Posted 2018-June-17, 13:57
First, I'll challenge your initial plan.
4333 hands tend to not take extra tricks in suit contracts. They play rather poorly in fact. So my plan, had RHO never interfered would have been a simple 3NT. Yes, we might miss a major suit fit. But so what? If we do have a major suit fit, it will be a source of tricks in 3NT, often just as many tricks in 3NT as in a heart or spade game.
So a perfectly balanced hand, with nice spot cards as held here will often want to play in a 9 trick game more than a 10 trick game. Just blasting game here makes them guess what to lead too. In fact, many is the time when I find myself in 3NT with a blind auction like 1NT-3NT, yet a fit in some suit, and they lead my suit! So I'll argue the best plan should have been simple. Don't tell the opponents anything about your hand. Just blast. 3NT is a game try. Let them try to set partner, but my bets would all have been on partner making 3NT.
But here, your pesky opponents got in the way. (Got to do something about those opponents. Why do they do this, just when we put up a big sign saying that we probably own the hand?) In fact, their 2NT, suggesting that any suit contract will probably see bad splits, also suggests that your target should not be some potential 4-3 fit, which is just asking for trouble when no ruffs in the short hand are available.
The problem is people want to bid. We have a lot of points, so I need to bid to tell partner what I have. There is one alternative to making a bid, that is, make a call. Double. This suggests the ability to hurt them in at least one of their suits. You can surely do that, in diamonds. Yes, I admit that they might bid 3♣. If partner cannot double them in a club contract, then you will need to guess what to do. But that is later. For now, this hand can announce the good possibility they have bitten off too much, wanting to play in a 9 trick contract.
A good rule that a friend of mine has used for years - "Flat hands defend".