Computer Chess Club Archives




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

Author: Sune Fischer

Date: 15:31:48 04/28/04

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>double nullmove:
>allowed: a3 null null d5 ...
>allowed: a3 null null d5 null null d4 ....
>allowed: a3 null d4 null null d5 ...

I gues the last one should have been

allowed: a3 null d4 null d5 ...

I think the rule is there must be an equal number of nullmoves.

In special cases the last one might theoreticly fail, ie. if the opponent can't
undo the zugzwang.
Say he is forced to capture or move a pawn for instance.

>That this eats more ply to solve some testset trick like a Bxe4 somewhere, bad
>luck there.

Why, because nullmoving misses a deep threat?


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