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Subject: Re: Chess program improvement project (copy at Winboard::Programming)

Author: Dann Corbit

Date: 21:31:45 03/06/06

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On March 07, 2006 at 00:27:43, Stuart Cracraft wrote:
[snip]
>Very interesting indeed. A clever test.
>
>If one's results do not rotate approximately as described
>for the four positions and you say the evaluation is an
>issue, what kinds of evaluation issues have you seen that
>could explain it?!?

The most common thing that I see is something that is good for white being
counted as positive for black also on the evaluation.  Often, when we are
writing the eval, we are thinking from the perspective of white. And so if we
are not very careful, we may invert the sign of some evaluation component and
count something that is good for white as something that is good for black (or
vice versa, though the reverse is seen less often for some reason).

There are, of course, many other possible causes besides that.



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