It’s rather simple if you have the first move. Put your mark in one corner and depending on your opponent’s next move, put your mark on another corner and you’ll be perfectly set up for a win.
It doesn't take long after learning to play Tic-Tac-Toe to realize that once you've mastered the basic tactics, your games will end in an infinite run of ties. But Pressman Toy has done the impossible and made Tic-Tac-Toe actually sound interesting again by upping the challenge with the introduction of a third…
The good news is that with this chart of optimal Tic-Tac-Toe moves, you'll never lose another match. The bad news is that this would've made War Games a whole lot less suspenseful.
It's tough to find a partner who's always ready and willing to play, so James Bridle attempted to build one. 304 matchboxes and several bags of beans later he had MENACE, a Tic-Tac-Toe playing "machine" designed to learn and improve.