10 What are the simple mind-reading magic poker cards?

The operation of playing card mind reading;

Props: A deck of 52 standard playing cards (excluding trump cards).

Performers: 3 people (1 audience, magicians A and B).

Performance process:

First, let the audience shuffle cards at will and draw 5 cards for A; Then, A puts four cards (winning number) and 1 card (dark card) on the table, and then B participates (before B can't be nearby); Finally, B looked at four cards and told the audience the color and number of dark cards after thinking. For example, after seeing the following four famous brands, B reported that the secret card was plum blossom Q, which was verified to be correct.

Extended data

The principle of poker mind reading;

Dark cards have two messages: color and number of points. A needs to encode the above two pieces of information with four cards, and then B decodes the information to get the color and points of the dark cards.

According to the pigeon coop principle, at least two of the five cards are of the same suit, so A can designate a card of the same suit as a dark card, code it with the position of the card of the same suit in the winning number, and transmit the information to B. The determination of the number of dark cards needs to use the other three bright cards and the number of bright cards used to specify the dark card, which is the difficulty of the problem. In order to solve this difficulty, 52 cards are sorted first, and then their points are determined by congruence theory.