Author: Frank Phillips
Date: 10:10:23 12/10/03
Go up one level in this thread
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 ! > >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 ? > >Thank you :) >Jean-Francois You can have a function that detects whether a particular square (eg the one the king is on) is attacked. If you have attack tables this is trivial (I think). Otherwise you can save time compared to your normal movegen routine by screening out quickly pieces that could not possibly attack the square eg because they are not on the diagonal, file, or rank that the square (king) is on - in the case of sliders. (knights and pawns are trivial with bitboards of course.). Frank
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.