Author: Dann Corbit
Date: 17:42:06 12/21/05
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On December 21, 2005 at 20:34:15, Joseph Ciarrochi wrote: >Based on these posts, It seems like all the programs except rybka and fritz 9 >think that white has a strong advantage. (rybka at depth = 17 as +.48, which is >a typical white advantage, but not that strong). > >I think these non-rybka engines are getting it wrong....if you look at >(http://www.chesslab.com/PositionSearch.html), black and white are close to >even(33% white; 25% black) (granted based on only about 12 games). Dann, how >many games was your "57% for white" based on? 57% points, not wins. >Also, if you pit the engine against itself, there does not appear to be a >strong white advantage. i.e. white seems to only win about 50% ((i'll update >this after 40 or so games of different engines playing themselves) > >How much can we trust engines to evaluate opening variations? Not at all. Try this one (and let your engine think as long as you like): r1bqk1nr/pppp1ppp/2n5/b7/2BpP3/2P2N2/P4PPP/RNBQ1RK1 b kq - am dxc3; bm Nge7; In a gambit, the engines are often as blind as a bat. In a standard opening, they do very poorly. See Kurt Utzinger's NBE (No Book Experiment): http://www.utzingerk.com/nbe_2003_english.htm >best >Joseph > > > >On December 21, 2005 at 20:05:33, John Merlino wrote: > >>On December 21, 2005 at 19:03:43, Dann Corbit wrote: >> >>>On December 21, 2005 at 18:32:52, Dann Corbit wrote: >>> >>>>Which results in this position: >>>>[D]rnb1kb1r/pp2pppp/1qp2n2/8/3P4/2N2N2/PPPB1PPP/R2QKB1R w KQkq - 0 7 >>> >>>White gets 57/5% of the points, in my database (well above average). >>> >>>Preferred moves seem to be Bd3, Bc4, Na4 >>>I see Rb1 played occasionally in my database, but it looks inferior. >> >>CM9000's opening book ends at 6...Qb6. CM9_R1 on a P4-2.4 likes the position >>very much for White and says this: >> >>Time Depth Score Positions Moves >>0:00 1/6 1.39 39467 7.Bd3 c5 8.Bb5+ Nbd7 9.dxc5 Qxc5 >> 10.Be3 Qb4 >>0:00 1/6 1.40 42928 7.Na4 Qd8 8.Bd3 b5 9.Nc5 e5 10.O-O >> exd4 >>0:00 1/7 1.29 58085 7.Na4 Qc7 8.Bd3 Nbd7 9.O-O e5 10.Qe2 >> Bd6 >>0:01 1/8 1.19 122963 7.Na4 Qc7 8.Bd3 e6 9.O-O Bd6 10.Nc5 >> O-O 11.c4 >>0:02 1/8 1.46 266962 7.Bd3 Qxb2 8.Rb1 Qa3 9.O-O Nbd7 >> 10.Rb3 Qa5 11.Qe2 >>0:04 1/9 1.27 634459 7.Bd3 e6 8.O-O Be7 9.Rb1 O-O 10.Qe2 >> c5 11.d5 Bd6 >>0:11 1/10 1.44 1610449 7.Bd3 e6 8.O-O Be7 9.a4 O-O 10.a5 >> Qd8 11.Qe2 Nd5 >>0:29 1/11 1.24 4567995 7.Bd3 e6 8.O-O Bd6 9.a4 O-O 10.a5 >> Qc7 11.Qe2 Ng4 12.h3 Nf6 >>1:35 1/12 1.36 15184957 7.Bd3 e6 8.O-O Bd6 9.a4 O-O 10.Qe2 >> Nbd7 11.a5 Qd8 12.Ne4 Nxe4 13.Qxe4 >> >>jm
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