## The Opening Line
Bookmakers publish an opening price typically several days before an event. This line is set by a small team of traders using models and market knowledge. It is not the "true" probability — it is an opening position, subject to revision.
## Why Odds Move
Odds move for several reasons, not all of which carry the same information:
**Volume-driven movement:** Bookmakers balance their books to limit exposure. If too much money arrives on one outcome, they shorten its price to attract money on the other side. This movement reflects commercial risk management, not necessarily new information.
**Information-driven movement:** A significant injury is announced. The market adjusts rapidly. This is genuine new information updating the probability estimate.
**Sharp money:** A sophisticated bettor or syndicate places a large bet. If the bookmaker respects their opinion (because sharp bettors have proven track records), the odds move to reflect the implied new probability. This is the most information-rich type of movement.
## What to Look For
A line that opens at 2.10 and drifts to 2.40 without any obvious news often signals that sharp money is sitting on the other side. A line that steam-moves from 2.10 to 1.70 in minutes usually reflects either a major news development or a coordinated sharp move.
The pattern of movement tells you a story. You are trying to read that story before acting.
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