Author: Stuart Cracraft
Date: 11:02:19 01/03/06
Go up one level in this thread
On January 03, 2006 at 12:18:58, Tord Romstad wrote: >On January 03, 2006 at 11:49:05, Robert Allgeuer wrote: > >>On January 03, 2006 at 10:49:54, Maurizio Monge wrote: >> >>>What you said is surely true. >>>But what i find strange is that, IIRC, the only quite new technic in computer >>>chess that can be found in fruit is history pruning, everything else is just a >> >>History pruning was already in use in SmarThink and other engines before as >>well. If I am not completely mistaken history pruning was invented by Sergej for >>SmarThink. > >It is possible that Sergei introduced the name "history pruning", but the >technique itself is very old; certainly much older than SmarThink. I no >longer remember where or when I heard about it for the first time, but it was >definitely not in this millennium. > >"History pruning" is a really bad name for the technique, by the way. Since >a long time, I have been advocating to rename it to "late move reductions". > >The word "history" is misleading because the technique can be implemented >without using history counters. I currently use a combination of null move >threat detection and evaluation data to make my late move reduction decisions, >and don't use history counters at all. This seems to work clearly better, >at least in my program. > >The word "pruning" is misleading because most people don't use the idea >to prune moves, but only to reduce the search depth. > >"Late move reductions" is a much more appropriate name, and does a better >job of explaining what the idea is about: Reducing the depth for the less >interesting moves late in the move list. > >Tord Tord - can you please give an example of a late move reduction using a move sequence or example so that we can all understand this? How did it do with your tests for suites and actual games? Estimate of ELO gain is ... ? Thanks, Stuart
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.