taekwondo-project-elements/competition/.net/competition_draw.md

To build and automate a tournament draw and bracket system for World Taekwondo competition, here is a detailed, practical approach:

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1. Participant Grouping and Categorization

Use the comprehensive GroupPlayersForPredraw() filter function (previously implemented) to group participants by WT official age categories, gender, and weight classes.

2. Bracket Generation with Seeding and Restrictions

• Determine the bracket size (next power of two of participants count).
• Seed top athletes if ranking exists; otherwise shuffle randomly.
• Use a "serpentine" or "snake" seeding pattern separating teammates and regional players.
• Assign byes for unfilled slots.

3. Bracket Match and Progression Data Structure

public class Match
{
    public int Id;
    public PlayerDto Player1;
    public PlayerDto Player2;
    public PlayerDto Winner;
    public Match NextMatch;

    public void SetWinner(PlayerDto winner)
    {
        Winner = winner;
        if (NextMatch != null)
        {
            if (NextMatch.Player1 == null) NextMatch.Player1 = winner;
            else if (NextMatch.Player2 == null) NextMatch.Player2 = winner;
        }
    }
}

4. Digital Draw and Match Connection Algorithm

• Create initial matches pairing players (or byes).
• Link winners to subsequent matches for automated progression.
• Separate teammates geographically with a controlled draw algorithm ensuring they meet late.
• Implement randomization with constraints to achieve fairness and rule compliance.

5. Tournament Runner and UI Integration

• Provide APIs or interfaces to input match results.
• Run match advancement automatically invoking SetWinner.
• Display brackets per round with player/pair info.
• Support rescheduling or updating matches live.

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Practical Flow Example:

// Group players by categories
var groups = TaekwondoPredrawHelper.GroupPlayersForPredraw(participants);

// For each group, build bracket and run competition loop
foreach(var group in groups)
{
    var bracket = BracketBuilder.BuildBracket(group.Players);

    // Display initial bracket

    bracket.Display();

    // Example match loop - simulate or wait for input
    foreach (var match in bracket.MatchesInRound(1))
    {
        // Decide match winner (from input or simulation)
        var winner = DecideMatchWinner(match);
        match.SetWinner(winner);
        Console.WriteLine($"Match {match.Id} Winner: {winner.Name}");
    }

    // Continue rounds until final champion
}

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Resources Based on Research

• Digital draw systems used in martial arts optimize teammate separation and seeded fairness.[1][2]
• WT competition brackets align with binary tree structures with predefined links between rounds.[7]
• This approach is scalable from local club up to international competition levels.
• Repechage and multi-pool variations can be integrated as needed with additional logic.[9]

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Summary

You now have a strategy and example to implement a World Taekwondo competition system that automates:

• Participant grouping by official WT categories,
• Bracket creation with seed balancing and teammate separation,
• Match result input and winner progression,
• Dynamic display/update of tournament brackets.

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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