Parimutuel betting (from the French: Pari Mutuel or mutual betting) is a betting system in which all bets of a particular type are placed together in a pool; taxes and the "housetake" or "vig" are removed, and payoff odds are calculated by sharing the pool among all winning bets. In some countries it is known as the Tote after the totalisator which calculates and displays bets already made.
The parimutuel system is used in gambling on horse racing, greyhound racing, jai alai, and all sporting events of relatively short duration in which participants finish in a ranked order. A modified parimutuel system is also used in some lottery games.
Definition
Parimutuel betting differs from fixedodds betting in that the final payout is not determined until the pool is closed – in fixed odds betting, the payout is agreed at the time the bet is sold.
Parimutuel gambling is frequently stateregulated, and offered in many places where gambling is otherwise illegal. Parimutuel gambling is often also offered at "off track" facilities, where players may bet on the events without actually being present to observe them in person.
Example
Consider a hypothetical event which has eight possible outcomes, in a country using a decimal currency such as dollars. Each outcome has a certain amount of money wagered:
1 
$30.00

2 
$70.00

3 
$12.00

4 
$55.00

5 
$110.00

6 
$47.00

7 
$150.00

8 
$40.00

Thus the total pool of money on the event is $514.00. Following the start of the event, no more wagers are accepted. The event is decided and the winning outcome is determined to be Outcome 4 with $55.00 wagered. The payout is now calculated. First the commission or take for the wagering company is deducted from the pool; for example with a commission rate of 14.25% the calculation is: $514 × (1  0.1425) = $440.76. The remaining amount in the pool is now distributed to those who wagered on Outcome 4: $440.76 / $55 ≈ $8 per $1 wagered. This payout includes the $1 wagered plus an additional $7 profit. Thus, the odds on Outcome 4 are 7to1 (or, expressed as decimal odds, 8.01).
Often at certain times prior to the event, betting agencies will provide approximates for what should be paid out for a given outcome should no more bets be accepted at the current time. Using the wagers and commission rate above (14.25%), an approximates table in decimal odds would be:
1 
$14.69

