Just to be clear the markings on the back didn't precisely give away the value of the cards. What they did do was allow Ivey to sort the cards into buckets (by

Just to be clear the markings on the back didn't precisely give away the value of the cards. What they did do was allow Ivey to sort the cards into buckets (by flipping some cards 180 degrees) such that he could tell which of two buckets any given card was in based upon the markings.