something I do is get a 2nd rax as I push out and put down an ebay just as it finishes, put 1 turret in my mineral line for proxy oracles and build some in his natural. once I have 3 mines I put down a tech lab to build tanks and go for the hard contain.
I'm supprised there haven't been more people making tutorials about proxy mine builds because every one I see is different.
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