Author: Robert Hyatt
Date: 20:55:45 01/03/99
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On January 03, 1999 at 21:18:11, Leon Stancliff wrote: >Bob Hyatt, > >I think you could probably answer this question if anyone can. Do you know how >the rating increases with ply depth. I have seen a figure of 200 points increase >per ply. I do not believe this would be a constant figure. My Hiarcs 6 will >normally reach 7 ply and sometimes 8 ply in the middle game. Do you have any >kind of graph showing what might be expected with each ply increase from 4, 5, >6, 7, 8 or 9 plies in the middle game. Does the increase in rating decrease as >one moves to higher levels? In other words, do you get as more increase as you >move from 7 to 8 than you do from 8 to 9. > >If anyone else has information on this topic please feel free to add your >comments. A very hard question. I believe that "dumb" programs get less from another ply than "smart" programs. At shallow depths, another ply helps _every_ program avoid/find tactics. At deeper depths, tactics fade out somewhat and if the program has little positional knowledge, it won't be able to get any- thing out of the extra plies. A smart program will continue to improve, however, as it simply finds deeper "plans" to use its positional knowledge. How you categorize the various programs would be fun however, as that would start a small war here. My best guess would be to simply take a common cpu and run all the programs. In general, the faster the NPS, the "dumber" the program, since the eval is the best place to pick up speed (IE in Crafty, I spend over 50% of my time in Evaluate() which is fairly high by today's standard. Although programs like Hiarcs are probably at 75% or so, while a program like Fritz is likely at 10% or less.)
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