Author: blass uri
Date: 23:49:28 09/24/98
Go up one level in this thread
On September 24, 1998 at 11:43:38, Robert Hyatt wrote: >In the ICCA Journal, Vol. 16, No. 4, GM Timoshchenko is comparing various >chess programs on how they evaluate bishops vs knights. He gives several >positions, with this one being the most interesting at present: > > > +---+---+---+---+---+---+---+---+ > 8 | | | | | | | *K| | > +---+---+---+---+---+---+---+---+ > 7 | *P| *B| | | *B| *P| *P| | > +---+---+---+---+---+---+---+---+ > 6 | | | | | *P| | | *P| > +---+---+---+---+---+---+---+---+ > 5 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 4 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 3 | | | N | | P | N | | P | > +---+---+---+---+---+---+---+---+ > 2 | P | | | | | P | P | | > +---+---+---+---+---+---+---+---+ > 1 | | | | | | | K | | > +---+---+---+---+---+---+---+---+ > a b c d e f g h > > >fen: 6k/pb2bpp1/4p2p///2N1PN1P/P4PP/6K/ w - - > >Here is the gist... to feed this to a program and with no searching, >see how it evaluates this. Chessmaster 2100 says -.26, Fritz-2 says -.47, >and chess-genius 1.0 says -.48. I recently fixed two "holes" in Crafty's >evaluation, one concerning "if you have one bishop in the ending, get your >pawns on the *other* color squares" and the other "if in an endgame, with >pawns on both wings, a bishop is significantly better than a knight." > >This last influences the evaluation of the above position quite markedly, >because this is an endgame, and black is going to get the bishop-over- >knight in endgame bonus two times since black has two bishops, white has >none. Black also gets the traditional bishop-pair bonus as well, which >might or might not be overkill here. In any case, I first gave this to a >GM to look at and the response "black wins easily." Not surprising, the >bishop pair vs the pair of knights should favor the bishops. I do not agree that black wins easily. If black is fritz5 than black plays Bxf3 and has not pair of bishops. I do not think that pair of bishops wins easily In the game Boris Avruch against Junior4.9 the grandmaster had an advantage of pair of bishop and a pawn against bishop and knight and could not win(there were pawns in both sides of the board 4 against 3 in 1 side and 2 against 2 in the second side). I believe that if you asked the GM about the position he would say that the 2 bishops with a pawn wins easily bishop and knight Uri
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