What is a teaser bet. The Wong-teaser math, the key-number leverage.

Plain-English answer

A teaser is an NFL parlay-style bet where you move the spread or total in your favor by a fixed number of points (6, 6.5, 7, or 10) on each leg, in exchange for shorter combined odds. The classic Wong teaser is a 2-team 6-point teaser where each leg crosses both 3 and 7, the two most common NFL final-margin numbers. A 6-point teaser at -120 needs each leg to win 73.3% of the time to break even; through 3 and 7 a sharp leg historically clears 76 to 78%, which is why the Wong is the only consistently +EV teaser structure in the book. Most other teasers (7-point, 10-point, three-team, totals teasers) lose long-run because the leg break-even rate climbs faster than the points-bought-vs-key-number probability does. The retail trap: books promote 3-team and 4-team teaser cards on the parlay page because the cumulative break-even rate (around 79% per leg for a 3-team -120 teaser) is unrealistic for any leg combination not Wong-eligible.

A Wong-eligible leg is a 6-point teaser leg where the move crosses both 3 and 7. There are exactly four eligible spread ranges:

• Underdog +1.5 to +2.5 (teases up to +7.5 to +8.5).
• Underdog +2.5 to +3 (teases up to +8.5 to +9).
• Favorite -7.5 to -8.5 (teases down to -1.5 to -2.5).
• Favorite -8.5 to -9 (teases down to -2.5 to -3).

Anything outside those ranges is a non-Wong leg. A 6-point teaser on a 4.5-point favorite (down to +1.5) crosses 3 only, not 7, so the historical hit rate drops to ~73% which is right at break-even. Verify the ranges with EV before betting.

Use it live

Teasers are an NFL-only edge. The math does not transfer to NBA, CFB, or any other sport because no other major sport has key numbers as concentrated as NFL final margins on 3 and 7. Pair the teaser read with EV to confirm both legs are independently +EV before locking in.