It is never advisable to play the optional side bet known as the Blackjack Insurance bet. This option – where available – allows the blackjack player to guard against a Dealer Blackjack. If the dealer’s upcard is an Ace, the player may be given the option of Blackjack Insurance. If the dealer has any 10-value card face-down, the dealer wins. However, with Blackjack Insurance, the player can win 2:1. However, the odds of this bet winning are extremely low and it’s not a good idea to play it.