Both sides vulnerable.  
South deals.
                              North
                              S: A K 7 2                
                              H: 9 6 4         
                              D: A 9 5 3     
                              C: 8 2  
            West                             East
            S: Q J 10 8 6 3                  S: 9 5 4       
            H: K J 8 2                       H: 10 7 5      
            D: K 4                           D: 8 7 6                  
            C: K                             C: 10 9 5 3    
                              South                         
                              S: Void   
                              H: A Q 3      
                              D: Q J 10 2
                              C: A Q J 7 6 4         
          The Bidding:  
                  South    West    North    East                         
                   1C       1S      1NT     Pass
                   2D      Pass     3D      Pass     
                   4NT     Pass     5H      Pass
                   6C    (All Pass)
          opening Lead: SQ
     We were playing rubber bridge when I "took a shot" at this small slam.
I could have played in diamonds but with a spade void I wanted the trump
length.  The opening lead gave me two heart discards.  I wanted to test 
diamonds before playing clubs so I played a heart to the ace and played the
queen of diamonds.  West ducked and I held my breath and called for the 
three.  East played the six and I was halfway home.
     The jack of diamonds was covered by the king and the ace from dummy.
I led a small club next and East played the three.  I played the jack, 
losing to the king.  The bad news was that I had no way to pick up the
ten of clubs and as a result, I was down one.
     Thinking about the hand later, I realized that the club finesse was
a knee jerk play.  The only holding that gains a trick is when East holds
specifically the KX of clubs.  Anytime clubs break 3-2 the contract makes.
The safest play is to just plunk down the ace of clubs.  Now, any 3-2 club
break plus any 4-1 holding with a singleton king works just as well.
     Maybe next time I will see it in time to make the right play.