Author: Angrim
Date: 03:40:23 08/13/00
Go up one level in this thread
On August 13, 2000 at 05:23:42, Colin Frayn wrote:
>
>OK I found the game. This is one position. Unfortunately Crafty again sees the
>mate using its impressive extension code, but ColChess manages to search 18 full
>ply *completely* plus seeing the mate immediately at 19 ply in 46.7 seconds.
>After this time, Crafty has just started searching the 13th ply. See how Faile
>does.
>
>[D]6Q1/2p3p1/5k1p/p3n3/2pBP2P/2P3P1/1r2q3/6K1 w - -
>
>Qf8+ is mate in 12.
>
>Cheers,
>Col
This is funny, I tried this on my program with not much hope of getting it,
and the initial proof number search found the win in 0.3 seconds.
Qf8+ Ke6 Qe8+ Kd6 Bxe5+ Kc5{forced} Bd4+ Kd6{forced} Qd8+ Ke6 Qd5+ Ke7{forced}
Bc5+ Ke8 Qe6+ Kd8{forced} Be7+ Ke8{forced} Bf6+ Kf8{forced} Qe7+ Kg8{forced}
Qxg7#
pn-search really likes to follow lines which include forced moves :)
Angrim
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