Author: Robert Hyatt
Date: 10:39:58 10/30/01
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On October 30, 2001 at 11:18:02, Dan Andersson wrote: >I have to agree that it is most often correct to assume that it is a draw. But >that was not my point. The point is that it is an inadmissible heuristic and you >did say that it was a draw or better for black. And that is just not true is it? >Christophe does/did something similar with the two knights (and a host of other >endgames), maybe you do to? But I restate that it is not a fact that KRBkrpp is >draw or win for black! And you actually did say that. Comments, or maybe a Mea >Culpa!? If I said it that way, it was accidental. What I had hoped to say was that "for Crafty, KRB vs KRanything" can't be won by the KRB side." IE that is the base assumption being hade here... The counter-example position given is so very unlikely to happen (both black pawns blockaded at f7/h7, black king can't get out of the "box", etc. I suspect that at least for _my_ program, that position can _never_ occur in a real game. Somewhere within the previous 5 moves one of those pawns would have been moved, or else the king would have left the box on f7... I hope I never called this a "fact" anyway. I usually call this a "heuristic" which means something that is right in the general case, but may have exceptions at times... IE I suspect that in the position given, the search is more than enough to find the direct win before the evaluation heuristic gets a chance to hide it... IE if you can win my rook, the heuristic doesn't apply. Ditto if you mate my king on the back rank... > >>In KRB vs KRPP the score will _never_ be positive. It will either be zero, >>if the pawns are not advanced very far, or less than zero if the black pawns >>are getting advanced enough to be a problem. >> >>But _never_ greater than zero since white has no chances. > >MvH Dan Andersson
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