Global Thermonuclear War

In the 1983 film WarGames, an advanced supercomputer, WOPR, was placed in control of national missile defense systems. This computer was accessed by a young hacker who wanted to play games. David Lightman, the young hacker in question, was blind to what he had set in motion.

Unfortunately, he chose to play Global Thermonuclear War, which started a series of events nearly leading to a fictional World War III. The computer attempted to "play" by simulating an incoming attack to prompt the human personnel to launch a counter strike, and when that failed, began to crack the launch code (CPE 1704 TKS) to launch the missles itself.

To avert a nuclear disaster, the computer was eventually instructed to play Tic Tac Toe against itself. After hundreds or thousands of rounds, it finally learned that the game could have no winner. It then proceeded to play out a wide number of scenarios for Thermonuclear War, eventually determining that, truly, there is no winning move except not to play.

Machines can feel stacks of numbers.