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.

Second and later bags
For the TOJ, ITZ and IST Cores, the placement of the second bag is fixed while for the rest, they are 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 followup 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.


 * IST Core: One can always stack their second bag like so. However, there are not as many continuations as the rest.


 * 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 (not shown).


 * 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.

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. If that also fails, it can be continued with a T-Spin Triple, Imperial Cross or STMB Cave.

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% ([http://fumen.zui.jp/?d115@zgg0zhB8glRpi0R4B8glRpB8R4C8hlB8ywH8wwG8Je?AgWZAzCQ9AFbcRAyv78Aw3CwBFbEwCzyaPCpAAAAzgRpilB?8h0AtRpglR4B8g0BtB8R4C8g0AtB8ywH8wwG8JeAAPZAT7f?2AFbcRAyv78Aw3CwBFbEwCz3HgCsAAAAzgRph0AtB8ilRpg?0BtB8glR4B8g0AtC8R4B8ywH8wwG8JeAAPZAT43UBFbcRAy?v78Aw3CwBFbEwCz3HgCsAAAAzgzhAtB8ili0BtB8glR4B8g?0AtC8R4B8ywH8wwG8JeAAPZAyCIOBFbcRAyv78Aw3CwBFbE?wCz3/VCpAAAAzgzhAtB8glRpi0BtB8glRpB8g0AtC8hlB8y?wH8wwG8JeAAPZAyCIOBFbcRAyv78Aw3CwBFbEwCMnzPCpAA?AAzgilR4B8i0glzhB8Rpg0B8R4C8RpB8ywH8wwG8JeAAPZA?xCoABFbcRAyv78Aw3CwBFbEwCPe/VCzAAAAzgilR4B8h0At?glzhB8g0BtB8R4C8g0AtB8ywH8wwG8JeAAPZAxCoABFbcRA?yv78Aw3CwBFbEwC6P9VCzAAAAzgilRpB8g0R4glBtRpB8i0?B8BtC8R4B8ywH8wwG8JeAAPZAx/35AFbcRAyv78Aw3CwBFb?EwC6vKWCzAAAAzgg0BtRpB8ili0RpB8glR4B8BtC8R4B8yw?H8wwG8JeAAPZAR+HOBFbcRAyv78Aw3CwBFbEwCTn/VC6AAA?AzgzhAtB8ilywBtB8glR4B8h0C8R4B8wwg0AtH8g0G8JeAA?PZAR4nABFbcRAyv78Aw3CwBFbUOCzXWWCpAAAAzgzhAtB8g?lRpywBtB8glRpB8h0C8hlB8wwg0AtH8g0G8JeAAPZAR4nAB?FbcRAyv78Aw3CwBFbUOCsXegCpAAAAzgQ4zhB8glRpR4ywB?8glRpB8h0C8hlB8Q4g0wwH8g0G8JeAAPZAR4nABFbcRAyv7?8Aw3CwBFbUOCs+bgCpAAAAzgQ4i0AtB8glRpR4whBtB8glR?pB8whAtC8hlB8Q4whg0H8whG8JeAAPYAYFjRASo78A1no2A?lsCSASo8VCvHkPCzgQ4ywAtB8glRpR4wwBtB8glRpB8h0C8?hlB8Q4g0AtH8g0G8JeAAPYAYleRASo78A1no2AlsCSAS4+V?Ca9KxCzgzhAtB8glRpi0BtB8glRpB8R4C8hlB8R4AtH8g0G?8JeAAPYAX1pRASo78A1no2AlsCSASITWC6vCMCzgRpilB8h?0AtRpywB8g0BtB8R4C8g0AtB8R4wwH8glG8JeAAPYAX1pRA?So78A1no2AlsCSASIjFDq+KWCzgg0ywAtB8glRpi0BtB8gl?RpB8R4C8hlB8R4AtH8wwG8JeAAPYAX1pRASo78A1no2AlsC?SASITWCan/wCzgQ4zhB8i0R4ilB8Rpg0B8glAtC8RpB8Q4B?tH8AtG8JeAAPYAWFsRASo78A1no2AlsCSAS4qgCMt3LCzgQ?4ywAtB8i0R4glBtB8Rpg0B8glAtC8RpB8Q4hlH8wwG8JeAA?PYAVVlRASo78A1no2AlsCSASIKWCat/wCzgQ4ywglB8h0At?R4ilB8g0BtB8RpC8g0AtB8Q4RpH8wwG8JeAAPYAVVlRASo7?8A1no2AlsCSASIaFDKNExCzgQ4zhB8h0AtR4ilB8g0BtB8R?pC8g0AtB8Q4RpH8glG8JeAAPYATVuRASo78A1no2AlsCSAS?IaFDKN8LCagRpHeRpCeh0BeQ4BtBewhg0CeR4Btglwhg0Ae?i0Q4ilwhglBewwg0AtRpQ4whglAexwBtRpR4hlAewwAtzhQ?4JeAAPAA 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