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BALTIC-WAY 2022 Problem 11

    Let ABCABC be a triangle with circumcircle Γ\Gamma and circumcentre OO . The circle with centre on the line ABAB and passing through the points AA and OO intersects Γ\Gamma again in DD . Similarly, the circle with centre on the line ACAC and passing through the points AA and OO intersects Γ\Gamma again in EE . Prove that BDBD is parallel with CECE .

    Dataset text AI-MO AoPS. Quoted with source.

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