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Whether a sharp critical point separates these two behaviours in large samples is disputed.","posed_since":"2018","precise":"Under athermal quasistatic shear, poorly annealed glasses yield smoothly (ductile) and well-annealed glasses yield through a macroscopic stress drop (brittle). A 2018 scenario maps this onto a random-field-Ising-like critical point at a preparation temperature $T_p,c$. Determine whether this critical point exists in the thermodynamic limit in $d = 2\\ \\text{and}\\ 3$, and its universality class, or whether brittle failure occurs for every preparation once the system is large enough.","problem_ref":"e2da5994caa64670ae036d6e15030b428466154aed0a947fe9457e18c2399b3e","references":"","settled_by":"Finite-size scaling of the stress-drop distribution and susceptibilities across preparation temperature for systems large enough to settle the limit, consistent with an elastoplastic or field theory.","status_note":"Finite-size studies since 2020 disagree on whether the ductile regime survives in the thermodynamic limit (2026).","title":"Is the brittle-to-ductile change in glass yielding a critical 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