CONTRACT: 3NT South
OPENING LEAD: 5 (4th best under an honor)
Six sure winners: two spades, one heart, two diamonds and one club.
Line of play: establish winners in clubs or hearts.
Trick 1 W: 5, 3, K, A
Which suit should declarer establish first, clubs or hearts ?
Even if the two suits are of equal length, the establishment of the club suit ensures the success of the contract, because declarer has complete control of the suit after after losing to West's king.
Trick 2 S: 5, 6, A, 2
Trick 3 N: Q, 5, 3, K
On any return by West, declarer can now claim his nine winners: four clubs, two diamonds, on heart and two spades.
Declarer makes his contract.
The defense takes four tricks: the club king, the heart king and two diamonds.