TBD team with their remotes guiding their robots. Caltechs 31st annual Engineering Design Competition will pit robots against robots in an action packed soccer match dubbed the Tridroid Cup. Tuesday, March 8, 2016.Though 12 soccer balls are on the field at a time, the teams must get past robotic goalies to score. Caltechs mechanical engineering students designed, build and run the teams of up to three robots.(Photo by Walt Mancini/Pasadena Star-News)