Matt Darcy shows how to drown your opponent with pressure. Use the Hidden Collar tilt when your opponent has a strong turtle.
Matt Darcy shows how to use the hidden collar choke when your opponent turns away from the pressure trying to get to their knees.
Matt Darcy shows part 2 of the simple choke system from the back. This is a great system to learn and should be the first thing you employ when attacking the back.
Matt Darcy shows a system that everyone should start out with when attacking the back.