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Subject: Re: transposition table question

Author: Robert Hyatt

Date: 10:32:19 07/09/02

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On July 09, 2002 at 12:09:42, Georg v. Zimmermann wrote:

>On July 09, 2002 at 11:55:23, Robert Hyatt wrote:
>
>>On July 09, 2002 at 11:18:05, Patrik wrote:
>>
>>>Is there any reason not to use transposition table in root node?
>>>Crafty does not use it in root node.
>>
>>
>>What would it give you?  IE you probe before you search.
>
>Yes, but I have info from the *last search* and that gives me a good estimate
>for the null window and a good move to search first. It also tells me how deep I
>have searched this position before so that I dont need to start the iterative
>deepening with depth 1.

This is not what he is asking.  He is asking about probing the hash table
at ply=1 specifically.  Not prior to starting a search of any kind.  Those
are two different issues.

I don't use the hash table to establish the PVS window, I simply compute it
after I complete an iteration just before I start the next iteration.  And I
know I don't want to start over at iteration 1 there, I want iteration N+1
since I just completed N.



>
>Greetings,
>
>Georg



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