### Ippon Seoi Nage (One-Arm Shoulder Throw)
#### Overview
Ippon Seoi Nage, primarily a Judo throw, has found its utility in Brazilian Jiu-Jitsu (BJJ) as a powerful tool for transitioning from standing into a dominant ground position. This technique involves pivoting your body to throw your opponent over your shoulder using their weight and momentum.
#### Possible Position
- **Standing**: Executed when both practitioners are upright, typically at the start of a roll or competition when grips are established.
#### Step-by-Step Instructions
1. **Gripping and Stance**
- Begin with an orthodox stance: left foot leading if right-handed, right foot leading if left-handed.
- Establish a double collar and elbow grip: right hand grips their left lapel or collar, and left hand grips their right elbow.
2. **Body Rotation and Entry**
- Step forward with your lead foot between your opponent's feet for balance and proximity.
- Pull their collar towards you with your dominant hand while pushing their elbow across their body slightly.
- Drop your hips and rotate your body 180 degrees so your back is aligned with your opponent's chest. You may need to bring your non-dominant knee to the ground for stability and leverage.
3. **Loading the Opponent**
- Raise your elbow connected to the collar grip, lifting and pulling it as your opponent is drawn atop your shoulders.
- Your hip should come under their center of gravity: this is crucial for an effective throw.
- Ensure your feet are aligned shoulder-width apart for stability.
4. **Executing the Throw**
- Elevate your legs by straightening them, thrusting upwards from your feet through to your hips.
- Continuously pull both the collar and sleeve grips. Simultaneously pivot and turn your neck to lead the throw.
- Aim to bring your opponent overhead and downwards onto the mat.
5. **Control and Transition**
- Maintain a grip on their collar to control their descent and direction as they land.
- Follow through by moving into a dominant position. For BJJ purposes, this might include transitioning directly to side control or mount.
#### Defensive Considerations and Variations
- Ensure your grips are strong and secure; a loose grip will compromise the throw’s form.
- Practice a smooth, consolidated rotation and execution to prevent counters.
- Variation with gi and no-gi setups can involve adapting grips to suit sleeve-less techniques, like arm drags into transitions.
**Ippon Seoi Nage** is a dramatic and effective technique to integrate into your repertoire, blending dynamic, quick movements with the leverage and control fundamentals of BJJ.