This was the first game between Kitani 9 dan and Go Seigen after the WWII. It was Go Seigen’s first game against Kitani Minoru after 13 years of gap. It was played in Tokyo Chiyoda District Kioi Street’s Fukudake Inn on April 14-15, 1957.
I have a question about move #13 by black when Go Seigen comments: “B #13 of course.” and nothing else. Why this move is so obvious and better than other moves?
Imagine a white stone there and you’ll begin to see the horror. As for why Black’s move is better than others, attaching at P16 is possible, but that prepares to attack only one way (downward), and in that sense it’s less flexible than the diagonal move, which has follow ups in both directions. This is why it’s considered a kind of reactionary move. If your opponent pincers that way, you can often play the diagonal move without thinking.
Well, yes and no. Certainly it prevents white from winning a lot of influence, but it also moves into the center and prepares to attack in either direction. This doesn’t immediately grant territory to Black, but that doesn’t mean there’s no benefit to Black. The attack is worth something. It would be a mistake to count the value of attacking (or just leaning, building influence) as 0 points, you know? I can provide continuations if it would help, but maybe it’s good enough to just see what happened in the actual game!