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A Rule 4 deduction occurs when a horse is withdrawn from a race after you have placed your bet, but before the race begins. Because the withdrawn horse is no longer competing, the chances of the remaining horses winning increase. To account for this, bookmakers apply a percentage deduction to your winnings (not your original stake). The size of the deduction depends on the odds of the withdrawn horse at the time it was scratched—the shorter the odds of the non-runner, the larger the deduction (ranging from 5p to 90p for every £1 won). With the AceOdds bet calculator, you can automatically apply Rule 4 deductions to estimate your returns.

There is absolutely no difference! A Canadian and a Super Yankee are simply two different names for the exact same type of multiple bet. This bet consists of 26 individual wagers made across 5 different selections:

• 10 Doubles
• 10 Trebles
• 5 Four-folds
• 1 Five-fold accumulator

As it contains 26 bets, a £1 Super Yankee/Canadian will cost you £26 in total. You only need two of your five selections to win to guarantee a return.

The standard industry rule for a handicap race with 16 or more runners (like the Grand National) is paying out on the first 4 places at 1/4 of the winning odds. However, because the Grand National is the biggest betting event of the year, bookmakers compete by offering 'Extra Places'. Depending on the bookmaker, you will frequently see place terms extended to the first 5, 6, or even 7 horses. The odds for the place part of your bet are typically calculated at either 1/4 or 1/5 of the outright win odds. When using a bet calculator for the Grand National, make sure to adjust the 'Place Terms' and 'Fraction' settings on the AceOdds bet calculator to match the specific promotion.

If one of the selections in your accumulator (Acca) is postponed, cancelled, or deemed a "void" bet, your entire accumulator does not lose. Instead, that specific leg is simply removed from the bet, and your accumulator rolls over to the remaining selections. For example, if you place a 5-fold accumulator and one football match is postponed due to weather, your bet automatically becomes a 4-fold accumulator. Your potential payout will be recalculated based only on the odds of the four remaining active selections.

A Lucky 15 is one of the most popular 'full cover' bets, consisting of 15 separate bets across 4 selections: 4 singles, 6 doubles, 4 trebles, and 1 four-fold accumulator. Calculating a Lucky 15 manually is highly complex, especially if some horses win, some place, and others lose. The AceOdds bet calculator is essential here because it instantly computes your returns while factoring in complex variables like Each Way terms, Rule 4 deductions, dead heats, and the specific 'one winner bonuses' or 'all winner bonuses' that many bookmakers apply to Lucky 15s.

A dead heat occurs when two or more competitors finish an event tied for the same position, and they cannot be separated by a photo finish. When this happens, your original stake is divided by the number of competitors involved in the tie. For example, if you bet £10 on a horse to win at 8/1, and it finishes in a two-way dead heat for first place, your stake is halved to £5. That £5 is then multiplied by the full 8/1 odds, resulting in a £40 return (plus your £5 partial stake back). The AceOdds bet calculator handles this maths instantly - all you need to do is check the 'Dead Heat' box next to a winning selection.