How About a Nice Game of Chess?
March 4, 2011 11 Comments
In spite of, or perhaps because of, Matthew Broderick thinking that yelling “Learn!” at a computer will actually make it do so, WarGames is a pretty fantastic movie. Released in 1983, the science-fiction film tells the story of David Lightman, a computer hacker played by Broderick, who accidentally finds his way into a military supercomputer programmed to predict outcomes of nuclear war. Lightman gets the computer to run a nuclear war simulation, which causes an international nuclear missile scare and almost single-handedly starts World War III.
The most famous scene from the movie comes towards the end. The computer, WOPR, finds the missile launch code it’s been searching for. Before launching the missile, it runs through all of the nuclear war scenarios that it has created. Predictably, WOPR finds that all scenarios yield pretty terrifying outcomes for all parties involved. WOPR concludes, famously,
“A strange game.
The only winning move is
not to play.How about a nice game of chess?”
Aside from WOPR achieving sentience, it also figured out that, from a game theoretical perspective, choosing to strike your opponent in a game of Mutually Assured Destruction doesn’t yield a positive outcome for either party.
This is pretty good news for proponents of the Singularity. Singularitarians fear that, if or when machines achieve consciousness, machines might end up destroying humanity as we know it. In the WarGames scenario, WOPR achieves sentience and decides on peace.
So how does a Mutually Assured Destruction game work?
Take a look at the figure above. In this situation, both America and the Soviet Union have the option to fire their weapons. However, if either one does, it doesn’t matter what the other side does, because one weapon launch will destroy both sides. Hence, mutually assured destruction.
Note that the Soviet Union’s nodes are circled. This particular form of the game assumes that both players are making their decision simultaneously, without knowledge of the other player’s choice.
The best outcome is for both sides to back off. Or, as WOPR finds, for both sides not to play.
Whenever anyone asks about mutually assured destruction, the example of the Cold War inevitably, and understandably, comes up. Are there any games of Mutually Assured Destruction being played right now? What other examples, non- war related, are there of mutually assured destruction?


