#10 Both Vulnerable
North   East   South   West
    1♦       Pass      1♠       Pass
  1NT      Pass     4♠        AP
                       
                                                North (dummy)
                                                ♠ Q 9
                                                ♥ Q 10 6 5
                                                ♦ A K 5 4
                                                ♣ K 9 8
                        West (you)                                  East
                        ♠                                                     ♠ K 7 3 2
                        ♥                                                     ♥ J 9 8 7
                        ♦                                                      ♦ 10 9
                        ♣                                                     ♣ A Q 7
                                                South (declarer)
                                                ♠
                                                ♥
                                                ♦
                                                ♣
 
West leads the ♣J. North plays low. West continues with two more clubs with East winning the ♣A and exiting with the ♥J. South wins the ♥A and crossed to dummy to lead the ♠Q. What is East’s play?
 
As East, when the ♠Q is led from dummy, do not cover. Cover an honor with an honor when there is a trick to be promoted. The bidding has told you that partner has at most one spade so no promotion is possible for either you or partner. In addition, your spade length guarantees you a trick if you play low twice because the dummy will no longer have a spade to lead through you!
Rule: Do not cover honor cards led from the dummy in declarer’s known long suit when no promotion is possible for either you or your partner.
 
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