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Subject: Re: Nalimov 9 CD Tablebases

Author: Robert Hyatt

Date: 20:53:06 01/29/02

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On January 29, 2002 at 06:40:12, Albert Silver wrote:

>On January 29, 2002 at 04:31:39, Jeroen van Dorp wrote:
>
>>Convecta claims to ave them (complete) on 9 CD's. Are there still some missing
>>or so?
>>
>>
>>http://store.convekta.com/shop_model.asp?gid=121&sView=Catalog
>>
>>J.
>
>A few piece combinations were indeed removed as they took up space for no good
>reason. The combinations in question are King + 3 queens against King, King + 2
>queens + rook against King, etc. They represent no practical value to either the
>user or the engine and removing them saves from 1-2 Gb of HD space.
>
>                                  Albert


They do have _some_ merit.  If the engine probes after a capture takes it to
5 or less pieces, then you want to get a hit.  If you omit some tables, some
of the probes will fail, wasting time.  And causing extra search.  Yes a
program should win KQQQK or KRRRK or KBBBK or KNNNK, but it helps to know
_exactly_ how deep the mate is, to make the search as efficient as possible.



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