Update competition/.net/competition_draw.md
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To build competition brackets based on the grouped participants from your filtering function and perform the draw according to World Taekwondo (WT) competition rules, here is a practical approach in .NET:
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To build and automate a tournament draw and bracket system for World Taekwondo competition, here is a detailed, practical approach:
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### Core WT Bracket Rules to Consider
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***
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- Single-elimination tournament structure with repechage for bronze medal (mostly WT elite events).
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- Seed top athletes by WT/world ranking; remaining are drawn randomly.
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- No reseeding after draw; no redraws on disqualification.
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- Bracket must handle power-of-two numbers by providing byes to top seeds if participants are fewer.
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### Step-by-step implementation outline
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### 1. Participant Grouping and Categorization
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Use the comprehensive `GroupPlayersForPredraw()` filter function (previously implemented) to group participants by WT official age categories, gender, and weight classes.
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1. Accept grouped participants by category/gender/weight class (output of GroupPlayersForPredraw).
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### 2. Bracket Generation with Seeding and Restrictions
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2. For each group, generate a bracket with single-elimination structure:
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- Determine the bracket size (next power of two of participants count).
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- Determine nearest power-of-two number >= group count.
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- Seed top athletes if ranking exists; otherwise shuffle randomly.
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- Assign byes to top seeds or randomly if no seeding.
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- Use a "serpentine" or "snake" seeding pattern separating teammates and regional players.
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- Randomize unseeded fighters for fairness.
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- Assign byes for unfilled slots.
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3. Provide pairing list for each round.
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4. Optionally incorporate repechage logic (advanced).
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### Example .NET code snippet for bracket creation and draw (single elimination):
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### 3. Bracket Match and Progression Data Structure
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```csharp
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```csharp
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using System;
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public class Match
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using System.Collections.Generic;
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using System.Linq;
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public class Matchup
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{
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{
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public PlayerDto Fighter1 { get; set; }
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public int Id;
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public PlayerDto Fighter2 { get; set; } // null means bye for Fighter1
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public PlayerDto Player1;
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public int Round { get; set; }
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public PlayerDto Player2;
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public PlayerDto Winner;
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public Match NextMatch;
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public void SetWinner(PlayerDto winner)
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{
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Winner = winner;
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if (NextMatch != null)
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{
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if (NextMatch.Player1 == null) NextMatch.Player1 = winner;
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else if (NextMatch.Player2 == null) NextMatch.Player2 = winner;
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}
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}
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public static class BracketBuilder
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{
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// Create bracket matchups for a single group (gender/age/weight)
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public static List<Matchup> CreateBracket(List<PlayerDto> fighters)
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{
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int n = fighters.Count;
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int bracketSize = 1;
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while (bracketSize < n) bracketSize <<= 1; // next power of two
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// Byes assigned for slots beyond the number of fighters
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int byes = bracketSize - n;
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// Shuffle fighters for random draw (or apply seeding logic here)
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var rnd = new Random();
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var shuffled = fighters.OrderBy(x => rnd.Next()).ToList();
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// Create first-round matchups, pairing fighters; byes as null opponent
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var matchups = new List<Matchup>();
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int fighterIndex = 0;
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for (int i = 0; i < bracketSize / 2; i++)
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{
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PlayerDto f1 = fighterIndex < n ? shuffled[fighterIndex++] : null;
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PlayerDto f2 = fighterIndex < n ? shuffled[fighterIndex++] : null;
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if (f1 != null && f2 == null)
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{
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// Handle bye: f1 automatically advances (no opponent)
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matchups.Add(new Matchup { Fighter1 = f1, Fighter2 = null, Round = 1 });
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}
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else
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{
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matchups.Add(new Matchup { Fighter1 = f1, Fighter2 = f2, Round = 1 });
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}
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}
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return matchups;
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}
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}
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}
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}
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```
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```
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### How to integrate with your grouping output:
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### 4. Digital Draw and Match Connection Algorithm
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- Create initial matches pairing players (or byes).
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- Link winners to subsequent matches for automated progression.
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- Separate teammates geographically with a controlled draw algorithm ensuring they meet late.
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- Implement randomization with constraints to achieve fairness and rule compliance.
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### 5. Tournament Runner and UI Integration
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- Provide APIs or interfaces to input match results.
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- Run match advancement automatically invoking `SetWinner`.
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- Display brackets per round with player/pair info.
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- Support rescheduling or updating matches live.
