From Hard Drop Tetris Wiki
Uratos Double Triple Cannon, Uratos DT Cannon or UDT, also known as Wrench Cannon (The opener base looks like a wrench), is a variation made by Uratos of the 璃畏怖5P opener (translation not available), which includes 2 T-Spin Single followed by DT Cannon setup. The opener finishes with a stack most suitable for Back to Back chaining. However, this opener is not 100% guaranteed and is relatively easy to mess up; thus, it is not recommended for beginners to use UDT.
Note that this page is still missing plenty of infomation.
Uratos Double Triple
1st Bag: 璃畏怖5P base
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This opener is bag specific, requiring early O and I, and late T for optimal setup.
In order for it to be buildable:
- O must not come in last in the O S Z T group.
- J, L, and T must not all come in before O or I (O and/or I can be in between the three pieces):
- If J comes in before O and I, Z must come in before S, unless O and/or I immediately follow J (there can be at most 1 piece in between).
- If L comes in before O and I, S must come in before Z, unless O and/or I immediately follow L (there can be at most 1 piece in between).
- If J or L comes before I, you might need to I-Spin.
- If I comes in last in the I J L group and after T, it may become the Diminished UDT Cannon where you have to T-Spin without any line clears (sometimes just placing T without T-Spin at all), I-Spin, then skim the line with J or L, delaying the Back to Back chain.
I-Spin
In cases where you need to I-Spin, if the I piece is on the left side, rotate clockwise, soft drop, then rotate clockwise once more.
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If the I piece is on the right side instead, rotate counterclockwise, soft drop, then rotate counterclockwise once more.
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2nd and 3rd Bag
2nd Bag
The S piece might have to be placed on the O piece if it comes before the T piece.
Highland |
Mountain Peak |
Highland |
Highland |
If in the 3rd bag, S and Z are late, use the setup in the second figure, although you should be wary of misdrops.
Use the setup in the third figure for S before Z. In this setup, it is preferable to T-Spin before placing the J, if O is already placed, and O if J is already placed.
Alternatively, you can build it as following:
Jagged Peaks |
Wide Peaks |
3rd Bag
Finish the DT Cannon setup: SESY (Semi-symetrical) Setup
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Alternatively, you can build it like the following:
- S/Z overhang
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- J/L overhang
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Continuations
You can use these continuations after clearing the DT Cannon. For simplicity, the following will be based on the Main setup.
Note that by clearing the DT Cannon, you are using the T pieces from the 3rd and 4th bag
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Back to Back Chaining
This continuation is mostly free style. You can start by tucking the L under the overhang or do a Mini T-Spin Single to fill the stack. Then continue stacking up and maintaining Bach to Back.
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Perfect Clear
(This lacks a substantial amount of information)
So far, the easiest and most reliable setup for PC, found by Uratos, is the following:
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10 solutions have been found by hand for this setup.
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Imperial Cross
From 2nd bag, you can instead build this setup and sacrifice the T-Spin Triple for Imperial Cross. However, this setup is probably riskier than other setups.
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Or alternatively
- Hold I
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- Hold Z
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After clearing the Imperial Cross, you can continue the Back to Back chain similarly to what was mentioned above. However, since this setup uses a lot of T pieces, you will most likely be left with a 2w or 3w well in the center of the stack; thus, you can choose to combo instead.