Computer Chess Club Archives


Search

Terms

Messages

Subject: fractional extensions

Author: Alex Boby

Date: 11:13:54 06/23/99

Go up one level in this thread


On June 23, 1999 at 13:47:06, Robert Hyatt wrote:

>On June 23, 1999 at 09:35:09, William Bryant wrote:
>
>>As I understand the use of Singular extensions,
>>     when, after generating all the _legal_ moves, there is only one move to be
>>     made by the side on move, extend 1 ply.
>>
>
>
>
>this isn't a singular extensions...  this is a special case of singular
>extensions in general, and is most frequently called the "one reply to check
>extension."
>
>>Since you only extend a maximum of 1 ply at any node, if the King is in check,
>>     or any other extensions are also triggered you would be extending anyway
>>     and this only extends this branch of the tree when it is the only
>>     condition extending the search.
>
>
>Depends.  In Crafty, I extend 1 ply when I check the opponent.  Then, if he has
>only one legal move, he extends 3/4 ply for that reason...  still keeping the
>rule of "no more than one ply of extensions for every ply of search done."
>

   What exactly is the meaning of extending by 3/4 of a ply? Isn't 'depth' an
integer argument to the search?

Alex Boby



This page took 0 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.