Author: Uri Blass
Date: 08:35:00 11/22/02
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On November 22, 2002 at 11:24:14, Dennis Breuker wrote: >On November 22, 2002 at 10:30:34, Robert Hyatt wrote: > >>On November 22, 2002 at 07:21:13, Uri Blass wrote: >> >>>What do you search after finding a mate? >>>Does genesis search for a shorter mate and in this case does it knows not to >>>search when it get ply that means that no shorter mate can be found? >>> >>>Movei simply stop searching after finishing an iteration with mate score. >>> >>>Uri >> >> >>I would suspect he does like most everyone else. Search until you reach depth >>2*N-1 where N is the mate depth as in mate in 9. I need to search 17 plies to >>verify that no shorter mate than mate in 9 exists... > >That's what I did as well. Until someone (was it Bas Hamstra, or >maybe Walter Ravenek?) told me that 2*(N-1)-1 plies (so 15 in this >case) is enough! If no mate is found within 15 plies then there is >no mate in 8, so the mate in 9 must be shortest! > >Dennis You assume no pruning and this assumption is usually wrong for chess programs. Uri
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