What is a poker nail?

Take an ordinary deck of poker, show it to the audience, let an audience draw one from it, and don't let yourself (the actor) see it. After the card drawer sees it clearly, he inserts the drawn cards back into the whole deck of poker. Immediately put away the cards, shuffle the cards several times, then turn around and walk to the table, take out a thumbtack from the thumbtack box and give it to the audience who has just drawn the cards. He will randomly put the thumbtack in the middle of this deck of poker to temporarily pick up the cards without breaking them. At that moment, I saw the actor holding all the playing cards in his right hand, approaching a board standing on the left side of the platform in advance and throwing it up hard. Bang, the cards fell one by one, but there was a poker nailed to the board, and its design idea was exactly the same as the one that the audience had just drawn.

When the audience pulled out the card to see the idea, the actor fanned out the lower part of the card and prepared to insert it back. At the moment of inserting the card, he quickly leans against the edge of the card with the middle finger of his right hand, and his hands will be completely closed immediately. At this point, there is a gap between the inserted card and the next adjacent card, because the middle finger of the right hand is stuck in the abdomen, so the left hand holds the card and pulls it several times with the right hand to pull it up. After shuffling, I still stay on it. When you turn to get a thumbtack, quickly take out a thumbtack that was put in the seam of your skirt in advance and stick a playing card on it from front to back. Because the tail of the thumbtack is very small and covered by the heart of the left hand, it is difficult for the audience to see the flaw. When throwing a card at the chessboard, the back of the card faces the chessboard.

This set of magic has some skills, which need to be practiced in advance to be handy when performing.