Setspin

Setspin is a TSS opener created by 10Penta. Its main continuation is a TST Tower, and there is a more than 99.2% chance of executing the TST Tower on the 3rd and 4th bags, much higher compared to most other TST Tower openers.

First Bag
The first bag has a 63.3% chance to stack the first bag including the mirror, and a 43.3% chance not including mirrors.

Second Bag LJOS
For the second bag, the LJOS is always placed the same way, while the ITZ needs to be placed differently depending on your bag. The LJOS is always placed as follows (the LJO rectangle may need to be flipped depending on whether L or J comes first):

You may need to use hold.

Route 1 Z<T
The first image can always be built, but the second and third may result in a flatter stack:

10-Line PC Chance
If you can stack like below, you have a chance for a 10-Line PC:

You now have a 12.62% chance to PC with 4 minimals, and a 7.6% chance for a TST solve:

Route 2 T<Z
Here, you simply want to place all your pieces except for the S like this:

And place the S piece somewhere, depending on the piece order. Below are some examples. This will always work unless you get an very early T and S (TS<IOJZ). If this is the case, there will be nowhere good to place the S.

Dealing With Early S
As mentioned above, if the S piece is too early, the setups above are not possible. There are 2 things you can do:

Alternate T<Z Setup
If you also get T<I, then changing the position of the I piece allows the 3rd bag to always be built:

Other
If none of the above setups are possible, your best choices are to waste T as below, forgo the first TST or downstack, depending on the amount of garbage your opponent has sent you. Waste T is highly risky for multiplayer as your stack is extremely high and you have nothing to cancel with.

C-Spin Follow-up
After most TST tower setups, it is possible to build a C-spin follow-up. Below is an example after the flat Z<T setup:

Incomplete TST Continuations
The following continuations, created by 10Penta, build an incomplete TST followed by an Imperial Cross, TST or TSD.

Route 1 O<Z
L and J are interchangeable.

There are many good ways to build an Imperial Cross here, the setup below covers all bags with the JLS rectangle interchangeable:

10-Line PC Chance
If you have I<S, then you can stack as below for a chance for a 10-Line PC:

