Reference position: Arrival 20Arrival: 20Aim: 10Aim = 20 ÷ 2 = 10: 1 diamond beyond the frozen ball.
Frozen ball system (long–short–long) · Drill cards
Aim = Arrival ÷ 2 (aim 0 = position of the frozen ball)
Arrival 40Arrival: 40Aim: 20Aim = 40 ÷ 2 = 20: 2 diamonds beyond.
Arrival 30Arrival: 30Aim: 15Aim = 30 ÷ 2 = 15: 1.5 diamonds beyond.
Arrival 10Arrival: 10Aim: 5Aim = 10 ÷ 2 = 5: half a diamond beyond.
Ball 2 frozen, Arrival 40Arrival: 40Aim: 20Aim = 40 ÷ 2 = 20: 2 diamonds beyond ball 2. The cue ball touches ball 2 very close to the cushion; the same calculation applies.
Ball 2 frozen, Arrival 20Arrival: 20Aim: 10Aim = 20 ÷ 2 = 10.