Zerg Strategy: Classic

Here's arguably BroodWar's most famous and most used Zerg strategy: the 12 hatch. It is best used against terrans, zerg and maybe in multiplayer. For terran, you can choose to block the base entrance with a hatchery and 1 creep colony. Behind the blockade, put 6 sunken or 4 sunken 2 spore. Still, the best will be putting 4 sunkens and 3 spores...well, you get the idea. After building the 9th drone, take 1 drone to scout and build 1 overlord. Once overlord is complete, build drones until you get 12 for control. At the 12th drone(not including the scout, which makes 13), go to your natural expansion to build a hatchery. Fast expansion is the key to early(small) victory. After your hatchery is half complete, build 1 overlord( you should have 18 drones) and start the blockage by putting another hatchery at your choke point. Then, build a spawning pool near your first hatchery, and 3 creep colonies clustered together near the spawning pool.(note that this isnt part of the blockage). Now you have 2 options: make more drones and an extractor, or continue making drones for your natural expansion. I will recommend the extractor though. After extractor is done, take 4 drones to harvest gas. Now you have another 3 options: go for hydra den, zerg lair or more zerglings. Zerglings are key to early economic harrassment, hydralisks are key to pwnzing enemy units and the lair unlocks a new tech tree. I would reccomend making the lair AND the hydra simultaneously. Don't bother for zerglings, because if the enemy happens to be faster than you, all your zerglings are useless! So build a spire once your lair is complete and a group of 12 hydralisks and 11 mutalisks. Group the mutas and 1 overlord together. The mutas will cluster when grouped with the overlord(or some people call it stacking). Take these 2 groups and harass the enemy's expansion (if any). If there is no resistance, harass his economy while building queen nest and additional hatchery at 3rd expansion. Also, after his economy is somewhat down, kill the thing that will be the most threat to you,(e.g, kill barracks coz it can produce marines, or armoury, so he cant produce goliaths, then kill his factory, so that provides an almost instant victory as no one is here to harass your hydras and marines will get pounded from the skies by mutas. Once your queens nest is complete, upgrade into hive and make defiler nest. If the enemy is putting up a fight, feel free to reinforce and fall back, or send defillers to dark swarm. Dark swarm almost makes your units in the cloud INVINCIBLE. Almost. The only thing that can harm you throught the darkswarm is Firebats, which will be no match for your mutalisk massed or hydralisks.