There are three that we have been tought. I will teach you one. Your in a head lock and your opponent has you bent over cranking on your neck. First lets assume he is right handed, reach your left arm around hehind his shoulder up toward his face, your hand will now be in his facial area. Place your hand under his nose (ridge hand) and push upward. That part of your nose is very sensitive and he won't be able to stay in that position for long. As your pushing the nose in the upward motion your left leg is used to sweep his right leg out from under him. Your opponent will fall in a backward motion. This works very well, try it in class.