Life In 19x19

I was playing black in a face-to-face match when white played this move:

Click Here To Show Diagram Code

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

The resulting sequence killed my corner. Is there any way for black to salvage the position here and make some kind of life?

There is something wrong with your diagram (at least there is an extra empty line, and I think by Q you mean W. Like this:

Click Here To Show Diagram Code

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

e: and to answer your question: black looks pretty dead to me.

Thanks, I meant to preview

Fixed in the original post.

Click Here To Show Diagram Code

[go]$$B
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X . . . |
$$ . O . . . . . |
$$ . . . . . . . |
$$ ------------[/go]

1 above seems like only move black can play to stay alive.
not reading too deeply...it is very hard to kill black without ko.

i think you need to give little more info on top and left side.

Looks like ko after B1 given by above, if Black doesn't have a chance to escape along the edge.

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X 7 0 . |
$$ . O 6 2 3 4 . |
$$ . . . 5 9 8 . |
$$ ------------[/go]

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . 2 . |
$$ . . . O O 1 . |
$$ . O . . X X . |
$$ . O X X . O 3 |
$$ O . O X X O . |
$$ . O O O X O . |
$$ . . . X X O . |
$$ ------------[/go]

Something like this?

edit: that variation actually might just be dead for W. Anyway, there are lots of variations to explore, I wouldn't say this is clearly dead for B. Escape up the right side is a powerful threat.

aurik wrote:Looks like ko after B1 given by above, if Black doesn't have a chance to escape along the edge.

$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X 7 0 . |
$$ . O 6 2 3 4 . |
$$ . . . 5 9 8 . |
$$ ------------

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X 7 0 . |
$$ . O 6 2 3 4 . |
$$ . . . 5 9 8 . |
$$ ------------[/go]

Something like this?

Black can play @ W10 and is clearly alive.

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X . 7 . |
$$ . O 6 2 3 4 . |
$$ . . . 5 9 8 . |
$$ ------------[/go]

This is the best I could come up with; looks like white should get at least ko.

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X 4 . . |
$$ . O . 3 2 5 7 |
$$ . . . 8 . 6 . |
$$ ------------[/go]

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X X . |
$$ . O X X . O . |
$$ O . O X O . . |
$$ . O 2 X O X X |
$$ . . 1 O 3 O . |
$$ ------------[/go]

Yes, much better.

B5 allows W to play 6 in sente, setting up the ko. So naturally, I questioned that move, but the alternative B5 @ 7 also seems to lead to ko.

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W . |
$$ O . O X 4 . . |
$$ . O . 3 2 . 5 |
$$ . . . . . . . |
$$ ------------[/go]

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . h O O f . |
$$ . O . e X 1 g |
$$ . O X X c W a |
$$ O . O X 4 . b |
$$ . O 9 3 2 0 5 |
$$ . . 7 6 8 . d |
$$ ------------[/go]

B@a -> W@b throw-in ko
B@b -> W@a, then if B@c, W@d throw-in ko
B@b -> w@a, if B@d, W@f, B@g, W@c. The corner is bent-4 but not dead as the status of the surrounding B group is questionable, so it will probably be played out as a ko, my guess is that should be played immediately at this point. Once again, W must find the first threat.

See anything I've missed?

Edit: of these options, I like option 2 the best. Option 3 gives W the forcing move at f. Option 1 and 2 look quite close, but option 2 is perhaps slightly better late in the game, as there is the possibility of an additional ko threat (at the 1-1 point) if all of black's outside liberties are filled.

i think it is alive..

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W 5 |
$$ O . O X . 3 . |
$$ . O . 4 2 . . |
$$ . . . . . . . |
$$ ------------[/go]

Magicwand wrote:i think it is alive..

$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W 5 |
$$ O . O X . 3 . |
$$ . O . 4 2 . . |
$$ . . . . . . . |
$$ ------------

Click Here To Show Diagram Code

[go]$$B
$$ . . . . . . . |
$$ . . . O O . . |
$$ . O . . X 1 . |
$$ . O X X . W 5 |
$$ O . O X . 3 . |
$$ . O . 4 2 . . |
$$ . . . . . . . |
$$ ------------[/go]

neat, is a nice tesuji; I can't see anything else then.