December 14, 2009
Black 1 is crucial.
After White 2 and 4, Black creates a Ko with 5.
If Black 5 at 2, White 5 kills Black.
Black 1 is the vital point.
If White 2 and 4, Black kills White with the moves to 7.
If White 2, Black 3 kills White creating a four-point Nakate.
