When you control the head…An old cliche in is that if you control the whole body. There is a LOT of truth to this. Learning to exploit the value of this is a big part of your progress in Jiu jitsu. It has many manifestations. of the most important for grappling is the use of the triangle not in its usual sense as a stranglehold, but rather as a means of immobilizing the head so that joint become more powerful. A fine example of this is Kimura. It can be very difficult to finish a Kimura when your opponents head is to move around. When you begin in a triangle that immobilizes the head and THEN apply a Kimura the results can be . The same goes for armbars, even American locks and wrist locks. Much of the defense to these moves involves a preliminary movement of the head – when that is taken away the locks become far more difficult to escape and more devastating in their effects. Next time your triangle isn't working so we'll as a – use it to attack with joint locks – I'm sure you'll be impressed with the results!