Indeed, I updated my comment once I noticed they weren't the same after all. It seems like the kind of thing he'd've come up with a prefix word (like switchback) for, but I can't find one, and Helical does seem apt (though I expect he'd have called them helical girl‐/boy‐/doublescouts rather than rooks/bishops/queens)
Indeed, I updated my comment once I noticed they weren't the same after all. It seems like the kind of thing he'd've come up with a prefix word (like switchback) for, but I can't find one, and Helical does seem apt (though I expect he'd have called them helical girl‐/boy‐/doublescouts rather than rooks/bishops/queens)