Nihonken (二本拳)

Introduction

Nihonken (二本拳) is a fist form using two projecting knuckle joints. It combines the basic structures of hitosashiyubi ipponken and nakayubi ipponken.

Definition

The second joints of the index and middle fingers project forward together to form the striking surface.

Terminology

Japanese: 二本拳
Romaji: nihonken
English: two-knuckle fist

Structure / Form

• close the hand into a compact fist
• project the second joints of the index and middle fingers
• keep the remaining fingers closed
• use the thumb to lock and support the structure
• keep the wrist straight and aligned with the forearm

Striking surface

Primary: the projecting second joints of the index and middle fingers.
Avoid contact with other parts of the fist, fingers or palm.

Basic principles

The two projecting joints must form an even, stable contact surface. Transfer force through the whole body and apply kime at impact.

Execution and use

Drive the fist on a controlled line, contact with both projecting joints and retract immediately. Nihonken is used in thrusting and downward striking actions.

Training

Use kihon, controlled repetitions and precision practice. Focus on an even contact surface, thumb support, straight wrist and stable structure.

Common errors

• uneven projecting joints
• unstable hand structure
• contact with another part of the fist
• bent wrist

Summary

Nihonken (二本拳) concentrates force through the second joints of the index and middle fingers in a compact two-knuckle structure.