Author: Gerd Isenberg
Date: 13:14:11 12/10/03
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On December 10, 2003 at 15:38:43, Robert Hyatt wrote: >On December 10, 2003 at 12:54:13, Romang Jean-Francois wrote: > >>Hello, >> >>Is there a fast technique to detect that a king is in check in a bitboard engine >>? In my engine I generate all capture moves and try them to see if the king can >>be captured...but this seems very slow ! > >Do it backward. Find the king. Ask does a knight on this square attack >a square that contains a knight? If so that knight is checking the king. >Repeat for all your different piece types. > > >> >>I use check detection mainly in two parts of the engine : >>- During move generation to avoid generating illegal moves >>- To activate check extensions >> >>Is there a way to avoid check detection during move generation ? > >Don't do it. When you go to the next ply, and you capture a king there, >return a special score to the previous ply that says "that move was >illegal, unmake it and try something else." you really generate and even try all pseudo-legal moves if in check? > >> >>Thank you :) >>Jean-Francois
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