How does Dr. Dave’s peace-sign technique work?
See the following videos for complete information and demonstrations:
- NV B.43 – Cue ball position control stun, roll, and draw reference lines
- NV B.44 – Dr. Dave 30° rule peace-sign hand calibration
FYI, “90° and 30° Rule Follow-up – Part V: the final chapter” (BD, June, 2005) wraps up a series of 12 (a year’s worth!) of articles dealing with the 90 and 30° rules. Diagram 2 of this article (see below) shows how you should move your hand to adjust for speed. It is fairly self-explanatory, but you can see the article for more details. The 30° rule applies for a wide range of shots. For more info, see when the 30° rule applies.
The peace-sign technique can also be applied to draw shots using the trisect system.
An alternative way to visualize the natural-angle direction is to imagine the mirrow image of the ghost-ball on the back of the object ball. For more info and illustrations, see: “Back-of-the-Ball Aiming,” BD, September, 2016.
How can you tell if your peace-sign is the correct angle?
See NV B.44. Also, here’s a template useful for learning how to apply the 30° rule accurately. The template can be used to help you train and calibrate your hand peace-sign (see “The 30° rule: Part I – the basics” – BD, April, 2004 and “90° and 30° Rule Follow-up – Part V: the final chapter” – BD, June, 2005).
One way to calibrate or check your peace sign at the table is to use your opposite hand index finger as a ruler to measure how much the tips of the “V” fingers should be spread. Using the 30° template or a 30-60-90 drafting triangle (available at office and arts and crafts stores), one can form the peace sign of the correct angles and then place the opposite-hand finger over the finger-tip gap, with the fingertip touching the tip of one of the fingers. Note where the second finger is relative to the other opposite-hand finger (e.g., just below the main knuckle, or at a certain wrinkle). Then (e.g., when you are playing), you can check your peace sign spread by recreating the same finger tip positions on your opposite hand.
Do people really use the 30°-rule peace-sign at the table?
If one has a critical shot close to a scratch, requiring precise caroms, needing ball break-up or avoidance, or with tight “traffic” of balls to negotiate, a well-calibrated peace sign can be extremely useful, allowing one to predict with confidence nearly exactly where the cue ball will go. One can adjust the peace sign slightly for the cut angle using the 30° rule angle template for help. One can also adjust for speed, as shown in “90° and 30° Rule Follow-up – Part V: the final chapter” (BD, June, 2005). Well-calibrated fingers can be much more accurate than intuition-based visualization.