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Subject: Re: Sacrifices of chess programs

Author: Mike S.

Date: 22:01:57 11/08/01

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On November 08, 2001 at 10:20:37, Uri Blass wrote:

>I define a real sacrifice of chess program as a move that is losing material
>based on only material evaluation but is played by the program because the
>positional score is bigger than a pawn.
>
>How many real sacrifice are played by programs?
>
>It may be interesting to get information about the average number of real
>sacrifice per game by different programs.

I think by now, "dynamical" sacs are not unusual anymore (for a king attack),
but positional sacs will still be very few. I wouldn't expect more than 0.0# per
game. Maybe that's too pessimistic, I haven't counted.

An very obvious positional sac is this test position which I like (from the
Nielsen rating test):

Nielsen - Ratingtest 1988
[Pos.Profil-08]

[D]1r1r2k1/2b1qp1p/b1p3p1/p1p1p3/2P1P3/1PN1BP2/P1Q3PP/R2R2K1 b - - 0 1

1...Rd4!

Doubled pawn goes, protected passer comes. Many programs find that.

Regards,
M.Scheidl



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