Lee Sedol fights back in the match against AlphaGo

Although the match is already won by AlphaGo, the remaining games are played to the full. Lee Sedol won game 4 holding white thanks to a brilliant move in a difficult middle game. This move was even qualified as "god move" by Gu Li, 9p.

This win is quite important from a symbolic point of view. It also exposes some weaknesses of AlphaGo that were invisible so far.

Game 5 will be held on Tuesday 15 March. It has been agreed that Lee Sedol will hold black.