Re: So when is a Draw not a Draw???

Alexander Belov <[EMAIL PROTECTED]> wrote:

> "Sidney Cadot" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED]
>> Robert Hyatt wrote:
>> 
>> > Sidney Cadot <[EMAIL PROTECTED]> wrote:
>> > 
>> >>Mondo wrote:
>> > 
>> > 
>> >>>Yes it was a draw by three fold repetition.
>> > 
>> > 
>> >>The Rules of Chess mandate that a claim has to be made to this effect.
>> > 
>> > 
>> > Yes.  The "program" said "this is a 3-fold repetition."
>> 
>> What program: the GUI or the engine?

> The http://www.chessbase.com/newsdetail.asp?newsid=1335 story says:
> "The program Jonny had seen this and claimed the draw (while displaying a 0.00 
> score). But as Johannes Zwanzger later said on the Playchess.com server: "I did not 
> want to draw the game in this way against Stefan, just because his program has a 
> bug." So he had simply executed the move on the board, entered Shredder's reply and 
> continued with the game."

> So, if Jonny found 0.00 score in such dangerous situation (black led one pawn in 
> material,
> but as I understand it was is tactical troubles), it found three fold repetition - 
> not the GUI.
> Also Jonny realized that draw is the best score in this position (if it does not 
> contain a bug too).

> PS: GUI cannot find 0.00 score without engine, because engine can have its own way 
> of scoring draws.
> E.g. "irreconcilable" engine can score own forced draw as -0.1. Fortunately I don't 
> know such 
> crazy engines.


Crafty is one such engine.  IE if it is rated 2800 on a server, and
you are rated 1800, it will score a draw as -1.00, because it should
_never_ draw a player rated that low, it should play on because he
will almost certainly make a tactical/positional error that will
lose the draw.



-- 
Robert M. Hyatt, Ph.D.          Computer and Information Sciences
[EMAIL PROTECTED]                   University of Alabama at Birmingham
(205) 934-2213                  136A Campbell Hall
(205) 934-5473 FAX              Birmingham, AL 35294-1170