Computer Chess Club Archives




Subject: Re: Hash table efficiency

Author: David Rasmussen

Date: 02:53:32 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 ...

Make sure you know what position he's talking about. The solution to the FINE70
position with the black king on A8 instead of A7 is Kb2. And I don't think that
the FEN was entirely clear...

On the other hand, I've had hashing bugs that made my program choose Kb2 in

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