Hi, I'm new to this forum but not this topic. My preferred partner and I play something we call the Sandwich Club which is Blue Team Club with weak NT. We have done a lot of homework, simulations and experimentation with responses to 1C. Shape or control which is better? Answer, both. If partner open 1C=17+ and my RHO passes then getting in the control bid is wonderful. Obviously, RHO stretches to enter the bidding, now you can't afford to lose a round of bidding with control shows. We try to show a bit of both. Our scheme is dble= weak balanced hand with stopper(s) in known suits 4-7 hcps, pass= 0-7 or 3 controls with very good suit or any 4 + controls, cheapest NT= 1H or 1S control response with two 4+ card suits, new suit=1H or 1S control response with decent suit, 3Nt is to play based on a stopper and a single suit too shapely to double. Opener over my LHO interference, doubles with strong NT hand, passes as a takeout bid, bids a new suit. In a suction interference auction double always means that is my suit. He is the kicker, interference over our 1C gives us two bids we didn't have before, pass and double. Since we can fork the pass as weak or strong it does double duty. Most of the time interference actually helps us. I welcome it. It is a myth that 1C systems are too susceptible to interference. It just takes some work. We get a fair share of juicy penalties too that weren't available at the other table.