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A three-mover which was described by the column editor Brian Harley as “Loydesque”, a reference to America’s Puzzle King, Sam Loyd. It should prove a fair challenge for solvers.
Solution: It is not immediately obvious that the queen must mate at f1, and the question arises of where to put the rook. The correct key 1.Rb3, threatening 2.Qf5 and 3.Qf1 (if 2...Qxf5 3.Bxf5), is determined by Black’s defence 1...d4, which prepares to meet 2.Qf5 with 2...d3, unpinning the g-pawn. The prevention of a check at a4 allows White to continue by unpinning the queen, 2.Se6, threat 3.Sg5, with variations 2...Qxe6 3.Qxe6 and 2...Qf5 3.Bxf5. With the rook elsewhere, Black would have the defence 2...Qg8! The remaining defence 1...e4 unguards f4,allowing 2.Sxh5 threat 3.Sf4, and the queen will be captured if it moves down the diagonal.
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