With a skinny tree that needs a wedge to help direct the fall have you ever tried making your normal notch cut and then bore straight back thru the center of the notch so the saw tip comes out the back of the tree dead center. It gives a clear path for a wedge thru the hinge. Then drive a wedge in the back slot you just made. Make you back cut in two cuts, one on each side of the tree. On the first side start your cut about 1/2 or 1 inch above the wedge cut with the tip of the saw just over lapping the edge of the wedge cut. As you cut in make sure it over laps all the way to the hinge. Cut straight in to make a half back cut and one side of the hinge. Tighten the wedge. Then cut the other side the same way to finish the back cut and hinge. The tree won't tip back and bind your saw. You want to end up with a narrow strip of solid wood above the wedge and between the two back cuts. Pound in the wedge to fell the tree. The 1" vertical connection between the wedge cut and back cuts will split easy as the wedge goes in and the tree comes down.
gg

A couple of other variations:
https://www.youtube.com/watch?v=_ehdfLM1vVw
https://www.youtube.com/watch?v=BLkgWFh9lDs
Bruce
I gave this a try today, and it worked like a charm -- I owe you a beer Gordon! For anyone curious, here's a picture of the stump after the tree went over:
View attachment 452313
I think the cuts would be a little more surgical if I was using a smaller saw/bar (this was with a 20" bar on a Husky 562XP) but it still worked OK. There were a couple real meaty crack sounds as I hammered the wedge in at the end, and then the tree very gently went over.
I like this cut so much I sketched the steps in my logging notebook. The only bad thing about this trick is that I didn't know it sooner!
this is a great idea. I did the bore cutting for leaning trees so they won't split but never really consider the saw jam benefit. I usually just stick in a wedge on the back side as i cut my conventional cut but I think I will give this a try. Great idea Gordon.That is a great suggestion Gordon, thanks -- I will give that a try.