Artemis BJJ (MYGYM Bristol), Can Sönmez, Bristol, UK - 17/03/2017
If your partner turns underneath your mount, such as when they try to get an elbow into your knee, you can switch to technical mount. Put your weight on your hands, in order to make it easy for your legs to slide into position. When they turn, they will open up some space by their back. Slide your knee up into that space, aiming to get it by their head. With your other leg, bring your heel to their far hip. You're also going to twist your torso, meaning that you are facing in the same direction they are. Bring your chest tight to their shoulder blade, your lower arm going over their shoulder, the top arm under their armpit. Clamp your hands together, in a position much like the back.
For the standard technical mount choke, use the hand you have under their top arm to grasp their nearest collar, then open it up. Your other hand curls around their neck, whereupon you can feed the collar for a tight grip. Your first hand is now going to push through past the crook of their elbow, catching their arm in the process. Bring that hand behind their head, then pull your collar gripping hand back towards you, snaking around their neck. This should result in a tight choke: close it off by pushing the fingertips of the hand behind their head to the mat. That drives their head into the collar, which you're also tightening up at the same time.
If they manage to block your choking hand, you can instead switch to an armbar. Your top arm will reach through and grab your own gi, while your other arm will post directly in front of their face. This help prevent them escaping the attack. Lean towards their feet, step your leg around their head, then drop back for the armbar, squeezing your knees as usual.
Teaching Notes: I focused on explaining technical mount and the arm thread choke today, mentioning the armbar without going through it in detail. I think that works ok, especially as there were a few new people who hadn't seen the basics of going to technical mount and taking the back. I included them both as drills too, which hopefully helped familiarise people with them before getting into the main technique. Positioning the chest on the shoulder blade is something to emphasise whenever I teach technical mount, especially the move to the back.