Author: Stuart Cracraft
Date: 00:47:37 08/07/04
So here is an 8 ply search of the opening position without SEE: Alpha=-250 Beta=250 Maxdepth=8 MaxTime=9999999 1/ 2 e2e4 0.00 35 41 e2e4 2/ 4 e2e4 0.00 0 149 e2e4 e7e5 3/ 9 e2e4 0.01 17 450 e2e4 e7e5 f1c4 4/14 e2e4 0.02 0 2283 e2e4 e7e5 f1c4 f8c5 5/17 e2e4 0.06 17 7260 e2e4 e7e5 g1f3 b8c6 f1c4 6/23 e2e4 0.40 0 46344 e2e4 e7e5 g1f3 b8c6 f1c4 f8c5 7/26 e2e4 1.08 17 119943 e2e4 e7e5 g1f3 b8c6 f1c4 g8f6 b1c3 8/31 e2e4 6.11 0 699160 e2e4 e7e5 g1f3 b8c6 f1c4 g8f6 b1c3 f8c5 e2e4 6.11 0 699160 e2e4 e7e5 g1f3 b8c6 f1c4 g8f6 b1c3 f8c5 nps=114484 ha=17.00% q=57.0% bc=71% br=NaN% mp=108<>99 pawnx=0 recapx=0 qcheckx=27853 checkx=0 futilx=0 qfutilx=0 And with SEE: Alpha=-250 Beta=250 Maxdepth=8 MaxTime=9999999 1/ 2 e2e4 0.00 35 41 e2e4 2/ 4 e2e4 0.00 0 149 e2e4 e7e5 3/ 5 e2e4 0.00 17 439 e2e4 e7e5 f1c4 4/10 e2e4 0.02 0 2093 e2e4 e7e5 f1c4 f8c5 5/13 e2e4 0.05 17 6550 e2e4 e7e5 g1f3 b8c6 f1c4 6/20 e2e4 0.31 0 37096 e2e4 e7e5 g1f3 b8c6 f1c4 f8c5 7/24 e2e4 0.81 17 90371 e2e4 e7e5 g1f3 b8c6 f1c4 g8f6 b1c3 8/34 e2e4 6.48 4 740555 e2e4 g8f6 b1c3 e7e5 g1f3 b8c6 f1c4 f8c5 e2e4 6.48 4 740555 e2e4 g8f6 b1c3 e7e5 g1f3 b8c6 f1c4 f8c5 nps=114244 ha=35.00% q=50.0% bc=68% br=NaN% mp=105<>106 pawnx=0 recapx=0 qcheckx=9862 checkx=0 futilx=0 qfutilx=0 The result is worse (6.11 seconds vs. 6.48 seconds). This is true of a larger test of problem positions. The use of SEE was in the quiescence search only and involved rejecting any search of a capture whose SEE value to the to square of the capture was <0, otherwise the move would be made, legality tested, and if legal, then the recursive capture search performed (with the same see test.) Is this an abnormal result? What could explain it? I thought SEE was a shoe-in? Stuart
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