The basic rule: two losses
Double elimination gives every team a second chance. A team is eliminated only after losing twice. The tournament starts with a winners bracket. A first loss drops a team into a losers bracket. A second loss ends its run.
The winners-bracket champion reaches the grand final without a loss. The losers-bracket champion reaches the grand final with one loss. The grand final decides the title; an optional reset final protects the two-loss rule if the winners-bracket champion loses game one.
Winners bracket
The winners bracket is a standard single elimination bracket. It uses the next power of two for the field; if the field is not a power of two, top seeds receive byes. Each winners-bracket match sends its winner forward and its loser to the losers bracket.
Losers bracket
The losers bracket is not a second single elimination bracket. It has two kinds of rounds:
- Consolidation rounds pair winners from the previous losers round.
- Drop-in rounds pair a losers-bracket winner with a team that just lost in the winners bracket.
The rounds alternate. The number of losers-bracket rounds is 2 × (winners rounds − 1). An 8-team bracket has 3 winners rounds and 4 losers rounds; a 16-team bracket has 4 and 6.
Grand final and bracket reset
The grand final matches the winners-bracket champion against the losers-bracket champion. If the winners-bracket champion wins, it finishes undefeated. If the losers-bracket champion wins, both teams have one loss.
Two rule sets are common:
- Single grand final: one game decides the title. The winners-bracket champion can be eliminated with one loss in this game. This is the simpler and more common casual format.
- Reset final: if the losers-bracket champion wins game one, a second game is played. The winner of that game is champion. This guarantees that the champion has at most one loss.
TourneyDraw makes the reset final a checkbox, so you can match your event rules.
Byes
If the field is not a power of two, the bracket rounds up and top seeds receive byes in the winners bracket. A bye never counts as a loss. In the losers bracket, a slot that would receive a loser from a bye match is empty; the other team advances automatically. Empty matches stay in the layout for alignment but are not played.
Match counts by field size
| Teams | Winners bracket | Losers bracket | Grand final | Total (no reset) |
|---|---|---|---|---|
| 4 | 3 | 2 | 1 | 6 |
| 8 | 7 | 6 | 1 | 14 |
| 16 | 15 | 14 | 1 | 30 |
| 32 | 31 | 30 | 1 | 62 |
| 64 | 63 | 62 | 1 | 126 |
| 128 | 127 | 126 | 1 | 254 |
For any n, the guaranteed total is 2n − 2. A reset final adds one match if it is played.
Worked example: 8 teams
- The winners bracket has 7 matches. Four quarterfinals produce four losers; those four drop into the losers bracket.
- Losers round 1 pairs those four teams into two matches. Two are eliminated with their second loss.
- Winners round 2 produces two more losers. Losers round 2 pairs each of them with a losers round 1 winner. Two teams are eliminated.
- Winners final produces one loser. Losers round 3 pairs the two remaining losers-bracket winners; one is eliminated.
- Losers final matches that winner against the winners-final loser; one is eliminated.
- The grand final matches the 3–0 winners-bracket champion against the 2–1 losers-bracket champion. If the losers-bracket champion wins and a reset is on, a second final is played.
The total is 7 + 6 + 1 = 14 matches, or 15 with a reset final.
Common questions
Double elimination takes longer than single elimination: about twice as many matches. It rewards consistency and reduces the chance that one bad game ends a strong team's run. The trade-off is a more complex bracket and a longer schedule.