From Hard Drop Tetris Wiki
Shadow Cannon is a set of continuations found by westl from the first bag of Gull Wing TSD. The dependencies are I before S and J before Z, or if mirrored I before Z and L before S. It In the best scenario, it can achieve Perfect Clear after 8 lines which leads into a potential DPC loop or Perfect Clear after 10 lines. It can also be used as an Anti-Perfect Clear opener due to the fact that the first TSD can be built quickly, or simply an opener that sends a quick attack at the very start of the game, like Stickspin.
First Bag
First Bag |
Residue |
Setup rates are 43.33% on one side, or 57.22% when counting both orientations. This resembles the first bag of a TKI 3 Opening, except for the fact that the Z/S piece is placed vertically.
Continuations
These continuations are grouped by the first piece of the second bag.
Early Z Piece
I -> L
Second Bag |
Residue |
Third Bag |
Third Bag |
Residue |
This can be stacked most of the time. It will fail if S and T come before both L and J shows up early.
Fourth Bag J -> O |
Fourth Bag O -> J |
The fourth bag can be stacked in one of two ways. Note that only S and Z need to be placed for the T-Spin Triple to be complete.