F-Spin is an Polymer T-Spin opener that usually results in a Iso-T-Spin Triple in the second bag and a T-Spin Triple in the third bag into Super T-Spin Double in the fourth bag, discovered by ___nek0. Note that Iso-T-Spin Triple can only be done on games which have 180° rotations and SRS 180° kicks, like Tetr.io.
First bag
The second setup has a better build chance, but needs more key presses.
Variant 1
The main and best continuation.
Second bag
S>Z
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Soft drop
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Counter-clockwise
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180° Rotation
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Counter-clockwise
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Third bag
100% with 180 rotations.
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Hold soft drop
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180° Rotation
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180° Rotation
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Clockwise
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Hold soft drop
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Clockwise
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180° Rotation
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Clockwise
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Fourth bag
if you can stack JZ like this, it will result in a better stack.
Perfect Clear after 8 lines (Third bag)
46.7%, 97.7% early S. 4 minimals.
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Save Z
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Save J
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Save O
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Save Z
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Variant 2
Build this when it is impossible to build the main continuation (found by ChairStair).
Second bag
Z>S
Perfect Clear after 8 lines (Third bag)
97.86%, 24 minimals. Link to all solutions: Fumen
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44.37%
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36.90%
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32.18%
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29.76%
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TSD into DT Cannon
When it is impossible to build the main continuation in the second bag, you can freestyle the STMB Cave or use these T-Spin Double into DT Cannon continuations (found by Zera).
L>S (O first)
L>S (J first)
L>S (I first)
S>L (Late J)
S>L (Early J)
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Counter-clockwise
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Hold softdrop
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Counter-clockwise
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180° Rotation
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Clockwise
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