Some players have it, some don't. I wonder how many would handle today's contract correctly. After South pushed to five hearts, he ruffed the first spade, drew trumps, ruffed dummy's last spade, took the A-K of clubs, and led another club.
West discarded, and East took the ten and led the queen. South ruffed and led a diamond to dummy's queen, but East won and returned a diamond. South's finesse with the ten lost: down one.
"I could have pitched a diamond on the queen of clubs," South sighed. "East would have to lead from the king of diamonds or concede a ruff-sluff."
South was right, but that play would have looked silly if West had the king of diamonds. Can you make five hearts no matter how the East-West cards lie?
After South draws trumps, he takes the top clubs, leads a trump to dummy, and returns the last spade, throwing his last club. The defender who wins must concede the contract. Suppose West wins. A third spade will yield a ruff-sluff. If West leads a diamond, declarer plays low from dummy and loses only one diamond. If West had a club left and led it, dummy would play the jack, and South would be sure of a third club trick.