What is Zerling Penetration?
1.Building an insane amount of hatcheries and selecting zergling to spawn from the larva all at once. Thus, maxing out your unit limit. Sending them in for an attack all together would result in a probable zergling penetration. This tactic comes from the everlasting PC game, Starcraft. 2.To rely on the underdog in mass amounts
All of my PWN points came from that zerling penetration through the front of your base, naka.