Author: John Merlino
Date: 12:25:16 08/09/04
Go up one level in this thread
On August 09, 2004 at 15:07:05, Stuart Cracraft wrote: >[D]r1bqkb1r/2pp1ppp/p1n2n2/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQ1RK1 b q - 4 1 > >Finally after 11 full plies and 415M nodes, the program >changes its mind and plays Nxe4 which is better than Na5, >I think. I'm a very poor player so I don't really know tho. >The Na5 move looks like some kind of horizon issue. I am sure >that move ordering wouldn't help much as Na5 is already >lowly rated and is searched later so I think it is favoring >it for some other reason. > > >Alpha=-255 Beta=245 Maxdepth=99 MaxTime=9999999 > 1/11> c6a5 0.00 245 68 c6a5 > 1/11 f6e4 0.01 1026 159 f6e4 > 2/15 f6e4 0.01 1008 946 f6e4 f1e1 > 3/17< f6e4 0.02 758 4181 f6e4 d2d4 e5d4 > 3/20 f6e4 0.04 75 7143 f6e4 b3d5 e4f6 > 4/30 f6e4 0.13 75 24970 f6e4 b3d5 e4f6 d5c6 > 5/34 c6a5 0.50 57 104715 c6a5 f1e1 a5b3 a2b3 c8b7 > 6/34 c6a5 1.22 45 256985 c6a5 f1e1 a5b3 a2b3 c8b7 b1c3 > 7/42 c6a5 4.31 32 889215 c6a5 f3e5 a5b3 c2b3 f8d6 d2d4 f6e4 > 8/51 c6a5 24.86 19 5021946 c6a5 f3e5 a5b3 c2b3 d8e7 d2d4 d7d6 e5f3 > 9/54 c6a5 115.27 19 19483875 c6a5 f3e5 a5b3 c2b3 d8e7 d2d4 d7d6 e5f3 >10/54 c6a5 264.28 26 44999682 c6a5 f1e1 a5b3 a2b3 c8b7 d2d4 f6e4 b1d2 d7d5 >11/61 f6e4 2369.62 3 415693001 f6e4 f1e1 d7d5 d2d3 e4f6 f3e5 c6e5 d3d4 f8b4 According to the CM9000 database, Bb7 is the most commonly made move in this position. Bc5 is second and d6 are third. However, CM9_SKR also has trouble with this position, and will play Bd6? But, thankfully, this position is handled by the CM9000 opening book (which your engine should do as well). The book will play Bb7 or Bc5 3/7 of the time, and Be7 1/7 of the time. Be7 is an uncommon move, but a few top GMs have played it (Karpov, Adams, Sokolov, and Geller). jm
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