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Subject: Re: Changing alpha / beta based upon hash?

Author: Steve Maughan

Date: 16:36:05 12/31/00

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Heiner,

>OTOH, a general assumption underlying all this searching business is
>that deeper searches generally produce better (more accurate) results.
>I.e. if we alrady have an even more correct result than the one the normal
>search would yield, we tend to to happily accept that, and we do expect
>to improve by this.  Right?

Yes.  This is why when one raises alpha one must also cut the PV.  What is
really happening is the deeper search info is being graphted onto the search.

>Of course you could restrict TT hits to only occur if the draft exactly
>matches the depth.  I suspect that would reduce the benefit from the TT
>in most cases, and quite drastically so in some cases (like the famous Fine >70).

Yes I'm sure there's scope for fiddling when Depth = Hash Depth.

>Do you really exclude TT entries with a larger draft?

I'm not sure what you mean.

I think I'm finally started to get my head rpound this issue - it's being vexing
me for days!!

Regards,

Steve



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