Bet365 are offering a matched, risk free in play bet on the Liverpool Swansea game tonight of up to £50. If you place a pre match bet, you can place an in play bet to the same value and if it loses, it will be refunded. There are a number of ways of guaranteeing profit here by betting against yourself. Eg you can bet pre match there will be over 0.5 goals in the game (a single goal) and then bet the £50 in play on 0-0 as soon as the game kicks off. You will profit a couple of pounds if there is a goal. If the games end 0-0 however, you could profit around £400. Alternatievly you can wait a while into the game to see if there is a goal. If there is and your pre match bet comes in (at odds of around 1/20) you effectively have a free £50 punt at whatever outcome you fancy.
8pm kick off - so you'll need to be available at around 8:01 to place the corresponding follow up bet.
The profit ONLY works if you bet the Liverpool/Win bet FIRST/PreMatch