Diamonds are led with the C♦. You must follow suit and want this trick. Your visible pile shows the J♦, which does not beat the C♦. Your hand holds the K♦ (which beats it) and the 2♦ (which does not).
Which do you play?
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Answer
The K♦, from your hand. Only it beats the C♦; the pile card cannot do this job today. The “spend the pile first” habit only applies when the table can actually win the trick. When your only legal winner lives in hand, reaching for it is the correct play, not a broken habit.