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I think GCR is an alternative good method, although it has its weaknesses, as ELO also has. Both are not very sensitive to drastic changes in a person´s game play, I know it is unusual, but not impossible. But I insist that weighted history must be considered, weighted history (for each game,I mean) can reflect some evolution in player´s game force, it is expected to happen in our site, because many of the games we play are new games, all of us are gaining experience with little theory as help, and results are less indicative in the first contacts with a game. GCR main weakness is that it does not reflect with the best accuracy the actual real force, but it tends toward an average over all the time.