Author: Omid David Tabibi
Date: 07:41:26 08/21/03
Go up one level in this thread
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" :)
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