Ball System (볼 시스템)Ball fraction + spin calculation for the around-the-side shot (옆돌리기)

In Korea it is one of the best-known systems for 옆돌리기 (around the side: after hitting ball 2, the cue ball goes to the nearby long cushion, then to the short cushion and to the opposite long cushion, going around the side of the table). The result is not an aim point but the sum of ball fraction and spin. The same sum can be reached with several different fraction–spin combinations; the player chooses the combination that best avoids the kiss and suits the position. That is why it is also very useful for learning the relationship between fraction and spin.

When? When ball 2 is close to the long cushion the cue ball will go to first, and the cue ball, after hitting ball 2, has to go to that long cushion, the top short cushion and the opposite long cushion (3rd cushion) to make ball 3. As the 3rd-cushion value grows (5 and above), accuracy decreases.