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Subject: Re: Hashkey collisions (typical numbers)

Author: Vincent Diepeveen

Date: 08:24:27 04/07/04

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On April 07, 2004 at 11:19:21, Vincent Diepeveen wrote:

>On April 07, 2004 at 10:48:23, Renze Steenhuisen wrote:
>
>>
>>>>>>>I'm sure it was some implementation bug with Renze.
>>
>>Anyone,
>>
>>I only store result from the main search, so no NULL-move and no Qsearch
>>results.
>
>Of course i store nullmove and qsearch.
>
>Saves me at leat 50% (if % is a good term, because it will have of course an
>exponential effect in the long run).
>
>>I get a TT-hit ratio of 11.73%, of which a part will generate cut-offs.
>
>That's very high, i'm around 3-5%.

posted numbers from me are the chance that hashtable gives cutoff knowing a
position is in hashtable.

11.73% is very low, it will improve if you search deeper with more efficient
search.

>>    (I call something a tt-hit when an entry is found with the same hashkey,
>>     draft does not need to be sufficient)
>>
>>the tt_retrieve code retrieves a move, which I call the TT_MOVE_SUGGESTION.
>>
>>could someone provide me with a % of TT_MOVE_SUGGESTIONs in a search?
>
>They work very well.
>
>>Cheers...



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