Thats crap, but is this real?
I watched a TV documentary a while back about real life scams & cons. On the show they claimed they had a BJ computer which could predict the next card(s) with something like 80% accuracy. They claimed it worked by the user entering the cards throughout a shoe to map their location, then after the shuffle, by analysing the new locations of cards in the first couple of decks dealt, it could predict the remainder of the cards in the shoe with high accuracy. It also advised on things like spreading or decreasing the amount of spots played and incorrect plays to manipulate the cards. It done more remedial things like RC & TC, advise on bet spreading, etc. On the show, in a mock casino, they used a back counter to input the data and a big player with relayed information via an earpiece.
Do advanced BJ computer like this really exist?