# User:Arcorann/T-Spins

T-Spin notes.

## T kicks in SRS

Oshisaure had a table somewhere but I lost it, so here it is again. Note that CCW kicks are mirrored.

Rotation Initial state Kick 1 Kick 2 Kick 3 Kick 4 Kick 5
u, CW

impossible

r, CW
d, CW

impossible

l, CW

## Kicks that can satisfy 3-corner

Rotation Kick 1 Kick 2 Kick 3 Kick 4 Kick 5
u -> r/l Yes (either) Yes (mini) Yes (mini) n/a Yes (either)
r/l -> d Yes (either) No Yes (full) Yes (either) Yes (mini)
d -> l/r Yes (either) Yes (mini) n/a Yes (either) Yes (mini)
l/r -> u Yes (either) No Yes (mini) Yes (either) Yes (full)

Notes by kick:

• 1 is base rotation
• 2 only gives minis (sideways-pointing minis) that may or may not be immobile.
• 3 leads to the alternate way of the classic TSD kick (if going to d) and the only way to get upwards-pointing minis.
• 4 is the Iso TSD or Neo MTSD kick if going to l/r (which one depends on whether it's full or mini).
• 5 is the TST kick, but only gives TSTs if starting from u; if starting from d it is the Fin TSD kick. If l/r, it becomes another up-kick similar to 4 when starting from l/r.

### Analysis of Kick 4

The main problem is getting a piece into the location where it can kick upwards into the spot that satisfies 3-corner in either full or mini.

#### l/r -> d

We have two hypothetical setups for this kick. Adding suitable grey points to denote the four corners, we have:

from u

Mini only

n/a

Full only

from d

n/a

Inverse

Mini only

Thus, we have some new potential if largely impractical setups.

To the other setup, most of which is the same:

from u n/a

Full only

from d n/a

inverse

Thus we get similar setups to the previous case.

We can obtain the first mini single setup (from u, col. 2) by getting in through a TST kick, then soft drop, then rotating. Here is the situation after the soft drop:

Rotate left, right, right to get:

The full (from u, col. 5) also effectively uses a TST kick, and can clear one line:

The second mini setup (from d, col. 5) can't clear any lines; getting in without any extra blank squares after those indicated is possible. The inverse kick (from d, col. 4) turns out to require the exact same setup anyway.

#### l/r -> u

from u n/a (no inverse!)

Final position blocked

from d

Mini or full

n/a

Final position blocked

Final position blocked

We have one potential situation. In order to get here, though, we'd need to use either kick 4 or kick 5, which would require us to have more space below the setup, which again raises the question of how we get in to that space in the first place. An example of using kick 4 to get in -- rotate right, right, right, left from here:

For the mini spin, it's obvious we need to enter somewhere else:

For the full spin, we'd have to manoeuvre around point 1 somehow to get there:

An example of manoeuvering to get a single: once we use the TST kick to get in, soft drop, rotate left, move right, rotate right to get:

Then soft drop, rotate right, move left, rotate left, move left, soft drop, rotate right, right, right to get a t-spin single.

It is possible to get a double out of this, though. In the below setup, after the first TST kick we soft drop, rotate left, rotate left to get another TST kick.

Then rotate right, move left, rotate right, right, right to get a t-spin double.

### Analysis of Kick 5

#### l/r -> d

Again, two setups; this can only give mini. Note that in either setup we can simply move pieces downward to get the piece into position.

Setup 1:

from u n/a
from d n/a

inverse

Setup 2:

from u n/a
from d n/a

inverse

#### l/r -> u

This one is full only. Again, we can get the T into position for the last kick through just moving downward:

from u n/a

inverse

from d n/a

So in this case we have a few possibilities as well.

## Test cases

The minimum required to satisfy all rules is 3-corner with pointing side and the back of the T not facing a wall or floor.

Brackets indicate an unverified entry.

