Click Here To Show Diagram Code

[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O 2 X X X . . . . . . .
$$ | . 1 X O O . X . . . . . .
$$ | . 3 O . O X . . . . . . .
$$ | . . . . . . . . . . . . .
$$ |--------------------------[/go]

Click Here To Show Diagram Code

[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O 4 X X X . . . . . . .
$$ | 5 1 X O O . X . . . . . .
$$ | 3 2 O . O X . . . . . . .
$$ | . . . . . . . . . . . . .
$$ |--------------------------[/go]

Here's my attempt. Am I missing something? Wait, saw what I was missing.

Click Here To Show Diagram Code

[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O 4 X X X . . . . . . .
$$ | 5 1 X O O . X . . . . . .
$$ | 3 2 O . O X . . . . . . .
$$ | b 6 . a . . . . . . . . .
$$ |--------------------------[/go]

'a' doesn't work because of 'b', so white lives below. Maybe I'll be able to see it in the morning.

Since this is presented as a problem, the initial move should be something fancy
What about this:

Click Here To Show Diagram Code

[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O 4 X X X . . . . . . .
$$ | . 2 X O O . X . . . . . .
$$ | . 1 O b O X . . . . . . .
$$ | . . 3 a 5 . . . . . . . .
$$ |--------------------------[/go]

ko at a-b?

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

or

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[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O . X X X . . . . . . .
$$ | . 2 X O O . X . . . . . .
$$ | . 1 O 4 O X . . . . . . .
$$ | . . 3 . 5 . . . . . . . .
$$ |--------------------------[/go]

Are you sure?

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[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | . O 4 X X X . . . . . . .
$$ | 5 1 X O O . X . . . . . .
$$ | 3 2 O . O X . . . . . . .
$$ | b 6 . a . . . . . . . . .
$$ |--------------------------[/go]

Click Here To Show Diagram Code

[go]$$Bc Black to play
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . X X . . . . . . . . . .
$$ | . O X . . . . . . . . . .
$$ | 4 O O X X X . . . . . . .
$$ | a C b O O . X . . . . . .
$$ | C O O 3 O X . . . . . . .
$$ | 2 O . 1 5 . . . . . . . .
$$ |--------------------------[/go]

a and b are miai to kill, I think. Thanks, Kirby![/

Actually, I made the first mistake when I first approached this problem. I read the same sequence as you did, and thought that "a" did not work.