“21点”是一个古老的扑克牌游戏，游戏规则是：各个参与者设法使自己的牌达到总分21而不超过这个数值。扑克牌的分值取他们的面值，A充当1分或者11分(由玩家自己确定选择一种分值)，J、Q和K人头牌都是10分。

庄家对付1~7个玩家。在一局开始时，包括庄家在内的所有参与者都有两张牌，玩家可以看到他们的所有牌以及总分，而庄家有一张牌暂时是隐藏的。接下来，只要愿意，各个玩家都有机会再拿一张牌。如果某个玩家的总分超过了21(成为“引爆”)，那么这个玩家就输了。在所有玩家都拿了额外的牌后，庄家将显示它隐藏的牌。只要庄家的总分等于或小于16，那么他就必须再拿牌。如果庄家引爆了，那么还没有引爆的所有玩家都将获胜。否则，将余下的各玩家的总分与庄家的总分作比较，如果玩家的总分大于庄家的总分，则玩家获胜。如果两者的总分相同，则玩家与庄家打成平局。

-"Excellent counting systems available" is an old poker game, the game is ： all participants to make his cards total 21 and not to exceed the value of the header values. playing cards for their face value, a as 1分- by himself or (players for a header values), and j, q and he heads the cards are 10. the deal with a ~ seven players in a game start, including the all participants are two cards, the player can see all their cards, and marks and the dealer has a card for a hidden. next, as long as you like, the players have the chance to get a card. if the players final score more than 21 (as "triggering"), the players lost. in all players have an extra card, the makers will show it to hide the card.