River

River is a cloneproof monotonic Condorcet ambiguity resolution method with similarities to both Ranked Pairs and Cloneproof Schwartz Sequential Dropping, but when cycles exist, can in rare cases find a different winner than either of the other two methods.

It was first proposed by Jobst Heitzig on the election-methods mailing list: http://lists.electorama.com/pipermail/election-methods-electorama.com/2004-October/013971.html