Swiss system vs round robin
Both keep everybody playing until the end. The difference is how many rounds you need — and how the pairings are decided.
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How a Swiss event works
In a Swiss event nobody is eliminated. Each round, players are paired against opponents on a similar score: winners meet winners, and the field sorts itself out over a few rounds.
The number of rounds is set by the field size — about log₂ of the number of players: 8 teams need 3 rounds, 16 need 4, 32 need 5. Everyone plays in every round, so the event finishes on time.
The numbers, for 8 and 16 teams
Eight teams: a Swiss event is 3 rounds of 4 matches — 12 matches in total. A single round robin for the same 8 teams is 28 matches over 7 rounds.
Sixteen teams: Swiss is 4 rounds of 8 matches, 32 matches in total; the round robin is 120 matches over 15 rounds. This is where Swiss becomes the only realistic option for a one-day event with a large field.
Which one to choose
Choose Swiss for large fields, limited time, and events where players expect to play every round: chess, esports, card games, and open tournaments where the field is unknown until the morning.
Choose a round robin when the field is small and the ranking must be complete — a four-team league where "everyone plays everyone" is the entire point — or when players need a fixed schedule they can plan travel around.
One honest caveat about Swiss: the pairings are computed from the results, so the next round can only be published once the previous round is complete. A round robin schedule, by contrast, is known before the first whistle.
Frequently asked questions
- How many rounds does a Swiss event need?
- About log₂ of the number of players: 3 rounds for 8 teams, 4 for 16, 5 for 32. BracketBee sets this automatically.
- What happens if two players on the same score have already met?
- The pairing avoids a rematch and drops one of them to the nearest opponent they have not played. Only a very small field can force a repeat pairing.
- Can I run Swiss with an odd number of players?
- Not in BracketBee: Swiss needs an even count between 4 and 32, because an odd field would leave one player without an opponent each round.