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Twin Problem 9: White to move and mate in 4 moves

G. Schories, 1929.

(White: Kh1, Qa8, Bf3, Bh8, Nh3, g4. Black: Ke5, Rf6, Nc5, b6, d4, d6, e6, g5, h4.)

White to move and mate in 4

Solution