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Subject: Re: Hello from Edmonton (and on Temporal Differences)

Author: Sune Fischer

Date: 09:45:39 08/02/02

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On August 02, 2002 at 12:11:48, Rudolf Huber wrote:
>
>Any respectable result (>=25%) of TDLeaf would be a big surprise
>to me. In my experience, automatic learning methods quickly learn the
>simple things but have a hard time with the finer aspects of chess.
>
>So for me it is not really necessary to use a common search engine
>as a base to prove the point that the TDLeaf method has potential.

The problem is, that if you take a new engine that isn't very optimized to begin
with, you are not proving it can be done _better_ than hand tuning.
I think we can agree TDLeaf is better than nothing as the KnightCap project
showed, but would it work well enough to also improve on Crafty?

>And one should also note that hand tuning will profit from public
>source code which gives it a big advantage.

Hand tuning has it's limits. You can't adjust every weight to 1/100th pawn
accuracy, there are thusands of weights with non-linear relations.

Given the computerpower, I think it would be possible to do it better than a
human tuning.

For instance, do you have any idea what the right material values are?
Some use 1, 3, 3, 5.5, 9 and others 0.8, 3, 3.3, 6, 11 or what ever.
I think the *real* values are impossible to guess, it's probably something like:
1.08, 3.12, 3.35, 5,87, 10.64 or in other words - impossible to find without
machine tuning.

-S.

> Rudolf



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