Computer Chess Club Archives




Subject: Re: Replacement shemes

Author: Russell Reagan

Date: 11:21:26 07/27/03

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On July 27, 2003 at 13:51:28, Sune Fischer wrote:

>I've been trying some different hash schemes, and the one
>that should be the best completely fails to solve a few positions.
>Currently I use two tables, one of the criterias is to replace if it is the
>same key (so I don't get the same key in both tables, same philosophy as with
>killers moves), but only if the depth is greater or equal.
>For some reason this fails on fine70 and similar positions.
>If I do always replace on top of _the same_ key, then it works fine!?
>I don't see the logic in that, and I'd really prefer to keep the deeper entry,
>Could this indicate a bug, or can it be explained/fixed?
>Currently I'm trying replace if LOWER bound (beta cut) or deeper, seems to work
>well also, I still don't get it though.

I recall Dr. Hyatt saying that the two tables scheme (depth preferred or node
preferred + always replace) is much better than a single, depth preferred table.
Don't remember why, or if he even stated why.

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