Authors:
Solution diagram: HashimotoUtaro 9p
Variations: Dieter 1k, unkx80
The play at is the vital point.
The points a and b are miai now.
After , Black can almost fill White's eye space with a bulky five. White can do nothing to prevent that without turning her eye space into another dead shape.
There is a short discussion at KanazawaVariations46.
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