In March 2016, amid the second game of the historic man-machine showdown at the Four Seasons Hotel Seoul, AlphaGo made a move that would echo through the annals of Go history—it placed a black stone on the fifth line of the board. This audacious play rendered the on-site commentators momentarily speechless, with whispers of a program glitch even circulating among them. To seasoned professional Go players, such a move seemed tantamount to a voluntary resignation, a puzzling departure from conventional strategy.
