this position.

According to Chest this is a mate in 7 moves, with 3 solutions:

Bxe6+ Kxe6 Qg4+  Kf7  Qxd7+ Kg6  Qf5+  Kf7  Nxh6+ Bxh6 Rxb7+ =*=  Nxd6#
Qh5+  Bg6  Bxe6+ Kxe6 Qg4+  Bf5  Qxf5+ Kf7  Qh7+  Bg7  Qxg7+ Ke6  Re8#
Rxf8+ Kxf8 Ra8+  Nb8  Rxb8+ Kf7  Qh5+  Bg6  Qxh6  Qd8  Nxd6+ Kxg8 Qxh8#

On Athlon K7 600 MHz with 350MB hash: 950 seconds, 66,144 nodes/sec.

Just for fun I tried this one also with hash table disabled.  Timings:
depth     with  without
#  3      0.02     0.02
#  4      0.42     0.42
#  5      5.23     6.90
#  6     62.19   113.11
#  7    950.10  2285.93

Heiner



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