Author: Uri Blass
Date: 02:11:13 12/21/04
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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. 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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