So... what are they good for? Zerglings' main purpose switches from core army in early game, to scouts and runbys late game.
Are Surprisingly Good At:
- Counterattacks: Even 12 Zerglings into someone's unguarded expansion might cause their main army to turn around to defend. While 12 Zerglings shouldn't turn the tide of the battle for you, if they kill 12 enemy workers, the next battle will be far easier.
- Killing Roaches and Stalkers, early game.
- Get Burrow. Burrow Zerglings all over the map, preferably under enemy expansion locations and where you DON'T have creep, but need vision.
- Put a Zergling outside the enemy base. If he moves out, you'll know it. All it costs you is 25 minerals, and is easily and quickly replaced.
- Although it may LOOK like you have a lot of Zerglings, they are so cheap that numbers are often deceiving.
- Do not send Zerglings against walls, into AOE, or through chokes. Do not send them against large masses of marines, except as a means of preventing them from kiting your banelings
- Keep Zerglings away from enemy banelings. You are almost better not engaging at all than engaging enemy forces anywhere near banelings. If you must, send 1 zergling at a time into banelings to reduce their numbers 1 for 1. It is possible to kill over 16 Zerglings with 1 Baneling.