Zerg vs. Terran (StarCraft II)

Early Game
Common Strategies

15 hatch into 14 pool
In this opening you get a second hatchery before you get your pool, so you get a strong economy, but you have to fear a bunker-rush (which should be defendet with about 4 drones). If you save your base, you can counter an helion- or banshi-opening with queens.

14 pool(/11pool) without 15 hatch
If you expect a huge push by the Terran in the early game (like the artifical inteligence on very hard do), you can play a 14 pool without a following 15 hatch, so if you get an extractor with your pool, you will get enough speedlings and banelings to hold you base. In this openig your second base is delayed.

If you see that the terran has no bunker behind his wall, you can use you banelings to destroy one supply depot and the speedlings to destoy the terrans armee. This works only with very bad players, becous many terrans build two supply depos in a row or let other buildings fluy behind the wall to defend this baneling-bush.

Rare Strategies

6 or 10 pool
The zergling rush openings would only work, if the terran does not wall his base.