Single Triple Double

Single Triple Double are setups that starts with a T-Spin Single in the first bag, a T-Spin Triple in the second bag, and a T-Spin Double in the third bag.

Mr T-Spin Analogon
Left and right part swapped, so the T-Spin Triple overhang points towards the wall. This opening has the same dependencies as Mr. T-Spin's STD in the first bag (must place O before I and Z before L), and in the second bag O, S and Z must be stacked in the same way. After the execution, the only real difference is that the T-Spin Triple overhang points towards the closer wall which will result in different leftovers.

If I piece comes last in first bag, one can also drop it on the wall which allows to stack the T-Spin Triple overhang differently.

Here are some ways how the second bag can be stacked, if the I piece is placed in its usual spot. None of them result in a Perfect Clear chance.

To prevent that vertical L-piece overhang, it is sometimes possible to keep the L piece on hold and use J-piece from the third bag in its place.

Pokemino's STD
Almost every game can be started with this opening. The only dependency in the first bag is that J must be placed before Z (respectively L before S in the mirrored setup). In contrast to Mr. T-Spin's STD it is not possible to make a T-Spin Triple at the end of the second bag every time. The dependency is quite high in the second bag, that I must come before Z and O must come before J.

In the likely case that the overhang cannot be completed with the second bag, the following stack is well suited for most third bags.

Hopefully, S or Z show up before T in third bag, so that no T piece must be wasted. Otherwise, it is also possible to spin in the T-piece to get a T-Spin Double, then stack an overhang on the left side to make a T-Spin Single with the third T-piece, and finally the T-Spin Double from the STD in the fourth bag.

Early I-Piece
This setup has many dependencies in the first bag and the T-Spin Triple is not guaranteed in the second bag in which case it is hard to stack an alternative. Thus this setup is not really useful.

However, if the second bag can be placed like above, then there is a Perfect Clear opportunity after 8 cleared lines. One of the following patterns will work for 64.7 % of all third bags and in any case a T-Spin (Single or Double) is made beforehand.

Here are some further ways to get a T-Spin Triple in the second bag. None of them offers a Perfect Clear chance (actually the fourth one does but not with a T-Spin beforehand).

T-Spin Mini Zero 【JD砲】
This setup starts with a T-Spin Mini that clears no line. Afterwards it goes for an STD. Not really useful.