1.Nf8
It turns out the knight wasn't really pinned after all, as White
threatens mate (Rg8), made possible because of the knight interfering
with the black rook's defense of g8.
1...Rxf8
Black can also try 1...Qxf8 but 2.Rg8+ removes the guard of the f6
square.
Analysis Diagram: after 2.Rg8+
2...Qxg8 3.Qf6+ Qg7 4.Qxg7#
2.Rg8+
Black's reply is forced, and leaves f6 unprotected.
2...Rxg8 3.Qxf6+ Rg7 4.Qxg7#
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