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How betting markets actually work
The fundamentals, explained once and properly: what odds really say, where the bookmaker's margin hides, why a lucky run proves nothing, and how betting on-chain differs from your current book. Every example uses real prices.
Betting Fundamentals
Evergreen market-education explainers — odds formats, implied probability, the vig, closing line value.
- Reviewed 3 Nov 2026
What Is Implied Probability? The Math Behind Every Betting Price
Implied probability turns decimal odds into a percentage chance. The formula, a worked example, and why bookmaker markets never add up to exactly 100%.
- Reviewed 3 Nov 2026
The Bookmaker's Margin: What You Pay on Every Bet, Measured on 600+ Matches
Every price hides a fee. We measured it at Toto, Unibet, Polymarket and Overtime over 600+ football matches: from about 2% to 8%, depending on where and what you bet.
- Reviewed 3 Nov 2026
How Betting Odds Work: Decimal, Fractional and American Odds Explained
One price, three ways to write it. Decimal, fractional, American and Polymarket odds explained with a real match priced at Toto, Unibet, Polymarket and Overtime.
Value Betting & Arbitrage
Value bets, surebets and closing-line value: when a price is genuinely too long, why those moments vanish, and why bookmakers limit the people who find them.
- Reviewed 3 Nov 2026
Kelly vs Flat Stakes: We Replayed Both on 334 Real Bets
Kelly grows a bankroll fastest, if your probabilities are right. We replayed flat stakes and three Kelly variants on the same 334 bets. Full Kelly turned €1,000 into €431.
- Reviewed 3 Nov 2026
Why Bookmakers Limit Winning Bettors
Win consistently and your stakes may be cut or your account closed. Why sportsbooks do it, what tends to trigger it, and why prediction markets work differently.
- Reviewed 3 Nov 2026
Closing Line Value: The Only Honest Scoreboard in Betting
Wins and losses are mostly luck in the short run. Closing line value compares your price with the last price before kickoff, and our paper strategies show what no edge looks like.
- Reviewed 3 Nov 2026
What Is a Surebet? Real Arbitrage Bets From Our Data, and the Catches
Back every outcome at different venues and win whatever happens. We found 14 real surebets in 455 matches, worth 0.5–0.9%. Here is one worked out, and everything that can go wrong.
- Reviewed 3 Nov 2026
What Is a Value Bet? We Tested the Textbook Method on 455 Matches
A value bet pays more than the true chance deserves. We estimated the true chance from four venues' prices, bet every outlier, and learned why the market is so hard to beat.
Backtesting & Luck
What a backtest can and cannot tell you: sample size, the luck band, correlated bets, and why a hot start is the most common way to fool yourself.
- Reviewed 3 Nov 2026
Paper Betting: Testing a Strategy Without Risking Money
The only test a strategy cannot cheat on: bets written down before kickoff, at real prices, with pretend money. How we run it, our results so far, and how to do it yourself.
- Reviewed 3 Nov 2026
Overfitting: We Tested 168 Betting Rules. The Best Ones Lost Next Month
Try enough rules and one looks brilliant by accident. We trained 168 simple rules on August–September and tested the winners on October. Four of the five best lost money.
- Reviewed 3 Nov 2026
Why Over 2.5 and Over 3.5 in One Game Aren't Two Bets
Bets on the same match usually win or lose together. How that inflated our own backtest's bet count and luck band, and how to count honestly.
- Reviewed 3 Nov 2026
The Hot-Start Trap: +31% After 71 Bets, Break-Even After the Next 51
Our first strategy made +31% in six weeks and then went flat. What changed, why hot starts fool everyone, and how to protect yourself from your own best results.
- Reviewed 3 Nov 2026
How Many Bets Before a Result Means Something? The Luck Band
Ten bets, eight winners: a system? The luck band tells you how much of a result chance alone explains, with a table for every sample size and four real strategies judged by it.
- Reviewed 3 Nov 2026
What Is a Backtest? A Real One, and What It Can't Tell You
A backtest replays a betting rule on matches already played, at the prices on offer before kickoff. One real backtest from start to finish, and the six questions to ask before you believe any of them.
Bookmakers & Exchanges
How Toto, Unibet (Kambi), Polymarket and Overtime price the same match differently, and what bet builders really cost.
- Reviewed 3 Nov 2026
Anytime Goalscorer Odds: How 41 Strikers Did Against Their Prices
We compared Unibet's anytime-scorer odds with what happened for 41 attackers. On average the market was about right; Harry Kane, priced at 73%, scored in 4 of 9.
- Reviewed 3 Nov 2026
Bet Builders: Why a Same-Game Parlay Costs About 30%
Ajax to win and over 2.5 goals: 2.25 multiplied, 1.66 offered. Part of the gap is fair, because the legs are linked. We worked out how much is margin.
- Reviewed 3 Nov 2026
Polymarket vs a Sportsbook: Betting Without a Bookmaker
On Polymarket the price is set by other users, not a bookmaker. How that works, and why it had the best result-market price in six of ten cases in our data, plus the catches.
- Reviewed 3 Nov 2026
What Is Kambi? The Company Behind Unibet's Odds
Unibet's Dutch odds come from Kambi, a sportsbook supplier. What that means for prices, and Unibet's margins league by league: 2.4% in the Premier League, 5.2% in Ligue 1.
- Reviewed 3 Nov 2026
What Is Toto? The Dutch Sportsbook, and How Its Prices Compare
Toto is the sportsbook of Nederlandse Loterij. Its margin is around 6% on the result market in most leagues, but only 3.1% in the Eredivisie. Measured over 600+ matches.
- Reviewed 3 Nov 2026
Same Match, Four Prices: Toto, Unibet, Polymarket and Overtime Compared
Who pays the most? We compared the last prices before kickoff at four venues over 473 matches. Polymarket had the best 1X2 price 61% of the time, Toto 6%.
Betting On-Chain
Overtime and Polymarket for a bettor who has never used a wallet: setting up, how a bet settles on-chain, and the risks that are specific to it.
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