Author: James Robertson
Date: 11:43:10 10/25/99
Go up one level in this thread
On October 25, 1999 at 12:14:07, Peter Kappler wrote: >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 Yeah. Tactically, even _I_ can find the right move in 5 seconds. I won't see the mate in 500 though. :) James
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