2 
$6.30

3 
$36.73

4 
$8.01

5 
$4.01

6 
$9.38

7 
$2.94

8 
$11.02

In reallife examples such as horse racing, the pool size often extends into millions of dollars with many different types of outcomes (winning horses) and complex commission calculations.
Sometimes the amounts paid out are rounded down to a denomination interval—in the United States and Australia, 10¢ intervals are used. The rounding loss is sometimes known as breakage and is retained by the betting agency as part of the commission.
In horse racing, a practical example of this circumstance might be when an overwhelming favorite wins. The parimutuel calculation results might call for a very small winning payout (say, $1.02 or $1.03 on a dollar bet), but the legal regulation would require a larger payout (e.g., $1.10 on a dollar bet). In North America, this condition is usually referred to as a minus pool.
Algebraic summary
In an event with a set of n possible outcomes, with wagers W_{1}, W_{2}, …, W_{n} the total pool of money on the event is
 $W\_T\; =\; \backslash sum^n\_\{i=1\}\; W\_i.$
After the wagering company deducts a commission rate of r from the pool, the amount remaining to be distributed between the successful bettors is W_{R} = W_{T}(1 − r). Those who bet on the successful outcome m will receive a payout of W_{R} / W_{m} for every dollar they bet on it.
History
The parimutuel system was invented by Catalan impresario Joseph Oller in 1867.^{[1]}
The large amount of calculation involved in this system led to the invention of a specialized mechanical calculating machine known as a totalisator, "automatic totalisator" or "tote board", invented by the Australian engineer, George Alfred Julius. The first was installed at Ellerslie Racecourse, Auckland, New Zealand in 1913, and they came into widespread use at race courses throughout the world. The U.S. introduction was in 1927, which led to the opening of the suburban Arlington Racetrack in Arlington Park, near Chicago and Sportsman's Park in Cicero, Illinois, in 1932.^{[2]}
Strategy and comparison with independent bookmakers
Unlike many forms of casino gambling, in parimutuel betting the gambler bets against other gamblers, not the house. The science of determining the outcome of a race is called handicapping.
It is possible for a skilled player to win money in the long run at this type of gambling, but overcoming the deficit produced by taxes, the facility's take, and the breakage is difficult to accomplish and few people are successful at it.
Independent offtrack bookmakers have a smaller take and thus offer better payoffs, but they are illegal in some countries. However, with the introduction of Internet gambling has come "rebate shops". These offshore betting shops in fact return some percentage of every bet made to the bettor. They are in effect reducing their take from 1518% to as little as 1 or 2%, still ensuring a profit as they operate with minimal overhead. Rebate shops allow skilled horse players to make a steady income.
The recent World Trade Organization decision DS285^{[3]} against the United States of America by the small island nation of Antigua opens the possibility for offshore horse betting groups to compete legally with parimutuel betting groups.
Parimutuel bet types
There may be several different types of bets, in which case each type of bet has its own pool. The basic bets involve predicting the order of finish for a single participant, as follows:
North America
In Canada and the United States, the most common types of bet on horse races include:
 Win: to succeed the bettor must pick the horse that wins the race.
 Place: the bettor must pick a horse that finishes either first or second.
 Show: the bettor must pick a horse that finishes first, second or third.
 Across the board: the bettor places three separate bets to win, place or show.
 Exacta, perfecta, or exactor: the bettor must pick the two horses that finish first and second, in the exact order.
 Trifecta or triactor: the bettor must pick the three horses that finish first, second, and third, in the exact order.
 Superfecta: the bettor must pick the four horses that finish first, second, third and fourth, in the exact order.
 Box: a box can be placed around exotic betting types such as exacta, trifecta or superfecta bets. This places a bet for all permutations of the numbers in the box. An exacta box with two numbers, commonly called quinella or quiniela, is a bet on either of two permutations: A first and B second, or B first and A second. A trifecta box with three numbers has six possible permutations (of the horses in the "box" three can finish first, two can finish second, and one can finish third: 3 × 2 × 1) and costs six times the betting base amount. A trifecta box with five numbers has 60 possible permutations and costs 60 times the betting base amount (5 × 4 × 3). In France, a "box" gives only the ordered permutations going along an ordered list of numbers such that a trifecta box with six numbers would cost 20 times the base amount.
 Any2 or Duet: The bettor must pick the two horses who will place first, second or third but can finish in any order. This could be thought of as a double horse show key (see below).
