The blackjack shoe is an invention bought into land-based casinos back in the 1960s. Today, you'll find that every casino, whether online or land-based, will feature some sort of shoe. This can be either automatic or manual. By making use of these card shuffling machines, it makes the job of counting cards in blackjack totally redundant. With up to 8 decks being constantly added to the shoe, and with many being replaced before a complete deck is dealt out, the card counter has no hope.