This game brings nostalgia for so many of us! Tic-tac-toe (American English), noughts and crosses (British English), or Xs and Os is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three of their marks in a horizontal, vertical, or diagonal row is the winner.

This is a companion discussion topic for the original entry at https://dphi.tech/practice/challenge/14