What to do when the odds move after your back bet

You have placed the bookmaker back bet. By the time you reach the exchange, the lay price has moved. The number in the calculator is now history, but the bookmaker bet is not. This is the moment to stop clicking and identify what the exchange has actually accepted.

There are three different cases: the lay was never submitted, it was submitted but remains fully unmatched, or part of it matched. The repair is different in each case. What does not change is the rule: work from accepted stakes and current odds, not the price you hoped to get.

The short answer

If the lay is not submitted, replace the planned lay odds with the current available price and calculate a fresh stake. If it is fully unmatched, cancel or amend that open order before placing another. If it is partially matched, cancel the unmatched remainder, record the accepted stake and odds, then use a partial-lay calculation for the top-up.

An exchange order must match before it stands. Smarkets says an order can remain unmatched or partially matched when there is too little liquidity at the requested price, and only the matched part of a partial order stands.[1] A submitted ticket is therefore not proof of cover.

Do not keep adding fresh lays while an old unmatched order is still live. That old order can match later, leaving you with more exchange exposure than you intended. Check the exchange's open-bets screen after every change.

First, name the state

The status matters more than the colour of the odds box. Open the bet details and note the matched stake, matched odds, unmatched stake and current liability. Smarkets identifies the matched amount in its bet view and says cancelling a partial order removes only the unmatched portion.[2]

State one: the lay was never submitted

This is the cleanest case. The bookmaker back is accepted, but there is no exchange order to unwind. Put the bookmaker stake and accepted back odds into the calculator, replace the old lay odds with the price now available, confirm the correct commission and calculate again.

Smarkets' matched-betting instructions tell users to enter the available lay odds and exchange commission, then review the required lay stake, liability and both outcome figures.[3] That is the useful comparison. A worse lay price may increase the qualifying loss, but the fresh calculation can still balance the two outcomes.

Check that enough money is available at the displayed price before confirming. If the top price has only a few pounds behind it, the full stake may spill into another price or remain partly unmatched. You can accept a larger known qualifying loss, choose another suitable selection if the offer still allows it, or stop before submitting the lay. The bookmaker bet already exists, so stopping here means accepting its unhedged risk rather than undoing it.

State two: the lay is fully unmatched

A fully unmatched order has accepted £0, but it may still be sitting in the market. It can match if the price comes back. Smarkets says only unmatched bets can be cancelled; once money has matched, that part cannot be cancelled.[1][2]

1. Open the exchange bet details and confirm the matched amount is £0.
2. Cancel the old order or amend it through the exchange's own control.
3. Refresh the open-bets view and confirm the old unmatched stake is gone.
4. Enter the current lay odds in the calculator and take the new stake and liability.
5. Submit once, then confirm the new order is fully matched.

Outplayed gives the same basic route for a completely unmatched lay: cancel it, enter the current price and recalculate the stake.[4] The verification step is what prevents the abandoned order from returning later and doubling the lay.

Do not type the old stake into a new price out of habit. A different lay price normally needs a different stake. Nor should you assume that clicking cancel has finished the job. Read the updated matched and unmatched figures.

State three: the lay is partially matched

This case needs a split calculation. Some exchange money already stands at the first odds. The rest does not. Smarkets states that cancelling a partially matched order cancels only its unmatched portion.[2] The accepted part stays in the market and belongs in the repair.

1. Cancel the unmatched remainder so it cannot fill after you place the top-up.
2. Record each accepted lay stake and its accepted odds. Use the execution details, not the requested total.
3. Enter the original bookmaker back, commission and every accepted lay into a calculator with partial-lay support.
4. Enter the current odds for the extra lay and use the calculated top-up stake.
5. Confirm the top-up is fully matched, then check the combined outcome figures.

Do not simply subtract the matched stake from the original planned stake. That subtraction tells you the old unmatched remainder. It does not tell you the stake needed at a new price.

Worked example after a price move

Suppose a £50 bookmaker back at 3.00 is accepted. The planned exchange lay was 3.10 with 2% commission. A balanced calculation gives a £48.70 lay stake, £102.27 liability and a loss of about £2.27 in either result.

Before any lay is submitted, the available price moves to 3.40. Recalculating at 3.40 gives a £44.38 lay stake and £106.51 liability. The balanced loss is now about £6.51 either way. The move costs roughly £4.24, but the new position is still measured and covered.

Now take the partial case. You submitted £48.70 at 3.10, but only £20 matched. After cancelling the £28.70 unmatched remainder, the calculator must preserve that accepted £20 lay at 3.10. At the new 3.40 price, the balancing top-up is about £26.15, not £28.70. The penny-rounded final outcomes are roughly a £4.76 loss if the selection wins and £4.77 if it loses.

These are Decimal-checked examples with penny rounding. A live calculator may allocate a penny differently, especially across several fills. Use your exchange's accepted figures and your actual commission.

Should you wait for the old price?

You can leave an unmatched order in the queue, but that is a decision to remain partly or wholly exposed while the bookmaker bet stands. The price may return. It may also move further away, the market may suspend, or the event may start before the order fills.

If you wait, set a firm review time well before the event and keep the open order visible. Never place a replacement without first dealing with the original. Outplayed notes that waiting offers no certainty about the direction of the next move and advises checking whether the bet has matched.[4]

Do not carry an accidental unmatched lay into play merely to recover a prettier qualifying loss. In-play delays, suspensions and fast price changes make the repair harder. If the event is close, a known loss at available pre-event odds is often easier to control than an open order and a hope.

A fail-closed repair checklist

1. Confirm the bookmaker back is accepted and record its stake, odds, selection and exact market.
2. Open the exchange bet details. Do not rely on the calculator tab.
3. Write down the matched stake, accepted odds, unmatched remainder and commission.
4. Cancel any unwanted unmatched remainder and verify that it has disappeared.
5. Recalculate from accepted amounts using the current available odds.
6. Check the new liability before submitting.
7. Place one repair order and wait for its fully matched confirmation.
8. Compare both final outcomes and update your record.

If the selection, market or settlement rules do not match, this workflow cannot make them equivalent. Check those details before adding money. For several fills at different prices, use a calculator that supports partial lays or seek help before the event rather than guessing.

RECALCULATE WITH OUTPLAYED ↗

Useful next guides

For price depth and several accepted fills, read the exchange liquidity and partial-match guide. The wrong-lay repair guide covers duplicate bets, wrong selections and incorrect calculator modes. If the event has started, use the stricter checks in the in-play matched betting guide. You can rebuild an untouched position in the free matched-betting calculator.