This BO is fairly simple, you just have to make sure you build your supply depots and barrack at the ramp to your base, so if your rush fails, you still have a wall. Well here is to BO:
9 – Barracks
(build a tech lab as soon as possible!)
9 – Refinery
(put 3 SCVs on the refinery as soon as it finishes)
10 – Supply Depot
Now, you may want to research the nitro pack upgrade for your reapers, it is minerals well spent!
