SamT wrote:I'm too close to the game, so I cannot see the opportunities I missed.
All of this is of course guesswork. All I know for sure is that I am really, REALLY, --REALLY-- bad at blitz.
1227623-297-nikwdhmos-Juanjo Pina.sgf
Problems at the level of intuitions, though.

Play a low approach at the top if you want to limit Black's framework. That way you aim to settle a group quickly. This leads to trouble.

Play F4 on instinct. You seem to be missing this shape.

Jumping to N7 looks better to me. You develop thin shape this way, and Black's framework is untouched.

Why? A ladder-breaker plan?

One to the left, obviously ...

A whole move wasted.

The central fight has become serious. H2 is going to be big, so you have to take care of the three stones as priority. I'm a fan of plays like H11, aiming at H9 for good shape. At the least they may baffle the opponent.

Just play E13. You gain every time this shape is made with stones that are
not heavy.

The game seems to turn Black's way.

Yes, but you can't win the game with two big corners on the left.

Ouch.

Wrong feeling. Leave these guys, play something like P9 I think.

wastes another play.

D2 kills.

Poor feeling, aji keshi.

Practically a wasted play again. Comments end.