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How do you describe someone who's answered a hard question without second thoughts?

closed as unclear what you're asking by user140086, Helmar, Chenmunka, Hot Licks, NVZ Nov 11 '16 at 13:45

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    A little context would help. You might mean something like "expert", "guru" or "savant". These describe the person, as your question literally says. You might be looking for an expression like: "he cut the Gordian knot". This describes the solution. You might be looking for something like the expression "snap judgement". – Hugh Meyers Nov 11 '16 at 10:48
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    Does the person answer correctly and completely or is the person maybe missing half the problem? – Helmar Nov 11 '16 at 12:44

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