I'm a very weak go player, playing very occasionally. I however enjoy easy tsumego problems on the train on my phone, as I find it more fun than, say, crosswords or sudoku.
However, the app I use (Tsumego Pro) presented me with this problem, and gave me a "complete" mark on a solution I don't think will work. The hints in the program point to this "solution".
As far as I can tell, black is dead and white is fine despite this. In every scenario I play out myself, white is able to kill the black inside the formation and be fine. Is this really the solution? If so, what am I missing? If not, what is?
My apologies if I have screwed up tags, formatting or the question itself, I'm not a regular poster here :)