Splitting - when the player has two cards of equal value he may place a second bet equal to his first and the two cards are split and another card drawn to each card creating two separate hands, these hands are then played as normal. Double - some casinos will restrict the totals which you can double with, only doubling with a hard total of 9,10 or 11 is a fairly common rule. Splitting - a casino may not allow you to split ten value cards or may not allow more than one card to be drawn to split ace s, also some casino will limit the number of times you can split a single hand and whether or not you can double a split hand. Insurance - some casinos only allow you to take insurance if you are holding a blackjack. Surrender - many casinos do not give this option but when available it is normally a variation called late surrender, this is when the dealer checks his card to see if he has blackjack before allowing players to surrender.
Early surrender is very rare and is done before the dealer checks for blackjack.
Hit soft 17 - in some casinos the dealer will take a card when he has a soft total of 17. No hole card - some casinos will only give the dealer one card to start with, he will then draw his second card after all the players have completed their hands. As an example here are the rules used in all casinos in the United Kingdom. Surrender - NO surrender. There are also some major variations on blackjack, one of these is called double exposure blackjack and another is called Spanish 21.