There is no public oddsmatcher for William Hill, so you'll need to find your own event following the steps below.
We assume you've already gone through a matched betting guide (using the automatcher) before starting this matched bet.
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Ideally you want to find a sporting event (I prefer football) which has the closest odds on both William Hill (the bet to back) and Smarkets (the lay bet). Stick to popular markets, such as Win-Draw-Win or Half-time Result.
Look on William Hill first then find the equivalent lay bet on Smarkets.
For this free bet offer, William Hill's terms state you must pick odds of 1.5 or greater. It's better to choose a bet with low odds for this step, between 1.5 and 4.00 if possible.
Finally, choose an event that's going to happen within the next 48 hours to save you waiting around later. But be careful about picking an event which is starting within 4 hours because odds will be fluctuating more, making things a bit trickier.
Once you've found a suitable match, submit the "Back odds" (from William Hill) and the "Lay odds" (from Smarkets) below. They must be decimals (eg. 3.50). The tool will then automatically do the calculations for you and update the next steps.