Computer Chess Club Archives




Subject: Re: Hash table efficiency

Author: Robert Hyatt

Date: 07:31:39 12/06/00

Go up one level in this thread

On December 06, 2000 at 04:25:05, Michael Neish wrote:

>>Try this position:
>>/k/3p/p2P1p/P2P1P///K/ w
>>The solution is Kb1, and should take between 18 plies and maybe 21-22 plies
>>to find.  If you can't get to 18 instantly, your hashing is not working right.
>>For comparison, on a 550mhz single cpu machine, Crafty can reach depth 34 in
>>8.2 seconds...
>True enough, mine gets to ply 34 in around 8 seconds, but chooses Kb2!  Now
>there's an interesting phenomenon ...

You have a bug.  Kb2 is a draw.  it actually takes 26 plies to see that Kb1
wins a pawn, but with hashing, you should be able to see this a bit earlier.

This page took 0.05 seconds to execute

Last modified: Thu, 07 Jul 11 08:48:38 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.