[G] ZvZ - 15 Hatch Roach Paradise. [G]

Greetings TL, I am Xana, a midmasters European Zerg. This will be my first guide on TL.
I've struggled a long time in ZvZ, attempting to win in baneling wars. I've tried playing aggressive with a lot of speedlings. I've never been able to make it work reliably, so ZvZ has felt a lot unlike the other MU's. About a year back I saw MrBitter's 12 weeks with the pro's, and found inspiration in Dimaga's ZvZ opening. Its a build I've been working with and tweaking on ever since. Then Spanishiwa's Icefisher build became popular in ZvZ, and I've reached a build I am comfortable with. I bring you a solid way to play 15 hatch, that almost always guarantees you'll be ahead of a 14/14.

10/10 Scouting drone.
10/10 Overlord.
15/18 Hatch.
14-16/18 pool.
16/18 Overlord.
21/28 1 set of lings for scouting +2 Queens.
26/28 Overlord + Spine.
32/36 (5.10minutes) 2 gas, saturate immediately.
32/36 Overlord + 2 additional Queens.
40/44 Roach Warren + Evo.
First 100 gas goes to lair, then I suggest making 4-6 roaches before starting +1.
When you've reached this point your two hatches should have 16 drones mining minerals each, and 6 drones mining gas. This means your total drone count should look like 38-40 drones.
From here on you add a gas at the natural and spam roaches. As soon as the attack upgrade and Roach speed kicks in, you attack. By the time you move out, your minerals will naturally from the builds perspective start rising so you can take the safest third in the world.

14/18 - Pool. You'll need it relatively early as his slowlings can arrive a lot sooner than if he went with gas first.
21/28 - In case he's streaming lings across the map, feel free to produce more lings to do the initial hold.
26/28 - I'll usually skip this spine if my overlord is in a good position to check his natural. If I see drones comming from eggs, I know I'm safe to delay this. - Also check the 5:10 overlord poke under 14/14.
32/36 - Extra queens are unneccesary if drones popped from his first inject. Even if it pops lings, using the money on an earlier evochamber+roach warren will make a wall that is speedling proof. You'll also still want two gasses at around 5:10, but they can be delayed slightly. Delaying will let you have the same amount of roaches and +1 so you can place your third hatch at around 7:30. It will leave you unable to punish a player going for 4 gas however.
40/44 - Roach Warren. The trick to this build is creating a choke where your lings, queens and spines can all participate in the battle. If your placements are off, lings will run past/through your choke and you'll immediately lose. [
A good example of a wall I made in my last game: + Show Spoiler +

42/44 - Overlord.
44/44 - Evo Chamber + Overlord.
50/68 - +1 ranged and all the roaches you have immediate gas for.
If he's taken four gas by now, I go up to four gasses, get my lair immediately and go heavy on the roach aggression while tossing down a Hydra den with any extra gas. I'll also prioritise getting +2 for the roaches. If he's not taken four gas, you can use the 10 roaches to claim your third at 8 mins clean. Propping them between the minerals means he cannot kill the roaches and would have to sacrifice a crapton of Larvae for enough lings to deny the third. - Larvae that you can spend on roaches to just go kill his face. From here, you can work into your own style if you prefer Hydras, Infestors, a fast fourth.. You name it!

The only difference between 14 pool into early expansion and 15 hatch is that he has no immediate way to pressure your front. This means you can delay the pool to 16. After that its again up to you to figure out whats comming out of his eggs.

The keypoint to fighting against a gas first opening is figuring out whats comming out of him. If he mines more than 100 gas, add a second spine and fourth queen. If he's not mining gas, I suggest poking in with an overlord at the time where his first queen's inject larvae eggs will pop. ( Queen pops at 4:10, the larvae inject pops at about 4:50 and the eggs will pop at about 5:10. 5.10 is the time you'll want to have your overlord ready to watch those eggs! )
This will let you make a perfect reaction every single game, provided you see the pop.

The early hatchery will obviously always translate into a larvae advantage. This larvae advantage I translate into a often massive drone advantage. The trick then becomes making a larvae efficient defense, that allows you to keep the drones from all kinds of pressure.
Spinecrawlers and Queens are extremely effective against lings, provided that they are not surrounded. Having extra queens also costs you no larvae what-so-ever, giving room for transfusions to make the defense even more efficient. With mineral walking you can also evacuate your drones through the queens, merely in case that his baneling count surprised you.
Once again we translate the drone advantage into a +1 speed Roach advantage. The +1 Roaches deal with lings extremely well, and nothing else on the map can catch you at this point in time. If the opponent has gone for Mutas, he'll need a spinecrawler wall to hang onto his life - and you'll get to freely deny his third. You'll also have 4 queens to stall for time till your Hydras can come out.
If he's gone Roaches in the same numbers as you've got when you hit his front, the probability of him having the same amount of drones is very low + his third will be delayed. If he's trying to defend with spines and roaches, nothing stops you from droning up your third and just chilling outside his base so he'd be forced to attack down into your concave.

I've been opening with an extractor trick since forever. That is for the simple reason that a 10 drone will reach the opponents base by the time you're on 14 drones on any given two player map. On most 4-player maps you can expect where the overlords would meet, and thus correct your scouting pattern.
This drone is used not only to scout early pool builds, but also to be a nuisance to a player with the same mindset as you. If you're microing correctly, you can delay an opponents 15 hatch by at least 30 seconds. This in turn means your queens will pop earlier, and slowly snowball you in the winning direction. (The Larvae advantage is maintained.) It is very important that you remain aware how much gas your opponent has taken through all stages of the game.

This build quite aggressively skips ling speed. The goal is to by-step ling baneling wars entirely, by setting up a sufficient defense, only to rush for +1 speed roaches. The idea is to hit a timing where you get Roaches out before your opponent could break your defense, and also before your opponent possibly could have any tech out that would harm your roaches. This means you'll be hitting before Infestors pop, before Mutas pop and, in case your opponent went 14 pool, before he can match your drone, expansion AND Roach count.

There is one thing which will force you to start producing banelings, and that is +1 on the speedlings. When the lings get +1 making a reliable defense without banelings costs too much, from my perspective, to be viable. This is the key thing to look for when your opponent keeps mining gas. You want to know where that gas is headed.

Replays will be added as soon as I return home. Till then, I've got a replay of a friend playing this same style, albeit with mistakes:
http://drop.sc/188222