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An answer is a synthesized compound with zero resistance and diamagnetic shielding above 77 K at 1 bar, or a computational search with stated completeness showing none exists among a defined class.","problem_ref":"4b0b7a8cc6c7f5a51101a4588f34dbc37e1ff5869b80fce007c642c7c79ffdab","references":"","settled_by":"Synthesis and characterization of a predicted candidate with resistive and magnetic transitions above 77 K at ambient pressure.","status_note":"Calculations (2024) predicted $\\mathrm{Mg_2IrH_6}$ with $T_{c}$ above $100\\,\\mathrm{K}$ at ambient pressure; no superconducting sample has been reported.","title":"Is there a hydride superconducting above 77 K at ambient 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