Author: Stuart Cracraft
Date: 11:26:18 08/09/04
Go up one level in this thread
Sorry, the posted position was in error. It is: >[D]r1bqkb1r/2pp1ppp/p1n2n2/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQ1RK1 b q - 4 1 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
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