Matthias comments

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                                            Matthias

"We received the following error when we ran your code:" but no error is following

I don't know why the website reported an error but didn't show it. But maybe I can help with the code. Look at the constructor. In the function body it...

queen-attack test that prevents incorrectly accepted answers due to unsigned type.

The tests for this exercise come from the language-agnostic [problem-specifications](https://github.com/exercism/problem-specifications/blob/main/exercises/queen-attack/canonical-data.json). Any changes to those tests should be discussed in the [forum](https://forum.exercism.org/c/exercism/bugs-and-features/126) first where maintainers of all tracks have a chance...

queen-attack test that prevents incorrectly accepted answers due to unsigned type.

No worries. Sometimes even experienced C programmers trip over [the usual arithmetic conversions](https://en.cppreference.com/w/c/language/conversion#Usual_arithmetic_conversions). Thanks for wanting to help. Happy coding!