Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Singular extensions

Author: Robert Hyatt

Date: 17:00:31 01/08/98

Go up one level in this thread


On January 08, 1998 at 17:01:56, Bruce Moreland wrote:

>Could this be how Genius gets the answer to Wac 141 extremely quickly?
>
>bruce


could be.  I haven't talked with richard in a *long* time.  I do
remember
his letting slip that the only difference between two versions of Genius
was singular extensions, although I can't believe he was able to do both
the fail-high *and* PV extensions without taking too big a hit.  I seem
to remember that genius 2 was the program that started with these
things,
but I'm no longer certain.  It would certainly help with WAC 141.

BTW, on this subject, after fixing the check extension problem with the
hash table, I now get a fail high on Qxf4 in 25 seconds or so.  But I
have
let Crafty search for a *long* time and it can't get a score back.  Long
= > 10 minutes.  It gets into the 9 ply search and fails high on Qf4,
and
when I have peeked into the tree, it has found a mate, but it apparently
also follows *lots* of other mating lines as well.

Does anyone else get a real mate here in reasonable time?  I've been
checking
extensions and none seem to be "out of control"..  However, this has
been *the*
hard problem for Crafty for a couple of years, so at least it now finds
the
right move fairly quickly...



This page took 0.02 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.