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Subject: Re: underpromotion

Author: Dann Corbit

Date: 12:26:05 02/23/06

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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?

It's not hard, but it has a cost.

If you compute underpromotions, it will make your search and move generator
slower, since they will have to do more work.

So, if you implement it, it will take some effort to make your chess program
keep its efficiency.  Since underpromotions are rare in real games, the chances
are very good you will make your program a little bit weaker so that it can
solve some rarely occurring positions.



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