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Dear Caroline, the guide will help you, identify the edge of your graph that you want to decide, align the edge of the guide (in red) with it et voilà, the guide tells you which one of the two threads is going over, which one is going under. A very common mistake is that you can no longer identify or see the edge because you erased it or because you drew the link in the same color. Be aware that the Irish monks never erased these edges, they simply covered them with paint. So draw your graph in ink and don’t erase it, place the crossings (with an erasable pencil) at the middle of it and (...)