This game was largely played extremely well by both sides. There were a a few peculiar-seeming moves made by AlphaGo that the commentator found very atypical. These moves ended up playing a very important role in the end game. I should also say that it's somewhat clear that Sedol made one suboptimal move, and AlphaGo capitalized on it. Interestingly, the English commentator made the same mistake as he was predicting…
Myungwan Kim 9-dan professional (comments on match #1): "She knows everything [...] Unthinkable move for human [...] AlphaGo plays like the god of go"