Retrieved 15 September 2019.
Place your second X in the opposite corner from your first, so there's a line going "X O X" diagonally across the board.
exe and TicTacToe 2.
Patashnik, Oren 1 September 1980.
Retrieved 17 December 2016.
If they continue to play correctly, they can guarantee a tie.
for tic-tac-toe The game can be generalized to an , in which two players alternate placing stones of their own color on an m-by- n board with the goal of getting k of their own color in a row.