Author: Peter Kappler
Date: 09:14:07 10/25/99
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On October 25, 1999 at 11:07:19, William Bryant wrote: >On October 24, 1999 at 23:45:47, James Robertson wrote: > >>On October 24, 1999 at 22:54:00, William Bryant wrote: >> >>>On October 24, 1999 at 12:55:22, James Robertson wrote: >>> >>>>r4q1k/p2bR1rp/2p2Q1N/5p2/5p2/2P5/PP3PPP/R5K1 w - - bm Rf7; id WAC008; >>>> >>>>My program has always solved WAC 8 easily. But last night I noticed the latest >>>>version chose Nf7+ instead of Rf7. I looked at the position with Crafty 16.18, >>>>and it gives mate in 7 after Rf7. After Nf7+, Crafty gives mate in 10 on ply 12, >>>>so this value may not be trustworthy. >>>> >>>>Can anyone look at the position and find out how far Nf7+ really is from mate? >>>> >>>>James >>> >>> >>>Jumping on this thread late, >>> >>>James, mate positions in the hash table can be tricky. My first problems were >>>with the program never choosing the shortest path to mate. Bruce is an advocate >>>of only storing bounds -not- distance to mate in the hash table. Bob, just the >>>opposite. >>> >>>If you were solving this before your latest 'change'. See if the change affects >>>your hash table and therefore starts leading you for a longer mate. >>> >>>William >>>wbryant@ix.netcom.com >> >>I generally test WAC with 5 seconds per position. On my P233, nobody finds this >>mate in that amount of time. :) >> >>James > >5s a positions. That can make it quite a test. > >I just tested the latest Screamer at 1 minute per position. >I am getting 264 positions in less than 10s (I will check to see how >log I took to see position number 8 -- but it was less than 10 seconds). >-284 positions is less than 30s >-287 positions in less than 60s > >Thats a majority in less than a minute -- much better than before. > >Now I'm curious about how long I took to find #8, the "No One" gauntlett >has been tossed :))))) When I get home I'll look this up and let you know. > >William >wbryant@ix.netcom.com I think he was talking about seeing the mate in <5 seconds, not just finding the right move. --Peter
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