You are South, defending 4H. Partner leads a spade, dummy plays the SQ:
1. Should you win with the ace or king? Why?
2. Which suit(s) in the dummy should you label as your side to play?
3. Which suit(s) in the dummy should you label as your side to avoid playing?
4. What should you lead next? Why?
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The SAK held in your hand are of course equivalent. It's a matter of signaling to partner. You should win with the SK. Third-hand plays the lowest of touching honors. In partner's point of view, if you win this trick with the SA, declarer may hold the SK. BUT, if you win this trick with the SK, declarer cannot hold the SA.
Our side's suits to play: Spades and diamonds
Our side's suits to avoid playing: Hearts and Clubs
Play a diamond. You hope that partner holds the DA and will play a spade back. Then you can finesse against the remaining SJ in the dummy. Your side's defensive winners: 3 spades and 1 diamond. Note that you must avoid cashing your 2nd spade winner, as you'll lose the finesse opportunity.