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Subject: Re: piece values

Author: Vasik Rajlich

Date: 06:03:21 12/31/03

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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

Rybka uses Kaufman's values almost exactly. Only exception: 1/16th of a pawn
bonus for Q+N v Q+B with nothing else on the board. J. Watson also covers this
imbalance in his book "Secrets of Modern Chess Strategy" and claims that there
is no evidence to suggest that Q+N are better (Kaufman agrees), but I just can't
believe this.

One other thing I am starting to grow suspicious of is that BB v NN are not any
better than BB v BN. (As Kaufman claims)

Vas



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