After a player has split a pair in blackjack, most casinos allow him or her to “double down” on either or both of the new two-card hands. This is called “double after split” and provides an advantage to the player of about 0.12%.
After receiving his initial two cards, the player has four standard options: he can “hit,” “stand,” “double down,” or “split a pair.” Each option requires the use of a hand signal. At some casinos or tables, the player may have a fifth option called “surrender.” Hit: Take another card from the dealer. signal: (handheld) Scrape [...]
