So what happens when that sheet isn't there? In this JR Gold prep league, they're allowing adults to bowl with the kids to simulate some tougher competition, and also to teach them. They have a little meeting with the kids before the league, show them the graph, talk a little about the shot, and then we go bowl. The guys running the thing were a little miffed at me at first because I wasn't playing the lanes the way the sheet said they were supposed to be played. I got several questions of, "Why are you playing inside when the sheet says the line is outside?" My reply was always, "Because I want to knock the pins down." Once they started seeing how much higher my scores were than everyone else's, they changed their thinking a bit. Plus all these shots are going down on 15 year old Anvilane, a couple of the houses at Jr Gold are WOOD. If you pay any kind of attention to the pattern or the graph down there, you're going to be completely screwed.
Bottom line, you can have your graphs and your sheets that give you all this information, and I'll just take your money.