Author: Robert Hyatt
Date: 13:17:44 01/23/98
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On January 23, 1998 at 15:00:17, Johanes Suhardjo wrote: >On January 23, 1998 at 13:01:15, Stuart Cracraft wrote: > >>On January 23, 1998 at 03:04:43, Bruce Moreland wrote: >> >>My litmus test for hashing has always been that if Fine 70 gets Kb1 in a >>second or so, you're probably OK, but if you stall out at around ply 18, >> you have something horrible going wrong. Fine 70: >> >>8/k/3p/p2P1p/P2P1P/16/K w - - 0 1 >> >>The key is Kb1 and you should see a score jump of around a pawn at some >>point, and if you get a PV you should eventually see a "Kxf5" in it >>somewhere. >> >>Okay, here is my output. Kb1 is found in a second. No stall at ply 18. >>Kxf5 appears at ply 19 and persists for a few plys but is not around at >>the higher plys (28, 29...) > > >Is there a minimum hash table size in order to pass this litmus test? >I tried my program (2^17 hash entries) and it got stuck at Kb3. I felt >horrible. Curious, I tried gnuchess-4.75 (default hash size) and it >also >stuck at Kb3. Then I tried crafty-11.13 and crafty-14.4, same results. >This is the output of crafty-14.4 after 35 plies: > > 35-> 4:13 3.20 Kb3 Ka6 Kc2 Kb6 Kd2 Kc7 Kd3 Kb6 Ke3 > Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Kf7 > Kg5 Kg7 Kxf5 Kf7 Kg5 Kg7 f5 Kf7 f6 > Kf8 Kf4 Ke8 Kg4 Kf8 Kg5 Ke8 Kg6 <HT> > > > Johanes Suhardjo (johanes@farida.cc.nd.edu) >-- >Brook's Law: > Adding manpower to a late software project makes it later you have the position wrong. The white king is at a1, so Kb3 is impossible here is the FEN again: /k/3p/p2P1p/P2P1P///K/ w
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