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Subject: Re: Singular extensions

Author: Don Dailey

Date: 09:34:26 01/08/98

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On January 08, 1998 at 11:48:22, Bas Hamstra wrote:

>On January 07, 1998 at 22:51:59, Robert Hyatt wrote:
>Bob, a while ago we had a short conversation about singular extensions.
>You said something like if a move is way better than the rest research
>that move till Depth+1.
>But what is the basic idea of singular extensions? Is it something like
>q-search but then not for captures but forcing moves? How could it lead
>to searching at greater depth *average* as was said of Deep Blue?
>Could you tell something more about this, about the general idea, not
>the implementation? (I'll be back for that later hopefully).
>Bas Hamstra.


Singular extensions is the concept of granting an extension if there
is only a SINGLE clearly best move.  "clearly best" is defined by
some positional margin for instance 1/2 pawn.  Determining singularity
is determined by a reduced depth search with zero window to prove or
disprove singularity.  There  are some implementation complications
you should be aware of too but this is the basic high level idea.

- Don

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