I-Spins in SRS: Difference between revisions

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Different [[rotation system]]s that approximate [[SRS]] apply different [[wall kick]]s and [[floor kick]]s when the player [[twist]]s the I [[tetromino]].
Different [[rotation system]]s that approximate [[SRS]] apply different [[wall kick]]s and [[floor kick]]s when the player [[twist]]s the I [[tetromino]].


== Official SRS ==
== Guideline SRS ==
[[Tetris Worlds]], [[Tetris DS]] and [[Tetris The Grand Master Ace]] are based on the [[Tetris Guideline]], including SRS. They have the following behavior:
Games such as [[Tetris Worlds]] and [[Tetris DS]] are based on the [[Tetris Guideline]], including SRS. They have the following behavior:
{|  
{|  
|valign="top"|{{pfstart}}
|valign="top"|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |i|i|i|i| | | }}
...IIII...
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |g| | |s|s| | }}
...G..SS..
{{pfrow| | | |g| |s|s|j|j|j}}
...G.SSJJJ
{{pfrow| | | |g| | | | | |j}}
...G.....J
{{pfend}}
</playfield>
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |g| | |s|s| | }}
...G..SS..
{{pfrow| | | |g| |s|s|j|j|j}}
...G.SSJJJ
{{pfrow| | | |g| | | | | |j}}
...G.....J
{{pfend}}
</playfield>
Rotated left
Rotated left
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | |g|i| |s|s| | }}
...GI.SS..
{{pfrow| | | |g|i|s|s|j|j|j}}
...GISSJJJ
{{pfrow| | | |g|i| | | | |j}}
...GI....J
{{pfend}}
</playfield>
Soft dropped
Soft dropped
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |g| | |s|s| | }}
...G..SS..
{{pfrow| | | |g| |s|s|j|j|j}}
...G.SSJJJ
{{pfrow| | | |g|i|i|i|i| |j}}
...GIIII.J
{{pfend}}
</playfield>
Rotated right
Rotated right
|}
|}


But the wall kicks are not symmetric, as Tetris Worlds, Tetris Deluxe, Tetris DS and Tetris The Grand Master Ace prefer to kick up rather than down when rotating left:
But the wall kicks are not symmetric, as the kick up is performed in preference to the kick down when rotating left:
{|
{|
|valign="top"|{{pfstart}}
|valign="top"|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |i|i|i|i| | | }}
...IIII...
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| | | | | |t| | | }}
L.....T...
{{pfend}}
</playfield>
|{{pfstart}}
|<playfield>
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| | | | | |t| | | }}
L.....T...
{{pfend}}
</playfield>
Rotated right
Rotated right
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | |z|z| |i|t| | | }}
..ZZ.IT...
{{pfrow|l|l|l|z|z|i|t|t| | }}
LLLZZITT..
{{pfrow|l| | | | |i|t| | | }}
L....IT...
{{pfend}}
</playfield>
Soft dropped
Soft dropped
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | |i|i|i|i| }}
.....IIII.
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| | | | | |t| | | }}
L.....T...
{{pfend}}
</playfield>
Rotated left
Rotated left
|}
|}
Line 109: Line 109:
However, an extra block impedes the choice of the upward kick position:
However, an extra block impedes the choice of the upward kick position:
{|
{|
|valign="top"|{{pfstart}}
|valign="top"|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |i|i|i|i| | | }}
...IIII...
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | |g| }}
........G.
{{pfrow| | |z|z| | |g| | | }}
..ZZ..G...
{{pfrow|l|l|l|z|z| |g| | | }}
LLLZZ.G...
{{pfrow|l| | | | | |g| | | }}
L.....G...
{{pfend}}
</playfield>
|{{pfstart}}
|<playfield>
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | |g| }}
........G.
{{pfrow| | |z|z| | |g| | | }}
..ZZ..G...
{{pfrow|l|l|l|z|z| |g| | | }}
LLLZZ.G...
{{pfrow|l| | | | | |g| | | }}
L.....G...
{{pfend}}
</playfield>
Rotated right
Rotated right
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | |i| | |g| }}
.....I..G.
{{pfrow| | |z|z| |i|g| | | }}
..ZZ.IG...
{{pfrow|l|l|l|z|z|i|g| | | }}
LLLZZIG...
{{pfrow|l| | | | |i|g| | | }}
L....IG...
{{pfend}}
</playfield>
Soft dropped
Soft dropped
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | |g| }}
........G.
{{pfrow| | |z|z| | |g| | | }}
..ZZ..G...
{{pfrow|l|l|l|z|z| |g| | | }}
LLLZZ.G...
{{pfrow|l| |i|i|i|i|g| | | }}
L.IIIIG...
{{pfend}}
</playfield>
Rotated left
|}
 
The following can be performed instead:
{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
|<playfield>
....I.....
....I.....
....I.....
....I.....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Rotated left
|<playfield>
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Moved right
|<playfield>
..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...
</playfield>
Soft dropped
|<playfield>
..........
..........
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.IIIIT...
</playfield>
Rotated left
Rotated left
|}
|}
Line 162: Line 225:


