Author: Dan Honeycutt
Date: 12:12:16 03/16/04
Go up one level in this thread
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.
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