D'Arce Choke from Half Guard
Used from half guard when the opponent has an underhook and straps your leg. Drives forward to compress the neck using forearm pressure and bicep grip, finishing via neck crank mechanics rather than pure squeezing.
6 steps
· save to drill into each- 1Identify the trigger position: opponent has an underhook and straps your leg.0:49
- 2Thread your arm over the opponent's shoulder and under their head.0:52
- 3Grab the opponent's head with both hands.1:11
- 4Slide your forearm down the back of the head until your elbow touches the mat.1:28
- 5Bring your free hand up to grip your own bicep.1:38
- 6Drive forward with your weight, pushing the choking arm up into the neck while pulling the other arm down.1:51
From the source video

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Then the round started — and you forgot it.