 Double: the bettor must pick the winners of two successive races (a 'running' or 'rolling' double); most race tracks in Canada and the United States take double wagers on the first two races on the program (the daily double) and on the last two (the late double).
 Triple: the bettor must pick the winners of three successive races; like doubles, many tracks offer "running" or "rolling" triples. Also called pick three or more commonly, a treble.
 Quadrella or Quaddie: The bettor must pick the winners of four nominated races at the same track.
 Pick six or Sweep six: Traditionally, the bettor must pick the winners of six consecutive races. However, there are variants ranging from three to nine races, with a fourrace bet known as a Pick Four. Exclusively for the pick six, a progressive jackpot is sponsored by the host track and available at its satellite locations which grows until someone picks six winners correctly. There is also a consolation prize for those who pick five winners correctly, divided amongst the number of tickets registered in the system with five out of six right, in a case where nobody gets five or six winners, a four out of six consolation prize may occur. A Place Pick Nine makes up for the increased difficulty of the high number of races by allowing a secondplace finish for a bettor's selected horse to count as a win.
Win, place and show wagers class as straight bets, and the remaining wagers as exotic bets. Bettors usually make multiple wagers on exotic bets. A box consists of a multiple wager in which bettors bet all possible combinations of a group of horses in the same race. A key involves making a multiple wager with a single horse in one race bet in one position with all possible combinations of other selected horses in a single race. A wheel consists of betting all horses in one race of a bet involving two or more races. For example a 1all daily double wheel bets the 1horse in the first race with every horse in the second.
People making straight bets commonly employ the strategy of an "each way" bet. Here the bettor picks a horse and bets it will win, and makes an additional bet that it will show, so that theoretically if the horse runs third it will at least pay back the two bets. The Canadian and American equivalent is the bet across (short for across the board): the bettor bets equal sums on the horse to win, place, and show.
In Canada and the United States bettors make exotic wagers on horses running at the same track on the same program. In the United Kingdom bookmakers offer exotic wagers on horses at different tracks. Probably the Yankee occurs most commonly: in this the bettor tries to pick the winner of four races. This bet also includes subsidiary wagers on smaller combinations of the chosen horses; for example, if only two of the four horses win, the bettor still collects for their double. A Trixie requires trying to pick three winners, and a Canadian or Super Yankee trying to pick five; these also include subsidiary bets. There are also other bets which are large combinations of singles, doubles, trebles and accumulators some of them are called Lucky 15, Lucky 31, Heinz, Super Heinz, Goliath. The term nap identifies the best bet of the day.
A parlay, accumulator or rollup consists of a series of bets in which bettors stake the winnings from one race on the next in order until either the bettor loses or the series completes successfully.
Australia/New Zealand
 Win: Runner must finish first.
 Place: Runner must finish first, second or third place. In events with five to seven runners, no dividends are payable on third place (signified by "NTD" or No Third Dividend) and in events with 4 or fewer runners, only Win betting is allowed.
 EachWay: A combination of Win and Place. A $5 bet Eachway is a $5.00 bet to Win and a $5.00 bet to Place, for a total bet cost of $10.
 Exacta: The bettor must correctly pick the two runners which finish first and second.
 Quinella: The bettor must pick the two runners which finish first and second, but need not specify which will finish first.
 Trifecta: The bettor must correctly pick the three runners which finish first, second, and third.
 First4: The bettor must correctly pick the four runners which finish first, second, third and fourth.
 Duet: The bettor must pick the two horses who will place first, second or third but can finish in any order.
 Running Double: The bettor must pick the winners of two consecutive races at same track.
 Daily Double: The bettor must pick the winners of two nominated races at the same track.
 Treble: The bettor must pick the winners of three nominated races at the same track. This bet type is only available in the states of Queensland and South Australia.
 Quadrella or Quaddie: The bettor must pick the winners of four nominated races at the same track.
 Big 6: The bettor must pick the winners of six nominated races, which can be at the same track or split over two or more tracks.
