Dutching Strategy: Partial Dutching vs Locking the Whole Field
- Dutching means staking several runners so any winner among them returns about the same amount.
- Partial dutching backs a shortlist of runners, so you lose your whole outlay if a runner you left out wins.
- A whole-field dutch only locks in a return at the prices shown when the best prices for every runner add up to less than 100%.
- Scratchings, deductions, price moves, stake limits and rounding can shrink or erase a thin margin, so check the field and recalculate before placing.
- Use only licensed Australian bookmakers, place every bet before the jump and keep records of each leg.
A dutching strategy spreads stakes across several runners so the return is the same whichever of them wins. That sounds tidy, but there are two very different versions. Most strategy pages teach partial dutching. You pick three or four runners on form and stake them so any of them pays the same. The risk stays, because a runner you left out can still win. The other version covers every runner in the field, using the best price at different licensed bookmakers. It only works when the combined book drops under 100%. This guide explains what dutching means and compares the two approaches with real-looking numbers. It also covers scratchings, deductions and field size.
- What is dutch betting, and what does dutching mean?
- What is a dutch bet in horse racing when you only back some runners?
- How does a whole-field dutching strategy lock in a return?
- What happens to a whole-field dutch when a runner is scratched?
- How does field size change your dutching strategy?
- What checklist should you run before placing a whole-field dutch?
What is dutch betting, and what does dutching mean?
Dutch betting means splitting one total stake across several selections in the same event so the payout is roughly equal whichever selection wins. The idea is simple. The maths is what matters.
In practice, dutching comes down to implied probability. Divide 100 by a decimal price and you get the share of the book that runner represents. A $4.00 runner is 25% and a $5.00 runner is 20%. Add up the selections you want to back and you know what fraction of your outlay is needed to return a set amount.
Stake each runner in proportion to its implied probability and every winning selection returns about the same. That's the whole mechanic. Strategies differ in which runners you include:
- Selection dutching backs a handful of runners you rate. You come out ahead if one of them wins and lose your whole outlay if any other runner wins.
- Whole-field dutching backs every runner. It only makes sense when the best available prices, taken across different bookmakers, add up to less than 100%.
The first is a betting opinion with a neater staking plan. The second is closer to arbitrage. The race result stops mattering, and the risks shift to execution: prices moving, stakes being limited, bets being voided and plain mistakes.
Keep that split in mind, because a lot of online advice blurs it.
What is a dutch bet in horse racing when you only back some runners?
Most dutching strategy pages teach the partial version. You study form, shortlist three runners and stake them to return the same amount. It's a valid way to bet, but it isn't a lock.
Take a six-runner race with these best prices:
- Runner 1: $2.60 (38.46%)
- Runner 2: $4.40 (22.73%)
- Runner 3: $6.50 (15.38%)
- Runner 4: $9.00 (11.11%)
- Runner 5: $15.00 (6.67%)
- Runner 6: $26.00 (3.85%)
Say you back the top three with $300. Their implied probabilities add to 76.57%, so the equal return is $300 ÷ 0.7657, about $391.80. The stakes come out at roughly $150.70, $89.05 and $60.25.
If any of those three wins, you collect about $391.80 and finish roughly $91.80 ahead. If Runner 4, 5 or 6 wins, you lose the full $300. On these prices, the market rates that as happening roughly one race in five.
That's the core issue. Partial dutching changes how your stake is spread. It doesn't change whether you can lose. Strike-rate claims attached to these systems describe past selections, not what happens in the next race. Over time, your result depends on whether your form judgement beats the margin built into the prices.
If you enjoy form study, partial dutching is a reasonable staking tool. Just recognise it for what it is: a bet on a group of runners, with your full outlay at risk every race.
How does a whole-field dutching strategy lock in a return?
A whole-field dutching strategy needs two things. You take the best price for every runner, usually spread across several licensed bookmakers, and those prices must add to less than 100%. In the example above they add to 98.20%, which leaves a 1.80% margin.
To spread $500, divide it by 0.982 for a target return of about $509.16. Then divide that target by each price:
- Runner 1 at $2.60: $195.83
- Runner 2 at $4.40: $115.72
- Runner 3 at $6.50: $78.33
- Runner 4 at $9.00: $56.57
- Runner 5 at $15.00: $33.94
- Runner 6 at $26.00: $19.58
Whichever runner wins, you get back about $509, roughly $9 more than you put in.
In practice you'll round the stakes. Using $196, $116, $78, $57, $34 and $20 (total $501), the lowest return is $507 if Runner 3 wins. The highest is $520 if Runner 6 wins. That locks in a return of at least $6 at the prices shown.
Margins this thin are normal. AUOdds data shows 3,147 locks across all covered markets in the last 30 days, with a typical lock of about 1.5%. A 1.5% margin on $500 is $7.50, so one wrong stake or a single price change can wipe it out.
The dutching calculator guide (/dutching-calculator-australia) explains the stake maths in more detail. The dutch betting horse racing guide (/dutch-betting-horse-racing-whole-field) covers the basics of backing a whole field.
What happens to a whole-field dutch when a runner is scratched?
Scratchings catch out a lot of new whole-field dutchers. A runner can be withdrawn after you've placed some or all of your bets, and fixed-odds racing has its own way of dealing with that.
