Computer Chess Club Archives




Subject: Re: Zero-width Window Null Move Search

Author: Robert Hyatt

Date: 11:34:35 06/15/98

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On June 15, 1998 at 10:53:49, Don Dailey wrote:

>I'm not convinced that this is the case.  Also it may not matter if
>99 selective nodes are zero width and 1 is not if that one takes
>significantly more  time to search.
>I do not know that you are wrong either, I'm just not sure.  When
>I made this change I definitely got a noticable speedup, not huge
>but enough to imply something was going on.
>If you make the change can you instrument this for us?  You could
>count the nodes that would be zero width and also count the non-zero
>width nodes and report them to us.
>- Don

I'm not totally convinced either.  As soon as Vincent ends his long match
vs Crafty on ICC, I'll make the change and run several positions and report
the differences..  if any...

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