Card counting is an ability that is employed by gamblers of card games to gain an edge by tracking cards which have been used. This provides the gambler an idea of the value of cards, which need to be dealt with. Card counting is a technique that is more advantageous in twenty-one than in any other card game.

In vingt-et-un, a player has an advantage when the remaining deck houses "big value cards." High cards should be tens or aces. The counter in the gambling den takes advantage of such circumstances by laying bigger bets, as and when they happen. Most accomplished players use the composition of the shoe to adjust their overall strategy. Fairly new gamblers on occasion have problems while engaged in rapid counting and could be subject to errors, when it comes to dealing with dealt cards. Chemin de fer card counting is an enterprise on its own. Millions are made or squandered, by both the players and the gambling halls, depending on card counting schemes in play.

Technology has made its impact on counting cards too, with enhanced computing power affecting the entire activity. Long-established gamblers however swear that a card counting approach of greater complexity is more subject to error, negating the added accuracy enabled by the application of technology. Anyone can locate a lot of schemes for 21 card counting by going web sites devoted to blackjack. With the game growing in popularity in gambling halls all over the world, there are newer plans being created every other day. One can dig up easily a multitude of internet sites giving you tricks on counting cards and the across the board strategy to earn money through black jack.