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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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It's just math, you shouldn't need a library for that. And math either works or it doesn't. Not much to test there. – Mr. Beast Aug 23 '12 at 2:13
You might also want to take a look at Microsoft's TrueSkill rating system for comparison: research.microsoft.com/en-us/projects/trueskill – BerndBrot Aug 23 '12 at 9:08

closed as not constructive by Sean Middleditch, Byte56, bummzack, Mr. Beast, Josh Petrie Mar 22 at 15:14

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