Card counting is an ability which is employed by players of card games to achieve an edge by tracking cards that have been dealt. This provides the player a theory of the value of cards, that have to be dealt with. Card counting is a skill that has more use in blackjack than in other card game.

In blackjack, a gambler has an advantage when the remaining deck houses "big value cards." High cards can be 10s or aces. The card counter in the gambling den brings into play such situations by laying greater wagers, as and when they occur. Many skillful gamblers use the composition of the deck to alter their overall tactic. Inexperienced players occasionally have difficulty while engaged in rapid card counting and might be prone to errors, when it comes to working with dealt decks. Vingt-et-un card counting is a business on its own. Millions are won or spent, both by the gamblers and the casinos, based on card counting methods in use.

Computing has made its presence known on counting cards too, with refined computing power affecting the complete activity. Long-established players will vow that a card counting scheme of greater complexity is more subject to breakdown, evening out the extra accuracy allowed by the use of computers. One can find a lot of tactics for chemin de fer card counting by visiting online resources dedicated to vingt-et-un. With the game growing in appeal in casinos around the world, there are better plans coming up every other day. One can discover easily hundreds of Web pages giving you hints on card counting and the overall scheme to earn profit through vingt-et-un.