In Australia, certain exotic bet types can be laid as "flexi" bets. Usually the price of an exotic bet is determined by a set multiple of the outcome, for example $60 for a five horse boxed trifecta at one unit ($1)—or $30 at half unit (50c). If the bet is successful, the bettor will get either the full winning amount shown on the board, or half the winning amount. Under a flexi system the bettor can nominate their desired total wager, and their percentage of payout is determined by this wager's relationship to the full unit price. Using a five horse box trifecta, the bettor may wish to lay only $20 on the outcome. Their percentage of winnings is now calculated as $20/$60 = 33.3%. If the bet is successful, the payout will be 33.3% of the winning amount for a full unit bet.
In recent times the "Roving Banker" variant for Trifecta and First4 betting is now offered. For a Roving Banker First4 the player selects one, two or three runners they believe will definitely finish 1st, 2nd, 3rd or 4th, and up to three selections as Roving Banker(s) with other runners to fill the remaining place(s). A Roving Banker Trifecta is where the player believes that one or two runners will definitely finish 1st, 2nd or 3rd. The bet can be placed by picking the player's favourite runner to finish in any place within the bet and complete the Trifecta with any number of other runners to fill the other placing(s).^{[4]}
Britain
The following pools are operated at meetings in mainland Britain:
 Win: Runner must finish first.
 Place: Runner must finish within the first two places (in a 5–7 runner race), three places (8–15 runners and nonhandicaps with 16+ runners) or four places (handicaps with 16+ runners).
 Eachway: Charged and settled as one bet to win and another bet to place (for example, a punter asking for a bet of "five pounds each way" will be expected to pay ten pounds).
 Scoop6: Pick the winner (for the win fund) or a placed horse (for the place fund) from the six advertised Scoop6 races. Saturdays only.
 Jackpot: Pick the winner from each of the first six races of the advertised Jackpot meeting of the day.
 Placepot: Pick a placed horse from each of the first six races from any British race meeting.
 Quadpot: Pick a placed horse from the third, fourth, fifth and sixth race from any British race meeting.
 Trifecta: The bettor must correctly pick the three runners which finish first, second, and third, in the correct order.
 Exacta: The bettor must correctly pick the two runners which finish first and second, in the correct order.
 Swinger: The bettor must correctly pick two runners to finish in the places, both runners must place, in any order.
 Super7
Ireland
Tote Ireland operates the following pools:
 Win: Runner must finish first
 Place: Runner must finish within the first two places (in a 5–7 runner race), three places (8–15 runners and nonhandicaps with 16+ runners) or four places (handicaps with 16+ runners). (From 23 April 2000 to 23 May 2010, Tote Ireland operated 4place betting on all races with 16 or more runners.)
 Eachway: Charged and settled as one bet to win and another bet to place (for example, a punter asking for a bet of "five euro each way" will be expected to pay ten euro).
 Jackpot: A Pick 4 bet on races 3–6 at every meeting.
 Pick Six: On races 1–6 at one meeting on all Sundays and occasionally on other days (introduced on 9 January 2011).
 Placepot: The better must correctly pick one horse to place in each of the races 2–7.
 Exacta: The bettor must correctly pick the two runners which finish first and second, in the correct order.
 Trifecta: The bettor must correctly pick the three runners which finish first, second, and third, in the correct order (introduced on 26 May 2010).
 Daily Double: The bettor must correctly pick the winners of race 5 and race 6 (introduced on 22 January 2011).
Different arrangements apply at the two recognised racecourses in Northern Ireland. Tote Ireland operates pools on racing at Down Royal, but at Downpatrick the tote pools are operated independently by Datatote who also run all greyhound pools in Ireland and most greyhound pools in the UK.
Sweden
Bet types for harness racing (trotting):
 Vinnare (winner): Runner must finish first.
 Plats (place): Runner must finish within the first two places (up to five runners) or first three places (six runners or more).
 Vinnare & Plats: Two bets, one on "vinnare" and one on "plats" for the same runner. Asking for a bet of "50 SEK vinnare och plats" costs 100 SEK
 Tvilling (twin): The bettor must pick the runners that finish first and second, but need not specify which will finish first.
 Trio (trio): The bettor must pick the runners that finish first, second and third in a nominated race.
 Dagens Dubbel (daily double) and Lunchdubbel (lunch double): The bettor must pick the winners of two nominated races at the same track.
 V3: The bettor must pick the winners of three nominated races at the same track. Unlike V4, V5, V65 and V75, where a bet for all races must be made before the start of the first race, in V3 the bettor selects the winner one race at a time.
 V4: The bettor must pick the winners of four nominated races at the same track.
 V5: The bettor must pick the winners of five nominated races at the same track.
 V65: The bettor must pick the winners of six nominated races at the same track. Return is also given for (combinations of) five correctly picked winners, even if the same bet included all the six winners.
 V64: The bettor must pick the winners of six nominated races at the same track. Return is also given for (combinations of) five or four correctly picked winners, even if the same bet included more correct picks.
