Speedboat

Speedboat is an extremely low KPP (for the first bag) TSS → TST → TST (or PC) opener developed by Kerrmunism, found using pwn_by_numbers's setup_finder.

For dependencies, you'll want an early J, as you'll need a J before your L and O in the first bag. Other than this, there are no dependencies.

Second Bag
Depending on the order of pieces in your second bag, you'll have to build the setup in different ways.

The most ideal scenario involves you being able to hold your Z until the very end of your stack, building in a way like this.

Early Z & J
When you get an extremely early Z and J, you'll usually want to build like this, softdropping your J into the slot made by the Z (usually by softdropping onto the far right side of the build and holding left)

Of course, this could also be done without softdropping if you get your J before your Z.

Alternatively, if you get your J before your Z, and get your O before your I, you can build like this, and then softdrop your O into place.

180 Route
If you're playing in a game with 180-spins and a certain rotation system, you may be able to build like this.

Extra
In rare circumstances, you may have to build your second bag like this and use an extra piece in order to fill in the rest of the T-Spin Triple.

Third Bag
Depending on how you build your second bag, you'll usually fill in one of these ways, or something similar to it.

Perfect Clear
If you're able to hold your Z in the second bag and you get an early S (or sometimes an early O) in the third, you'll have a high chance (86.21%) of getting a Perfect Clear by stacking something like this.

All solutions are linked here. There are 14 minimals.

Even if you miss these Perfect Clear solutions after going for it, you have a high chance of being able to get a TST anyways and potentially to continue into a Perfect Clear.

TSD → Single Double
If you had to place your Z in the second bag, you will be able to set up a Single Double by doing something like this, which will work for all bags.

For simplicity, assume your board looks like this afterwards, but you will build the exact same way no matter what.

After doing the first TSD, put your L like this, and put your I on the far right if you need to.

Now, simply fill in the left side to make sure the STSD can fully be executed.

The Speedboat Loop
Speedboat is able to be looped under some certain conditions.

- You don't get O before either your L, J, S or Z blocks in the first bag (basically, if you don't get O in the start of your first bag)

- You are able to build the second bag

- You are able to perfect clear in the fifth bag (which is RNG, the lowest chance being 79.44%)

Start the loop by building the first two bags with the Early Z method previously shown so your board looks like the below picture at the end of the second bag. Depending on your bag order, you may have to waste a T or have this shape but mirrored, both of which are fine.

From this point, build like this if at all able.

Again, you may have to waste a T in order to do this. If you are unable to build like this, build the STSD PC or Single Double PC builds shown below instead.

Assuming you are able to get through the third bag, build like this if at all possible, wasting your T piece if needed.

If you are able to build like this, you'll have a 99.44% chance of a Perfect Clear with 10 minimals.

The four most likely solutions (all of which are over 50%) are shown below.

A link to all possible solutions is shown here.

If you have to place your O in the fourth bag, do so like this.

While this decreases your chances, it still gives you a 79.44% chance of doing a Perfect Clear and continuing the loop.

There are 12 solutions which all follow the form of these 6 diagrams shown, except the order of the L and J are swapped.

STSD PC
If you were unable to stack the third bag using the first method, you'll likely be able to stack this alternative third bag.

From here, stack like this if you're able to. If not, simply take the STSD by building in some other fashion.

You now have an 83.89% chance of a Perfect Clear with 5 minimals, shown below.

Single Double PC
If neither of the previous two methods were available, this one should always work. To perform, build the Single Double as normal so your board looks like this. It will be build the exact same way at the one in STSD PC, but with the T rotated one more time.

From here, build like this if at all possible.

You now have an 100.0% PC chance with 4 minimals.

With the last solve, you have a chance for a TSD.

After performing the Perfect Clear, simply stack for another Speedboat, following the loop or the normal opener again. If you are unable to build your first bag in the normal way, you may attempt to build like this, which well help cover some certain bags, but removes the possibility of getting a T-Spin Single at the start.

Alternate Early Z build
While placing your T for the first bag of the opener, if you see a Z in queue you can opt to stack this way instead.

You now have an 83.10% chance to PC with 7 minimals. (Or 85.54% with Tetrio 180s.)