Perfect DT

Perfect DT (Perfect Double Triple / パーフェクト DT) is a setup invented by a Japanese player named Yuu. It resembles a TKI 3 Opening but with the L placed upright on top of S which makes it looks kind of like a "wing". Usually made to achieve a T-Spin Double which could then be continued with T-Spin Triple without wasting a single T and usually ends with 8th row Perfect Clear. This is one of the only discovered setups that could achieve 8th row Perfect Clear without wasting a single T (other setups like Albatross Special and Pelican could only do Perfect Clear after 10 cleared lines). This setup could be made with an early I and S have to come before L. Perfect Clear after 14 lines is also possible.

First Bag

Mirrored Setup

Normal Setup

Second Bag

T-Spin Triple

This setup is usually continued by T-Spin Triple. Notice how JI and LO could be swapped which increases the chance to score a T-Spin Triple without wasting a single T. It uses a very unusual overhang but it works nonetheless.

If J comes early but Z comes before I, one could still create a T-Spin Triple with S placed vertically on top of L.

T-Spin Double

If it is impossible to make a T-Spin Triple on the second bag, one could still continue with a T-Spin Double. The chance to stack this one is 100% because O, S and Z can be stacked in any order.

The O, S and Z pieces can be stacked in one of four ways:

It is possible to continue the T-Spin Double with Type 1 ST Stacking. Here is an example:

Third Bag

Normal Setup

If you did the normal setup, then there is a 75.87% chance to do a Perfect Clear after 8 lines. 15 of the 18 solutions are shown. Link to 18 solutions: [1]

Mirrored Setup

On the other hand, if you do the mirrored setup, then there is 74.33% chance that it could end with 8th row Perfect Clear. The probability is lower because fewer I-Spins work there.

Link to 18 Solutions: [2]

External Links

• Japanese Tetris Wiki Page explanation of Perfect DT
• Tistory's in-depth page about Perfect DT