~A 2NT Opener

 

North
S KQ
H AK96
D AJ6
C QJ64
West                                                                                       
S JT95                                                                                   
H J852                                                                                   
D T                                                                                          
C T985                                                                                   

South
S A6
H QT7
D KQT875
C A32

East

S 87432
H 43
D 9432
C K7

With a balanced 20 HCP, North should open 2NT. With 15 HCP and no 4-card major, South should bid 4C (Gerber). North dutifully shows two aces and South is sure the partnership should be in either a Small Slam or a Grand Slam. With all the aces accounted for, South now needs to ask about kings before deciding on a final contract. After discovering that there is a missing K, South selects a 6NT contract.