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Research draft

single-elimination tournament

vr.tr.single-elimination-tournament · ACT.EVT

Let an agent handle single-elimination tournaments by bracket, seeding, rounds, byes and results.

Thing Registry Activities and processes

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent handle single-elimination tournaments by bracket, seeding, rounds, byes and results.

A tournament format in which the loser of each match is immediately eliminated, rounds halving the field until a final decides the winner; used in cups, playoffs and many sports.

What it is for: Deciding a winner quickly among many entrants.

It can be build a bracket; seed entrants; assign byes; track results round by round.

Distinguishing features

One loss eliminates

Rounds halve the field

Seeding avoids early clashes

Byes needed when entrants are not a power of two

What it looks like

A bracket diagram narrowing to a final.

How it is recognised

Brackets with rounds such as quarter-finals

Knockout cups

Double elimination gives a second chance

Related models

is a kind of - category

tournament

is contrasted with - formats

round-robin and double elimination

produces - result

champion

is used in - events

championship

In practice

Families and kinds

knockout cups

playoff brackets

seeded and random draws

single-elimination with third-place match

Standards and regulation

Competition rules of each governing body

Failure modes and hazards

Unfair seeding

Luck deciding outcomes

Bracket errors

Also called

quarter-finalNCAA Division II men's basketball tournamentCollegeInsider.com Postseason TournamentNCAA Division I men's basketball tournamentleague cupFloorball Final4tie with replays possibleBergvall system2025 Women's Rugby World Cup knockout stagefinal fourplay-downNational Football League playoffsbest-of-seven elimination tournamenttwo-legged tieinternational association football clubs cupRussian Bandy Cup2014 FNL Cup2015 FNL Cup2016 FNL Cup2013 FNL Cup2012 FNL CupBBL Cup Winners' Cup2017 FNL Cup2018 FNL Cup2019 FNL Cupassociation football two-legged tie

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Bracket Structure.

Structure is mathematical.

Size

Entrants and rounds.

Size

Bracket size.

  1. How many entrants and rounds are there? measurement
  2. How many byes are needed? measurement

Seeding

Placement.

Seeding

Seeding.

  1. How are entrants seeded? definition
  2. Is the draw random or ranked? definition
Rules Match rules.

Rules decide advancement.

Ties

Tie-breaks.

Ties

Tie-breaks.

  1. How are drawn matches decided? provenance
  2. Is extra time or penalties used? definition

Third place

Bronze match.

Third place

Third-place match.

  1. Is there a third-place match? definition
  2. Why? definition
Results Progress.

Results need tracking.

Progress

Round results.

Progress

Round results.

  1. Who advanced from each round? provenance
  2. Where are official results? provenance

Winner

Final.

Winner

Winner.

  1. Who won the final? provenance
  2. When? provenance
Fairness Format choice.

Formats have trade-offs.

Comparison

Other formats.

Comparison

Format comparison.

  1. Why use single elimination instead of round-robin? definition
  2. What are the trade-offs? boundary

Data

Bracket data.

Data

Bracket data.

  1. How should the bracket be stored as data? action
  2. Is it validated? boundary

What the second pass must settle

  • Should seeding methods be separate entries?
  • How should brackets be represented as data?
  • How should named tournaments be linked?
Draft as JSON