Google's Go triumph is a milestone for artificial intelligence research

Go is not just any board game. It's more than 2,000 years old and is played by more than 60m people across the world – including a thousand professionals. Creating a superhuman computer Go player able to beat these top pros has been one of the most challenging targets of AI research for decades...
http://phys.org/news/2016-01-google-triumph-milestone-artificial-intelligence.html