Triple Double Attack Setups

Triple Double Attack, sometimes referred to as Triple-Double, C-Spin, or just plainly TD, is a T-Spin combo that consists of a T-Spin Triple followed by a T-Spin Double. A player performs a T-Spin Triple that leads into a T-Spin Double.

When referring to the term "TKI" or "TKI積み" (TKI setup), Japanese players always mean the TD attack setup, while western players mean the TKI 3 opening.

The C-Spin
Empty field Triple-Double setups are also known as C-Spins. This name is given because of the "C" shape that is formed.

Notch
Notch is the most common Triple Double attack that is present in Multiplayer. Also, Triple Double is the best way to deal with a notch in garbage. The two basic cases are the following:

Case 1: J overhang + L triple to create  Triple Double

Case 2: Z/S overhang, L creates triple for Triple Double

Obviously, both cases have appropriate mirrors.

Other Cases:

Garbage Manipulation
302

200

Create your own notch

Note: Breaks back to back:

Single hole, clear single

2 wide hole, clear a single

Cuts

Shallow Grave

T-Spin Double Replacements
T-Spin Triple

Imperial Cross

More Imperial Cross Setups

Fractal Cave

ZST Core Perfect Clear
Discovered by player Chopin. If you can manage to get a flat 6-high-mino stack, you might have a chance to trade the T-Spin Double for a Perfect Clear.

Here are all the solutions, arranged by probability.

After 8 lines
If you cannot execute a PC after 6 lines, there still may be a chance of a PC after 8 lines.

Here are some solutions.

TOJ Core Perfect Clear
One may assemble the C-Spin Perfect Clear using the TOJ Core (TKI signature). In the second bag, O must come early.

Here are some solutions. The first 11 may result in a T-Spin Double beforehand.

Alternate way
Here is an alternative way if you cannot stack the second bag like above. This will work as long as L comes before I. The O, S and Z pieces can be placed in any order.

Here are some solutions. The first 4 may result in a T-Spin Double beforehand.

Other stacks
Here are some beneficial setups for other cores. The last two have the same solutions as the first setup.