So if you back Lucky Ned at 30, you might be offered lay odds on Betfair of 40 or 50. In particular, things can go wrong if you're tempted to back-and-lay longshots to 'make sure' you lose, as longshots are often only available at much longer prices on Betfair than they are at your bookmakers. This approach can often work but may prove expensive or back-fire entirely and get you shut down. Lucky Ned to win), (b) lay the same event off at Betfair (Lucky Ned not to win), then (c) hope that the event doesn’t happen (e.g. You therefore have to think about how to fake losses effectively, with the classic way of doing so being to (a) back an event at the bookies (e.g. It may seem like stating the obvious, but bookies don't like winners.