Author: Christophe Theron
Date: 11:13:43 11/23/00
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On November 23, 2000 at 09:42:08, Fernando Villegas wrote:
>In my last game with Rebel Tiger, when I had an advantage of .10 according to
>the program, I was in a hurry and so I offered a draw...that was accepted to my
>surprise. Too easy. Then I Looked at the advanced features and I saw there that
>draw score was at 0. That it means, I suppose, that RT will accept a draw just
>with an equal score. That's correct?
No it is not.
The "draw score" has nothing to do with accepting draw offers or not.
> If so, it is somewhat weird for a such
>powerfull program; as default setting, it should not accept draw with less than
>3 or 4 negatives points. I wonder why that was the selected value for that
>variable. Of course I changed it at once: now RT will accept a draw even if he
>is winning by 2.00 ... :-)
"Draw score" is a parameter that influences the evaluation of draws by
repetition or by the 50 moves rules.
If you set it to a positive value, say 100 (which is the value of a pawn, as the
unit in this box is the centipawn), Chess Tiger will evaluate a draw by
repetition or by 50 moves rule as an advantage of one pawn for him.
So you are saying to the program that it should try to reach a draw, because
that's a good thing.
With a value of 100 you are going to see the program stupidly trying to repeat
moves even in a balanced position.
Now if you set "draw score" to -100 (the value of a pawn, in negative), the
program is going to try hard to avoid draws, even in lost positions.
If the program has to play against a weaker player or program, I would suggest
to set "draw score" to a negative value in the range of -75 to -25.
If the program has to play an opponent of equal value, just leave the "draw
score" to the default value of 0.
If the program is going to play an opponent which is clearly stronger, then it
can be wise to set the "draw score" to a value of +25 to +75 (Tiger will try to
get a draw if the position is balanced).
Christophe
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