Guides
The fundamentals, in full. Each guide is the complete treatment of one concept — the math worked through, what it’s worth in dollars, and where it stops helping. No picks, no affiliate links.
13 min read
Line shopping: the complete guide
Why sportsbooks post different prices for the same game, exactly what shopping is worth in dollars and win-rate, how to do it without six tabs open, and its honest limits.
Read the guide →12 min read
The vig: the complete guide
How to calculate the bookmaker's margin from any two prices, what it really costs you over a season, how much it varies by sport (measured across 315 games), and the realistic ways to pay less.
Read the guide →14 min read
Closing Line Value: the complete guide
What CLV is, the exact math with worked examples, de-vigging, what a good number looks like, how to improve it — and the places it misleads you.
Read the guide →Put the theory to work
Free calculators for every concept in these guides, a glossary of 88 betting terms, and original research with the full methodology.