As Terran
Make:
Widow Mine
Siege Tank
MarauderMines and slow effects punish Zealots before they surround.
Open in the counter tool with Zealot tagged ->As Protoss
Make:
Archon
Immortal
SentryForce fields and Archons stop Zealots from making full contact.
Open in the counter tool with Zealot tagged ->As Zerg
Make:
Roach
Baneling
LurkerBanes punish clumps; Roaches hold the line.
Open in the counter tool with Zealot tagged ->
Adept
Stalker
Observer
Warp Prism
Colossus
Disruptor
High Templar