Steve
Mostly Harmless
I'll work this pass, too, but instead of keeping my elbow in, I tend to focus on pinning the down knee to the mat. So, if I'm stacking my opponent's left leg, I'll really focus on pinning his right knee to the mat. Even if he manages to break down my posture, he'll never triangle choke me if I'm controlling that knee.OK, so he found it in a Judo book...interesting.
This guard pass is still effective but you have to open the guard first and then you have to keep your elbow in close to your body on the side that is not stacking. We train it this way specifically to defend against the triangle when attempting this guard pass.
I've also found, Jarrod, that stacking the leg with the arm and not the shoulder requires a lot more arm strength, and driving against the calf tends to give them space to reposition. What's your secret?