Social Sciences

How To Predict Every Tic Tac Toe Move, Every Time

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Is it really possible to predict every move of tic tac toe before it even starts? According to mathematics legend Martin Gardner, it is—and it's really simple. Watch the video below to find out how.


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Predict Every Tic Tac Toe Move Before It's Made

You just need to remember three three-letter words.

Martin Gardner's Hexatetraflexagon

To honor Gardner after his death, James Grime created a psychic toy.

Another Martin Gardner Card Trick

You just need a deck of cards to try this trick out at home.

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Key Facts In This Video

  1. Watch a mathematical card trick that requires 27 cards and no sleight of hand: 00:26

  2. If you deal 27 cards in three piles three times, they will always end up in this arrangement: 04:07

  3. A ternary number system uses the digits 0, 1, and 2. 07:27