Firstly, if i may - a word on your partnerships. A theoretically superior system will make very little difference to your results. Before you see this benefit, you will have many losses - bidding misunderstandings, errors in both bidding and play due to concentrating on remembering the system, and the time spent on system that could have been spent reading a book on play or bidding judgement. Having said that, if learning a new system is something that both of the partnership enjoy, then go for it. Just don't pressurise anyone into doing anything they aren't keen on. And I mean keen, not just 'accepting', I speak from bitter experience! Now, a suggested answer to your question: Jacoby 2-step. It isn't intended particularly for using with limited opening bids, but my guess is that it would work quite nicely, in fact I may give it a go in the near future. 3C = min, no good second suit, no void. 3D = any strength, good second suit or void. 3oM/4C/4D = max, singleton 3M = max, no shortage 3N = max 5332 After 3C, a lot of responding hands will sign-off in 4S. Otherwise 3D asks more, and opener bids 3H->4D as he would have done on the previous turn with a max. After 3D, 3H asks for more info: 3S shows a void, 3N asks where (if hearts are trumps, 4H then shows a spade void). 3N shows a max 5422, 4C asks for the good 2nd suit. 4C/D are natural, 5-5s, and 4H shows spades as the second suit. Hope that is helpful, good luck!