Author: Sune Fischer
Date: 11:13:00 08/21/03
Go up one level in this thread
On August 21, 2003 at 10:41:26, Omid David Tabibi wrote: >On August 21, 2003 at 10:29:15, Omid David Tabibi wrote: > >>On August 21, 2003 at 10:10:54, Mihaly Szalai wrote: >> >>>[D]8/8/8/4p1p1/6N1/5p1p/5K2/7k w - - 0 1 >>> >>>All the programs I've tried see the mate >>>except Junior 7 and 8. They go to depth=63 >>>and score=0.00 in a few seconds then stop. >>>Why? One knight is not enough to mate? >> >>Interesting case. I guess when one side is left with a knight or a bishop, >>Junior sets beta = 0, i.e., that he cannot achieve more than a draw. It is a >>kind of tradeoff: in many positions this knowledge saves a lot of search (by >>pruning the tree), but in very rare examples like the above, it produces >>erroneous results. >> >>I believe that the risk is negligible in comparison to the considerable gain. >>However, as a matter of principle I'm against such "assumptions"... > >To quote Eric Bogosian in the movie 'Under Siege 2: Dark Territory': > >"Assumption is the mother of all f**k-ups" :) Then you can disable nullmove as well, that f**k ups as well some times. -S.
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