I found this game on Go Base. Kajiwara played the attachment at , but White, being Ishida, did not make heavy shape. ;-)
Thanks for the pointer. Apparently, the book 九段的感觉 (ISBN: 7-5009-1090-8) is unreliable here.
Note that and both have nearby supporting stones! As in the san-ren-sei example above, is the attacking stone. is an attempt to make white heavy.
I'm sure I'm missing a ton of subtleties with -- but can one of you verify that this is a valid way of thinking of (at least for the target audience of this page)?
Aside from being a 9 dan, Kajiwara is an original thinker. I hesitate to guess what he was thinking about.
But since you ask, . . . ;-) If he plays , the stone blocks the natural development of the corner enclosure. Also, if White runs out, Black may have to worry about an invasion at a. Maybe Kajiwara expected something like what happened, to trade the corner for thickness and sente. He did win, after all.
Thanks, I changed the text to the more neutral, "As in the san-ren-sei example above, is preventing white from making a base in that direction." That much seems to be objectively true. :)