Over the past 5 completed NFL season, the twelve most common margins of victory in order of most frequent first were: 3, 7, 10, 4, 6, 14, 2, 21, 17, 1, 8 and 5.
This means in a six point teaser the goal is to find and tease: underdogs +1.5 to +2.5 (to +7.5 to +8.5) and favorites -7.5 to -8.5 (to -1.5 to -2.5) because you’re going what would be a loss on point spreads three and seven, to a win in other words you’re fully crossing the three and the seven. His theory, which was well backed up by math, suggested teasers which fully cross the three and the seven are by far the best teaser bets. The author of this book (as Stanford Wong is a pen name) used push charts to show three and seven are the most common margins of victory in the NFL.
Sharp Sports Betting by Stanford Wong, a book first published in 2001, was the first place the term “basic strategy teaser” appeared in print.