Author: Andrew Williams
Date: 16:02:53 08/23/03
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On August 23, 2003 at 18:49:39, Sune Fischer wrote: >On August 23, 2003 at 18:19:11, Andrew Williams wrote: > >Hmm, maybe I wasn't clear, it's been a while since I looked at this stuff :) > >As an example: > >A rook moves from square "f" to square "t", and captures a knight on "t". >Vi find the rook's index and the knight's index and add them to the list: >affected = 1<<(ix_sq[f]) | 1<<(ix_sq[t]); >All sliders attacking f and t also needs updating (with some exceptions you can >figure): >affected |= sliders&(attack_sq[f]|attack_sq[t]) > >of course sliders here are (ix_pc[BISHOP]|ix_pc[ROOK]|ix_pc[QUEEN]) > >So now you know what pieces needs their attack boards updated, and you take one >piece of a time finding the bits that have changed and mask them out. > >Maybe it is better to use another squares table instead of indexes, I never >could decide on that. > >-S. Yes. I'm sure I'll get round to changing mine eventually to compare. Meantime, I've got a million other issues to sort out in PM... Andrew
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