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Subject: Re: Static Exchange Evaluation (SEE) for pruning in quiescence (?)

Author: Bo Persson

Date: 00:10:25 08/19/03

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On August 19, 2003 at 02:48:36, Omid David Tabibi wrote:

>It seems that some programs use Static Exchange Evaluation in order to prune
>losing captures in quiescence search. In the following position, an SEE will
>deem the move 1.Rxd7 a losing capture, and it might get pruned in quiescence.
>However, in fact this is a winning capture since Qf6 is attacked after 1.Rxd7.
>How do such programs solve these kind of problems?

I guess they don't.

This is of course a horizon effect, which quiescence/SEE helps to reduce, but it
is not eliminated entirely. Pruning the qsearch is intended to make it faster,
so that you can spend more time in the full search.

You win some, you lose some. The trick is to win on average.


Bo Persson

>
[D]3r2k1/pppb2pp/5q2/5p2/3R1P2/2B5/PPP3PP/5RK1 w - - 0 1



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