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 does not waste any T's, the rate of success is extremely high, and that it starts the B2B early. It is also a good way to counter Center 4-Wide openings.

Mirrored Alternative to Mr T-Spin's STD
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 does not 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 39.29% 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.

These four 4th bag placements (found by 10Penta) cover every 4th bag:

Avoid the I<S setups if possible.

First Setup
You can also do an STSD with a 58.3% chance to end with a Perfect Clear after 14 lines.

Here are all solutions. The first 3 may result with a T-Spin Double beforehand.

You can also stack the fourth bag this way. The Perfect Clear rate is 96.98% (7 solutions).

Here is a similar setup. However, there is one more dependency: L before O. The Perfect Clear rate is 74.84% (5 solutions).

Second Setup
There is also another way to set up an STSD which could end with up to 100% chance of getting a 14th row Perfect Clear. This setup was discovered by the player CaptainCream.

In the third bag, the S, J, L and I on the 3rd bag can be stacked in one of the following three ways:

If L comes before O on the 4th bag, making the first 4th bag pattern is possible. This pattern has 93.23% chance of Perfect Clear. If T comes first on the 5th bag, the chance increases to 100%. There is also a slight chance that T-Spin Double, Tetris and Perfect Clear could be done in the same bag.

16 solutions; 7 are shown (Both T-Spin Double and Tetris could be done on the second Perfect Clear pattern). [https://harddrop.com/fumen/?d115@pgC8zhAtRpC8ilBtRpC8glR4Ati0C8R4D8g0B8ywH8?wwF8JeAgWaA0CoABFbcRAyv78Aw3CwBFbEwCzvaFDM+AAAp?gC8whili0C8whglAtRpQ4g0C8whBtRpR4C8whAtD8Q4B8yw?H8wwF8JeAAPaAzCgRBFbcRAyv78Aw3CwBFbEwCTnbMCqCBA?ApgC8g0BtQ4hlwhC8i0R4glwhC8RpBtQ4glwhC8RpD8whB8?ywH8wwF8JeAAPaAz8nABFbcRAyv78Aw3CwBFbEwCPuTWCqX?BAApgC8zhAtR4C8i0BthlC8Rpg0AtR4glC8RpD8glB8ywH8?wwF8JeAAPaAz53UBFbcRAyv78Aw3CwBFbEwCvizPCT+AAAp?gC8zhAthlC8i0BtR4C8Rpg0AtR4glC8RpD8glB8ywH8wwF8?JeAAPaAyCIOBFbcRAyv78Aw3CwBFbEwCPtzPCM+AAApgC8B?tR4RpwhC8glBtg0RpwhC8glR4i0whC8hlD8whB8ywH8wwF8?JeAAPaAy535AFbcRAyv78Aw3CwBFbEwCp/LgCaNBAApgC8R?pBti0C8ilBtQ4g0C8glzhR4C8RpD8Q4B8ywH8wwF8JeAAPa?AS4XHBFbcRAyv78Aw3CwBFbEwCTejWCKHBAApgC8zhAtRpC?8ilBtRpC8ywAti0C8R4D8g0B8R4wwH8glF8JeAAPaAS4P9A?FbcRAyv78Aw3CwBFbssCq+aFDM+AAApgC8whywi0C8BtwwR?pQ4g0C8whBtRpR4C8whglD8Q4B8ilH8whF8JeAAPaAx/35A?FbcRAyv78Aw3CwBFbEVCTnzPCU+AAApgC8ywQ4i0C8whBtR?4RpC8whwwBtQ4RpC8whglD8g0B8ilH8whF8JeAAPaAR+nAB?FbcRAyv78Aw3CwBFbEVCJnLuC0/AAApgC8h0AtRphlC8g0B?tRpwwglC8zhywC8R4D8glB8R4AtH8g0F8JeAAPaAx8HOBFb?cRAyv78Aw3CwBFbssCU+TFDKHBAApgC8ilRpg0whC8Q4BtR?pg0whC8R4Bth0whC8wwQ4D8whB8ywH8glF8JeAAPaAx5/DB?FbcRAyv78Aw3CwBFbEwCJtzPCvCBAApgC8whBtQ4i0C8ywR?4RpC8whwwBtQ4RpC8whglD8g0B8ilH8whF8JeAAPZAZlnRA?So78A1no2AlsCSASYLgCzeNFDqAAAApgC8whBtRphlC8whh?0RpR4C8whg0BtR4glC8whg0D8glB8ywH8wwF8JeAAPZAZ1g?RASo78A1no2AlsCSASY9tCKuKWC6AAAApgC8whh0RpR4C8w?hBtRphlC8whg0BtR4glC8whg0D8glB8ywH8wwF8JeAAPZAX?1pRASo78A1no2AlsCSASYVWCauytCqAAAApgC8zhywC8h0A?tRphlC8g0BtRpwwglC8R4D8glB8R4AtH8g0F8JeAAPZAVFs?RASo78A1no2AlsCSASITWC6vKxCpAAAA All solutions].

If O comes before L on the 4th bag, making the second 4th bag pattern is possible. This pattern has 76.51% chance of Perfect Clear. All solutions.

8 solutions; 4 shown

If I comes very late and both L and O comes early, making the third 4th bag pattern is possible. This pattern was found by a Japanese Person. This pattern has a 50.95% chance of Perfect Clear. All Solutions

2 solutions

Mr. T-Spin Analogon
The left and right parts are 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, the O, S and Z are 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.

One can also arrange the pieces like this, which results in a 58.49% chance of Perfect Clear.

Here are two more ways how the second bag can be stacked, if the I piece is placed in its usual spot. Neither method results in a Perfect Clear chance.

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