T-Spin: Difference between revisions

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Some games give scoring rewards for twisting a tetromino into a tight space. When this is done with a T tetromino, it is called a '''T-spin'''.
Modern ''Tetris'' games reward the player for twisting the T tetrimino into a tight space. This kind of move is called '''T-spin'''.


Two basic algorithms, with slight variations, have been used in newer games to detect and reward in-place spins:
== Current rules ==
*Immobile, used in ''[[The New Tetris]]'': A twist is recognised if a tetromino locks in a position where it cannot move left, right, or up. There is only [[The_New_Tetris#Twist_reward|a reward]] if rows are completed in this way. Example:
 
T-spins are detected and rewarded upon the locking of a T tetrimino. The mechanism can be described as follows:
 
* The last maneuver of the T tetrimino must be a rotation.
* If there are two minoes in the front corners of the 3 by 3 square occupied by the T (the front corners are ones next to the sticking out mino of the T) and at least one mino in the two other corners (to the back), it is a "proper" T-spin.
* Otherwise, if there is only one mino in two front corners and two minoes to the back corners, it is a Mini T-spin. However, if the last rotation that kicked the T moves its center 1 by 2 blocks (the last rotation offset of [[Super Rotation System|SRS]]), it is still a proper T-spin.


{|
{|
|<playfield>
|<playfield>
......GG..
.....TGG..
GGGG...GGG
...GTT.GG.
GGGG..GGGG
GGGGGTGGGG
</playfield>
</playfield>
Immobile T-slot
|<playfield>
|<playfield>
.....TGG..
....--SG..
GGGGTT.GGG
...GTTTGG.
GGGG.TGGGG
GGGGSTSGGG
</playfield>
</playfield>
Entry
|<playfield>
|<playfield>
..........
......GG..
......GG..
GGGGTTTGGG
...GTTTGG.
GGGG.TGGGG
</playfield>
</playfield>
Rotated to a position of immobility, and a row will clear
|- style="vertical-align: top;"
| A T is dropped.
| Three corners are<br>detected, two to<br>the front.
| T-spin single.
|}
|}


*3-corner T, used in ''[[Tetris DS]]'' and other [[SRS]] based games: A T-spin bonus is awarded if all of the following are true:<sup>[http://www.tetrisconcept.com/forum/viewtopic.php?t=78]</sup>
{|
*#Tetromino being locked is T.
|<playfield>
*#Last successful movement of the tetromino was a rotate, as opposed to sideways movement, downward movement, or falling due to gravity. (Canceling lock delay in games that allow it, such as Tetris DS, does not count as a movement.) The tetromino doesn't even have to end up in a different orientation than it was dropped in; setting up the "well-known twist" below in ''Tetris Worlds'' or ''Tetris DS'' and pressing both rotate buttons (B&ndash;A or A&ndash;B) will trigger the T-spin bonus even without any net rotation.
.......T.G
*#Three of the 4 squares diagonally adjacent to the T's center are occupied. In ''Tetris DS'', the walls and floor surrounding the playfield are considered "occupied", while in ''[[Tetris Worlds]]'' for GBA, they aren't. Example:
....GGTTGG
GGGGG..TGG
GGGGGGGGG.
</playfield>
|<playfield>
.........G
....GST-GG
GGGGGTTTGG
GGGGGSGSG.
</playfield>
|<playfield>
..........
.........G
....GGT.GG
GGGGGGGGG.
</playfield>
|- style="vertical-align: top;"
| Another T.
| Three corners are<br>detected, but two<br>are to the back.
| Mini T-spin single.
|}


{|
{|
|<playfield>
|<playfield>
......GG..
.......TGG
GGGG...GGG
......TTTG
GGGGG.GGGG
GGGGGGGG.G
GGGGGGG..G
GGGGGGG..G
</playfield>
</playfield>
3-corner T-slot
|<playfield>
|<playfield>
.....TGG..
........GG
GGGGTC.GGG
.........G
GGGGGTGGGG
GGGGGGGSTS
GGGGGGGTTG
GGGGGGG-TS
</playfield>
</playfield>
Entry
|<playfield>
|<playfield>
......BG..
..........
GGGGTCTGGG
..........
GGGGBTBGGG
........GG
.........G
GGGGGGG.TG
</playfield>
</playfield>
Rotated and 3 corners are occupied in the 3x3 box which contains the T
|- style="vertical-align: top;"
| Yet another T.
| Two corners are<br>to the back, but<br>the rotation brought<br>the T's center 2 blocks<br>down, 1 block right.
| T-spin double.
|}
|}


