Mr. T-Spin's STD

This is an opening created by player Mr. T-Spin. STD stands for Single Triple Double which notes how many lines are cleared by the corresponding T-Spins. It is efficient in the sense that it doesn't waste any T's, the rate of success is extremely high, and that it starts the B2B early. It's also a good way to counter Center 4-Wide openings.

= Mr. T-Spin's Single-Triple-Double =

Mirrored Alternative to Mr Tspin
In the event that you get a late J, consider this:

OSZ in Second Bag
The O,S and Z pieces in the second bag can always be stacked in a way that a T-Spin Triple is prepared at the end of the bag. The order of the pieces in the second bag doesn't matter at all - the stack will always look the same at the beginning of the third bag.

Perfect Clear chance
If J piece comes late in the second bag, then the positions of O piece and J piece can be swapped that means the O piece is used to build the overhang. This results in a small Perfect Clear chance after 8 cleared lines (3 bags) whereas only a T-Spin Single is made in the third bag.

Here are some further patterns to achieve the Perfect Clear. One of those 6 patterns will be applicable for 39.3 % of all third bags.

Nosomi Continuation
Like previously mentioned, the stack will always look the same after 2 placed bags. With this continuation discovered by the player Nosomi, even the third bag can be placed in the same way, whereas a T-Spin Single is made in the third bag instead of the usual T-Spin Double. The Z piece stays on hold until the end of the bag and is then used to prepare a DT Cannon. Altogether, the following T-Spins are made in the first 5 bags: Single -> Triple -> Single -> Double -> Triple.

Disadvantage of the technique is that you may have to softdrop the O piece during the third bag; or make a tricky twist to get the T piece in place, if the S piece was already placed: First you rotate by 180 degrees, then you softdrop a row, rotate in an arbitrary direction (the T piece will be kicked) and rotate back in the other direction.

Here are some alternative ways how to place the fourth bag:

= Other T-Spin Single Triple Double Openings =

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,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's 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 can't 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's 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's 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 a STD. Not really useful.