Deviations in blackjack are the different ways that the game can be played, and they all lead to different outcomes. There are many different deviations, but the most common are doubling down and splitting.
Doubling Down
Doubling down is when a player puts two additional cards into play, hoping to achieve a higher total. For example, if a player has an 8 and a 10, they can put in a 2nd 10 and hope for a total of 12.
If the dealer has an Ace, the player would lose the hand (since their Ace would not make up the total).
Doubling down is generally considered to be a bad strategy, as it significantly increases the chances of losing. However, in some cases it can be an optimal strategy.
For example, if the player is very sure that they will win regardless of what the dealer does, then doubling down is a good way to increase their chances of winning.
Split
Splitting is when a player takes one card off of their hand and gives it to the dealer. This usually happens when there are no other good cards to put into play.
For example, if a player has an 8 and a 10, they can either keep both cards or give away the 10 to the dealer. If the dealer has an Ace, then the player would win that hand (since their Ace would make up the total).
Splitting is generally considered to be a good strategy, as it decreases the amount of money that needs to be bet by the player. It also gives them more opportunities to win hands (since they have another card left in their hand).
