The most popular type of NFL betting is spread betting, and in this guide we explain how NFL We will explain what betting against the spread means below. Now if the Cowboys were to win by 4 points, lets say , the Cowboys have. The point spread levels the playing field, making betting on either the favorite or the underdog equally attractive. Either the favorite has to win by the margin. This piece gives you spread betting explained and examples of how the odds work. Big Week Of Football Lined Up! - order now But if you bet on Pittsburgh against the spread, you lost. Sports Picks on basketball, football, and baseball!.