Both sides vulnerable.  
North deals.
                              NORTH
                              S: K 10              
                              H: A J 10 8 7 5 4 2
                              D: Void        
                              C: Q 7 2   
            WEST                             EAST
            S: J 9 4                         S: Q 8 5 3      
            H: 3                             H: K Q 9 6    
            D: J 10 8 6 4 3                  D: K Q 7             
            C: J 9 3                         C: 10 5        
                              SOUTH                         
                              S: A 7 6 2
                              H: Void       
                              D: A 9 5 2   
                              C: A K 8 6 4
          The Bidding:
                  NORTH    EAST    SOUTH    WEST                  
                   1H      Pass     2C      Pass
                   2H      Pass     2S      Pass
                   3C      Pass     3D      Pass
                   3H      Pass     3S      Pass
                   4S      Pass     5C      Pass
                   6C      Pass     Pass    Pass
	Opening Lead: 3H
     Before reading on, decide if you wish to declare or defend 
this contract.
     When this hand was actually played, North-South did well to
reach the only playable slam.  At trick one declarer called for
the heart ten from dummy, covered by East and trumped low.  A
spade to the king provided an entry for the lead of the heart
jack, covered by East and trumped low.
     This was the moment of truth.  West rose to the occasion by
refusing to over trump.  Declarer found himself lacking the
entries to enjoy the long hearts.                    
     On the other hand, if declarer wins the first heart with the
ace and then ruffs a heart, West must refuse the over ruff to
have any chance.  Declarer continues with the ace of clubs
followed by a club to the queen.  Another heart is led from dummy
and West should still refuse to over trump.  Declarer leads a low
diamond and trumps with North's last club.  Another heart is led
and East is allowed to hold this trick as declarer discards a
losing diamond or spade.
     At this point declarer will win any return in hand, draw the
last trump and enter dummy by way of the spade king to win the
balance of tricks with long hearts.
     Conclusion:  You should elect to play six clubs after a
heart lead, but you should play it very carefully.
___________________________________________________________________