10 – Supply depot (at wall)
12 – Barracks (at wall)
13 - Send SCV scout
15 – Orbital command upgrade
15 – Marine
16 – Supply depot (at wall)
17 – Marine
18 – Command center
After the second Marine is finished, float your Barracks back into
your main base and construct two additional Marines
19 - Refinery x2
21 - Bunker (at wall, where barracks was)
25 - Factory
27 - Orbital command upgrade
28 - Tech lab on barracks (for factory)
30 - Supply depot
31 - Starport
31 - Reactor on barracks (for starport)
6:20 - Scan opponent's main
From here you can react to what your scans and scouts see at your opponent's base.
Fast Expand, No Gas: Banshees and Cloak
Gas First: Engineering Bay at 5:30, Turret in minerals and production area
Cloaked Banshee: Viking, save for scans
Marine / Tank timing attack: Tank / Viking
