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The TKI 3 Opener can be continued with a Perfect Clear after 8 total lines (3 bags) after 2 T-Spin Doubles. Because there are so many ways you can make a Perfect Clear continuation, especially for Castle Top and Fonzie variations, continuations with at least 85% PC rate are shown. If applicable, a Perfect Clear after 6 total lines will also be accounted.
Because there is not a fixed way to make a Perfect Clear setup, various forms listed here are explained concisely. It is recommended that you use only a few convenient setups because it is inefficient to memorize everything.
The significance of the 3-bag Perfect Clear build is to check the opponent's 4-line combo build (4-Wide). This is because with TSD-TSD-Perfect Clear, you can send 19 lines (+1 and 2 lines as a combo). If the opponent builds a 4-line combo build and you use the TKI 3 Opening, the probability of losing is quite high if you have similar skills. This setup can lower the chances of that defeat.
Castle Top variation
Basic Setups
- Z → O and L → S (100% PC rate, 12 minimal solutions + ɑ): In this case, the player can make a Perfect Clear after 6 or 8 lines. In the case of 8 lines, place the I piece on the very left. All solutions are shown.
- O → J and I → L (99.92% PC rate, 17 minimal solutions)
All solutions can be found here.
- SL → IO (99.64% PC rate, 33 minimal solutions): Normally, the J piece would be around the O piece, and therefore get a 100% PC rate, but in this setup, there is a gap beneath the O piece instead since the J piece is placed on the very right.
All solutions can be found here.
Okey's Plank
This is an uncommon continuation from Okey_Dokey. There is a horizontal I piece placement in the second bag which clears a single line. That line clear can happen before or after the second T-Spin Double.
The playfield is pretty empty after the second bag, thus offers a good opportunity to downstack. Alternatively, a Perfect Clear can always be achieved in the third bag. This Perfect Clear is so easily achievable because the single line clear in the second bag leaves an odd number of cells empty in the row below (see Parity).
Fonzie variation
Basic Setups
- SL → I and Z → J (100% PC rate, 17 minimal solutions + α): In this case, one can make a Perfect Clear after 6 or 8 lines. If going for 8 lines, place the O piece on the very right.
All solutions can be found here.
- L → S → I and J → O / SL → I → J + O (100% PC rate, 16 minimal solutions)
All solves are available here.
- Z → IL and O → J (99.96% PC rate, 14 minimal solutions)
All solutions are available here.
- SL → IZ and O → J / Z → O → J and L → I (96.79% PC rate, 14 minimal solutions)
All solutions can be found here.
Flat Top variation
- O → L (J on hold, 100% PC rate, 11 minimal solutions + α): The most ideal way to get a Perfect Clear after 6 or 8 lines. All solutions are shown.
- J → O (L on hold, 99.96% PC rate, 15 minimal solutions + α): The second-best way. If you want a Perfect Clear after 6 lines, keep the L piece on hold.
All solutions can be found here.
- L → I (J on hold, 99.09% PC rate, 19 minimal solutions)
All solutions can be found here.
- J → O (S on hold, 98.10% PC rate, 20 minimal solutions + α): This has the same piece dependencies as the second-best way, except that the L piece is used instead of the S piece.
All solutions can be found here.
Basic Setups
- J → O → L (93.57% PC rate, 15 minimal solutions): If the S piece comes first, the rate will be 99.17%.
All solutions can be found here.
- O → L → J (90.36% PC rate, 8 minimal solutions): If the J piece comes first, the rate will be 98.61%. All solutions are shown.
Source
The bulk of the description seen on this article were taken and translated directly from the Korean Tetris Wiki:
