Borrowing a red and blue backed deck, the performer apparently forces the spectator to take a card, the duplicate of which the performer has already picked. In short, the magician apparently knows exactly which card the spectator will choose.
Hand one deck to be shuffled. Take it back and the other is handed out at the same time. Hold the deck returned in the right hand, thumb at one end and fingers at the other with the deck facing palm. Take the second deck back face up in your left hand. Make a slight right turn as you tap the long edge of the right hand deck on the face of the left deck, and at this time the left fingers make a slip, bringing off the face card of the right pack onto the face of the left pack. The left hand pack is at once turned face down in the left hand as the performer asks which deck shall be used.
No matter what the selection may be, the right hand deck is spread face down on the table or floor from right to left. Turning the left hand deck with faces towards yourself, run through them to find a card. At first you notice the card on the face of the deck (the added card from the other deck) and in running through you look for the duplicate of this card. The cards are being fanned very slightly from left to right and when the duplicate is found, the left and right thumbs behind the deck slide the face card to left and on top of the found duplicate. The right hand now cuts the portion of the deck in front of these two to the back of the deck. From the front it appears as though you ran through until you found a card and then merely cut the deck, bringing it to the face.
The face card towards the performer is now the card of opposite coloured back and, under it, is the duplicate from the deck in your hand. The right thumb lifts the two cards at bottom and pushes them up about an inch together. The left hand turns the deck downward, and these two cards are taken between the thumb and second finger of the right hand, the left hand placing the deck on the table face up.
The two cards are handled as one and kept always with back to the audience. They are now held in the left hand, fingers along the lower long edge and thumb on the opposite side (upper). The forefinger is at the end.
The spectator is now asked to push forward on the table or floor any one of the 52 cards he may want to select. You pick it up without showing and put it with its back still outward in the left hand between fingers but pulled back about an inch so that neither card is ever out of sight for a second. The left first finger now presses against the back of the set of two at the outer end. The right second finger presses down on the two differently coloured backs in front where they overlap so that they may be pushed forward together and the right thumb is overlapping the bottom of the second card in front, to act as a stop.
As you ask the spectator to tell which is his card and which is yours, an easy push forward is made and the back card of the two slides backwards and lines up with the second card picked up. Never do the two front cards leave the sight of the audience for an instant.
Calling attention that it is your card which was picked first, you pull out the forward card and show it, laying it on the face up deck. Now, holding the two cards in hand as one, they are turned and shown as one, and the audience sees the duplicate of the card first shown! Still holding the two as one, they are held face down in the right hand with fingers at one end and thumb at the other. Starting at the right end of the deck before you on the table, the cards are all scooped along to the left and, after squaring, are turned face up.
The two face cards now match and the two decks may be looked over as there is nothing to find.