Author: Derrick Wilson
Date: 02:27:12 07/28/00
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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. > >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. > >This is all pretty obvious to anyone who actually plays against >programs and thinks on every move. Even after a single serious >game against a new program you have a pretty good idea whether it >is stronger (against humans) than some older program you played >earlier. One can also notice this extraction efficiency by >thinking through or analyzing a game played between the two >programs. This is especially true if you also observe program's >output and evaluations from move to move. I assume you are a strong player? If so in your opinion which program is strongest against humans?
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