Computer Chess Club Archives




Subject: Re: Nullmove: when to avoid it?

Author: Severi Salminen

Date: 03:44:58 03/01/01

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>There is another point, unrelated to hashing,
>which I forgot to mention in my original question.
>Since we are hoping for fail high, it seems to
>me obvious that nullmoves are also useless if
>beta = inf, where inf is the maximum value,
>used in the largest possible window. Perhaps this
>is so obvious that nobody mentions it?

Yep, that's true. As Bob said it is very rare to have beta=INF. Actually
Beta=INF can occur only in the very beginning of the search until we get our
first real score (score<=INF-Ply). Remember also that you don't have to know
anything else about the nullmove but whether its score is >=beta. So you can
search with (-beta,-beta+1)


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