[flametree]

You're dealer at matchpoints, playing with an intermediate player.

♠ A
♥ 7
♦ K.8.3
♣ A.K.Q.T.7.6.5.4

2C is your only ultra-strong opening bid (2D is a weak opening). I'm going to assume that's what we'll start with, but feel free to say if you disagree.

What would you bid next :

2♣ - p - 2♦ - p
3♣ - p - 3♥ - p
??

Partner's response 2D denies more than about 9 HCP. Partner would bid 2H directly with a good 5-card suit and could respond 2NT to show a balanced 8-ish points even with a 5-card major. You did not discuss double negative responses, but at the club most players would use a 3NT rebid to show a negative hand here.

or

2♣ - [2♠] - p - [3♠]
??

You have not discussed what pass or double would mean over interference.

[MrAce]

I am bidding 3 NT in both auctions and i think i will make it.

[Zelandakh]

This hand seems to me to be about the previous bid. Bidding 3♣ only makes sense if we wanted to keep 3NT in the picture. Therefore after 3♥ from Responder the only bid that makes sense to me is 3NT. On the other hand, if we wanted to go beyond 3NT with this hand then we could have bid 4♣ last round. One final option, if we are going to go beyond 3NT, that you did not discuss would have been to open 4NT and just take a chance on there not being a slow diamond loser. If partner would respond 5♣ we can play there, or if 5 of a red suit then 6♣.

[Fluffy]

I wouldnt open 2♣ but if I did I would rebid 3NT, not 3♣. Failing to bid 3NT over 2♦ I bid 3NT now.

[whereagles]

Seems like an easy 3NT.

[Cyberyeti]

I'd probably open 1♣ here (although if my suit was a major, I'd happily open 2♣ then show a solid suit by bidding 3M over 2♦).

Having opened 2♣, 3♣ is fine but I don't see much of a choice other than bidding 3N over 3♥. Partner no doubt has ♦AQ as his only 2 high cards, but you just can't pick that information up safely.