You now have a 67.6% chance to PC with [https://harddrop.com/fumen/?v115@fgB8zhh0E8hlwwg0H8xwG8glwwg0G8glH8ywH8wwE8?JeAgWYAR4P9AFbcRAyv78Aw3CwBFbEwC0i3LCfgB8Bthlh0?E8Btglg0H8glg0G8ywG8wwH8ywH8wwE8JeAAPXAZVuRASo7?8A1no2AlsCSASYVxCqiDCAfgB8BtzhE8BthlH8wwglG8xwg?lG8wwH8ywH8wwE8JeAAPXAYleRASo78A1no2AlsCSASYVxC?sndBAfgB8BtzhE8Bth0H8g0glG8ilG8wwH8xwg0H8wwE8Je?AAPXAYleRASo78A1no2AlsCSASYVWCqndBAfgB8BtzhE8Bt?RpH8RpG8ywG8wwH8ywH8wwE8JeAAPXAYleRASo78A1no2Al?sCSASYVxCvndBAfgB8BtzhE8BtRpH8RpG8ilG8glH8ywH8w?wE8JeAAPXAYleRASo78A1no2AlsCSASYVWCvndBAfgB8zhR?4E8hlR4H8RpG8glRpG8wwH8ywH8glE8JeAAPXAV1gRASo78?A1no2AlsCSASYdgCMddBAfgB8Bthlh0E8Btglg0H8R4G8R4?g0G8wwH8xwglH8wwE8JeAAPXAUVuRASo78A1no2AlsCSASY?9tCqiDCAfgB8ywilE8i0wwH8xwG8whg0wwG8whH8wwwhglH?8whE8JeAAPXAUFjRASo78A1no2AlsCSASYNMCqC2BAfgB8z?hh0E8ilg0H8R4G8R4g0G8wwH8glxwH8wwE8JeAAPXATVuRA?So78A1no2AlsCSASY9tCqSdBAfgB8ywilE8wwi0H8R4G8R4?g0G8wwH8xwglH8wwE8JeAAPXATVuRASo78A1no2AlsCSASY?9tCqOkBAfgB8hlRph0E8glRpg0H8R4G8R4g0G8wwH8glxwH?8wwE8JeAAPXATVuRASo78A1no2AlsCSASY9tCqyqBAfgB8h?lh0R4E8glg0R4H8RpG8g0RpG8wwH8glxwH8wwE8JeAAPXAT?VuRASo78A1no2AlsCSASYdgCqyzBAfgB8Bth0R4E8BtR4H8?RpG8g0RpG8wwH8ywH8g0E8JeAAPXATVuRASo78A1no2AlsC?SASYdgCz3fBAfgB8hlRph0E8glRpg0H8wwg0G8ywG8wwH8g?lxwH8wwE8JeAAPXATVuRASo78A1no2AlsCSASYVxCqyqBAf?gB8zhh0E8ywg0H8R4G8R4g0G8wwH8ywH8wwE8JeAAPXATVu?RASo78A1no2AlsCSASY9tCqedBAfgB8i0ywE8zhH8R4G8R4?wwG8g0H8ywH8wwE8JeAAPXATFjRASo78A1no2AlsCSASY9t?CpufBAfgB8ywglh0E8ilg0H8R4G8R4g0G8wwH8ywH8wwE8J?eAAPXASlwRASo78A1no2AlsCSASY9tCqC2BAfgB8i0ilE8z?hH8RpG8g0RpG8wwH8xwglH8wwE8JeAAPXASlwRASo78A1no?2AlsCSASYdgCp/jBAfgB8ywAth0E8hlwwg0H8xwG8glwwg0?G8glH8wwBtH8AtE8JeAAPXASlwRASo78A1no2AlsCSASYVW?CqX2BAfgB8hlzhE8glRpwwH8xwG8RpwwG8wwH8glxwH8wwE?8JeAAPXASlwRASo78A1no2AlsCSASYVxCvSdBAfgB8i0ywE?8BtQ4wwH8R4G8BtQ4G8g0H8ywH8wwE8JeAAPXASleRASo78?A1no2AlsCSASY9tC6ufBAfgB8i0ywE8Q4g0xwH8xwG8ilG8?glH8R4wwH8Q4E8JeAAPXARlwRASo78A1no2AlsCSASYDxCz?ufBAfgB8i0ilE8RpAtwwH8xwG8BtwwG8AtH8RpglH8g0E8J?eAAPXARlwRASo78A1no2AlsCSASYlFDvifBAfgB8ywAth0E?8wwBtg0H8R4G8R4g0G8wwH8ywH8AtE8JeAAPXARlwRASo78?A1no2AlsCSASY9tCqX2BAfgB8i0ywE8RpxwH8xwG8ilG8gl?H8RpwwH8g0E8JeAAPXARVlRASo78A1no2AlsCSASYDxCvuf?BAfgB81wE8i0wwH8RpG8whRpG8whH8wwwhg0H8whE8JeAAP?XARVcRASo78A1no2AlsCSASICMCqO2BAfgB8ywAtR4E8zhH?8R4G8ilG8glH8wwBtH8AtE8JeAAPXAQVlRASo78A1no2Als?CSASY7LCzX2BAfgB8ywAtR4E8hlR4H8RpG8glRpG8glH8ww?BtH8AtE8JeAAPXAQ1gRASo78A1no2AlsCSASIKWCzX2BA 29 minimals].

Route 2 Z<O, J<L
A TST follow-up is ideal, but it can be better to make a TSD with a 14L follow-up if the TST is too messy. The best TST setup requires L<S:

TSD 14-Line PC
S<T (Ideal):

