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round-robin tournament
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tournament in which each contestant meets every other participant once (single round robin) or twice (double round robin)
~19 min read
Encyclopedic overview
Example of a round-robin tournament with 10 participants
A round-robin tournament or all-play-all tournament is a competition format in which each contestant meets every other participant, usually in turn. A round-robin contrasts with an elimination tournament, where participants are eliminated after a certain number of wins or losses, as well as with a Swiss-system tournament, where participants are matched according to their running score.
Excerpted from Wikipedia’s “round-robin tournament” article, available under the CC BY-SA 4.0 licence.