Tic-Tac-Toe is a two-player game played on a 3X3 grid
where players alternate placing 'X' or 'O' in an empty
space in the grid. The first player to lineup three marks
in a row, column, or diagonal wins. X goes first,
players alternate turns, and only one player can have
a winning line (or no one). If a player has won, the game
ends immediately, and no more moves can be made.

considering players
  3x3 = 9
      X has 5 moves.
      O has 4 moves.