Author: Sune Fischer
Date: 02:45:18 01/10/02
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On January 09, 2002 at 15:20:03, Robert Hyatt wrote: >>>I don't remember the positions, but Crafty once announced a mate in 103 on >>>ICC in a KNN vs KP ending, and Ferret beat that with a mate in 104 announcement >>>in the same kind of ending... >> >>I doubt if they can win against correct defence. >>The position may be drawn by the 50 move rule and a draw like this already >>happened in comp-comp games. >> >>Crafty should never announce mate in 103 based on existing tablebases and a >>score of mate in 103 should be translated to some material advantage based on >>the estimated probability to win. >> >>Uri > >Why? Just because some arbitrary rule says the game is a draw? Even if that >rule has been eliminated and then reinstated a few years later? mate in 104 >might be right again one day as fickle as FIDE is. :) The point is, that the programs shouldn't trust the tablebase score if the distance to mate is above 50, then the score should be draw and not a mate score. We always assume that the opponent will make the best possible defense, don't see why this should be any different. Exceptions: the distance to mate is 53 moves and the engine is playing a human, then it is probably okay to assume the human will "blunder" by playing slightly inaccurate, enough to mate within 50 moves. On the otherhand, if 99% of the mates in the tablebases are in less than 50 moves then it might not be worht checking? -S.
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