From Hard Drop Tetris Wiki
Outlogic SD (also known as Octupus Tea Cannon, or earlier, ST Cannon) is an opening setup with the pattern of Single-line Skim→TSS→TSD→8L Perfect Clear/TSS→TSD→14L Perfect Clear. It has 96.39% chance of Perfect Clear with either 4 or 8 lines, or 99.88% with 14 lines. This setup is discovered and named independently by Japanese community and a Taiwanese player Octupus Tea; the former had it discovered before the latter, and the latter has discovered more continuations than the former. Kerrmunism and Agent 1568AH also contributed to this page.
First bag
The opener works the best with early S (or Z when mirrored) and preferably early I. However, late or held I results in additional 4-line Perfect Clear solutions.
If Z comes before I, one can build Stitch instead.
The setup rate is 73.81% (3720/5040) when counting both orientations, and 100.00% (5040/5040) if the skimming pattern is used.
Default pattern
T on hold or in queue.
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Hold I pattern
T and I on hold and/or in queue (setup rate 28.39%).
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4-Line Perfect Clear
Pieces left for the second PC are listed below each solve.
- Solution for the default pattern (11.43% PC rate)
OTSZ |
- 3 additional minimal solutions for the hold I pattern (21.67% PC rate with all 4 solutions)
TIOZ |
ITJZ |
TIOS |
Second bag
If the 4-line Perfect Clear is not applicable, one should do a T-Spin Single using the T from the first bag and stack the second bag as follows for a T-Spin Double.
The second bag can always be stacked like this.
1st bag TSS |
2nd bag TSD |
Short route: 8-line Perfect Clear
Minimal solutions
- 95.79% PC rate, 9 minimal solutions
Each of the nine minimal solutions are listed below with decreasing success rate. The pieces saved for DPC Setups are also shown under the solutions.
Setup A: Save S |
Setup B: Save Z |
Setup C: Save J |
Setup D: Save J |
Setup E: Save Z |
Setup F: Save J |
Setup G: Save L |
Setup H: Save L |
Setup I: Save J |
Solutions with T-Spin
The T-Spin PC chance is 42.22%, combined with solutions A and F.
Setup J: Save O |
Setup K: Save L |
Long route: 14-line Perfect Clear
Third bag
The third bag is always stackable with 180 rotation (95.00% setup rate without).
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Fourth bag and 14-line Perfect Clear
Fallback: always TSD
This pattern is always stackable.
4th bag |
PC |
- 99.60% PC rate, 9 minimals
- Solutions with at least TSS: The TSS chance is 71.83%, and the TSD chance is 60.00%, 9 solutions
Pattern A: always TSD
This pattern is always stackable with 180 rotation (79.76% setup rate without).
4th bag |
PC |
- 99.88% PC rate, 4 minimal solutions
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- Solutions with Tetris: The Tetris PC chance is 72.78%, combined with the 4 minimal solutions.
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Pattern B: IJLO box TSD
This setup fails 3.33% of the time.
4th bag |
PC |
- 100.00% PC rate, 8 minimal solutions
- 94.60% to PC with Tetris or at least TSS, 32 minimal coverage solutions (out of 80)
Additional setups and continuations
First bag skimming pattern
There are 3 skimming patterns that result in the same remnants as the first bag default pattern after TSS, and 3 other ones that result in the same remnants as the second bag after TSD.
However, only one additional pattern is required for Outlogic SD to be always stackable. Despite the different shape, the resulted setup is the same.
1st bag skim |
2nd bag (with skim) |
Shachiku Train (Mechanical TSD)
Repeatedly stacking Shachiku Train would form a column-rotated Mechanical TSD v3. This is not recommended in combats, since it results in increasingly higher stacking and two 1-wide wells.
The following figures shows the first few steps of this continuation.
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Special continuation
The following special setup leads up to a BT Cannon after stacking the 4th bag. It is always stackable until the 8th bag (Interchangeable JLZS only covers 88.25% of all possible bags). It is also not recommended in combats as the stack and the KPP are both very high.
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The 4th bag | Interchageable JOL | Interchangeable JLZS | BT Cannon |
Garbage-interrupted variations
The second bag is likely to be interrupted if a garbage hole spawned under L or I (on the column 7 or 10, respectively).
Under L (Column 7) |
Under I (Column 10) |
In the case of the interruption, one should change the setup or downstack. Some useful variations are listed below.
Under I
Minmal setup change |
Full-bag TSD |
I-saving TSD |
I-saving TSS |
Under L
All these continuations are unnecessary if the S piece was placed beforehand.
Full-bag TSD |
Full-bag TSD |
STSD |
I-saving TSS |
Perfect Clear with 2-Deep Garbage
If the opponent opens with a T-Spin Double or Tetris, it is very likely for the garbage hole to be 2-deep, leading to potential Perfect Clears.
The pieces saved for DPC Setups are also shown under the solutions, as these Perfect Clear solutions use 6 pieces from the second bag.
- Column 2: 4 minimal solutions, 23.61% PC rate.
Save O |
Save T |
Save T |
Save Z |
- Column 4: 1 minimal solution, 56.19% PC rate.
Save T |
- Column 5: 1 minimal solution, 23.33% PC rate
Save T |
- Column 7 (under L): 1 minimal solution, 25.71% PC rate
Save Z |
- Column 10 (under I): 6 minimal solutions, 54.88% PC rate
Save Z |
Save S |
Save O |
Save O |
Save T |
Save T |
See Also
- Stitch: The opener using the same initial build with different TSS direction and higher PC chance.
- SingleYou: Another TSS→TSD→Perfect Clear opening setup, also known as Single-Double Perfect Clear (SD-PC).