Two robots compete in a head-to-head match following the basic system of traditional human sumo matches. Robots are allowed no weapons but may use a flipping mechanism. The purpose is a pushing match between the two robots to force the other from the arena or flip the opponent, so they are deemed no longer able to fight. Multiple weight classes and control systems are allowed (autonomous compete against autonomous and R/C against R/C – they are separate classes and do not compete against each other.)