Anyone who has played blackjack understands that the aim is to go as close to 21 as possible without going over. However, the game is said to have originated in Italy as Thirty One, which goes back to the 15th century. The aim is identical (to get as near to 31 as possible), but there are a few differences: all cards numbered 8 through 10 are eliminated from the deck, and face cards are worth one-half their face value.