East-West vulnerable.  
South deals.
                              North
                              S: Void             
                              H: A 4 2       
                              D: A J 9 5 4   
                              C: A J 8 7 2
            West                             East
            S: A J 9 7 4 2                   S: Q 10 5   
            H: K J 10 5                      H: 9 8 7 3    
            D: 6                             D: 3                 
            C: K 9                           C: 10 6 5 4 3  
                              South                         
                              S: K 8 6 3
                              H: Q 6        
                              D: K Q 10 8 7 2
                              C: Q        
          The Bidding:  
                  South    West    North    East                  
                   1D       1S      2S      Pass
                   3D      Pass     6D   (All Pass)
          Opening lead: SA
     This hand came up during a duplicate game.  South opens the
bidding with one diamond.  This is a very thin opening bid but
there is a rebid and two diamonds would be a poor choice because
of the four card spade suit.  West made a very normal one spade
overcall.  North obviously needs more information from his
partner.  His two spade cue-bid simply says I have a good hand
and need to know more about your hand.  South has an easy diamond
rebid.
     At this point, North knows that partner has a minimum opener
with five or six diamonds.  He could bid Blackwood for aces but
he knows that the likely answer will be five clubs, or none. 
Asking for kings would be dangerous because if South has more
than one king the answer would be six hearts or six spades which
would preclude a small slam in diamonds.  
     Instead of confusing the issue with some other bid, North
decides to ignore the grand slam possibility and just bid six
diamonds.  West led the ace of spades, ruffed by declarer.  When
the king of clubs fell doubleton, the jack of clubs provided a
resting place for a small heart and thirteen tricks was easy.
     This was a top score on the board as many pairs stopped at
three no trump making nine or ten tricks.    
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