Author: Uri Blass
Date: 10:49:15 08/12/03
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On August 12, 2003 at 13:22:32, Brian Richardson wrote: >On August 12, 2003 at 12:03:15, Robert Hyatt wrote: > >>On August 12, 2003 at 06:23:26, macaroni wrote: >> >>>Hi, >>>in an alpha-beta search, with hash tables, null moving, history heuristic, >>>killers, pvs search, quiescent search, and itterative deepening. >>>about how many nodes would one expect after a 6 ply search from the opening >>>position, I get 13,000, is this way to many? or about right. >>>Also, about how much extra performance would one expect from killers? I seem to >>>get a really marginal increase, what replacement scheme is good for killers? >>>thanks. >> >> >>I get 42,000 as a reference. 13,000 may well be reasonable depending on how >>you extend in the search., > >This seems odd. I get only 1667 nodes with Crafty v19.3 >(and only slightly more with mt=1): > > >Crafty v19.3 (2 cpus) > >White(1): sd 6 >search depth set to 6. >White(1): noise 1 >noise level set to 1. >White(1): go > clearing hash tables > time surplus 0.00 time limit 22.50 (3:30) > depth time score variation (1) >starting thread 1 > 1 0.00 0.25 1. e4 > 1-> 0.00 0.25 1. e4 > 2 0.00 0.43 1. e4 e5 <HT> > 2-> 0.00 0.43 1. e4 e5 <HT> > 3 0.00 0.43 1. e4 e5 <HT> > 3-> 0.01 0.43 1. e4 e5 <HT> > 4 0.01 0.43 1. e4 e5 <HT> > 4-> 0.01 0.43 1. e4 e5 <HT> > 5 0.01 0.43 1. e4 e5 <HT> > 5-> 0.01 0.43 1. e4 e5 <HT> > 6 0.01 0.43 1. e4 e5 <HT> > 6-> 0.01 0.43 1. e4 e5 <HT> Constant pv of only 2 moves with HT means that it is obvious that your crafty learned from previous search and that your result is wrong. Uri
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