After doing this for many weeks (3 weeks) with 80% average success rate, I've decided to share this. I know I am the first to invent this, and now it has spread around the internet.
I've succeeded in optimizing a Terran build that can utilize a fortress rush.
It involves using two probes for gas and the rest to get minerals. Make another base at 400 minerals, and attack before your base is finished.
The timing is in the replay that I have attached. If their base is a long way, you can lift off sooner. Make sure you remember to make the Engineering bay
after lifting off. When you land, put your scv in auto-repair mode, and make the fortress ASAP.
Then, when the fortress finishes, start making scv and repair. Make some turrets in case Voids or Hellions come after you.
