Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Artificial Intelligence in Computer Chess

Author: Vasik Rajlich

Date: 02:19:30 04/01/04

Go up one level in this thread


On March 30, 2004 at 17:20:03, Jay Scott wrote:

>On March 29, 2004 at 19:03:22, Uri Blass wrote:
>
>>On March 29, 2004 at 18:52:52, Jay Scott wrote:
>>
>>>Chess programmers, I've found, are remarkably resistant to changing how they do
>>>certain traditional things. For example, every time I propose calibrating
>>>evaluation not in millipawns but by some standard with a sounder theoretical
>>>motivation, I'm shouted down by everyone who does not ignore me. I don't
>>>understand that.
>>
>>I do not know what you mean but if you mean to evaluation in terms of expected
>>result then
>>I am not against evaluation not by pawns but by expected result.
>
>Yes, that's an example.
>
>>The problem is that it is not easy for human to think about defining the
>>evaluation when it is in terms of expected result.
>
>Hmm, some humans, no doubt. Not the theoretically-minded, who are apparently a
>small minority.  But especially not when the evaluation is tuned by machine
>learning, or even by a human using formal methods (imagine a test suite that
>estimates how accurate each factor in the evaluator is). Then a sound
>theoretical basis behind it all can help us come up with methods that are more
>powerful. This is especially true when it comes to interactions between
>evaluation features.
>
>Most chess programmers, apparently, find it easier or more satisfying to eyeball
>their results and tune by the seat of the pants.
>
>  Jay

Hi,

I would love to hear something a little more concrete.

My own engine (Rybka) is too young to tune yet. I need to capture the right
terms first. You don't want to just tune for example a passed pawn weight -
first you need to discriminate the different types of passed pawns, then as a
last step you determine the weights.

However, I would be very curious to see which of my terms are doing anything.

I do some tests disabling various terms, to see the magnitude of the differences
in scores. However, this doesn't really say anything about how beneficial they
are.

Cheers,
Vas



This page took 0.03 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.