Computer Chess Club Archives




Subject: Re: Does your program understand castling/en passant rights on 3x repetition

Author: Mike S.

Date: 06:46:22 02/27/00

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On February 27, 2000 at 03:04:05, Tom Kerrigan wrote:

>I don't think exact adherence to these rules is necessary.

No? You may want to try this position with your computer:

Zepler # in 4 - [+1430.04e5e8]
Die Schwalbe, 1929

[D]r3k3/2Qp3R/1p6/1b2K3/4p3/8/5p2/8 w q - 0 1
1.Kd4 (threats 2.Qe5+ and 3.#) [1.Qd6? 0-0-0] 1...Ra4+ 2.Ke5 Ra8 3.Qd6 1-0

I was busy with this issue when a wrote a short article for CSS 4/1995. All the
programs I tested then, didn't apply the correct rule (Fritz 3, Rebel 6, W Chess
1, Genius 3 and Hiarcs 3). It was remarkable that the mistake happened in
problem mode also. CB's Mate 2.0-engines handles it correctly.
Btw., I'm sure programmers know the rule very well of course, but when it's
disregarded it is been done to gain more search speed I think. I have never
heard of any important, or not even unimportant, game where this would have
But if this would happen (incorrect claim of a draw, program refuses to
continue), I think there would be no special tournament rules for this and the
unavoidable anger, dispute and scandal would follow. Such things usually arise
in the most important game of a championship. I will be amused...


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