Another interesting aspect is that AlphaGo gets a larger advantage over human players if it plays novel moves and forces rare situations that the human players

Another interesting aspect is that AlphaGo gets a larger advantage over human players if it plays novel moves and forces rare situations that the human players are not familiar with. So if AlphaGo is allowed to self-play a long time and "drift away" in strategy space from human games that could help a lot. This is even more the case in time-limited matches where the humans are forced to play intuitively in out of sample states.