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Single vs double elimination

Both are knockout formats, but they treat a loss very differently. Here is how each works and how to pick the right one for your event.

Single elimination

In single elimination, one loss ends a team's run. With n teams the champion is decided in roughly n − 1 matches, which makes it the fastest format to run. It's ideal when you have limited time, many participants, or a single day to crown a winner.

The trade-off: a strong team can be knocked out by one bad game or an unlucky early draw.

Double elimination

Double elimination adds a losers bracket. Lose in the main (winners) bracket and you drop down rather than out; a second loss eliminates you. The winners-bracket champion meets the losers-bracket champion in a grand final. Because the winners-bracket finalist hasn't lost yet, the format can include a bracket reset: if the losers-bracket team wins the first grand final, a deciding match is played so both finalists have exactly one loss.

Roundra builds the winners bracket, losers bracket, grand final, and the reset match automatically — including feeding each losing team into the right losers-bracket slot.

Side by side

Fairness: double elimination forgives one bad game; single does not.
Time & matches: double elimination runs close to twice as many matches.
Simplicity: single elimination is easier for players and spectators to follow.
Best for: single — large fields, tight schedules; double — smaller fields where every result should count.

Which should you choose?

If you need a result fast or have a big field, use single elimination. If the outcome matters enough that no team should go home on one upset — a league finals, a prize event — double elimination is worth the extra matches. Prefer no eliminations at all? A round robin guarantees everyone the same number of games.

Build either format free