Author: Dave Gomboc
Date: 08:51:52 01/18/00
Go up one level in this thread
On January 18, 2000 at 11:45:37, Will Singleton wrote: >On January 18, 2000 at 08:49:48, Vincent Diepeveen wrote: > >>"R(mhz) rating/log(mhz)/100. Shows the performance of an account, >> taking into consideration the cpu speed." >> >>First of all Will is taking into account for his formula a logaritme, >>combines that with rating and computer Mhz. >> >>This assumes a logarithmic connection between Mhz of a machine and its >>rating. >> >>Obviously this is wrong. >> >>Let's take crafty: >> >>Wild 2148 [6] 195 50 8 253 2148 (06-Aug-1999) >>Bullet 3033 6241 1412 1018 8671 3191 (27-Oct-1999) >>Blitz 2858 48312 12919 8716 69947 3268 (27-Oct-1999) >>Standard 2550 3761 1496 1117 6374 2785 (08-Aug-1999) >> >>Machine = 4x400 = 1600Mhz >>rating = 2550 >> >>So this would make >> R(mhz) = 25.50 / log(1600) = 7.95 >> >>Now that sounds a bit low to me personal already. >> >>Let's now assume that Bob wants to top the green list: >> >> He needs 11.0 then as R(Mhz) to top it more or less. >> >>So 11.0 = rating / 100*log(1600) >> rating = 11 * 100 * log(1600) = 3525 >> >>So crafty needs an incredible rating of 3525 to top the greenlist. >>Good luck Bob! >> >>Why invent a formula if it's in advance already dead wrong? >> >>Rating is not based upon the 10th log of something. >>It SURE does not represent performance taking into account >>the machine speed. >> >> >>Vincent > > >Couple things. First, crafty's efficiency isn't 100%, I don't believe. I use a >figure like 75-80% when calculating the effect of multiple cpus, which is just >an approximation. But you're right, the formula seems to work better in a >narrow range. Have a better formula for me? > >But come on, Vincent, the whole list is just an approximation. Many folks feel >that ICC ratings have little real-world significance, due to the factors present >in server play. Again, the list is just for entertainment purposes, it doesn't >purport to be anything official. > >Having said that, on ICC one does see a general correlation between ratings and >perceived strength. > >Will Amusingly enough, one of the points considered in "The Rating of Chessplayers, Past and Present" by Elo is using a distribution based on log10 instead of the normal distribution, because the tails of the normal distribution are too low to match reality. Dave
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