How to Calculate Using a Simple Example
Instructions
Estimate the arrival on the 3rd rail. In our example it is 30.
Choose a possible start value and insert it into the formula. Start rail 50 - 3rd rail 30 = 1st rail 20.
The result of the calculation is the value on the 1st rail. Now imagine a line from the chosen start value (50) to the value on the 1st rail (20). If you realize, that this line is far away from the cue ball, you try another start value and insert it into the formula.
If the line is close to the cue ball (less than 5 cm), you just shift it parallel, till you cross exactly the center of the cue ball. The point where this line reaches the first rail is your aiming point.
