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Rule 4 Deduction Formula:
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Rule 4 is a betting regulation that applies deductions to winning bets when a horse is withdrawn from a race after betting has commenced. The deduction percentage depends on the odds of the withdrawn horse at the time of withdrawal.
The calculator uses the Rule 4 deduction formula:
Where:
Explanation: The deduction is calculated based on the potential profit from the withdrawn horse's odds, reduced by the place fraction applicable to the bet type.
Details: Rule 4 deductions ensure fairness in betting by adjusting payouts when the field size changes after bets are placed. This protects both bookmakers and punters from significant disadvantages caused by late withdrawals.
Tips: Enter the decimal odds of the withdrawn horse, select the appropriate place fraction for your bet type, and input your original stake amount. The calculator will show both the deduction amount and your adjusted return.
Q1: When does Rule 4 apply?
A: Rule 4 applies when a horse is withdrawn from a race after betting markets have opened and before the race starts.
Q2: How are place fractions determined?
A: Place fractions vary by bookmaker and race type. Common fractions include 1/4 for 2-4 runners, 1/5 for 5-7 runners, and 1/4 odds for 8+ runners in most handicaps.
Q3: Do all bets get the same deduction?
A: No, deductions vary based on the odds of the withdrawn horse. Higher odds horses cause larger deductions when withdrawn.
Q4: Can Rule 4 be avoided?
A: Some bookmakers offer "Rule 4 free" promotions, but standard betting follows Rule 4 deductions for fairness.
Q5: How accurate is this calculator?
A: The calculator provides estimates based on standard Rule 4 calculations. Actual deductions may vary slightly between bookmakers.