Hat & Hare

First 5 tricks · No. 1

The 21-Card Trick

A self-working classic. Deal three columns, ask three questions, and their card lands exactly where you need it.

Category
Cards
Level
Beginner
Learn it in
About 15 minutes
Difficulty

Draft. Awaiting review by our resident magician.

  • TODO: Verify the Gergonne credit and date before publishing
  • TODO: Review the patter in your own voice

The effect: what they see

Your friend thinks of one card among twenty-one dealt on the table. They never touch it or say its name. After three deals, you produce the exact card they were thinking of.

What you need

  • 21 playing cards, any 21
  • A table

The method

This trick works itself. Your job is to deal neatly, ask clearly, and pick up the piles in the right order.

  1. Deal 21 cards face up into three columns of seven, dealing across in rows: left, middle, right, left, middle, right, and so on.
  2. Ask your friend to think of any one card and tell you only which column it’s in.
  3. Gather each column into a pile. Pick up the piles with their column in the middle, sandwiched between the other two.
  4. Deal again exactly the same way, across in rows, into three columns. Ask which column their card is in now. Gather with that column in the middle.
  5. Do it a third time: deal, ask, gather with their column in the middle.
  6. Their card is now the 11th card from the top, every time.

Performance & patter

The danger with a self-working trick is that it feels like a procedure. Three deals is a lot of dealing. Give the repetition a reason.

Suggested patter: “I want to see if I can read you. Not your mind, your eyes. Every time I deal, your eyes go back to your card, and that tells me a little more.”

Now each deal is you “studying” them. Make a show of watching their face as you deal.

For the reveal, don’t just count to eleven out loud. That shows the method. Spell a phrase with exactly 11 letters instead, like “Show me magic” (S-H-O-W-M-E-M-A-G-I-C). Deal one card per letter and turn over the last one.

Common mistakes

  • Dealing in columns instead of rows. Always deal across, one card to each column in turn.
  • Putting their pile on top or bottom. It goes in the middle, every time.
  • Counting out loud to eleven. It gives away that the position is fixed. Spell something instead.
  • Doing it twice for the same people. The repetition is the weak point. Once is a mystery. Twice is a puzzle they’ll solve.

Where to learn more

Origin. Traditional and centuries old. Its mathematics was studied by the French mathematician Joseph Gergonne in the early 1800s.

  • Mark Wilson's Complete Course in Magic by Mark Wilson