Author: Andrew Williams
Date: 11:35:22 06/21/99
Go up one level in this thread
On June 21, 1999 at 13:53:48, James Robertson wrote: >My program does check, recapture, and pawn push extensions, but I have heard >that many programs do a lot more. I think Gromit said he does something like 10 >different extensions? > >Could someone please tell me what different kinds of extensions are sometimes >used? It would be cool to try them out on my program. > >James I do the above plus null move mate threat (when the null move search returns a -MATE score, I extend by a ply). I also have a single response to check extension, if there's only one way of getting out of check - but I don't allow too many of these in one search. I've also recently tried re-searching with one ply extra if I'm about to take a beta cutoff, but my null move search suggested I would lose a Piece if I "passed". This doesn't seem to be doing any harm (which makes a change) so I'm leaving it in at the moment. I'm messing about a lot with my extensions at the moment (not very successfully), so I'd also be interested in what others do. Also, there was a message just after the Rebel-Rohde match where Ed Schroeder gave a few hints as to what he does - might be worth looking at that for some very interesting ideas. Andrew Williams
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.