From head and arm control you can catch the katagatame or arm triangle choke. You have the option to finish from mount or side
This is one of my favorite submissions filmed at Precision MMA a Dutchess County BJJ school
Single Leg X Sweep
A sweep from the single leg X Guard when your opponent stands in your open guard
filmed at Precision MMA near Poughkeepsie, NY
This awesome technique was shown to me by Matt Arroyo a great MMA Tampa instructor