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I just had the most unnessecarily long league match, it went for 50 minutes for some god forsaken reason. We both had half map control, except he decided he'd go mass battlecruiser. I mean, really? You mass them? A small portion of vikings soon took them down, he had nothing else and still tried to hang on. So most of that 50 minutes was me running around the map killing off his bases.
I kept thinking throughout the whole thing "I should be smarter than this" to end it quicker.
One thing I've learned from watching the Day[9] dailies is that SC2 is largely a game about managing expansions. Both making sure that you can expand and that your opponent can't. Preventing them from expanding altogether is preferred, but anything you can do to harass or destroy their expansions (or main) and disrupt their mining can put you a little farther ahead on economy, and like Lionx said before, you disrupt their plans since they now have to spend more resources trying to deal with the harass or counter your attack so they can safely expand. A guy going for BC's is probably not going to have a huge army to deal with that kind of harass early on. So even little things like dropping marines or blue flame hellions on his mineral line, or cloaked banshees can be tough to deal with. Even better if you can do it in two places at once. Blue flame hellions in particular can be so utterly devastating that a medivac loaded with four of them may kill almost all of his mining SCV's before he an react, but obviously you want to scan/scout to try and see what he has and if he can deal with it.