Card counting is an advanced playing technique that's suitable for most card games. Originally invented by prof Thorp, card counting works by employing a hybrid system to predict which cards are likely to be in the shoe. Based on this estimation, a player can predict whether the deck is in favourable or infavourable position for the player during the game. One should not forget, however, that the card counting techniques are designed for "real world" card decks where there's durability and statistical consistence present across the games, which is not the case with online casinos as most online casino software randomly reshuffles the deck before every game.

The High-Low system assumes that the deck is favourable for the player when it is short on cards from 2 to 8 which might or might not apply to particular games. Shortage on the rest of cards (9, Tens and Aces) is therefore disadvantageous. When the deck is favourable, one should be posting larger bets as they would be in higher likelihood of winning; and vice versa. you should wager larger bets, otherwise, wager smaller ones. Being combined with progressive betting systems, the High Low can become especially powerful, for instance, in Blackjack, where you can combine your Basic strategy and have a nice ready made card counting system.