The Strategy

Now let me introduce two strategies to you. The first one is called a "4 Drone Rush". Use the first 4 drones for extracting minerals. As soon as you have 200 minerals, make a Spawning Pool.

Then make one more drone. As soon as the Spawning Pool is made, make 6 zerglings and defeat the opponent. The problem of this strategy is that it's all-in type; if you fail, you may suffer a big damage.

The second is called "3 Hatchery" Strategy. Make three hatcheries after getting some minerals with your drones. Then build a Spawning Pool and a Hydradisk den. Then you can get many units from those 3 hatcheries, and can defeat your opponent easily. But you may have not be able to defend at the outset due to lack of attack units.