Since alphago plays the game differently (optimizing on odds to win, even if by a little, instead of the human method which involves intuition about shapes), it may be that its explanation if it were programmed to provide one would not provide any human readable 'insight' which an expert could then take to improve his or her game. Imagine a simpler example, some optimization solution using multiple dimensions and linear algebra. A description of how this works would be unreadable to most people. Since most readable language operates in the world of at most four dimensions without introducing jargon, this is the real problem, not that the program cannot explain itself.