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Rule 4 Deductions Explained

Bet types & conceptsRule 4

Rule 4 is a deduction applied to winnings when a runner withdraws from a race after you bet. This guide explains it with hypothetical examples only.

Key takeaways
  • It is a deduction from winnings applied when a runner withdraws from a race after you bet, reflecting that the remaining runners' chances improved.
  • It depends on the withdrawn runner's odds — the shorter its price, the larger the deduction.
  • It applies to bets placed before the withdrawal at the affected price.

Why Rule 4 exists

If a horse or dog is withdrawn, the remaining runners' chances improve, so prices should have been shorter. Rule 4 adjusts winnings to reflect that.

How it is sized

The deduction depends on the withdrawn runner's odds: the shorter its price (the more likely it was), the bigger the deduction.

Example. If a strong favourite is withdrawn, a larger deduction applies to winnings on the others; an outsider's withdrawal causes little or no deduction.

When it applies

Rule 4 applies to bets placed before the withdrawal at the affected price. Bets taken after the market reforms are unaffected.

In practice

It is most common in horse racing and greyhound racing. The deduction is shown when your bet settles — read the rules.

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🔞 18+ only. Examples are hypothetical and for explanation only — they are not betting advice or real odds. Please gamble responsibly.

FAQ

What is a Rule 4 deduction?

It is a deduction from winnings applied when a runner withdraws from a race after you bet, reflecting that the remaining runners' chances improved.

How is a Rule 4 deduction calculated?

It depends on the withdrawn runner's odds — the shorter its price, the larger the deduction. An outsider's withdrawal causes little or none.

When does Rule 4 apply?

It applies to bets placed before the withdrawal at the affected price. Bets taken after the market reforms are unaffected.

How we made this guide. This guide is written and maintained by the 1xRoll Editorial Team and explains the general, widely-accepted rules of the market. All examples are hypothetical and illustrate mechanics only — they are not predictions, betting advice or real odds. Specific rules can vary by event and operator, so always check the in-game or in-bet-slip rules. editorial approach · responsible-gaming policy

Last updated: 2026-06-15

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