How lines move, and why

Lines aren’t set once and left alone. The opening line Glossary Opening line The first number posted for a game. It usually moves as news and bets come in. Full glossary goes up early in the week, and it changes until kickoff. That change is line movement Glossary Line movement How a spread, total or price changes between open and kickoff, driven by news (injuries, weather) and by money. Full glossary . Almost all of it comes from three things.

1. News: injuries and lineups

The biggest moves usually follow injury news, and the quarterback matters most.

Monday openHawks −2.5

Wednesday: Hawks’ starting QB ruled outHawks +1

That’s a 3.5-point swing, right across the key number 3. Someone who bet Owls +2.5 on Monday is now holding a much better number than the market offers.

2. Weather

Forecasts firm up late in the week. Strong wind is the one that most often moves totals.

Tuesday total47.5

Friday: steady 20+ mph wind forecast43.5

3. Money

Books adjust when bets come in. But not all money counts the same. A bet from a sharp Glossary Sharp A bettor the market respects because they have a long record of getting good numbers. Their bets tend to move lines more than many small ones. Full glossary bettor, someone with a long record of getting good numbers, can move a line more than lots of small bets. A quick move across the whole market is called steam Glossary Steam A fast, sharp move across the market, usually after bets from respected bettors or breaking news. Full glossary .

You’ll see “ticket” and “money” percentages that say how much of the public is on each side. Treat those with care. A popular side isn’t automatically a wrong one, and we don’t pick against the public on ticket counts alone.

Price moves vs. number moves

Near key numbers, books often change the price before the number. Hawks −3 (−110) might become Hawks −3 (−120). Moving off 3 to −3.5 is a bigger step because so many games land on 3, so the price takes the pressure first.

Don’t chase a moved line

If you liked Owls +3.5 and it’s now +2.5, that isn’t the same bet. You’ve lost the hook on the most common margin. A good bet at one number can be a pass at another. When you see a line somewhere, check the current consensus line Glossary Consensus line The typical number across the market at a moment in time, rather than any one shop’s number. Full glossary before you act; numbers can change in minutes.

Quick checkA spread goes from Hawks −3 (−110) to Hawks −3 (−125). What happened?Tap to see the answer

The price moved instead of the number. More money (or more respected money) came in on the Hawks, and the book made them more expensive to bet while keeping the spread on the key number 3.