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Subject: Re: Enpassant in Nalimov

Author: Robert Hyatt

Date: 08:44:55 10/25/04

Go up one level in this thread

On October 25, 2004 at 11:27:30, Norm Pollock wrote:

>On October 25, 2004 at 11:20:32, Eugene Nalimov wrote:
>>On October 25, 2004 at 10:40:33, Norm Pollock wrote:
>>>On October 25, 2004 at 09:41:07, GuyHaworth wrote:
>>>>On October 25, 2004 at 09:02:14, Henry Hongdoyo wrote:
>>>>>Hello Joost,
>>>>>This is really my last question.
>>>>>Fen string : 7k/8/8/6Pp/8/8/8/K7 w - h6 0 1
>>>>>Nalimov give me wrong Distance To Mate because not
>>>>>consider Enpassant in h6. (should be 0)
>>>>>where can i add this condition ?
>>>>>i try to check enp variable; but it didn't work.
>>>>>what should i do to handle enpassant status in h6
>>>>I thought Eugene's EGTs included positions with e.p. options.
>>>>The problem may be in the interface to EN's EGTs.
>>>>For example, does not seem to pick up the e.p.
>>>>information from the FEN string.
>>>It is my understanding that e.p. is not covered in Nalimov tables, and is
>>>therefore a bug. The resulting problem is due to the fact that 5-man tables
>>>start being accessed with 12-14 pieces on the board (with my moderate speed
>>>machine, more pieces on the board with fast machines). The likelihood of ep with
>>>only 5 pieces is practically nil, but ep does occur with 12-14 pieces on the
>>Your understanding is wrong.
>I'm glad to hear that.
>There are 2 things about N-Tables I would like to know, especially because my
>moderate speed machine relies very heavily on them when it plays on playchess.
>One, is the afore-mentioned questioned about e.p. The other is how to determine
>the best size for the tb cache.

By testing.  The egtb cache and the operating system filesystem cache interact.
No real way to preduct the outcome without testing.

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