I believe this might be the first move?
$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | a O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | b O O X . O . . . .
$$ | . O X X O . . . . .
$$ | . . . . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | a O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | b O O X . O . . . .
$$ | . O X X O . . . . .
$$ | . . . . . . . . . .
$$ ---------------------[/go]
White can play either 'a' or 'b'.
This first move does not seem to work:
$$c 手筋(二): Black to play
$$ | . 6 . . . . . . . .
$$ | . 5 O . O . . . . .
$$ | . O X O . . . . . .
$$ | . O X . . . . . . .
$$ | 2 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 4 O O X . O . . . .
$$ | 1 O X X O . . . . .
$$ | . 3 . . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . 6 . . . . . . . .
$$ | . 5 O . O . . . . .
$$ | . O X O . . . . . .
$$ | . O X . . . . . . .
$$ | 2 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 4 O O X . O . . . .
$$ | 1 O X X O . . . . .
$$ | . 3 . . . . . . . .
$$ ---------------------[/go]
White wins without Ko.
Back to the original first move:
$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 2 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | a O O X . O . . . .
$$ | 3 O X X O . . . . .
$$ | . b . . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 2 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | a O O X . O . . . .
$$ | 3 O X X O . . . . .
$$ | . b . . . . . . . .
$$ ---------------------[/go]
Now

seems to work. 'a' and 'b' are Miai for either Ko or shortage of liberties. Defending at

also leads to a Ko after Black 'b' (when White decides to defend at 'a' afterwards).
Ko seems pretty straightforward. What about White 'b'? Can Black make a living shape?
$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 2 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 5 O O X . O . . . .
$$ | 3 O X X O . . . . .
$$ | 6 4 . . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 2 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 5 O O X . O . . . .
$$ | 3 O X X O . . . . .
$$ | 6 4 . . . . . . . .
$$ ---------------------[/go]
$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 7 O O X . O . . . .
$$ | 8 O X X O . . . . .
$$ | O O 9 . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 7 O O X . O . . . .
$$ | 8 O X X O . . . . .
$$ | O O 9 . . . . . . .
$$ ---------------------[/go]
$$Wcm10 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . 1 O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 2 O O X . O . . . .
$$ | O O X X O . . . . .
$$ | O O X . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$Wcm10 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . 1 O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 2 O O X . O . . . .
$$ | O O X X O . . . . .
$$ | O O X . . . . . . .
$$ ---------------------[/go]
$$Wcm12 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . O O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | X 1 . X . O . . . .
$$ | . a X X O . . . . .
$$ | . . X . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$Wcm12 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . O O . O . . . . .
$$ | . O X O . . . . . .
$$ | O O X . . . . . . .
$$ | . O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | X 1 . X . O . . . .
$$ | . a X X O . . . . .
$$ | . . X . . . . . . .
$$ ---------------------[/go]
Ko again, isn't it?
Black takes first here, that's a plus. Although White also got a local threat at 'a'. (Black got local threats to run out, too.)
Guess, no variation here?
So, back to the start: What about White 'b' in response?
$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 4 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 2 O O X . O . . . .
$$ | 5 O X X O . . . . .
$$ | 6 3 . . . . . . . .
$$ ---------------------
- Click Here To Show Diagram Code
[go]$$c 手筋(二): Black to play
$$ | . . . . . . . . . .
$$ | . . O . O . . . . .
$$ | . O X O . . . . . .
$$ | 4 O X . . . . . . .
$$ | 1 O X O O . . . . .
$$ | O X X X . . . . . ,
$$ | 2 O O X . O . . . .
$$ | 5 O X X O . . . . .
$$ | 6 3 . . . . . . . .
$$ ---------------------[/go]
Pretty straightforward Ko again, I guess.
So, that would conlcude my answer, I hope I didn't bodge too hard ^^