Author: Volker Böhm
Date: 01:50:00 06/19/05
Go up one level in this thread
Hi, Reduction are one of the most compicated stuff in computer chess. A reduction that works well for one engine may not work for yours. I suggest the following: 1. Don´t do reductions if in a PV path in the search tree 2. Use the "far below alpha" reduction only in the last ply´s of the search tree (this is called futility, extended futility, razoring). Reduce if the color to move is far below alpha and cannot get near to alpha with the current move. The "far above beta case" should be done by nullmove 3. Select other reduction priciples at lower depth of the search tree, perhaps history pruning. (Reduce search depth of moves with a low historically measured probability to get above beta). Greetings Volker
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.