Generally, a bet on the scratched runner is refunded. Winning fixed-odds bets on the remaining runners may have a deduction applied, sized according to the scratched runner's price. Each bookmaker sets out how it handles this in its terms, so read them rather than assume they all match.
Here's what that means for your lock:
- Your outlay drops by the refunded stake, but the return on every other runner can shrink by the deduction.
- Deductions can vary between bookmakers, and you've probably used several for the one race.
- Your margin was calculated on a field that no longer exists.
The result can move either way. Sometimes the refund and deductions roughly cancel out. Sometimes a lock worth $7 becomes a small loss. That's more likely when the scratched runner was short-priced and carried a large share of your outlay.
A few habits help:
- Check the final field and late scratchings before you start placing.
- Place the whole set close together so the field is less likely to change halfway through.
- Treat races with a runner reported as doubtful as higher risk, or skip them.
If a scratching lands partway through, stop. Recalculate on the new field before you place anything else.
How does field size change your dutching strategy?
Field size changes the work involved more than the maths.
Small fields (4 to 7 runners). Fewer legs mean fewer chances for a price to move before you finish. Stakes stay larger and are easy to place. The catch is that small fields can be priced tightly, so under-100% books may turn up less often.
Large fields (12 or more runners). More runners give a stray price more places to appear, so a large field can produce a lock. But you might need ten or more bets across several bookmakers, including a few dollars on a roughie at $51 or $101. Each extra leg is another chance for a price to drop, a bet to be rejected or a stake to be limited before you finish.
Rounding also hurts more in big fields. In a 14-runner race, rounding every stake to the nearest dollar can eat a 1% margin quickly. Rounding to the nearest 50 cents helps, where a bookmaker accepts it.
Speed matters at every field size. AUOdds tracks about 15,000 prices at any moment, refreshed roughly every 10 seconds. Even at that speed, a price can change between the alert and your bet.
A common approach is to place the leg most likely to move first. That's often an outsider priced well above the market at a single bookmaker. Then work back to the favourites, which often move less.
The dutching software guide (/dutching-software-whole-field-racing) looks at how tools find under-100% fields in the first place.
What checklist should you run before placing a whole-field dutch?
Before you place a whole-field dutch, run through this list:
- Every runner covered. Count your bets against the final field. One missing runner turns a lock into a partial dutch with real risk.
- Combined book under 100%. Add up 100 ÷ price for every runner, using prices you can actually get now, not ones from a minute ago.
- Licensed bookmakers only. Use operators licensed in Australia. ACMA has a page where you can check whether a gambling operator is legal [ACMA-LEGAL].
- Terms read. Know how each bookmaker handles scratchings, deductions and obvious pricing errors. Bets struck at an obvious-error price may be voided under their terms.
- Stakes rounded and rechecked. Work out the lowest return again after rounding.
- Account limits. A bookmaker may cap your stake on a runner, which leaves that leg short. Have a plan before you start.
- Records kept. Log each bet, price and result. For tax questions, the ATO's ruling IT 2655 covers how gambling and betting winnings are treated [ATO-IT2655]. Get advice for your own situation.
Place every bet before the jump. If you can't finish a dutch before the race starts, stop and reassess the position you already hold. Don't chase it.
A final reminder: betting is for adults 18 and over. If it stops feeling like a controlled hobby, help is available. BetStop, the National Self-Exclusion Register, lets you exclude yourself from licensed online and phone wagering providers [BETSTOP] [ACMA-BETSTOP]. Gambling Help Online offers free, confidential support.
Frequently asked questions
Is a dutching strategy the same as arbitrage betting?
Not always. Partial dutching backs a shortlist of runners, so your outlay is lost if an unbacked runner wins. That makes it a normal bet with a structured staking plan. Whole-field dutching across bookmakers, when the combined book is under 100%, works like arbitrage. It locks in a return at the prices shown, but it still carries execution risks such as price moves and voided bets.
What is a dutch bet in horse racing?
It's a set of win bets on several runners in the same race, with each stake sized so any winning runner returns about the same amount. You size the stakes by each runner's implied probability, which is 100 divided by its decimal price. The bet can cover a few runners or the whole field, and that choice decides how much risk remains.
Can a whole-field dutch still lose money?
Yes. A price can drop before you place a leg, a bookmaker can limit or reject a stake, or a bet can be voided under the bookmaker's terms. A late scratching with deductions can also shift the numbers, and a missed runner or a typing error can turn a thin margin into a loss. With typical margins around 1.5%, small errors matter.
How many bookmakers do I need for a whole-field dutch?
There's no fixed number. It depends on where the best price for each runner sits at the time. Sometimes two bookmakers cover the field, and sometimes it takes five or more. Having funded accounts with several licensed Australian bookmakers ready in advance makes it easier to place every leg quickly before the prices change.
Sources
- Check if a gambling operator is legal, Australian Communications and Media Authority
- Taxation Ruling IT 2655: gambling and betting winnings, Australian Taxation Office
- BetStop, Australian Government
- BetStop: the National Self-Exclusion Register, Australian Communications and Media Authority
More guides
18+ only. Betting involves risk, and prices and limits can change before you place a bet. If gambling isn't fun any more, Gambling Help Online (1800 858 858) is free and confidential, and BetStop lets you exclude yourself from every licensed Australian bookmaker.