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If he had made a dumb move and AlphaGo capitalized on it we would be talking about how the AI goaded him into a sense of safety.

If he had made a dumb move in response then we would be talking about how he made a really really dumb move, that even an amateur could have seen.

The moves made by AlphaGo there were very bad.

If the situation was unwinnable then in a certain sense all moves are equally bad.