Octupus Tea Cannon

The Octupus Tea Cannon (abbreviated as OT Cannon, 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 by a Taiwanese player Octupus Tea. 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.

The setup rate is 73.81% (3720/5040) when counting both orientations.

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.

The setup rate increases to 85.91% (4330/5040) when including all these skimming patterns.

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.

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