Gerald Kosky created a devilish, and still underused, method of switching one card for another, the card seemingly held securely, sandwiched between two face-up cards. According to Roberto Giobbi's Card College, the switch was originally published about 1940 by Joe Berg as "Kosky's Invisible Card Exchange."
To get a feeling for the switch at its most bare-bones use, take out the two black Kings, lay them face-up on the table, then place any card face-down between them. Get a break under the top card and you're ready to proceed.
a) Place the sandwich on top of the deck, then pick up to the break with the right hand in Biddle position. Pull the top faceup King onto the top of the deck, outjogged for half its length. Then pull the face-down card on top, square with the deck. Finally lay the last King (with a hidden card beneath) on top, injogged for half its length (Fig.1).
b) The right hand can pull up the front of the face-down card to display it once more, if desired. The right hand then grips the injogged card(s) with fingers on top, thumb beneath, and pushes it (them) forward until they coincide with the outjogged King (Fig.2). Shift the right hand to grasp the sandwich at the front and pull it from the deck, immediately fanning so a face-down card is still seen between the two face-up Kings (Fig.3).
Just that easily, you've switched the face-down card in the middle for another card.
But there any many possible variants on this technique, several of which we'll explain in the effects that follow.
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