Ring for tricksters
Today, hardly any of gamblers use the ring for cheating in the game. This was true in the past century. Nevertheless, you need to know about it. This ring is made in a special way: the empty space inside it is a tank with light ink. Ink out through the hole in the figure shown below in the form of needles. Since the hole is very thin, the ink can be held freely in the ring.
In a favorable time for yourself sharpie can designate some cards imperceptible dots, with the eyes of the opponent.
These points can be denoted as the value of the card and the suit.
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