Double Triple Cannon 2 (DT2)

Double Triple Cannon 2, also known as DT Cannon 2, Double Triple 2 or DT2, is a variation on Double Triple Cannon. Rather than having a "large notch" (as with DT Cannon) that is cleared by a T-Spin Double followed by a T-Spin Triple, in DT Cannon 2, the T-Spin Double and T-Spin Triple are cleared by separate notches. However, similar to DT Cannon, DT Cannon 2 does have a notch for the T-Spin Double on the same side as its overhang.

Wall-Overhang Variation
This is the preferred way to set up DT Cannon 2.

Wall-Notches Variation
The wall-notches variation of DT Cannon 2 is actually one of the harder setups to master. It can only be made by transferring or trimming blocks, therefore it is only practical in mid-game.

Transferring:

DT Cannon 2 STSD
This setup looks identical to DT Cannon 2, with the only difference that one further cell is empty at the bottom (marked light grey in the first picture below). It results in an STSD after the first T-Spin Double is cleared. So, it is usually 3 T-Spin Doubles in total.