Partner easily made 10 tricks which was worth 11%, 11 tricks are there as the clubs are 3-3, so she can throw one loser and ruff them good, only losing two aces.
I have started reading through Partnership Bidding at Bridge, The Contested Auction, and I picked up on something I haven't previously thought too much about. In competition, there are hands you want to pre-emptively raise, hands you want to constructively raise, and hands with a reasonable side suit you want to get across to partner, to allow him/her to judge more easily what to do if the opponents raise the bidding. It also says that some hands do not fit neatly into one category, and sometimes there is some overlap. My hand is one of the latter, it is too weak for a constructive invitational raise, but it is a bit too good for a pre-emptive raise. I chose the pre-emptive raise and it went wrong. I am not sure my diamond suit is good enough for a fit jump (if we were playing that), so my only other option would be 2NT which partner won't need to think hard about raising to 4♠.
AL78 "MPs, vuln against not, 5 card majors."
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East's worry about his singleton king probably made him undervalue his hand. A singleton is still likely to be an asset, however; and an honour is better than a small card. For example, 4♠ is playable opposite
♠ x x x x ♥ Q ♦ Q x x x x ♣ x x x