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 Neo MTSD kick if going to d. If going to u, mini is also possible. It's not clear if there's a legal setup for getting full 3-corner with the kick going to either d or u (doesn't look like it).
• 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 (but can we get here?)	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 in the first place. Probably won't be able to clear lines with this (certainly not for a mini spin). In any case, rotate right, right, right, left from here:

For the full spin, we'd have to manoeuvre around point 1 somehow to get there, which probably precludes any doubles.

An example of manoeuvering: 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.

Analysis of Kick 5

l/r -> d

Again, two setups; this can only give mini. Adding grey corners:

from u				n/a
from d			n/a

from u				n/a
from d			n/a

l/r -> u

This one is full only.

from u				n/a	inverse
from d			n/a

So in this case only the inverse works.

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
		1	Yes	Yes	Yes	No	No	Empty	_	_	_	_	Full	_	_	_	Full
		1	Yes	Yes	Yes	Yes (3)	No	Empty	_	_	_	_	Full	_	_	_	Full
		1	Yes	Yes	Yes	Yes (3)	No	Empty	_	_	_	_	Full	_	_	_	Full
Upward-pointing Mini TSS
		1	Yes	Yes	No	Yes (3)	No	Floor	_	_	_	_	Mini	_	_	_	Mini
		1	Yes	Yes	No	Yes (3)	No	Block	_	_	_	_	Mini	_	_	_	Mini
		1	Yes	Yes	No	Yes (3)	No	Empty	_	_	_	_	Mini	_	_	_	Mini
Sideways-pointing Mini TSS
		1	Yes	Yes	No	Yes (2)	No	Block	_	_	_	_	Mini	_	_	_	Mini
		1	Yes	Yes	No	Yes (2)	No	Empty	_	_	_	_	Mini	_	_	_	Mini
		1	Yes	Yes	No	Yes (2)	No	Wall	_	_	_	_	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
		2	Yes	Yes	No	Yes (5)	Yes	Block	_	_	_	_	Full
		1	Yes	Yes	No	Yes (5)	Yes	Block	_	_	_	_	Mini
		2	Yes	Yes	Yes	Yes (5)	Yes	Hole
		1	Yes	Yes	Yes	Yes (5)	Yes	Hole
		1	Yes	Yes	No	Yes (5)	Yes	Hole	Full
		3	Yes	Yes	Yes	Yes (5)	Yes	Wall
TST-kick chaining setups
		1	Yes	Yes	No	Chain	Chain	Empty	Full
		1	Yes	Yes	No	Yes (3)	Chain	Floor	Mini
		2	Yes	Yes	No	Yes (3)	Chain	Block	(Mini)
		2	Yes	Yes	No	Yes (3)	Chain	Wall	(Mini)
		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	_	_	_	_	Mini	_	_	_	Mini
		1	No	Yes	No	Yes (4)	No	Empty	_	_	_	_	_	_	_	_	Mini
Fin TSD-like
		2	No	Yes	No	Yes (5)	Yes	Block	_	_	_	_	Full	_	_	_	Full
		1	No	Yes	No	Yes (5)	Yes	Block	_	_	_	_	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 MTSDs:

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

Setups

Links

• What a T-Spin Mini is and why they are so confusing - has some edge cases