July 13, 2009
Black 1 is crucial.
If White 2, Black lives with 3.
If White 4 at 5, Black lives with 4.
Black 1 is crucial.
If White 2, It results in a Ko with the moves Black 3 to White 6.
If White 2, Black lives with 3 to 7.
If White 2 at 3, Black lives with 2.
