Reference position: 3 + 2 = 5Reference line: 3Arrival: 2Fraction + Spin: 5Ghost ball on reference line 3, arrival 2 (1 diamond), slant 0. Sum 5; the diagram uses 3/8 fraction + spin 2 (5/8 + 0, 4/8 + 1, 2/8 + 3 and 1/8 + 4 give the same sum).
Ball System (볼 시스템) · Drill cards
Ball fraction + Spin = Reference line + Arrival + Slant
Arrival close to the corner: 4 + 1 = 5Reference line: 4Arrival: 1Fraction + Spin: 5Ghost ball on line 4, arrival at half a diamond (1). Slant 0 → sum 5. The diagram uses 4/8 (half ball) + spin 1.
Plus slant: 4 + 1 + 2 = 7Reference line: 4Slant (half diamond = 1): 2Arrival: 1Fraction + Spin: 7Same ghost ball and arrival as b2, but the cue ball is on the turning side: the left end of the slant line is one diamond higher → +2. Sum 7; a fuller hit is needed. The diagram uses 5/8 + spin 2, with a hit at medium height because the fraction is more than 4/8.
Minus slant: 3 + 4 − 1 = 6Reference line: 3Slant (half diamond = 1): -1Arrival: 4Fraction + Spin: 6Ghost ball on line 3, arrival 4 (2 diamonds). The left end of the slant line is half a diamond lower → −1. Sum 6; it can be played with 2/8 + 4, 3/8 + 3 or 4/8 + 2. The diagram uses 3/8 + 3.
Minus slant: 2 + 3 − 2 = 3Reference line: 2Slant (half diamond = 1): -2Arrival: 3Fraction + Spin: 3Ghost ball on line 2, arrival 3 (1.5 diamonds). The left end of the slant line is one diamond lower → −2. Sum 3; the diagram uses 2/8 + spin 1. Because the cue ball is already heading in the turning direction, a thin hit is enough.