Before After Lines Imm? 3-c? Pnt? Kick? TST kick? Back? T.com TF NewT TW DS NC TZ TOJ TPD TTw Notes
Classic TSD
2 Yes Yes Yes No No Empty Full Full Yes Yes Full Full Full Full Full
1 Yes Yes Yes No No Empty Full Full (Yes) Yes Full _ _ _ Full
1 Yes Yes No No No Empty Mini _ _ Yes Full _ _ _ Mini
1 No Yes No No No Empty Mini _ _ Yes Full _ _ _ Mini
2 Yes Yes Yes Yes (3) No Empty Full _ _ Yes Full _ _ _ Full
TSS from classic TSD setup
1 Yes Yes Yes No No Empty Full _ _ _ Full _ _ _ Full
1 Yes Yes Yes No No Empty Full _ _ _ Full _ _ _ Full
1 Yes Yes Yes Yes (3) No Empty Full _ _ _ Full _ _ _ Full
1 Yes Yes Yes Yes (3) No Empty Full _ _ _ Full _ _ _ Full
Upward-pointing Mini TSS
1 Yes Yes No Yes (3) No Floor Mini _ _ _ Mini _ _ _ Mini
1 Yes Yes No Yes (3) No Block Mini _ _ _ Mini _ _ _ Mini
1 Yes Yes No Yes (3) No Empty Mini _ _ _ Mini _ _ _ Mini
Sideways-pointing Mini TSS
1 Yes Yes No Yes (2) No Block Mini _ _ _ Mini _ _ _ Mini
1 Yes Yes No Yes (2) No Empty Mini _ _ _ Mini _ _ _ Mini
1 Yes Yes No Yes (2) No Wall Mini _ _ _ Mini _ _ _ Mini
TST-kick setups
3 Yes Yes Yes Yes (5) Yes Block Full Full _ _ Full
2 Yes Yes Yes Yes (5) Yes Block Full Full _ _ Full
1 Yes Yes Yes Yes (5) Yes Block Full Full _ _ Mini _ _ _ Full
2 Yes Yes No Yes (5) Yes Block Full _ _ _ Full _ _ _ Full
1 Yes Yes No Yes (5) Yes Block _ _ _ _ Mini _ _ _ Full
2 Yes Yes Yes Yes (5) Yes Hole Full _ _ _ _ Full
1 Yes Yes Yes Yes (5) Yes Hole Full _ _ _ _ Mini
1 Yes Yes No Yes (5) Yes Hole Full _ _ _ _ Mini
3 Yes Yes Yes Yes (5) Yes Wall Full _ _ _ _ Full
TST-kick chaining setups
1 Yes Yes No Chain Chain Empty Full _ _ _ _ Full
1 Yes Yes No Yes (3) Chain Floor Mini _ _ _ _ Mini
2 Yes Yes No Yes (3) Chain Block (Mini) _ _ _ _ Full
2 Yes Yes No Yes (3) Chain Wall (*1) _ _ _ _ Full
1 Yes Yes No Yes (2) Chain Block
1 Yes Yes No Yes (2) Chain Empty
1 Yes Yes No Yes (2) Chain Wall
Neo MTSD-like
2 No Yes No Yes (4) No Block (*1) _ n/a _ Full _ _ _ Mini (*2)
1 No Yes No Yes (4) No Block No _ _ _ Mini _ _ _ Mini
1 No Yes No Yes (4) No Empty No _ _ _ Mini _ _ _ Mini
Fin TSD-like
2 No Yes No Yes (5) Yes Block Full _ _ _ Full _ _ _ Full
1 No Yes No Yes (5) Yes Block Full _ _ _ Mini _ _ _ Full
1 No Yes No Yes (5) Yes Empty
1 No Yes No Yes (5) Yes Wall
Reverse TST kicks

The following list some mishandlings of weird kicks:

• Tetris.com (*1): 2 lines, 0 points, does not begin or break back-to-back
• Tetris Twist (*2): 2 lines, 200 points, treated as Mini T-Spin Single

Tetris.com also does not recognise singles from the Neo TSD kick, it seems...