This was played last night in a noisy coffehouse and was a bit rushed trying to finish before they closed. So perhaps we did not play our best.

I bungled the right side, I think, giving up way too much territory for the influence that I got. Any advice about how to play better over there would be welcome. ( especially in the range of moves 7 - 21 )

I thought that his play at C13 seemd the wrong direction, and thus gave me good chances.

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- For 7 why not just answer with knight's move? That does not fall behind territorially, and if he then makes a mini-chinese the top side becomes a perfect extension from your shimari and stop his moyo expanding. Of course approach playable too, but more complex.
- 9 kosumi is an influence move, a bit old style. I would r17 but I won't say kosumi wrong just harder to use.
- 11 This could be the problem. It's not a joseki move with the top right corner. Now you can deviate from joseki, but first understand why the joseki is the joseki. q12 press is connected with your kosumi group and builds a wall. Looks ok here, white has two lower stones on the right. But I don't like white's n17 reducing the value of your top side extension. You make a new group here. Yes it pincers white's lower right approach, but it is not severe on it. It's not as though after the obvious p13 you will play some awesome move against r6. p14 stones can't really be sacrificed. You then go about settling those, but you don't have enough space for 2 eyes there so that's unsatisfactory. If you wanted to do stuff there better to r17 instead of kosumi, or r17 instead of r10.
- 19 is wrong shape I think, giving white o12 sente. n14 better. m17 followup is not as important.
- 21 Ugh what? I'm tempted to sacrifice. If you play o3 can you persuade white to r9 honte. If so you can get some nice kikashi to minimize the sacrifice at o12 r14 r5 and s6 and then tenuki is my plan. I really want to push o12 to correct the n15 mistake but to do that you need to give up r10. Maybe white should o12 himself pronto and not r9 honte.

Edit: 11 does seem to be the problem. I pattern searched the right side at that position. 15 hits for the press (67% win), 5 for 3-3 attach (40% win). nothing else played.

A few comments on the opening.

General comment: I sense a heaviness to your play, also some thinness. I know that's not terribly helpful, but I think that both things come into play on the right side.

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How many times was the Q-12 press met by the R-16 kosumi? R-15 was joseki before Takagawa discovered R-16. It makes a sente-gote difference.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

kosumi 8 times, double approach at bottom 4 times. ("R-15 was joseki" typo for p14 initial kosumi?)

No, no typo. I have edited the variations in my note #3 to add the joseki with R-15 after Q-12.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.