Ippon Seioinage stands for "One Arm Shoulder Throw." It is part of the 1st Kyo of throws and is considered a hand technique.
As I described in my section on Osotogari, this was one of the two throws covered in my second session.
The basic throw is as follows: You break your opponent's balance as described in the section on kuzushi. Then you let go with your right hand, keeping a tight grip on your opponent's right sleeve and turn your body, wrapping your right arm around your opponent's upper arm. You spring upward from the hips and bend forward, throwing your opponent over your shoulder.
From stepping, as your opponent steps forward with his right foot, you pull strongly with your left arm, step to the left with your right foot and pivot, bringing your body in low against theirs. At the same time, bring your right arm under their left arm and catch it in the bend of your elbow. Bend sharply at the waist while springing upward with the hips. Over they go.
A couple of points seem to make the throw work better:
When you step in for kuzushi, lower your hips. This positions you nicely for the spring that powers the throw.
When you wrap your right arm around your opponent's right arm, don't grab too close to the shoulder. Doing so leaves you vulnerable to a choke.
Instead of catching the arm over the shoulder, catch it more in the crook of your elbow by your side. This reduces the amount you have to lift your opponent and reduces the effort required for the throw. Grasp your opponent's arm tightly between your forearm and upper arm.
It seems to work best when the spring of the hip and the bend are coordinated right. I haven't quite pinned down exactly how they go together but sometimes they go right and other times they don't.
If the opponent successfully resists your attempt at kuzushi, don't try to continue with this throw. Instead, follow up with a throw to the opponent's rear such as Ouchigari.
Especially important with a failed Ippon seioinage is either not to step back out or to be extremely careful in doing so. Getting out can leave you very vulnerable to foot sweeps.
It's very important to get around far enough when stepping in. The line of your feet should be parallel to your opponent's feet and the spacing should put them both inside your opponent's feet.
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