LineTeasers, and why they're usually bad
A teaser lets you move the spread in your favor — typically 6 points in football — on two or more legs, in exchange for a worse payout. Move a -7.5 favorite to -1.5, move a +3 dog to +9, and both must cover. The catch is the same multiplication problem parlays have: a standard two-team, 6-point teaser at -120 needs each leg to win about 73.9% of the time to break even. Six random points of spread movement don't buy you 73.9%. Random teasers are among the worst bets on the board.
The Wong insight: not all points are equal
Stanford Wong's observation, published in Sharp Sports Betting (2001), is that NFL games don't land uniformly — they cluster violently on certain margins because of how football scores. The two biggest spikes are 3 (a field goal) and 7 (a touchdown), which together decide a huge share of games. So six points of teaser movement is worth a fortune if it carries your number through both 3 and 7, and worth much less anywhere else.
That yields the classic Wong rules. Tease only: favorites of -7.5 to -8.5 down to -1.5 / -2.5, and underdogs of +1.5 to +2.5 up to +7.5 / +8.5. Both moves cross 3 and 7 — the entire population of one-score outcomes — and both end on the safe side of the key numbers rather than on them. In Wong's era, legs in this window covered around 75–77% of the time, clearing the 73.9% break-even at -120 and making the teaser a rare bettor-favorable exotic.
What's left of the edge
Twenty-plus years is a long time for a published edge to survive, and the books have responded three ways. Pricing: many books now charge -130 or -135 for two-team, 6-point teasers, pushing break-even to 75–77% per leg — eating most or all of the historical edge. Rule changes: some books grade teaser pushes as losses or ban teasing through key numbers entirely. The game itself: the extra point moving back (2015) and analytics-driven two-point aggression have mildly diluted how often games land exactly on 3 and 7. The honest current summary: Wong teasers at -120 with pushes-reduce remain playable and close to neutral-or-better in the right weeks; at -135 they're just a well-dressed parlay. The strategy's modern value is as much the discipline — it gives you a precise, checkable rule for when a teaser is even a candidate, which for most bettors means the answer is "almost never," and that answer saves real money.
Two practical notes. Totals matter: key-number clustering is strongest in low-totaled games, so Wong legs in games totaled 49+ are weaker than the raw rule suggests. And never fill out a Wong teaser with a non-qualifying leg to make the ticket feel bigger — one leg outside the window converts the whole structure back into the sucker bet it was designed to avoid.