SBSD

Created by Bassistunietd0

Super beta spin double

Super beta spin double (SBSD for short) is a double TSD or (Sometimes) a TSD to an STSD, opener. However, there are many variants as the bag can be tricky when it comes to building on top of the first bag. The setup relies on a late T as the T is what you will hold from the first bag and use the second bag and build the second layer according to the variants. Although the main name of the setup is Super beta spin double, the community often refers to it as Shadow-blade spin double named after a Notorious Reddit poster as the idea of the setup was sparked by him.

SBSD ZS variant

ZS stands for the piece that makes the T-shaped hole in the second bag. In this case (depending on which side you use) the Z and S is used.

Main shape

Common Overhangs

O overhang

L horizontal overhang

J horizontal overhang

I overhang

T overhang

L vertical overhang

J vertical overhang

Ways to fill in the gap

JS

LJ

O

IJ

LI

JT

LT

T-Spin Triple

Perfect Clear continuation

From JS
In the third bag for this case, O or J piece must come early.

From LJ

SBSD LJ variant

LJ stands for the piece that makes the T-shaped hole in the second bag. In this case (depending on which side you use) the L and J is used.

Main shape

Common Overhangs

S overhang

J overhang

T overhang

Ways to fill in the gap

ZJ

ZI

TI

OJ

OS

OT

SZ

SBSD E2bT variant

In this case, E2bT stands for early second bag T as there is only 1 possible early second bag T situation that is viable which is in the LJ variant. This should only be used as a last resort as it is highly ineffecient.

Main shape

Common builds

J, L and Z

O, I and Z

I, J and Z

O, J and Z

O, L and Z

L, Z, TSS, S

O, I, TSS, S

I, J, TSS, S

J, L, TSS, S

O, J, TSS, S

O, L, TSS, S

Note that TSS stands for T-Spin Single, so you make the shape, T-Spin Single then add the S (Remember that the opposite always applies when doing the setup from the left side). Also note that a dotted T piece means a T-Spin Single.

SBSD ZK variant

ZK variant is named after a good Tetris friend of mine, Zack101155. He was the one who found this variant while testing the setup in 20TSD mode. In this case. An S/Z piece is added in a unique way to create a new T shaped hole.

Main shape

Common builds

LJ

O (Needs overhang)

LT

IJ

Perfect Clear continuation

From LJ

Replacing TSD with STSD

If you do not pre-stack the overhang for the second TSD, you can make an STSD in 2 ways.

Main shape

2 ways to build