Author: Tim Foden
Date: 04:08:38 12/18/00
Hi All, I have recently been looking at lots of old posts (I've been mucking around with my own archive browser with better search functionality), and I keep coming across the FINE 70 position as a good test for a hash implementation. I have been worried about the hash code in GLC for a while now, but I haven't been able to track anything down that is wrong. I'm not sure there _is_ even anything wrong. But... on the FINE 70 position below, GLC takes ages to see the gain of the f5 pawn. So I am asking (grovel grovel) for people's help here... Looking at the analysis below, does it look like there is a bug, or is this just a normal posibility in a valid implementation? I am concerned for the number of nodes taked to finish 24 ply (after 2:21), and again at 26 ply (after 22:23; where it finally sees the pawn capture). If there is a bug, does anyone have a good idea how I should go about finding it? Or even a bad one? ;) Are there any other (simpler... where I can dump the tree an look at it myself) positions that also test the hash table in this way? Does GLC find the correct PV? If not, what is the correct PV for the solution to this position? Thanks in advance for any help... it will be much appreciated. Cheers, Tim. <<<<<<<<<<<< Program output below: >fen /k/3p/p2P1p/P2P1P///K/ w _a___b___c___d___e___f___g___h_ | | | | | | | | | White to play 8| | | | | | | | |8 |___|___|___|___|___|___|___|___| | | | | | | | | | 7|(K)| | | | | | | |7 |___|___|___|___|___|___|___|___| | | | | | | | | | 6| | | |(P)| | | | |6 |___|___|___|___|___|___|___|___| | | | | | | | | | 5|(P)| | | P | |(P)| | |5 |___|___|___|___|___|___|___|___| | | | | | | | | | 4| P | | | P | | P | | |4 |___|___|___|___|___|___|___|___| | | | | | | | | | 3| | | | | | | | |3 |___|___|___|___|___|___|___|___| | | | | | | | | | 2| | | | | | | | |2 |___|___|___|___|___|___|___|___| | | | | | | | | | 1| K | | | | | | | |1 |___|___|___|___|___|___|___|___| a b c d e f g h >hash 24 Hash table size set to: 24.0MB >anal Game stage: Endgame Current eval: 0.99 Ply Time Score Nodes Principal Variation 1 0.00 1.00 1 Kb1 1 0.01 1.05 4 Kb2 1 0.01 1.05 4 Kb2 2 0.01 0.99 12 Kb2 Kb6 2 0.01 0.99 18 Kb2 Kb6 3 0.01 1.05 47 Kb2 Kb6 Kc3 3 0.01 1.05 61 Kb2 Kb6 Kc3 4 0.01 1.05 108 Kb2 Kb6 Kc3 Kc7 4 0.01 1.05 130 Kb2 Kb6 Kc3 Kc7 5 0.01 1.06 232 Kb2 Kb6 Kc3 Kc7 Kd3 5 0.01 1.06 303 Kb2 Kb6 Kc3 Kc7 Kd3 6 0.01 1.05 453 Kb2 Kb6 Kc3 Kc7 Kd3 Kd7 6 0.01 1.05 514 Kb2 Kb6 Kc3 Kc7 Kd3 Kd7 7 0.01 1.05 761 Kb2 Kb6 Kc3 Kc7 Kd3 Kd7 Ke3 7 0.02 1.05 828 Kb2 Kb6 Kc3 Kc7 Kd3 Kd7 Ke3 8 0.02 1.06 1366 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 8 0.02 1.06 1427 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 9 0.02 1.06 1868 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Kc4 9 0.02 1.06 1929 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Kc4 10 0.03 1.05 3162 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 10 0.03 1.05 3225 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 11 0.03 1.05 4048 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd3 11 0.05 1.05 4109 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd3 12 0.06 1.05 5517 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd3 Ke7 12 0.06 1.05 5578 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd3 Ke7 13 0.07 1.05 7139 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Ke7 Kd3 13 0.07 1.05 7200 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Ke7 Kd3 14 0.08 1.05 9855 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kc7 Kd3 Kd7 14 0.09 1.05 9916 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kc7 Kd3 Kd7 15 0.11 1.05 13879 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kd7 Kd3 15 0.11 1.05 13940 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kd7 Kd3 16 0.15 1.05 23710 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kc7 Kd3 Kd7 16 0.16 1.05 23771 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kc7 Kd3 Kd7 17 0.24 1.05 39553 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kd7 Kb2 Kc7 Kc3 17 0.24 1.05 39614 Kb2 Kb6 Kc3 Kc7 Kc4 Kb6 Kd3 Kc7 Ke3 Kd7 Kd2 Kd8 Kc2 Kd7 Kb2 Kc7 Kc3 18 1.19 1.05 254909 Kb2 Ka8 Kc3 Kb7 <ht> 18 1.19 1.05 255124 Kb2 Ka8 Kc3 Kb7 <ht> 19 1.21 1.05 257733 Kb2 Ka8 Kc3 Kb7 Kc4 Kb6 Kd3 Kc7 Kc4 <ht> 19 5.50 1.06 1168840 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kb3 Kb6 Kc4 Ka6 Kd3 Kb7 Ke3 Kc7 Kd3 19 5.56 1.06 1181133 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kb3 Kb6 Kc4 Ka6 Kd3 Kb7 Ke3 Kc7 Kd3 20 7.51 1.05 1626804 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Ke7 20 8.77 1.05 1923353 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Ke7 21 9.22 1.05 2025144 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kd7 Kc4 21 9.23 1.05 2027301 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kd7 Kc4 22 9.26 1.05 2032028 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kc7 Kc4 Kd7 22 13.35 1.05 3011521 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kc7 Kc4 Kd7 23 13.40 1.05 3021288 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kf2 Kf7 Ke3 Ke7 Kd3 23 15.81 1.05 3530404 Kb1 Kb7 Kc1 Kb8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kf2 Kf7 Ke3 Ke7 Kd3 24 2:21 1.05 25881k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kc7 Kc4 Kd7 24 2:21 1.05 25895k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Ke2 Kd8 Kd3 Kc7 Kc4 Kd7 25 2:21 1.05 25908k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kf2 Kf7 Ke3 Ke7 Kd3 25 2:22 1.05 25930k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kf2 Kf7 Ke3 Ke7 Kd3 26 11:47 ++ 127200k Kb1 (a=0.55 b=1.55 e=1.55) 26 22:23 2.25 236793k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 26 22:23 2.25 236846k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 27 22:24 2.25 236874k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 Kxf5 27 22:24 2.25 236980k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 Kxf5 28 22:24 2.25 237025k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 Kxf5 Ke7 28 22:26 2.25 237290k Kb1 Kb7 Kc1 Kc7 Kd1 Kd8 Kc2 Kc8 Kd2 Kd7 Kc3 Kc7 Kd3 Kb7 Ke3 Kc7 Kf3 Kd7 Kg3 Ke7 Kh4 Kf6 Kh5 Ke7 Kg5 Kd7 Kxf5 Ke7 >exit local: t=23:03 nps=176410.9 n=244048445 (f=98419961 q=145628484) total: t=23:03 nps=176410.9 n=244048445 extensions: check=268605 recap=3 p-push=16306 1-rep=2 q-moves: gen=911422 tested=907591 made/un=785685 max-dep=4 max eval diff: part-1=0.98 part-2=0.57 >
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