Return shot: diamond 1.5 back to 5.5

Difficulty ●●●○○ · Free · 02/10/2026

Cue ball hits the object ball then uses reverse english to come back on the same side.Diagram: 3C engine, geometry verified

How to play it

Path. bottom long rail → right short rail → top long rail. Rail contact points are built by the mirror rule (angle in = angle out).

Execution. No english or very little, so the path stays closest to the mirror; medium speed.

Adjust. Running english makes the ball go longer than drawn; reverse english shorter. Humid room or old rails: shorter.

Drill. Place the balls on the diamonds, shoot ten times, record how many land within half a diamond.

Điểm băng = giao của đường từ bi tới ảnh gương của đích qua băng đó.

Angle in = angle out, no english. Used to understand basic geometry and as the baseline for corrected systems.