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Double Attack Blackjack Often grouped together with Spanish 21, Double Attack Blackjack does have a lot of similarities with superslotjet the European version for sure. Perhaps the only difference lies in the fact that Double Attack Blackjack is even more interesting, as it allows doubling of the previous bet, right after the dealer’s two cards are on the table. Some of the common rules of both Blackjack and 21 are as follows.