From Hard Drop Tetris Wiki
SZ Double Triple Attack, is a T-spin combo designed by player XaeL. This setup is essentially a T-Spin Double followed by a T-Spin Triple. A player utilizes the SZ ST stacking setup followed by an extra piece to create a T-spin triple. This opening is an effective alternative to fiddlesworth in newer games which nerf T-spin singles to the point that the fiddlesworth opening is sends much less garbage. This setup is especially useful when the beginning two pieces are S and Z.
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After the setup
After the T-spin triple, a T-spin single remains. If the stack is reasonably high, you can build up further to unleash a large combo. Alternatively, you can do a STSD transfer.
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Transfers
STSD
This transfer can only be done if there are two blocks above the overhang.
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Alternatives
The following are alternatives when faced with SZ starts