Kanazawa Problem 58 / Solution

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White enlarges her eye space with 1, then makes eye shape with 3. Incidentally, White 1 - Black 2 makes a notcher with code 411WN.

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Continuation - variation 1

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Continuation - variation 2

White 2 at a also works.


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Failure at 3

The solid connection at 3 fails. It makes a 312NS notcher. How to attack this shape?

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Failure at 3 (wrong punishment)

Usually, there is death in the hane, but not here.

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Failure at 3 (punished)

This is the correct way to punish White: Black 1 strikes at the vital point, and if White 2, the hane kills.

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Failure at 3 (punished)

If White enlarges her EyeSpace, Black 3 and 5 prepare it to be almost filled with a killing shape.


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