# Study of efficiency

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Successful Blackjack players have already understood that this game is exceptionally mathematical process and in each specific situation there is well-known correlation of the probability of losses and winnings.

Out of a great variety of online games Blackjack is considered to be one of the most honest games for a player. The word “honest” implies that at Blackjack there is no mathematical advantage of casinos over a player unlike Roulette, where casino has the advantage of 2.7%.

Blackjack is the only game where the winning doesn’t depend on Luck, but mostly it depends on your own skills and capabilities. Besides, Blackjack is the main source casino’s profits.

The basic strategy of this game is based on the hypothesis about the uniformity of cards of different suits that leave the game. It means that the probability of Ace appearance is 1/13 or the probability of a 10’s appearance is 4/13. But as cards leave the game unevenly, then the strategy isn’t considered to be optimal, it is just basic one. But for skilled players it can become the starting point in the further checking of the situation at the playing table.

So, the basic strategy shows, whether it is worth taking an additional card for a player, coming out of his or her own cards and one known card of the dealer.

As it was said earlier, cards leave the game unevenly, and that’s why one method was invented to correct actions. It is card counting. The most popular system of card counting is called “Plus-minus”. According to it the value +1 is assigned to 2, 3, 4, 5 and 6; 0 – to 7, 8 and 9; -1 – to Aces and 10. Having summed up all points of cards that leave the game, we get the real counting. Plus means that there are less 10-s in the pack, minus means that there are more 2-s, 3-s and etc.