Author: leonid
Date: 18:47:33 08/28/01
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On August 28, 2001 at 16:21:30, Angrim wrote: >On August 28, 2001 at 05:39:13, leonid wrote: > >>[D]6kq/rqqrqqqq/n2Q4/b1PNRBBN/b2Q3N/p2Q3K/n2P2Q1/q1Q2RR1 w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >Athlon 1.2ghz, pn^2 without pn-transpositions: >proved that move f5xh7 wins, 11 turns >PN2:1146353 evals, 31056 expands, 3.91 seconds > >Athlon 1.2ghz, pn^2 with pn-transpositions: >proved that move f5xh7 wins, 11 turns >PN2:952464 evals, 22224 expands, 3.36 seconds > >Athlon 1.2ghz, pn-search with transpositions: >proved that move f5xh7 wins, 11 turns >PN:261248 evals, 6348 expands, 24 max ply, 0.95 seconds Hi, Angrim! What is finally your time for solving this position? It look like it is very short but I am not certain what, between few figures that I see here, is final number. I tried to guess already few time if I have something in my solver like your pn-search but never had clear response. My time was very bad on this position. It took 11 seconds (your look to be 3.36 seconds) and selective find mate only in 10 moves. By brute force it took 12 min and 55 sec to find shortest mate in 8 moves. Celeron 600Mhz. No hash. I don't think that hash give that much help on selective search since there are only few nodes used on each ply. But hash should be very helpful on brute force. Cheers, Leonid. >pn-transpositions meaning that the search checks for transpositions in >the secondary pn-search as well as in the primary pn2 search. I >just recently implemented this for use in my suicide chess program, >but it seems to also pay off for standard chess. This costs a bit >of speed(nps) but seems to be well worth it. > >Also clearly raw pn-search is much(3x) better than pn^2 search, but >only if you have enough ram(pn-search is best-first search so all nodes >must be stored in ram) > >Angrim
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