In this tutorial, Russ Andersson demonstrates how to extend the length of an automatic tracker using supervised tracking in SynthEyes. He begins by showing an automatic tracker that is valid for only part of a shot and explains the benefits of extending it. By using the "shift 5" function to follow the 3D position of the tracker, Russ unlocks and converts the tracker to a match-type tracker. Utilizing the "search from solved" feature, he improves the accuracy and efficiency of the tracking process. By adjusting parameters and manually adding keys, he extends the tracker both forward and backward in the shot. Russ also demonstrates how to fine-tune the tracker, reducing the number of keys and improving overall accuracy. This method ensures a more precise and reliable tracking solution for complex shots.