(b) if the first face up card dealt to the dealer is an ace, king, queen, jack or 10 and a player has blackjack, the dealer shall announce the blackjack but shall make no payment nor remove any cards until all other cards are dealt to the players and the dealer has turned over his or her second card, and if, in such circumstances the dealer's second card does not give him or her blackjack, the player having blackjack shall be paid at odds of 3 to 2 but if, however, the dealer's second card gives him or her blackjack, the wager of the player having blackjack shall be void and constitute a stand off;