#4 Both Vulnerable
South   West   North   East
   1♥         DBL    2NT     Pass
   4♥         AP                 
                                                North (dummy)
                                                ♠ A 8 3
                                                ♥ J 9 5 2
                                                ♦ Q 10 9 3 2
                                                ♣ 4
                        West (you)                           East
                        ♠ K 10 5 2                               ♠ J 10
                        ♥ 6                                           ♥
                        ♦ A K J                                     ♦ 4
                        ♣ J 9 8 3 2                               ♣
                                                South (declarer)
                                                ♠
                                                ♥
                                                ♦ 5
                                                ♣
 
As West, when East plays the ♦4, showing an odd number of diamonds and denying the ♦Q (in dummy), it looks like dummy is an aggressive defense – get defensive tricks before the dummy’s diamonds are set up. Hearts are trump, declarer can trump clubs so the source of tricks lay in the spade suit. Switch to the ♠2 at trick 2 in an attempt to set up two spade tricks while still holding the ♦K as an entry.
 
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