It feels like ages since I've made a guide or strategy thread here so I've decided to throw one together quickly. This isn't a super detailed guide, but more of a stylistic guideline for people to learn from and hopefully some of you to challenge me on so we can debate the various merits. To start off here's a VoD vs Stats showing a decent execution of the style.
Twitch link for people in Germany: http://www.twitch.tv/x5_pig/v/27995234
The style I show in this game is my standard ZvP, partly inspired by Solar's style shown at Dreamhack.. The compositional progression is Ling-Roach, a wave of 6-12 mutas into 2nd evo chamber and Hive. You can reactively make ravagers whenever you feel threatened and besides 8-12 ravagers can usually just go pure zerglings in your army until you hit ultra-infestor.
Vs certain early attacks you might want more roaches. You always get roach speed just incase.
Your upgrades focus on melee first, then carapace. No range upgrades.
If your spire is scouted early you should go for a faster 2nd evo chamber and infestation to tech to Ultras faster, and commit to a smaller muta count. If you scout them pre-emptively building phenix, don't commit to any mutas.
The mutas don't need to do direct damage, just keep the Protoss pinned back, force cannons/phenix/defensive stalkers and slow them down from progressing to the immortal/disruptor/archon/tempest/storm deathball.
Opening build order guidelines:
3-hatch before pool
4th queen asap
2 lings to scout - use shift + hold position to avoid any adepts coming and block their 3rd base
3:45 safety roach warren
Lair as fast as possible based on scouting. No later than 4:30.
Single evo chamber around the time Lair starts
@3-base saturation drop 4 more gases.
~5:00 Fast 4th base as soon as you can squeeze it in
@Lair - Roach speed, Spire.
@3-base GAS AND MIneral saturation: 10-12 roaches and some zergling production.
Drone 4th base up to 8 drones on minerals + gases when we feel safe to based on scouting.
@100%spire - 6-15 mutas
@50%-100%spire - infestation pit + 2nd evo --> Hive asap. (The faster the infestation, the faster the ultras. You should start this no later than the spire finishing so your ultras hit at a reasonable timing.)
Note: Don't be afraid to keep massing lings. They counter most protoss units, especially when paired with corrosive bile.
Also since the popularity of mass chargelot styles I'm experimenting with just going lurkers rather than mutas as standard. My other reaction is to drop a bane nest and mix in a chunk of slowbanes and some spines to defend the pushes - though this option doesn't seem very strong if you're not in a good spot.
3:30 Scout natural gases whilst sacrificing 2nd overlord into main
Overseer/ovie speed constant scouting once Lair is finished.