Attacking
To perform the throw you must force your opponent off balance to the front. It is often done when your opponent takes a defensive posture with the legs spread and arms pushing strongly as the upper body is bent forward. You enter by pivoting or hopping in until you are standing on one leg between your opponent's feet facing the same direction as the opponent. Sliding the other leg between your opponent's legs you stretch it out and raise it up as you lean forward and pull your opponent onto your upper thigh. You will then bounce the opponent up and continue to turn and roll forward to complete the throw.
Books
Uchimata by Hitoshi Sugai is the best book available on this throw. It is an excellent examination of this powerful and popular tournament throw
including many effective variations and follow-ups. It is also covered in less detail in Judo Unleashed and Black Belt Judo: Skills and Techniques by Neil Ohlenkamp.
Videos
Here is a video of uchimata, another
uchimata and
here is a third demonstration.
Here is a hopping version called ken-ken
uchi mata, and here is a counter throw called uchimata
sukashi. Here are some videos of this throw being performed in competition:
Uchimata 1 -- Uchimata 2 -- Uchimata 3 -- Uchimata 4
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