Author: Ulrich Tuerke
Date: 13:19:05 12/22/04
Go up one level in this thread
On December 21, 2004 at 05:11:13, Uri Blass wrote: >On December 21, 2004 at 03:53:49, Joachim Rang wrote: > >>On December 20, 2004 at 16:32:24, Jouni Uski wrote: >> >>>Shredder 8 reaches quite stunning averaga search dept. E.g. with only 15 >>>second/move average with Pentium 2400 and 128MB hash it averages 15,2 ply! For >>>comparison Fritz Bilbao and Gandalf 6 reach both same 12,7 ply. No wonder >>>Shredder beats them 13 - 7 and 14 - 6. Of course 2,5 ply is a lot difference! >>>Is there any amateur or pro engine, which can equal Shredder in depth - Junior's >>>half plys can be forgotten. >>> >>>Jouni >> >>Here is a 1-minute search on my Athlon XP@1540 MHz, with Shredder 7.04 default >>and Fruit X with aggressive delta, futility and history pruning. Both engines >>were analysing together under Arena. Compare the depth! > >I am surprised to read that fruit2 has history pruning. >I understood that Fabien does not plan to implement history based pruning and >here is the source of my misunderstanding: > > >The reason is the following link: >http://f11.parsimony.net/forum16635/messages/68164.htm > >Fabien claimed in that link: > >"Forward pruning in the main search is a separate topic that I don't intend to >address now. If I ever do, I expect it will require years of work (same for a >proper move ordering)." > >Note that I consider history based pruning as forward pruning in the main >search. Doesn't the history heuristic simply mean that moves which had often produced cuts in the previous iteration will be tried as killers ? If this is true, then history pruning does only change move ordering; so it's clearly a backward pruning technique. Did I get this wrong ? Thx, Uli > >It did not take me years to implement it and I was surprised that Fabien claimed >that it will require years of work and maybe there is a misunderstanding about >the meaning of forward pruning. > >Uri
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