@Bill Spight
With respect to the game move at 112, I see your point. It's kind of a small-scale double-open skirt, so there is less value in trying to close the bottom. I guess I didn't see it that way in the game. I was doing more of a local pattern matching.
My failure to see C11 is, I think, psychological. I had previously decided (even before move 54) that the C9 and D9 stones were light and could be sacrificed, so I reminded myself for the next few moves after that not to try to defend them. Now, of course, the game changes and the circumstances change, and by the endgame I guess they become useful in a different way. So I need to be sharper in the endgame but also be willing to discard my previous evaluations. I had considered L4 for White 112, but not K5. That's clever to have the ladder breaker follow-up!
I think there is also kind a "weak player's consensus" going on, where a vital point is missed by both players because they each trust each other that it doesn't work, even if it does.
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Calvin Clark
when 'a' was still possible. Still, there are lessons to be learned in not getting into this bad situation to begin with.