I'd recommend switching to Microsoft's MuSigma more commonly know as TruSkill. Also it looks like Microsoft has been removing all references to MuSigma as the original name.
Wikipedia wrote:TrueSkill is patented,[3] and the name is trademarked, so therefore it is limited to Microsoft projects and commercial projects that obtain a license to use the algorithm.
But I've seen it used in assorted non-commercial projects (which nobody complained about the "elo" system) which I assume ent counts ask.