Basically my interpretation. The key piece missing in chess was how to know what positions were worth searching with a computer. A human had that intuition, an

Basically my interpretation. The key piece missing in chess was how to know what positions were worth searching with a computer. A human had that intuition, and so a 'centaur' could be better. But that hiccup was solved by AlphaGo, using the expectation neural network. About the only thing left for humans to do is deciding which problems to try to solve.