the 2♣response may well be artificial, it is the cheapest 2/1 call, with the responder knowing the hand is playing in ♥ looking for more information about the opener's hand while telling nothing useful to the defense. all this talk about a double fit is sayc folly. the 2♣ call usually has a ♣suit attached to it but some game going hands with slam interest could bid 2♣/1♥ with fewer than 4 ♣. bid slowly to show strength is the 2/1 mantra, for example 1♥/2♣/2nt is a stronger opening hand than 1/♥/2♣/3nt