Author: Ryan B.
Date: 13:40:27 12/13/05
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On December 13, 2005 at 15:51:41, Vincent Diepeveen wrote: >On December 13, 2005 at 14:35:27, Ryan B. wrote: > >>On December 13, 2005 at 08:35:07, Chrilly Donninger wrote: >> >>>On December 13, 2005 at 06:08:49, Ryan B. wrote: >>> >>> >>>> >>>>Does the standard version of Hydra use any foward purning other than Null move? >>>> >>>>Ryan >>>Everybody uses nowadays additional pruning. Otherwise the big search-depths >>>would not be possible. Hydra uses them too. But so far not History-Pruning. Did >>>not work with the other pruning techniques. >>>The kind of pruning is a secret. One big error - publishing NullMove - is >>>enough. But NullMove was anyway known in the community. >>> >>>Chrilly >> >>I suspected that most strong programs use additional pruning. I asked because I >>read a claim by Vincent that Deip and Zappa only use Nullmove for pruning. >> >>Ryan > >Diep world champs 2005 version used history pruning. Normally it runs without >pruning. dutch champs it used no pruning other than nullmove. > >Zappa uses only nullmove. The world champs version of zappa was just nullmove. >I'm not sure whether he's gonna use pruning in future, you'll have to ask >himself. > >Diep is not going to use history pruning *ever again*. Last plies pruning or >something else i might retry however. > >Did do a lot of tries there. Point is, when i play a 100 games or so and the >statistics indicate it scores me less points, then i kick out something. > >That happened to history pruning too. The tournaments we play, we play at quads >or something big, that means that testing a 100 games is not easy, as >in my case i simulate it with 180 0 games at a dual k7, each program its own >dual k7. > >Vincent Interesting, in my experience other than null move most pruning methods are only good at blitz time control or on slow hardware so I am not surprised that Diep only uses null move as I doubt you are interested in blitz results. One that I think is only a small improvement but helps at all time controls for me is extended razoring with researches when value is over alpha. A more complicated algorithm for doing researches may help but I have not found it yet. Ryan
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