Dealing, and with only us vulnerable at matchpoints, and holding ♠ 84 ♡AK5 ♢AKQT96 ♣ A6,
I opened a timid one diamond, planning to bid 3NT if partner bid one spade or 1NT.
Partner passed with six high card points (and a 4-3-3-3 distribution), instead of bidding 1NT. His three relevant cards were ♠ QJ9. The rest of his hand could have been all "twos" and we would still have made 4NT. We were left in one diamond, made four, and got a bottom because others bid and made 3NT.
Can I open 2NT with such an unbalanced hand? Or was it incumbent on partner to bid 1NT which I would have raised to 3NT?