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NV B.67 – The trisect system for draw shots, from VEPS I

By • Feb 25th, 2019 • Category: Billiard Tips

Free Billiard Video – http://dr-dave-billiards.com

Dr. Dave and Tom Ross show how to predict cue ball direction with pool draw shots using the trisect system and peace-size technique. The rule is useful to avoid scratches, get position, aim billiard shots, and plan break-out and avoidance shots. This is an example shot from Disc I of “The Video Encyclopedia of Pool Shots” (VEPS). The VEPS series includes over 750 shots in 50 different categories, with over 250 “gems” of the game. The series is the most comprehensive collection of pool shots ever published. Disc I covers basic shot making and position control.

http://dr-dave-billiards.com

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4 Responses »

  1. The trisect system applies only for a “good action” draw shot, which is defined as the amount of the draw that creates 90-degree deflection for a 1/2-ball hit. As you point out, it is possible to draw more than this with “full draw.” It is also very easy to draw much less than this. The trisect system is simply a reference that is very easy to visualize. However, you need to be able to adjust relative to the reference (as is demonstrated on the DVD).

    Thank you for the comments,
    Dr. Dave

  2. @DrDaveBilliards
    This advice might be helpful for playing extremely general zone-position in pool, but seems too rough for ball-to-ball play. More precisely, full-draw carom angles for cuts up to about 40 degrees hovers near 2.3-2.4x of the cut angle (for almost the entire range!). Using 3x the angle as an approximation is too far off base to use as a guide to score on distant targets (balkline) or for drawing the ball onto a fine line (in 3-cushion)- I fear it might lead to stroke confusion.

  3. The DVD has much more detail than this single demo clip. It is made very clear that the trisect system only applies for cut angles up to about 40 degrees, which is about the largest angle most people can form comfortably with a stretched peace sign. So if you can measure the cut angle with your peace sign, the method works very well.

    continued …

  4. As you know, it’s only accurate for cuts near 1/2-ball hit (30 degrees).

    For example, the trisect system predicts 180 degree draw (i.e. straight along the aim line for a 60 degree cut (1/8-ball hit). That’s obviously wrong, and is 40 degrees off!

    Also, fuller hits up to ~3/4-ball are more like 4x the cut angle instead of 3x.

    If you’re going to use approximations that are only valid in a certain range, why not tell the viewer?

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