Mornin' all.
That big old pine was fun, and a fair amount of prep work. I had little room to play with, lots of breakable stuff close to the layout. I needed to not only be accurate, but control how the tree fell, and what the butt did going off the stump. It's tough to see in this crappy old scanned in photo, I did what little I could do with the photo editor. Anyway, I used a step cut, something similar to what I used in my redwood falling days. I wanted the tree to go over slow and easy, contacting the stump only when it was nearly horizontal. Instead of just two cuts for the undercut, I did four. A downward angle for the first cut, dropped down a foot or so, made a level cut, bored in to remove the block, then put in a "snipe" in the direction of fall. It fell without twisting, and jumped about three feet from the stump. I had minor nightmares about the butt rolling over and tagging the chimney. As for the holding wood, there was an even 3 inch strip for the first 2/3s, and a rectangular block of about 8 inches thick was left on the chimney side. I managed not to hit anything with the tree, but I hit a waterline while driving my sighting stake in.