It's the roaches. I saw the stream of a guy who claimed he can't be beaten while doing 1 base roach pump nydus backdoor over and over again (his claim was proven wrong, but I guess it's more because he was rather bad and not the strategy itself being wrong). I was also watching Louder's stream for a while, where he was trying to find a viable strategy to roach invasion.
Questions:
- is it possible to get 1-2 immortals before the initial roach force hits you? (~18 roaches from what I saw) From Louder's stream I've learned that 4 cannons + some stalkers and 1-2 zealots do stop that, the question is, can you skip cannons and get immos in time? It leads to another question.
- how do you repel the roach attack delivered by nydus backdoor? Sneaky ovie can see a bit of ground in the back of your base and place this ridiculously fast building nydus there and rape your mineral line
- how much would a zerg have to delay his attack if he were to get some anti-air? In the games I saw that queen can't prevent 1-2 void rays from wrecking havoc in the zerg base (even killing the hatch)