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In gambling parlance, making a book is the practice of laying bets on the various possible outcomes of a single event. The phrase originates from the practice of recording such wagers in a hard-bound ledger (the 'book') and gives the English language the term bookmaker for the person laying the bets and thus 'making the book'.
The subject of this article isn't "bookmaker odds", and I don't think the phrase "bookmaker odds" is synonymous with "mathematics of gambling" necessarily, either. Perhaps merging this article into an article on "bookmaker odds" might make more sense.
A £10 each-way single on a 10-1 selection in a horse race and paying 1 ⁄ 4 the odds a place 1, 2, or 3 would cost £20.. Returns on the win part of the bet would be £10 × (10/1 × 1) + stake = £110 (£100 winnings + £10 stake)
By "adjusting the odds" in their favour (paying out amounts using odds that are less than what they determined to be the true odds) or by having a point spread, bookmakers aim to guarantee a profit by achieving a 'balanced book', either by getting an equal number of bets for each possible outcome or (when they are offering odds) by getting the amounts wagered on each outcome to reflect the ...
Under proportional vigorish, a "fair odds" betting line of 2.00/2.00 [b] without vigorish would decrease the payouts of all outcomes equally, perhaps to 1.95/1.95, once it was added. More commonly though, disproportional vigorish will be applied as part of the efforts to keep the amounts wagered balanced, such as 1. 90 /2.00, making the outcome ...
The use of odds in gambling facilitates betting on events where the probabilities of different outcomes vary. In the modern era, most fixed-odd betting takes place between a betting organisation, such as a bookmaker, and an individual, rather than between individuals. Different traditions have grown up in how to express odds to customers.
On 3 August 2020, the bookmaker opened the first full-service betting operation housing professional sports teams in the U.S. at Capitol One Arena in Washington D.C. [67] In January 2021, a joint venture between William Hill and Argenbingo received a licence to offer online gambling services in the Argentinean province of Buenos Aires. [68]
A non-Tote bookmaker will offer a quarter or a fifth for the e/w component, whereas the Tote place payout, and as such the e/w payout, is as always the betting pool dividend. With the advent of the exchanges, more and more bookmakers are beginning to offer 'place only' markets in an attempt to rival the exchanges.