From Hard Drop Tetris Wiki
This is an opening created by player Mr. T-Spin. STD stands for Single Triple Double which notes how many lines are cleared by the corresponding T-Spins. It is efficient in the sense that it does not waste any T's, the rate of success is extremely high, and that it starts the B2B early. It is also a good way to counter Center 4-Wide openings.
Mr. T-Spin's Single-Triple-Double
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Mirrored Alternative to Mr T-Spin's STD
In the event that you get a late J, consider this:
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OSZ in Second Bag
The O, S and Z-pieces in the second bag can always be stacked in a way that a T-Spin Triple is prepared at the end of the bag. The order of the pieces in the second bag does not matter at all - the stack will always look the same at the beginning of the third bag.
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Perfect Clear chance
If J-piece comes late in the second bag, then the positions of O-piece and J-piece can be swapped that means the O-piece is used to build the overhang. This results in a small Perfect Clear chance after 8 cleared lines (3 bags) whereas only a T-Spin Single is made in the third bag.
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Here are some further patterns to achieve the Perfect Clear. One of those 6 patterns will be applicable for 39.3 % of all third bags.
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Nosomi Continuation
Like previously mentioned, the stack will always look the same after 2 placed bags. With this continuation discovered by the player Nosomi, even the third bag can be placed in the same way, whereas a T-Spin Single is made in the third bag instead of the usual T-Spin Double. The Z-piece stays on hold until the end of the bag and is then used to prepare a DT Cannon. Altogether, the following T-Spins are made in the first 5 bags:
Single -> Triple -> Single -> Double -> Triple.
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Disadvantage of the technique is that you may have to softdrop the O-piece during the third bag; or make a tricky twist to get the T-piece in place, if the S-piece was already placed: First you rotate by 180 degrees, then you softdrop a row, rotate in an arbitrary direction (the T piece will be kicked) and rotate back in the other direction.
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Here are some alternative ways how to place the fourth bag:
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STSD
First Setup
You can also do an STSD with a 58.3% chance to end with a Perfect Clear after 14 lines.
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Here are all solutions. The first 3 may result with a T-Spin Double beforehand.
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If you abandon the STSD, then there is a chance of a PC after 10 lines.
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Second Setup
There is also another way to set up an STSD which could end with up-to 100% chance of getting a 14th row Perfect Clear. This setup was discovered by the player CaptainCream.
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The S, J , L and I on the 3rd bag can be stacked in a way that they still have the same shape after stacked.
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If L comes before O on the 4th bag, making the first 4th bag pattern is possible. This pattern has 93.23% chance of Perfect Clear. If T comes first on the 5th bag, the chance increases to 100%. There's also a slight chance that T-Spin Double, Tetris and Perfect Clear could be done in the same bag.
16 solutions; 7 shown (Both T-Spin Double and Tetris could be done on the second Perfect Clear pattern). All solutions.
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If O comes before L on the 4th bag, making the second 4th bag pattern is possible. This pattern has 76.51% chance of Perfect Clear. All solutions.
8 solutions; 4 shown
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Other T-Spin Single Triple Double Openings
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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See also
- Hachispin - an opener that also starts with a T-Spin Single and a T-Spin Triple
- Albatross Special - a setup that can result in a T-Spin Double Triple Double
- Mini Triple Double - openers that start with a T-Spin Mini instead of a T-Spin Single
- DoubleYou - an opener which may also result in an STD