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Subject: Re: Formula for hash table size

Author: Bob Durrett

Date: 05:55:03 08/29/03

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On August 28, 2003 at 09:44:30, Gian-Carlo Pascutto wrote:

>On August 28, 2003 at 07:39:00, Buchmann Patrick wrote:
>
>>On August 28, 2003 at 05:10:10, Peter Fendrich wrote:
>>
>>>IIRC Chessbase/Fritz published a formula for minimum required hash table size in
>>>order to get optimal performance.
>>>
>>>Does anyone know where I can find it and/or other similar formulas for other
>>>engines?
>>>
>>>/Peter
>>
>>Hi Peter,
>>
>>This formula was published in a T-Note by Steve Lopez.
>>
>>You can find the article here:
>>http://www.chessbase.com/support/support.asp?pid=199
>
>I repeat: That formula _ONLY_ applies to Fritz 5.32.
>
>--
>GCP

Yes.  It was reported here earlier that different programmers utilize hash
tables in different ways.  You may recall that I had asked whether or not it
might make sense to standardize the way hash tables are used so that it might be
possible to use the table contents when switching engines [during analysis of a
game].  The idea was that the new engine could use information left behind by
the earlier engine.

Everybody here said that this kind of standardization would be impractical
because the way hash tables are used is an important part of the overall engine
design.  Different engine designers have different ways to use hash tables.

One must infer from this that the "correct formula" would depend on the way the
programmer sets up and uses his hash table.

Bob D.



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