Author: Gerd Isenberg
Date: 08:47:03 04/28/04
Go up one level in this thread
On April 28, 2004 at 07:41:36, Omid David Tabibi wrote: >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. > Wow, that's great. IIRC IsiChess needs some more time for the first one (~5 seconds). What about combining a reduced search, for Nullmove observation with detection of singularity and a kind of IID or even ETC? I guess there is still huge room to look for more improvements with Nullmove related stuff. Cheers, Gerd > > >> >>Cheers, >>Gerd
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.