 V75: The bettor must pick the winners of seven nominated races at the same track. Return is also given for (combinations of) six or five winners picked correctly, even if the same bet included more correct picks. The betting pool is split into three separate pools for all combinations of seven (40%), six (20%) and five (40%) correctly picked winners. This is the largest nationwide betting game in Sweden, running each Saturday with weekly pools of about 80 MSEK ($11 million).
Hong Kong
The Hong Kong Jockey Club (HKJC) operates the following bet types and pools.
 Win: Select correctly the 1st horse in a race.
 Place: Select correctly the 1st, 2nd or 3rd horse in a race with 7 or more declared starters, alternatively select correctly the 1st or 2nd in a race where there are 4 to 6 declared starters.
 Quinella: Select correctly the 1st and 2nd horses in any order in a race.
 Quinella Place: Select correctly any two of the first three placed horses in any order in a race.
 Tirce: Select the 1st, 2nd and 3rd horses in the correct order in a race.
 Trio: Select correctly the 1st, 2nd and 3rd horses in any order in a race.
 First 4: Select correctly the 1st, 2nd, 3rd and 4th horses in any order in a race.
 Double Trio: Select correctly the 1st, 2nd and 3rd horses in any order in each of the two nominated races.
 Triple Trio: Select correctly the 1st, 2nd and 3rd in any order in each of the three nominated races. There is a consolation prize given under the conditions that the player has selected correctly the 1st, 2nd and 3rd horses in any order in the first two Legs of the three nominated races.
 Double: Select correctly the 1st horse in each of the two nominated races. There is a consolation prize given under the conditions that the player has selected correctly the 1st horse in the first nominated race and the 2nd horse in the second nominated race.
 Treble: Select correctly the 1st horse in each of the three nominated races. There is a consolation prize given under the conditions that the player has selected correctly the 1st horse in the first two Legs and the 2nd horse in the third Leg of the three nominated races.
 Six Up: Select correctly the 1st or 2nd horse in each of the six nominated races. There is a consolation prize given under the conditions that the player has selected correctly the 1st horse in each of the six nominated races.
Japan
In Japan, Keiba (競馬, horse racing), Keirin (競輪, professional cycling), Kyōtei (競艇, hydroplane racing), and Auto Race (オートレース, motorcycle racing) operate the following bet type.^{[5]}^{[6]}^{[7]}^{[8]} Wager must be a multiple of 100 yen except Eachway.
 Win (単勝, Tanshō): Runner must finish first (Keiba, Kyōtei and Auto Race).
 PlaceShow (複勝, Fukushō): Runner must finish within the first two places (in a seven runners or fewer race) or three places (in an eight runners or more race) (Keiba, Kyōtei and Auto Race).
 Eachway (応援馬券, Ōen Baken): To place one bet to Win and another bet to PlaceShow. (For example, betting 1,000 yen to Eachway means betting 500 yen to Win and 500 yen to PlaceShow.) Wager must be multiple of 200 yen (Keiba with JRA's operation only).
 Bracket Quinella (枠番連勝複式, Wakuban Renshō Fukushiki), abbreviated as Wakuren (枠連): The bettor must pick the two bracket numbers which finish first and second, but need not specify which will finish first. A bracket number (枠番, Wakuban) means runner's cap color (1: White; 2: Black; 3: Red; 4: Blue; 5: Yellow; 6: Green; 7: Orange; 8: Pink) (Keiba, Keirin and Auto Race).
 Bracket Exacta (枠番連勝単式, Wakuban Renshō Tanshiki), abbreviated as Wakutan (枠単): The bettor must correctly pick the two bracket numbers which finish first and second (Keiba with some local governments' operation only).
 Quinella (連勝複式, Renshō Fukushiki), abbreviated as Umaren (馬連), Nishafuku (2車複) or Nirenpuku (2連複): The bettor must pick the two runners which finish first and second, but need not specify which will finish first (Keiba, Keirin, Kyōtei and Auto Race).
 Exacta (連勝単式, Renshō Tanshiki), abbreviated as Umatan (馬単), Nishatan (2車単) or Nirentan (2連単): The bettor must correctly pick the two runners which finish first and second (Keiba, Keirin, Kyōtei and Auto Race).
 QuinellaPlace (拡大連勝複式, Kakudai Renshō Fukushiki), also known as Wide (ワイド) or Kakurenpuku (拡連複): The bettor must pick the two runners which finish the top three—no need to specify an order (For example, when the result of race is 362451, the top three runners are 2, 3 and 6, and winning combinations are 23, 26 and 36.) (Keiba, Keirin, Kyōtei and Auto Race).
 Trio (3連勝複式, Sanrensho Fukushiki), abbreviated as Sanrenpuku (3連複): The bettor must pick the three runners which finish the top three, but no need to specify an order (Keiba, Keirin, Kyōtei and Auto Race).
 Trifecta (3連勝単式, Sanrensho Tanshiki), abbreviated as Sanrentan (3連単): The bettor must correctly pick the three runners which finish first, second, and third (Keiba, Keirin, Kyōtei and Auto Race).
 WIN 5 / Select 5: The bettor must pick the winners of five designated races. Betting on operators' website by PC or cellular phone only (Keiba with JRA or some local governments' operation only).
See also
References
de:Totalisator
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