Round-robin voting

It has been suggested that Tournament solution be merged into this article. (Discuss) Proposed since March 2024.

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Round-robin voting (also called paired/pairwise comparison or tournament voting) refers to a set of ranked voting systems that elect winners by comparing all candidates in a round-robin tournament. Every candidate is matched up against every other candidate, where their point total is equal to the number of votes they receive; the method then selects a winner based on the results of these paired matchups.

Round-robin methods are one of the four major categories of single-winner electoral methods, along with multi-stage methods (including instant-runoff voting and Baldwin's method), positional methods (including plurality and Borda), and graded methods (including score and STAR voting).

While most methods satisfying the Condorcet criterion are pairwise-counting methods, some are not. A handful of sequential-loser methods satisfy the Condorcet criterion, as do many Condorcet-hybrid methods.