From 35 to 30 → symmetric pointAim: 30Start 35 (3rd diamond from the top on the left cushion). A ball played to 30 with 2 tips of spin comes back to the 3rd diamond from the top on the right cushion.
30 Symmetry System (30 대칭 시스템) · Drill cards
Aim = 30 − 5 × (desired lengthening, diamonds)
From 40 to 30Aim: 30Start 40 (2nd diamond from the top). Arrival at the 2nd diamond from the top on the right cushion.
From 45 to 30Aim: 30Start 45 (1st diamond from the top). Arrival at the 1st diamond from the top on the right cushion.
From the short cushion: from 90 to 30Aim: 30Start 90 on the top short cushion (3rd diamond from the left). Arrival at the symmetric point on the top short cushion: 3rd diamond from the right.
One diamond long: aim 25Desired lengthening (diamonds; minus for shortening): 1Aim: 25Start 40; ball 3 is one diamond beyond the symmetric point (higher up). Aim half a diamond towards the corner: 30 − 5 = 25.
One diamond short: aim 35Desired lengthening (diamonds; minus for shortening): -1Aim: 35Start 45; ball 3 is one diamond short of the symmetric point (lower down). Aim half a diamond towards the middle: 30 + 5 = 35.