Pincer was bad in top left probably.
Trying to make a ponnuki also maybe bad because I spent 3 (And then 4) moves in the same corner? Sure, I wanted to see how effective it would be but...
Also, W150 at T11 wasn't a move I considered until after I decided not to capture!
Black t8 was bad because it made his atari, which he didn't do, sente.
L5 and E8 are how badly I give up points when I think I'm ahead. For L5 I was thinking there was some aji with the cut next to the left, but then I could just decide to give up two stones?
The pincer in TL was bad.
. Before that, what to say?
at Q5. You'd welcome
at P4 and just push; but what else does White have?
seems to undermine the usefulness of the group above, so the Matthews rules say you either play C6 or tenuki.
should be OK. But with such a vague shape on the lower side I'd be worrying about White at M4 at an awkward moment.
lacks stab-in-the-back subtlety, and Black takes advantage. White makes a poor exchange on the right, and
is strong, if obvious.