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The reference library behind the tools. How a price is built, why it moves, and what the data actually supports. Every study states its sample, its date range and its method.
Start with the mechanics
Value Betting Explained
Guide Value Betting Explained Value betting is not about sounding smarter than the market. It is about comparing price to probab…
Bookmaker Margin and Vig Explained
Guide Bookmaker Margin and Vig Explained The vigorish is the structural mechanism through which every sportsbook generates reven…
Closing Line Value Explained
Guide Closing Line Value Explained: The Market's Most Reliable Benchmark Closing line value measures whether the price you took …
Why Betting Lines Move
Guide Why Betting Lines Move Once an opening line is posted, the number starts changing. These changes are not noise. They are t…
Betting Market Efficiency
Guide Betting Market Efficiency: Where Markets Are Accurate and Where They're Not Sports betting markets aggregate information f…
Kelly Criterion Calculator
Calculator Bankroll and Kelly staking Kelly sizes a bet to maximise long-run growth. It is optimal only if your probability esti…
The library
How a price is built
A betting price is a probability with a fee on top. These pages take that apart in order.
Why lines move
What moves a number after it opens, who moves it, and which explanations do not survive contact with the data.
Market structure
How the market itself behaves: who makes it, how deep it is, how efficient it is, and where the operator's risk limits
Staking and risk
Sizing a bet, surviving variance, and the part that is about you rather than the market.
Bet types and situational edges
What each bet type actually costs, and which situational angles hold up.
More ways in
Start here
If you are new, the pages to read first, in order.
All guides
28 evergreen guides on how betting markets work.
Glossary
Betting terms defined plainly.
Method and sources
Where every number on this site comes from.