Every term you need to read this site — and any sharp betting content — defined in plain language: value bets, EV, CLV, Kelly staking, vig, handicaps and the metrics behind our models. Each entry links to a full guide or a free calculator.
A bet where the bookmaker's odds pay more than the true probability of the outcome justifies. If a team wins 50% of the time but the odds imply only 40%, betting it is +EV — you profit long-term even while losing individual bets. Finding value requires estimating probabilities better than the bookmaker, which is what a betting model is for.
What is value betting? →The average profit or loss of a bet if it were repeated many times: EV = (probability × odds) − 1. A bet with 55% win probability at odds of 2.00 has an EV of +10%. Positive EV is the only thing that makes betting profitable in the long run — everything else is variance.
EV explained, with calculator →The difference between the odds you took and the market's final (closing) odds. Beating the close consistently is the strongest available evidence that your bets have real edge, because the closing line is the market's most informed price. CLV is most reliable for moneyline-style markets; for totals and handicaps, realized ROI matters more.
CLV deep dive →A staking formula that sizes each bet in proportion to your edge and bankroll: stake % = (p×b − q) / b. Full Kelly maximizes long-term growth but swings violently; serious bettors use fractional Kelly (we use 25%) to cut variance at a small cost in growth. Bankroll ruin is permanent — fractional Kelly is not negotiable.
Kelly calculator →The bookmaker's built-in commission: the implied probabilities of all outcomes sum to more than 100%, and the excess is the vig. A coin flip priced at 1.91/1.91 carries about 4.7% vig. Removing it (devigging) reveals the market's true probability estimate — the starting point for finding value.
Devigging explained →The win probability a betting price corresponds to: 1 divided by the decimal odds. Odds of 2.50 imply 40%. Comparing implied probability (after removing the vig) with your own estimate is how every value bet is identified.
How to read betting odds →The final odds available just before an event starts. It aggregates all information and money in the market and is the most accurate public probability estimate that exists for a game — which is why beating it (CLV) is the standard test of betting skill.
Our live CLV tracking →A bet on which team or player wins outright, with no point handicap. Odds carry all the information: heavy favourites pay little, underdogs pay a lot. In soccer the equivalent three-way market (home/draw/away) is called 1X2.
Moneyline vs spread →A handicap that levels the matchup: the favourite must win by more than the spread, the underdog can lose by less and still cover. Spreads re-centre every game to roughly a coin flip at odds near 1.91, so the skill is in beating the number, not picking the winner.
Spread betting explained →A soccer handicap market that eliminates the draw using half- and quarter-goal lines (e.g. −0.5, −0.75). Quarter lines split your stake across two adjacent handicaps, so bets can win, lose, half-win or push. The two-outcome structure makes it the preferred market for handicap value.
Asian handicap guide →A bet on the combined score of both teams relative to a line the bookmaker sets — over 2.5 goals, under 47.5 points. You're pricing the pace and style of a game rather than its winner. Half-point lines can't push; whole-number lines refund on an exact hit.
Totals explained →A single bet combining multiple selections; all legs must win. Odds multiply, but so does the bookmaker's margin — a 4-leg parlay at soft-book prices typically carries several times the vig of four single bets. Entertaining, rarely +EV.
Parlay calculator →The most common winning margins in a sport. In the NFL, games land on 3 and 7 far more than any other margin, so half-point moves around those numbers are worth much more than elsewhere. Key numbers drive teaser value and spread shopping.
NFL key numbers →Odds changing between open and kickoff as money and information arrive. Sharp-driven moves ('steam') at low-margin books are informative; a line moving toward your position after you bet is positive CLV in the making. Moves at soft books often just follow the sharps.
Sharp money & line moves →A strength rating updated after every game: the winner takes points from the loser, more for an upset than for an expected result. Elo differences convert directly into win probabilities, which makes it a compact, self-correcting backbone for prediction models.
Elo explained →A soccer metric that values every shot by its scoring probability based on location, angle and situation. Summed over a match, xG measures chance quality and strips out finishing luck — a better predictor of future results than goals themselves.
xG explained →The standard accuracy measure for probability forecasts: the mean squared difference between predicted probability and outcome (0 or 1). Lower is better; 0.25 is coin-flip level for a binary market. We publish ours because a model's Brier score against the market's is the honest test.
Our model, measured →Yield is profit divided by total stakes — the standard per-bet profitability measure. A sustainable yield for a real edge is 3–8%; anything far above that over a small sample is luck or overfitting. ROI on bankroll compounds staking decisions on top.
Yield vs ROI vs CLV →A unit is a fixed reference stake, usually 1–2% of bankroll, that makes results comparable across bettors and bet sizes. Disciplined sizing — flat units or fractional Kelly — is what keeps variance from ending a profitable strategy before the edge can show.
Bankroll management →Short-term results are dominated by luck: even a genuinely profitable bettor loses over 100-bet stretches routinely. Around 500 bets, results begin to say something; before that, judge a strategy by process metrics like CLV, not by the profit curve.
Variance & sample size →A tied bet: the result lands exactly on the line (a 3-point favourite wins by exactly 3, a total lands exactly on 44). The stake is refunded. Half-point lines exist precisely to remove the push outcome.
Soft bookmakers restrict or close accounts that win or that consistently beat the closing line — often within weeks. It's the structural reason value bettors spread across many books and why exchanges and sharp books, which don't limit winners, matter.
Why books limit winners →A value bet is a bet where the bookmaker's odds pay more than the outcome's true probability justifies. If the odds imply 40% but the real chance is 50%, the bet has positive expected value and profits over the long run — even though individual bets still lose.
Value betting is the strategy of only placing bets whose odds exceed fair value, sized with disciplined staking (fractional Kelly). It replaces predicting winners with pricing probabilities better than the bookmaker — the only approach that is profitable long-term.
CLV (closing line value) measures whether you got better odds than the market's final price. Consistently positive CLV is the strongest evidence of a real edge, because the closing line is the most accurate public estimate of an event's probability.