If you are able to get to a position where you are about the pass half-guard, your opponent’s best defense is to throw their leg over your head and try to prevent you from passing. It’s the correct defense, and really the only option that they have, but it also makes them vulnerable to a leg-lock known as “the footbreaker” estima lock.
In this submission, getting the right entry is the most important aspect. While you will be able to lock down the foot as soon as your opponent throws their leg around you, chances are you won’t have enough leverage to get the tap until you roll over into the proper position.
To see this technique demonstrated, be sure to check out the video below: