From Hard Drop Tetris Wiki
Single Triple Double are setups that starts with a T-Spin Single in the first bag, a T-Spin Triple in the second bag, and a T-Spin Double in the third bag.
Mr T-Spin Analogon
Left and right part swapped, so the T-Spin Triple overhang points towards the wall. This opening has the same dependencies as Mr. T-Spin's STD in the first bag (must place O before I and Z before L), and in the second bag O, S and Z must be stacked in the same way. After the execution, the only real difference is that the T-Spin Triple overhang points towards the closer wall which will result in different leftovers.
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If I piece comes last in first bag, one can also drop it on the wall which allows to stack the T-Spin Triple overhang differently.
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Here are some ways how the second bag can be stacked, if the I piece is placed in its usual spot. None of them result in a Perfect Clear chance.
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To prevent that vertical L-piece overhang, it is sometimes possible to keep the L piece on hold and use J-piece from the third bag in its place.
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Pokemino's STD
Almost every game can be started with this opening. The only dependency in the first bag is that J must be placed before Z (respectively L before S in the mirrored setup). In contrast to Mr. T-Spin's STD it is not possible to make a T-Spin Triple at the end of the second bag every time. The dependency is quite high in the second bag, that I must come before Z and O must come before J.
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In the likely case that the overhang cannot be completed with the second bag, the following stack is well suited for most third bags.
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Hopefully, S or Z show up before T in third bag, so that no T piece must be wasted. Otherwise, it is also possible to spin in the T-piece to get a T-Spin Double, then stack an overhang on the left side to make a T-Spin Single with the third T-piece, and finally the T-Spin Double from the STD in the fourth bag.
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Early I-Piece
This setup has many dependencies in the first bag and the T-Spin Triple is not guaranteed in the second bag in which case it is hard to stack an alternative. Thus this setup is not really useful.
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However, if the second bag can be placed like above, then there is a Perfect Clear opportunity after 8 cleared lines. One of the following patterns will work for 64.7 % of all third bags and in any case a T-Spin (Single or Double) is made beforehand.
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Here are some further ways to get a T-Spin Triple in the second bag. None of them offers a Perfect Clear chance (actually the fourth one does but not with a T-Spin beforehand).
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T-Spin Mini Zero 【JD砲】
This setup starts with a T-Spin Mini that clears no line. Afterwards it goes for an STD. Not really useful.
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