Computer Chess Club Archives




Subject: Re: not using nullmove?

Author: Mike S.

Date: 09:28:26 02/13/04

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On February 13, 2004 at 11:07:02, Tord Romstad wrote:

>(...) That several of the top commercial
>programs do not use null move (at least not in the conventional way) is
>further evidence that it is possible to come up with something better.

Are you sure that there are top engines which don't use nullmove? Maybe they
"just" combine it with some zugzwang detection, or switch it off depending on
the amount of material earlier than other engines...

(I think the last engine not using nullmove which was among the top was Chess
Genius, but that was many years ago.)

I'm aware that some engines are not affected by the zugzwang/nullmove problem as
much as others are. - I'm only asking from the viewpoint of a user and fan, IOW.
no programmer: Is it ok to say, nowadays all top-10 (if not more) engines have
to have nullmove implemented in some way, because without they wouldn't be
competitive in terms of search speed?

(So far, I always assumed this is the case, interpreting what I read about that
then and when...)


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