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Subject: Re: Deep Search Extension

Author: Bruce Moreland

Date: 15:53:15 01/18/98

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On January 18, 1998 at 10:37:59, Robert Hyatt wrote:

>It is a form of the extension Bruce described for null-move mate threat
>extension.  The idea was to shift the null-move window downward, and
>then
>notice whether the null-move search fails high or low.  If it fails low,
>there is some sort of threat in the current position.  If it fails high,
>there is no threat.  If there is a threat, you extend by 1 ply.
>
>I tried it and found it was not effective at all.  It would solve some
>problem positions faster, to be sure, but it did not perform as well in
>regular games.  I discarded it two years ago.  I believe Bruce Moreland
>also tried it and chucked it...

No, my idea is a form of Donninger's thing rather than the other way
around.

A difference though is that I still use a zero-width window and I'm not
shifting anything anywhere.  Sometimes I get values out of the
alpha-beta window, and I count on this here, otherwise the thing
wouldn't work at all.

I tried it a long time ago and didn't like it.

The only place I've read about this recently is on the Dark Thought
page.  Are you guys still doing this, or am I confused?

bruce



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