### Overview
The **rear-naked choke**, also known as **RNC**, is a classic submission hold used to apply pressure to the carotid arteries, cutting off blood supply and rendering the opponent unconscious. This effective and fundamental technique is predominantly performed from the back mount when you have a dominant position behind your opponent.
### Japanese Name
The Japanese name for the rear-naked choke is "**Hadaka-jime**."
### Position
- **Back Mount** (Top): The practitioner is behind the opponent, often with hooks (legs) inserted and controlling their upper body to prevent escape.
### Step-by-Step Instructions
1. **Obtain the Back Mount**
- Secure the back mount position on your opponent by either taking them down from standing or transitioning from another dominant position.
- Insert your hooks by wrapping your legs around your opponent's waist, controlling their hips and restricting their movement.
2. **Seat Belt Grip**
- Employ the 'seat belt' position. One arm should slide over one of their shoulders while the opposite arm should go under the other arm. Your hands should meet in front of your opponent's chest.
- Grip your hand that went over the shoulder by wrapping your other hand around your wrist to secure the hold.
3. **Open Up Space**
- Use the arm that went over the shoulder to control and lift your opponent's chin slightly, creating a small opening for your choke to slide under their jaw.
4. **Slide the Choking Arm Into Position**
- With the opening you've created, slide the arm that was over the shoulder deeper until your elbow lines up under your opponent's chin.
- Your hand should wrap around their neck and reach the opposite shoulder.
5. **Secure the Choke**
- Quickly remove the other hand (the underhooking hand) from the seat belt grip and slide it behind your opponent's head.
- Clasp the hand of the choking arm with the palm of the free hand or make a fist, securing it near the top of their shoulder like a knuckle grip.
6. **Apply Pressure**
- Squeeze your elbows together to apply pressure to the sides of your opponent's neck.
- Maintain leverage by keeping your own elbows tight to your body as you lean back slightly, increasing the pressure.
7. **Finish the Choke**
- Keep your core and hooks engaged to prevent any escape efforts from your opponent.
- Hold the position until they tap or go unconscious. Remember to release immediately upon a tap or unconsciousness for safety.
### Safety and Considerations
- Always prioritize safety and control in training. Never apply a choke with full force without giving your opponent ample opportunity to tap.
- Practice techniques under supervision to ensure correct execution form and pressure application.
Whether for self-defense or in a competitive setting, mastering the **rear-naked choke** can make a crucial difference, making it one of the staple submissions in Brazilian Jiu-Jitsu.