I'm not a lumberjack, but I think I'm an OK feller. It's obvious which way most trees will fall, but some trees are more challenging. Last week I had a few challenges. The most interesting one was about 10 inches wide and about 50 feet high, with a curve to one side, then one to the other, and a small canopy of branches. I felt like I could drop which way I wanted. To make it more interesting, it was a windy day, swirling from different directions. I decided to drop it north, then I could drag it closer to the road. I made my undercut on the north side of the tree, as I was making my backcut, the tree swayed and grabbed my saw. Another sway and it was released, I pulled the saw out, stood back and watched as my backcut slowly narrowed and reopened. The wind was really playing with it and my head, I got to thinking it wanted to drop to the south, no back to the north, it was on the edge. First thing I did was move my truck, which I'm sure was safe, but I wasn't taking any chances, all the while keeping an untrusting eye on the tree. After watching it for a couple minutes it seemed to want to drop south, so I made a new undercut using the original backcut. Here I am with two notches cut out on opposite sides of a 50 foot tree with about 2 inches of wood holding it up. I stood there close to a minute, watching, wondering what the heck it was going to do, then I heard a snap and it dropped the way I originally wanted. Sadly, after all that, a lot of the center was rotten... LOL...