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The task is a theory that predicts it for every atom and resonance, including narrow ones.","posed_since":"2011","precise":"For identical bosons near an isolated s-wave Feshbach resonance with van der Waals length $r_{\\mathrm{vdW}}$, resonance strength $s_{\\mathrm{res}}$ and background scattering length $a_{\\mathrm{bg}}$, predict a_-^(1)/r_vdW, the scattering length of the first three-body loss resonance. Answer: a model reproducing all measured values (Cs, K-39, Li-7, Rb-85) within experimental error, including the deviation from -9.7 for $s_{\\mathrm{res}} < 1$.","problem_ref":null,"references":"","settled_by":"A multichannel three-body calculation that matches every measured a_-^(1) within error bars, plus a new measurement at a narrow resonance that it predicts in advance.","status_note":"Theory traced the value to a universal three-body barrier near $R \\sim 2 r_{\\mathrm{vdW}}$ (Wang et al., PRL 2012), but measurements at resonances of different widths scatter by roughly 15 to 30% around the universal value.","title":"Predicting the three-body parameter across Feshbach resonances of any 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