Computer Chess Club Archives




Subject: Re: Singular Extensions, Nullmove deepsearch

Author: Dave Gomboc

Date: 17:56:05 02/18/99

Go up one level in this thread

On February 16, 1999 at 04:45:43, Frank Schneider wrote:

>I experimented a little bit with nullmove deepsearch extensions and with
>singular extensions and now I have some questions:
>1. In all my tests the searchtree (#nodes to finish n iterations) increased
>   by a factor of 1.5 to 4. Although testresults were interesting I believe
>   this is too much. What are your experiences?
>2. Is it correct to assume that singular extensions work best if there are
>   only few other extension heuristics.
>3. How would you describe the difference between nullmove deepsearch extensions
>  (Donninger) and the nullmove threat detection by Deep Thought?
>4. Who uses
>   - singular extensions
>   - nullmove deepsearch extensions
>   - nullmove threat detection
>5. What is the best (easiest) way to implement singular extensions?
>Thanks in advance,

Okay, I know what "null-move" is, and what "singular extensions" are.  Now, what
is the difference between "nullmove deepsearch extensions" and "nullmove threat
detection", and which is the one that I know of as simply "null-move"?

I am also interested to know if implementing both singular extensions and
null-move together makes sense or not.  Are they complementary?  Or will they
interfere with each other and degrade search quality?

Dave Gomboc

This page took 0.03 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

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