: ( 437)
This move is too cautious, and becomes the losing move.

:
This is a very fascinating idea of Michael Redmond to generate a ko-shape in the corner.

: (A 452)
If will not really help Black to ignore White's ko-threat.

:
It will be shown in YoungSun's sub-variations ( 442) that Black is unable to win a ko in the top left corner. So let us simplify, and shorten, the matter here. Black secures life for his group in the corner, what he else must have done after White won the ko-fight.

:
White eventually connects the ko. We apologize for any potential mistake in the ensuing endgame, but it should become evident that White will get a sure win.

White wins by seven points.