DietersStudyWithAIIn2024/Exercise15hint

Moves 24 to 29  

If you are like me, then a and b come to mind. a is building a sphere of influence while reducing Black's. b is harassing Black's weakest group, while reinforcing the corner territory. I chose b.

According to KataGo, both are mistakes, ignoring the really important area. Upon review I was at first surprised but then I understood how I'm misled by superficial aspects (shape) when evaluating the deeper aspects (strength) of groups.

So, where would you play now? What's a surprisingly important move?