Author: Uri Blass
Date: 12:57:44 03/16/04
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On March 16, 2004 at 15:12:16, Dan Honeycutt wrote: >On March 16, 2004 at 14:21:55, Uri Blass wrote: > >>On March 16, 2004 at 13:29:02, Dan Honeycutt wrote: >> >>>On March 15, 2004 at 16:33:37, David Mitchell wrote: >>> >>>>On March 15, 2004 at 08:47:38, Andrew Wagner wrote: >>>> >>>>Some intelligence has been found useful however. Crafty is one example of this. >>>>When Crafty's king is in check, the move generator changes from pseudo-legal, to >>>>perfectly legal move generation, only. >>> >>>my move generation is patterned after Crafty and Pepito (except i do legal move >>>generation) so i'm pretty familiar with Crafty's move generation. to do legal >>>move generation you have to look at pins on the piece moving - which Crafty does >>>with the king in check. you also have to look at pins on the captured piece in >>>the case of an enpassant capture - if removal of the captured pawn will uncover >>>an attack on the king. i may be wrong, but i don't think Crafty does that. >>> >>>Dan H. >> >>I do not understand >>I did not learn the code of Crafty but I do not see an example when >>the king is under attack and the legality of enpassant capture is changed >>because of a pin that is not a pin of the pawn that is moving. >> >>Can you give a diagram when you think crafty does not generate all the legal >>moves when the king is in check? >> >>Uri > >I was thinking of something like: > r K > p P > b >Where PxP ep blocks the rook attack but uncovers an attack by the bishop. but >that makes no sense because the king would have been attacked by the bishop >before the pawn move. > >completely unrelated, how do you make those nice position diagrams that >everybody but me knows how to use? >Dan H. I simply post a fen and add [D] behind the fen. Uri
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