From Hard Drop Tetris Wiki
PC-Spin is a setup involving a T-Spin Triple which was then shortly followed by either a T-Spin Double or a T-Spin Single and ends with a 6th or 8th row Perfect Clear which was invented by a Hard Drop member named Aitch. This setup shares and has the same purpose as C-Spin. This setup was made for a reliable setup for a Perfect Clear after a few line clears. What's unique is that there are 2 quite different setups which was both named PC-Spin. One is for 6th row Perfect Clear, and the other is for 8th row Perfect Clear.
"I use the first when I just want a C-Spin with a chance for PC, and I use the second when I want C-Spin PC." - Aitch
6th Row Perfect Clear Setup
This version is used to achieve 6th row Perfect Clear after a T-spin Triple and presumably a T-Spin Single right after. This setup uses 3 bags in total.
First Bag
The first bag requires an early I,O, and J followed by L and S consecutively. This is probably one of the most piece dependant first bag setup in the Wiki, as the inventor said, "A big downside is the first bag is not very likely."
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Aknowledging the mirrored build is recommended.
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Second Bag
Thankfully, the second bag is far less infuriating than the first bag since it's has a decent chance to be stackable. O piece must be held until the bag ends, though.
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If holding an O until the end of the bag is simply not possible, try some of these stack. Although, none of them has a possible 6th row Perfect Clear chance.
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Third Bag
- Perfect Clear
There's a slight chance that a 6th-row Perfect Clear could be achieved followed after a T-Spin Single.
most likely - 1/7 chance |
2/49 chance |
1/49 chance |
- T-Spin Triple
If completing a Perfect Clear is not possible, making another T-Spin Triple is possible by using the held O from the previous bag.
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- Imperial Cross
The other alternative is to make an Imperial Cross using an S on the third bag.
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8th Row Perfect Clear Setup
This version is used to achieve 8th row Perfect Clear after a T-spin Triple and either a T-Spin Double or T-Spin Single right after. This setup uses 3 bags in total.
First Bag
Unlike the relatively infuriating first setup, this one could be fully stacked with only an early L or J.
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Even with a nice build chance, the mirrored stack might be needed.
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Second Bag
There are around 4 (or 6) continuations found or actually needed:
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93.85% - PC easy to spot
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95.12% - PC hard to spot
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96.94% - PC moderately easy to spot
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(I could be placed on either L or J or could be held)
If placed, 70.95% - PC easy to spot; If held, 81.71% - PC easy to spot
Third Bag
- Pattern 1
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(93.85%) 11 solutions; 7 shown (all solutions)
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- Pattern 2
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(95.12%) 36 solutions; 7 shown (all solutions)
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- Pattern 3
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(96.94%) 25 solutions; 7 shown (all solutions)
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- Pattern 4
(Pattern 4.1 & 4.2)
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(70.95%) 3 solutions (all solutions)
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(Pattern 4.3)
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(80.71%) 8 solutions (all solutions)
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External Links
- post made by Aitch regarding his setups