Deashiharai(Advanced Foot Sweep)

The first is the force P, with which you sweep away his advanced foot. The second is the force Q, with which you pull him down with your left hand. The third is the momentum mv, which is produced when he steps forward with his right foot. The force P overcomes the friction between his right foot and the mat and enables you to complete the sweep. Both the force Q and the momentum mv act together to make him fall the instant his foot has been swept away.

KEY POINTS : a. You should apply this technique the moment your opponent has placed almost half his weight on his advanced foot and is just about to put his entire weight down. At this moment he cannot easily shift the direction of his advanced foot.
b. Therefore timing is very important in the execution of this technique.
c. When you sweep his advanced foot, you push his left shoulder with your right hand so as to make his upper body turn up.

Okuri-ashi-harai (sweeping ankle throw)

Knowledge of the rolling motion of a rowboat will help you understand the nature of okuri-ashi-harai. If you try to upset the boat for fun, you must push its lower side so as to create the rolling motion. By doing this, you are making use of the law of the resultant. What we do in trying to upset a boat we may also do in throwing an opponent in judo. You and your opponent hold each other in main natural posture. He advances to the left. Taking advantage of his motion, you push him in the same direction, as if to scoop him with both your hands and break his posture to the right.

Remind yourself of the rolling of a boat. When he has drawn his right foot close to his left foot and lets almost half of his weight rest on it, you sweep the sole of your left foot against his right, just above the ankle. At the same time you pull down his right sleeve with your left hand. He will then be thrown because both his feet are swept away.

DYNAMIC EXPLANATION : There are four forces that act on your opponent. The first is the force with which you lift his body with a scooping motion. The second is the force P, with which you sweep your left foot against his right one to overcome the friction between it and the mat. The third force is the gravity G. The fourth is the force Q with which you pull him down. The gravity G and the force Q act together to make him fall on the mat since both his feet have been swept away. KEY POINTS : a. A good chance to apply this technique is when your opponent draws his right foot close to his left foot and rests almost half his weight on it. b. Your left leg should be extended as you sweep.