#9 East West Vulnerable
West     North     East     South
   1♣           1♠         Pass        3♥
 Pass        4♥          AP
                       
                                                North (dummy)
                                                ♠ A K Q J 4
                                                ♥ J 8 6 2
                                                ♦ 7  3 
                                                ♣ 10 2
                        West (you)                             East
                        ♠ 6 3 2                                       ♠
                        ♥ 9 4                                         ♥
                        ♦ A K 7                                     ♦ 9 
                        ♣ A Q 6 4 2                             ♣
                                                South (declarer)
                                                ♠
                                                ♥
                                                ♦ 10
                                                ♣
 
As West, when partner plays the ♦9 (Standard Attitude) showing a doubleton or the ♦Q, it may be important to know which one it is. Ask this question, if partner has a doubleton, how many diamonds does that give declarer and is the answer consistent with the bidding? In this case, if partner has a doubleton, then South has 6 diamonds which is not what the bidding tells us. Knowing partner has the ♦Q, lead a low diamond at trick 2! East should win the ♦Q and switch to the ♣9. Two diamonds, two clubs for down 1!
 
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