Cade Metz in Wired: (link is to, due to Wired’s invasive advertising)

After more than four hours of tight play and a rapid-fire endgame, Google’s artificially intelligent Go-playing computer system has won a second contest against grandmaster Lee Sedol, taking a two-games-to-none lead in their historic best-of-five match in downtown Seoul.

This is extremely surprising, as as of a year ago, an high-average amateur player could beat any computer at go. Then 6 months ago, Google’s program beat a 2-dan pro, which was a shock to everyone, and now it seems to be handling a 9-dan pro, which is the top level of go ranking.