Author: Jim Monaghan
Date: 09:06:35 08/09/02
Hi, Comparision of Ply Depth verses Rating Performance I understand this has been done before and probably much better. Anyway, I ran the IQ test as Bill suggested. Working with average ply depth instead of time, makes the table more universally applicable to different programs and hardware. Again there is nothing absolute about the rating numbers -- it's the differences that are important. By pumping it through Yace 0.99.56 at ascending ply depths I came up with the following table: Cel 1.3 Ghz/256 (32 MB HT) Ave Depth Found Percent IQ elo Rating Gain (Plys) (Total=360) (Max=2764) (Difference) 5 159 44.17 2094 -- 6 206 57.22 2251 157 7 241 66.94 2367 116 8 271 75.28 2467 100 9 288 80.00 2524 57 10 308 85.56 2591 67 11 315 87.50 2614 23 The tree really explodes at 12 ply on a lot of these positions and would take a huge amount of time. I would expect very little gain in performance anyway. Knowing (or assuming) that the relationship between ply depth and rating performance is a lograthmic function, I wonder if a mathematician here can extrapolate this table working with columns 1 and 5. Hopefully there is enough of a trend. The rating gain going from ply 8 to ply 9 is either a little low at 57, or the gain from ply 9 to ply 10 is a little high at 67, or both. The chart could perhaps step a little better, but I'm reporting it as directly as it came out. Maybe the table can be smoothed out for projection purposes. What would the expected gain be going from ply 11 to 12, ply 12 to ply 13, etc? Is there a ceiling? In a theoretical sense, I guess there isn't a ceiling -- but practically when you consider time spent to achieve higher plys, there might as well be. Interesting ... Cheers, Jim
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.