If we can get a capper to predict which way the lines will move during the course of the day, then we could get a good shot at winning a middle. For example if GSW opens at 208 and the capper says it should move ( with a probability of 75%) to 212 then we could bet the over at 208 and the under at 212. We would have a 4 point middle. If we could catch 25% of our games then we show a nice profit. usernametaken