I'm not yet convinced the previous exchange was necessary, but getting here first at a time when moves in this area were at least to some extent double sente was very good. Perhaps I played too passively sometime in the last twenty moves.
Connecting at
a should also be sente against cutting around the marked stone, but I am not sure how sternly I can resist here.
$$Bcm77 Prisoners:

$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . O . X . . . O X . . . . |
$$ | . . . O X . X . O . . X O O X O . . . |
$$ | . . O O O . . . . O . . O X X X O . . |
$$ | . . X . . . O . . . O . . O X X X . . |
$$ | . . X O O . . X . . . . . . . X . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . X . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . X , . . . . . , . . . . . X . X X |
$$ | . . . . . . . . . . . . . . O X . X O |
$$ | . . . . . . . . . . . . . . X . X X O |
$$ | . . . . . . . . . . . . . . . X O O O |
$$ | . . O . . . . . . . 0 7 8 . . X O . O |
$$ | . . . . . . . . . . . 6 5 9 . . X O . |
$$ | . . . O . . . . . , . . O X a X . O . |
$$ | . . O . . X . . X . . . O 1 . 3 O . . |
$$ | . . . X . . . . . . . . . 2 W 4 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$Bcm77 Prisoners:

$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . O . X . . . O X . . . . |
$$ | . . . O X . X . O . . X O O X O . . . |
$$ | . . O O O . . . . O . . O X X X O . . |
$$ | . . X . . . O . . . O . . O X X X . . |
$$ | . . X O O . . X . . . . . . . X . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . X . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . X , . . . . . , . . . . . X . X X |
$$ | . . . . . . . . . . . . . . O X . X O |
$$ | . . . . . . . . . . . . . . X . X X O |
$$ | . . . . . . . . . . . . . . . X O O O |
$$ | . . O . . . . . . . 0 7 8 . . X O . O |
$$ | . . . . . . . . . . . 6 5 9 . . X O . |
$$ | . . . O . . . . . , . . O X a X . O . |
$$ | . . O . . X . . X . . . O 1 . 3 O . . |
$$ | . . . X . . . . . . . . . 2 W 4 . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
$$Bcm87 Prisoners:

$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . O . X . . . O X . . . . |
$$ | . . . O X . X . O . . X O O X O . . . |
$$ | . . O O O . . . . O . . O X X X O . . |
$$ | . . X . . . O . . . O . . O X X X . . |
$$ | . . X O O . . X . . . . . . . X . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . X . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . X , . . . . . , . . . . . X . X X |
$$ | . . . . . . . . . . . . . . O X . X O |
$$ | . . g . . . . . . . . . . . X . X X O |
$$ | . . . . . . . . . . z 1 . . . X O O O |
$$ | . . O . h . . . . . O X O . . X O . O |
$$ | . . . . . . . . . y . O X X . . X O . |
$$ | . . . O . . . . . , 2 . O X . X . O . |
$$ | . . O . . X . . X . . . O X . X O . . |
$$ | . . f X . . . . . . x . . O O O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$Bcm87 Prisoners:

$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . O . X . . . O X . . . . |
$$ | . . . O X . X . O . . X O O X O . . . |
$$ | . . O O O . . . . O . . O X X X O . . |
$$ | . . X . . . O . . . O . . O X X X . . |
$$ | . . X O O . . X . . . . . . . X . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . X . . X . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . X , . . . . . , . . . . . X . X X |
$$ | . . . . . . . . . . . . . . O X . X O |
$$ | . . g . . . . . . . . . . . X . X X O |
$$ | . . . . . . . . . . z 1 . . . X O O O |
$$ | . . O . h . . . . . O X O . . X O . O |
$$ | . . . . . . . . . y . O X X . . X O . |
$$ | . . . O . . . . . , 2 . O X . X . O . |
$$ | . . O . . X . . X . . . O X . X O . . |
$$ | . . f X . . . . . . x . . O O O . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
After which I have something like
x, and
y if I don't want
z. I imagine Ed wants to make it to
f,
g or
h first as well somehow.