Work in progress

MDF, also known as (Mini Double Fractal) is an opener created by benmuga which makes a TSM or a 1 line skim followed up by a TSD and either a Perfect Clear with I J or L ending or a Fractal.

The idea of it is to create TSD's, and if possible, spike with the Fractal and continue making TSD follow ups. It has a variety of second bag combinations, so MDF can be used depending on the piece sequence or how the user wants to make the second bag; cheese, spikes or better TSD follow ups.

MDF can be used in various first bags, as long as they fit these dependencies:

1.- If L is used first, J must be used after Z.

2.- if Z is used first, S must be used after L.

Those rules applies not exactly right after your Z or L are placed, but they must follow that order independent of the other pieces on the same bag, and both rules are expected to be on different bags.

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Some tips to memorize the opener easily and have a higher success on MDF build are:

1.- DAS O all the way to one of the walls

2.- If O is placed on the right wall, Z comes next to O

3.- With the example of tip 2, on the left wall L and S comes together

4.- Always start building what is next O piece. (Z and J, or S and L if mirrored).

First bag

Basic formation

The first bag can be built like this (although you can do the TSM first and put the I later if needed.)

Octupie's variation

This one can assure you the TSM if J and L are early due to leaving no piece dependencies for the formation on both sides after placing both pieces

Second Bag

4-line Perfect Clear

You have a 16.17% chance of immediately getting a PC if your second bag starts with OTJ or OTI. Both solutions are shown below.

Fractal

If a PC isn't available, you'll be able to build like this, using one of two forms.

L -> O (L comes before O in the second bag)

O -> L (O comes before L in the second bag)

Third Bag and Onwards

T-Spin Triple

If you get your third bag T early (with only your L and I before it), you can build a T-Spin Triple.

This works regardless of whether you used early or late O for the second bag, but early O is preferred as late O requires you to use a few extra pieces.

Early O

Late O

Triple Fractal

This continuation will work only with the late O form and an early O in your third bag.

King crimson

4-Wide

6-3

TSS instead of finishing with TSD

In case if T is the first piece you need to place because you have an I piece right after, wasting T would be the only option to make the opener, and the only position for the opener that it have is placing the piece right where it spawns or one space to the right, depending on the pieces after I. After this you must hold I and follow the rules above.