Computer Chess Club Archives




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

Author: Dave Gomboc

Date: 22:20:14 04/27/04

Go up one level in this thread

On April 27, 2004 at 20:26:41, Vincent Diepeveen 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.
>Never nullmove in pawn endgames of course. The reduction factor kills you there.
>I posted that already a 1000 times here.
>Any non-pawn endgame with a zugzwang double nullmove will find if you correctly
>implemented it.
>Most important feature of double nullmove is that you can use it detecting
>zugzwang without problems and still using nullmove.
>Many used to have rules like turning off nullmove when there is 1 piece left on
>the board. Now you simply can use nullmove there and therefore search deeper in
>the endgames before that.
>Plenty examples of zugzwang positions have been posted already.
>I'm not going to waste my time onto you, you just like agressive discussions.
>F you there.

That was totally uncalled for.


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