This technique I found while working for a choke on a student a year or so ago. I had the back and he was on all fours posted off the floor as if he had considered rolling through. I kept the "harness grip" taught to me by Brad Souders and waited patiently. It then came to me that if I trapped the wrist of the lower end of the harness that it might buy me a moment or two and I may be able to slip my opposite side heal across like a seat belt over the shoulder and then fall to my side allowing me to hip off for a deep triangle. I went with the plan and it worked like a charm! You have angle, momentum and element of surprise on your side. When you have the back of an opponent they typically look to defend chokes and arm bar switches. Ryan Hall coached me during my Gi division a couple months back and witnessed the "seat belt triangle" which lead to my Gold metal that day. He smirked and mentioned that he "liked my triangle set up". This genuinely moved me since he is a true master of the triangle choke.
(Thanks Ryan - GM)
The Break Down:
1: Gain control of your opponent with both hooks and harness grip (recommended). This technique clearly doesn't work with your opponent flat due to lack of hooks. The best scenario that I have found for this technique is if they or propped off the floor looking for a defensive counter.
2: Once you have gained full control and the necessary space, you then look to trap the wrist closest to the under hook side of the harness grip.
3: Once you gain wrist control, now you pull their wrist down and up generating a small pocket for your foot to swim through. (This only buys you moments so be quick!)
4: Now that their wrist is out of the way and pinned, you fall to the opposite side (away from the locked wrist). As you fall to the side (POST) your available hand giving you the hip control you need to lace your same side foot through and over the shoulder. Once your foot is over their shoulder, release the wrist and switch to rubber guard securing the circle and shutting down their ability to turn in to you for posture. (Note: If they do power in, switch to arm bar for a back up. You'll likely have to roll through). The foot that was on the wrist lock side should now be free giving you the opportunity to hip off making the seat belt tighter and the triangle deeper. Lace your feet in normal triangle fashion. You can also hold the foot "Lister style" to secure the triangle, or you can lace and leave to attack the outside arm for a hugger arm bar -- triangle combo.
