To get an idea of where the game stands now, lets count points.
Black has 20 in the upper right, 20 in the lower right, and 10 in the upper left. A play at E18 grabs another 10.
If white secures E18 in gote, black gets at least 10 in the lower left side.
Even if we round down, it is hard to imagine black with less than 55 points.
White gets maybe 15 on the right, another 15 in the lower left, 5 up top, and a few miscellaneous points elsewhere.
It looks like about 40 points, maybe 50 if everything in yose goes white's way. ( And this is assuming that white somehow saves his top middle group )
In summary, with even the most white-biased counting, black still wins.
Thus the only way for white to win is to kill something. Another way of phrasing that is that black need only secure life for all of his groups to win.
Let's start with the most dubious proposition above: that white's upper middle group can live.
He can try something like this:
$$Wc
$$ -----------------------------------
$$ | . . . . . . . . . . 0 . . . . . . . . |
$$ | . X O O . . . . 6 5 . 1 2 . . . . . . |
$$ | . X O X . O O X . O 3 X 4 . . . . . . |
$$ | . . X X . O O X X O . O X X . X . X . |
$$ | . . . . . X O . X X O . O . . . . . . |
$$ | . . . X . X O . . . O . 9 . . . O . . |
$$ | . . . . . O O X . X O 7 X X . O . . . |
$$ | . X . X . . . . . . X O . . . O X . . |
$$ | . O . . X O . . . . X . X . . . . . . |
$$ | . . O O . O X X X , X . . 8 O , O . . |
$$ | . O X O . O O O . O O . . . . . . . . |
$$ | . . X X X O . . . O X . . X O . X . . |
$$ | . . . X O O X . . . . . O O . . . . . |
$$ | . . O X . X . . . . . . . . X . X . . |
$$ | . . . . . X X . X X X X O . . . . . . |
$$ | . . X X . . . . O . . O . O . X . . . |
$$ | . X O X X O O . O X X . . O X . . . . |
$$ | . O O O O . . X O . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ----------------------------------------
- Click Here To Show Diagram Code
[go]$$Wc
$$ -----------------------------------
$$ | . . . . . . . . . . 0 . . . . . . . . |
$$ | . X O O . . . . 6 5 . 1 2 . . . . . . |
$$ | . X O X . O O X . O 3 X 4 . . . . . . |
$$ | . . X X . O O X X O . O X X . X . X . |
$$ | . . . . . X O . X X O . O . . . . . . |
$$ | . . . X . X O . . . O . 9 . . . O . . |
$$ | . . . . . O O X . X O 7 X X . O . . . |
$$ | . X . X . . . . . . X O . . . O X . . |
$$ | . O . . X O . . . . X . X . . . . . . |
$$ | . . O O . O X X X , X . . 8 O , O . . |
$$ | . O X O . O O O . O O . . . . . . . . |
$$ | . . X X X O . . . O X . . X O . X . . |
$$ | . . . X O O X . . . . . O O . . . . . |
$$ | . . O X . X . . . . . . . . X . X . . |
$$ | . . . . . X X . X X X X O . . . . . . |
$$ | . . X X . . . . O . . O . O . X . . . |
$$ | . X O X X O O . O X X . . O X . . . . |
$$ | . O O O O . . X O . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ----------------------------------------[/go]
...or this:
$$Wc
$$ -----------------------------------
$$ | . . . . . . . . . 9 . . . . . . . . . |
$$ | . X O O . . . 6 5 . . 1 2 . . . . . . |
$$ | . X O X . O O X . O 3 X 4 . . . . . . |
$$ | . . X X . O O X X O . O X X . X . X . |
$$ | . . . . . X O . X X O . O . . . . . . |
$$ | . . . X . X O . . . O . 0 . . . O . . |
$$ | . . . . . O O X . X O 7 X X . O . . . |
$$ | . X . X . . . . . . X O . . . O X . . |
$$ | . O . . X O . . . . X . X . . . . . . |
$$ | . . O O . O X X X , X . . 8 O , O . . |
$$ | . O X O . O O O . O O . . . . . . . . |
$$ | . . X X X O . . . O X . . X O . X . . |
$$ | . . . X O O X . . . . . O O . . . . . |
$$ | . . O X . X . . . . . . . . X . X . . |
$$ | . . . . . X X . X X X X O . . . . . . |
$$ | . . X X . . . . O . . O . O . X . . . |
$$ | . X O X X O O . O X X . . O X . . . . |
$$ | . O O O O . . X O . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ----------------------------------------
- Click Here To Show Diagram Code
[go]$$Wc
$$ -----------------------------------
$$ | . . . . . . . . . 9 . . . . . . . . . |
$$ | . X O O . . . 6 5 . . 1 2 . . . . . . |
$$ | . X O X . O O X . O 3 X 4 . . . . . . |
$$ | . . X X . O O X X O . O X X . X . X . |
$$ | . . . . . X O . X X O . O . . . . . . |
$$ | . . . X . X O . . . O . 0 . . . O . . |
$$ | . . . . . O O X . X O 7 X X . O . . . |
$$ | . X . X . . . . . . X O . . . O X . . |
$$ | . O . . X O . . . . X . X . . . . . . |
$$ | . . O O . O X X X , X . . 8 O , O . . |
$$ | . O X O . O O O . O O . . . . . . . . |
$$ | . . X X X O . . . O X . . X O . X . . |
$$ | . . . X O O X . . . . . O O . . . . . |
$$ | . . O X . X . . . . . . . . X . X . . |
$$ | . . . . . X X . X X X X O . . . . . . |
$$ | . . X X . . . . O . . O . O . X . . . |
$$ | . X O X X O O . O X X . . O X . . . . |
$$ | . O O O O . . X O . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ----------------------------------------[/go]
I don't see how it lives. ( It gets tricky around P15 in some lines, but black always comes out ahead. )