Author: Robert Hyatt
Date: 12:55:25 08/04/98
Go up one level in this thread
On August 04, 1998 at 13:02:42, Amir Ban wrote: >On August 04, 1998 at 06:39:35, Robert Hyatt wrote: > >>On August 03, 1998 at 22:46:59, Amir Ban wrote: >> >>>On August 03, 1998 at 18:24:25, Komputer Korner wrote: >>> >>> >>>> >>>>We are getting hung up on the null move issue. Crafty uses null move but is >>>>still a full width program. CM 5000/5500 and Rebel 9 are selective searchers. >>>>Yes null move is a form of selectivity, but it is so common even among the full >>>>width programs that I discount it as a test of whether a program is selective or >>>>not. >>>>-- >>>>Komputer Korner >>> >>> >>>This is an exercise in circular logic. Your point is correct, because you assume >>>it is. There are no full-width searchers in existence, and if you grant the >>>title to null-movers like Fritz, then everyone is a full-width searcher. >>> >>>Amir >> >> >> >>there is one: Deep Blue, which doesn't use null-move. Cray Blitz is a close >>second with R=1, only one null allowed in any path, which means a one ply >>reduction max, no matter what... > >I rest my case ! As I said, there are no full-width searchers in existence. >Besides, after three decades of computer chess theory and practice, I don't know >why anyone would want to be one. > >Amir I'm not sure I follow, since Deep Blue still exists. The "full blown machine" is not available, but could be put back into service in a few hours, given a SP-2 Host to use. But the "Deep Blue Junior" box is alive and chugging along according to occasional reports from Hsu. And it is perhaps the only example left of non-null-move searching... Whether that is good or bad could be debated of course... but it does seem to work for them.
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