Number One

Number One is a T-Spin Opener invented by Riviclia. Here, the T piece is spun vertically like in STSD.

After the T-Spin Double
After the T-Spin Double, there is a floating block at row 2, column 9. With SRS spins, it is possible to fill in the surrounding empty space and make another TSD. Some examples:



Some advanced techniques:

6-line PC
If one can stack the right side like in the leftmost diagram, there may be a chance for a Perfect Clear after 6 lines. Sometimes, one does a TSS before the PC. There is no way to get a PC with a TSD. First invented by MalaiABUeditor.

If one gets an early I in their third bag, the below stack may work, but has piece several dependencies, so the above is better.

TST TSD Perfect Clear
This Perfect Clear continuation is stacked like a T-Spin Triple, but with a gap. There are two paths, the first path involves the J piece vertically (diagram 2) and the other path involves the J piece horizontally (diagram 3).




 * Path 1: 98.17%




 * Path 2: 90.4%



If one decides not to make a Perfect Clear, they can convert the TSD to a T-Spin Triple or Imperial Cross. Below are examples.

Imperial Cross Perfect Clear
This continuation is an Imperial Cross for a Perfect Clear. Again, there are two paths, the first path involves the L piece being spun (diagram 3) and the other path involves the Z piece being spun (diagram 2).




 * Path 3: 80.48%




 * Path 4: 80.28%



Again, if one decides not to make a Perfect Clear, they can convert the TSD to a T-Spin Triple or Imperial Cross. Below are examples.

After 14 lines
When it comes to 14 lines, there is no definite way. Below is an example, with an Imperial Cross in the second bag.