Author: Dann Corbit
Date: 15:13:51 12/06/03
Go up one level in this thread
On December 06, 2003 at 02:01:13, Matthias Gemuh wrote: >On December 05, 2003 at 20:06:57, Dann Corbit wrote: > >>>> >>>>Incheck(white) is just kingbitmap[white] & blackattacks >>>>Incheck(black) is just kingbitmap[black] & whiteattacks >>>> >>>>It's also useful for other things like move ordering. >>> >>> >>> >>>That is how I do it in BigLion. >>>I calculate these attack boards from scratch at each interior or leaf node. >>>Do you do it better ? >> >>You can do it incrementally. It's a lot trickier to get it right though. > > >I now calculate only AttacksFrom[64] and their sum. >To do things incrementally, I need also AttacksTo[64]. Right ? I think maybe that is better than what I do. Essentially, it is this: 1. Pick up the piece and remove all of its influence from the board. 2. Put the piece down on the target square and recalculate its influence. Sliders cause me a problem. If there is an enemy slider attack (on either the source or the target square) and I am not on an edge of the board, I have to recalculate a lot more. I think maybe your idea is a lot better.
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