EPTI'm gonna assume the map is rush hour since i'm pretty sure its the map this build is intended for. Also this is vs fe only, but you should know that.
The essence of this build is timing, if your mutas or initial lurkers are a bit late, terran can come out when you're weak and rape eveything you have. Hive timing is very important too and comes with only practice, experience and reaction. What's advanced about this build is exactly and only the timing part. Once you have that down the rest comes easy. This build also requires very low multitasking and micro, it's mostly reaction and again, timing.
1. The Build Order
1.12 hatch, 11 pool, drone until 13/14 (13 = 6 lings, 14 = 4 lings) depending on your style, the terran, 10/12 rax or 11/13 rax, 1 rax or 2 rax. I usually go 4 lings, if terran is noob i build 2. The reason you might want to have 6 lings usually however is cuz you're trying to build your first creep colony as late as possible so your eco is as good as it can be.
3rd hatch when you have 300 minerals before lings, transfer drones. This is probably the most important note about this build, GET YOUR EXTRACTOR BY 18 AT THE VERY LASTEST , if you get it at 18, make damn sure to get it as soon as you have 50 min. On maps such as Arcadia with a min only, you can even gas as early as 16. Ovie at 16/17 or even 18 like nal_keke. I do 16 and so does midian so that's why you should probably do 16. Get your colony with your 18th drone if you want to be safe. But I recommend not getting colonies at all if possible. Eco is the most important.
note: the reason why gas timing is so important is cuz you want your mutas to come out as soon as possible, when looking at replays you want your mutas to come out by 7:20, if it comes out after and terran did nothing to slow you down, work on your timing. The reason why muta timing is so important is because you will be expoing earlier than usual, and you want to keep the time window of when terran can come out and kill your expo before lurkers to the minimum. With practice you should be able to expo safely 100% of the time vs equal level opponents.
2. Early Game
Get Lair as soon as you have 100 gas. Terran is either academying before cc or after. For before, you'll need to sunken up depending on when he comes out. Always have a ling in front of t's base, scout, blahblah. The formation of your sunkens is very important on rush hour, there's a thread on teamliquid that has pictures of good rush hour sunken formations. Find it if you're having trouble.
With your next 100 gas, get ling speed. This is very important as lings can contain the terran longer or completely before mutas on rh3. Power drones, power power power POWER power drones, use every larva as soon as it comes out. When your ling speed is almost done, terran is about ready to come out if he went 2 rax academy, it's earlier if he went 1 rax obv. Time it so you start making lings a little before ling speed is done, but this really varies by game, you should know when by feel, don't be mechanical about this. I usually make about a group or so, sometimes more sometimes less, the best amount is the most lings to harass effectively without sacrificing too much eco. If you make too many you won't have enough minerals for an expo and 7-9 mutas initially. If you lost your lings early game you'd need to make more, so don't lose them.
Now with your lings, seprate them into two groups, go to terran's base, one by each path. If terran is coming out already, defend with one group while sunkening, backstab with the other. If terran hasn't come out, contain and harass to keep him busy, just harass the most you can. Usually you need some lings to defend on rh3 to keep your nat gas. At this point, you should already have sent out a drone to the 3rd main, expo when it gets there. This is usually when your spire is spawning. Get your spire as soon as your lair is done, I can't stress enough how important timing is. Usually I get 2nd gas at 24, get it later if you want to expo earlier and/or build more lings. But in return you might not be able to get 9 mutas at the same time.
So at this point, terran either is going back or has never come out. If he doesn't go back, rape his little containing army with muta/ling. Time your ovies right so when your spire is done, you can get as many mutas as soon as possible, preferably 9 of course.
When your mutas are out, harass your ass off without losing any, use the ovie trick. Transfer some drones when the expo is almost up, very important thing is to get your 3rd extractor up as soon as you can, usually with the first drone from that expo. While your drones are transferring, lay down another hatch at the 2500 gas in between you and your 3rd expo. At this point rally all your hatcheries to the 2500 gas as terran will want to attack either that or the 3rd expo.
