My partner opened a "strong" one NT. I am holding:
What should I bid?
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Now that this is open again:
Opposite a strong 1 NT, I bid 3D if it is natural, or I transfer to diamonds if that is available. If partner denies support for diamonds I bid 6D. If he shows support for diamonds I investigate 7D with what-ever methods are available to me. Consider where partner's 16 points are. An "unfortunate" hand from partner would be this: AKJx AQx xx Qxxx, and 6D is looking pretty icy even with all those wasted values in spades. In a practiced partnership I investigate grand slam even if partner denies diamond support initially.
Opposite a weak NT I will probably still end up in 6D, though I might blind the auction by jumping there in an unpracticed partnership. Why help the defence by bidding precisely when it is going to be of more help to the defence?
You have to make a forcing bid, what you specifically bid will depend entirely on what conventions you and your partner are playing with.
Assuming you're playing with a strong 1NT opener (15-17 HCP), that means you and your partner have 32-34 HCP. Since it's 33 points for slam and you've got a void, you know you've got that. That means you have to force the bidding to continue until you get to the 6 level. Whether or not you make it go to 7, and in which specific contract you want to end up, those are things you can use all that bidding room to decide. A typical tool for this purpose is Blackwood/Gerber. With a bid suit preference, I like the additional information gathered with Roman Key Card.
Here's a nice wiki reference to help you pick a Blackwood convention to use.
Just keep in mind that unless you've got that 33 points (pretty rare) there's a good chance you're just bidding yourself into a hole. I've definitely seen players who are way too anxious to try out their Blackwood bidding!
I would test the quality of partner's hand by bidding 2 clubs (Stayman), and hope NOT to hear 2 spades. My worst fear is that partner has wasted honors in spades. If I don't hear 2 spades, partner probably has, at most AQJ in spades. Missing the K (or more) or spades, he might be missing one of the following: A of hearts, A of clubs, or the heart and club Qs. A bid of two hearts raises the possibility of a heart contract, otherwise it would be diamonds.
If partner bids two spades or two hearts, I would show my diamonds with 3 diamonds, forcing partner to bid. Then go into Blackwood to find out how many aces are missing.
If partner had NOT bid spades at any point, I would go into seven diamonds if partner has 3 aces, six diamonds with 2, and pass five diamonds if partner showed one ace. With wasted strength in spades, I would bid only six diamonds if partner has 2-3 aces, and pass five diamonds if he has 1.
Given that we're missing at most 8 high card points, the best case is if partner is missing AKJ of spades, and the worst case is if partner is missing the A of hearts and the A of clubs.