Counting cards is a skill which is used by gamblers of card games to gain a benefit by following cards that have been played. This provides the player a concept of the sum of cards, which need to be dealt with. Card counting is an ability that has more use in twenty-one than in any other card game.

In vingt-et-un, a player is at an advantage when the remaining deck has "big value cards." Big value cards should be faces and aces. The counter in the casino takes advantage of these opportunities by laying bigger bets, as and when they occur. A good many skillful gamblers use the composition of the shoe to adjust their overall tactic. Amateur gamblers on occasion have problems while trying rapid card counting and may be subject to errors, when it comes to working with dealt cards. Chemin de fer card counting is an enterprise on its own. huge amounts of money are won or squandered, by both the gamblers and the gambling dens, based on card counting tactics in use.

Computing has made its presence known on card counting too, with refined computing power impacting the entire process. Long-standing gamblers however swear that a more complex card counting system is more subject to breakdown, negating the extra accuracy permitted by the application of computers. Anyone can dig up a lot of strategies for black jack card counting by visiting web pages devoted to black jack. With the game increasing in acceptance in gambling dens around the planet, there are better techniques being created every other day. One can dig up at least thousands of internet sites providing you pointers on counting cards and the overall tactic to earn money playing 21.