A Perfect Clear (PC) means having no filled cells left after a line clear.
How to make a Perfect Clear?
This guide tries to give a higher chance of performing a Perfect Clear. The best scenario is to attempt it at the beginning of a game, when your opponent has not finished building up their stack. If you succeed, this usually becomes a K.O.
Note that this guide does not guarantee a 100% chance of success in making a Perfect Clear. It also requires a lot of understanding and practice to make it work in a game. However, failure is not as bad because you can continue making a stack for T-Spin or Tetrises.
The process contain 2 steps.
Create a stack that makes a perfect clear more possible
Look for tetromino combinations that will make it succeed.
Stack for a Perfect Clear
This is a stack that makes a Perfect Clear much more likely, since it is built with every tetromino from the first bag and has 12 holes, to fit 3 tetrominoes from the second bag.
In the first bag, I, L, O and J-Block form a square. You can also split the square into an LOJ rectangle and an I-Block separate from the rectangle, which works the same.
S, T and Z-Block form the following shape. Note that you should get T before Z to make this shape.
It is possible to build the stack in other ways.
Mirrored setup:
Using the Next 3 Tetrominoes
Assume you have built your stack like this:
The next thing to worry about is what the next 3 tetrominoes will be. Note that you can use hold piece to hold a tetromino. As a Tetris player, you should know that the sequence is very important in many cases.
Examples
LTI
A solution is shown here. This solution will work regardless of the order of the tetrominoes. This solution requires an L-Spin. I-Block can be dropped at any time.
Rotate an L-Block counterclockwise and soft drop into the desired position:
Then rotate clockwise once:
Then drop an I-Block (or T-Block if it comes next):
Resulted in a line clear making a Perfect Clear position for the T-Block:
SLZ
For this solution, S should come first. Order of Z and L does not matter. If L comes before Z, it requires a Z-Spin.
Rotate an S-Block and soft drop, then rotate again, as shown:
Then drop L-Block into the desired position:
The hardest part is to do a Z-Spin.
Rotate counterclockwise and soft drop to this position:
Spin counterclockwise again to kick into this position. Sometimes, it may not go in. If it does not go in, spin around until it kicked in. This requires some practice.
All solutions
Conclusion
There are more scenarios than this. And if you do a mirror version, you would change the tetrominoes as well. The success rate is 61.2%, but if you do it fast enough there is nothing to lose. After failure, you can continue as normal. Make sure you do this before your opponent sends garbage.
