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Subject: Re: underpromotion

Author: Uri Blass

Date: 23:24:58 02/22/06

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On February 23, 2006 at 01:53:58, Gabor Szots wrote:

>I am just curious whether it is so extremely hard to implement underpromotions
>in a program. Vasik Propaganda Rajlich put up a poll at his site, allegedly in
>order to "Help us make the products that you want". The people here _want
>underpromotions_ but, although promised several times, Rybka is still incapable
>of it. Now is it really important for him what the masses want but the task is
>simply too hard?
>
>Gábor

The task is not too hard.
The main problem is implementing it in a way that is productive to playing
strength.

Movei searches underpromotions but it is possible that I can do it few elo
stronger by not considering them because underpromotions are rare in chess and
the program spend time on analyzing stupid lines with underpromotions.

It may be possible to solve the problem but I need to test if the solution is
really productive.

A possible solution may be underpromotion reduction but the problem is that in
that case underpromotion may fail high because of the horizon effect.

Uri



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