Author: Russell Reagan
Date: 00:10:32 08/22/04
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On August 20, 2004 at 14:27:22, Tord Romstad wrote: >>Without bitboards, the code looks roughly like this: >> >>if(pawn_race[(square of white pawn)-(square of black pawn)]) >> pawn can't run Did you mean to take the difference of two pawn squares? Bob's code detected whether a king could stop a pawn. Your code looks like it detects which passed pawn (white's or black's) promotes first. I'm also curious how yours works (regardless of what you meant), since it uses square differences (the 0x88 trick I assume?). Sometimes a pawn can move two squares. How do you account for that? Offset of 1 - White can promote [D]8/8/8/8/8/8/3Pk3/8 w - - 0 1 Offset of 1 - White can not promote [D]8/8/8/8/8/3Pk3/8/8 w - - 0 1 So you can't depend on the pawn-king offset, can you?
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