Author: Tom Likens
Date: 06:30:03 12/31/03
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On December 31, 2003 at 07:54:37, Anthony Cozzie wrote: >On December 31, 2003 at 07:53:49, Anthony Cozzie wrote: > >>On December 30, 2003 at 22:04:02, Toni wrote: >> >>>I'm thinking about the values of pieces for a chess program. I have investigated >>>some engines and the values they give to pieces vary. Some examples are: >>> >>>ENGINE knight bishop rook queen >>>Faile 1.4.4 3.1 3.25 5 9 >>>Amy-0.8.4 3.5 3.5 5.5 11 >>>Crafty-19.4, 3 3 5 9 >>>Beowulf-2.2 3.2 3.25 5 9.3 (defult personality) >>> >>>I have to give values for my program and, as I'm not a strong chessplayer I >>>would like to know your opinion. Are these differences important? What values >>>should be assigned for the highest strength?. The same could be applied to score >>>bonuses, but the list is too large. :-) >>> >>>Thanks >>> >>>Toni >> >>Zappa: Knight/Bishop: 3.25 Rook: 5 Queen: 9.75 >> >>anthony > > >P.S. Do a search for Larry Kaufmann's article. These are the similar to the values used by Djinn (a pawn is 1). I let the position dictate wheter the bishop or knight is stronger. The only difference is I give the queen a value of 9.50. I set up an Excel spreadsheet comparing the values of various piece and pawn trades and set the values based on what I thought were good/bad trades. For example, R+4 pawns should be less than the value of a queen, R+P should be less than the value of two minor pieces, 3 minors > queen etc. It was interesting to see Kaufmann's values come out so close. regards, --tom
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