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Rex Nihilo & anyone else :) : i dont know much about ratings .. i just played games in which you gain experience points and skill levels (rpgs) ... which is seen as a rating in there, but which just depends on time :)
i have some feeling for maths though .. and i like any ratings and to work for them :)
would it be hard to implement other types of ratings as well ? and maybe display as a side note to the ratings which are used now ? (the lists dont even have to sort by them)