Heise method

The last 3 corners must be solved simultaneously, without destroying any of the solved part of the cube. Considering that the "solved part" is almost everything, that's quite a challenge! One way to maneuver just a few select pieces without affecting anything else is to use the principle of commutators and conjugates.

It so happens that the laws of the cube force the last three corners into one of the following two situations:

1. The 3 corners are not in the correct positions. In this case you should apply a corner 3-cycle.
2. The 3 corners are in the correct positions but oriented the wrong way. In this case you should apply a corner twist.

And that is that :-)