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

Author: Omid David Tabibi

Date: 04:41:36 04/28/04

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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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