What is the Diamond system in pool?

I'm trying to learn how to bank better, I saw something online about the diamond system. It said something about each diamond has a number and you add them together to hit the other number; what is that?What is the Diamond system in pool?I thought there was a goofy cartoon to explain this but all I can find is donald duck in mathmagic land explaining the diamond system for three cushion billiards.

I was sure I saw goofy using something more like a grid so that if you're cue ball was at 2,1 you would say that is at 1, 2-1=1 and if the object ball was at 7,2 that would be at 9, 7+2=9 you would aim at diamond 5, (9+1)/2=5. But I can't find that cartoon or remember where you count from and add or subtractWhat is the Diamond system in pool?The diamonds are placed on tables to give geometric points of reference when shooting bank shots and describing areas of the table(like the kitchen, etc.). Each table is broken down in 28 "quadrants" or sections. Learning the diamonds(spots) can be a daunting task. The easiest way for a beginner to learn them is to set the cue-ball at one diamond and hit it toward another diamond. Watch where the cue-ball goes and make a drawing which describes the path of the ball. Using different combinations of diamonds to learn different bank shots. Many times the cue-ball isn't in line between 2 diamonds, so you need to learn how to make the adjustment. An important principle to remember is that a ball deflects off a rail at the same degree that it approaches a rail, unless the ball is spinning or driven hard. There are books that teach the concept of the diamonds, but each table has slight variations. This is why I suggest trying to learn them on your own.What is the Diamond system in pool?There are different systems for different types of banks. Below are some links to a few explanations that are much better than me trying to type them out. The diamonds have different numbers depending on what type of shot you're trying to hit. You really need to practice these in order to try to understand them. Email me if you have more questions.