Ok, I read this out, and I think I can get at least a seki. There is also a ko possibility but I'm not sure I can win it yet. Either way this move absolutely necessary to reduce liberties of that black chain.

If B resists the following is a one way street:

Click Here To Show Diagram Code

[go]$$Bc W8 at a gives Black choice of ko or seki
$$ ---------------------------------------
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . O O O O X X . . . . . . . . . . . . |
$$ | O . . O O X O X . . . X . . . . . . . |
$$ | . O O X X O O X . X . . . . . X . . . |
$$ | . X O X a . . O O . . . . . . . . . . |
$$ | . 7 X X O . O . . . . . . . . . . . . |
$$ | . 6 . X O . . . . . . . . . . . . . . |
$$ | . 4 2 O X . . . . . . . . . . . . . . |
$$ | . 5 3 1 . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Click Here To Show Diagram Code

[go]$$Bc ko variation : Black takes first. I have threat at 'a' but Black will probably ignore, and while I gain locally I end in gote. This might not be good enough.
$$ ---------------------------------------
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . O O O O X X . . . . . . . . . . . . |
$$ | O . . O O X O X . . . X . . . . . . . |
$$ | 6 O O X X O O X a X . . . . . X . . . |
$$ | 5 X O X O . . O O . . . . . . . . . . |
$$ | 4 X X X O . O . . . . . . . . . . . . |
$$ | 1 O . X O . . . . . . . . . . . . . . |
$$ | 2 O O O X . . . . . . . . . . . . . . |
$$ | 3 X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

If I do this..

Click Here To Show Diagram Code

[go]$$Wc
$$ ---------------------------------------
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . O O O O X X . . . . . . . . . . . . |
$$ | O . . O O X O X . . . X . . . . . . . |
$$ | 4 O O X X O O X . X . . . . . X . . . |
$$ | 1 X O X 5 . . O O . . . . . . . . . . |
$$ | 2 X X X O . O . . . . . . . . . . . . |
$$ | 3 O . X O . . . . . . . . . . . . . . |
$$ | . O O O X . . . . . . . . . . . . . . |
$$ | . X X X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

This ko seems to favor me quite a bit. I even have a local ko threat at e11, and I can't spot any for Black.

White has chosen to seal me in. I'm okay with this because white has little profit and no moyo.

Click Here To Show Diagram Code

[go]$$Wc Move 39 Prisoners: B=0, W=2
$$ ---------------------------------------
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . O O O O X X . . . . . . . . . . . . |
$$ | O . . O O X O X . . . X . . . . . . . |
$$ | . O O X X O O X . X . . . . . X . . . |
$$ | 5 X O X . a . O O . . . . . . . . . . |
$$ | . 6 X X O . O . . . . . . . . . . . . |
$$ | . 4 . X O . . . . . . . . . . . . . . |
$$ | . . B O X 9 . . . . . . . . . . . . . |
$$ | . 8 2 1 . . . . . . . . . . . . . . . |
$$ | . . 7 3 . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

White could try something like this to eat into my territory on the left, which wasn't very much to begin with. White would get thickness that doesn't seem particularly useful, and the group's shape is vulnerable at A.

Click Here To Show Diagram Code

[go]$$Bc Move 39 Prisoners: B=0, W=2
$$ ---------------------------------------
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . O O O O X X . . . . . . . . . . . . |
$$ | O . . O O X O X . . . X . . . . . . . |
$$ | . O O X X O O X . X . . . . . X . . . |
$$ | O X O X 5 1 2 O O . . . . . . . . . . |
$$ | . X X X O 3 O . . . . . . . . . . . . |
$$ | . X . X O 4 a . . . . . . . . . . . . |
$$ | . . X O X O . . . . . . . . . . . . . |
$$ | . X X O . b . . . . . . . . . . . . . |
$$ | . . O O . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

After this exchange, black can put pressure on white at points like a or b.

I guess I panicked for nothing.