for the person that mentioned PVP 1v1. I think if you are scared of zealot rush, then go forge first then gateway. that should hold a non stop zealot wave.
Dear god, do not do this. If I ever scouted my opponent going Forge first in PvP, I would just think auto-win, especially if I see him throw cannons up in his main (as opposed to trying an offensive cannon cheese). The reason is that once a competant player scouts a forge first, they will forgo their Zealot rush and either a) focus completely on tech without building units, or b) expand. Since cannons provide no offensive threat, you don't have to build any military units until they throw up 2-3 Gateways.
Personally, I haven't had trouble fending off a 2-gate Zealot push while going Cyber Core. If I scout a 2-gate and I'm doing a Cyber Core build, I do the following:
-Build a Zealot when the Cybernetics Core is halfway finished. The Zealot should finish at the same time as the Core. You can adjust it accordingly using Chronoboost if needed.
-Build a 2nd Gateway once your first Stalker is in production. Make sure to permanently Chronoboost this Gateway and build nothing but Stalkers from it.
-DO NOT BUILD THE SECOND ASSIMILATOR UNTIL AFTER YOU'VE DEFENDED. You don't need that much gas when you're fending off this rush, and it's imperative to have as many Probes on minerals as possible.
-From here on, it's up to your micro skills with the Stalkers to fend off the attack. Stalkers have very fast movement speed, so you must run the Stalker away from any Zealots attacking it. The goal here is to stall until more Stalkers come out, since 4 Stalkers can take on 8 Zealots if you micro and kite them.
-If your opponent is good, he will target your Probes with 1 or 2 Zealots. You have to respond accordingly by microing those individual Probes away.
The ultimate goal with fending off this attack is building up a squad of Stalkers. With micro, Stalkers are much much better than Zealots (before Charge gets researched). Once you have your Stalker squad and have fended off the first attack, you force your opponent to be on the defensive. From here, you can expand to gain an economic advantage or tech. Either way, you've secured yourself an advantage for the midgame.