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Subject: Wait, I see it.

Author: Bas Hamstra

Date: 04:49:44 01/15/03

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In think I understand now. You do it for the 2 rooks simulteneously. "Floodfill"
(not the correct term, I know) does not necessarily have to start at bit 0, it
can be anywhere. Wow. This really is an enhancement of the X ^ (X-2) trick. This
opens interesting possibilities, like generating "UP" attacks for all rooks and
queens at once, and masking only later (when it's needed) with a RookMask[Sq].

RookAttacks for one rook at a given square = RookMask[Sq] & UP & LEFT;

(plus the same for the reversed bitboard)

Bas.

• Re: Wait, I see it. Russell Reagan 10:58:25 01/15/03
  • Re: Wait, I see it. Bas Hamstra 13:05:32 01/15/03
    • Re: Wait, I see it. Bas Hamstra 13:20:04 01/15/03

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