F-Spin

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

Third bag
100% with 180 rotations.

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.

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: [http://harddrop.com/fumen/?v115@zgh0ywR4C8g0RpwwR4D8g0RpBthlG8BtglI8glC8Je?AgWaAU+nAB3ngHBFbcRASEZ9ATRaHBQecRAylAAAzgRpywR?4C8RpglwwR4D8ilzhG8i0I8g0C8JeAAPaATB4UBwngHBFbc?RAS0mRBWIaHBQecRAylAAAzgRpBtywC8RpglBtwwD8ilzhG?8i0I8g0C8JeAAPaAT735A4ngHBFbcRAS02KBSLaHBQecRAy?lAAAzgglRpzhC8glRpwwBtD8hlywBtG8i0I8g0C8JeAAPaA?yFIOB2ngHBFbcRAS0eHBQIaHBQecRAylAAAzgilzhC8glR4?wwBtD8R4ywBtG8i0I8g0C8JeAAPaASE45A3ngHBFbcRAS0G?EBSIaHBQecRAylAAAzgglRpzhC8glRpR4AtD8hlR4BtwwG8?AtxwI8wwC8JeAAPZAxFwKB4ngHBFbcRAS0QVBymv2AUo78A?ZAAAAzgzhywC8Rpg0BtwwD8Rpi0hlG8BtglI8glC8JeAAPZ?AxC4UB0ngHBFbcRAS042A0mv2AUo78AZAAAAzgi0zhC8Rpg?0R4AtD8RpR4BtwwG8AtxwI8wwC8JeAAPZAxCIOB0ngHBFbc?RASkOVB0mv2AUo78AZAAAAzgh0AtzhC8g0BtwwRpD8g0Aty?whlG8RpglI8glC8JeAAPZAR+nAB3ngHBFbcRASUk9A0mv2A?Uo78AZAAAAzgh0R4ywC8g0R4BtwwD8g0zhhlG8BtglI8glC?8JeAAPZAx8f2AyngHBFbcRASEqHB2mv2AUo78AZAAAAzgzh?i0C8RpilQ4D8RpglBtR4G8BtQ4I8g0C8JeAAAzgi0BthlC8?Rpg0wwBtD8RpywR4G8R4glI8glC8JeAAPZAR4/DB4ngHBFb?cRAS0f9A4mv2AUo78AZAAAAzgh0wwBthlC8g0ywBtD8g0zh?R4G8R4glI8glC8JeAAPZAR4nAByngHBFbcRAS0f9Awmv2AU?o78AZAAAAzgh0AtR4glwhC8g0BtilD8g0AtR4RpwhG8Rpwh?I8whC8JeAAPYAZlf9AFrnRASo78AYe22AvfEEBwnAVBzgil?i0whC8Btywg0D8glBtwwRpwhG8RpwhI8whC8JeAAPYAYF8A?BFrnRASo78AYet2AvfEEBwnAVBzgywi0whC8ilR4g0D8glw?wR4RpwhG8RpwhI8whC8JeAAAzgRpglywwhC8ilR4g0D8RpR?4wwg0whG8h0whI8whC8JeAAPYAX1h9AFrnRASo78A4cWEBv?fEEBwnAVBzgh0BtilC8g0RpBtQ4D8g0RpzhG8glR4I8Q4C8?JeAAPYAXV9KBFrnRASo78A4MELBvfEEBwnAVBzgilQ4i0C8?BtzhD8glBtR4RpG8Q4RpI8g0C8JeAAPYAW1ZOBFrnRASo78?A4M7KBvfEEBwnAVBzgBtywhlC8g0BtwwRpD8i0zhG8RpglI?8glC8JeAAPYAUVNEBFrnRASo78AY7IEBvfEEBwnAVBzgg0R?4ywwhC8R4BthlD8i0BtglwhG8wwglwhI8whC8JeAAPYATVO?6AFrnRASo78A4po9AvfEEBwnAVBzgg0R4RphlC8R4zhD8i0?RpwwglG8ywI8glC8JeAAAzgi0Q4ywC8RpzhD8Rpg0R4hlG8?Q4wwglI8glC8JeAAAzgRpzhwwC8i0Q4BtD8Rpg0R4BtG8Q4?xwI8wwC8JeAAPYASlPEBFrnRASo78A45oRBvfEEBwnAVB Fumen]

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).