[[Guideline compliant game differences|Different games]] add further restrictions:
If the T is facing against a wall or floor, the two back corners are considered as if there were minoes there.
*3-corner T no wall, used in ''[[Tetris Worlds]]'': The walls and floor surrounding the playfield are not considered "occupied". This means that if a wall kick places the T tetromino with its flat side against the wall or floor, the T-spin will not be recognized. (Kicks that place the flat side against blocks in the playfield still work.)
*3-corner T no kick, used in ''[[Tetris: New Century]]'', ''[[iPod Tetris]]'', ''[[Tetris Evolution]]'', and most other official guideline games released after 2006: The final rotation must not involve a wall kick, that is, it recognizes only the "well known twist" below.
*[[Tetris Zone]] recognises T-spins that involve a wallkick, but will not recognise any T-spin that results in a triple.


== Rewards ==
This mechanism of detection has some scenarios that do not quite make sense as "twisting the T into tight space" but it still rewards them anyway. Some of them are as follows.
Rewards for T-spins first appeared in ''[[The New Tetris]]''. The game added a reward for T-spins (and for twists involving other pieces), which would trigger an "avalanche." [[Henk Rogers]] implied in his planetgamecube.com interview that it was the mobile game ''[[Tetris Battle]]'' that inspired the T-Spin's current dominating points and garbage rewards, although T-Spins in a nerfed form found their way into prior guideline games such as ''[[Tetris Worlds]]''. As of 2008, the [[Tetris Guideline]] seems to favor the 3-corner T no kick rulings.


A couple of 3-corner T no kick rulings variations:
{|
{|
|<playfield>
|<playfield>
.....TGG..
B.T........B
GGGGTC.GGG
BTTT.......B
GGGGGTGGGG
B.GGGGGGGGGB
BBBBBBBBBBBB
</playfield>
|<playfield>
ST-........B
BTT........B
STSGGGGGGGGB
BBBBBBBBBBBB
</playfield>
</playfield>
Soft drop
|<playfield>
|<playfield>
......GG..
B..........B
GGGGTCTGGG
BT.........B
GGGGGTGGGG
BTT........B
BBBBBBBBBBBB
</playfield>
</playfield>
Rotate left
|- style="vertical-align: top;"
| T on the stack.<br>(Black minos represent<br>the playfield's walls<br>and floors.)
| Three corners are<br>detected, but is<br>this a twist?
| Yes, it still is.<br>Mini T-spin single.
|}
|}
{|
{|
|<playfield>
|<playfield>
.....TGG..
.....TGG..
....TC.GGG
...GTT.GG.
GGGGGTGGGG
GGGGGTGGGG
</playfield>
</playfield>
Soft drop
|<playfield>
|<playfield>
......GG..
......GG..
....TCTGGG
...GTTTGG.
GGGGGTGGGG
GGGGGTGGGG
</playfield>
</playfield>
Rotate once
|<playfield>
|<playfield>
....-TSG..
...GTT-GG.
GGGGSTSGGG
</playfield>
|<playfield>
..........
.....TGG..
.....TGG..
.....CTGGG
...GTT.GG.
GGGGGTGGGG
</playfield>
</playfield>
Or twice
|- style="vertical-align: top;"
| Same board<br>as the first.
| Rotate like this...
| but then immediately<br>rotate it back.
| Mini T-spin single.
|}
|}


[[Category:Mobility]]
=== Rewards ===
 
==== Scoring ====
 
{{Main|Scoring#Recent guideline compatible games}}
 
The amount of score awarded for a T-spin depends on the number of lines cleared using it and whether it is Mini.
 
{| class="wikitable"
|-
! Lines !! Mini T-spin !! T-spin
|-
| 0 || 100 || 400
|-
| 1 || 200 || 800
|-
| 2 || 400 || 1200
|-
| 3 || [Impossible.] || 1600
|}
 
The score is then further multiplied by the level and back-to-back bonus.
 
Any T-spin that clears lines, whether Mini or not, is considered "difficult" and will trigger back-to-back. T-spins that clear no lines, however, don't break the back-to-back chain. Also, on tetris.com, '''vertical''' TSMDs give no points, will give the lines, but the line goal is +2 multiplied by times performed.
 
==== In battles ====
 
T-spins usually send garbage to opponents. T-spin doubles are at least as powerful as a Tetris and are commonly sought after in battles, while T-spin triples are even scarier. Various [[:Category:T-Spin setups|setups]] have been created to create opportunities for T-spins and utilize them as much as possible.
 
== Other rules ==
 
=== Immobile ===
 
In ''[[The New Tetris]]'', T-spins are recognized if the T tetrimino cannot move in any direction when locking. There is only a reward if rows are completed this way.
 
