Author: Vincent Diepeveen
Date: 12:51:41 12/13/05
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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
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