 Responder bids the next suit up with a weak or non-descript hand, and makes any other bid to force for one round.These mean forgoing the artificial 2 opening, so work best in a strong club context.This has the advantage that one can use the same structure for weak 2 openings, a defence to 1NT and (at the 1-level, with a "Double" replacing 2) a defence to a strong 1C opening.