Robot-sumo

Robot-sumo, or robo-sumo, is a type of robot combat in which two robots attempt to push each other out of a circle (in a similar fashion to the sport of sumo). The robots used in this competition are called sumobots.

The engineering challenges are for the robot to find its opponent (usually accomplished with infrared or ultra-sonic sensors) and to push it out of the flat arena. A robot should also avoid leaving the arena, usually by means of a sensor that detects the edge.

The most common "weapon" used in a sumobot competition is an angled blade at the front of the robot, usually tilted at about a 45-degree angle towards the back of the robot. This blade has an adjustable height for different tactics.

Robot-sumo is divided into classes, fought on progressively smaller arenas:
 * Heavy-weight. Standard in the National Robotics Challenge. Robots may weigh up to 125 pounds (56.8 kg) and fit in a 2-foot cube (61 cm).
 * Light-weight. Also standard in the National Robotics Challenge. Robots may weigh up to 50 pounds (22.7 kg) and fit in a 2-foot cube (61 cm).
 * Standard class (sometimes named Mega-sumo) robots may mass up to 3 kg and fit inside a 20 cm by 20 cm box, any height.
 * Mini-sumo. Up to 500 g mass, 10 cm by 10 cm, any height.
 * Micro-sumo. Up to 100 g mass, must fit in a 5 cm cube.
 * Nano-sumo. Must fit in a 2.5 cm cube.

Competitions

 * Robowars Annual robotic competition in Montréal, Québec, Canada
 * RoboChallenge Biggest robotics competition held in Bucharest, Romania
 * RoboCore WinterChallenge Biggest robotics competition held in Brazil
 * Competencia Robotica Biggest robotics competition held in Valparaiso, Chile.
 * BattleLab Robotica Annual competition in Cluj-Napoca, Romania
 * International RoboGames Annual competition with global sumo contestants
 * Istrobot Annual robotic competition in Bratislava held Mini-Sumo category until 2011
 * Milford Autonomous Robotics Competition Annual competition near Cincinnati, OH
 * Robofest RoboSumo Competition
 * RobotChallenge Annual robotic competition in Vienna with Standard-, Mini-, Micro-, Nano-, Lego- and Humanoid-Sumo
 * Official French Tournament
 * Robot sumo Angers Annual French robotic competition in Angers
 * Southern Illinois University Edwardsville's Robot-Sumo Competition
 * BalticRobotSumo Annual Standard-Sumo, Mini-sumo and Roomba-Sumo robotic competition in Latvia, Lithuania and Estonia. Instead it is lately held annual together with Estonian Robotex and later will be Joined with other Baltic international level national annual competitions Latvijas Robotikas Čempionāts and Lithuanian Robotiada
 * Robot-SM The Swedish Robotics Championship with Standard- and mini-sumo.
 * SumoRobotLeague Annual North American Sumo Robot tournament with smaller regional tournaments.
 * Baronas 2017 National Robotics Competition in Indonesia, Sumo Category 2017
 * Robotic Arena Annual robotic international competition held in Poland including Mega-, Mini- and Nano-Sumo, among other competitions.
 * Roboton.io Online virtual robot competitions.