Life In 19x19

From a 9x9-game I played on OGS against a 1d. Looks like a standard shape (and maybe there is a standard answer), but I had to resort to non-standard solutions (well, for my (3k) standard of standard ;). I found it highly instructive and enjoyable. You might too:

White to live:

Click Here To Show Diagram Code

[go]$$W
$$ ----------------------
$$ | . . . . . . O . . |
$$ | . . . X . X O . B |
$$ | . . . . X . . . . |
$$ | . . . . . X O . O |
$$ | . . . . X . O O X |
$$ | . . . . X O O X . |
$$ | . . . X . X X . X |
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ ----------------------[/go]

If you think "I only see ko", think harder.

Ahh, missed something:

for all: You can assume that black has a fair amount of external ko threads.

sodesune:

your first answer:
I agree with a lot of what you say. But in the last diagram, white has a better 3, although there is a lot of damage. And anyway, white has a better 1.

your second answer:
I don't agree with your 1. Ko was no option.

SoDesuNe: Another variation for b to capture some stones, but I think white lives. edit:
I suppose we could force this:

Ahaha, yeah, makes sense : )

Well, I only added the Ko because I thought White could win it anyway. Your "[...] black has a fair amount of external ko threads" makes it clearer, thanks.

Click Here To Show Diagram Code

[go]$$Wc Black komaster, White to live
$$ ----------------------
$$ | . . . . . . O . 2 |
$$ | . . . X . X O 1 X |
$$ | . . . . X . . . . |
$$ | . . . . . X O . O |
$$ | . . . . X . O O X |
$$ | . . . . X O O X . |
$$ | . . . X . X X . X |
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ ----------------------[/go]

Where next?

Bill Spight wrote:....

Where next?