I can see the opening Zealot and Stalker from a 4 gate just running past with a probe and wreaking your main. I can't see your first Zealot out before they get to your front door...
there should be a cannon up in time to kill the first units from a 4 gate opener,
but you can just keep your scouting probe alive in their base and spam pylons everywhere while you get ur 4 warp gates up (skip the 2 stalkers and zealot for more money for pylons) then just warp in in his face and you win, or if he is pulling all his workers to kill the pylons you just expand yourself and should be ahead since he isn't mining for ages.
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