Instant-Round-Robin Voting
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Instant-Round-Robin Voting (IRRV) is a voting system which selects a single winner from ranked ballots and, if necessary, uses approval ballots as a tiebreaker. IRRV passes the Condorcet Criterion, and is by definition a Condorcet method.
IRRV is very similar to Condorcet//Approval methods, with the key difference being that it uses a separate Approval voting ballot for tiebreaking purposes.
IRRV is also sometimes used as a general term for Condorcet methods.
IRRV procedure
The procedure for calculating IRRV as conceived sometime before 2013 is probably lost with a mailing list that Toby Nixon started in 2005.