Nothing to do but block here. I discarded the turn at P17 because that lets him escape down the right side, and I don't want that (at least, I don't THINK I want that ...).

Hmmm ... he might be able to tenuki here ... although I can then enclose him in a small corner in sente (reduced to an L+1 group with at P18). I think I can be happy here so far.

I think I should invade his moyo, but I have no real idea of how. I'll just try this.

If my reading is correct, he can not kill my corner. The best he can do is drive me out.
This is the most dangerous variation I found:

Click Here To Show Diagram Code

[go]$$Bm1
$$ ---------------------------------------
$$ . . . . . . . . 3 . . |
$$ . . . . . . 1 2 . . . |
$$ . . . X . . . O O O . |
$$ . O . . . . X X X O . |
$$ . . . . . . . . . X . |
$$ . . . . . . . . X . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |[/go]

But I can get out:

Click Here To Show Diagram Code

[go]$$Wm1
$$ ---------------------------------------
$$ . . . . . . . . X . . |
$$ . . . . . 2 X O . . . |
$$ . . . X 4 3 1 O O O . |
$$ . O . 0 9 5 X X X O . |
$$ . . . . 6 7 . . . X . |
$$ . . . . . 8 . . X . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |[/go]

Click Here To Show Diagram Code

[go]$$Wm1
$$ ---------------------------------------
$$ . . . . . . . . X . . |
$$ . . . . . X X O . . . |
$$ . . . X X O O O O O . |
$$ . O . X O O X X X O . |
$$ . . . 2 X O 5 8 7 X . |
$$ . . . . 1 X 3 9 X . . |
$$ . . . . . 4 6 . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |[/go]

Click Here To Show Diagram Code

[go]$$Bm1
$$ ---------------------------------------
$$ . . . . . . . . X . . |
$$ . . . . . X X O . . . |
$$ . . . X X O O O O O . |
$$ . O . X O O X X X O . |
$$ . . . X X O O X 1 X . |
$$ . . . . X X O O X . . |
$$ . . . . . X X 2 . . . |
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |[/go]

For example.
I don't know, which way out is best.
I think it would be bad for black to try getting me out and build that wall facing the left side, as his R16 group would get under attack which I could attack from the bottom. My profit would be larger than his, I think.

The painful truth is that I don't know what to do against this probe. D4 seems slack, and White would probably just move to another point on the board and leave aji for later. I've opted for the hane, but I'm in unfamiliar territory here ...

My corner is now settled, and his stones are floating. The cut is already somewhat protected by E3.

If I made a two point jump to C9 or something similar, black D6 would be pretty fatal, so I first make a turn and decide on what to do next later.

My corner isn't going anywhere, so let's seal up the upper right. Should be sente. Then I can decide where next (or maybe come back and play E5).

I don't know if he wants to confine me to the corner or drive me out, but I think black will have less influence and points and possibly two groups if I get out.

Now he needs to play Q18 and (after I play O18) one other move to live in the corner, with 6 points in gote life. Once we're settled up here I need to decide what's biggest. Three candidates: R7, H3, C16. I also like C8/C9, but I haven't finished evaluating that area. D4 looks gote for W (at least, it looks like it to me), so I'm less inclined to play E5 without considering other options.

I have to be careful not to out-think myself and get too clever. I'm happy with my play so far ...

This corner is now a shape known as L+1. White owes a move, otherwise I kill the corner.

Making life.

I think I'll slide here first and see how he responds. No need to rush things.

Hmm, = (a) seemed slow, and a miss — the turn is sente:

Click Here To Show Diagram Code

[go]$$Bc
$$ -----------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . 3 2 4 . . . |
$$ | . . . . . O . . . . . X . . 1 O O O . |
$$ | . . . O . . . . . O . . . . X X X O . |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ | . . X . . . . . . . . . . . . . a . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |[/go]

And (B jumped at ) is wrong shape for the same reason; B should turn solidly at .
In the real game, B is left with a cut at o16.

Click Here To Show Diagram Code

[go]$$B
$$ | . . . X . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . W a . . . . . . . . . . . . O . . |
$$ | . b X 1 . . . . . O . . . . . , . . . |
$$ | . . . . X . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

About = (a):I have the opposite feeling: either or descend to (b) seems more severe than the hane (a).

Click Here To Show Diagram Code

[go]$$Bm31
$$ -----------------------------------------
$$ | . . . . . . . . . . . . . . . . . O . |
$$ | . . . . . . . . . . . . . X X O . . . |
$$ | . . . . . O . . . . . X . X O O O O . |
$$ | . 3 . O . . . . . O . . . . X X X O . |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ | . . X . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . O X . . . . . . . . . . . . O . . |
$$ | . X X , . . . . . O . . . . . , . . . |
$$ | . . . . X . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

I wonder if B should reply locally with —
it's too painful for W to allow the (a) turn.

Click Here To Show Diagram Code

[go]$$B
$$ -----------------------------------------
$$ | . . . . . . . . . . . . . . . . . O . |
$$ | . . . . . . . . . . . . . X X O . . . |
$$ | . . . . . O . . . . . X . X O O O O . |
$$ | . . . O . . . . . O . . . . X X X O . |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ | . . X . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O a . . . . . . . . . . . . . . |
$$ | . . O X 1 . . . . . . . . . . . O . . |
$$ | . X X , . . . . . O . . . . . , . . . |
$$ | . . . . X . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

I only looked at the left side / upper left side, as that place seemed urgent, and the proverb says 'play urgent moves before big ones'.
I didn't want to play on the 3-3, as the territory/influence of those 4 white stones would be very easily reducable.
I thought about separating the D10 stone from the C14/B16 stones, but then I realized that the B16 stones could easily make 2 eyes with 1 move on the 3-3 and then what would I have? An attack on a single high stone and myself having 2 weak groups?
So I thought that when I still would play the 3-3, that he probably should reinforce and connect his stones afterwards, giving me sente, so I thought about playing 3-3 again.
I couldn't find anything more appealing to me.

No reason not to keep going with my overall plan. White has initiative now, and can play where they wish.