What's a good opening for lopsided games?

What's a good opening to use when your playing someone, say 600 points better than you. And I don't want to play for draw either.

There is a notion that playing some obscure, wild, tricky gambit line against strong opposition is a good way to go. Another notion is to play something very solid and bland, hoping to last as long as possible.

The odds of winning against opposition 600 points stronger than you are are low (estimated at 3%), so what is the best strategy?

In my view, the best strategy is by playing the opening from which you will arrive at middle games for which you best understand the plans and strategies.

Always play what you know best.

(My presumption here is that you are a relatively novice player. But this recommendation would hold for almost any ratings group.)

thats exactly what I was going to say.. 100% agreed.

play your best, with your best opening and learn from it. if youre just starting out and dont know anything "best" the learn symmetrical open games first

Hmmm, I agree with the idea of the PW.

Look for obscure (not bad) openings, learn them really well.

There must be value in positions which you have played a dozen times, and your opponent has never seen.

Remember, 600 point should statistically be a virtually insurmountable obstacle,and you will almost certainly lose whatever strategy you employ, but this guy has a greater chance of making a mistake in a position he has never seen.

Postwriter wants to beat the occasional 1600. They (myself included) fall for cheapos, trust me.

On another way, if you are playing up that far.  Play a line you have a hard time beating and watch how your opponent takes it apart.  Free lesson.  If beating the French defense is difficult for you, play e6 against the Expert.  You can learn a lot that will help you later.