Ko-uchi-gari into Seoi-nage.

Combination (Renraku-waza).

Techniques
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1. Ko-uchi-gari (小内刈), the minor inner reap.
2. Seoi-nage (背負投), the shoulder throw.

About
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The small inner reap draws your partner's foot back and settles their weight forward and low, creating the opening for the shoulder throw.

Step by step (standard right-handed form)
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1. Take your right grips and reap their right foot inwards with the sole of your right foot.
2. Feel them snatch the foot back, their chest coming forward and down over their front leg.
3. Pull their right sleeve down and across with your left hand so that weight keeps coming onto you.
4. Spin in on the ball of your left foot, both hands staying on their right side, and drop your hips below theirs.
5. Straighten your legs and turn your shoulders sharply to your left, loading them across your back.
6. They come over your shoulder and land on their back; keep the sleeve to support the fall.

Receiving it
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When you snatch the attacked foot back, your weight drops forward and low, and that is the opening the shoulder throw uses. Their hips arrive under yours before you have finished recovering. Do not reach for the mat over their shoulder. Keep your chin tucked, stay long, and slap with your free left arm as your back lands, with the sleeve still held.

Demonstrations
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British Judo: Ko-Uchi-Gari into Morote-Seoi-Nage https://www.youtube.com/watch?v=H0e7XRqywts
Destination Judo: Ko-Uchi-Gari into Morote-Seoi-Nage https://vimeo.com/548841629
Akita Judo: Ko-uchi-gari into Morote-seoi-nage https://www.youtube.com/watch?v=glO4xOKWrq8

VI judo notes
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This combination suits gripped-up judo, because both attacks happen inside arm's length. Feel for their weight coming forward in your sleeve hand after the reap, and let your hands decide when to spin. Getting your hips below theirs is a matter of feel: if their belt line is not above yours, do not straighten your legs.

From Waza Book: https://wazabook.com/combinations/ko-uchi-gari-into-seoi-nage.txt