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DT Cannon)
Double Triple Cannon, sometimes referred to as DT Cannon or DT (known as DT砲 in Japan), is a T-Spin combo designed by player TKI. The setup is essentially a T-Spin Double followed by a T-Spin Triple. A player utilizes the T-Spin Triple wallkick in SRS to make a T-Spin Double that leads into a T-Spin Triple. In Tetris variants without instant lockdown it is best to hold the soft drop button until the T-Spin Double has been completed. This makes it instantly drop "through the gap" so the T tetromino does not rotate early and end up in the wrong spot.
Empty Field Setups
Because so many DT Cannon setups exist, the player can choose a setup that fits the order of their opening bag of pieces. It is usually possible to hold a T through the second bag and into the third, allowing the player to make both T-Spins in quick succession.
Standard DT
This setup is the most commonly used among players due to its easy pattern and generally lower keypresses needed. If you plan on learning DT Cannon this is absolutely necessary to know.
TKI's Signature
IT Balance
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IT Balance 1
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IT Balance 2
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IT Balance 3
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Overhang Var.
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IT Balance With 13 pieces,
a T tetromino should be in
the hold box at this point
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TZ Base Setups
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TZ with JL overhang
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TZ with SL overhang
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TZ with OZ overhang
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TZ with JL overhang
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JO Base Setups
For these setups, build the JO base first, the fill second, and the OJ structure on the left last.
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JO Base 1
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JO Base 2
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IL Base Setups
JL Base Setups
DT-Cannon with no T Pieces
In this setup, the player tries to use no T pieces to set up their DT-Cannon. It is only possible to clear this setup within 14 pieces if the second T is at the end of the second bag, but, if successful, this is the fastest DT-Cannon setup (in terms of piece efficiency, other setups may be faster to execute - see Efficient DT-Cannon Openers section below). Otherwise, the second T will be used for the upstack, reducing this setup's efficiency to the same as the rest listed here.
Other Setups
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O Base
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LS Base
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LS Base 2
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JZ Base
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LZ Base
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Efficient DT-Cannon Openers
With the right set of pieces (one of L/J needs to come before S/Z, both if T comes too early) DT-Cannon can be stacked with very few key presses by taking advantage of two-step finesse. Even though a T piece is "wasted" in the stack, this build can be performed faster than many builds that are more piece efficient (such as Albatross or C-Spin), thus making up for the extra pieces placed. In fact, having more pieces in the stack can sometimes be advantageous, because they can more quickly be transitioned into a 4-wide stack or a Tetris stack. The mirror with cannon on the right side uses more key presses, so it should be stacked on the left for optimal efficiency.
Depending on the bag, the alternate form might be needed.
The JZ Base DT Cannon results in the same stack but needs more key presses. The second bag is usually placed in one of the following ways. Sadly, none of them will work with certain piece combinations involving early T and S pieces (e.g. TSIZ).
Situational Setups
Lower Notch and Overhang
Higher Notch
Line Clear Shaping
DT STSD
This setup looks identical to DT Cannon, with the only difference that one further cell is empty at the bottom (marked light grey in the first diagram below). It results in an STSD after the first T-Spin Double is cleared. So, it is usually 3 T-Spin Doubles in total.
DT STSD has the advantage that no overhang will be left after the last T-Spin. A regular DT Cannon has the advantage that it is easier to build, faster to execute and that one can build a 4-wide on top of it. However, receiving a garbage line with the hole in the wrong column will break the execution of the STSD. As opener, it may be actually better to stack it with an additional line below (see second diagram below). The third to fifth diagrams below show a combined setup that results in 4 T-Spin Doubles.
Similar DT Attack
The S piece takes over the place of the O piece. One must execute the T-Spin Double before the J piece can be placed on the left side. This setup has the disadvantage that it takes more time to soft-drop the T-pieces, that the T-Spin Double can not be held back and that the 2 T-Spins cannot be chained in one combo.
