I remember seeing a YouTube vídeo of André saying that it’s possible to take the Back using a near side underhook, when in top side control. I can’t seem to find this, tried searching under side control and back takes, but no luck… anyone with any tips on how to search for it? Of course maybe there isn’t a video about this at all, but I think it’s worth asking, thx!

Lucas Lepri has an instructional called Precision Back Takes covering this subject. Roger Gracie instructional about side control has something similar.