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Subject: Re: Hashtables and iterative deepening (question)

Author: Robert Hyatt

Date: 08:18:35 05/13/02

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On May 13, 2002 at 08:48:36, Vladimir Medvedev wrote:

>I'm going to implement hashtables in GreKo (they will be in ver. 0.42, now I'm
>testing their work).
>
>The question is, how to manage hashtables while iterative deepening is used?
>Now I clear hashtable on each iteration, because holding them unchanged since
>last iteration causes search instability. But I feel that I lose some useful
>


You lose a _lot_ of information this way.  Don't clear the hash tables at all
if you can avoid it.  And if you _do_ clear the stuff, it is best to just clear
the score field but not destroy the entry itself, since the "best move" is
still a good move to try...




information this way...
>
>Please, could anybody give me some information, weblinks or advice on this
>technique?
>In addition to http://www.seanet.com/~brucemo/topics/hashing.htm, which is the
>main knowledge source for me now?



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