I think is players have multiple options for doubling down. They can double down on any number of cards, including after splitting pairs. This means that if a player receives a pair, they can split the cards and then double down on any or all of the resulting hands. Additionally, players can double down after performing a hit. For example, if a player receives a hand with a value of 11 and decides to hit, they may receive a card that brings the value of the hand