The French. It's never let me down in a big game.
What Is Your "Go To" Opening?
I don't really vary my openings enough for this to apply to me, although I'm about to add the dragon to my repetoire in which case the najdorf will be my fallback.

Giuoco Piano in almost every game, I'd love to find a new one to change it up but I'm just so damned comfortable with this one....
1.e4 with white - against 1...e5, the Scotch is my old faithful. Against the Sicilian I'll play the Yugoslav/English attack almost regardless of what they do, if I need a "go to" situation - against many Sicilians this is what I'd play anyway though.
With black, against e4 I go back to ...e5 (Nf3 Nc6) when my openings are failing me, and against 1.d4 I'll trot out the full Slav or the Benko.
In another forum we discussed your problem opening, the one that gives you grief. In this forum let's discuss "Old Reliable," the opening you go to when you are really feeling the pressure.
It may be a tournament game or against a family or friend that you despise losing to, or it may be a live chess or online chess game against a fellow Chess.com member. There always comes a time when you feel those butterflies
and revert back to what is safe and comfortable, like a delicious macaroni-and-
cheese dinner after a bad day at work.
I always open with e4 under pressure, and invariably revert to the Italian Game or the Giuoco Piano, which I won my Junior High Championship 30 years ago with (hard to believe, as bad as I am now, but I quit for 30 years as well). Now I am learning the Ruy Lopez, but under pressure it's back to Old School.
With black I always play e5 after e4, and frankly I dread d4 openings
period because we never seemed to play them back then.
What are your favorites?