The CHATEAUpener is a TSS>TSD>TSD>TST opener that have a high Perfect clear chance. It was created by YackTenebreux. It's important to note that, even if it can be done without 180° rotations, it can be built more often with this feature.

1st bag

The 1st Bag is the same as SingleYou.

2nd Bag

This shape can always be built.

3rd Bag

This setup is called Magic Key (rarely use in our days). LJ placement needs to be ajusted according to the queue.

If you are high in your board and you need to downstack, you can just take a T-spin Triple :

This TST setup can always be stacked.

4th Bag

If you can't make the box with the S piece, just use the O. If you can't do either of them, you can freestyle, it's not hard.

5th Bag

14 lines Perfect clear

This field has a 99.80% perfect clear rate. This solution is the most common one, but you can find the rest of them in this fumen [1].

Others continuations

Some ideas to continue :