### Technique Overview
The "Danish Blackfoot" is a variant of the foot lock primarily executed from the **Bottom** position when in **Closed Guard**. This technique focuses on trapping the opponent's foot inside your guard and applying pressure in a specialized manner to achieve a submission. As it involves fine control and precise leverage application, it is particularly reputed among advanced practitioners.
### Japanese Name
- **N/A**: The technique doesn’t have a known Japanese translation or equivalent.
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### Step-by-Step Instructions
#### Initial Setup
1. **Maintain Control:**
- Begin in **Closed Guard** with your opponent postured inside your legs.
- Ensure both of your legs are closed firmly around their hips.
2. **Secure the Upper Body:**
- Cross-collar grip: Use one hand to grip the collar tight to control their posture, preventing them from breaking free easily.
- Off-balance: Use your other hand on their biceps or wrist to slightly pull or push to disrupt their balance.
#### Transition to the Danish Blackfoot
1. **Foot Isolation:**
- Use your grip on their biceps to pull them forward, forcing them to plant one foot next to your hip to maintain balance.
- Take the opportunity to swiftly underhook this foot with your hand, drawing it close to your hip.
2. **Trapping the Foot:**
- Flatten your leg on the side of the trapped foot to lock it tight, preventing withdrawal with your inner thigh.
#### Execution
1. **Create the Lock:**
- Use your grips and legs to lift yourself slightly off the ground, driving your hips into their trapped foot.
- Ensure your grip holds the foot steady and tight.
2. **Apply Pressure:**
- Twist your hip directionally away from the trapped side, utilizing your body weight and leg muscles to reinforce the pressure on the ankle and ligaments.
- Execute this with a controlled pace to ensure the safety of your partner during practice.
3. **Finish the Lock:**
- Keep tightening with gradual tension, so the opponent feels the pressure building on the ankle joint as well as along the foot arch, coerced by your stable guard lock.
- Await a tap or a verbal submission from your opponent once effective pressure is achieved.
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### Considerations
- Mastery of this technique requires understanding where precise pressure should be applied to avoid injuring a training partner.
- Consistent practice with a partner who provides feedback in real-time helps improve efficiency and safety.