Trying to steal my thunder, are ya Tronga? Ryan? Pft, i'll show you kids how it's done, the Renzo-way
Originally posted by icy2050
renzo, how u counterr those? i wanna kick my friends ass, all we ever do is mass
I'll go through each race and say what i think is the best counter for each massing-unit.
PROTOSS
BCs: Scouts/Dragoons/PSI-Storm
Guardians: Corsairs/Scouts/PSI-Storm
Carriers: Scouts/Dragoons/PSI-Storm
Note, you don't have to use PSI-Storm, but it helps, i always like to have at least 6 High Templars around my base at any one time for defense, besides, at 112 damage that works wonders on clumped units, who wouldn't want to use it ^_^
TERRAN
BCs: Goliaths mainly, you could use Wraiths at support, but they cost a bit and can be easily gunned-down by BCs. I wouldn't use Valkyries, only use them vsing Zerg and when you want to harass your opponent. Using BCs as well is fine, but try to always have some Goliath backup, if anything.
Guardians: Wraiths/Valkryies, basically another air unit against it, guardians do some mean damage to ground units so it would be wiser to get air, and i would suggest more Wraiths than Valkryies. If your opponent has anti-air support, then whack some Goliaths in, it never hurts to get Goliaths.
Carriers: Goliaths and Wraiths, definately
way more Goliaths than Wraiths. If you use these two and focus-fire and take down one Carrier at a time, you'll leave your opponent gasping for air!
ZERG
BCs: As TrongaMonga said, throw a darkswarm near the BCs (Preferably get at least 4 Defilers, you might want to darkswarm alot) and move your Hydralisks under it and watch the fireworks. Not much else really works unless you outmass him with Mutalisks/Devourers/Hydralisks, if you do that, you will lose a shiteload of units.
Guardians: Mutalisks, darkswarm + Hydralisks (As said before), Scourges (Two will kill a Guardian), Devourers (Possibly, but don't rely heavily on Devourers).
Carriers; Again, darkswarm + Hydralisks and definately Scourges, possibly a few Mutalisks, but don't waste every penny on Mutalisks.
Bleh, that's about all i can think of, i hope it helps. And note, i am a Protoss player, i suck at the others, but as you can see, i know how to counter =/
Good luck