This works but you will have to cut the stump to ground level.
first drill loads of holes in the top of the stump so the holes are below the surface of the soil, then put some fire lighters on the top of the holes and leave for a week so the fire lighters soak into the stump,them after a week put some more fire lighter on to of the stump and light them,it does work but can be a bit smokey,and it will burn for a couple of days.