Author: Robert Hyatt
Date: 08:58:11 05/06/04
Go up one level in this thread
On May 06, 2004 at 11:38:44, Dan Honeycutt wrote: >Yet again I apologize for asking a question which I'm sure has been asked many >times before, but could someone explain the difference between a fail-hard and a >fail-soft and how does is affect a PVS search? > >I made the guess that, ie, if (score >= beta) if I return score it's a fail-hard >and if I return beta it's a fail-soft. It would seem that what I return doesn't >so much matter as what I put in the hash table. If I put in the (possibly) >higher value of score then I have a higher lower bound and a greater chance for >a hash cut if this position arises again. > >Thanks in advance. >Dan H. That is backward. But you have the right idea. Fail-hard never returns a value outside the initial alpha/beta window. Fail-soft does.
This page took 0.01 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.