A pair gives a blackjack player the option to split in some situations, while doubling usually means increasing the wager for one additional card. Choices depend on the pair, dealer card, and table restrictions.
Rules vary, including whether doubling after a split is allowed. Review the placard and use a strategy chart for practice; keep any real-money play within preset limits.
Responsible-use disclaimer: For adults of legal age only. Outcomes are uncertain; set firm time and spending limits, and follow local laws. Gaming should not be treated as income.
