C-Spin

The C-Spin (TKI積み) is a kind of Triple Double Attack. It is invented by TKI. This name is given because of the "C" shape that is formed. As the name suggests, it results in a T-Spin Triple which is usually followed by a T-Spin Double within three bags. As an opener, it is most often built with an ZST core whereas L and J are used to build the overhang. There are other cores made with different pieces.

The C-Spin

First Bag

ZST Core

TOJ Core
(TKI signature)

ITZ Core

ZOT Core

ZTI Core

Second and later bags

Depending on the setup used, some setups have a fixed second bag.

ZST Core: There is no fixed way of stacking the second bag, so a player must stack ad-lib. Below is an example, with a Trinity in the third bag.

TOJ Core: Only J should come before I. The O, S and Z pieces can always be placed in one of four ways.

ITZ Core: The S and I should come early and the J, O and L is placed in one of two ways.

ZOT Core: Again, there is no fixed way of stacking the second bag, so a player must stack ad-lib. For this example, the L, Z, S and J can be placed in one of two ways. If one is able to keep the O in hold, then they can make a T-Spin Triple in the third bag.

ITZ Core: It is better to use the I piece on the right first and use the second bag's I to make the notch.

C-Spin Perfect Clear

ZST Core

Discovered by player Chopin. If you can manage to get a flat 6-high-mino stack, you might have a chance to trade the T-Spin Double for a Perfect Clear.

Here are all the solutions, arranged by probability.

After 8 lines

If you cannot execute a PC after 6 lines, there still may be a chance of a PC after 8 lines.

Here are some solutions.

TOJ Core

One may assemble the C-Spin Perfect Clear using the TOJ Core (TKI signature). In the second bag, O must come early. This form has better Perfect Clear solutions than the ZST Core C-Spin since the chance of doing a T-Spin Double before Perfect Clear is significantly better.