21 points have a long history, around 1700 French casino there is this 21-point card game. French: vingt-et-un (literally 20 and 1, because the complexity of the French character itself is simple 21), so after the popular game is called "21". In 1931, when Nevada announced that gambling was a legitimate activity, the Blackjack game was first publicly appearing in the casino club in Nevada, within 15 years, it replaced the dice game and became a very popular casino dealer in gambling game The
Appeared in Asia in 1957 in Hong Kong for the first time, and then quickly developed, five years less than the time to develop with the card nine, mahjong together to become the Chinese favorite three games.
With the development of the Internet, twenty-one began to network era, such as the Philippines, the gaming company has the game.