Neither side vulnerable.  
West deals.
                              NORTH
                              S: 7 5 4            
                              H: Q 8 7       
                              D: J 6 4       
                              C: 7 5 4 3 
            WEST                             EAST
            S: Q 10 9 6 2                    S: K 8          
            H: 10 6 3                        H: J 9 5 4 2  
            D: 10 9 7                        D: K 5 2             
            C: 9 6                           C: 10 8 2      
                              SOUTH                         
                              S: A J 3 
                              H: A K        
                              D: A Q 8 3   
                              C: A K Q J
                   WEST   NORTH    EAST   SOUTH                   
                   Pass    Pass    Pass    3NT 
                   Pass    Pass    Pass
     Opening Lead: S6 
     In a team game, a hand is played at two tables.  At one
table, teammates sit East-West, and at the other table, North-
South.  The team then compares results.  If the same result was
obtained each time the hand was played, then there is no score. 
This is rarely the case.  Take this hand as an example.  Both
South players bid three no trump and faced a spade lead to the
king.
     One declarer took the spade ace at trick one and, having no
entry to dummy, eventually played diamonds from his hand.  If
West held the king of diamonds, this line would work because the
jack of spades would become a second stopper in that suit. 
     Unfortunately, the king of diamonds was with the East hand
and a lead through the jack of spades defeated the contract.
     The other declarer ducked the king of spades and won the
spade continuation with the ace.  He cashed the two top hearts
and three of his top clubs.  He then played the ace of diamonds
and the queen of diamonds.  When this was allowed to hold he
played the three of diamonds to the jack and East's king.  East
had only hearts remaining and South made two over tricks.  Had
West held the king of diamonds the contract would have failed.
     Both declarers missed a play that would virtually guarantee
the contract without regard to the location of the king of
diamonds.  South should duck the first trick and win the sapde
continuation.  Three rounds of winning clubs are followed by the
top two hearts.  South can now play the jack of spades.  West can
win three spade tricks, but then must play either a heart to the
queen in dummy or a diamond to declarer's ace-queen.  In either
case, the forced red card return ensures nine tricks.
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