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General

Opening Line

The first odds offered by a bookmaker for a specific event or market. Opening lines are typically released several days before an event and move based on betting action, news, and other factors. Sharp bettors often look for value in opening lines before the market corrects.

Related General Terms

Sharp
A professional or highly skilled bettor who consistently finds value in the betting markets. Sharps are respected by bookmakers and their action often moves lines. Being a sharp bettor implies disciplined bankroll management, statistical modeling, and a long-term positive expected value approach.
Void
A bet that is cancelled and the stake is returned to the bettor. Bets can be voided for various reasons including event cancellation, player withdrawal, or if the bet was placed in error. In accumulators, a voided selection is removed and the bet is recalculated with the remaining selections.
Lock
A bet that is considered a sure winner, though no bet is ever truly guaranteed. The term is commonly used by tipsters and recreational bettors to express high confidence. Sharp bettors are skeptical of 'locks' because they understand that uncertainty is inherent in all sports outcomes.
Bookmaker (Bookie)
A company or individual that accepts and pays out bets on sporting and other events. Bookmakers set the odds, manage risk, and build in a margin (overround) to ensure long-term profitability. Examples include Bet365, DraftKings, and FanDuel.
Wager
Another term for a bet. A wager is an agreement to risk money on the outcome of an event at agreed-upon odds. The term is commonly used in the United States and in formal or legal contexts related to sports betting.
Liability
The maximum amount a bookmaker or a lay bettor stands to lose on a single bet. For bookmakers, liability is managed across thousands of bets. On a betting exchange, when you lay a bet, your liability is the amount you must pay the backer if they win. Understanding liability is essential for exchange betting.
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