Author: Robert Hyatt
Date: 15:24:21 08/13/98
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On August 13, 1998 at 17:59:03, Jeff Anderson wrote: >I do not think that today a graph like that would be relevant. Some programs >sacrafice plies for a much more thorough evaluation. Other programs sacrafice a > thorough evaluation for speed. If you had a chart like this, a program that >searched slow would but evaluated well would do very well on a chart like that, >while a fast program that didn't have as complex evaluation would do poor. But >if you actually had a match between these two programs they two extremes would >probably even out. > two often-used measures, NPS and depth, are really only good for comparing A to A, ie the same program at a faster NPS or deeper depth. I believe that programs play better as they go faster, if the speed is gotten by either faster hardware or more efficient programming, rather than stripping something out or taking a "shortcut." I'd suspect that *everybody* agrees, because if you notice at every event where a computer plays another computer or a strong human, the computer operator makes every possible effort to get the fastest machine possible. But you can't compare NPS between two different programs and conclude anything about their "strength" based only on NPS. Ditto for "depth" because everyone has a different "meaning" for depth=10 plies, for example... > > >On August 13, 1998 at 06:12:37, Leon Stancliff wrote: > >> Can anyone tell me? >> >> A few years ago I saw a graph of ply level in the middle game versus >>anticipated rating. Has anyone attempted to do this same thing recently? We have >>estimates of the approximate rating increase per ply, and approximate rating >>increase with doubling of speed. >> >> Obviously selectivity, opening book and hashtables make a difference. But I >>feel certain someone has investigated the question I have proposed. What ply >>level was DeepBlue reaching in the Kasparov match? What ply level was Rebel 10 >>reaching in the longer games of the Anand match? >> >>Leon Stancliff
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