Skimming

Skimming is a method where a player does a non-Back-to-Back line clear to make the stack more favorable. This page will focus more on skimming used for offense in the current guideline Tetris.

Introduction

In modern Tetris, skimming has a couple of utilities:

  1. As mentioned before, the point of skimming is to lead the field into a more favorable stack. This gives the player more choice on how to place the subsequent minos such as building a TSD.
  2. Line clears mean a lower overall stack. A lower overall stack means the ability to accept more incoming garbage lines. This is good for temporary defense.

However, skimming has three important drawbacks:

  1. The player loses Back-to-Back.
  2. Non-Back-to-Back line clears inherently have lower attack efficiency.
  3. The player has to deal with an added line clear delay.

Therefore, skimming is not optimal for attacking and should be reserved as a defensive measure.

Identical Function Minos

Due to how minos are structured, there are several groupings of minos that serve identical functions for skimming.




credit to mkomiz for the diagrams

Basic Skimming

Tetris


Looks like this. You can achieve the same field with T or J.

TSD


The most commonly used TSD skimming looks like this. You can achieve the same field with a Z. Not too bad because the double line clear sends 1 line and the TSD restarts Back-to-Back.


credit to kazu for the example

This is another skimming that is relatively often used, mostly as a compromise for not having the right pieces to complete a Parapet.

Here are some other situational setups.

Named TSD Skimming

These are some named skimming techniques that result in a TSD. You'll probably encounter these every once in a while.

Pierce

貫の技法. This skimming pattern with an I is useful to know.


For this example, you would be rotating the I mino counterclockwise twice.


WC Plowshare

WC鋤の刃. Useful when you need to do a TSD as soon as possible but you don't have the right mino to complete the TSD shape in certain situations, e.g., in a field like below where you don't have an I coming soon.


Dejavu

デジャヴ. Mostly used for downstacking instead of building a TSD because a Tetris is usually a better option if you're trying to attack. Line clearing this way is also used in perfect clear solutions such as the one for MKO.


See Also / References

This section has some links that mention these terms which can be confusing because they have the same dictionary meaning.

Prophecy T-Spin involves setting up a T-Spin overhang in advance. That's all it means. Forecasting a T-Spin means that a player stacks in a way where T-Spin slots will emerge after line clears. One way to forecast a T-Spin is to utilize skimming. Using Back-to-Back line clears to forecast a T-Spin would be bigger brain.

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