3. The Switch
This is the most important stage of this build, its also what makes this build brilliant. Lay down a den with your next 100 minerals after mutas are out, lurker when you have 200 gas, make sure you lay down your den as soon as you can after mutas are morphing. At this point you're still harassing with mutas. You should be pumping either drones/lings or nothing at all depending on what build terran is doing. When lurker research is about half way done, pump some hydras according to how much gas you're gonna have. Usually about 7-9 i'd say. Send the first two hydras to the expo and morph them on the way, this is how you get the cool lurker egg line you see in replays. If you really want to be safe, get 2 hydras from your 3rd expo and and morph the lurkers in base. Burrow them above ramp maybe with some lings when they're done. Have the rest at your 2500 gas/4th expo. If terran isn't attacking any time soon, get two lurkers and burrow them at the other path that terran comes out to go directly to your main. That's your "weakside". If terran tries to come out of there later in the game, move your army immediately and try to engage him before he gets to your natural so you don't lose any drones or your extractor. At this point, if the terran is good and went 3 rax fact port, he should be coming out already to attack either your 4th or 3rd expo. React accordingly, build some lings if you have to, but usually don't need to since you're gonna have a lot of lurkers. If you fend off that force, you will be up by a lot.
note: I sometimes do this, but savior adds more mutas after lurker research is done. If your harass is going well and you're not in danger of getting attacked soon, add some more mutas to keep the harass going.
4. Mid-Game
Manage your larvas so you spend ALL of your gas, mostly on lurkers and some scourges. For the people that say "lings are awesome keke", or "theyre the best unit zvt by far !!11!!" They've obv never experienced the pleasure of having 14 lurkers vs 4 tanks. Build lings only when you don't have them, and use lurkers to do the damage. Flanking would be good but when you have so many lurkers, who cares what you do.
A little after your lurker research is done, add an evo and queens nest, I can't give you an exact time frame on this, but time it in reaction to terran and your economy. If your eco is dandy and in no danger, you can hive sooner. If terran is two factory rushing, get it sooner so you can get guards. If for some reason you didn't get your 3rd gas up in time, get it relatively later. But no matter what, you should have hive pretty early in the mid game process, or else you will get run over by a massing (tanks) terran.
If the terran is going 3 rax fact port, which is what most terrans do, and you anticipate he will go 2 ebay or 2 port, i would suggest making the transition to hydra/lurk. Upgrade hydras a little before hive is finished and stop making lings.
After hive is done, lay down a defiler mound, maybe a sunken in your main too. If you're switching to hydra/lurker, lay down another evo and upgrade range, if not, upgrade melee. With hydra/lurk + defiler + a good economy, you're golden no matter what the terran does. React accordingly, position your army intelligently and you should be on your way to a well deserved win.
5. Late Game Tips
Hmm, one of the most important things zergs often neglect is nydrus, get it as soon as your hive is done so you can protect your expos better. However ideally, you should be proctecting your expos with your main army, if you just let terran come out and get to to your 3rd expo, youre in a bad position to battle. Have two lurkers burrowed at each path the terran can come out at. Either have your army sitting at your 4th expo/2500 gas, or hotkey your units constantly and move around so terran doesn't know where you are. I recommend the latter but it really doesn't matter that much. Move your army so you're in a good position to battle always. Good terrans will reinforce their army constantly and will be attacking your main army with his main army so doesn't really matter that much where your troops are when he's not attacking.
Watch out for dropships, place ovies intelligently, scourge. Don't let a dropship catch you offguard.
Late game if you're lazy, slow, or both like me, you can play the tai-chi zerg. Which is turtling with defilers and a bigger army while trying to starve terran out by preventing a 3rd expo. Hydra/lurker/defiler is not hard to micro. Swarm, plague, plague the vessels. Plague is awesome. Plague his scvs for extra embarassment if you can. If you have 4 gases for a long time there's no reason why you should lose. But then again there are sooooooooooo many variants in zvt that it's hard to give set instructions past early midgame. So just react accordingly, don't fuck up your micro, keep good scouting, and you should be doing good. Good Luck!
PS: If you would like to see replays, or have any questions feel free to msg me on west and I will try to help out the best I can.
http://www.sendspace.com/file/1czhx2
small rep pack with some old games
TvZ general concept
For terrans, you can either go for a micro timing build or macro timing build. Micro timing would be less units + constant pressure + come out sooner. 3 rax fact port is micro timing, You come out when zerg is weak, right when they're morphing their initial lurkers and use your micro and constant reinforcing to go pound for pound to push zerg back enough so you can do eco damage. Macro timing build would be a two fact rush. You come out before hive tech kicks in and go for the zerg main. Both builds require excellent timing and micro. But if you're the better player you should be able to kill zerg.
The best foreign macro timing, two factory terran is Daze, and the best micro timing terran is probably Idra or Sarens. So if you want to learn the two different ways to tvz watch their replays.
Side note: Unless you're 90% sure you can kill the expo hatch before lurkers, don't come out cuz most of the time you'll just waste those marines and die to muta/ling, muta/ling/sunkens, incoming lurkers, etc.
