Author: Uri Blass
Date: 17:14:58 09/17/05
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On September 17, 2005 at 19:58:02, Uri Blass wrote: Maybe there is some bug with fruit and it seems that fruit with no null move pruning and no history pruning prunes something and here is the proof: Fruit no null and no history before 6.Rhg1 <snipped> > >New game, >1r1b1r1k/1qp4p/3pn1RQ/2p2N2/p3b3/P4P2/1PP4P/2KN3R w - - 0 1 > >Analysis by Fruit 2.1: > >6.fxe4 Qxe4 7.Rhg1 Rxf5 8.Rxe6 > µ (-0.97) Depth: 1/10 00:00:00 >6.Rxe6 > ³ (-0.55) Depth: 1/10 00:00:00 >6.Rxe6 Bg5+ 7.Qxg5 Rxf5 > µ (-0.81) Depth: 2/16 00:00:00 >6.Rxe6 Bg5+ 7.Qxg5 Rxf5 > µ (-0.81) Depth: 3/16 00:00:00 >6.Rxe6 Bg5+ 7.Qxg5 Bxf5 8.Re3 > µ (-0.90) Depth: 4/16 00:00:00 >6.fxe4 Qxe4 7.Rf1 Rxf5 8.Rxe6 Qxe6 9.Qxe6 Rxf1 > ³ (-0.50) Depth: 4/19 00:00:00 >6.fxe4 Qxe4 7.Rf1 Rxf5 8.Rxe6 Qxe6 9.Qxe6 Bg5+ 10.Rf4 Rxf4 > µ (-0.83) Depth: 5/24 00:00:00 >6.Rxe6 Bg5+ 7.Qxg5 Rxf5 8.Qg4 Bxf3 9.Qxf5 Bxh1 > ³ (-0.46) Depth: 5/24 00:00:00 >6.Rxe6 Bg5+ 7.Qxg5 Rxf5 8.Qe3 Bxf3 9.Qc3+ Re5 10.Rxe5 Bxh1 > ³ (-0.56) Depth: 6/24 00:00:00 415kN >6.Rxe6 Bg5+ 7.Qxg5 Bxf5 8.Rg1 Rf7 9.Qe3 Bg6 10.Re8+ Rf8 11.Rxb8 Rxb8 > ³ (-0.26) Depth: 7/24 00:00:01 1011kN >6.Rxe6 Bg5+ 7.Qxg5 Bxf5 8.Rg1 Rf7 9.Qe3 Qd5 10.Qc3+ Qd4 11.Qxd4+ cxd4 > = (0.01) Depth: 8/28 00:00:03 3713kN >6.Rhg1 Bg5+ 7.R1xg5 Rxf5 8.Rg4 Rf4 9.fxe4 c4 10.Rg3 > = (0.02) Depth: 8/33 00:00:07 7041kN >6.Rhg1 Bg5+ 7.R1xg5 Bxf5 8.Rxe6 c6 9.Rf6 Qe7 10.Rfxf5 Rxf5 11.Rxf5 > +- (2.77) Depth: 9/33 00:00:16 15736kN > >(, 18.09.2005) After 6.Rhg1 Fruit no pruning is supposed to see 0.02 for white at depth 7 and 2.77 for white at depth 8. Surprisingly it is not the case and the score at depth 7 is signficantly higher. Fruit no history pruning and no null pruning: New game, 1r1b1r1k/1qp4p/3pn1RQ/2p2N2/p3b3/P4P2/1PP4P/2KN2R1 b - - 0 1 Analysis by Fruit 2.1: 6...Bxf5 7.Rxe6 -+ (-3.38) Depth: 1/5 00:00:00 6...Bxf3 -+ (-3.92) Depth: 1/5 00:00:00 6...Bxf3 7.Qxf8+ Nxf8 8.Rg8# +- (#2) Depth: 2/12 00:00:00 6...Bg5+ 7.R1xg5 Bxf5 8.Rxe6 Bxe6 9.Qxe6 Qxf3 -+ (-2.73) Depth: 2/12 00:00:00 6...Bg5+ 7.R1xg5 Bxf5 8.Rxe6 Bxe6 9.Qxe6 Qxf3 -+ (-2.73) Depth: 3/12 00:00:00 6...Bg5+ 7.R1xg5 Rxf5 8.Rxe6 Rxg5 9.Qxg5 Bxf3 µ (-1.05) Depth: 4/15 00:00:00 6...Bg5+ 7.R1xg5 Rxf5 8.Rxe6 Rxg5 9.Qxg5 Bxf3 10.Qf6+ Kg8 µ (-0.91) Depth: 5/18 00:00:00 6...Bg5+ 7.R1xg5 Rxf5 8.Rxe6 Rxg5 9.Qxg5 Bxf3 10.Qf6+ Kg8 11.Qg5+ Kf8 12.Qf6+ Kg8 = (0.00) Depth: 6/20 00:00:00 149kN 6...Bg5+ 7.R1xg5 Bxf5 8.Rxe6 Rf7 9.Rf6 Qd5 10.Rgxf5 +- (1.94) Depth: 7/25 00:00:00 721kN 6...Bg5+ 7.R1xg5 Bxf5 8.Rxe6 c6 9.Rf6 Qe7 10.Rfxf5 Rxf5 11.Rxf5 +- (2.77) Depth: 8/30 00:00:02 2352kN (, 18.09.2005) Maybe Fabien can explain it. Uri
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