Author: Robert Hyatt
Date: 13:31:17 01/16/04
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On January 16, 2004 at 12:07:00, Tord Romstad wrote: >On January 16, 2004 at 10:02:39, Robert Hyatt wrote: > >>I would worry about overflow there. >> >>IE e4 could be attacked by pawns on d3 and f3, a bishop at d5 with a queen >>behind it (4 so far), plus two rooks and two knights. That's 8. It just >>overflowed to zero. Not to mention the promotion problems where there is a >>third knight or bishop or second queen... > >It is not so dangerous if you are just a bit careful about where and how >you use the information. I use it mostly in the evaluation function, in >order to compute stuff like mobility, space and king safety. That one >or two squares on the board are evaluated incorrectly once every hundred >nodes or so usually does not have any catastrophic consequences. > >You are of course right that an SEE based on this simple kind of attack >tables is not reliable enough to be used to replace a qsearch. For this >purpose, I use a much slower and more accurate SEE. > >Tord I was more worried about the actual overflow. IE if this is a char, 8 attackers appears to be zero. If it is packed into a word, then 8 attackers wraps into the next char to the left and corrupts that...
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