Pinch - Japanese name not known

Red circle indicates striking surface

Overview
A useful technique that can be used to provoke a strong pain response, looseening at attacker's hold, and giving you escape or counter-attack space.

Used in these katas
Unknown

Striking targets
Testicles, inside of thighs, inside of upper arms

Technique
Make a loose fist. Pinch the loose skin or a testicle between the edge of the curled first finger and the base of the thumb. This provides a much greater crushing force than using the finger tips. Apply with a twisting motion to increase pain.

Strengths

Even to non-damaging parts of the body, a pinch provokes a surprisingly strong escape response from the recipient.

Can be delivered from a full rear bear hug

Weaknesses

Unless delivered to the testicles, a disciplined attacker can resist the pain.

Relatively few effective targets.