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AlphaGo system won first game. Not a go player, but the commentary I've seen suggests it was quite close until the very end.
Hypothesis 1: The cluster plays to maximize odds of a win, not magnitude of a win, and is exploiting a class of close wins that humans have a hard time with. Expect sweeping near wins.
Hypothesis 2: The cluster and the champion are indeed evenly matched. Expect wins and losses. May imply that the game saturates at high levels of analysis, and that there is no such thing as a 'superhuman' go player because the best humans hit the point of diminishing returns.
*EDIT: evidence accumulating in favor of #1.
*EDIT2: final results suggest something between the two.
Perhaps (2) because the AlphaGo people wanted to have a match as soon as they put a high probability on them winning and they are accurately able to calculate their program's strength.