Reverse Line Movement, in plain words
Reverse line movement, or RLM, is when a line moves against the side that most bets are on. If 75% of tickets are on the favorite and the spread moves from -7 to -6.5, the book is making the favorite cheaper even though most bettors want it. Something else is pushing the price.
The usual reading is that fewer, larger bets are on the other side, and that the book respects them more than the crowd. That is why RLM is grouped with sharp money. It is a clue about who is betting, not a proof of who will win.
Two cautions. Ticket and money percentages come from a sample of books, so they are estimates. And a line can also move for news, such as an injury, that has nothing to do with the bets. Use RLM as one input beside the price, never as a reason on its own.
The idea, drawn
Worked example · illustration
75% of tickets on the favorite, line moves toward the dog
- Tickets on favorite
- 75%
- Opened
- Favorite -7
- Now
- Favorite -6.5
- Move
- Toward the underdog
- Three of every four bets are on the favorite.
- The book still moves the favorite from -7 to -6.5, a cheaper number for the popular side.
- The likely reading: larger bets the book respects are on the underdog.
The move is a clue about the money. It says nothing certain about the result.