: ( 504)
Black prevents two White eyes on the left side, and simultaneously occupies a liberty of White's group above.
:
White penetrates into Black's upper left corner, ...
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... and finally gets a ko. Black's group in the upper right is not alive yet, so this is a hanami-ko for White. White needs only two eyes on the left edge, and has the threats to , for example. The only real Black threats are , , and . All other threats, like (see below), and (approximate 15 points, and the life of the big Black group), are much too small.
:
The largest ko-threat, which White can ignore - but does not need to.
:
White saves the group on the left edge. The group on the lower edge has only one eye, so eventually White will have to destroy the hanezeki. Despite the associated loss, White wins by approximately 20 points.