Author: Uri Blass
Date: 01:47:47 01/10/03
Go up one level in this thread
On January 10, 2003 at 04:36:28, Richard Pijl wrote: >On January 09, 2003 at 16:51:32, Will Singleton wrote: > >>>If I force Qxa2 in the Baron, it takes (on a PII-500) about 8 minutes to show a >>>good score for white. Before that the score was drawish: >>> >>> ply time nodes score pv >>> >>> 13(21). 146 14006096 0 b1a1 a2b3 e1b1 b3c2 b1c1 c2b3 c1b1 <rep> >>> 14(23)+ 239 22183609 35 b1a1 a2b3 e1b1 b3c2 b1c1 c2d2 e2d2 f6g4 >>> 14(24)& 484 42965262 120 b1a1 a2b3 e1b1 b3c2 b1c1 c2c1 d2c1 f6g4 >>> 14(24). 638 55906104 120 b1a1 a2b3 e1b1 b3c2 b1c1 c2c1 d2c1 f6g4 >> >>Richard, >> >>You must have a problem here. 8 min is way too long. Perhaps a problem with >>repetition and hash. >> >>[D]r3r1k1/pbpp1pp1/1p3n1p/8/2PPp3/2P1P1P1/q2BQP1P/1R2RBK1 w - - >> >>Amateur shows +1.7 in 8 secs: >> >>8 -201 163 584342 c5 d6 cxd6 cxd6 Bg2 Ba6 Qd1 Bd3 >>9 -182 425 1508721 c5 Bc6 Ra1 Qe6 cxb6 cxb6 Bg2 d5 Ra6 >>9 0 433 1561526 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1 >>10 0 443 1660070 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1 >>11 0 479 1853613 Ra1 Qc2 Rc1 Qb3 Rb1 Qc2 Rc1 >>12 81 654 2681634 Ra1 Qc2 Rc1 Qb3 Be1 d5 c5 Kf8 >>13 177 819 3718292 Ra1 Qc2 Rc1 Qb3 Be1 Nd5 Rb1 Nxc3 Rxb3 Nxe2 Bxe2 Bc6 d5 Bb7 >>14 224 1161 5927341 Ra1 Qc2 Rc1 Qb3 Be1 Nd5 Rb1 Nxc3 Rxb3 Nxe2 Bxe2 d5 Ra3 dxc4 >>Rxa7 >> > >I'm not sure it's a bug. Repetition detection has been a problem some time ago >but I think I corrected that. Also the fact that it finds the draw in 2 seconds >supports that. To be sure I will check it again. > >Hash might be another cause. I'll try and check that as well. > >What worries me a little is that Amateur seems to need a lot less nodes to go to >iteration 13 than the Baron. Amateur needs 3.7M nodes, Baron 14M nodes. I think that the reason is that amateur failed high even before depth 13. When you fail high it is easy to go deeper. Uri
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