I've only been watching bigger tournaments in the last 3 years and I'd like to pick the brains of community members who are following daily streams and other tournaments more closely.
It seems like ZvT has changed a lot in the past 3-4 months and recently Zergs are doing quite well even, after struggling for years. Here are my questions
1) Why did 5 Rax +1 quit completely dominating the matchup?
I'm aware that Flash mentionned that he was feeling like zergs were adapting to the build and that is part of the reason he developped 1-1-1 in the last year (that and 1-1-1 being easier on the hands is the extend of my knowledge). Even now that 1-1-1 seems to have fallen out of fashion, players going 5 rax +1 don't seem to be having as much success with it as they used to. My question is: What exactly was the adaptation that zerg players brought to the table against the build? I notice that when Terrans go out on the map to hunt the third they get crunched by mutaling quite often nowadays. Did zergs find some build order refinements that beat that timing? What happened exactly?
2) Why did Terrans abruptly stop to mech switch
Mech switch dominated the matchup for a good 5 years span (if not more) is my impression but it seems like in between 2 ASLs every Terran went back to doing SK terran (with BCs). What brought about such a sudden change? I figure this has to do with terrans not being able to dominate the midgame as much as they used to with 5 rax +1 so maybe the answer to the first question answers this one too.
3) What's up with the BCs
I don't really get the BC strat. I feel like the BCs are rarely very cost efficient, especially when considering you could be making vessels instead. I get that BCs don't require much APM to work with compared to vessels but can someone explain to me the strong case for building BCs?
Thank you everyone.