There are a lot of ways to open up in PvP, each with its strengths and weaknesses. One of the safest and most powerful (on some maps) is the Blink/Observer opening. And boy, oh boy, are there a lot of ways to open with Blink/Observer.
This build MC did in the OSL (I think it was vs Best, could be wrong though), and it really caught my eye. One of the most beautifully put together builds of this type that I’ve seen. This was done on Antiga Shipyard, which is the map it would be the absolute best on, but could work on Cloud Kingdom, and to a lesser degree, Shakuras Plateau. Don’t try it on Daybreak.
Here’s the build:
13 Gateway (scout here, MC didn’t scout IIRC though)
16 Pylon (Chrono Nexus)
18 Cybernetics Core
21 Warpgate (Chrono Boost Warpgate upgrade only now)
26 Stalker, Stalker
32 Pylon (Proxied somewhere near his base)
32 Twilight Council (just as stalkers pop out of your gateways)
34 Warp in 2 Stalkers at your proxy Pylon, this gives you 5.
Push forward immediately and together with your 5 Stalkers. You will have an army advantage at this moment vs almost every build.
37 Robotics Just as Twilight Council is finishing
(you should have 27-28 Probes, and 5 Stalkers at this time)
From here, Chrono Boost your Blink upgrade, and make some more Stalkers.
41 Gateway, Gateway
2x Stalkers, Observer
At 9 Stalkers, make 2 Sentries and a Warp Prism. If he has an expansion, you can use this to Force Field him in or out of his base and utilize your Stalkers to gain a huge advantage or outright win.
If you push into their base with your initial 5 Stalkers, and realize that they went for a 1 Gateway Blink rush, you have very limited time to do your damage. If he’s good, your stalkers will not get away. Make them count, make some Sentries at home, and get an Immortal.
If you are facing a mirror build, be careful about your choices. You can make Immortals and try to expand, but do not sit at home making only Stalkers. If you choose to continue Stalker production, you must be aggressive, and not miss your Macro at all if he has chosen the Immortal/Expansion route.
Don’t be afraid to abandon the build if you sense aggression in the form of 4 gate. You will have an advantage after defending it, even if you had to make several Sentries.
Against a purely aggressive Blink build, you will need to play defensively with Sentries holding your ramp. He will have more stalkers, and will easily kill you if you miss a Force Field and he has read the situation correctly.
Ok, that’s all I can think of for now. EnjoY~~~~!