Line Movement
Follow the money, not the crowd
Overview
Tracks how betting lines move from open to close, identifying sharp action, steam moves, and reverse line movement that signal professional bettor activity.
What It Does
Monitors line movement patterns across all major sportsbooks from opening to current. Detects steam moves (sudden sharp line shifts), reverse line movement (line moving opposite to public betting %), and identifies which side the professional bettors are on.
Why It Matters
Sharp bettors consistently beat the market. Tracking where they place money (via line movement) is one of the most reliable signals for identifying correct sides in sports markets. When the line moves against public sentiment, professionals are usually driving it.
How It Works
Compares opening lines with current lines, tracks betting ticket percentages vs money percentages to identify sharp vs public money splits. Steam moves (rapid line shifts at sharp books) are flagged as high-confidence signals. Correlates historical line movement patterns with outcomes.
Key Indicators
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Opening vs Current Line
highHow far the line has moved since open
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Reverse Line Movement
highLine moving opposite to public betting %
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Steam Move Detection
highRapid synchronized line moves at sharp books
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Money vs Tickets Split
highPercentage of dollars vs number of bets
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Closing Line Value
mediumWhether you're getting a better price than close
Data Sources
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Public betting percentages and line history
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Professional handicapping data
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Sharp money indicators
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Line movement tracking
Example Questions This Pillar Answers
- → Which way is the line moving on this game?
- → Is there reverse line movement on this matchup?
- → Where is the sharp money going?
- → Has there been a steam move on this game?
Use Line Movement on a real market
Run this analytical framework on any Polymarket or Kalshi event contract.
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