counter
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.
Receiving it
You are the one attacking the strangle from underneath, and reaching for the second collar is what leaves your arm long and available. The counter is felt as your elbow being pinned against their chest while their body turns away from it: at that point the strangle is finished and only the arm matters. Tap loudly and early, on them or on the mat, and do not try to spin out of a lock that is already on. Age limits apply to joint locks in most federations.
VI judo notes
Both judoka are in continuous contact here, so nothing in this exchange depends on sight for either of you. Because the tap is the whole safety system, agree before you start how you will give it and how you will receive it: a hand tap on the body is felt, a mat tap may not be, and a voice is heard by both. Apply the pressure slowly enough that the tap always arrives first.
Each technique's own page carries its own full narration and key points; follow the links above.