campboy, on 2011-May-20, 12:00, said:
Opener doesn't have to do anything over 5♣. One advantage of opening 2♣ is that you are now in a forcing auction. Opener's bids here should show single-suited hands; if he needs help from partner to decide which strain to play in he can pass, which will get you to the right spot on this hand. I don't believe many pairs can bid a non-forcing 5♦ after 1♥ - 2♥ (5♣) anyway.
I would just love to hear partner bid 5♠ after opener chooses to pass over 5♣. It could be right to play in 5♠, but I don't believe it is likely to be right.