1. Introduction
LEGO Sumo 3kg competition challenges teams to build heavyweight sumo robots using only LEGO components, competing in the premier weight class.
2. Competition Overview
Heavyweight LEGO sumo robots compete in intense matches on a larger dohyo, utilizing advanced engineering and programming to dominate the ring.
2.1. Team Structure
Maximum 5 team members, with only one operator allowed during matches. Due to robot complexity, team collaboration is essential.
2.2. Age Categories
- High School (14-18): Advanced LEGO Mindstorms and custom builds
- University (18+): Expert-level engineering with complex mechanisms
3. Robot Requirements
3.1. Construction Rules
- 100% LEGO: Only official LEGO parts and compatible elements
- Weight Limit: Maximum 3kg including all components
- Size Limit: Must fit in 20cm×20cm square at start
- Expansion: Robot may expand significantly after match starts
| Specification | Limit | Notes |
|---|
| Weight | 3kg | Including all attachments |
| Initial Size | 20×20cm | Height unlimited |
| Expansion | No limit | After match starts |
| Materials | LEGO only | Official parts verified |
4. Dohyo Specifications
4.1. Ring Dimensions
- Diameter: 154cm wooden circle (heavyweight class)
- Color: Black center (144cm) with white border (5cm)
- Height: 5-10cm above ground level
- Surface: Reinforced smooth finish for heavy robots
4.2. Starting Positions
Larger starting areas accommodate the increased robot size. Starting lines (Shikiri-Sen) positioned to allow proper positioning of heavyweight robots.
5. Match Rules
5.1. Match Format
Best of 3 rounds, each round maximum 60 seconds due to increased robot power. Robot that wins 2 rounds wins the match.
5.2. Victory Conditions
- Push opponent completely off the dohyo
- Opponent becomes immobile for 10+ seconds
- Opponent falls apart or stops functioning
- Technical knockout by referee decision
5.3. Starting Procedure
- 5-second countdown for autonomous start
- Robots must be placed touching the white line
- 45-second adjustment period before each round
- Mandatory safety check before each match
5.4. Heavyweight Specific Rules
- Enhanced safety protocols due to robot weight
- Referee may stop match for safety concerns
- Mandatory protective barriers around dohyo
6. Safety Requirements
6.1. Enhanced Safety Measures
Due to the 3kg weight limit, additional safety measures are mandatory:
- Protective Barriers: Reinforced barriers around the dohyo
- Emergency Stops: Multiple emergency stop systems required
- Structural Integrity: Robots must pass rigorous safety inspection
- Spectator Safety: Increased safety distance from competition area
6.2. Prohibited Actions
- Intentional damaging of opponent's robot
- Using projectiles or detachable weapons
- Remote control during autonomous phase
- Modifications that could cause injury
Safety First: All participants must wear protective equipment. Safety violations result in immediate disqualification.
7. Technical Specifications
7.1. Advanced Features
Heavyweight category encourages advanced engineering:
- Complex Mechanisms: Multi-motor drive systems
- Sensor Arrays: Advanced sensor configurations
- Strategic Programming: Sophisticated AI behaviors
- Modular Design: Interchangeable components for strategy
7.2. Power Management
Robots must demonstrate efficient power management for extended matches. Battery safety is paramount with high-power systems.
8. Awards and Recognition
8.1. Competition Awards
- Heavyweight Champion: Tournament winner
- Engineering Excellence: Best mechanical design
- Programming Innovation: Most sophisticated algorithms
- Sportsmanship: Fair play and team collaboration
8.2. Technical Achievement
Special recognition for teams demonstrating exceptional engineering solutions within LEGO constraints.
