A thoughtfull defense.
Bridge Column for June 21, 2002, Harvey Bernstein
Both sides vulnerable.  South deals.
                              North
                              S: Q 9 5 3          
                              H: 9 2         
                              D: J 7         
                              C: A K J 8 3
            West                             East
            S: 6                             S: Void         
            H: 10 8 7 6 3                    H: K J 5 4    
            D: K Q 9 5 4 2                   D: A 10 8 6          
            C: 6                             C: Q 10 9 7 5  
                              South                         
                              S: A K J 10 8 7 4 2
                              H: A Q        
                              D: 3         
                              C: 4 2      
          The Bidding:  
                  South    West    North    East                  
                   1S      Pass     2C      Pass
                   3S      Pass     4S      Pass
                   4NT     Pass     5D      Pass
                   6S      Pass     Pass    Pass
     The opening lead is the king of diamonds.  Cover the East
and West hands and decide how you would play for twelve tricks.
     Most of the time, East will play the ten or eight of
diamonds and when the king holds, West will lead another diamond,
which will be trumped by South.  
     Declarer will draw the outstanding trump and play on clubs
in the hopes of establishing a long club trick for a heart
discard.  When the club position becomes known, declarer will try
the heart finesse and with the king onside, will make his
contract.
     An alert East, however, will realize that declarer did not
bid a small slam with two small diamonds.  He will overtake the
king of diamonds with the ace and return the jack of hearts. 
Declarer is now faced with his heart decision before he knows how
the clubs will divide.  Most declarers will win the ace of hearts
and in the fullness of time, lose a trick to the king when the
clubs break badly.
     This is a good example of "keeping your head in the game". 
It is very easy to just follow suit.  Your game will improve when
you start to see plays like this one.
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Bernstein is a free-lance writer in Solon.