From Hard Drop Tetris Wiki
Sewer
Sewer (known as TZT砲 in Japan) is a setup that uses three consecutive T-Spin Triple attacks. Completion of the setup sends 20 lines to your opponent which is enough to fill their field with garbage. The reason this setup is not commonly used is because it makes the assumption that your opponent disconnected their controller in order to work. It is discovered by Yuu.
Full Setup Example
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First Bag
You can build Sewer if your opening bag has a late I piece while you get the S/J pair before the Z or the Z/L pair before the S.
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Completed first bag:
Normal Setup |
Mirrored Setup |
Second Bag
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In the first loading method, L can be spun in even after O and Z may be placed.
Third Bag
You will need to spin in the Z piece. Some examples of how the third bag may be stacked:
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Fourth Bag
Place J and L like below and make an overhang (I overhang depiected).
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