$$\def\S#1{\phantom{\Space{18px}{22px}{0px}}\llap{#1}} \begin{array}{|c|c|c|c|c|}\hline \S{}&\S{}&\S{}&\S{}&\S{}\\\hline \S{}&&&&\\\hline \S{}&&X&O&X\\\hline \S{}&X&O&O&\\\hline \S{}&&X&O&\\\hline\end{array}$$
$X$ to play and win.
The rules of Teeko:
- Teeko is played by two players, black and red, on a five-by-five checkerboard. Each side has four checkers in his color. (In this puzzle, I rendered black as $X$ and red as $O$.) The coloration of the board has no bearing on the game.
- The first four moves per side are played by the player's placing one of his checkers (that's not yet on the board) on any empty square on the board.
- Every subsequent move is played by a player's moving one of his own checkers from its own square to any adjacent empty square. Adjacency is horizontal, vertical, or diagonal.
- The first player to have all four of his checkers form a box (two adjacent squares in a row and two more immediately below them) or a line (horizontally, vertically or diagonally with no gap) wins.
- There are additional rules to prevent indefinitely repeated moves and to prevent a piece from being rendered immovable for too long, but those don't come into play in this puzzle.
Credit: The idea of this puzzle comes from John Scarne's book Scarne on Teeko.