Dr. Dave, I have been practicing the 2-rail parallel line kick shots you show in your book on pages 229 & 230 and demonstrated in NV 7.9. It works fine if I set up the balls similar to what you show in your book but I am having difficulty envisioning the same shot from other set ups. I don’t think I fully understand how to determine the center line between the 2 parallel lines. Can you elaborate on this idea?
The following video, from Vol. III of the Billiard University (BU) Instructional video series, demonstrates the system:
Unfortunately, the action of this shot depends on english, shot speed, and table (especially cushion) conditions. Obviously, when practicing, you need to try to use consistent english and speed on a given table to see how the cue ball responds at different angles.
from Patrick Johnson:
You have to aim a little closer to the corner than the measurement suggests – experience will tell you how much, depending on the angle to the first rail and the cleanliness of the table/balls.
In this drawing the blue line is the measured track, but the actual track will look more like the red line:
… the “Amazing Double-mirror Image Method” or ADIM for short … is explained on the second page of http://www.sfbilliards.com/articles/2004.pdf (July). Mostly, it gives you a very easy way to put up a target ball exactly where the real ball would appear for a perfect mirror system. … This lets you see immediately how pitifully awful the two-rail mirror system is, but it also allows you to try to find out where it does work and maybe how to modify it so it works for more cases.