Intermediate and newcomer players - sharpen your game with this series of tutorials. You can browse the index by topic, or read them in order. Learn even more at ACBL's Learn page.
You are West, on opening lead against 4♥. You naturally choose the ♣K, and that holds the trick, Partner playing the Two. Now, at Trick 2, there is only one card in your hand that will defeat this contract. What is it?