=== Three-corner variants ===
 
* ''[[Tetris Worlds]]'' doesn't recognize rotations resulting in the T laying against a wall or the floor as a T-spin.
* ''[[Tetris: New Century]]'', ''[[iPod Tetris]]'', ''[[Tetris Evolution]]'',... only recognize T-spins without kicking, i.e. the last rotation of the T must be in-place.
* ''[[Tetris Zone]]'' does not recognize T-spin triples.
 
=== Lenient ===
 
''[[Tetris The Grand Master 3 Terror-Instinct|Tetris the Grand Master 3: Terror-Instinct]]'' declares a "T-SPIN!" simply if the last movement of a T is rotation when clearing lines.
 
 
[[Category:Gameplay]]

Latest revision as of 20:28, 1 January 2023

Modern Tetris games reward the player for twisting the T tetrimino into a tight space. This kind of move is called T-spin.

Current rules

T-spins are detected and rewarded upon the locking of a T tetrimino. The mechanism can be described as follows:

  • The last maneuver of the T tetrimino must be a rotation.
  • If there are two minoes in the front corners of the 3 by 3 square occupied by the T (the front corners are ones next to the sticking out mino of the T) and at least one mino in the two other corners (to the back), it is a "proper" T-spin.
  • Otherwise, if there is only one mino in two front corners and two minoes to the back corners, it is a Mini T-spin. However, if the last rotation that kicked the T moves its center 1 by 2 blocks (the last rotation offset of SRS), it is still a proper T-spin.
.....TGG..
...GTT.GG.
GGGGGTGGGG
....--SG..
...GTTTGG.
GGGGSTSGGG
..........
......GG..
...GTTTGG.
A T is dropped. Three corners are
detected, two to
the front. 		T-spin single.
.......T.G
....GGTTGG
GGGGG..TGG
GGGGGGGGG.
.........G
....GST-GG
GGGGGTTTGG
GGGGGSGSG.
..........
.........G
....GGT.GG
GGGGGGGGG.
Another T. Three corners are
detected, but two
are to the back. 		Mini T-spin single.
.......TGG
......TTTG
GGGGGGGG.G
GGGGGGG..G
GGGGGGG..G
........GG
.........G
GGGGGGGSTS
GGGGGGGTTG
GGGGGGG-TS
..........
..........
........GG
.........G
GGGGGGG.TG
Yet another T. Two corners are
to the back, but
the rotation brought
the T's center 2 blocks
down, 1 block right. 		T-spin double.

If the T is facing against a wall or floor, the two back corners are considered as if there were minoes there.

This mechanism of detection has some scenarios that do not quite make sense as "twisting the T into tight space" but it still rewards them anyway. Some of them are as follows.

B.T........B
BTTT.......B
B.GGGGGGGGGB
BBBBBBBBBBBB
ST-........B
BTT........B
STSGGGGGGGGB
BBBBBBBBBBBB
B..........B
BT.........B
BTT........B
BBBBBBBBBBBB
T on the stack.
(Black minos represent
the playfield's walls
and floors.) 		Three corners are
detected, but is
this a twist? 		Yes, it still is.
Mini T-spin single.
.....TGG..
...GTT.GG.
GGGGGTGGGG
......GG..
...GTTTGG.
GGGGGTGGGG
....-TSG..
...GTT-GG.
GGGGSTSGGG
..........
.....TGG..
...GTT.GG.
Same board
as the first. 		Rotate like this... but then immediately
rotate it back. 		Mini T-spin single.

Rewards

Scoring

Main article: Scoring#Recent guideline compatible games

The amount of score awarded for a T-spin depends on the number of lines cleared using it and whether it is Mini.

Lines Mini T-spin T-spin
0 100 400
1 200 800
2 400 1200
3 [Impossible.] 1600

The score is then further multiplied by the level and back-to-back bonus.

Any T-spin that clears lines, whether Mini or not, is considered "difficult" and will trigger back-to-back. T-spins that clear no lines, however, don't break the back-to-back chain. Also, on tetris.com, vertical TSMDs give no points, will give the lines, but the line goal is +2 multiplied by times performed.

In battles

T-spins usually send garbage to opponents. T-spin doubles are at least as powerful as a Tetris and are commonly sought after in battles, while T-spin triples are even scarier. Various setups have been created to create opportunities for T-spins and utilize them as much as possible.

Other rules

Immobile

In The New Tetris, T-spins are recognized if the T tetrimino cannot move in any direction when locking. There is only a reward if rows are completed this way.

Three-corner variants

Lenient

Tetris the Grand Master 3: Terror-Instinct declares a "T-SPIN!" simply if the last movement of a T is rotation when clearing lines.

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