Kanazawa Problem 31 / Solution

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[Diagram]

White lives

White 1 makes an eye at a and makes miai of b and c for the second eye. It is clearly the vital point.


[Diagram]

Wrong 1

White 1, 3, 5, 7 and 9 all serve the same purpose: enlarging the eyespace, which is generally a good idea. Black occupies the vital point at 2 and prevents White from making 2 eyes. I seems as if we are heading for a seki (see next diagram) ...

[Diagram]

Wrong 1 (continuation)

If White plays 1, then after all the circled liberties are filled, Black can give atari at a, White protects at b, and her eyespace is almost filled with a farmer's hat.

If White plays at a herself instead of 1, eventually her eye space will be almost filled with a bent three.

So, White is dead either way.


[Diagram]

Wrong 2

White 1 makes an eye where there is already one. It is not vital. Black can now kill by playing either of 2, 3 or 4. Any of those three moves makes miai of the other two to kill White.

Choice 2 is shown. After 8, a and c are miai to keep White at 1 eye. Remark: once again, without the cutting point at c, there would be the possibility of seki.


Problem 32
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