I play mostly one hole. I use the diamond system quite a lot. Each table banks differently, so you just need to see if the particular table is banking short, long, or right on the money. The system has gotten me out of trouble a lot when trapped. It's nice to have some confidence when you are trapped and attempting a 2 or 3 rail kick with the cue ball to get safe, or just not sell the world. The system works better than just an outright guess over the long run. Is it perfect? No, but once you figure out how the table banks, it is very, very close.