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A problem whose solution is a little out of the ordinary.
Solution: The key, 1.Sf4+ gives the black king 5 flights, four of them giving check. Wherever he goes 2.Se6+ follows, and if the king captures on e6 White exploits the clearance of the line f1 - c4 to mate with 3.Bd5+ Kxd5 4.Qc4. Other variations are 1...Kf5 2.Se6+ Kg6 3.Be4+ K any 4.Qh3, or 2...Kg4 3.Qf4+ Kh5/Kh3 4.Qg5/Qg3, and 1...Kf7 2.Se6+ Ke8 3.Qf8.
Peter Niehoff: If the knight is removed from d3 White can mate by Bd5+ and Qc4. The harmful piece is spectacularly removed by a foreplan with a sacrifice to draw the king back to e6.
Jacob Hoover: Flight-giving key, battery plays, pure mates. A clever problem.
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