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Subject: Re: A question about tablebases and ep capture

Author: Uri Blass

Date: 10:08:08 03/10/02

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On March 10, 2002 at 12:01:21, Guido wrote:

>Some time ago I discussed on CCC about this subject with Bob Hyatt and he very
>kindly demonstrated to me that the right solution to this problem consisted in
>the duplication of the positions where a pawn can be ep-captured, so a good
>solution for this goal can be the use of the first (a1...h1) and the last rank
>(a8...h8) of the chessboard, where pawns are not normally allowed.
>
>For the moment in my program I preferred not to adopt this solution, generating
>tablebases without ep capture, so my present question is:
>
>Does someone know if exist positions in the following endings: KPKP, KXPKP (X =
>Q, R, B, N), KPPKP where results are different if ep capture is or not
>considered?

yes there are

[D]1K6/2p5/8/1P6/8/8/8/k7 b - - 0 1

c5 is a draw when white cannot reply bxc6

Uri



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