Reading the board…
Rosetta Code for B-rep kernels. Each case describes a solid in words and gives its volume and area as closed forms. Each kernel builds it in its own idioms, and every result is graded the same way; a refusal ranks above a wrong answer, and no kernel ranks above another. Open a category or a kernel for its cases, or a case for its drawing, every kernel's result in 3D, and every kernel's code.
Reading the board…