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The AlphaGo team has stated that they no longer have the ability to make changes to the AI used for the match. The rules of the exhibition match prohibit that.

They maybe could have anyway, but it would be cheating: just the same as if they'd Mechanical Turk'ed it by e.g. having Ke Jie actually choose the moves to play.

Yesterday I kind of entertained the thought that they could have tried to make Alphago waste a move somewhere at the beginning of the game to give Sedol the equivalent of a stone advantage and see how Alphago could handle that. But it's clear that any move like that would have been immediately detected by the professionals who can read the game as I read the morning newspapers, so no.

I don't know why you're being down voted. The fact that the human won, makes it now so much more interesting! It surely is the best outcome possible both for human go players and Google as well (having won the first 3 already).

Nah, they let the european champion lose 5-0.

Incredibly unlikely.