Keep in mind pvp is always a very volatile matchup and can lose just by simple timing decisions or when you choose to tech. It's always nice to open with atleast the ability to defend a 4gate whilst still being able to maintain a lead depending on what tech you choose.
My standard opener is
9 pylon
12 gate
14 gas
15 pylon
16 cybernetics
17 gas
18gate
19/20 warpgate (drop all chronos)
1 stalker, pylon, sentry then another stalker from second gate.
After that choose whatever tech you like. Just keep in mind that if the 4gate does come the tech will have to be slightly delayed as you constantly crank sentries. It's important to constantly check if it's not a fake as you can over spend on making sentries and in essence get behind in tech!
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