Power blackjack is a variant of the card gambling game blackjack, modified by certain doubling and splitting rules, called "Power Double" and "Power Split," that are advantageous to the player, offset by the rule that, when the dealer makes a total of twenty two, any active player hands push rather than winning.
The main variations are: If the player's two-card total is nine, ten or eleven (in some casinos, only ten and eleven, and in some casinos soft 19 and 20 are included) and the player doubles, the player has the option of discarding the double-down card received and replacing it with top (unseen) card from the shoe.
This option increases the favorability of doubling opportunities.
Furthermore, a player needs to learn the additional strategy of when to replace the first double-down card to take maximum advantage of this rule variation.
After a power-split, all regular double-down and split actions are allowed, but power-split and power-double options are no longer allowed.