Tic-Tac-Toe Puzzle to not lose

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Two players are playing Tic-Tac-Toe. (known as O and X game)

Player 1- Placed ‘X‘  in one of the corners.
No ‘O’ has been placed yet.

Where should the player 2 put his first ‘O‘ so that ‘X’ doesn’t win?

tictactoe-puzzle

[EXPLAIN THE ANSWER]

Assume- Both players are very intelligent

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  • 2 Answer(s)

    At the center.
    Since both players are smart,  it’ll be a draw,i.e., player 1 won’t win.
    Anywhere else, player 1 can(will) give a double attack, no matter what player 2’s second move is.

    GeNiUs Genius Answered on 6th October 2015.
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    Answer – “O” must be placed in the center.

    EXPLANATION-
    Let’s number the positions as:
    1 | 2 | 3
    ———
    4 | 5 | 6
    ———
    7 | 8 | 9

    It is given that “X” is placed in one of the corner position. Let’s assume that its at
    position 1.

    Now, let’s take each position one by one.

    • If “O” is placed in position 2, “X” can always win by choosing position 4, 5 or 7
    • If “O” is placed in position 3, “X” can always win by choosing position 4, 7 or 9
    • If “O” is placed in position 4, “X” can always win by choosing position 2, 3 or 5
    • If “O” is placed in position 6, “X” can always win by choosing position 3, 5 or 7
    • If “O” is placed in position 7, “X” can always win by choosing position 2, 3 or 9
    • If “O” is placed in position 8, “X” can always win by choosing position 3, 5 or 7
    • If “O” is placed in position 9, “X” can always win by choosing position 3, or 7

    So, By placing “O” at the center i.e. 5 by player 2, Player 1 can never win

    Detective Expert Answered on 7th October 2015.
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