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Subject: Re: hanging pieces in rebel

Author: Tord Romstad

Date: 09:07:00 01/16/04

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On January 16, 2004 at 10:02:39, Robert Hyatt wrote:

>I would worry about overflow there.
>
>IE e4 could be attacked by pawns on d3 and f3, a bishop at d5 with a queen
>behind it (4 so far), plus two rooks and two knights.  That's 8.  It just
>overflowed to zero.  Not to mention the promotion problems where there is a
>third knight or bishop or second queen...

It is not so dangerous if you are just a bit careful about where and how
you use the information.  I use it mostly in the evaluation function, in
order to compute stuff like mobility, space and king safety.  That one
or two squares on the board are evaluated incorrectly once every hundred
nodes or so usually does not have any catastrophic consequences.

You are of course right that an SEE based on this simple kind of attack
tables is not reliable enough to be used to replace a qsearch.  For this
purpose, I use a much slower and more accurate SEE.

Tord




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