Defend Against 4♥

You are West, the defender. The contract is 4♥ by North. South is the dummy. Partner leads the ♦K. How should you defend?

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The Entire Deal

Gino's Suggestion and a Short Explanation

Overtake partner's ♦K with the ♦A. Then switch to spades. You are not able to beat the contract, but defending well you can guarantee a winner in spades.

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