The answer is G18. Since it threats black's second eye, black must respond. After the sequence, black still alive with two eyes, but white got sente.
White can also directly capture black's E18 stone, but it'll be gote.
The problem came from 6th Korean Prices Information Cup, league D. Black is Kang Dongyun (9p) and white is Hong Minpyo (6p). Black won the game by 3.5 points.
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