Computer Chess Club Archives




Subject: Re: Returning PV from hash table

Author: David Rasmussen

Date: 16:25:57 01/15/03

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On January 15, 2003 at 19:11:43, Nathan Thom wrote:

>So, do you assume none of the entries have been overwritten, because at the end
>of a search you update the hash table again just to make sure the best move is

If you just probe the hash table to get the pv, sometimes entries will have been
overwritten, and you can't retrieve the full pv. But if you keep track of the pv
by other means (a classic pv array), you can store that in the hashtable at the
end of an iteration. You can still experience a hash hit when searching the pv.
If this happens, you wont have the full pv, you will miss the part after the
hash hit.


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