24.Nd8+ Kh8 25. Qe7!, and Black resigned because the position is lost. For example, if 25… Re8, then 26. Qxe8+ Nxe8 27. Rxe8 leads to mate. If 25… Rg8, then 26. Nf7 is mate. And if 25… Rxd8, then White has a significant material advantage after 27. Qxd8+ Ng8.
You are all set!
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