Computer Chess Club Archives




Subject: Re: Double Null move?

Author: Vincent Diepeveen

Date: 13:19:56 07/13/01

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On July 13, 2001 at 12:28:01, Steve Maughan wrote:

>I'm thinking of implementing double null move in my program.  Now as far as I
>know the most conventional way is to do the normal null move search and if there
>is a cutoff follow it with a normal search at reduced depth to confirm no
>zugwag.  However I do remember that someone here (Vincent?) outlined a different
>way of doing double null move.  Is there another way?  If there is, what are the
>pros and cons of each?

Confirming no zugzwang by doing a normal search with reduced depth
is very expensive if the reduction is not so many plies.

Double nullmove in fact reduces the search depth a lot before
you search in the same position.


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