just recently i saw a replay with NEXSickness (I think was the name) where he went 3gate robo WITH a warp prism after scouting the 111, he also poked with the starting units, sniping off marines. But he's like masters/GM. so it's not accurute, but warp prism play seems like it may really slow down the terran, forcing them to stay in their base if you can do it.
But as i said it's high level play and fairly micro intensive, so it's tough to say it'd work in lower leagues though.
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