Price movement and line movement are different
A basketball spread may remain at -4.5 while the attached price changes. Alternatively, the spread may move to -5.5 while the price returns closer to an even level.
Both changes alter the proposition. Record the line and price together rather than describing only the favorite or underdog.
Totals respond to expected game conditions
Pace, weather, player availability, tactical news and venue conditions can influence totals. A move from 2.5 goals to 3.0 goals is not directly comparable with a price change on over 2.5.
Push rules and half-point differences affect settlement. Exact market definitions must accompany any chart.
Key numbers can make moves nonlinear
Some scoring systems make particular margins more common than others. Crossing a frequently occurring margin can be more meaningful than moving the same numerical distance elsewhere.
The importance varies by sport and rules. Historical frequency should be updated and should never be presented as certainty for an individual event.
Separate observation from interpretation
An auditable report first states what changed, where and when. It then lists verified news and only after that offers possible explanations.
This structure helps prevent an unexplained move from being promoted as inside information or a fixed outcome.