Twenty One Card Trick
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The Twenty One Card Trick is a magic effect in which the magician deals twenty one cards onto the table, into three face up piles of seven cards each, and asks the spectator to think of any of the cards shown. The spectator is not supposed to tell the magician which card is being thought of, but tells the magician which pile the card is in. This is done three times, and the magician is able to tell the spectator which card they were thinking of.
The cards are dealt into the piles one at a time, like when dealing out hands in a card game. Each time they are dealt out, after the spectator indicates which pile contains the thought of card, the magician places that pile between the other two. After the first time, the card will be one of the ones in position 8-14.
When the cards are dealt out the second time, the selection will be the third, fourth, or fifth card in the pile it ends up in. In picking up the piles, the magician places this pile between the other two again. This ensures that the selection will now be one of the ones in position 10-12.
The third time the cards are dealt out, the selection will be the fourth card in which ever pile it ends up in. On the third deal, as soon as the spectator indicates which pile contains the selection, the magician knows that it is the fourth, or middle, card in that pile. If the magician gathers up the piles again, as before with the pile containing the selection in the middle, the selection will be the eleventh card in the 21 card packet.
[edit] Literature
- Professor Hoffmann, Modern Magic ISBN 0-486-23623-4
