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invalid problem set
Problem 10164
life and death
Giant, Xuan Xuan Qijing

+1
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This is a problem from the xuanxuan qijing. I've included as many variations as I could think of. At the end there are just too many possibilities however. The part of the board not shown is completely empty. So no ko threats there.

A hint is that this problem only works on a 19x19 board.

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