At first glance, the Zerg seem to be one of the hardest classes to play. They are have a very slow start, are late to get anti-air, Zerglings and Roaches get demolished by Terran Players, and they feel weak all around.
However, once you take the time to get down a good Starcraft 2 Zerg strategy, Zerg becomes one of the best races. If you look at the top of the Diamond leagues, it is occupied by more Zerg players than any other race.
The most important Starcraft 2 Zerg strategy you can implement to see an immediate improvement to the way you play Zerg is by using a good build order.
My favorite build order is often called the "IdrA" after being popularized by the professional Starcraft 2 player of the same name. Here is how it works:
1. Go straight for 10 Drones.
2. At 10/10 Drones, build an Overlord.
3. While the Overlord is building, use the extractor cheat to get 11/10 Drones.
4. After the Overlord is finished, build more Drones until you are at 15/18 Drones.
5. Build a Spawning Pool at 15/18 Drones.
6. Build 2 more Drones, taking you to 16/18 supplies (you will lose 1 Drone when creating the Spawning Pool).
7. At a supply count of 16/18, expand to your natural expansion (build a Hatchery).
8. After issuing the command to build a Hatchery, build an Overlord as soon as you have the money.
9. Shortly after ordering the production of an Overlord, your Spawning Pool will finish.
10. Build a Queen and a pair of Zerglings.
Now that you have an expansion, a Queen, and a Spawning Pool, what Starcraft 2 Zerg strategy you use from here depends on your opponent and what they are doing.
2. At 10/10 Drones, build an Overlord.
3. While the Overlord is building, use the extractor cheat to get 11/10 Drones.
4. After the Overlord is finished, build more Drones until you are at 15/18 Drones.
5. Build a Spawning Pool at 15/18 Drones.
6. Build 2 more Drones, taking you to 16/18 supplies (you will lose 1 Drone when creating the Spawning Pool).
7. At a supply count of 16/18, expand to your natural expansion (build a Hatchery).
8. After issuing the command to build a Hatchery, build an Overlord as soon as you have the money.
9. Shortly after ordering the production of an Overlord, your Spawning Pool will finish.
10. Build a Queen and a pair of Zerglings.
Now that you have an expansion, a Queen, and a Spawning Pool, what Starcraft 2 Zerg strategy you use from here depends on your opponent and what they are doing.
Note that you might have to change this build order and get a Spawning Pool sooner if your opponent is doing a fast rush (proxy Gateways or something along those lines). If your opponent is proxying, build a few automated defensive structures and sneak a pair of Zerglings into his main base for an easy win.
Regardless of what you are doing, there are a few strategies you can implement to see immediate improvements in your Zerg game.
Regardless of what you are doing, there are a few strategies you can implement to see immediate improvements in your Zerg game.
Expand Aggressively
The Zerg race has an intensive resource requirement (especially for vespene gas) to be competitive. Since Zerg units tend to be weaker and more expendable, you will need to more resources to compensate.
Also note that the Zerg need significant quantities of vespene gas and often have very high quantities of unspent minerals. Because of this, rapidly expanding and using automated defensive structures is to your benefit.
For a Zerg player, losing a fourth Hatchery and a dozen Drones is not a devastating loss. This can be rebuilt quickly and easily using the Spawn Larva ability and the mineral loss is not a big deal as Zerg players already have too many minerals to begin with.
Expanding aggressively is the most important Starcraft 2 Zerg strategy. You won't win long games without a good economy as a Zerg player.
Control the Map
As a Zerg player, you will only a good economy for yourself, but you will also need a better economy than the opponent. Do whatever you can to stop him from expanding as Zerg depend on this.
One of the easiest ways to do this is to send packs of 12-18 Zerglings with the movement speed upgrade (also known as Speedlings among players) to expansion points around the map.
A dozen Speedlings can quickly take out a group of enemy harvesters and even the Nexus or Hatchery if the player is not quick enough to respond. Speedlings are cheap so it doesn't matter if they die in the attack as long as you inflict some damage on the enemy's economy.
My favorite Starcraft 2 Zerg Strategy is to have two packs of Speedlings ready to go. I send one pack in to kill the enemy's fledgling expansion. Inevitably, bad players will send all of their units to defend this expansion, as if they were anticipating all of my units attacking this expansion.
As soon as the enemy leaves his base or more productive expansion, I will send in my second pack of Speedlings to his main base and quickly take out the main Nexus. I have done this a million times and laugh every single time. Imagine the surprise on the enemy's face when he leaves the front door open as I slide past his army and take out the main base!
Conclusion
By following this simple Starcraft 2 Zerg Strategy, you will be able to dominate your opponents. The key to playing Zerg is building and maintaining a better economy than your opponent. You will not win many games if your opponent is harvesting the same amount of minerals as you.
Other races do not have this problem. Terran players will easily defeat a Zerg player with a similar economy. Do not settle for having the same number of expansions as the other player.
For more great Starcraft 2 Zerg Strategy, I strongly recommend checking out the Star2Pros guide. It has a massive amount of effective Zerg strategies that you can use to beat any opponent: