Author: Stuart Cracraft
Date: 17:41:54 01/09/98
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Win-at-Chess 141? About 3 1/2 minutes at 29k nodes per second. Total nodes was a little over 9 million. There were about 400,000 check extensions and 120,000 recapture extensions. Took a partial 7 ply search to see the move and a partial 8 ply search to see the mate. On January 08, 1998 at 20:00:31, Robert Hyatt wrote: >On January 08, 1998 at 17:01:56, Bruce Moreland wrote: > >>Could this be how Genius gets the answer to Wac 141 extremely quickly? >> >>bruce > > >could be. I haven't talked with richard in a *long* time. I do >remember >his letting slip that the only difference between two versions of Genius >was singular extensions, although I can't believe he was able to do both >the fail-high *and* PV extensions without taking too big a hit. I seem >to remember that genius 2 was the program that started with these >things, >but I'm no longer certain. It would certainly help with WAC 141. > >BTW, on this subject, after fixing the check extension problem with the >hash table, I now get a fail high on Qxf4 in 25 seconds or so. But I >have >let Crafty search for a *long* time and it can't get a score back. Long >= > 10 minutes. It gets into the 9 ply search and fails high on Qf4, >and >when I have peeked into the tree, it has found a mate, but it apparently >also follows *lots* of other mating lines as well. > >Does anyone else get a real mate here in reasonable time? I've been >checking >extensions and none seem to be "out of control".. However, this has >been *the* >hard problem for Crafty for a couple of years, so at least it now finds >the >right move fairly quickly...
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