I'm having a really hard time with this. I'll refrain from calling the Colossus OP but how can you defend from two-four colossus surrounded by stalkers next to a cliff by your base? The Colossus are just out of range of anything that can attack on the cliff. If you send ground units out they get murdered because of the colossus/stalker combo. If you go just air then you get pwnt by the stalkers surrounding the colossus. A mix of air and ground doesn't seem to work either. I've had this happen to me two out of the last four toss matches. They just sit out there with their colossus/stalker clump and pick off everything I send at them.
Have you tried neural parasite? Or corruptors without forgetting to use their ability? These work rather well against colossi and stalkers are eaten by zerglings. But bear in mind that good counters fail as well if not up to par in numbers - macro like mad, spread creep, harass, whatever it takes to speed you up or slow the opponent down.
This usually happens within 15 minutes of the game. I can't tech quick enough to get corrupters. I'll have to try infestors.
Simple Mutaling. You should be able to get mutas and lings around the 9 minute mark in great amounts. Mutas will beat stalkers in same numbers. Nparasite is kinda crappy now but that is pretty much your choices. also around 15 minute mark its not impossible to have broodlords and broodlords pretty much own protoss ground long as you have a ridge or can stay out of range the the blink stalkers. Simply put, grab your natural early. Defend if they do a strong push, scout what their tech is and, well pretty much go air anyway. lol. At that point you should have map control and a better econ. Just watch out for psistorm.
I wuda said brood lord, as I can tech really fast, but w.e ya, i second mutaling. Also i wud add in hydras, if only to distract and snipe.
Depend what you are going man. You said 15 minutes, and that means you should have been scouting. If the guy is massing cols and stalkers what would you usually go? Hydras/Infestor or Muta/Ling? Hydra infestor would work very well, as it works well against freaking everything. -.- Muta ling should work as well, but you would need to send them in pretty much all at once with mutas lagging behind a bit so they don't take all the fire. When the cols go down and the lings start running low, retreat, mass more lings/mutas and push again. Like someone earlier said, macro is zerg, gotta macro like hell and no way the toss will outproduce you unless he's steps above you. If you can get mutas out though...corruptors should be well within your ability.
Yesterday I took down several Colossi with Muta/Ling. The lings seemed to tear through them pretty quickly despite the splash damage they took.
This statement makes no sense to me. You should be able to have corrupters with energy long before you have infestors with both the neural parasite upgrade and enough energy to use it.
That really depends how you tech. If you go from lair to infestation pit, then straight to neural parasite it takes 160 build time (50 Pit+ 110Parasite). Lair to spire takes 100 build time. So yes corruptors are faster but I think infestors may be a possible alternative.
No, it doesn't depend, because his assertion was that he cannot tech quickly enough for corrupters, but he can for infestors (to deal specifically with collusi). That's simply untrue.
Well I know it was probably said, but macro up your units and throw in 3-6 corrupters(3 if its 1 colossus, 6 if its more than 1) RIGHT when you see any colossus being made and he has a big army. But basically what you'll be doing is massing roaches and hydras against the stalkers and then let your corrupters and a few hydra do the work on the colossi. I know hydras get owned by colossi, but I saw Idra do the exact same thing I just said against the same exact thing you said and he owned him.
If they have no sentries, it's actually quite easy to get a good surround on a Stalker + Colossus. Just don't be antsy pantsy and run straight into it. Be patient and wait for a good time to strike and surround. It's completely possible to destroy stalker + colossus with Roach Hydra. If they have Sentries, thats when you have to be a bit more careful. Those Force Fields can make a smaller Protoss army win. However, pretty much what a lot of people said here are viable choices. Muta ling can work, roach hydra can work, infestors can work. Use what you think you're best at.
you have to flank with ultralisk and use them as tanks while hydras could help killing them Ultralisk-Hydra will completely Pwn Stalker-Colossus ^^ but it could be difficult when theres cliffs involved cause then the colossus could just walk up on the other side of the cliff and the stalkers could blink up there aswell.... in that case you should probably get some ultralisks up there aswell to make sure he cant retreat up there :3