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An answer is a microscopic mechanism that predicts $T_c(p)$ and the gap magnitude across cuprate families within a factor of order one and passes material-specific tests (isotope effect, pressure dependence, family dependence of $T_c,\\mathrm{max}$).","problem_ref":"1f1cdf9130b4f02912f9ac1aadbd10c2f51d4d3acbacda170fcbc080c3235748","references":"","settled_by":"A controlled calculation from a materials-specific model that reproduces $T_{\\mathrm{c}}(p)$ in several families, together with spectroscopy showing that the identified boson spectrum accounts for the measured gap function.","status_note":"","title":"What interaction binds electrons into pairs in the 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