Author: Kolss
Date: 08:52:47 04/13/05
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On April 13, 2005 at 09:27:48, William Penn wrote: >On April 13, 2005 at 01:10:27, Andrew Walker wrote: > >>I'm not sure if the calculations were done recently or not, however there's a >>nice >>piece on the 4 knights vs queen tablebase computed by Marc Bourzutschky at >>http://www.xs4all.nl/~timkr/chess2/diary.htm, including a white to mate in 85 >>moves and a mutual zugwang. Nice! >> >>Andrew > >It seems to me that until FIDE changes the laws of chess to allow endings longer >than 50 moves, it is pointless to extend the tablebases further. Even some of >the 4-5-6-men tablebases don't apply to a real game. If it takes more than 50 >moves without a capture or pawn move, then it's a draw according to FIDE. >WP Hi, I would rather say that the tablebases would need to be adjusted to the FIDE rules. If a program happens to reach a BB vs. N endgame with a mate in 77, but it is not possible to capture the knight within 50 moves, this position should have been scored as a draw. As far as I know, Dieter Buerssner (Yace) has generated such tablebases which comply with the official rules of the chess game. With those, I see no problem (in principle) in continuing to 6-, 7-, ...-man tablebases. IMHO, endgames like RR vs. RN are not very interesting from a practical viewpoint; they are (usually) drawn, and a good chess program should be able to draw them without tablebases against anyone and anything within the 50-moves-rule. Of course, a sequence of moves leading to a piece capture after 183 moves and a checkmate after 257 may be interesting from a purely academic perspective... Best regards - Munjong. P.S.: If I am well informed, all 4-man TB contain correct information with respect to FIDE rules, only starting from 5-man TB onwards, they are no longer "accurate".
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