Build Order
9 Overlord
12 Extractor
11 Spawning Pool
15 Lair
16 Zergling
18 Hatchery
17 Overlord
18 Overseer upon Lair completion
Continuation against 4 gate 1 gas:
CONTAMINATE WARP GATE RESEARCH
20 Queen
21 Metabolic boost research + pull gas drones
Place 2-3 spines crawlers at your natural ASAP and pump out zerglings
Continuation against 3 gate sentry expand or 4 gate 2 gas
Save contaminate for later tech structures
20 Burrow or Queen
21 Roach Warren
Spines at natural if it's 4 gate
Timings
~4:40: Overseer morph complete
5:16: Contaminate is ready
5:27: Hatchery at natural complete
6:11: Burrow complete
Why it Works
As long as you're careful keeping your overseer alive, Protoss cannot catch you off guard with any build.
-4 gate: Though your survival window is kind of narrow, contaminate will delay the earliest possible warp gate research (besides korean 4 gate), essentially delaying the push by 30 seconds
-3 gate senty expand: If your opponent expos after 6:11, you can block it with a burrowed zergling. I've had no problems keeping up economically and burrowed roaches will hold any later push
-5-6 gate: Easy to prepare for if your overseer does not see any tech structures
-Fast stargate: You can contaminate the first unit being trained, then immediately start making spores and 2 more queens. There's no chance this will hurt you.
I found that it's best to follow up this build with a ~12 minute push that takes advantage of your early tech, such as roach/infestor or muta/ling.
What Can Stop It
The counters listed below can hurt pretty bad, but I'm not sure if they're insta-lose.
-Early stalker harass: Haven't encountered it much. You need to make more zerglings and perhaps a spine crawler, which could set you back.
-2 gate zealots: You would have to cancel your natural hatch and go one base.
-Forge fast expand: Kind of iffy. You may need to rely on a 2 base all-in, but it's still possible to last into the late game.
Conclusion
This build will probably only work at lower levels. But still, it's worked 9/10 times against diamond and masters players. It kind of relies on the build not being popular at the moment, so only those that think on their feet know how to counter the build. So all I have to say is to use it until it's figured out . Let me know what you think.
Replays
https://www.yousendit.com/dl?phi_action=app/orchestrateDownload&rurl=https%3A%2F%2Fwww.yousendit.com%2Ftransfer.php%3Faction%3Dbatch_download%26batch_id%3DMEtRWGJOWkJFc0pFQlE9PQ