In this Starcraft 2 strategy guide I will be discussing the Terran Reaper rush
. This is one of the best opening rushes for Terran in Starcraft 2.
The fastest way to pull this off is to build a Barracks at 9 population and as soon as you have 75 minerals build your Refinery. When your Barracks is complete attach a tech lab and start building a Reaper as fast as possible.
This Rush is designed catch your opponent off guard and cripple his economy early. It is not a mid game strategy.
Reapers are very effective at killing every tier one unit aside Zerglings with the Metabolic Boost upgrade. Units such as Zealots and regular Zerglings can just be carefully kited and killed. The goal of this rush however is kill your opponents workers. If you can kill several of your opponents workers you will have a clear economic advantage.
There are a few strategies to counter an early Terran Reaper rush.
A single Maurader, Stalker, or Roach in the mineral field will destroy a Reaper very quickly. Several Marines Vs. a single Reaper will also win. A Photon Cannon or Spine Crawler can also easily stop this rush if you aren't careful. Sometimes static defense structures are misplaced so you still may have a chance.
The best thing about Reapers is their ability to jump up and down cliffs to dodge enemy attacks. Use this to your advantage if you are being chased.
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Best of luck to you. I look forward to seeing you on BattleNet!