Overview
This technique has many of the same advantages as the other knuckle fists and finger techniques - primarily that it is useful for delivering a precision strike to a vulnerable area. This is particularly because it's relatively strong and can be used to attack side-facing targets with a front punching action, or of course, it can be swung in an arc to strike at a right-angle to the target.
Compare to: Nakadaka ippon ken, Ippon nukite
Striking targets
Pressure points, particularly, the temples, side of the neck, under the biceps, side of the ribs, side of the jaw
Used in these katas
Unknown
Technique
Make a tight fist. Stick the thumb out to the side, and brace it against the first finger. Deliver in a punching or arcing motion.
Strengths
Extremely painful! Can cripple an opponent if delivered accurately.
Weaknesses
You're probably better to go with a simple punch or teisho, unless you specifically wish to cause immense pain.
