Kuzure-kami-shiho-gatame (崩上四方固), the modified upper four-quarter hold.

Osaekomi-waza (hold-downs).
Required for: 1st Dan (black belt, British Judo Association); 2nd Dan (black belt, British Judo Association); 3rd Dan (black belt, British Judo Association); 4th Dan (black belt, British Judo Association); 5th Dan (black belt, British Judo Association).

About
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Kami-shiho-gatame with one arm controlling uke's arm and shoulder instead of the belt: the practical contest version.

Step by step (standard right-handed form)
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1. Your partner lies on their back; take the upper hold position above their head, facing down their body.
2. On your right side, thread your arm under their right shoulder and grip the belt or the cloth behind their neck, so that shoulder is wrapped.
3. With your left arm, control their left arm: pin it to your side, or trap it between your arm and knee, rather than gripping the belt.
4. Bring your chest down over their chest, slightly off-centre towards the wrapped shoulder, legs wide or knees tucked.
5. This broken form trades symmetry for arm control; switch between it and the pure form as they work their arms free, keeping the chest heavy throughout.

Key points
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1. Control uke's arm and shoulder on one side
2. Keep chest pressure centred over uke's chest
3. Switch between the pure and modified forms as uke escapes

Receiving it
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As the upper hold, but one of your arms is wrapped and controlled, and the weight sits slightly off-centre towards it. The free side is where the escape lives: turn towards your free arm, bridge, and work your hips out sideways. Do not burn everything in the first five seconds; steady pressure and timed bridges beat frantic ones. Tap clearly if you need to stop.

Reference pages elsewhere
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Kuzure-kami-shiho-gatame on the IJF technique reference (International Judo Federation): https://judo.ijf.org/techniques/Kuzure-kami-shiho-gatame

From Waza Book: https://wazabook.com/techniques/kuzure-kami-shiho-gatame/