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Subject: Re: Hash table efficiency

Author: Robert Hyatt

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

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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 ...
>
>Mike.


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.



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