Hey, i've been having trouble with this mirror matchup. For the past week or two i've been doing a 1rax FE with varying degrees of success. It's usually much more successful vs. Terrans who like to do aggressive marine/tank pushes (for some reason) but i've had much issues with terrans that are less aggressive and more defensive.
For example on a map like delta quadrant, i scouted my opponent teching early so rather than FE i delayed it a bit to drop down an additional 2 more rax and made my push ~6 min mark to be hammered by a siegetank shell. I macro up to 5 rax and tech up to starport on my 2 base. Sometime during that i scout him and find his expo (the nat next to his base with the destructible debris). By then he's got about 7 siege tanks guarding his choke and a decently sized bio ball.
I ended up losing that game and was really stumped that i can't figure out this MU i'm usually on the defensive and it works out well that way but if it's vs. another defensive terran who turtles up and uses tank drops to shell my expansions i find myself lost as to how i can beat them.
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