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**NRFI** stands for "No Run First Inning." It's a bet on whether both teams will fail to score in the first inning of an MLB game. YRFI is the opposite—"Yes Run

The **Kelly Criterion** is a mathematical formula that tells you what *fraction* of your bankroll to wager on a bet, given your edge and the odds.

**Implied probability** is the probability the sportsbook is *pricing in* when it sets odds. If DraftKings prices a pitcher strikeout prop at -110, that means t

**Vig** is the sportsbook's commission. When you see -110 odds on both sides of a bet, the book is saying:

A **strikeout prop** on DraftKings is a bet on how many strikeouts a pitcher will record in a single game. You're betting Over/Under a specific line—like "Will

**F5** stands for "First 5 Innings." It's a moneyline bet on who will be winning after the first 5 complete innings of an MLB game.

A **home run prop** on DraftKings is a yes/no bet on whether a specific batter will hit a home run in a single game.

Imagine a sports betting model trained on 5 years of data. It sees patterns humans miss—park effects, weather correlations, pitcher fatigue cycles. It outputs p

You now know what NRFI is (no run first inning). You know the baseline (55% of games go scoreless). You know the factors (pitcher, lineup, weather).

**Line movement** is when sportsbook odds change between opening and closing.

A positive ROI over a few hundred bets can be pure luck -- or a soft-line artifact. Closing Line Value (CLV) is the leakage-proof test of whether you are actually beating the market.

Profit boosts and promo odds are the one place a sportsbook voluntarily hands you positive expected value. Here is how to compute exactly how much a boost is worth before you tap it.