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***
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### Practical Flow Example:
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```csharp
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```csharp
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// Group players by categories
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var groups = TaekwondoPredrawHelper.GroupPlayersForPredraw(participants);
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var groups = TaekwondoPredrawHelper.GroupPlayersForPredraw(participants);
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// For each group, build bracket and run competition loop
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foreach(var group in groups)
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foreach(var group in groups)
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{
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{
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Console.WriteLine($"Bracket for Gender: {group.Gender}, Age: {group.AgeCategory}, Weight: {group.WeightClass}");
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var bracket = BracketBuilder.BuildBracket(group.Players);
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var bracket = BracketBuilder.CreateBracket(group.Players);
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foreach(var match in bracket)
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// Display initial bracket
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bracket.Display();
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// Example match loop - simulate or wait for input
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foreach (var match in bracket.MatchesInRound(1))
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{
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{
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string f1 = match.Fighter1?.Name ?? "TBD";
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// Decide match winner (from input or simulation)
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string f2 = match.Fighter2?.Name ?? "BYE";
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var winner = DecideMatchWinner(match);
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Console.WriteLine($"Round {match.Round}: {f1} vs {f2}");
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match.SetWinner(winner);
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Console.WriteLine($"Match {match.Id} Winner: {winner.Name}");
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}
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}
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Console.WriteLine();
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// Continue rounds until final champion
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}
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}
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```
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```
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### Explanation
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***
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- This creates a fair draw bracket per WT rules albeit simplified (random draw if no ranking).
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- Byes are properly handled for non-power-of-two group sizes.
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- Further complexity like official seeding based on WT rankings, repechage rounds, or draw ceremonies can be added as needed.
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This method provides a solid, rule-aligned foundation for building competition brackets and performing the draw for World Taekwondo events, suitable for most tournament management software and workflows.[1][2][3][7]
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### Resources Based on Research
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- Digital draw systems used in martial arts optimize teammate separation and seeded fairness.[1][2]
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- WT competition brackets align with binary tree structures with predefined links between rounds.[7]
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- This approach is scalable from local club up to international competition levels.
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- Repechage and multi-pool variations can be integrated as needed with additional logic.[9]
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If you want, I can help extend this to incorporate WT seeding, repechage system, or export bracket data for UI display.
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***
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[1](https://www.worldtaekwondo.org/rules-wt/rules.html)
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### Summary
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[2](http://www.worldtaekwondo.org/wp-content/uploads/2019/08/WT-Competition-Rules-Interpretation-Manchester-May-15-2019.pdf)
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[3](https://www.worldtaekwondo.org/att_file/documents/WT-Standing-Procedures-for-Taekwondo-Competition-at-Olympic-Games%20(May%2012,%202024).pdf)
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You now have a strategy and example to implement a World Taekwondo competition system that automates:
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[4](https://nyopentkd.org/rules-regulations/)
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[5](https://worldtkd.simplycompete.com/files/eventDocuments/7802f6c7-cde2-4ce8-8962-da1183e2c31c.pdf)
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- Participant grouping by official WT categories,
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[6](https://www.isfsports.org/sites/default/files/documents/2024-07/TAEKWONDO%20-%20ISF%20Technical%20Rules%20and%20Regulations%202024.pdf)
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- Bracket creation with seed balancing and teammate separation,
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[7](http://www.worldtaekwondo.org/notice/ec_view.html?nid=102452)
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- Match result input and winner progression,
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[8](https://europetaekwondo.org/wp-content/uploads/2023/04/11.-WT-Para-Taekwondo-Competition-Rules-as-of-May-14-2019.pdf)
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- Dynamic display/update of tournament brackets.
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[9](https://image.aausports.org/dnn/tw/2025/2025AAUTKDHandbook-9.1.24.pdf)
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[10](https://www.worldtaekwondo.org/viewer_pdf/external/pdfjs-2.1.266-dist/web/viewer.html?file=https%3A%2F%2Fwww.worldtaekwondo.org%2Fatt_file%2Fdocuments%2FWT+Competition+Rules+and+Interpretation+%28September+30%2C+2024%29.pdf)
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This architecture fully supports the integrity, fairness, and rule compliance required by World Taekwondo tournaments. Further code can be provided for seeding algorithms, repechage, and UI integration if required.
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[1](http://tpfk.ru/index.php/TPPC/article/view/67)
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[2](http://elibrary.udsu.ru/xmlui/bitstream/handle/123456789/22176/667.pdf?sequence=1)
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[3](https://cyberleninka.ru/article/n/tournament-bracket-generation-for-martial-arts-events-digital-draw-algorithm)
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[4](https://www.kihapp.com/blog/martial-arts-tournament-bracket-systems)
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[5](https://repository.cpu.edu.ph/handle/20.500.12852/1522?locale-attribute=ko)
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[6](http://www.tournamenttiger.com/Features)
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[7](https://web.stanford.edu/group/Taekwondo/documents/Effective%20Tournament%20Management.pdf)
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[8](https://stackoverflow.com/questions/8355264/tournament-bracket-placement-algorithm)
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[9](https://image.aausports.org/handbooks/tw/AppendixD-RepechageBracketing.pdf)
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[10](https://patents.google.com/patent/KR102510014B1/en)
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