Author: Uri Blass
Date: 06:43:39 01/30/04
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On January 30, 2004 at 09:28:38, GuyHaworth wrote: > >Several self-play experiments have been run with the two sides set to different >plies of 'basic search depth', a concept somewhat open to debate given that one >would not wish to prevent an engine chasing a line to stability if it wanted to. > >The most comprehensive experiment was by Ernst Heinz: his results have been >published in his book and (a later and larger experiment) in papers. > > >I re-analysed the 'significance' of the results because I believed that the >claim of 'diminishing returns' could be made with more statistical_confidence >than Ernst was attributing to the data. > >Ernst' exp went to 12 plies, not 16. There is a possibility that it is more >meaningful to compare a match of 12-11 games with a match of 10-9 games (i.e. a >whole move different) rather than comparing 12-11 with 11-10 and 11-10 with 10-9 >- because of the stm/sntm bias. > >From memory, I think the benefit was about 50 ELO (not plies) were ply at the 12 >level ... and decreasing. 50-70 elo is estimates that I read for doubling the speed(50 elo probably for slower time control). searching one ply deeper is more than doubling the speed so it is clearly more than 50 elo. > > >A related question that I'm pondering at the moment: how many ELO are lost by >halving the time available to the computer? > >g if you assume no pondering than it is about 50-70 elo. Uri
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