Consider the following game, called Tic. It appears in the text by DeVos and Kent $($referenced in the PUB Notes$).$ This game is similar to Tic$-$Tac$-$Toe, but is played on a $1$x$3$ board instead. Here's the board before the start of the game:

$[||]$

The vertical line separates the board into $3$ empty squares to be filled in by the alter$-$ native moves taken by our players.

There are two players: Player $1$ and Player $2.$ The first player has the first move and then they alternate turns. Player $1$ marks an empty square with an X and Player $2$ marks an empty square by the letter O$.$ Here's one possible opening move by Player $1$:

$[||$x$].$