ST Cannon

Under Construction

The ST Cannon, in which "S" stands for "Skim", 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 96.21% chance of Perfect Clear with either 4 or 8 lines. This setup is discovered and named by a Taiwanese player Octupus Tea.

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

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.

Second bag

 * Shachiku Train (Mechanical TSD)
 * Instead of a third-bag Perfect Clear, 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.