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  1. Nf6+ gxf6
  2. Bxd5 Rxd5
  3. gxf6 Rc8
  4. Qg2+ Kf8
  5. Qg7+ Ke8
  6. Qg8+ Kd7
  7. Qxf7 (???)

That's not checkmate (black can play 7. ... Re8 now).
Please check the solution above! :)

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