3 Level Interference over NT

The opponents never leave you alone. Partner and I were playing online and Partner opened 1S. (3C). There you are. Now what.

First if you are a passed hand: Bid what you think is the optimum contract. Remember that no call is forcing after passing so if you want to show your six card suit before offering four card support, don't. You may just get passed in the new suit and there you are. If you are an unpassed hand. A new suit is forcing to game.

If you have no support and less than game going values, pass, wait for pard to X in or lho to raise or something.

Three level free bids force to game or 4m (I believe) i.e. strong actions. If you want to raise the major, do it thus: 4M is still preemptive. 3M is anything from a good constructive raise to a bad limit raise. 4 of the preempt suit is a Major suit raise stating that you would have gone to game without the preempt based on values.

If you look at your hand when pard opens and say "this is a hand that is going to game" (or more) Q bid the 3 level preempt at the four level. This way opener can advance that auction based on the way you made your major suit raise. This was taught to me by Bill Hardy, certainly capable of adequately explaining such standard expert strategies. Use them often! and Have Fun!