Well, you must move the King into the other camp to be able to give check and checkmate. You also need to occupy the squares on the borderline such that the King cannot escape to that line (this is possible, because the pieces cannot by captured). A defense against this is just to push the King back. A defensive player can always hold a draw by pushing the King back to the borderline whenever the offensive player pushes it into the camp where it can be hurt by check and checkmate.
Well, you must move the King into the other camp to be able to give check and checkmate. You also need to occupy the squares on the borderline such that the King cannot escape to that line (this is possible, because the pieces cannot by captured). A defense against this is just to push the King back. A defensive player can always hold a draw by pushing the King back to the borderline whenever the offensive player pushes it into the camp where it can be hurt by check and checkmate.