Tic Tac Toe Challenge 377
X and O are playing game of tic tac toe on this weird board with normal rules.
It is now X's turn. Where must X place the mark to Win the Match?
Enter your answer as sum of all those places. For example: if your answer is 1 or 7, then enter 1+7 = 8.
Assume that both are playing optimally.
The answer is 9.
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1 solution
x must go in a place that forces o's move to ensure a win, therefore it must threaten a 3 in a row. This can be done by playing in 2, 3, 4 or 5. With 2 and 3, o is forced to play a move that forces x's go and stops x from getting three in a row. For 4 and 5, o is forced to play in 3 and 2 respectively and x can then win by playing either 2
or 3 respectively. This threatens a win in two different ways so forces a win.