Author: Peter Kappler
Date: 22:15:46 07/27/00
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On July 28, 2000 at 00:50:09, Ratko V Tomic wrote: >Well, you're unjust to Thorsten. The rating calculations >extract very little data from each game, about 1.58 bits >per game (i.e. log2(3)). On the other hand, each ply contains >about 5-6 bits of data, or for a 100 ply game you have 500 >bits of data produced. Hence the conventional rating tests >based on the 3-way game result are very highly inefficient, >they keep about 0.3 percent of info produced in game. Why 5-6 bits per ply? Just enough to represent an appoximate evaluation of the position? > >The advantage of ratings to the more efficient information >extractors (such as human brain) is that one can compute >such rating without even knowing how to play chess. Another >advantage is that they're not biased by human subjective judgment >(the ratings may manifest other biases which reduce their >predictive power, especially when extrapolating to a new opponent >from a small number of earlier opponents). A human chess player >likely extracts 100 times more info per game than the mechanical >rating calculator, and the stronger the player the more info he >can extract. > <snip> Well said. I have always felt this way, and seeing the idea explained so eloquently is comforting in a strange way. :) --Peter
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