Splitting A Pair
When a player is dealt two identical value cards such as two 3's, two 7's and so on, the player can split these into two separate hands if he so chooses. By the way, and combination of two face cards such as a 10 and a jack, or a queen and a king are also considered a pair of tens. To split a pair the player turns the cards up, separates them and places them in front of his bet. He then must add an equal amount to the new additional hand as a wager. Each of these hands is played separately, using the usual signals to hit or stand. Its possible to win one hand and lose the other. If the first card dealt is of equal value to the original split cards, that card may be split as well into a third hand, with the exception of Aces. When a player splits Aces, he is allowed only one card on each hand and may not draw again no matter what card is drawn.
For more in depth information on rules and strategies of black jack: