A system includes a card shoe that includes a housing for housing cards and an opening through which the housed cards can be drawn. The system includes a computer to detect whether there is any of the following predefined arrangements: (1) for each of a predefined number of consecutively drawn cards, the respective rank of the respective card is larger or smaller by one than an immediately preceding one of the cards drawn from the card housing; (2) a respective rank of each of a predefined number of consecutively drawn cards is the same; (3) a respective suit of each of a predefined number of consecutively drawn cards is the same; or (4) a same sequence in which a predefined number of the cards are consecutively drawn is repeated.