From Hard Drop - Tetris Wiki
Originally created by Wertj
Super Beta Spin Double (or abbreviated, SBSD) is a double T-Spin Double or sometimes, a T-Spin Double to STSD opener. However, there are many variants as the second 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 one will hold from the first bag and use the second bag to 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
The ZS stands for the piece that makes the T-shaped hole in the second bag. In this case, depending on which side one uses, the Z and S is used.
Main shape
Common Overhangs
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O overhang
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L horizontal overhang
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J horizontal overhang
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I overhang
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T overhang
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L vertical overhang
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J vertical overhang
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Ways to fill in the gap
Continuations
JS variation
LJ/O varitation
SBSD LJ variant
The LJ stands for the piece that makes the T-shaped hole in the second bag. In this case, depending on which side one uses, the L and J is used.
Main shape
Common Overhangs
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S overhang
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J overhang
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T overhang
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Ways to fill in the gap
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
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J, L and Z
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O, I and Z
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I, J and Z
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O, J and Z
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O, L and Z
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L, Z, TSS, S
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O, I, TSS, S
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I, J, TSS, S
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J, L, TSS, S
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O, J, TSS, S
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O, L, TSS, S
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TSS stands for T-Spin Single, so one makes the shape, T-Spin Single then add the S (Remember that the opposite always applies when doing the setup from the left side). Also, a dotted T piece means a T-Spin Single.
SBSD ZK variant
The ZK variant is named after Zack101155, Bassistunietd0's friend. 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
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LJ
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O (Needs overhang)
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LT
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IJ
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LZ
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Continuations
- Perfect Clear after 6 lines
LJ variation
Replacing TSD with STSD
If one does not pre-stack the overhang for the second TSD, they can make an STSD in 2 ways.
Main shape
2 ways to build
