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 at least 96.21% chance of Perfect Clear with either 4 or 8 lines. This setup is discovered and named by a Taiwanese player Octupus Tea.

First bag
OT Cannon works the best with early S (or Z when mirrored) and preferably early I. The setup rate is 73.81% (3720/5040) when counting both orientations.

If the I piece does come late, one can skim first and utilize an I-Spin to twist it in.

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


 * If the first four pieces of the second bag contain I, J and L, the first bag's T piece can be spun horizontally and followed with a 4-line Perfect Clear (11.43% PC rate).


 * There are also four other minimals for late or held I piece from the first bag (PC rate is hard to estimate due to first bag I piece placement).

Second bag
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 42.22% with T-Spins, and 58.21% without T-Spins.

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.

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.