Author: Uri Blass
Date: 13:27:13 12/22/04
Go up one level in this thread
On December 22, 2004 at 16:19:05, Ulrich Tuerke wrote: >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 ? No It means reducing depth of moves that almost always caused fail low based on statistics. Uri
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