Author: Uri Blass
Date: 15:50:28 01/20/01
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On January 20, 2001 at 16:54:33, Vincent Diepeveen wrote: <snipped> >You are right about the e3 pawn. This is the ONLY reason why >it wins for black. See the evaluation for many programs of this position >without the pawn on e3 and you'll see they statically evaluate it as +2.0 >for black or something similar. I see that a lot of programs evaluate the position as close to 0.00 at small depth or even as slightly positive for white and not +2 for black. Crafty evaluated 2 pawns for a rook as almost +2 for black but Deep Fritz and Junior5.9 can see a small advantage for white and Rebel or Hiarcs can see something close to 0.00 score. <snipped> >What i find wrong are programs that solve this position positionally. >No evaluation takes into account the e3 pawn i'm 100% sure of that. >I don't do it in DIEP either. Because what if it's on e2 and someone >attacks e3? I think that the rule should be that if the white king does not have a legal move into the 3*4 rectangle than the pawns that are in the 6th are unstoppable. The 3*4 rectangle is b-e*1-3 when the black pawns are c,d and generalization is simple. <snipped> >There are zillions of possibilities, but a prog simply shouldn't >solve this without seeing it the pawns promote to a queen! If there are 2 pawns in the 7th when the king cannot capture one of them you can also say safely say that the pawns are winning by evaluation. Uri
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