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TR-MO 2021 Problem 3

    A circle Γ\Gamma is tangent to the side BCBC of a triangle ABCABC at XX and tangent to the side ACAC at YY . A point PP is taken on the side ABAB . Let XPXP and YPYP intersect Γ\Gamma at KK and LL for the second time, AKAK and BLBL intersect Γ\Gamma at RR and SS for the second time. Prove that XRXR and YSYS intersect on ABAB .

    Dataset text AI-MO AoPS. Quoted with source.

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