I'm trying to work through Invincible starting with Shusaku's famous 'ear-reddening' game. After his mistake in the taisha joseki in the lower right one of the possible but bad alternatives for Black is the following diagram:

Click Here To Show Diagram Code

[go]$$Bcm1
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . O . . . . |
$$ | . . . , . . . . . , . . . . . , X . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . . . . . . . . . . O X . . . |
$$ | . . . . . . . . . . . . . . O X O . . |
$$ | . . X , X . . . . , . . O O X O O . . |
$$ | . . . . . . . . . . 2 O X X X X O . . |
$$ | . . . . . . . . . . O X . 7 . . 3 4 . |
$$ | . . . . . . . . . . . . 1 . . 5 . 6 . |
$$ ---------------------------------------[/go]

What I'm trying to understand now is, what happens in the lower right if Balck tenukis with . The best for White I can find is a multi-step ko in his favor and the respective line can be found in the hide tags:



So, what's your line for White? Or have I found the best?

Your vital point is mine?

_________________
My "guide" to become stronger in Go

Of course I considered SoDesuNe's and , but not . Thank you!
Furthermore, my multi-step ko seems not so multi anymore...

The real issue is the white influence. Shusaku wanted to damage it as much as possible otherwise the game would be over even if he lived.