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A problem whose interest lies in the sophisticated avoidance of dual mates.
By opening a rook guard on d5 the key 1.Sb5 threatens 2.Qxf4, and any move of the knight will defend. Simply lifting the knight from the board opens a bishop guard on e5, enabling four mates - 2.Sd6, 2.Qc4, 2.Rd4 and 2.Sc3, and to highlight this the composer has incorporated one move, 1...Sg6, which allows all four. The other knight moves contain a variety of effects which force one of the mates each time, giving the variations 1...Se2 2.Sd6, 1...Sd3 2.Qc4, 1...Sd5 2.Rd4 and 1...Se6 2.Sc3. The flight is followed by a pin-mate, 1...Ke5 2.Re1, and 1...Rf5 is met by the simple recapture 2.Qxf5.
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