Marked Cards
Marked cards are cards that have been illegally altered so that their value can be read from the back. They give an unfair advantage to a cheater.
The simple explanation
If the back of a card has a small mark, a cheater can tell what the card is. It is a form of cheating.
A closer look
Cards can be marked by pricking, nailing, waving or by ink or other means. Casinos use new decks often and look for marks. If you see marks, tell the floor at once. Playing with marked cards is illegal.
A practical example
A player notices a small mark on the backs of several cards and calls the floor.
Full explanation
Marked cards are cards that have been illegally altered so that their value can be read from the back. They give an unfair advantage to a cheater.
Marked cards are altered so that they can be read from the back.
They help a cheater.
Casinos change decks often.
Report marks to the floor.