Cat cannon

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The Cat Cannon is a 3 bag opener created by the player Cats. It creates a Polygon Cannon, which is a DT cannon stacked on top of an STSD, making a TSD -> TST -> TSD -> TSD attack. It can be used when your opponent opens with delayed T-spin openers such as DT cannon, or combos such as 4-wide.

First Bag
This is the first bag build. The dependencies are early I and late T pieces.

Second Bag
The second bag can be built in many ways. However, the general idea is to put O on the left side and make a SL or ZJ heart in the middle. Then, you place the T piece on the heart. These two builds are generally used quite often. If you think you can't build the second bag, or being pressured early with an opener like TKI, you can always opt out for an STSD instead. This would often be a safer option.

Third Bag and Beyond
Place the L and J pieces and fill up the area on the right. If your queue does not have L and J, you can build the DT cannon overhang with different piece sequences such as S and Z pieces.

After all four T-spins are completed, this opener leaves no TST overhang, which is suitable for downstacking or clean 0-9 upstacking.

Alternative build
The base can be built with IL instead of JO.

Midgame
Finding a Polygon Cannon setup midgame is difficult and limited due to the height of the shape, as well as wasting multiple T pieces in the stack, however it will offer a huge benefit as it can create a spike with various T-spins.