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You both speak of the day AlphaGo won 4/5 matches, yet the matches were played over a series of days. Which of those days was the switch flipped, then? For me there was a significance in day three, but it was mitigated somewhat by the (to me) surprise of day/match four.

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IIRC, it was day 3 for me as well, and I had the same (minor) let down on day 4 (resign?!?!). That said, I imagined the resignation was a fixable flaw in the AI, and this turned out to be correct.

I can’t actually remember where I first learned about the match. It may have been HN, it may have been in an AGA e-mail, or it may have been some tech-oriented magazine/web site in English or Japanese. I am certain it wasn’t match 1, because I reviewed earlier matches, and I remember the let down of match 4, so must have been match 2 or 3.

For me, day 3 was the stunner even though the writing was already on the wall.

Day 1 was a great surprise but I was still left wondering if it was a fluke. Day 2 showed that it was no fluke and I started to get a sinking feeling. I guessed that Lee Sedol would lose the third game and win the fourth after the pressure of the Korea and humanity was off him.

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