By 'watching' how humans play the game, researchers hope to be able to improve their own computer programs.

The humans played with the animal for an hour.

This leads to a philosophical question: What role do humans play in the planet's evolution?

In the case of the dodos, humans played a major role.

When that happens, will anyone want to watch humans play chess?

Of which humans play an important part by being hosts.

And in the case of nitrogen, the experts say, humans are playing an unmistakably large role.

The question arises partly because of the very different ways that humans and computers play chess.

The time is a few years into the future, when robots allow humans to play at war vicariously.

So the humans can play with them as long as they want.