Does the player who goes first have a secret edge?

1Two things to know first

"Perfect play" and "a slip"

You need two small ideas. Watch each one happen:

Perfect play

A player who never makes a mistake always blocks your three-in-a-row and grabs every winning spot. A computer can do this every single game.

A slip

A slip is one bad move — leaving a spot open that lets the other player line up three. Real people slip sometimes. Perfect players never do.

2It depends on the other player

Same first move — two very different games

Both play perfectly 🤖

Neither one ever slips. Every threat gets blocked. Keep this case in mind…

The other player slips 🙋

X plays well, but O leaves a spot open. Now does X's head start turn into a win? That's the test.

3Watch one game

Make O sloppy, then play it out

Here's one game: X plays smart, O's care is up to you. Set how careful O is, then hit play and watch the board fill in. Does X punch through, or does O hold the tie?

How careful is O: careful

NEVER SLIPSSLOPPY

Set O's care, then play.

4Now predict the big test

Let the computer play BOTH sides, perfectly, thousands of times 🤖🤖

One game is luck. So we'll race thousands of games with both players perfect — and tally every result into three bars: X wins, draws, O wins.

Guess before you run it

If BOTH players play their very best, who wins tic-tac-toe?

In tic-tac-toe, does the player who goes first have a secret edge?