Electrical energy source ES feeds programable logic controller together with the voltage feedback. Electrical energy flows to both drivers D, which are controlled with PLC and regulate the power for the motors M, where the energy is converted to mechanical. Both motors drive a single transmission device TD, which is actually a full robot mechanical system, except motors, and a Dohyo together, energy parameters are transformed to fit the work unit WU, wich is an opponents robot system and a Dohyo ring too.
The force you need to push the opponent have to be bigger than critical friction force of the opponent's wheels and the Dohyo surface.
You don't need an enormous power for motors, only slightly bigger than the product of critical friction force of your TD and prefered nominal speed (e. 10cm/s, depends on termal ability, should not overheat).