Author: Uri Blass
Date: 14:58:16 08/23/03
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On August 23, 2003 at 17:29:11, Sune Fischer wrote: >On August 23, 2003 at 17:12:32, Uri Blass wrote: >> >>Note that I do not like a piece list of 32 squares because it means that even >>after having the attack information I cannot get the information if the square >>is attacked by a rook directly and I need to look at the squares of the >>attackers to see the type of the piece. > >There are max 32 pieces on the board, so you just do >if (ix_attack_sq[sq] & ix_pc[ROOK]) ... >that gives you a 32 bit piece list of rooks (black and white) attacking that >square. >If you want just white rooks: >if (ix_attack_sq[sq] & ix_pc[ROOK] & ix_co[WHITE]) .... >and so on. > >Very elegant and compact, the problem is the incremental update which is very >slow. > >>I like more attack information that give me directly the information if a square >>is attacked by a pawn,knight,bishop,... > >Can it get much faste than that? > >-S. I thought about something similiar to Ed's information bit[square]&3=number of white pawns that attack square (bit[square]&12)>>2= number of black pawns that attack the square Uri
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