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SPECIAL PRTs
AR - Basically 3 different styles of play, and only one of them I've ever seen or read as effective. Extremely vulnerable, and a bit outside the scope of this.

Not sure what the three styles of play are. There's normal, there's the half-baked tri-immune, what else?

The thing about AR is that they're factoryless (and thus punch above their total resources) and that there's very little they have that cannot be moved (the mineral fountain is basically it). They aren't top-tier, though, unless it's a multi-winner game.