zinger: Black can kill white's group with a, so white needs to live. Playing at a works, but does nothing else. also lives, and is a point or two better. But is even better, as it threatens to make a second eye by descending to . If now , white lives with . This is an example of force before defending.
Velobici: makes life of the enclosed white stones. Locally follows, lest white gain more by playing at the location of . In the game, other moves on the board were more important than , so it is possible that white will get to play at .
The position is discussed in the 53rd issue of The Magic of Go
Dave: However, I think this is not what Kobayashi played, right?
As noted there were various tenuki played but finally after White pushed at and connected at .
Bill: Thanks, Dave!
And Kobayashi was, OC, right. As the diagram suggests, Black had territory on both sides. - saves one point by comparison with the suggested solution.