How do diamond systems work?
For shallow angles into the rail, where the OB is fairly close to the rail, the contact-point mirror system for shallow-angle, rolling kick shots works well.
The most famous”diamond system” is the Corner 5 System for aiming three-rail kicks off long rail.
Another famous diamond system is the Plus System for two-rail kicks off short rail.
Spot-on-the-wall kicking systems offer an alternative to formula-based systems.
Here’s an article on Jimmy Reid’s 3-rail systems.
Liberty Games has a nice online illustrated summary of diamond systems here: Introduction To The Pool Diamond System.
Here’s a simple summary with examples, from Marcel Elfers, showing how to apply the Corner-5 System and Spot-on-the-Wall Systems to 3-rail kick shots. This document numbers the diamonds in 10’s instead of the standard 1’s to eliminate the need for fractions or decimals (e.g., 15 vs. 1 1/2 or 1.5).