I cannot remember a session where I opened a strong NT twice and ended up defending both times. This was against a pair of improvers who struggled with this hand but stumbled into a contract which gave them a top when it went one off, as opposed to the other two pairs who played in 5♦X off one or two.
During the defence I had a moment of thinking too much. Partner led a club, I saw the king come down under my ace and I switched to a trump won by declarer. Declarer led a top diamond which I won (after some thought) and partner played the four. As the four is the lowest unseen card I thought partner had a singleton, but at the same time wondered why she hadn't led it. I eventually decided to play partner for a singleton which didn't work although I don't think it ultimately cost.
How would you bid the EW cards after a 1NT opening by North?