Short for Super T-Spin Double. This setup yields 2 T-Spin Doubles.
Most STSDs are built by recognizing a 3-column, 3-row empty space and then placing a J/L in it.
The J and L combination shown in the first picture below is the most common way to build it because you just have to check if J and L is in your queue, but the overhang can be built in different ways.
You can build STSDs over existing Tetris columns:
STSD can be used as a recovery technique when you misdrop your J/L:
Using S/Z requires taking a closer look at your next pieces because you need to place another mino on top of S/Z to complete your setup.
You can build STSDs over open columns long as you have blocks indicated as green for your base:
If one of them is missing, you won't be able to make any TSDs.
These situations often happen when you receive garbage rows with the open column immediately underneath that is unfortunately on a bad spot.
Note: An exception to this rule would be deliberately setting this up in anticipation of a tetris.
However, you can salvage the above field by spinning in an L or a J depending on your setup. This technique is called Boomerang.
Note: One way to fix the bad overhang above is to build a TD
An STSD stacked on top of a TSD. There are two forms. Trinities are often converted from a TSD when you don't anticipate getting a T piece soon.
Compare this form of Trinity with how you would convert a TSD into a DT Cannon:
This form is a less common way to build Trinity but is equally as useful.
If you feel safe delaying your attack for one bag, converting the second TSD into a double TST would be a good way to spike your opponent. Works best when you have already stacked up the right part. This opportunity most commonly arises when you use S as the overhang.
Similarly, the second TSD can be converted into a TST.
3連TSD. A setup that looks similar to DT Cannon. However, this setup forms an STSD after the first TSD. As its Japanese name implies, this setup yields 3 TSDs.
Refer to the DT Cannon page to learn more about this setup.
A setup that looks similar to BT Cannon. However, this setup forms an STSD after the first TSD. Like DT STSD, this setup yields 3 TSDs.
Refer to the BT Cannon page to learn more about this setup.
STSDs can be stacked on top of one another. Not very practical to use in a real game unless you somehow get more than 4 Ts in a row (impossible).
As an aside, these patterns can be used to create baseless STSDs.
Baseless STSDs can be a way to fix a TSD with a bad overhang:
キングクリムゾン. King Crimson is a TST built on top of an STSD. Seldomly used.
This technique would be one way to fix a field like the third picture below formed after a TST like the one shown in the first picture below. Building a King Crimson, in this case, would not be recommended because you would be using a lot of Ts on your stack while building a setup that will use 3 Ts:
A better way would be to fix the above field would be sliding in an L.
The lines cleared in the first TSD are marked yellow, and the lines cleared in the second TSD are marked orange. Because blocks in the second TSD can be filled in later, you can incorporate donation techniques for the first TSD.
Once you become familiar with the lines that the STSD itself clears, you can consider donating with STSD as a whole. Some examples: