Dear Richard,
suppose d[X,Y] is the number of voters who strictly prefer
candidate X to candidate Y.
I suggest the following criterion ("Independence from
Nonsupporting Pareto-Dominated Alternatives"; INPDA):
Adding candidate Z with d[A,Z] > 0 and d[Z,A] = 0
must not change candidate A from a winner to a loser.
Tideman's ranked pairs method violates this criterion while
my beatpath method satisfies this criterion. Hehehe.
Markus Schulze
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