Kinda off the beaten path, apologies, but interesting story for ya... Guy who taught me how to play straight pool was a world-class ping-pong player who dabbled in billiards!! We sent him to play the Chinese back in the 70s!! He was that good. You old timers might now of whom I speak. His knowledge of spherical collision and rotation was second to none!! When it came to break balls, throws, reading the rack, english transfer across multiple balls, etc, this guy knew his stuff. I consider myself fortunate to have had his tutillage so early in my playing days. Helped me develop a love for this game like no other. Except perhaps Rollin the Cheese on the 9. Lol.