Hard Drop Tetris Wiki:ISM's cannon
From Hard Drop Tetris Wiki
ISM's cannon is an opener with a series with TSS - TSD - TST patterns by ILUSM You will need a L before S to execute the T-spin single in the first bag(J before Z when mirrored). This opener can frequently be done due to having little dependencies on piece orders.
T-spin single
Residue
First bag
Residue
In the first bag, it can be built if the L comes out before the S , or the J comes out before the Z .
Second Bag
Variant 1
if I comes before L
Variant 2
if L comes before I
Variant 3
if O comes before L Z S
In the second bag, it is nearly always possible to stack like. And no matter where the garbage comes from, it can always be built.