Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Adjusting Alpha / Beta based on Hash table entry?!?

Author: Ulrich Tuerke

Date: 02:26:03 03/19/02

Go up one level in this thread


On March 19, 2002 at 04:34:28, Steve Maughan wrote:

>Ulrich & Tony
>
>>>This means your bestmove will "fail low", and not get recorded as bestmove.
>
>As Ulrich states this isn't really a problem as you just retirn 100 (in your
>example) and the PV stops at this node.  The issue that I think you may be
>alluding to is that when this move is then stored in the hash table there will
>not be a move associated with it as it's a fail low - but there will be from the
>previous search.
>
>I've played around with it and the result is that one sometimes gets annoyingly
>short PVs.  I still don't like the idea of lowering beta.  I'll tinker some
>more,

Hi,
my results with lowering beta aren't really convincing either, although I keep
on using it. In principle, it should save searching a few nodes (IMHO).

Uli
>
>Thanks,
>
>Steve



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.