White to move and mate in 4.
Solution:

! The position is a smothered mate pattern. Nf7+ Rxf7 Kg8 Nh6++ Kh8 Qg8+ Rxg8 Nf7# or another variation Nf7+ Rxf7 Qd8+ Qe8 Qxe8+ Rf8 Qxf8#

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