Author: Carsten Kossendey
Date: 19:21:32 01/23/98
Go up one level in this thread
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...) > >How's it look to you? > >K2 1/18/98 0.20 >Type ? for help. >Transposition table: Entries=100K Size=6400K >Pawn transposition table: Entries=31K Size=3000K >? ? ? ? 30 seconds per problem. >fine70 >Kb1 > >white >. . . . . . . . >k . . . . . . . >. . . p . . . . >p . . P . p . . >P . . P . P . . >. . . . . . . . >. . . . . . . . >K . . . . . . . > >Phase = Endgame, Target search time = 30 sec, Root score = 146 [snip] >14. 0.4 146 14520 Kb2 Kb6 Kc3 Ka6 Kd3 Kb6 Kc4 Ka6 Kb3 Kb6 Kc2 > Kc7 Kc1 Kd7 Kd1 Ke7 Kc1 Kf6 Kc2 Ke7 Kd3 Kf7 > Kc4 Kf6 Kb5 Ke7 Kxa5 Kf6 Kb4 Ke7 3 questions: 1) Why do you get a 30 ply pv out of a 14 ply search with only king moves? (no checks etc.) 2) Why does your program think it can force the capture of the a pawn playing Kb2? (you can not) 3) Why, if you think you can force to capture that pawn, are you evaluating the terminal position of this PV as exactly equal to the root position? [snip] >19& 1.6 153 71780 Kb2 Kb6 Kc3 Kb7 Kd3 Kc7 Ke2 Kd7 Ke3 Kc7 Kf2 > Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 Kxf5 Kc7 > Ke4 Again a capture which cannot be forced, again no notable increase in evaluation. [snip] >My move is : Kb1 > >Time = 30.0 Rate=40322 Nodes=[1196402/14708/1211110] >Eval=177292 RptCnt=19091 NullCut=1704 >Extensions: Check=4512 Recapture=139 Pawn=0 PassedPawn=0 > OneMove=0 Threat=0 DeepSearch=0 Mate=0 >Material=[400/300] Worst=[46/-668] >Hash: Success=98% Collision=95% >Hash Counts: ReadHits=916615, ReadProbes=934112, WriteColl=485994, >WriteTries=50 >6524 >Pawn Hash: Success=99% Collision=0% >Pawn Counts: ReadHits=354171, ReadProbes=354517, WriteColl=0, >WriteTries=346 > >black >. . . . . . . . >k . . . . . . . >. . . p . . . . >p . . P . p . . >P . . P . P . . >. . . . . . . . >. . . . . . . . >. K . . . . . . > >+++ Kb1 Kb1 > >Correct so far: 1 Total problems: 1 Percent: 100% Congratulations, you solved the problem ;) >********* Grand totals ********** >Time = 30.0 Rate=40323 Nodes=[1196402/14708/1211110] >EvalCnt=177292 RptCnt=19091 NullCut=1704 >Extensions: Check=4512 Recapture=139 Pawn=0 PassedPawn=0 > OneMove=0 Threat=0 DeepSearch=0 Mate=0 >Hash: Success=98% Collision=95% >Pawn Hash: Success=99% Collision=0% >?
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