← Three-times-angle rule (draw)

Three-times-angle rule (draw) · Drill cards

Deflection angle = 3 × cut angle (cut angle 0°–40°)

Reference position: half ballBall fraction: 1/2Deflection angle (°): 90Cut angle 30° → the cue ball turns 90° from the cue line.
3/8 ball (limit)Ball fraction: 3/8Deflection angle (°): 116Cut angle 38.7° → 116.0°. The rule holds up to a cut angle of 40° (3/8 ball) at most.
5/8 ballBall fraction: 5/8Deflection angle (°): 66.1Cut angle 22.0° → 66.1°.
3/4 ballBall fraction: 3/4Deflection angle (°): 43.4Cut angle 14.5° → 43.4°.
7/8 ballBall fraction: 7/8Deflection angle (°): 21.5Cut angle 7.2° → 21.5°.
Full ballBall fraction: Full ballDeflection angle (°): 0Cut angle 0° → the cue ball comes back along the cue line (0°).