Lee Sedol beats AlphaGo in game 4 (result is now 1-3)

Discussion happening here: https://news.ycombinator.com/item?id=11276798

Someone tell Lee Sedol to ask for a match extension so it's not 3-2 if he wins, and if he somehow wins the next match after this, and wins the match extension he will reclaim his lost glory, then he needs to retire asap.

He seems to have made tactical improvements to his game so it's not too much of a longshot.