Real casinos provide BlackJack players with different sets of rules plus different casino bonuses. Can online casinos compete with real casinos in respect of game variety? Normally, every on-line casino has BlackJack with its sets of rules. For example, online casinos with Microgaming and Cryptologic software offer casino players up to eight different variations of rules. However, some online casinos offer 
various special casino games based on BlackJack rules. You will find interesting to familiarize and try these games, moreover the advantages of casinos compared to them are very weak.
Double exposure Blackjack
Double exposure BlackJack is available in Microgaming and RTG software online casinos. In this kind of Black Jack both cards of a dealer are dealt face up to compensate this advantage of the casino player, the casino dealer wins all ties except for BlackJack. The rest of the casino game based on the rules of BlackJack, and variations may exist in respect of the number of splits, combinations allowed to double, etc.
The advantage of online casinos with the standard rules of this casino game is about 0.7%.
Pontoon
Pontoon is available in Cryptologic and RTG software online casinos. In contrast to ordinary BlackJack the casino player has much more opportunities to double plus the rule of five cards with double paying works out, on the other hand, the casino dealer's cards are dealt face down therefore indefiniteness rises and ties are not in the favour of the dealer. More detailed rules of the game are the following: The game is played with pack of 52 cards, the nominal value of cards is the same as in BlackJack. The hierarchy of combinations is the following:
1. Pontoon ( the same as BlackJack);
2. Five cards combination (five cards without bust);
3. Combination of cards comprising not more than 21 points, the closer to 21 the better
4. Bust (more than 21 points);
The casino dealer deals two cards face up to the player and two cards to himself face down with pontoon check. The game of the dealer is the same as his game in BlackJack: he should take up to 17 and remain on 5 cards or over 16 (except for soft 17).
The casino player has more opportunities: splits are left enabling to one re-split. An opportunities arises for doubling with any quantity of cards, at the same time, the player can continue to buy even after doubling. In contrast to BlackJack the player should buy a card (double) while having not less than 15 points.
As in BlackJack after taking cards the player and dealer compare hands. If the player has extra cards, he loses the game automatically. Pontoon or Five cards combination in case of gain is paid 2:1, other winning combinations are paid 1:1. In case of a tie the dealer wins. There is no insurance or by-bets.
With the casino game based on optimal strategy which is simpler than that of Black Jack. The total advantage of online casinos is 0.17%.
Caribbean21
Caribbean 21 is so far available only in RTG software online casinos. The is played with one pack of cards, in contrast to BlackJack:
1. Ace is always one point;
2. The combination of an ace and two 10 points cards is called Caribbean 21 and is paid 3:2 to the player for the primary bet (but not for the double bets);
3. The player can double on any cards as many times as he wants after doubling it is possible to buy several times;
4. The casino player can split any two cards;
5. The casino player can give in at any time at the same time losing the half of available bets;
6. The casino dealer wins all ties;
7. Initially the casino dealer deals himself only one card face up;
8. If the casino dealer has an open ace, the player can have Caribbean 21 insurance, the insurance is paid 9:1
With the casino game based on optimal strategy advantage of online casinos is not more than 0.2%.
Spanish21
Spanish 21 is so far available only in RTG software online casinos.
The game is played with six-eight "Spanish" packs of cards, 10 are removed from a pack (only 10s, queens, jacks and kings are left). As the less quantity of 10s in a pack is in favour the dealer, the player has the following bonuses:
1. 21 of the casino player always wins, as well as Black Jack of the player beats Black Jack of the dealer;
2. The casino player can double with any number of cards;
3. The casino player can double and buy after split of aces;
4. The casino player can give in after doubling;
5. 5-cards 21s are paid 3:2;
6. 6-cards 21s are paid 3:1;
7. 6-7-8 and 7-7-7 different suits are paid 3:2, of the same suits are paid 2:1 and spades are paid 3:1;
With the casino game based on optimal strategy advantage of online casinos is not more than 0.4%.
Super Fun21
Super Fun 21 can only be found in RTG and Microgaming software online casinos. The game has a range of positive differences from standard BlackJack in favour of the player, to compensate it online casinos pay Black Jack to the player 1:1. The difference is the following:
1. The casino player can split up to 4 times;
2. It is possible to double with any number of cards, including after split;
3. After split of aces it is possible to split, buy and double them;
4. The casino player can give in at any time of the game for a half of a bet (including after split);
5. 20 or less points of the player with 6 cards win automatically if there were no splits;
6. 21 points with 5 cards are paid 2:1 if there were no splits;
7. BlackJack always wins;
8. BlackJack of diamonds is paid 2:1 (all the rest are paid 1:1)
With the casino game based on these rules the advantage of online casinos is not more than 0.75%.
BlackJack Switch
BlackJack Switch is available in PlayTech software online casinos
In contrast to the standard BlackJack the player makes two similar bets and he gets at the same time two hands, the dealer gets two ordinary cards. The casino player can switch upper cards between hands (for example in one hand we have 6, 10 and in the other hand we have 10 and 5. We change place of 10 and 5 and we get instead of two bad hands two good hands: 6,5 and 10,10). The basic rules are the same as in standard BlackJack: there is doubling on two cards, one split and it is possible to double after split. To compensate the change advantage of the player the dealer gets the following bonuses:
1. The dealer does not make BlackJack check;
2. BlackJack of the player is paid 1:1;
3. If the dealer gathers 22, it is considered a tie against any not fired hand of the player, except for BlackJack;
The basic strategy of the casino game is rather complicated, however, if the player follows these rules, he diminishes the advantage of online casinos to 0.05%.
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