Dummy
♠ K75
♥ AK53
♦ Q6
♣ A874
Declarer
♠ AQJ10864
♥ --
♦ A2
♣ K652
You're declarer in a contract of some number of spades, it doesn't really matter how many. The ♦7 is led; Q, K, A. Do you see how to take all 13 tricks?
Draw trumps in two rounds ending in dummy, play A and K of hearts pitching clubs, then K and A of clubs and a club ruff to set up dummy's last club for a diamond discard. Dummy's third trump will be the entry.
Yes it's simple but a lot of players will miss this. I can't tell you how many because clubs split 4-1.
