Visual Brainstorms ®

06, Dec 2017

Our riddle from our monthly Chu On This… Newsletter

A Special Tic Tac Toe:  In Arnold’s Tic Tac Toe, three in a row loses!  You are playing the “O” ‘s and it is your turn.  What move can you make to force Arnold to end up with three “X” ‘s in a row, so he loses?

Answer:  You should place your “O” in the bottom left hand corner.  Any other choice will end in a tie.

Here’s how:  Shown below are all Arnold’s move options.  No matter how he plays to counter your skillful move, he will lose.

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