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Subject: Re: Extensions and Futility Pruning

Author: Frank Schneider

Date: 23:18:11 05/04/99

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On May 04, 1999 at 20:51:00, James Robertson wrote:

>Whenever my program makes an extension, say, at depth = 4 it finds it is in
>check, it will not do any futility pruning/razoring for the rest of the branch.
>I recently read that some programs will do pruning/razoring even if there is an
>extension, unless it is at the current ply.
Gromit is one of those programs. It uses part-ply-extensions and has lots of
them, therefore there are extensions in many paths of the tree and switching
off futilitypruning after an extension would result in a much larger tree.

>Is this a better way to do things?
>It seems like it would nullify some of the effects of extending, but it could
>also save a tremendous amount of time too. What should I do?
Test what works better for you.
(I've never tried switching off pruning if an extension applied - I'll try
that sometime).

>Thanks for any help,


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