Play by Play
Game 2, Move 37—AlphaGo is playing black
The Korean expert commentators are taken aback—the move is "totally unthinkable”
The American Go master commentator is also confused, and wonders if AlphaGo has made an error 
The Google team of engineers who programmed and trained AlphaGo are also puzzled 
Contemplating Move 37, world champion Lee Sedol is visibly stressed and confused
Lee Sedol normally takes about a minute to make a move, but needs twelve minutes to respond to Move 37 
Go master Fan Hui, an AlphaGo consultant, was also confused by Move 37, but soon realized its beauty and significance 
Lee Sedol discussing how he was left "speechless" by AlphaGo's performance in Game 2 
