From the Over Under position use RB/R1 + X/Square to Pull Guard, or RB/R1 + Y/Triangle to perform a Guard Pull followed by a Sweep to Mount.
To perform a Flying Triangle, use the LT/L2 + RB/R1 + Y/Triangle combination.
Furthermore, a Back Rear Naked Choke can be done from the Back Clinch. Use LT/L2 + RB/R1 + X/Square or Y/Triangle.
To do a Standing Guillotine, use LT/L2 + RB/R1 + X/Square from the Muay Thai or Single Under Clinch position.
Now, you’ll be in the Standing Guillotine position, simply press X/Square or Y/Triangle to perform a Standing Guillotine submission.
A Flying Omoplata can be done from Over Under Clinch by using the combination LT/L2 + RB/R1 + X/Square.
Use LT/L2 + RB/R1 + X/Square or Y/Triangle from Collar Tie Clinch to do a Flying Armbar.