Author: Guido
Date: 16:00:14 03/10/02
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On March 10, 2002 at 13:08:08, Uri Blass wrote: >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 This case IMHO is not an example as the Black wins in 23 moves with Kb7 or Ka7, but surely there are other positions, for example with 5 pieces, where Black has to move the pawn because black King is blocked by white King and the other white piece. Has someone tried to compare by a computer program two different set of tablebases with ep (Nalimov) and without ep (Edwards, Thompson ?) capture? In this case it would be very easy to obtain a list of all these positions. Ciao Guido
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