Well-tested libraries for player ratings?

Posted by Lucky on Game Development See other posts from Game Development or by Lucky
Published on 2012-08-23T00:32:42Z Indexed on 2012/09/15 15:48 UTC
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It's common in games to implement some sort of numerical ranking system -- the ELO system is usually used in chess.

I could implement this system naively using Wikipedia's descriptions, but I suspect that this would open up a whole box of problems that have already been solved: rating inflation, etc -- for instance, the ELO system has a K constant that's 'fudged' according to rating, duration, pairings, statistics, ...

What are some libraries (I'm looking at Python, but anything is okay) that implements rating systems? It also doesn't have to be ELO.

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