Snapback Problem 13 / Solution

Sub-page of SnapbackProblem13
[Diagram]

White dies

After B3, a or b kills White.

Is W2 white's best defense? See below for options.


Things that don't work.

[Diagram]

White lives

White lives and saves the marked stones with either a or b.

[Diagram]

White lives

White lives with either a or b.

[Diagram]

White lives

White lives with either a or b.


In the original solution, white plays W2 @ a. However this loses, as shown above.

[Diagram]

Black to move, White lives?

I propose W2, it secures an eye, and gives white the option to make another eye by playing a, b, or c. But it is black's turn, how does black kill now?

Obviously white @ a secures two eyes for white, so perhaps black playes there first.

[Diagram]

White lives? Fig 1

W4 looks promising (but actually fails)

[Diagram]

White lives? Fig 2

To continue from figure 1, B5 places the white group in atari . White @ c kills the black stone....

[Diagram]

White lives? Fig 3

But then we are back to a basic snap back position. Black kills the 5 white marked stones by playing @ a. So white dies even in this position.

[Diagram]

White lives? Fig 3

White's only other try is at W4 which is self-atari.


So white really is dead, sorry I did not see that. Perhaps the above options are obvious, but probably not to all.


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