LaundrySpin is an opener that was discovered and developed by Nakamura alongside members of his research server like mLurker, Winterfrost, HDChung, zera, and Ivan28283. The opener resembles a misdropped SDPC and can be used instead if you happen to misdrop like so. It was named LaundrySpin due to the floating mino residue after the T-Spin Single, allowing you to rotate the J or L continuously around the mino in a washing machine motion. Despite its looks, it is very versatile and has a slightly higher 8-Line Perfect Clear chance than the original SDPC opener it was based on.
First Bag (TSS)
O needs to come before S and Z before L (O before Z and S before J in the mirrored version).
Second Bag (100% TSD)
You will always be able to perform this TSD if you have 180° spins.
You may need to perform this unusual spin if J comes late.
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Spawn
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Clockwise
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Soft Drop
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180°
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Clockwise
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Third Bag Main Route
The residue after the 2nd bag TSD has a 97.94% chance of achieving an 8-Line Perfect Clear with 15 minimal solutions. The solves are listed below in descending order of PC chance along with what piece they save for DPC.
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38.65%, Save J
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32.38%, Save T
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23.81%, Save S
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22.22%, Save T
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22.22%, Save S
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19.05%, Save T
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18.81%, Save O
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18.81%, Save Z
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18.81%, Save S
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17.86%, Save Z
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14.29%, Save I
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12.86%, Save O
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10.48%, Save Z
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10.00%, Save O
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If you cannot achieve a perfect clear or choose to extend the opener, you can always make a T-Spin Triple from this board state with 2 paths, both of which lead to a 100% 14-Line Perfect Clear.
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2nd Bag Residue
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O before L
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TST
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Residue
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3rd Bag Residue
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TSM, S before L
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TSM, L before S
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Residue
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You will always be able to perfect clear on this field with 11 minimal solutions, listed below in order of highest chance solve to lowest.
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45.56%
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37.46%
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31.27%
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26.11%
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21.35%
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18.41%
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18.33%
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There is another build one can set up that has a slightly lower perfect clear chance but leads to other follow-ups.
This field has a 93.10% chance of achieving a perfect clear with 18 minimal solutions.
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49.96%
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30.32%
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26.67%
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23.17%
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16.67%
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16.67%
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14.44%
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13.33%
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11.51%
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10.79%
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9.84%
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7.78%
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6.35%
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5.71%
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If you choose to forgo the perfect clear or one is not possible, you can choose to continue into an STMB Cave or Trinity Loop.
The main path for the trinity loop may need some waiting for gravity depending on the queue for the 7th bag, so if the queue is inconvenient one can choose to either freestyle or continue the trinity with a different build.
This field has a 94.92% chance of achieving a 22 line perfect clear.
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2nd Bag Residue
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L before O
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TST
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Residue
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3rd Bag Residue
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TSM, L before S
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Residue
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3rd Bag Residue
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TSM, S before L
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Residue
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Switchback PC Route
This path can always be built up to the 4th bag, where some variation may be needed if the main build fails.
This field has a 100% chance to perfect clear with 9 minimal solutions.
ST Route
This was inspired by Sailboat SST and is a little less stable than the other routes. It can always be built with 3 paths but if you have to resort to the 3rd path you should probably just go for a different route.
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2nd Bag Residue
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O before J
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TSS
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Residue
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2nd Bag Residue
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L before O
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TSS
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Residue
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2nd Bag Residue
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J before O before L
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TSS
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Residue
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