C-Spin Perfect Clear

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The C-Spin Opener can be continued with a Perfect Clear after 8 total lines (3 bags, 20 pieces) after a T-Spin Triple in the second bag, and sometimes a T-Spin Single or Double in the third. The most ideal openers to stack are the ones with a vertical T piece, though the ZST Core is also explained here.

Because there are many ways to stack the second bag, it is recommended that you use only a few stacks because it is inefficient to memorize everything.

ZST Core

This continuation is discovered by the player Chopin. If you can get a flat 6-high-mino stack, you may have a chance to trade the T-Spin Double for a Perfect Clear.

If you cannot execute a Perfect Clear after 6 lines, there still may be a chance of a PC after 8 lines (75.67% PC rate). If that also fails, it can be continued with a T-Spin Triple, Imperial Cross, STMB Cave or a T-Spin Double.

TOJ Core (TKI Signature)

For the TKI Signature C-Spin, the first bag can be stacked in 2 ways, mainly depending on the placement of the S and J pieces. The latter has the most continuations, so it is therefore the most unstable.

TOJ Core 1

• L → I (O on hold, 97.50% PC rate, 35 minimal solutions): The most ideal way to stack the second bag for a high chance of achieving a Perfect Clear. It will also send at least 15 lines if you can score a T-Spin Double before the Perfect Clear (not necessarily in a combo).

If you must place the O piece, place it on the overhang, and you will get a 94.09% success rate. Otherwise, the S, Z and O pieces are arranged to form the same shape, and overall, a 93.06% success rate. The overall setup will work if the I piece comes after L.

94.09%

93.06% (SZO varies)

• O → ZL (95.00% PC rate, 23 minimal solutions): There is a good chance the player can do a T-Spin Double before the Perfect Clear, and if the O piece comes first, the chance of achieving a Perfect Clear would be 99.17%.

TOJ Core 2

• Z → S → I or OS → Z → I (L on hold, 100% PC rate, 77 minimal solutions): The most ideal way to stack the second bag, and you will always be able to achieve a Perfect Clear.

If you must place the L piece, you can either place it vertically (95.00% success rate) or horizontally (89.25%). In the case of the former, the solutions are the same as the final setup listed in TOJ Core 1.

95.00%

89.25%

• Z → L → S + I (O on hold, 99.44% PC rate, 40 minimal solutions)

If you must place the O piece, it is best if you can place it on the very right, as this will give you a 97.22% success rate. Otherwise, the O piece can also be placed on the cavity (93.02%) or overhang (88.02%).

97.22%

93.02%

88.02%

• Z → OI → S or Z → OS → I → L or OS → Z → I → L (99.68% PC rate, 14 minimal solutions): This is the most ideal way to stack the entire second bag.

TZJ Core

Here is another way of stacking the first bag. This will always work if the I piece comes early, although TKI 3 is more appropriate for that dependency. The J piece is in the hold.

This pattern has many continuations depending on the piece order of the second bag.

• S → LO → Z (96.90% PC rate, 12 solutions): The S piece can be placed even if you have placed OLZ.

• ZO → L → S (93.02% PC rate, 10 solutions)

• O → ZL, S → I (91.19% PC rate, 7 solutions)

• S → Z → O (89.33% PC rate, 21 solutions)

• L → O, I → Z (89.25% PC rate, 12 solutions)

• I → L (88.02% PC rate, 11 solutions)

• S → L, OI → Z (80.00% PC rate, 8 solutions)

External Links

• Post about 8-row Perfect Clear Setups (see C-Spin)