I am around 4K MMR and I went against a frustrating Protoss player who opens up forge expand into a hidden 3rd. I tried bane busting him with little success and then he turtles up to skytoss. I am quitting this game but I need closure on how to beat this strategy. Here is a replay for reference. Ignore the bm.
You can see my replay at spawning tool. The number at the end of the url is 69724.