Dieter: It's ko.
Robert Pauli: Right.
The symmetric is wrong.
Robert Pauli: Indeed.
Miai for life: is wrong.
Miai for life: is wrong again.
Notice the importance of the marked stone.
Robert Pauli: Can't remember these ones . . .
Dieter: If the marked stone isn't there, Black can play b for White a, cut and force White to fill his second eye before she can capture the three stones.
Robert Pauli: Yes, and the other line isn't bad either (DGoZ 3/03, problem 5, by the way):
As ugly might be, it wins White the capturing race. Bamboo with
wouldn't.