# Fractal (ダブルダガー)

A TSD → TSD setup. Called "double dagger" in the Japanese community.

Fractals can also have a gap between the two T-Spin shapes:

## Building Fractal

Fractals are usually built when you don't anticipate getting a T soon. There are four main ways to build a Fractal.

### Building on top of a TSD

Fractals are most often and most easily built on top of an existing TSD.

This pattern of repeating LSJZ is a useful stacking pattern in general and is the basis for LST Stacking, which is essentially building Fractals on top of Fractals.

The above pattern can be built with alternate pieces:

See LST Stacking where these alternate pieces are more extensively covered. Example:

### STMB Cave

Using STMB Cave and Co. is another a popular way to build a Fractal.

STMB Cave can be used over an imcomplete TSD to create something called a Fractal Cave:

### LT Stacking

LT Stacking is a stacking method where you repeat L on the left side while using the T to do a T-Spin Double. No one uses this stacking method anymore in Ultra, but it is still a useful technique to use to create Fractals.

The cleanup after doing the two TSDs is tricky so it's relatively rarely used. Example:

As a sidenote, the L will leave a block on the column it was placed, which is useful in several situations:

### LJ Prop

This is perhaps the least commonly used technique to build a Fractal because it requires more planning of your pieces. Reminiscent of building DT Cannons. Examples:

This method works well in conjunction with Fractal Cave as a follow-up to build a Fractal.

Just like DT Cannon, alternate pieces can be used to make the same shape that the L makes.

## Tips

A common mistake that people make while building Fractals is building the overhang on the wrong side:

For this example, the resulting field is clean enough to recover with a DT Cannon, however.

Compare Fractal with DT Cannon:

Fractal would be the better option in the majority of cases if there's an extra row underneath.

## JZ Stacking

This stacking pattern which utilizes STMB Cave can be used to create shapes similar to Fractal.

Note that repeating IJ makes the same shape:

## See Also / References

### Imperial Cross

See the Imperial Cross page to read about some differences between Fractal and Imperial Cross, another similar TSD → TSD setup.

### References

- テトリステンプレ集＠テト譜 on Fractal
- Tetrisch on Fractal
- Harddrop Wiki on JZ Stacking and Fractal