White enlarges her eye space with 1, then makes eye shape with 3. Incidentally, White 1 - Black 2 makes a notcher with code 411WN.
This is the correct way to punish White: Black 1 strikes at the vital point, and if White 2, the hane kills.
If White enlarges her EyeSpace, Black 3 and 5 prepare it to be almost filled with a killing shape.
Go to Problem 59
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