Computer Chess Club Archives




Subject: Extend or not extend in a nullmove tree

Author: Roland Pfister

Date: 00:03:37 06/08/98

Last week we discussed what to do and not do in a nullmove subtree.
My program Patzer used to not extend in such a branch. Bob argued
against it and it sounded ok to me.

At the weekend I tried both versions and the result is that if Patzer
doesn't extend it is a little bit faster, but not much. But in some
positions it sees the solution one iteration later!

So I changed my program to extend even in nullmove branches.
Thanks Bob.


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