This problem took me too much time. After I solved it I wondered why it was so difficult. Well, to make up for the time spent, I publish it here on L19.
$$Bc Black to play ~7kyu
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . , . X . . |
$$ | . . . . . . . . . |
$$ | . . , . , O O . . |
$$ | . . . O O X O . . |
$$ | . . , O X X X . . |
$$ | . . . O O X . . . |
$$ | . . . . . . . . . |
$$ +-------------------+
[go]$$Bc
$$ +-------------------+
$$ | . . . . . . . . . |
$$ | . . . . . . . . . |
$$ | . . , . , . X . . |
$$ | . . . . . . . . . |
$$ | . . , . , O O 4 8 |
$$ | . . . O O X O 3 c |
$$ | . . , O X X X . X |
$$ | . . . O O X . 1 . |
$$ | . . . . . 7 2 6 a |
$$ +-------------------+[/go]
After this diagram w can choose between a and c to make ko. No idea which is better.
edit: added another section. I hope CnP likes it better!
Re: tsumego, maeda, elementary #87
Posted: Mon Aug 06, 2012 3:09 pm
by CnP
I'm doing this set but that problem was no use for me. I'm also studying All about life and death and that problem is literally a textbook example of how knowledge of L groups speeds up finding the solution apparently. Sadly I remembered it when I came to it in this set so I couldn't test myself on it
at 3. OC the distant black stone will play it's role.
at J3 in the last diagram?
edit: added another section. I hope CnP likes it better!
forces 
.