{|
{|
|valign="top"|{{pfstart}}
|valign="top"|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |i|i|i|i| | | }}
...IIII...
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |g| | |s|s| | }}
...G..SS..
{{pfrow| | | |g| |s|s|j|j|j}}
...G.SSJJJ
{{pfrow| | | |g| | | | | |j}}
...G.....J
{{pfend}}
</playfield>
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |g| | |s|s| | }}
...G..SS..
{{pfrow| | | |g| |s|s|j|j|j}}
...G.SSJJJ
{{pfrow| | | |g| | | | | |j}}
...G.....J
{{pfend}}
</playfield>
Rotated left
Rotated left
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | |g|i| |s|s| | }}
...GI.SS..
{{pfrow| | | |g|i|s|s|j|j|j}}
...GISSJJJ
{{pfrow| | | |g|i| | | | |j}}
...GI....J
{{pfend}}
</playfield>
Soft dropped
Soft dropped
|
|
{{pfstart}}
<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | |i| | | | | }}
....I.....
{{pfrow| | | |g|i| |s|s| | }}
...GI.SS..
{{pfrow| | | |g|i|s|s|j|j|j}}
...GISSJJJ
{{pfrow| | | |g|i| | | | |j}}
...GI....J
{{pfend}}
</playfield>
Can't rotate right
Can't rotate right
|}
|}
Line 217: Line 280:
In [[Lockjaw]], both left and right prefer to kick down rather than up when rotating:
In [[Lockjaw]], both left and right prefer to kick down rather than up when rotating:
{|
{|
|valign="top"|{{pfstart}}
|valign="top"|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | |i|i|i|i| | | }}
...IIII...
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| | | | | |t| | | }}
L.....T...
{{pfend}}
</playfield>
|{{pfstart}}
|<playfield>
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| | | | | |t| | | }}
L.....T...
{{pfend}}
</playfield>
Rotated right
Rotated right
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | |i| | | | }}
.....I....
{{pfrow| | |z|z| |i|t| | | }}
..ZZ.IT...
{{pfrow|l|l|l|z|z|i|t|t| | }}
LLLZZITT..
{{pfrow|l| | | | |i|t| | | }}
L....IT...
{{pfend}}
</playfield>
Soft dropped
Soft dropped
|{{pfstart}}
|<playfield>
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | | | | | | | | | }}
..........
{{pfrow| | |z|z| | |t| | | }}
..ZZ..T...
{{pfrow|l|l|l|z|z| |t|t| | }}
LLLZZ.TT..
{{pfrow|l| |i|i|i|i|t| | | }}
L.IIIIT...
{{pfend}}
</playfield>
Rotated left
Rotated left
|}
|}


[[Category:Game Mechanics]]
[[Category:Gameplay]]
[[Category:Movement]]

Latest revision as of 09:05, 9 September 2019

Different rotation systems that approximate SRS apply different wall kicks and floor kicks when the player twists the I tetromino.

Guideline SRS

Games such as Tetris Worlds and Tetris DS are based on the Tetris Guideline, including SRS. They have the following behavior:

..........
...IIII...
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
....I.....
....I.....
....I.....
....I.....
..........
..........
...G..SS..
...G.SSJJJ
...G.....J

Rotated left

..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J

Soft dropped

..........
..........
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...GIIII.J

Rotated right

But the wall kicks are not symmetric, as the kick up is performed in preference to the kick down when rotating left:

..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...

Rotated right

..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...

Soft dropped

..........
..........
..........
..........
..........
.....IIII.
..ZZ..T...
LLLZZ.TT..
L.....T...

Rotated left

However, an extra block impedes the choice of the upward kick position:

..........
...IIII...
..........
..........
..........
........G.
..ZZ..G...
LLLZZ.G...
L.....G...
.....I....
.....I....
.....I....
.....I....
..........
........G.
..ZZ..G...
LLLZZ.G...
L.....G...

Rotated right

..........
..........
..........
..........
..........
.....I..G.
..ZZ.IG...
LLLZZIG...
L....IG...

Soft dropped

..........
..........
..........
..........
..........
........G.
..ZZ..G...
LLLZZ.G...
L.IIIIG...

Rotated left

The following can be performed instead:

..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
....I.....
....I.....
....I.....
....I.....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...

Rotated left

.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...

Moved right

..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...

Soft dropped

..........
..........
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.IIIIT...

Rotated left

Tetris Advance

Minna no Soft Series: Tetris Advance, while implementing SRS, included several bugs including the lack of some wall kicks.

..........
...IIII...
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
....I.....
....I.....
....I.....
....I.....
..........
..........
...G..SS..
...G.SSJJJ
...G.....J

Rotated left

..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J

Soft dropped

..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J

Can't rotate right

Lockjaw

In Lockjaw, both left and right prefer to kick down rather than up when rotating:

..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...

Rotated right

..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...

Soft dropped

..........
..........
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.IIIIT...

Rotated left