Yeah, so I've been splitting wood for many years but had never run across any Elm before. I've heard it's tough to split but I would have never believed just how tough it really is. Long story short, after producing several "splits" that looked more like hairy stringy balls of crushed wood, I cut an X in the top of the rounds to about the depth of my chainsaw bar, and then they popped right open. This elm better burn good in two years though!