tderz: I could imagine to .
White a , Black b follow,
whereupon Black c and d are miai.
If White thinks of hane e during these exchanges,
Black retreats safely with f or connects at b sooner,
as he always has the peep g.
I think White cannot get life there.
(Have to admit that I consider it a negligence
that at least trying such sequences did not occur to me during the game)
kb: Try another - I think yours is not devious enough... White can get something... ...Oh - I forgot to include the row just above the top row. Makes a big difference. I added it to both diagrams.
tderz: kb, it seems to dawn on me .... (Germanism)
is a possibility, if black a then cut b gives aji c or extension d.
Notwithstanding that aji c might not work for White,
I'll continune with blocking hane d for the moment.
tderz: is very careful (cooncerning only the lower side),
let's assume its necessity for the moment ...
yet it could be played at c.
Now even after an exchange m-n, the points p, q are miai and White would live.
However , it depends on the right premises,
i.e. was necessary and had it to be played there?
I think that was your idea.
tderz: prepares the stone-tower tesuji. cannot be caught.
White seems dead