1. Playing as zerg you can build an extractor in your opponent's base. Cancel this extractor before it finishes and rebuild. Continue doing this until they have enough units to severely damage the extractor. Once they do cancel one final time and try to manoeuvre your drone to gain additional information.
2. Playing as zerg you can gain additional supply early on by building two extractors then two drones/zerglings and then cancelling the extractors. This will put you up to two over your maximum supply.
3. To prevent a quick expand place a worker on at the natural of your opponent preventing them from building until they have units to kill it. This is an excellent strategy against zerg players who try to quick expand before getting a spawning pool.
4. If you're playing against a terran player they will often wall in an excellent way to harass a terran player doing this is to use your initial scouting drone to attack the SUV building the wall. If you are playing an inattentive player you may actually kill it stalling and disorienting your opponent.
5. Using an overlord for scouting is a standard however if you pay slightly more attention you can abuse the extra view range on an overlord and once you locate your opponent immediately turn the overlord around to prevent your opponent from seeing it. This is also great if you play random and want to scout but do not want to give away your race early on.
6. Proxy factory/barracks on large maps. On large maps people tend to be less prepared for early attacks and as terran you have the ability to not only use early game proxy factory/barrack to put lots of early pressure on your opponent you can also lift off and fly them back to your base any time.
7. Hide a bunker in your opponent's base. This is a classic move from SC1 but in SC2 there are a few more interesting things you can do. The two that are most effective are reapers that can hop over cliffs this is best in maps that you can jump right up the ledge of your opponent's base and into a bunker avoiding the ramp that is normally blocked off with buildings/units. The second is summoning a mule to repair the bunker because a mule can be summoned anywhere you have vision.
8. Proxy pylon in or near opponent's base. Very effective simply get a pylon in or near your opponent's base and build warp gates as quickly as possible then warp in a few zealots to do early harassment. Proxy pylon tends to work best on larger maps when players are least expecting early pressure.
9. Fast two zerglings. In lower level matches you can easily get into your opponents mineral line and disrupt and possibly get a few kills. In higher level games the two zerglings might not do much damage but it will put your opponent in a defensive mindset often leading them to waste more resources on weak units while you build your economy.
10. The mineral heist. A definite favourite of mine, before you take your worker out of your opponent's base steal some minerals!
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