World's top Go player faces Google AI

Google's artificial intelligence wing hopes to make history over the coming days.

It has challenged the world's top-ranked Go player to a set of matches running until March 15 to see whether man or machine comes out on top.

The tech firm's AlphaGo software has already beaten the European champion of the board game, but South Korea's Lee Se-dol should prove a tougher challenge, as BBC's Stephen Evans discovered.