二十一点算牌也许是二十一点玩家使用最广泛的技术，以改善他们在二十一点游戏中的赔率。它是一种在赌场流行的技术，所以不要急于运用，在开始运用之前，你需要对它做一个研究，以及做一些有趣的练习，甚至现在还有一个叫iPhone的应用程序帮助你做这些。显然，这说起来容易，做起来难，在网上玩二十一点游戏时，不会有任何人向你提供帮助。

　　在二十一点的赌桌上，赌徒通常没有超人的记忆，但他们使用一些技巧，帮助他们更好地预测，很可能会来的卡的类型是什么。

　　算牌背后的理论在于52或52倍数的高比例的牌面。玩家在赌场的优势需要有高比例的牌面。

　　一般来说，你应该谨慎投注，如果你认为有大量的高比例牌面，可以积极投注。

　　那么你怎么算才能使你手上的卡不容易被其他玩家推测到？有许多不同的计数卡的方法 - 下面是一个简单计数方法，称为HI -罗法

　　您可以将各点数设成以下值：1，0或-1，都算为-1， 7，8，9算为0，而 2，3，4，5和6算为1。

　　随着比赛的进行，你保持一个运行的总比分。得分越高，就更容易赢得你的赌注。如果得分在ll点左右，游戏的继续进行将不利于玩家。较低的得分（即较高的负值），在这种情况下赌注会让人感到胆怯。

　　继续努力发挥一个完美的战略（即点你双降，打，留等）。计数得分的卡应该只影响您的投注水平（即您实际上下的所有赌注）。在这一点，你必须重置您的计数

　　其他的事情，你需要知道的，如果你的卡计数得分在+2或更高的点数，你应该增加你的赌注。

　　所以这是最基本的制度。我们将来会制定一些更复杂的系统，以增加二十一点游戏的乐趣。

　　译文：

　　Card Counting in Blackjack. What is it and How Do I Do it?

　　Blackjack card counting is perhaps one of the most widespread techniques used by blackjack players to improve their odds at 21. This is not a technique that is popular with the casinos, so don?t get caught doing it, but it?s an interesting exercise to study. There?s even an iPhone app out now that will help you do it. Obviously this is easier done when playing online blackjack, as you won?t have anyone looking over your shoulder.

　　Blackjack card counters do not have superhuman memories- rather they use tricks to help them to better predict the type of card that is likely to come out of the shoe.

　　The theory behind card counting is that in a card deck of 52 （or multiples of 52 for multiple deck games）  a deck that has a high percentage of face cards and aces gives the player an edge over the casino. This is because, among other reasons, a ‘natural’， （ace and a 10-value card）， pays out 3-2,  whereas the casino only wins the bet with a blackjack.

　　If the casino deals itself a low hand first off （1st 2 cards） with a score of between 12 and 16, they must draw and are more likely to go bust if there are lots of high value cards about. Basically a deck with lots of face cards gives you, the player, an edge. A deck with lots of low value cards, gives the dealer an edge.

　　Generally speaking, you should be betting cautiously if you think there are lots of low cards left and betting aggressively if you think there are lots of faces, 10s and aces left.

　　So how do you count the cards easily without being a total egg-head? There are many different card counting methods – Here?s one of the simpler ones called the Hi-Lo Method

　　You attach a point value of +1, 0, or -1 to every card dealt to everyone playing, including the dealer. Aces, face cards and 10s are counted -1. 7, 8, 9 have a value of zero. 2, 3, 4, 5, and 6 each count as +1.

　　As the game progresses, you keep a running total of the score （it?s much easier to do this in a relative fashion like this）。 The higher the score, the better for you so up you bets. if the score is around nill points, the deck neither favours the player or the casino. The lower the score （ie the higher the negative value）， the worse for you – in this case bet timidly.

　　Continue to try and play to a perfect strategy （ie the points at which you double down, hit, stay etc）。 The card counting score should only affect your betting level （or whether you actually bet at all）。

　　The other thing you need to be aware of （particularly when playing online） is the number of decks used in the game and when the pack is shuffled. （At which point you have to reset your count）。

　　If your card counting score is +2 or higher in a single deck game, you should up your bets. For multiple deck games your bet should be moved up when the REAL COUNT （or TRUE COUNT） is +2 or more.

　　To get to the TRUE COUNT, divide your score by the number of decks that are yet to be played （so you need to keep a track of the overall number of cards that have been dealt between shuffling. If you are playing online, read the smallprint and make sure you understand when the cards are shuffled.

　　So that?s the most basic system. Give it a go, and keep posted as we?ll be featuring some more complex systems in the future. Happy counting!