The viewer makes the first move. When it’s the AI’s turn, the computer sketches out possible moves (often several steps in the future) on the screen before it makes its decision. Orange curves represent the computer’s possible moves, green ones are moves the viewer could make, with the brighter lines being the best moves.
It’s no quantum chess, and most viewers are nowhere near being chess champions much less beating AI at a game like Go, but it provides a rare glimpse into the methods of the machine. [Bewitched, Flowing Data]