Sumi-gaeshi is a sutemi-waza like Tomoe-Nage. The two throws are similar. The difference being the use of the foot. See the animation below:
For more judo throws visit The Ultimate Guide to Every Judo Technique.
How to Throw with Sumi-gaeshi
See more on how to do this throw and others in the book, Fifty Throws and Holds. Get your copy in the Judo Shop.
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