Il a joué au football dans la cour.

English Translation

He played football in the yard.

Gemini says:
"While “cour” translates to “yard,” it specifically refers to a paved area or an enclosed courtyard (like a school playground or a driveway).

La cour: Use this if the yard is paved, concrete, or an enclosed patio.

Le jardin: Use this if the yard is grassy or has plants/flowers (like a typical suburban backyard)."

What it says is correct; we lack enough context to know whether it should be translated one way or the other.
To justify my comment being a bit more than just “Gemini is right”, I’ll say that, when I read the sentence I first though of a child playing football. And one place where children would usually play is the (school)yard, which would be translated as “la cour (de recréation)”

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