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CZ-SK-MO 2023 Problem 3

    In acute triangle ABCABC let HH be its orthocenter and II be its incenter. Let DD be the projection of point II onto the line BCBC and EE be the reflection of point AA in point II . Further, let FF be the projection of point HH onto the line EDED . Prove that points B,H,FB, H, F and CC lie on circle.

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Czech-Slovak Mathematical Olympiad 2023 official paper, page 1.

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