The Ear Reddening Move was clearly very good. It is legendary because of the story about it, the notability of the players, and because of the nature of the game in which it was played. There were several games between Shusaku and Gennan at that time and this game was the second.
Everything about the game makes for a great story. You have the 17 year old Shusaku, an up and coming player, against a 50 year old Gennan who his the head of his Go house. For Shusaku to even be able to play Gennan was special, and Gennan obviously assumed he would win, so the first game was a two stone handicap game where Shusaku took black. However, Gennan stopped that game when it became clear that Shusaku did not need the handicap. So the next game was started without a handicap and you are ready for a classic David vs. Goliath tale. The story of the other go experts discussing the game with the doctor just adds to the thrill and, of course, Shusaku had to win in the end to make the story complete.
The concept of a "divine move" is more in the context of playing a perfect move in a perfect or nearly perfect game. It can't be a move that exploits some kind of obvious flaw in your opponent's play. For that reason it is hard for a divine move to be an obvious move.
While the Ear Reddening Move is a nice candidate for being a divine move, it can't really be called one. For a move to be a divine move it must be the
best move. In the book "Invincible" professionals give additional moves that black could have played instead of the Ear Reddening Move and the results shown are not unfavorable for black. By its nature a divine move would, in hindsight, become the only move. There would be no question of "how could black play differently?" because any other move would lead to a worse result.
As Oren said, any top level professional could find this move.
Maybe some strong amateurs could. But the thing I like best about this move is how it seems to exemplify Shusaku's style of play. The move has many similarities to the other move Shusaku is famous for: his diagonal.
$$Bc The ear-reddening move
$$ ---------------------------------------
$$ | . . . . . . . . . X O O . . . . . . . |
$$ | . . . X . . . . . X O . O . O O X . . |
$$ | . . O O . X . . O X X O O . O X . . . |
$$ | . . . , . . . . . , . X X X . , X . . |
$$ | . . . . . X . . . . X . . . . X X . . |
$$ | . . O . . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . O O O X X X |
$$ | . . . . . . . . . . . . . . X O O O X |
$$ | . . . . . . . . . 1 . . X O O X X X . |
$$ | . . . , . . . . . , . . O O X , X O . |
$$ | . . O . . . . . . . . . . . O X X O . |
$$ | . . . . . . . . . . . . . . O X O X . |
$$ | . . . . . . . . . . . . O . O X O O . |
$$ | . . O . . . . . . X . X O . O X . . . |
$$ | . . . . . . X . O . . X O X O X O . . |
$$ | . . X , X . . X . , . X O O X O O . . |
$$ | . . . . . X O X O . O O X X X X O O . |
$$ | . . . . . . X O . O O . O X X . X O . |
$$ | . . . . . . . . O . . O . X . X . X . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$Bc The ear-reddening move
$$ ---------------------------------------
$$ | . . . . . . . . . X O O . . . . . . . |
$$ | . . . X . . . . . X O . O . O O X . . |
$$ | . . O O . X . . O X X O O . O X . . . |
$$ | . . . , . . . . . , . X X X . , X . . |
$$ | . . . . . X . . . . X . . . . X X . . |
$$ | . . O . . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . O O O X X X |
$$ | . . . . . . . . . . . . . . X O O O X |
$$ | . . . . . . . . . 1 . . X O O X X X . |
$$ | . . . , . . . . . , . . O O X , X O . |
$$ | . . O . . . . . . . . . . . O X X O . |
$$ | . . . . . . . . . . . . . . O X O X . |
$$ | . . . . . . . . . . . . O . O X O O . |
$$ | . . O . . . . . . X . X O . O X . . . |
$$ | . . . . . . X . O . . X O X O X O . . |
$$ | . . X , X . . X . , . X O O X O O . . |
$$ | . . . . . X O X O . O O X X X X O O . |
$$ | . . . . . . X O . O O . O X X . X O . |
$$ | . . . . . . . . O . . O . X . X . X . |
$$ ---------------------------------------[/go]
$$Bc The Shusaku Diagonal
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . O . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$Bc The Shusaku Diagonal
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . O . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . 1 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . X , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Both of these moves are good moves, yes, but they are not good because they are forceful moves. Instead, they both do a lot of little things that take the entire board into account. Shusaku's moves tend to be calm without being timid. He seemed to prefer to defend before attacking. To build for himself before destroying his opponent's position. That is why I like to look at his games. He always seems to be thinking globally with his moves, yet he doesn't force anything to happen until he is prepared.
I think there are a lot of things to like about the Ear Reddening Move, even without the story. It is a move that, were I to see it in a professional game, I would take a moment to study and probably be awed by the ingenuity of the professional. No weak player could find this move. And the move is, without a doubt, a perfect example of whole-board thinking.