40% rule

What is 40% rule?

40% rule meaning principle used to judge how much tip offset is required to create “gearing outside english” for a given cut angle. The tip must be offset 40% of the distance between the center of the CB and where the “line of centers” intersects the edge of the ghost ball.

 

reference: billiards.colostate.edu: Glossary of Pool and Billiards Terms and Phrases

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