Keymo opener

Keymo opener is a 6-3 opener developed by Keymo, along with winterfrost. It starts with an incomplete kaidan-cutcopy followed by 2 t-spin doubles, and leads to stable 6-3 midgame.

Benefit of keymo opener: It has a good build rate, and for queues where you it can't be built, other very good openers can be used. 2 solid examples are Tki and Mko (Queue -> IJL can be used for both Mko and Tki)

The opener is also known as Divorced gassho, as in gassho, the S and Z minos are hugging, but in this opener, they have separated, and Z piece found a new partner (T piece.)

First bag
The opener has very few dependencies, all you need is O before I. If you can make the LSJ box early, the rest of Bag 1 is buildable. S as first piece, placed vertically all the way to the right, also makes bag 1 buildable (you can softdrop the L).

DT cannon
This alternative can always be stacked or used when O comes before L in the second bag. For the 3rd bag of this path (diagram 3), use J to make tst-type kicknotch and enjoy your DT cannon.

While the DT cannon alternative sends a nice attack, be aware that it ruins the 6-3 of the opener and turns into more of a 5-4 stack afterwards. The two paths for stacking it are J before O and O before J.

The diagram below shows some ways to make the overhang for the DT cannon

Alternatively, if you get J before O you can always continue the 6-3 stack with a fractal instead of a DT Cannon.

Third bag
This is the ideal third bag. You can either take the top or bottom part of the fractal depending on your piece order. It is possible to always stack this way if you don't mind taking a TSS and skimming sometimes.

Other ways to build the third bag. Either way, the goal is to make the fractal.

In the 3rd and 4th diagrams above, if you need to spin the Z (L before Z), do a standard z-spin, 180, then clockwise rotation.

Fourth bag and later
After the end of keymo opener, (bag 3), you can continue to 6-3 stack and build numerous floating tspins