G421 1 defender at a time. No more than 1 ROBOT may be on the opponent’s side of the FIELD (i.e. containing the opponent REEF) with its BUMPERS fully outside and beyond the BARGE ZONES.
Violation: MINOR FOUL, and for every 3 seconds in which the situation is not corrected, a MAJOR FOUL is assessed.
Note, G422, G423, G424 are mutually exclusive. A single ROBOT to ROBOT interaction which violates more than 1 of these rules results in the most punitive penalty, and only the most punitive penalty, being assessed.