BlameThePixel!

Quoted :: C1

In black jack, has anyone heard of "split". I never heard of this rule until I was watching celebrately black jack last nite.

Quoted :: Doubling Down
Among the more profitable player options available is the choice to "double down". This can only be done with a two card hand, before another card has been drawn. Doubling down allows you to double your bet and receive one, and only one, additional card to the hand. A good example of a doubling opportunity is when you hold a total of 11, say a (6,5) against a dealer's upcard of 5. In this case, you have a good chance of winning the hand by drawing one additional card, so you might as well increase your bet in this advantageous situation. If you are playing in a face-down game, just toss the two cards face-up on the table in front of your bet. In either type of game, add an additional bet to the betting circle. Place the additional bet adjacent to the original bet, not on top of it. The dealer will deal one additional card to the hand. In the face-down game, he'll probably tuck it face-down under your bet, to be revealed later.
Players are allowed to double down for any amount up to the original bet amount, so you could double down "for less" if you wanted. Just remember that you do give up something for being allowed to increase your bet: the ability to draw more than one additional card. If the correct play is to double down, you should always double for the full amount if possible.

Quoted :: Splitting Pairs
When you are dealt a matching pair of cards (remember, ignore the suits), you have the ability to split the hand into two separate hands, and play them independently. Let's say you are dealt a pair of eights for a total of sixteen. Sixteen is the worst possible player hand, since it is unlikely to win as is, but is very likely to bust if you draw to it. Here's a great chance to improve a bad situation.
If you are playing a hand-held game, toss the cards face-up in front of your bet just like a double down. Then, in either type of game, place a matching bet beside the original bet in the circle. Note that you must bet the same amount on a split, unlike a double-down, where you are allowed to double for less. The dealer will separate the two cards, and treat them as two independent hands. Let's say you draw a 3 on the first 8, for a total of 11. Many casinos will allow you to double down on that hand total of 11 at this point. When this is allowed, the rule is called "Double after Split", predictably enough. Regardless, you can play the first hand to completion, at which point the dealer will deal a second card to the second hand, and you can begin making play decisions on it.

If you get additional pairs (in the first two cards of a hand), most casinos will allow you to resplit, making yet another hand. The most common rule allows a player to split up to 3 times, making 4 separate hands, with 4 separate bets. If double after split is allowed, you could have up to 8 times your initial bet on the table if you chose! Some casinos restrict resplitting, and some allow unlimited splitting. Another fine point is that you are allowed to split any 10-valued cards, so you could split a (Jack, Queen) hand. However, this is usually a bad play: Keep the 20.

The other complication for pair splits concerns splitting Aces. Splitting Aces is a very strong player move, so the casino restricts you to drawing only one additional card on each Ace. Also, if you draw a ten-valued card on one of your split Aces, the hand is not considered a Blackjack, but is instead treated as a normal 21, and therefore does not collect 3:2 odds. Some casinos allow resplitting Aces if you draw another, while many do not allow resplitting Aces although they often do allow resplitting of any other pairs. With all these restrictions, you may wonder whether it makes sense to split Aces. The answer is a resounding YES. Always split pairs of Aces.

Quoted :: HarrY

you can plit up to three times in one hand?
didn't know that, i allways thaught you could only split once.....