I used my plastic ball the first game and bowled a 196. In warm up I found the lanes were kind of dry. I was throwing over the 5 board and the ball was hooking real nice into the pocket. The second game I went to my urethane ball because the plastic started leaving 7 and 10 pins. The switch worked out because I bowled a 211. By the third game I started running out of stamina and being almost 79 might have something to do with that. I started out with two spares and went down hill after that and posted a 115 game. Now how is that possible? I finally made an adjustment but it was done way too late. I was leaving single pins and missing them by a hair or I left a wide split I couldn't pick up. It only goes to show that the game of bowling can turn on you.