Gamushiro Stacking

Gamushiro Stacking (ガムシロ積み) is a T-Spin Opener first created by Mr. Goods. It opens with a Triple Double Attack. In the first bag, J and O should come early. After a T-Spin Triple from the second bag is performed, it may lead to a Perfect Clear opportunity (99%) or other continuations. Sometimes, one will do a TSS or TSD before the PC. If one considers the mirrored version, it is always possible to stack this opener as long as O comes early.

Second Bag
In the second bag, one can stack it in one of four ways. The first way is the most preferred. In all cases, the Z piece can be placed in even though the S might be there already.

Third Bag
There are various continuations for the third bag.

Perfect Clear
This is usually the best continuation. In some cases a T-Spin Single or a T-Spin Double may be done beforehand. If one gets an early T in the third bag, they may do a TSS immediately.


 * Form 1 - 71 solutions, 99.09% PC Chance


 * Form 2 - 27 solutions, 72.82% PC Chance (these solutions also apply to one of the setups in PC-Spin)


 * Form 3 - 24 solutions, 49.37% PC Chance

Other continuations

 * T-Spin Triple


 * Imperial Cross


 * Center 4-wide


 * Nil-cross


 * Trinity

Perfect Clear after 10 or 14 lines
In this case, one can go for a Perfect Clear after 10 lines or 14 lines. There are some dependencies in the third bag: S before J, O before Z then I. At that point, one will have a chance to make a Perfect Clear after 10 lines. If this fails, then 14 lines is always possible, provided that S comes before Z in the fourth bag. The I, J, L and O pieces can be placed in any order. The solutions are the same as Riviclia's Pelican.

Double Triple Cannon (2)
In case of the fourth form, one can make a Double Triple Cannon or a Double Triple Cannon 2. In the third bag, J should come before S and Z before O. In the fourth bag, if T comes late, then DT Cannon is possible. If T comes early then DT Cannon 2 is possible.


 * Double Triple Cannon 2