Author: Andrew Dados
Date: 00:41:29 08/14/00
Go up one level in this thread
On August 13, 2000 at 16:47:33, Ed Schröder wrote: >On August 13, 2000 at 05:23:42, Colin Frayn wrote: > >>On August 13, 2000 at 05:17:29, Colin Frayn wrote: >> >>>Take this position for example; >>> >>>[D]4Q3/2p3p1/7p/p1k1B3/2p1P2P/2P3P1/1r2q3/6K1 w - - >>> >>>which ColChess searches *fully* to depth 13 ply in just over 3 seconds on my >>>p3-450. It is a mate in 9. Crafty sees the mate quite early because of its >>>advanced extensions, but after 30 seconds had still only just reached 11 ply in >>>its search. There are probably better examples where Crafty can't see the mate, >>>and I unfortunately can't remember the board setup before this position, which I >>>know to be one of them. >> >>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 > >There are other (cheap) ways. Rebel handles these cases in Q-search. > >00:00:00 04.00 Mate in 12 moves 1.Qf8+ Ke6 2.Qe8+ Kd6 3.Bxe5+ Kc5 > >Ed To be picky... my program says mate in 8.
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