Short, honest explainers for every concept we use on TipsAudit — fair odds, closing line value, bookmaker margin and the maths that decides whether a bettor wins long-term. No hype, no promises: just how the numbers actually work.
Fair odds are what a bet would pay if the bookmaker took no cut: the true probability turned into a price, with the margin removed.
CLV measures whether you beat the final market price. It is the only publicly verifiable evidence that a bettor or tipster has real skill.
The margin is the bookmaker's built-in cut on every market. Devigging removes it to reveal the probabilities the book actually believes.
Expected value is the long-run average result of a bet: probability times payout, minus the stake. Positive EV is the only reason to ever place a bet.
A value bet is a price above the true probability — not a likely winner. The favourite can be terrible value; a longshot can be excellent value.
Sharp books welcome winners and their prices are close to the truth. Soft books ban winners and their prices drift — that drift is where value hides.
The closing line is the final odds before kick-off — the market's most informed price, and the benchmark every serious bettor measures against.
The Kelly criterion sizes bets in proportion to your edge. It maximises long-term growth — and shows why betting without an edge guarantees ruin.
A 67% win rate can lose money and a 35% win rate can print it. Win rate without odds is the most seductive meaningless number in betting.
Bookmakers systematically overprice longshots because bettors love them. The margin is not spread evenly — outsiders carry most of it.
Odds move because information and sharp money arrive. Reading why a line moved tells you more than the movement itself.
Short-term results are mostly noise. Hundreds of bets are needed before profit says anything — which is why monthly ROI screenshots mean nothing.