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.

C-Spin Opener

First Bag

ZST Core

TOJ Core (TKI signature)

ITZ Core

ZOT Core

ZTI Core

Second and later bags

For the TOJ and ITZ Cores, the placement of the second bag is fixed while for the rest, it is stacked ad-lib.

• 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 one can manage to get a flat 6-high-mino stack, they might have a chance to trade the T-Spin Double for a Perfect Clear.

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

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.

Here are solutions with a T-Spin Double.

If L comes early, one can use the below stack. The O, S and Z pieces can be placed in any order. After that, it can result in these Perfect Clear solutions (among many others):

TZJ Core

Here is another way of stacking the first bag. This will always work if I and Z come early.

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

• 89.25% (12 solutions)

• 96.90% (12 solutions)

• 80.00% (8 solutions)

• 91.19% (7 solutions)

• 93.02% (10 solutions)

• 89.33% (21 solutions)

• 88.02% (11 solutions)

Other stacks

Here are some useful setups for other cores. The last two have the same solutions as the 6-line ZST setup.

• ITZ Core

• ZOT Core

• ZTI Core

See also

• Triple Double Attack
• Triple Donation Double Attack
• Opener

External Links

• post about 8-row Perfect Clear Setups, especially C-Spin.