<Li> Players can make larger bets when they have an advantage . For example, the players can increase the starting bet if there are many aces and tens left in the deck, in the hope of hitting a blackjack . </Li> <Li> Players can deviate from basic strategy according to the composition of their undealt cards . For example, with many tens left in the deck, players might double down in more situations since there is a better chance of getting a good hand . </Li> <P> A card counting system assigns a point score to each rank of card (e.g., 1 point for 2--6, 0 points for 7--9 and − 1 point for 10--A). When a card is exposed, a counter adds the score of that card to a running total, the' count' . A card counter uses this count to make betting and playing decisions according to a table which they have learned . The count starts at 0 for a freshly shuffled deck for "balanced" counting systems . Unbalanced counts are often started at a value which depends on the number of decks used in the game . </P> <P> Blackjack's house edge is usually between 0.5%--1% when players use basic strategy . Card counting can give the player an edge of up to 2% over the house . </P>

When do you double down in black jack