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

Author: Tord Romstad

Date: 01:12:45 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.

Not just some.  Almost all strong programs do this, I think.

>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?

They don't (or at least most don't).  On the other hand, the significant extra
speed gained
by not searching all captures help them find a lot of other tactics which they
otherwise
wouldn't have found.

Try it yourself.  I am almost certain that you will find that excluding losing
captures
from the qsearch is a big win.

Tord



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