Card counting is a skill that is used by players of card games to obtain a benefit by following cards that have been played. This gives the gambler a theory of the sum of cards, that need to be dealt with. Card counting is an ability that has more use in 21 than in any other card game.

In 21, a player has an advantage when the remaining shoe houses "high cards." High cards should be 10s or aces. The counter in the casino uses these circumstances by placing greater wagers, as and when they occur. Most accomplished players use the makeup of the shoe to change their overall course of action. Amateur gamblers at times will have problems while trying fast card counting and could be subject to errors, when it comes to dealing with dealt decks. Vingt-et-un card counting is an enterprise on its own. Millions are made or lost, both by the gamblers and the gambling dens, depending on card counting methods in use.

Computing has made its presence known on card counting too, with enhanced devices impacting the entire process. Old guard players however vow that a more complex card counting system is more prone to problems, canceling out the added accuracy permitted by the application of technology. Anyone can dig up a lot of plans for vingt-et-un card counting by visiting net resources devoted to the game. With the game growing in fame in casinos around the globe, there are newer tactics being developed every other day. One can dig up at least thousands of Web sites giving you tricks on card counting and the across the board tactic to make money playing blackjack.