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). > > >Regards, >Bas Hamstra. Bas, 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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