rankings not stable
Would you mind elaborating on "unstable ranking" definition?
I think there is only one new bot AgentSmith which is probably unsettled in ranking, but the were no new bots for months, so it should be ok otherwise.
Unfortunately, no one actively/constantly running rumbles. May be I should restart my clients...
Oh, I specifically mean that not all bots have faced each other. The LiteRumble rankings pages say so right at the top. (I think they're using the same definition as my archiving script...)