I'll bite. So can you tell us a bit about the 21 grip?
The Russian competitive wrestlers made the 2 on 1 grip popular. It is like fighting from the flank with two hands on one arm of the opponent.
HAL perfected the system into a complete strategy back in the early 1990's. He proved it by strictly using it in Judo competitions and went all the way to winning a Bronze at the Nationals with it.
Each movement in the system is designed to take advantage of how trained fighters are taught to respond to primary moves. Thus, how a pro reacts is actually causing him to fall deeper into your traps.
HAL is a master tactician. He is 71 now and still trains harder than anyone I have ever met on the mats. He makes some powerful claims in his website judoknighterrant.com. Look at his pages on training, fight strength and Judo. HAL is a doer that backs his claims with demonstration, rondori and calculus. He is also a humble and down-to-earth guy, very polite, and lobes to help others.
He is literally the toughest hombre I have ever met.