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Subject: Re: Doesn't appear to work for me (full data)

Author: Gian-Carlo Pascutto

Date: 23:34:29 11/20/02

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On November 20, 2002 at 22:05:29, Robert Hyatt wrote:

>On November 20, 2002 at 16:55:41, Gian-Carlo Pascutto wrote:
>
>>Nullmove in Deep Sjeng uses an algorithm of my own, but I can
>>switch it back to other systems easily. I did so for running
>>a few tests.
>>
>>I made a version which uses Heinz Adaptive Nullmove Pruning
>>and a version which uses your verification nullmove.
>
>This would seem to be a bit harder than at first glance.  They say that
>if the normal null-move search fails high, then do a D-1 regular search
>to verify that, but while in that verification search, no further
>verification searches are done, meaning that the normal null-move search
>fail-high is treated just like we do it today..
>
>I'm going to experiment with this myself, just for fun, but it seems that you
>need to pass some sort of flag down thru the search calls indicating that
>you are either below a verification-search node or not so that recursive
>verification searches are not done...

Uh, considering psuedocode is given, this is a pretty braindead thing
to implement. Yes, you need to pass a flag down, as is illustrated in
his code.

The only tricky thing is the research on zugzwang, but I guess botching
that is not as critical if you run purely tactical tests?

--
GCP



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