Author: Stuart Cracraft
Date: 14:39:57 08/11/04
Go up one level in this thread
On August 09, 2004 at 16:02:38, Anthony Cozzie wrote: >On August 09, 2004 at 14:25:30, Stuart Cracraft wrote: > >>[D]r1bqkb1r/2pp1ppp/p1n2p2/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQ1RK1 b q - 4 1 >> >>I don't know if I filled in the castle flags right but in this position >>black still has both rights left. >> >>The question is, if your program values bishops more than knights, >>how do you prevent it from playing Na5 to capture the White Bishop >>but then giving up the pawn at e5 (since the capture Nxe4 by black >>is unplayable). (e.g. 1. ... Na5 2. Nxe5 Nxb3 3. ab) >> >>I've searched this to 10 full ply with unlimited quiescence >>and it still can't see that Na5 is bad. >> >>It would help if some people posted their searches and mention >>how they avoid this kind of issue. >> >>My search: >> >>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 >> >> >>Stuart > >Why don't you play Na5 Nxe5 and see what your engine thinks? > >anthony I went down that route before I posted. After Na5 and Nxe5 it is unable to recover the lost pawn after a number more moves (against me at least). So I want to prevent the whole thing, the original 1. ... Na5 in the first place. Stuart
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