Horse racing rules
When betting on horse racing, there are two rules which you need to be familiar with. Those two rules are Tattersall’s rule and Dead Heat rule. Tattersall’s rule applies when a horse is withdrawn from the race before start. Dead Head rule applies when two or more horses are deemed winners.
Horse arbs in RebelBetting are always between a regular bookmaker and an exchange. These rules generally doesn’t affect your arb since you back and lay the same horse.
Tattersall’s rule (Rule 4 c deductions)
When you place your bet, the odds displayed are based on all horses running in the race. If a horse is a non runner, i.e. not starting, the price will be revised for the remaining horses. Most bookmakers follow the same reduction table. The table can be found here
However, betting exchanges apply the reduction a bit different. While Rule 4 is normally applied on the winnings, exchanges applies the rule on total return.
Dead Heat rule
A term to denote a tie between two or, rarely, more runners in a race. If there is a Dead Heat, you will win part of your bet and lose part of your bet. This rarely occurs.