You now have an 100% chance to PC with [https://harddrop.com/fumen/?v115@zgRpQ4zhh0A8RpR4Btglg0E8Q4ilg0E8ywH8wwBtC8?JeAgWaA18HOBFbcRAyv78Aw3CwBFbEwCsvjFDP+AAAzgilB?tRpR4A8gli0BtR4E8g0zhE8ywH8wwRpC8JeAAPaA0FQ9AFb?cRAyv78Aw3CwBFbEwCJtzPCMHBAAzgRpzhywA8Rpi0BtwwE?8Q4g0glBtE8R4glH8Q4hlC8JeAAPaA083UBFbcRAyv78Aw3?CwBFbEVCz3HgCU+AAAzgRpilzhA8RpglQ4ywAtE8R4wwBtE?8i0H8Q4g0AtC8JeAAPaA08f2AFbcRAyv78Aw3CwBFbUOCaN?egCpCBAAzgRpQ4zhh0A8RpR4Btglg0E8Q4wwBtg0E8ywH8i?lC8JeAAPaAzCg2AFbcRAyv78Aw3CwBFbEwC6vTWCP+AAAzg?RpQ4ywwhh0A8RpR4hlwhg0E8Q4wwglwhg0E8BtglH8BtwhC?8JeAAPaAz8nABFbcRAyv78Aw3CwBFbUEDMentCvOBAAzgRp?Q4hlzhA8RpR4glh0AtE8Q4glg0BtE8ywH8wwg0AtC8JeAAP?aAz5/DBFbcRAyv78Aw3CwBFbEwC6vTWCP+AAAzgRpilQ4yw?A8RpglBtR4wwE8g0zhE8i0H8BtQ4C8JeAAPaAT4fRBFbcRA?yv78Aw3CwBFbUOCpHcgC0CBAAzgRpi0zhA8RpBtg0ilE8Bt?glR4E8ywH8wwR4C8JeAAPaAT4P9AFbcRAyv78Aw3CwBFbEw?CzXMgCp/AAAzgRpQ4ywglh0A8RpR4ilg0E8zhg0E8Q4BtH8?wwBtC8JeAAPaAyFgRBFbcRAyv78Aw3CwBFbUEDpvTWCvOBA?AzgRpywBtR4A8RpzhR4E8wwg0glBtE8ilH8i0C8JeAAPaAS?BIOBFbcRAyv78Aw3CwBFbEVCKdFgC6OBAAzgRpzhywA8Rph?lQ4BtwwE8glR4BtE8glg0Q4H8i0C8JeAAPaAy/nABFbcRAy?v78Aw3CwBFbEVCqHLxCT+AAAzgg0zhQ4ywA8i0BtR4wwE8R?pilE8RpglH8BtQ4C8JeAAPaAy/P9AFbcRAyv78Aw3CwBFbM?fCsHkPCU+AAAzgRpBti0R4A8RpzhR4E8BtilE8ywH8wwglg?0C8JeAAPaAy53UBFbcRAyv78Aw3CwBFbEwCMdFgC6/AAAzg?g0zhBtR4A8i0RpglR4E8RpglBtE8ywH8wwhlC8JeAAPaAy5?3UBFbcRAyv78Aw3CwBFbEwCM3jPCa+AAAzgRpQ4BtzhA8Rp?R4i0glE8Q4wwilE8ywH8Btg0C8JeAAPaAy5HOBFbcRAyv78?Aw3CwBFbEwCMtHgCa+AAAzgRpQ4hlwhywA8RpR4glwhh0E8?Q4glwhg0wwE8BtwhH8Btg0C8JeAAPaAy535AFbcRAyv78Aw?3CwBFbUEDpvTWCvOBAAzgRpzhywA8Rphlh0R4E8glg0R4ww?E8glBtH8g0BtC8JeAAPaAS4vKBFbcRAyv78Aw3CwBFbUEDz?iHgCU+AAAzgRpBtilR4A8RpzhR4E8BtywE8i0H8glg0wwC8?JeAAPaAxFYHBFbcRAyv78Aw3CwBFbUOCUdFgC6CBAAzgRpy?wBtR4A8RpzhBtE8wwg0glR4E8ilH8i0C8JeAAPaARE45AFb?cRAyv78Aw3CwBFbEVCKergCzOBAAzgRpQ4hlzhA8RpR4ywA?tE8Q4glwwBtE8i0H8glg0AtC8JeAAPaARE45AFbcRAyv78A?w3CwBFbUOC6+bgCM+AAAzgRpg0ywilA8Rpi0whglAtE8Q4w?wwhBtE8R4whH8Q4whAtC8JeAAPaARBIOBFbcRAyv78Aw3Cw?BFb8KCz3HgCsOBAAzgRpQ4ywilA8RpR4g0whglAtE8Q4g0w?hBtE8h0whH8wwwhAtC8JeAAPaARBIOBFbcRAyv78Aw3CwBF?b8KCqHcgCsOBAAzgg0zhQ4ywA8i0RpR4wwE8RpilE8BtglH?8BtQ4C8JeAAPaARBYHBFbcRAyv78Aw3CwBFbUEDM3jPCU+A?AAzgg0zhBtR4A8i0RpglBtE8RpglR4E8ywH8wwhlC8JeAAP?aAx/vKBFbcRAyv78Aw3CwBFbEwCMnzPCT+AAAzgRphlh0ww?R4A8RpzhR4E8glg0ywE8glBtH8g0BtC8JeAAPaAx/P9AFbc?RAyv78Aw3CwBFbUEDTuKxCs/AAAzgRpQ4Btg0ilA8RpR4ww?i0E8Q4zhE8ywH8BtglC8JeAAPZAVFsRASo78A1no2AlsCSA?SoktC0vaFDsAAAA 27 minimals].

T<S:

You now have a 98.53% chance to PC with 11 minimals.

Route 3 Z<O, L<J
There are TST continuations here, but most of them are messy, so freestyle is possible or the TSD 14L below:

TSD 14-Line PC
You now have a 99.46% chance to PC with T on hold with 12 minimals.

LST Stacking Continuaton
This LST Continuation, discovered by ADT, requires L<S: