Let’s dispose of the 3NT contract first, because this one our readers will make in their sleep.  West leads a Club, Declarer holds up until the third round (in case the Clubs are 5-3), and makes her contract when both enemy Aces are in the hand with the short Clubs.  Nine nervous tricks!

Declarer had to rely on a considerable slice of luck to make that 3NT contract.  But in order to make 4♠ (from the North side) you will have to rely on some skill.  East leads a low Club and your job is to make 10 tricks.  Clue: the only problem occurs if trumps are 4-1, so focus on that.

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