As their combined names imply, these new pieces combine their moves. In a hostile occupation the piece that occupies the rook then controls the move of the rook for its own forces. To play for a hostile occupation becomes a standard element of strategy in Superchess. By the rules of Chess one cannot move into check. As all the rules of Chess apply in Superchess, one's superpiece may not leave a hostile occupation if the opponent's rook will be left in a position of check to one's king.
Hostile occupation can result in two other unusual situations.
In the same way, it could also stop a castle move. When a piece occupies a rook it becomes a superpiece and is then called, specifically, a superqueen, superbishop, superknight or superpawn. As part of a hostile occupation, it moves with the opponent's rook under its control. It can leave the occupying position to move independently from the rook. A manoeuvre of an occupied rook always includes the possibility of the superpiece separating for more strategic possibilities.