Tic-Tac-Toe classic 3x3

Tic-tac-toe (or Noughts and crosses, Xs and Os) is a pencil-and-paper game for two players, X and O, who take turns marking the spaces in a 3x3 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game. Players soon discover that best play from both parties leads to a draw (often referred to as cat or cat's game). The friendliness o…