This is another one of my favorite drills, I recommend it to many of my students.  I learned this from Jerry Briesath when I lived in Wisconsin, he is one of the top instructors in the country and I highly recommend checking out his pool school and "A Pool Lesson" 3 DVD set, you won't be disappointed.

This is tougher than playing the traditional ghost and really works on your patterns.  It's a great drill to add to your regular practice routine.

As always, feel free to message me with any questions or comments.  Enjoy!