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Subject: Re: Should I Hash at the Leaves?

Author: Ulrich Tuerke

Date: 02:10:19 02/25/99

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On February 25, 1999 at 00:35:29, Don Dailey wrote:

>On February 24, 1999 at 17:53:05, Larry Griffiths wrote:
>
>>
>>I have read a few chess papers about hashing.  The ones that I have read
>>recommend not hashing at the leaves of the tree, but I seem to get better
>>performance doing it this way. (At least in the opening and middlegame).
>>Am I missing something or is this recommendation from the stone ages?
>>
>>Larry   ~(:->
>
>Do what works best.  I hash 4 ply into the quies search but no farther.
>Why?  Because I ran a lot of timing tests and this was optimum.

Hashing in quiescence seems a little bit tricky to me. Imagine that you are
generating captures only but you get a non-capture move from the hash table
probe.
How do you handle this case, ignore this hit or make this move ?

Uli

>
>Your mileage may vary!
>
>- Don



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