From Hard Drop Tetris Wiki
Trinity (OR Abyss) is a T-Spin setup that allows for three T-Spin Doubles. This is a fancy setup, although arguably if you can do your T-spin earlier it is preferred. If no T is in sight, you may opt to invest into forming a Trinity. Also note that not all Trinity setups will give you the option of TSD Declined. Depending on which side your "hang" is on, you may be left with a S-Spin Triple or Z-Spin Triple instead.
Abyss
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3 TSD
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TSD Declined
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TKI 3 Replacement
Main Article: TKI 3 Setup
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Mid-Game setup (TSD→STSD)
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Chopin Signature Trinity
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Continuation into DT Cannon
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Rather than using your I-mino on the top left to complete the last T-Spin double, you can instead use a J and a hang to transform the remaining shape into a DT Cannon.
TSD Declined or Approved?
Depending on which side your hang is on, beware of substituting your T-Spin Double.
Will give TST |
T-Spin Single |
T-Spin Triple left behind |
No TST |
T-Spin Single |
Z-Spin Triple left behind |
With Twist bonus available, the result is actually not bad at all.
See Also: Other Spins
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Z-Spin Triple |
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J-Spin Double left behind |