Blackjack half

ACE

In a standard deck, this card can be worth one or eleven, often deciding the fate of a 21-point hand.

In blackjack, an ace can be worth either 1 or 11, making it one of the most valuable cards in the game. The clue "Blackjack half" hints at the word "ace" because it’s half of "blackjack"—the game’s name comes from the original winning hand of an ace plus a jack (or ten-card). So, by splitting "blackjack" in half, you’re left with "black" and "jack," but the key card here is the ace, which defines the hand’s power.