'Tic-tac-toe' or 'cross & noughts'

Logic Level 2

The two amateur people played a game of Tic Tac Toe. Each of them places his/her mark, either \( \color{red} X\) or \( \color{blue}O\). We do not know who starts first.

After the first player has placed his/her second mark, the players will always place his or her mark in a line that already contains
(a) two of his/her own marks.
(b) two of his/her opponent's marks.
(c) giving priority to (a) over (b).

Only the last mark to placed in the game shown in the figure above has not been given. Who will win the game: \( \color{red} X\) or \( \color{blue}O\)?


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