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Subject: Re: Returning PV from hash table

Author: Robert Hyatt

Date: 21:55:45 01/16/03

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On January 16, 2003 at 19:48:23, Omid David Tabibi wrote:

>On January 15, 2003 at 23:40:00, Robert Hyatt wrote:
>>On January 15, 2003 at 18:38:38, Nathan Thom wrote:
>>>I just realised that my program LittleThought (in progress, hoping noone has yet
>>>used this name?) only stores the best move in the hash table, so when a hash hit
>>>occurs it cannot display the entire PV for that depth like everyone else's seems
>>>Do you all store the entire PV in the hash entry? or some other trick im
>>walk the hash table.  IE play the best move, then make it on the board, and
>>do a hash probe.  If you get a hit, see if you have a best move.  If so, that
>>is the second move, display it and make it.  Probe again.
>>The flaw is that every probe might not get a "hit" because that entry was
>>overwritten by something else, and the PV will end prematurely...
>What are the problems with the basic triangular pv array?

None.  That is what I use.  Some have trouble understanding it at first
and some want something that they think is more efficient.  Either can work
but the array approach (to me) is the simplest, easiest to understand, and
provides the most reliable PV.

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