Card counting is a skill which is employed by players of card games to obtain a benefit by tracking cards that have been played. This gives the gambler a theory of the sum of cards, which have to be dealt with. Card counting is a skill that has more use in chemin de fer than in any other card game.

In vingt-et-un, a gambler has an advantage when the remaining deck houses "high cards." Big value cards can be 10s or aces. The counter in the gambling hall brings into play such opportunities by laying larger wagers, as and when they occur. A good many adept gamblers use the makeup of the deck to adjust their overall strategy. Fairly new players at times experience difficulty while performing quick counting and might be subject to mistakes, when it comes to working with dealt decks of cards. Vingt-et-un card counting is an enterprise by itself. massive amounts of money are won or squandered, by both the gamblers and the gambling halls, depending on card counting techniques in play.

Computing has made its presence known on counting cards too, with improved devices affecting the complete activity. Traditional players will argue that a card counting system of greater complexity is more subject to breakdown, evening out the added accuracy allowed by the application of technology. One can discover a lot of game plans for blackjack card counting by visiting net pages dedicated to the game. With the game growing in popularity in casinos around the world, there are newer tactics being developed every other day. One can find literally hundreds of Web pages providing you hints on card counting and the all-around strategy to make money through 21.