Appendix and Quick Reference
Use this section when you need the condensed version: terminology, formulas, compact examples, red flags, and study directions.
AppendixGlossary
| Term | Meaning |
|---|---|
| Break-even rate | The win percentage needed to make zero expected profit at a given price. |
| CLV | Closing line value. A comparison between your number and the market’s closing number. |
| Decimal odds | Total return multiplier including stake. |
| Edge | The amount by which your estimated true probability beats the market price. |
| Expected value | The average amount you expect to win or lose per bet over many repetitions. |
| Hook | The half-point attached to a line, such as 3.5 or 47.5. |
| Implied probability | The probability implied by the sportsbook price. |
| Juice / Vig | The sportsbook’s built-in margin. |
| Kelly criterion | A formula for staking based on estimated edge and payout. |
| Market maker | A book or trading desk that originates respected prices. |
| Moneyline | A bet on who wins the event outright. |
| Parlay | A multi-leg ticket where every leg typically must win. |
| Push | A tied result against the posted number, usually returning stake. |
| Spread | A handicap applied to one side to balance the betting market. |
| Total | A bet on whether combined scoring lands over or under the posted number. |
| Unit | A standardized bet size used for bankroll management. |
| Variance | The normal swing between short-term results and long-run expectation. |
| Void | A canceled bet that usually returns stake. |
AppendixFormula Sheet
AppendixWorked Examples
Example 1: Convert -110 to Probability
$\frac{110}{110 + 100} = 52.38\%$. That means the book is asking you to accept a price that requires a 52.38% win rate to break even.
Example 2: Remove Vig from -110 / -110
Each side implies 52.38%. Total implied = 104.76%. Normalize each side: $\frac{52.38}{104.76} = 50\%$. The no-vig market says each side is roughly 50/50.
Example 3: Positive EV at +150
If you estimate a 45% win chance, the fair decimal price is about 2.22, or fair American around +122. At +150, the book is offering a better price than your fair estimate, so EV is positive.
Example 4: Why a Good Bet Can Lose
If your edge says a bet wins 55% of the time, it still loses 45% of the time. Over ten bets, several losses in a row are perfectly possible. That is variance, not proof the edge is fake.
AppendixCommon Mistakes
- Confusing “most likely winner” with “best bet at the current price.”
- Ignoring vig and assuming two sides of a market must add to 100%.
- Tracking wins and losses but not prices, units, or closing line value.
- Betting too many markets without understanding their rules or margins.
- Using parlays as a shortcut to profitability instead of a high-variance product.
- Increasing stake size because of boredom, tilt, or recent results.
- Letting live betting become an emotional chase environment.
- Using betting money that belongs to ordinary life obligations.
AppendixResources
What to Study Next
Probability, statistics, market microstructure, and sport-specific scoring distributions are the most valuable subjects once the basics here feel comfortable.
What to Build Next
A personal tracking sheet, a no-vig price calculator, and a line-shopping routine are better first tools than a giant predictive model.
What to Check Before Betting
Your local rules, the book’s house rules, your bankroll limits, and whether the activity is still staying inside the boundaries you intended.