Double elimination bracket maker
Build a true two-loss tournament and inspect the winners bracket, losers bracket, byes, seed paths and conditional reset before the event begins.
Setup
How the double elimination generator works
- The active field expands to the next power of two B. The winners bracket contains B−1 matches, the losers bracket B−2, and the grand final adds one: 2B−2 matches before any reset.
- Eight participants therefore produce 7 winners-bracket matches, 6 losers-bracket matches and 1 grand final: 14 matches before a reset. A reset is a fifteenth match only when the previously undefeated finalist loses the first grand final.
- With 13 active participants, B=16 and 3 first-round byes are explicit. A bye advances the available participant without adding a loss; the two-loss rule counts played losses, not empty slots.
- Input-order, manual and deterministic random seeding are supported by the engine. The page’s initial builder uses the input order, so put your intended seed order in the list before generating.
- When bracket reset is enabled, the deciding reset match appears only if the undefeated finalist loses the first final.
Worked example: eight participants and a possible reset
8 participants produce 14 matches before a reset: 7 in winners, 6 in losers and 1 grand final. If the winners-bracket champion wins that grand final, the tournament ends at match 14. If that undefeated finalist loses, the engine adds reset match 15 so both finalists have the same loss allowance.
When double elimination is the right format
Use double elimination when a single bad match should not remove a strong participant, but a full round robin would exceed the venue window.
Single elimination is shorter: an 8-participant field needs 7 main matches, while double elimination needs 14 before a reset. Round robin gives everyone every opponent but needs 28 matches for 8 participants.
Trade-offs to plan for
- The engine accepts 2 to 128 active participants and uses a power-of-two bracket size. Invalid counts or courts stop generation with a warning.
- Elimination matches cannot end in a draw because the next state needs one winner. The product does not apply FRC-specific rules, eligibility rules or an external governing body’s tie-break procedure.
- The reset final is conditional, not a permanently scheduled extra match. Plan a possible final slot if the undefeated finalist loses the first grand final.
Double elimination questions
Why is an eight-team double-elimination bracket 14 matches?
For B=8, the engine creates B−1=7 winners matches, B−2=6 losers matches and one grand final: 7+6+1=14.
When does match 15 appear?
Only after the losers-bracket champion defeats the previously undefeated winners-bracket finalist in the grand final. The reset then gives the final pair a deciding match.
Does a bye count as a loss?
No. A bye is an absent slot and auto-advances the available participant without recording a played loss.
Preview both bracket paths
Enter the field and seed order to see the winners bracket, losers bracket and any required bye warning.
Open the double-elimination maker →