How tournament brackets work

Lose once and you are out. Sixteen teams become eight, then four, then two, then a winner.

It is the shortest format there is. A sixteen team bracket is fifteen games, because every game eliminates exactly one team and fifteen teams have to be eliminated to leave one standing. That arithmetic is worth remembering: games equals teams minus one, always.

The cost is obvious and worth saying out loud. Half your teams play one game and drive home. For a competitive event that is fine. For eight year olds whose families gave up a Saturday, it is not.

Lose once and you drop into a losers bracket. Lose twice and you are out. Everybody is guaranteed at least two games.

It roughly doubles the schedule: about twice the number of teams, minus one or two depending on how the final is handled. Sixteen teams is around thirty games rather than fifteen.

That is the whole trade. Double elimination is fairer, more forgiving of one bad morning, and much better value for families who travelled. It also needs roughly twice the field time.

Seeding ranks teams before the tournament so the bracket can keep the strongest apart until late. In standard seeding the first seed plays the last, the second plays the second from last, and so on.

The point is not to reward the good teams. It is to stop the two best teams meeting in round one, which produces a final that everybody knows was really the semi.

If you have no basis for seeding, say so and draw at random. An invented seeding is worse than an honest random one, because it looks like a judgment you are willing to defend.

Brackets want a power of two: 4, 8, 16, 32. With any other number of teams, somebody has to skip the first round, and that skip is a bye.

Eleven teams in a sixteen slot bracket means five byes. Those go to the top seeds, which is the second reason seeding matters: a bye is a real advantage, so it should be earned rather than handed out by accident.

Work backwards from field hours rather than forwards from preference.

• Count your games: teams minus one for single, roughly double for double elimination.
• Multiply by the length of a game plus changeover.
• Divide by how many fields run at once.
• Compare that to the hours you actually have.

Sixteen teams, double elimination, thirty games at forty five minutes across three fields is about seven and a half hours of play. That is a full day with no slack in it, and the first rain delay eats your final.

If the number does not fit, the honest fixes are fewer teams, more fields, shorter games, or single elimination. Hoping it runs quickly is not one of them.

Plenty of youth tournaments run pool play first, then a bracket for the top finishers. It guarantees everybody three or four games and is popular for exactly that reason.

Playbook Logix generates single and double elimination brackets. If you run pools, the usual approach is to work out your pool results however you normally do, then build a bracket for the teams that advanced.

The bracket generator is free and needs no account. Pick single or double elimination, enter your teams, and it handles the seeding, the bye placement and the losers bracket routing.

See running a tournament.