LST Stacking

🚧 This article is a work in progress and is incomplete at this time.

credit to kazu and nrte96 for many of the examples used in this page

A very practical stacking method that can be used both in versus and ultra. Called LST (LST) stacking because you repeat L and S on the left side while using the T to do a T-Spin Double.

LST Stacking (left) is different from ST Stacking (right) where you only use S on the left two columns. Note how LST Stacking is a bit denser—this leads to a higher efficiency ceiling.


The basic idea is to repeat the following pattern with LSJZ

Basic Steps

Step 1: Create an overhang with L or J and then do a TSD.

Step 2: Build the rest of yellow

Step 3: Create an overhang with S or Z and then do a TSD.

Step 4: Build the rest of orange. Repeat from Step 1.


When your T comes late on Step 1, you can skip the TSD and build a Fractal.

This works because in a sense, LST Stacking is Fractals stacked on top of Fractals.

Opening from Flat Top TKI

The flat top TKI opener is undoubtedly the most popular way to start the first two TSDs before transitioning to LST Stacking.

First and Second TSD

Third TSD

LST starts from the third TSD and onward. These are some commonly used patterns for the third TSD which will help you transition into LST Stacking.

Pattern 1

Can you spot the hidden Js?

Alternate pieces

The easiest way to do LST Stacking would be to repeat LSJZ like above. However, this is often not possible and therefore, in those cases, the right part is built in alternative ways. Here are some examples.


These alternate pieces do not mix between the overhang part (orange) and the yellow part.


These patterns are a bit more advanced as it mixes the overhang part (orange) and the yellow part.

Common Mistakes

These are two common mistakes which would terminate LST because it is impossible to place a block on the spots marked purple to continue LST:

Other Stacking Patterns

So far, this page has covered pure LST Stacking, which is often enough if your goal is to do around 12 consecutive T-Spin Doubles. ... This section will cover alternative stacking patterns that are often incorporated into an LST ultra run.

These stacking patterns are less dense than LST Stacking, and incorporating these can be a good way to balance the height of your overall stack. However, overuse of these patterns can result in a loss of efficiency so they should be used sparingly.

All of these patterns eventually converge back to LST Stacking.


Easiest to return back to LST. Two ways to incorporate it.

Use Case 1. Used when you have piece constraints. Basic idea:

Compare with the traditional way which would require filling in an additional block (i.e., needing an additional piece) marked purple

Use Case 2. STMB can be used to create Fractals

Orange Part

The most common alternate stacking pattern. Building another orange part on top of an existing orange part (right) instead of building a yellow part on top of an existing orange part (left).

SZ Prop

There are two paths that are basically a mirror of one another.


There are two ways to incoroporate STSD.

Method 1.

Increases your overall height of your stack by a couple lines and has specific piece dependencies for returning back to LST. Basic idea:

Method 2.

Safer than the first method and it's easier to return back to LST in some cases. Basic idea:

Note: Using an I to create a wall for the TSD kick (or any other piece combination making the same height) creates specific piece dependencies like the first method when trying to return back to LST.


Using an I

Involves using a I and a Z to lift up your stack. The right orange part is built on top of the yellow part. Knowing this technique is useful in general stacking as well.


credit to firestorm58 for these examples


It is not uncommon to do the below donation depending on your queue. If you do a TSD, you are required to place a Z like the third picture below, either before or after the TSD, as a first step of returning back to LST.

If you have no Z on your queue, you can do a TSS which would get rid of this Z dependency and help you immediately transition back to LST.


This section covers some things to consider once you become comfortable with consistently doing around 7 or more T-Spins with LST.


Once you make this shape, it is easy to fall in the trap of repeating the following pattern:

This is undesirable because of several reasons. First, you become dependent on two specific pieces. In this case, you are dependent on 1 piece of L and 1 piece of S. Dependency on specific pieces means lesser flexibility, i.e., a lower chance of continuing your LST Stacking.

Second, you can't increase the height of your stack on the 2 side, which is necessary once you reach around bag 10. Therefore you will eventually overstack on your 7 side. This creates a vicious cycle—it is harder to escape this pattern once you overstack on your 7 side, and because you're continuing this pattern, you will overstack on your 7 side.

Therefore if you end up making this shape, try to escape it as soon as possible.

Escaping from S

Escaping from L

Balancing your stack

As mentioned above, balance between the 2 side and the 7 side is important. If you stack too much on the 2 side, you won't be able to make a T-Spin because the 7 side will be too low. The opposite can also happen. Your stack can become unstable by stacking too much on the 7 side.

Around Bag 10, you will likely need to increase the height of your stack on the 2 side. A popular way to do this is by placing both a S and a Z like so:

  • Usually know when you're forced to create Fractals.
  • Only the case when using a strictly traditional LST
  • Other ways to increase stack
  • Examples: Mixing ST, using STSD.

Case Studies

Case 1


In the above field, the player cannot continue on a traditional way like below because there isn't a place for Z and two Os, which are on the queue, to go. The player instead decides to build a STSD in an attempt to continue LST.

Case 2


It could be tempting to place your L like below, but there isn't a S on your queue in order to make a T-Spin shape. The player places an O instead which allows him to use JZ to create a T-Spin shape.


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