Problem with Tsumego

I am struggling with a Tsumego on Tsumego hero. It is easy capture 200 and I just can’t get the solution. Can anybody help me out?

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You need to sacrifice a stone at some point.

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link to the problem mentioned by OP

Thanks for the link

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A hint will be a waste. Enlarge your search, try new move you didn’t check. Better try harder or put it aside and come back later.