Reverse is FORCING, Phil. Differences between 2♣ and reverse are as following, imho: 1) 2♣ opening forces to 3M or 4m even if responder has nothing. That is, responder has to respond twice withh minimum of 0 hcp. 2) With a one-level opening, responder can pass. Since responder has something to respond, reverse is forcing one more round. That is, if you can respond (minimum of 5 hcp or so) once, you have to bid again if partner reverses. I orginally voted for forcing. Upon reflection, I changed my mind. (It is very rare to stop at 1M, isn't it?). With dead mimimum, 3=4=5=1 (or 3=4=4=2), I would rather to pass. Well, if opps find their play, so be it. They would not pass my 1NT anyway, if my partner doesn't have a strong hand. I would raise to 2M with 4-card or 3 good support, of course.