blindgod,
blindgod wrote:I hadn't tried it before and wanted to give it a go.
Yes, very good to experiment -- and now you get some ideas on when it's OK to play it and when it's not.

blindgod wrote:However, in looking at the book again, there's two specifics in Otake's example which aren't in mine.
(1) There's another black stone near the star point, which limits white's extension. [My emphasis.]
(2) the original black stone is on the 3-4, not the 4-4 as in my game.
Good observations. (1) is important, and makes the big difference why the kick was in the book, like your own

.

(2) is less important.
blindgod wrote:white is heavy on the variation of move 40, what do you mean?
Good question. When a group of stones is too big to give up, but not easy to settle -- either to make eyes to live, or to run away easily --
we call it 'heavy', as in a burden for the owner to carry around, to take care of, to worry about.
When you have a heavy group, your opponent
may find ways to attack it, thereby profiting
from the attack. That's why the descend to R10 on

and again on

was very big --
B profits on the upper right while simultaneously making W heavy, for even more (potential) profit.