Shipwreck Galleon Stacking (or just SG Stacking for short) is an opener that was discovered by Winterfrost. The opener only needs S or Z to come before O in the first bag, assuming mirrors are used.
Path 1 (L before O)
This path requires L to come before O, and S to come before Z or after both J and Z.
If S comes after both Z and J, press clockwise, soft drop, and clockwise to kick it in.
The 3rd and 4th bags are stacked like so. Softdropping pieces can avoid the need to wait for gravity.
Alternatively, the 4th bag can be stacked like below if Z comes before O, but after S, leading to a clean 6-3 or 5-4 stack depending on whether the T-spin was performed horizontally or vertically. The L piece may need to be soft dropped into place if it comes after the Z piece, or you can freestyle instead.
If L, J, and O come early in the 4th bag, you may be able to extend the setup into a BT Cannon to chain your attacks in a combo.
Path 2 (O before L)
This path requires O to come before L, and S to come before Z or after both J and Z.
You can choose to end the opener here, or continue into a DT Cannon.
The third bag can be stacked like below or freestyled if O comes before L.
Path 3 (All Bags, Waste T into TST)
If either of the two paths above cannot be built because of the order of the J, S, and Z pieces, then this path can be used instead. This path can also be used if you just want a safer option than the other two paths, as it can always be built one of these ways and doesn't require as much commitment. Only the first two setups are needed to cover all bags, but you can use the third setup if O comes before L or freestyle this bag for a cleaner stack or a higher chance to get another TST.
Perfect Clear Loops
If you get L before O, you will always be able to stack this loop.
This field has a 60.08% chance of achieving a 10 line perfect clear with 51 minimal solutions. If there is no perfect clear or you wish to complete a full loop, you can continue to a 14 line perfect clear.
This is the main path as it can always be built with 2 forms and leads to a 99.92% chance to achieve a 14l perfect clear.
If your queue allows it, you can go for the path shown below which, while not always buildable, still has a high build chance and a 100% perfect clear chance.
If you get O before L in the second bag, you can go for this loop instead.
The resulting field also has a 100% chance to achieve a perfect clear with 17 minimal solutions, a large amount of which can score a Tetris. Credits to swng for getting the minimals.
The third bag can also be stacked like below, which will still lead to the same field.
Path 4 (All Bags, TSM into STD)
This path can always lead into a Triple Double after a TSS, with 2 paths.
J before O
O before J
Path 5 (All Bags, TSM into Freestyle)
This path is very versatile and allows for many continuations, making it best to freestyle afterwards.
