It didn't look like a Takemiya-style move to me. Takemiya tends to play for a huge moyo in the center. AlphaGo had no such moyo. It wasn't only a strange move; it was also a strange time to play it, and it definitely went against conventional wisdom.
The result of the shoulder hit coordinated with black's bottom formation, and the extension on the 4th line that threatened to cut white's stones off was flexible and could have easily formed an impressive moyo on the bottom. It did not play out that way, but I think that black's strategy was as cosmic as anything Takemiya might have played. His games did not always end with a giant moyo, he was also very flexible. I hope to see written reactions from professional players, and maybe Takemiya will give AlphaGo's style his endorsement :)
Some examples of 5th line early shoulder hits in recent professional play - these situations are not the same as the one seen in today's game, but something like a 5th line shoulder hit is always going to be highly contextual and creative.
Those games are really interesting. In the first two, they are both ladder-breakers played by stronger players; my guess is the weaker players set up the ladders assuming that the stronger players wouldn't play a fifth line shoulder hit to break them, and the stronger player didn't back down. In the third game, the fifth line shoulder hits aren't that surprising; they're reductions against frameworks that were allowed to get big in exchange for growing an opposing framework; they're locally bad moves but the global benefits are clear; you'll note that both players play a fifth line shoulder hit.
The only one I can't parse is the last one. There are a lot of variations where I want to know what black's plan is.
