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Kata-juji-jime countered by Hiza-gatame
A strangle attempted from underneath has to extend an arm to reach the collar. Hiza-gatame takes that arm. Practise it slowly and only under supervision, and never apply it to the point of pain.
No demonstration linked yet, and this is one of the places footage helps most. Know a good one? Suggest a video.
Step by step
The whole sequence in words. Described in the standard right-handed form.
- Feel their hands cross into your collar from underneath you as they attempt Kata-juji-jime.
- Tuck your chin at once to protect your neck and post your weight forward onto your knees.
- Trap their extended near arm against your chest with both of your hands, thumb side up.
- Turn your body away from that arm and place the outside of your knee against the back of their elbow.
- Sit back and squeeze their trapped arm to your chest so their elbow is pressed gently over your knee.
- Apply pressure slowly and stop the instant they tap. Age limits apply to joint locks in most federations: learn this only under instruction.
Each technique's own page carries its full narration, key points and how to receive it; follow the links above.