Some blackjack players employ the tactic of card counting to give them an advantage over the house. Card counting is essentially the practice of keeping track of the cards that have been dealt in order to derummy noble alltermine how likely it is that particular cards will be dealt in subsequent hands. By doing this, players can take advantage of circumstances where the odds are in their favor by modifying their wagers and play choices. Players can choose from a variety of card counting systems, each with its own set of guidelines and techniques for managing the cards. The Hi-Lo system is the most popular card counting method.