> Alpha-Go doesn't seem to implement much randomness at all into the moves it plays. The source of randomness is in time-controls (AlphaGo may choose MoveX before 30 seconds of analysis, or MoveY after 30 seconds of analysis), but this is a fairly constrained number of moves.

The basis of reinforcement learning algorithms is the exploratory nature of learning due to the initial application of largely random moves.

Only after some time the agent is given confidence into his learned ability and grafually moved into a more deterministic behaviour mode.

This is the exact opposite of your statement. Star Craft players have noted that the fleet of different AlphaStar instances training in ensemble observed very different behaviour due to this property of RL.