Let's go a little off topic. Some big sports celebrity who liked to play big time baccarat. Convinced a Vegas casino to use only 1 deck and not change it as long as he played. He played for a very long time and won big time. His average was against the odds. Of course the casino cried foul, but could not prove anything. They withheld his winnings to the point he had to SUE to collect. That suit is still pending. They did figure out how he won. It was all their fault from the beginning. (Single deck) Even though the deck was shuffled after every play. It took experts to figure out what happened.
It was new, brilliant and simple. What he did was recognize the back pattern card edges. At the manufacturer for cards they are printed as one sheet then cut into cards. By memorizing the card edge back pattern and knowing how the cards are produced. Knowing the card numbers 1-9 and all the ten's. Winning became easy.
FYI, This was a while ago. Casino's don't sit still when they lose money. The mob quote "It's not personal, it's business." applies to casino's. Don't try it yourself. You will loose kneecaps for sure.