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Subject: Re: testing of evaluation function

Author: Frank Phillips

Date: 05:07:41 04/18/03

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On April 17, 2003 at 21:58:47, Robert Hyatt wrote:

>On April 17, 2003 at 11:28:44, Steven Chu wrote:
>
>>I have an evaluation function in my chess program and need to be able to test
>>it.  I have been told to get some things to test it with and note down the
>>desired output and the actual output.  The thing is that I don't know how to go
>>about testing the evaluation function.  What sort of things do I use to test it
>>and how do I do it?
>>If anyone can help I will be very grateful
>>
>>Steven
>
>
>This is not "easy" but I have a piece of code that will suck in a FEN position
>and call Evaluate() and print the score.  I put a bunch of positions in a file,
>and run the "evtest" command.  I then look at the positions, one by one, noting
>Crafty's static evaluation.  If I disagree, I flag it to look at.  If not, I
>keep going.
>
>It is good to catch oddball cases that trigger unexpectedly large scores for
>the wrong reasons.


I also reverse the FEN of each position to check that the white and black score
is the same, which has identified a few bugs.



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