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

Author: Josť Carlos

Date: 15:46:33 04/27/04

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On April 27, 2004 at 18:42:03, Josť Carlos 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.
>>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
>  I recall this position from past discussions here. It's really interesting.
>Going one step further shows clearly a big hole in my search. In this position:
>[D]8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - -

  Sorry, I meant the position after Nxd5.

  Josť C.

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