9.4 Stealing
You can also establish tricks by way of stealing your high card from defender's highest card.. 





Look at the hand diagram at the left. You don't have any chance to make any tricks if East was holding A.  If West is holding A you can make a trick:
You lead a card from hand to dummy's King. If West does not overtake with ace, you will make a trick with dummy's K. If West overtakes with A, you can play 8. Later, when you get lead, you can make a trick with your  K. 

You may create a trick by stealing your high card, if it is at the right place (after opponent's master card). This is also the definition of finessing. So, if you think that one can not steal his own card, you may  use finnesing instead of stealing..