Octupus Tea Cannon

The Octupus Tea Cannon (abbreviated as OT Cannon, known as Outlogic SD in the Japanese community, and previously known as Skim T Cannon.) is an opening setup with the pattern of Single-line Skim→TSS→TSD→Perfect Clear. It has 96.39% chance of Perfect Clear with either 4 or 8 lines. This setup is discovered and named independently by Japanese community and a Taiwanese player Octupus Tea, and the former had it discovered before the latter. Kerrmunism and Agent 1568AH also contributed to this page.

First bag
OT Cannon 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.

Hold I pattern
T and I on hold and/or in queue (setup rate 28.39%).

4-Line Perfect Clear
Pieces left for the second PC are listed below each solve.


 * Solution for the default pattern (11.43% PC rate)


 * 3 additional minimal solutions for the hold I pattern (21.67% PC rate with all 4 solutions)

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.

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.

Solutions with T-Spin
Alongside solutions A and F, the following two potentially have a chance to get a T-Spin and a Perfect Clear.

The combined PC chance is 58.21%, with a 42.22% chance of a T-Spin Single or Double.

First bag skimming pattern
There are 3 skimming patterns that result in the same remnants as the first bag defualt 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 Octupus Tea Cannon to be always stackable. Despite the different shape, the resulted setup is the same.

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.

Special continuation

 * Fumen

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.

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).

In the case of the interruption, one should change the setup or downstack. Some useful variations are listed below.

Under L
All these continuations are unnecessary if the S piece was placed beforehand.

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.


 * Column 4: 1 minimal solution, 56.19% PC rate.


 * Column 5: 1 minimal solution, 23.33% PC rate


 * Column 7 (under L): 1 minimal solution, 25.71% PC rate


 * Column 10 (under I): 6 minimal solutions, 54.88% PC rate