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Solution: The key, 1.Kh6, puts a guard on g5 and threatens 2.Sf6+ Kf4 3.Sh5. In three well-matched variations a battery opens and interferes on the line of a second battery, leading to a switchback mate in one of the sub-variations. 1...Rd3 2.Sg6+ Kxf5 3.Se5 or 2...Kf3 3.Se3; 1...Rf3 2.Sc6+ Kxd5 3.Se5 or 2...Kd3 3.Rxd4; 1...Bg4 2.Se7+ Kxe5 3.Sd5 or 2...Kf4 3.S5g6.
Peter Niehoff: Elegant switchbacks and battery play.
Jacob Hoover: I really enjoyed this one.
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