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Steps:
9 - Overlord
15 - Spawning Pool
16 - Hatchery
15 - Overlord
15- Queen
17 - 2 Zerglings
19 - Extractor
- Metabolic Boost
- Third Queen at Natural
- Overlord Speed
- Lair & Second Gas
7:15~ - Third Base & 3rd/4th Gas
Roach Warren & Evo Chamber ~7:30-8:00
Lair finishes - Hydralisk Den and/or Infestation Pit

Short Description:
This is the build that Leenock used in his games against BabyKnight at the 2013 Winter MLG. This build makes you safe against any Protoss openers with fast Zergling speed to shut down Zealot/Stalker/Mothership Core aggression, a fast third Queen for creep spread, and fast Pneumatized Carapace to make sure you can scout anything the Protoss is doing. The current PvZ meta game is all over the place, so being able to scout whatever the Protoss is doing at pretty much every point of the game is invaluable.

Execution:
Send your first overlord to the Protoss natural in order to scout if they're doing a Forge Fast Expand or a Gateway Expand. What you scout will determine how many Zerglings you make to defend aggression. If the Protoss is doing a gate expand, it increases their aggressive potential exponentially, so you will want a good Speedling count relatively early on in order to shut down that pressure. On the other hand, if the Protoss is doing a Forge Fast Expand, you can get away with only making 4-6 Zerglings and scouting around for proxy Pylons/Tech. Your second overlord's positioning is open for preferential alterations, but you will want it to wind up near his main at around the 6:30-7:30 mark; once overlord speed finishes, send this overlord into his main and see what you can scout. If you scout Robo play, make enough Speedlings to pressure what could be an Immortal Sentry all-in and go for an Infestation Pit for Swarm Hosts when your Lair finishes. If you scout Stargate play, get a Hydralisk Den when your lair finishes and make a Spore crawler at every base, perhaps even making another Queen (up to 4). Continue to scout with your overlord in his main; you should be ducking in and out every minute or so. If you see an unusually fast Robotics Bay, throw down a Spire for Corruptors and move into a Roach/Hydra/Corruptor composition.

Transition:
So, now you're in the midgame. You either have Swarm Hosts or Hydralisks out, having responded to what your fast Overlord Speed scouting has shown you. You should be getting the other tech up (Swarm Host or Hydralisk) and eventually moving into Vipers or Corruptors, followed by Ultras or Brood Lords. Your goal at this point in the game is to prevent the Protoss from getting to their ideal lategame of Skytoss with High Templars. You can do this by going Roach/Hydra/Corruptor and piling on the aggression, eventually going into Brood Lords if you can't finish him off; you can also do this by piling on Hydra/Swarm Host aggression and transitioning into Vipers, eventually getting up a strong economy and Ultralisk army while he's still on ground.