Author: Omid David Tabibi
Date: 04:41:36 04/28/04
Go up one level in this thread
On April 27, 2004 at 15:06:29, Gerd Isenberg wrote: >On April 27, 2004 at 03:33:26, Bas Hamstra wrote: > >>About double nullmove: I tested this in some pawnendgames to see if it could >>handle zuzwang problems, but I don't see it perform any better than normal >>nullmove. Can Vincent or you post a position where double null outperforms >>normal null? I agree the idea is elegant, but I just don't see it work. >> >>Bas. > > >Hi Bas, > >i don't use double nullmove, but a verification search with same R, if nullmove >fails high. Some of my favorite zugzwang positions: > >CTT4-11 Crafty-IsiChess: >[D] 8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - - ; bm Nxd5 >[D] 4KBkr/7p/6PP/4P3/8/3P1p2/8/8 w - - ; bm g7 Falcon using verified null-move pruning solves both positions in 1 second. > >Cheers, >Gerd
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