While I can understand Lee Se-dol's frustration, I think there are better lessons to learn from Kasparov's acceptance after the Deep Blue vs Kasparov matches. Cyborg chess is the future of chess. Period. Chess players use computers to train themselves and explore openings in human-only settings, while programmers / cyborgs play correspondence chess. Go is not finished as a game. A new tool, MCTS + Neural nets, has be…
So there was a window between the 90's and today where a human player could have discarded the traditional measuring sticks of "trade-value" and beaten DeepBlue.
Maybe that's not true today or maybe there's a further theory out there?