First of all, I am not promoting gambling here. I am definitely against gambling, whether or not money is involved. I am promoting the understanding of probability.
How is Blackjack or 21 played?
Each player plays his hand independently against the dealer. At the beginning of each round, the player places a bet in the "betting box" and receives an initial hand of two cards. The object of the game is to get a higher card total than the dealer, but without going over 21 which is called "busting", "breaking", or many other terms. (The spot cards count 2 to 9; the 10, jack, queen, and king count as ten; an ace can be either 1 or 11 at the player's choice). The player goes first and plays his hand by taking additional cards if he desires. If he busts, he loses. Then the dealer plays his or her hand. If the dealer busts, he loses to all remaining players. If neither busts, the higher hand total wins. If a player ties with the dealer the hand is a "push" and the player's bet is returned.
What do you think is the cut-off point for the dealer representing the casino?
The answer is 17! Yes, 17 Again! (Not the movie though)
If the dealer has less than 17, he must hit. If the dealer has 17 or more, he must stand (take no more cards), unless it is a "soft 17" (a hand that includes an ace valued as "11," for example a hand consisting of Ace+6, or Ace+2+4). With a soft 17, the dealer follows the casino rules printed on the blackjack table, either to "hit soft 17" or to "stand on all 17's."
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