Author: Ernst A. Heinz
Date: 05:09:24 01/05/99
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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. Dear Leon, Thank you very much for allowing me to "feel free to add my comments" although I am not Bob Hyatt -- I did not know that such generosity still existed here. (Sorry for the sarcasm, yet I simply could not resist it when reading the title of your message.) The topic of your post is one of the oldest and most controversial questions in computer chess. Many researchers have written about it but, unfortunately, most of the published results are not statistically significant. Please down-load a preprint of my article "DarkThought Goes Deep" as published in the ICCA Journal 21(4) by anonymous FTP from <ftp://i41s10.ira.uka.de/pub/ernst/dt_deep.ps.gz> which contains an overview of previous work related to this subject in the first three sections. =Ernst=
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