What is a point spread?
A spread applies a point adjustment to a team's final score for the purpose of grading that selection. If a team is -3.5, it must win by at least four points for that selection to cover. A team at +3.5 can win outright or lose by three or fewer and still cover. The half point removes the possibility of an exact tie at that line.
What changes on an alternate line?
Instead of the posted -3.5, you might see the same team offered at -6.5 or +1.5. The price should be read next to that exact number: a selection needing a larger winning margin generally has a different price from one needing a smaller margin. The example below is conceptual, not a currently available quote.
Team A -3.5 covers on a 24–20 win. Team A -6.5 does not. Team A +1.5 covers in either case. The result depends on the selected threshold, not merely on which team wins.
Why not estimate missing prices?
Odds depend on the sportsbook, timing, market, and availability. A mathematical guess for an alternate price is not an offered bet. Parlay Edge shows provider-priced alternate spread choices when available; otherwise the posted line is the only selectable price. When you edit a spread in a slip, check the segment, team, line, and odds before continuing.
Full game versus a half
A first-half spread and a full-game spread are different markets. A first-half line is graded on the first-half score under that market's rules, not the final score. If a line is marked 1H or 2H, preserve that label when reviewing the slip. Overtime treatment for half markets can vary, so do not assume the full-game rules apply.