Crossruff Strip
9 7      
 
7 2  
2        
J                  
J   Q 3  
K J   Q  
J         K Q      
8 6      
 
A 8  
8        
Contract is spades.  South to lead.  Win 3 tricks.
Solution:  Play the ace of diamonds followed by the eight of clubs, East is forced to win the second trick.  After winning the second trick East must play either a heart or club.  Regardless of what East returns, Declarer discards a diamond from the south hand.  If the return was a club and West choses to ruff with the jack the Declarer also discards a diamond from the north hand and claims the last two tricks.  If the return is a heart or a club and West refuses to ruff then Declarer wins with a ruff.  Declarer then surrenders a trick to West and takes the final trick with South's remaining trump.