#1 Neither Vulnerable
South   West   North   East
Pass      Pass     Pass       1♦
  1♥          1♠          2♥       Pass
Pass       ???

West
♠ 10 9 6 5 4
♥ 7 5 4
♦ K 6 4
♣ A 4
 
West’s 1♠ response shows five+ spades. With four spades and 8+ points, West normally makes a negative double. As West, you should assume that your partner, East, has fewer than three spades given the pass of 2♥. After all, East knows you have five spades! This sounds like a misfit and it is best to defend knowing your side doesn’t have an 8-card fit. Pass is the winning call.
 
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