Octupus Tea Cannon

Under Construction

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 can be built with early S and I, and 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 piece that will be saved (used for DPC) are also shown alongside each solution.

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.

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 (in the 7th or 10th column, 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.