Basic position: aim 30Aim: 30z is on the 4th cushion (left long cushion, 5th diamond); transferred to the opposite cushion it becomes x. The x–30 line passes tangent to ball 2, so the aim is 30. The cue ball hits ball 2 with a 5/8 ball fraction, goes from 30 to the left long cushion, the top short cushion and the right long cushion, comes to z and picks up ball 3. Spin: natural, spin 1, above the equator.
System 30 · Drill cards
Aim = 30 − 7.5 × (shift of point x / 10)
x–30 line not tangent to ball 2: aim 15Shift of point x (points): 20Aim: 15The x–30 line (dashed) passes below ball 2. The line tangent to ball 2 starts from 15 and goes to a point on the right long cushion 2 diamonds (20 points) above x. For a 20-point shift, subtract 2 × 7.5 = 15: 30 − 15 = 15. Because ball 2 is between the short cushion and the 2nd diamond of the long cushion, spin 1 is marked below the equator.