The Subterranean Addition by Stephen Hobbs

Credit : Technical Tool Box by Stephen Hobbs vol.1
Back ground : He made this as variation of Alex Elmsley's Pick of the Litter. (Collected Works of Alex Elmsley vol.2, p.238) And Alex Elmsley also had made it as variation of Audley Walsh's The Audley Walsh Coincidence (The JINX, No.21, June 1936, p.122) while Audley Walsh also had made his idea as variation of the Vernon's Strip-Out addition
Stephen Hobbs didn't like the aspect of turning the body to the left in Alex Elmsley move. So the way he fix is making selections Angle jog.
(I'm not sure it does fix the original problem, or the thing in the original is the problem. But I felt interesting)
And also he taught some of the ways to get rid of that top X card. This video is one of the ways he solve that.