Separation angle of billiards hitting

Separation angle in case of longitudinal forward rotation of the cue ball<90 ° in case of no longitudinal rotation of the cue ball=90 ° in case of longitudinal reverse rotation of the cue ball>90 °
Therefore, judge the separation angle of billiards hitting:
(1) When using the high bar method, the separation angle must be less than 90 ° because the cue ball always rotates longitudinally forward
(2) When using the middle stick method: the cue ball touches the target ball in the sliding process, at this time, the cue ball does not rotate longitudinally, and the separation angle=90 °
2. The cue ball changes from sliding to rolling forward and then touches the target ball. At this time, the separation angle is<90 °
(3) When using the low bar method: the cue ball touches the target ball in the longitudinal counter rotation, showing the pull rod effect, and the separation angle>90 °
2. The cue ball changes from longitudinal counter rotation to sliding when it touches the target ball. At this time, the cue ball does not rotate longitudinally, and the separation angle=90 °
3. The cue ball changes from longitudinal counter rotation to sliding, and then changes to longitudinal forward rotation when it touches the target ball, with separation angle<90 °
The practice of separation angle mainly refers to the manipulation of strength and angle. A special sphere requires a certain rod method. I believe that more practice will definitely improve.