Author: Stuart Cracraft
Date: 11:25:30 08/09/04
[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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