Computer Chess Club Archives




Subject: Re: When to do a null move search - an experiment

Author: Gerd Isenberg

Date: 12:06:29 04/27/04

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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.

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


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