Card counting is a technique that is used by players of card games to obtain an edge by following cards that have been used. This provides the gambler a concept of the importance of cards, that have to be dealt with. Counting cards is an ability that is more useful in chemin de fer than in any other card game.

In vingt-et-un, a gambler is at an advantage when the remaining shoe contains "big value cards." Big value cards could be faces and aces. The counter in the casino uses these situations by placing larger bets, as and when they happen. Several skillful players use the composition of the deck to adjust their overall plan. Amateur gamblers sometimes have difficulty while engaged in quick counting and could be subject to errors, when it comes to working with dealt cards. Chemin de fer card counting is a business on its own. massive amounts of money are won or spent, by both the gamblers and the casinos, based on card counting strategies in play.

Computing has made its presence known on card counting too, with improved computing power impacting the complete process. Traditional gamblers will attest that a more complicated card counting approach is more prone to error, evening out the extra accuracy allowed by the use of computers. One can dig up many strategies for 21 card counting by visiting web sites dedicated to 21. With the game growing in acceptance in gambling dens all over the globe, there are newer techniques being developed every other day. One can locate easily hundreds of Web sites giving you tips on counting cards and the all-around plan to earn profit playing 21.