With no one vulnerable, partner opened 1 diamond after one pass. I bid one heart with the following:
♠ J985 ♡ AT852 ♢95 ♣ A9. Partner rebid 2 clubs. I tried 2NT, thinking that partner had the minor suits covered and I had the majors. We went down four, and I was surprised so see that partner had bid with ♠ A6 ♡ Q ♢KT763 ♣ J7532. I wouldn't open with such a weak hand, but if I had, I would "sign off" at 1NT (non-forcing).
I had considered partner's sequence "somewhat strong," and put him on a minimum of something like ♠ A6 ♡ 2 ♢KQ763 ♣ QJ753. We would still have gone down one or two, but that would be better than down four.
A number of people in our club open "light" with 5-5 and 10 high card points even in first and second position. (And I didn't feel that partner had a full "10" because of the "stranded" Q of hearts and the doubleton spade ace, both outside his main suits.) Is this peculiar to our club or are players "generally" opening this way? And if they do, would it have been better for me to bid two diamonds rather than 2NT on my second turn?