There are more possible positions in Go than there are atoms in the universe.
It's all about probability and maths. As I said an intelligent computer makes faster calculations.
I checked the project. There are a lot of neurologists involved. Thing is Brain is an amazing organ and mystery. There are a lot of its secrets that humans haven't figured out. Without a complete understanding of brain's functionalities there won't be any algorithm or program for AI.
But Go is a game in which not only logic but intuition is used as well. When some world champions were asked why they made a particular move, they said that it just felt right. The same was done in many cases by Alpha Go, making very unorthodox moves.
Ask the AI if it did a move because of intuition. For real.