The Blackjack is a very simple game, in fact you simply need to try to draw as near as more possible to the score of 21 without never going beyond it, but in the online casinos  by now there are a lot of variations of this game available, which certainly are a bit different from the traditional Blackjack game, others instead have some particular rules that are better to  know well if you want to play and to have some good results.  

Normally with the classical Blackjack is  played with only  with one pack of cards, but there are variations in which are used 8 packs in the game  (Blackjack Atlantic City) 5 packs (Blackjack Big Five) or 4 packs (Blackjack Vegas Strip),  also this last  version is very diffused  with only one pack, denominated Blackjack Vegas Single-Deck.  

In almost all of the variations of Blackjack the bank is always with 17, and this is not a casual movement, maintaining that score the bank has a good margin of advantage on the player that on the  contrarily tries  always to get as near as  possible to 21.  

When it speaks about the  doubling  contrarily of the cards or instead of split, the things can vary a lot.  

Normally in the Classical Blackjack the doubling is allowed only on 9, 10 and 11, in the most diffused variations in the online casinos  the doubling instead is allowed every 2 cards .  

Also the dividing of the cards is subject  of  changes, in the classical Blackjack you can divided your own cards once only, instead in the most common varying online, the player can also come to divide the cards 3 times, a variation is usually adopted to this rule for the aces that can be divided once only.  

Also in  this case of the division of the aces have different rules  for the number of cards that  can be asked, for example in the Blackjack Atlantic City, and in the variations Big Five, Vegas Downtown and Vegas Strip it is possible to receive  only one card after having divided the aces; instead in the European Blackjack you can be required more cards.  

Other differences are in the moment in which the player wants to retire himself from the hand before he has a conclusion, in some varying ones such as the Blackjack Big Five and the Blackjack Atlantic City, this opportunity is given to the player, in others as the European Blackjack, the Vegas Downtown or the Vegas Strip the player cannot retire from his hand before he has concluded.  

Some of these variations have more particular rules , for esempion in the Blackjack Double Exposure all the cards of the bank stay uncovered, giving so an initial advantage to the player in the choice of his own strategy of game, but to balance the thing in case of   a draw the bank wins.  

As it is easy to understand  you benefit on one side but have disadvantaged by the other. In the Blackjack Triple 7 besides the normal bets it is possible to try to win  some further  extra wins with a bonus that is lavished in base to the cards with the value of 7 that have been  touched during the course of the hand , till to reach the most substantial bonus a progressive bonus, that can be gotten holding three 7's of diamonds.