Author: Ed Schröder
Date: 13:47:33 08/13/00
Go up one level in this thread
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
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