Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: what does "fail high" mean? In the context of iterative deepening/

Author: Russell Reagan

Date: 11:39:42 11/30/02

Go up one level in this thread


On November 30, 2002 at 12:17:29, scott farrell wrote:

>I think there are lot more and smarter ideas you can do playing around near root,
>aspiraton windows, time maangement, watching fail high, fail low, extending
>time, etc etc

As I understand it, a fail high means, "this move is good, but we don't know how
good" or "this move is at least as good as beta," right? And since you don't
know how good it is, you do the re-search to determine how good it is. Tell me
if I'm wrong.

Now, a fail low means (as I understand it, tell me if I'm wrong) that not only
one score fell below alpha, but that all scores for that node fell below alpha.
That means that there isn't a very good move from this node, right? So if every
score is a fail low at the current node, you can extend the time to search for
this move. Is that how you could use fail lows to your advantage?



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.