masonbarge, on 2015-February-20, 20:47, said:
Bridge Doctor: "If your partner opens 2♣, you can warn partner that you have a weak hand by responding 2♦ which shows 0-7 TP. It is an artificial bid and you don't promise any diamonds. You've still got to keep bidding to game but at least your partner won't be expecting anything from you."
Bridge Bums: "3♣ - 8+ points and 5+ clubs."
Bridge 7: "Responder bids 3♣ or 3♦ with 6+ card suit with two of top three honors and at least 8 HCP"
RPbridge: "With 8+ HCP bid a five-card or longer suit (2 H, 2 S, 3 C or 3 D) or 2 NT if balanced"
Wikipedia: "With "natural" responses, which is the most commonly used treatment, the 2♦ bid is artificial and very weak (up to 6 HCP). All other bids are natural and positive."
I have to say, SAYC would call for a stronger suit, so that's 4 in favor of 3♣ and 2 opposed.
I bid 2 NT if pd opens 2
♣ with balanced hands. I would bid 2
♦ over 2
♣ only if 2
♥ was spared for 2nd neg with clubs and more than 6 hcp. Otherwise, if 2
♦ can be 0 hcp, 3
♣ later will often mean 2nd negative, which makes things harder. However, the OP hand is different, if we bid 2
♦ we are not scared to make a false 2nd negative because we will support whichever major pd bids.
Anyway, I totally agree with Richard that starting 3
♣ vs a 2
♣ opener is not going to be in consideration by most of us.
I would open 1
♣ myself with N hand, though I can not really criticize 2
♣ openers.