Note: at this point you finish the trick in one of two ways depending upon if there’s an even or odd number of cards left.
a) if there’s an even number of cards, get the spectator to deal them out into pairs. Then continue the elimination until you have just one pair of cards left. You choose the last card to be eliminated being sure it’s not your memorised card which you then turn over.
b) if there’s an odd number of cards left and your memorised card is the bottom card, deal them out into two piles and finish by turning over the top card. If it’s odd and is indeed your memorised card, ask the spectator to deal into pairs. Then put the bottom card to one side and continue as for the even number of cards above in a).
When you’ve turned over your memorised card, you then bring back the other deck which you put to one side at the beginning of the trick. Being sure to remember which card was on top and which on the bottom, you turn whichever one matches. Both cards are identical!