Author: GuyHaworth
Date: 06:28:38 01/30/04
Go up one level in this thread
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. A related question that I'm pondering at the moment: how many ELO are lost by halving the time available to the computer? g
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