Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: "ALL node" definition

Author: Tony Werten

Date: 07:30:26 02/23/03

Go up one level in this thread


On February 21, 2003 at 23:48:52, Robert Hyatt wrote:

>On February 21, 2003 at 13:26:34, Alvaro Jose Povoa Cardoso wrote:
>
>>Could someone please define what "ALL node" is and axplain how do we process
>>these type of nodes?
>>
>>Best regards,
>>Alvaro Cardoso
>
>If you look at a perfectly ordered alpha/beta tree, after you search the first
>branch at a node to establish alpha, you search the rest of the branches, and
>at each successor you search only one node (the refutation move).  But at the
>next ply below that you have to search _all_ moves.  This alternates down
>through the tree.  At "all" nodes, move ordering is totally irrelevant.  At
>successors to all nodes, you get "cut" nodes where you only need to search one
>move, if you can search a good move first...

If you're sure the other moves don't give a cutoff, why bother searching them at
all ?

Tony




This page took 0.04 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.