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What is Tattersalls rule 4? Sportsbook T&C


MarcoV

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Tattersalls Rule 4
B.6
1) In the event of one non-runner or one non-Participant, the odds on the remaining runners or remaining Participants are reduced in accordance with the so-called Tattersalls Rule 4. a. Win Betting:
Current odds of the withdrawn runner/Deductionsin percentage of net gain :
a. Win Betting:
1.30 and lower 75%
1.31 to 1.40 70%
1.41 to 1.53 65%
1.54 to 1.62 60%
1.63 to 1.80 55%
1.81 to 1.95 50%
1.96 to 2.20 45%
2.21 to 2.50 40%
2.51 to 2.75 35%
2.76 to 3.25 30%
3.26 to 4.00 25%
4.01 to 5.00 20%
5.01 to 6.50 15%
6.51 to 10.00 10%
10.01 to 15.00 5%
15.01 and higher No deductions made

b. Place Betting:
• Current odds of the withdrawn runner/Deductionsin percentage of net gain
1.06 and lower 55%
1.07 to 1.14 45%
1.15 to 1.25 40%
1.26 to 1.52 30%
1.53 to 1.85 25%
1.86 to 2.40 20%
2.41 to 3.15 15%
3.16 to 4.00 10%
4.01 to 5.00 5%
2) In the event of two or more non-runners or non-Participants, the total reduction shall not exceed 75%. The deduction in this case will be based on the aggregate odds of the withdrawn runners

This rule is for situations where a player withdraws from a tournament. Looking at all the numbers above might seem a bit confusing so let’s draw up an example:
Mark stakes €10 on Fabio Aru to win Tour de France to the odds of 16.
A week before the prologue Alberto Contador, one of the favourites to win, gets an injury which forces him to withdraw from the Tour. Since there’s now a favourite less, the chance of Aru to win obviously increases.
In this case we deduct 20% of the original winnings (odds of 16 on Aru) because the odds on Contador to win were at 4.50 - between 4.01 and 5.00 (see the list above).
Normally Mark would have earned €150 with a stake of €10 to the odds of 16 but the potential winnings after the injury will be deducted by 20% in net gain, which means Mark will win €30 less than before Contador’s injury. Mark ends up with a potential payout of €130 (€120 profit).

Why don’t you just pay out the original odds instead of deducting my potential winnings if a favourite withdraws from a tournament?
The main reason of Tattersall’s rule 4 is simply to remove this method of having an influence for the outcome. Especially in Horse Racing, there’s a risk of a participant withdrawing shortly before the race starts. Among other reasons it can happen if the conditions for the horse aren’t optimal (e.g. illness or injury). If you bet on a participant with a high odds and one of the favourites withdraws, suddenly you would have a great odds that doesn't match the probability of winning your bet. People who work within the business or somehow are affiliated with Horse Racing would have an advantage in this case, because they can abuse their position/insider knowledge to get a higher odds than they should have had in the first place.
The intention with this rule is to adjust the odds with the current the chance of winning a bet. We believe it’s fair for both our customers and Unibet, because the rule lowers the risk of people having an influence on the outcome.

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