Preserve your assets

               ♠ 8 5 4
               ♥ A 9 6 5
               ♦ J 9 7
               ♣ A 10 9
♠ K 9                        ♠ 6 3
♥ K J 10 8 4 3 2             ♥ ---
♦ 2                          ♦ A Q 10 8 5 3
♣ Q 7 3                      ♣ K J 8 6 2
               ♠ A Q J 10 7 2
               ♥ Q 7
               ♦ K 6 4
               ♣ 5 4

South opened 1♠, West overcalled 2♥, North competed to 2♠, and East was stuck for a bid. They played that a double was a good raise to 3♥, so a responsive double was not available.

This passed out and West led the ♦2. East won the ace and returned the suit. South did well to duck, West ruffing. The ♥K was returned to the ace, and East ruffed. A second diamond ruff was followed by a second heart ruff. Declarer was booked before gaining the lead, and he still had a club to lose.

Do you see how South could do better?

At trick three, West led the ♥K. If declarer ducks, East can do no better than discard. East will ruff the next heart and give West a second diamond ruff, but the contract will be safe. Declarer can win the next trick, draw the last trump, cross to dummy with the ♣A (or the ♠8), and discard the club loser on the preserved ♥A.