“Build the wall!”

Donald J. Trump
Trump
ling

Ling Tight

This wall is impassable for Zerglings/Marines/Zealots/Drones

zealot

Zealot Tight

This wall is impassable for Zealots/Probes

overlord

Overlord Trick

Use the Overlord trick (select larvae together with an Overlord, press stop, wait for larvae to go left, and hatch a unit) to make this wall even better

dragon

Dragon Tight

Dragons can't get through this wall, we recommend destroying the blocking pylon or gateway later in the game

hydra

Anti Hydra Bust

A good wall to hold Hydra Busts, could be worse for blocking Zerglings

simcity

Simcity

Use your micro and simcity to fend off the Zealots! The gap between barracks and supply is passable for Marines but not for Zealots

gas

Gas Trick

Building a gas extractor makes the gap passable

warning

Warning!

This might be the best possible wall, but it's weak and requires caution

cannon

About cannon placement


Korean progamers build cannons differently based on the position they are spawned. Some of the positions don't allow for many cannons to be placed, while it's crucial when defending against the 3 hatch hydra build.

Building them up against a wall makes them easier to be sniped by range less hydras, but building them one hex off is harder for building many cannons and making the way passable by units. Putting them one back also helps against small numbers of zerglings. If they get past and try to run up the ramp, they can sometimes cover more area. However, if it is a large number of lings, they are easier to surround.