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Game Courier Ratings. Calculates ratings for players from Game Courier logs. Experimental.[All Comments] [Add Comment or Rating]Regarding Roberto's recent comments, let me mention that GCR does not work with the same paradigm as Elo. A player does not have a fixed GCR that eventually becomes too stable to change. Each time someone reloads this page, each player gets an initial rating of 1500, and his GCR is freshly recalculated on the basis of all available data. If he has previously held a very high rating but has started to do poorly, this may cause his rating to drop more before it is calculated nearly as high as it used to be. Furthermore, each GCR is based on all available data of everyone in the same playing network. Even if someone has previously attained a very high rating, it could drop as other players start to do better, even without him playing another game.