Computer Chess Club Archives




Subject: null move question(Fruit)

Author: Jan K.

Date: 17:50:14 07/22/04

Hi, i have seen in fruit and in other engines too that there is no test if
(remainingDepth-rFactor-1)>(=)0 before doing null move, only
remainingDepth>=someConstant, which means making many cutoffs based only on the
values given by qsearch. That gived a very nice speed up when I tried it, but I
soon found that my engine makes mistakes in some positions like this one, where
it shows a draw after <almost every move> <e6e2> <d3c4> <f7g6> <c4d3>, altough
only <d3c4> doesn't lose(normally seen at depth 5):
[D]8/5kpp/4rp2/2p5/PP1p4/3Q2PP/2P2q2/R1B4K w - - 3 30
it didn't help when I used verification search, checks in qsearch....
But Fruit doesn't seem to have a problem so do I have a bug or just miss
something? :))

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