Life In 19x19

$$Bc Same problem as before?
$$ ---------------------
$$ | . . X . . . . . . . |
$$ | . . . . . . . . . . |
$$ | . X X O . . . . . . |
$$ | . O X O . . , . . . |
$$ | 1 . O X O . . . . . |
$$ | . O O X O . . . . . |
$$ | . O X X O . , . . . |
$$ | X O X . O . . . . . |
$$ | 2 X X O ...

So I believe that :b1: must be at the same spot as in the book:

$$Bc
$$ ---------------------
$$ | . . X . . . . . . . |
$$ | . . . . . . . . . . |
$$ | . X X O . . . . . . |
$$ | . O X O . . , . . . |
$$ | 1 . O X O . . . . . |
$$ | 7 O O X O . . . . . |
$$ | 3 O X X O . , . . . |
$$ | X O X 4 O ...

My two cents, in a relatively bad currency:

'b' is, in isolation just worse than 'a' if black later decides to sacrifice.

Thanks, that makes sense now that I think about it. :scratch:

This appears to have only one solution. What is it?
:study:

I think :b1: (b) is wrong this time, because ...

In Lee Changho's Selected Tesuji Problems, I've encountered a tesuji-problem which, I think, has two solutions (a and b):


Black to play
$$
$$ ---------------------
$$ | . . X . . . . . . . |
$$ | . . . , . . . . . , |
$$ | . X X O . . . . . . |
$$ | . O X O . . . . . . |
$$ | a . O X O ...