Author: leonid
Date: 05:31:11 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 Tried by curiosity this position. My mate solver (llchess) can't do nothing instantly. Using AMD 400, brute force search say, after 37 seconds, that mate in 8 moves do not existe. It find by selective search mate in 9 moves in 1.5 seconds. It take for him long 5 min 36 sec. to find the same mate by brute force. >>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. Searched and found mate by selective search in 7 seconds. Tried to find it by brute force. After waiting for 2 minites understood that it is not for very soon. Mate in 12 is very rare position, ideal for collection. It can be solved very often (when solution existe) after long hours of search. Leonid. >Cheers, >Col
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