Even one Rook is sufficient to make a hard fight against the Queen, provided that the Rook has not to lend its help to other pieces, for instance, to weak Pawns, but has a little protection from elsewhere to lean upon.
White Draws by moving his Rook from B3 to QR3 and back to B3 unless forced to move the King, which clings to the vicinity of its Pawn. Thus White is never in _Zugzwang_ and his pieces are never unprotected.